CA1317538C - Rotary film sealing and severing head for thermoplastics - Google Patents

Rotary film sealing and severing head for thermoplastics

Info

Publication number
CA1317538C
CA1317538C CA000604199A CA604199A CA1317538C CA 1317538 C CA1317538 C CA 1317538C CA 000604199 A CA000604199 A CA 000604199A CA 604199 A CA604199 A CA 604199A CA 1317538 C CA1317538 C CA 1317538C
Authority
CA
Canada
Prior art keywords
film
anvil
clamping bars
rotational axis
thermoplastic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CA000604199A
Other languages
French (fr)
Inventor
Alan L. Rentmeester
John M. Pamperin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sasib Packaging North America Inc
Original Assignee
FMC Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US07/222,865 external-priority patent/US4840009A/en
Application filed by FMC Corp filed Critical FMC Corp
Application granted granted Critical
Publication of CA1317538C publication Critical patent/CA1317538C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/87—Auxiliary operations or devices
    • B29C66/874—Safety measures or devices
    • B29C66/8744—Preventing overheating of the parts to be joined, e.g. if the machine stops or slows down
    • B29C66/87443—Preventing overheating of the parts to be joined, e.g. if the machine stops or slows down by withdrawing the heating tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/24—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools characterised by the means for heating the tool
    • B29C65/30—Electrical means
    • B29C65/305—Electrical means involving the use of cartridge heaters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B29C65/743—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/003—Protecting areas of the parts to be joined from overheating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/004—Preventing sticking together, e.g. of some areas of the parts to be joined
    • B29C66/0042—Preventing sticking together, e.g. of some areas of the parts to be joined of the joining tool and the parts to be joined
    • B29C66/0044—Preventing sticking together, e.g. of some areas of the parts to be joined of the joining tool and the parts to be joined using a separating sheet, e.g. fixed on the joining tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/431—Joining the articles to themselves
    • B29C66/4312—Joining the articles to themselves for making flat seams in tubular or hollow articles, e.g. transversal seams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/432—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms
    • B29C66/4322—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms by joining a single sheet to itself
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8145—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/81457—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps comprising a block or layer of deformable material, e.g. sponge, foam, rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/816—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the mounting of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8161—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the mounting of the pressing elements, e.g. of the welding jaws or clamps said pressing elements being supported or backed-up by springs or by resilient material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/818—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8181—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects
    • B29C66/81815—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects of the clamps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8351—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws
    • B29C66/83511—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws jaws mounted on rollers, cylinders or drums
    • B29C66/83513—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws jaws mounted on rollers, cylinders or drums cooperating jaws mounted on rollers, cylinders or drums and moving in a closed path
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9121—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature
    • B29C66/91211—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods
    • B29C66/91212—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods involving measurement means being part of the welding jaws, e.g. integrated in the welding jaws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9121—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature
    • B29C66/91231—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature of the joining tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91421—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the joining tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10—Applying or generating heat or pressure or combinations thereof
    • B65B51/26—Devices specially adapted for producing transverse or longitudinal seams in webs or tubes
    • B65B51/30—Devices, e.g. jaws, for applying pressure and heat, e.g. for subdividing filled tubes
    • B65B51/306—Counter-rotating devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/812—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8122—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the composition of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/818—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8182—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the thermal insulating constructional aspects
    • B29C66/81821—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the thermal insulating constructional aspects of the welding jaws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/822—Transmission mechanisms
    • B29C66/8223—Worm or spindle mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/96—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process
    • B29C66/961—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process involving a feedback loop mechanism, e.g. comparison with a desired value

Abstract

ABSTRACT OF THE DISCLOSURE
A rotary film sealing and severing device for use with thermoplastic film for forming packages. The device includes a rotating anvil assembly and a counter-rotating film cutting assembly having a heated sealing and cutting knife. First and second liquid cooled clamping bars on either side of the knife hold the layers of film together while the film is being sealed and cut. Cooling the clamping bars prevents the film from adhering to the clamps and causes the layers of film to quickly fuse together and allows high speed operation by preventing separation of layers of film due to slow cooling.

Description

1 3 1 753~

ROTARY FILM SEALING AND SEVERING HEAD FOR
THERMOPLASTICS

BACKGROUND OF THE INVENTION
The present invention relates to horizontal 5 wrapping machines, and more particularly to a device for heat sealing and severing thermoplastic film used for forming packages in such machines.
A wrapping machine in which the present invention can be used is disclosed in U.S. Patent No.
10 4,712,357 issued to Crawford et al, December 15, 1987. The wrapping machine feed~ a succession of articles into a traveling tube of thermoplastic material which is sealed longitudinally and sealed and severed between the articles to produce individual 15 hermetically sealed packages.
SUMMARY OF THE INVENTION
The present invention discloses an improved heat sealing and severing device for use in packaging articles in tubular thermoplastic. The device 20 includes an anvil assembIy rotal:ably mounted about a first rotational axis and having a slick resilient anvil surface spaced apart from the first rotational axis. A film cutting assemb:Ly having a heated knife and a pair of hollow film clamps is rotatable about a 25 second rotational axis parallel with the first rotational axis. The film clamps are spaced apart and mounted parallel to the second rotational axis. The heated knife is mounted between the film clamps and parallel to the clamps~ The film cutting assembly and 30 the anvil assembly are synchronously rotated about their respective rotational axes so the film clamps and heated knife press against the anvil surface to seal and cut any thermoplastic on the anvil surface.
Sprin~s bias the film clamps away from the 131753~

second rotational axis so the film clamps press toward the anvil surface and contact the thermoplastic before the knife contacts the thermoplastic. This holds the thermoplastic securely while the kni~re performs the sealing and cutting action on the thermoplastic. Because the hot knife radiates heat to the film clamps a cooling liquid is circulated through the hollow film clamps to prevent the thermoplastic film from adhering to the clamps when sealing and cutting is done at a position close to the articles sealed in the thermoplastic. The cooled clamps also cool and set the film after sealing and cutting.
This provides smaller article packages because the clamps can be mounted closer to the hot knife, thus requiring a smaller amount of thermoplastic and a more secure seal. The cooler clamps allow the temperature of the hot knife to be increased, resulting in increased sealing and cutting speeds.
According to an aspect of the invention, a heat sealing and severing device for packaging articles in tubular thermoplastic, the device comprises:
multiple anvil assemblies rotatable about a first rotational axis and having resilient anvil surfaces spaced from the first rotational axis;
film cutting assemblies rotatable about a second rotational axis parallel with the first rotational axis;
a pair of hollow clamping bars mounted on each of the cutting assemblies with the bars being spaced apart and with each of the bars being parallel with the second rotational axis;
a heatable knife mounted on each of the cutting assemblies with each of the knives mounted between the clamping bars with the knives parallel to the clamping bars and spaced apart from the clamping bars, the knives each having a knife edge which is directed away from the second rotational axis;

'~
r'~

131753~3 2a means for synchronously rotating the film cutting assemblies and the anvil assemblies to cause the clamping bars and the knife edges to contact the resilient anvil surfaces as the anvil assemblies and the film cutting assemblies rotate into a predetermined position about the first and the second axes; and means for providing a cooling liquid to each of the hollow clamping bars.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a perspective of a horizontal wrapping machine incorporating the rotary film sealing and severing device of the present invention.
~5 Figure 2 is a front elevation of the rotary film sealing and severing device of the present invention.
Figure 3 is a sectional view taken along line 3 - 3 of Figure 2.
Figure 4 is a sectional view taken along line 4 - 4 of Figure 2.
Figure 5 is a sectional view similar to Figure 3.
Figure 6 is a sectional view taken along line 6 - 6 of Figure 2.
Figure 7 is a sectional view taken along line 131753~

7 - 7 of Figure 2, Figure 8 is a sectional view of an alternative embodimant of the invention wherein multiple film sealing and severing devices are S incorporated.
DESCRIPTION OF THE PREFERRED_EMBODIMENT
A horizontal wrapping machine 10 in which the present invention can be used is shown in Figure 1.
Wrapping machine 10 includes a movable chain 11 for 10 transporting a plurality of articles 12 to be wrapped in thermoplastic film 16 supplied from a pair of rolls 17a, 17b mounted on a pair o support shafts 18a, 18b. Fi'm 16 is threaded over a plurality of rollers 22 and is engaged by forming device 23 which forms the 15 sheet of film into a tube 24 surrounding articles 12.
The tube ~4 and the enclosed articles advance to a sealing and severing device 28 where it passes between a film cutting assembly 29 and an anvil assembly 30, The individual articles 12 are sealed inside film 16 20 and film 16 is sealed and severed between articles by device 28 to produce individually wrapped articles.
Electronic control circuitry (not: shown) for operating wrapping machine 10 is mounted in a control cabinet 34, The anvil assembly 31) (Figs. 2 - 6) includes 25 a irst ro~ational axis or shat 35 rota~ably mounted in a pair of b~arings 36 connected to a pair of end plates 37. An anvil 41 is secured to shaft 35 by a plurality ~f bolts 42. Anvil 41 includes a block 43 having a slot 44 with a soft rubber pad 48 and a hard 30 rubber pad 49 (Fig. 6) mounted in slot 44. A low friction tape 50, such as fiberglass reinforced Teflon type, covers pad 49 to allow the heated thermoplastic film to slide easily over a surface 50a of anvil 41.
The film cutting assembly 29 (Figs. 2 - 7) includes a second ro~ational axis or shaft 54 1 31 753~

rotatably mounted in a pair of bearings 55 connected to the end plates 37. End plates 37 are connected to a portion 56 of wrapping machine lO by a plurality o~
bolts 60 ~Fig. 2) which are used to adjust the 5 position of device 28 relative to the height of article 12. A mounting block 61a (Figs~ 2 - 5) connected to shaft 54 by a plurality of bolts 62 is pivotally connected to a plurality of film retaining arms 63a, S3b by a plurality o pivot pins 66a, 66b lO and a plurality of reaction pins 67a, 67b (Figs. 2 -7). Each pin 66a, 66b is pivotally mounted in mounting block 61a and each pin 67a, 67b is slidably mounted in a groove 68 in mounting block 61a.
Mounting block 61a, as best seen in Figures 3, 4 15 includes a pair of bores 72a, 72b each having a pair of adjustable screws 73, 74 and a spring 75 mounted in the bore. Spring 75 is mounted between screw 73 and reaction pin 67b to bias retaining arm 63b in a counterclockwise direction about: pivot pin 66b and to 20 bias retaining arm 63a in a c:lockwise direction about pivot pin 66aO Adjustable screws 74 limit the amount of downward movement of pins 67a, 67b (~ig. 4) to limit the position of retaining arms 63a 63b.
A heated sealing bar 79 tFigs~ 2 - 6) is 25 connected to a heat insulating spacer 80 by a plurality of bolts 81 and spacer 80 i~ connected to shaft 54 by a plurality of bolts 82. A heater 86 and a temperature sensor 87 regulate the temperature of sealing bar 79. A pair of hollow liquid cooled film clamps 88a, 88b are spaced mounted on either side of sealing bar 79 and secured to film retaining arms 63a, 63b (Figs. 2 - 7). ~ cooling liquid is piped to film clamps 88a, 88b through a central bore 99 in shaft 54 (Figs. 2 - 7). A pair of pipes 93a, 93b and passages 94a, 94b supply cooling liquid to hollow film clamps 1 31 7~3~3 88a, 88b respectively. The liquid flows through clamps 83a r 88b to a passage (not shown) in mounting block 63d (~ig. 2~, through a tube 98b and out of a bore 99 in shaft 54 to a pipe (not shown) for carrying 5 the liquid from shaft 54 to a radiator or other cooling means. The liquid is then cooled and returned through bore 99 to the film clamps 88a, 88b.
A pair of gears lOOa, lOOb (Fig. 2) cause shafts 35 and 54 to rotate in opposite directions as 10 shown by a pair of arrows lOla~ lOlb (~igs. 3 - 53.
As shafts 35, 54 rotate into the position shown in ~igure 5, film clamps 88a, 88b press against tape 50 and against the film 16 (Fig. 1) between tape 50 and clamps 88a, 88b to clamp the moving ~ilm. As shafts 15 35~ 54 rotate into the position shown in Figures 3, 6 the heated sealing bar 79 presses against film 16 causing layers of the film to fuse together on either side of bar 79 and cutting the film into two sections. The shats 35, 54 con~inue to rotate toward 20 the position shown in Figure 4 with the anvil 41 moved away from sealing bar 79 and film clamps 88a, 88b . At this time the thermoplastic tube 24 and the enclosed articles 12 (Fig. 1) advance through the area between shafts 35~ 54 toward the right end of wrapping machine 25 10.
The cooled clamping bars prevent the fil from adhering to the clamps and cause the fused layers of film to cool so the layers adhere together when the clamping bars are removed from a position against the 30 thermoplastic film.
Figure 8 provides a representation of an alternative embodiment of the invention. In the presented embodiment a plurality of anvil assemblies and a plurality of film cutting assemblies are 35 provided. Two of each have been shown in Figure 8.

1 31 753~

This alternative embodiment is operatively similar to the preferred embodiment shown in Figures 1 through 7 with the improved abilit~ to handle smaller lengths o~ film to enclose articles that are shorter than the articles processed by the apparatus of the preferred embodiment. It has been found that, when processing short articles with the preferred embodiment, film speed through the wrapping machine is not optimized. However, by using multiple anvils and multiple film cutting assemblies, two of each in this embodiment, film speed through the wrapping machine and the wrapping machine itself can be increased so as to yield higher through-put of articles through the wrapping machine.
The same reference numerals are used to identify identical components in the ~second~
embodiment shown in Figure 8.
Although the best mode contemplated for carrying out the present invention has been herein shown and described, it will be apparent that modification and variation may be made without departing rom what is regarded to be the subject matter of the invention.
LBG:smb

Claims (5)

1. A heat sealing and severing device for packaging articles in tubular thermoplastic, said device comprising:
multiple anvil assemblies rotatable about a first rotational axis and having resilient anvil surfaces spaced from said first rotational axis;
film cutting assemblies rotatable about a second rotational axis parallel with said first rotational axis;
a pair of hollow clamping bars mounted on each of said cutting assemblies with said bars being spaced apart and with each of said bars being parallel with said second rotational axis;
a heatable knife mounted on each of said cutting assemblies with each of said knives mounted between said clamping bars with said knives parallel to said clamping bars and spaced apart from said clamping bars, said knives each having a knife edge which is directed away from said second rotational axis means for synchronously rotating said film cutting assemblies and said anvil assemblies to cause said clamping bars and said knife edges to contact said resilient anvil surfaces as said anvil assemblies and said film cutting assemblies rotate into a predetermined position about said first and said second axes; and means for providing a cooling liquid to each of said hollow clamping bars.
2. A heat sealing and serving device as defined in claim 1 including spring means for biasing said clamping bars away from said second rotational axis causing said clamping bars to contact said anvil surface before said knife edge contacts said anvil surface as said anvil surface is rotated into a position nearest to said film cutting assembly.
3. A heat sealing and severing device as defined in claim 1 including a slick anvil surface to facilitate movement of said thermoplastic across said anvil surface.
4. A heat sealing and severing device as defined in claim 1 including means for heating said knife to seal portions of overlapped thermoplastic with said thermoplastic between said anvil assembly and said film cutting assembly, and to sever a portion of the thermoplastic which contains one article from an adjacent portion of the thermoplastic which contains another article.
5. A heat sealing and severing device as defined in claim 4 including spring means for biasing said clamping bars away from said second rotational axis causing said clamping bars to contact said anvil surface before said knife edge contacts said anvil surface as said anvil assembly is rotated into a position nearest to said film cutting assembly.
CA000604199A 1988-07-22 1989-06-28 Rotary film sealing and severing head for thermoplastics Expired - Fee Related CA1317538C (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US07/222,865 1988-07-22
US07/222,865 US4840009A (en) 1988-07-22 1988-07-22 Rotary film sealing and severing head for thermoplastics
US07/293,267 US4909016A (en) 1988-07-22 1989-01-04 Rotary film sealing and severing head for thermoplastics
US07/293,267 1989-01-04

Publications (1)

Publication Number Publication Date
CA1317538C true CA1317538C (en) 1993-05-11

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US (1) US4909016A (en)
JP (1) JPH0272026A (en)
CA (1) CA1317538C (en)
DE (1) DE3920867A1 (en)
ES (1) ES2014818A6 (en)
FR (1) FR2634415A1 (en)
GB (1) GB2221868A (en)
IT (1) IT8921057A0 (en)
NL (1) NL8901622A (en)
NZ (1) NZ229156A (en)
SE (1) SE8901899L (en)

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Publication number Publication date
FR2634415A1 (en) 1990-01-26
SE8901899D0 (en) 1989-05-26
GB8914307D0 (en) 1989-08-09
NZ229156A (en) 1991-01-29
JPH0272026A (en) 1990-03-12
US4909016A (en) 1990-03-20
DE3920867A1 (en) 1990-01-25
IT8921057A0 (en) 1989-06-30
ES2014818A6 (en) 1990-07-16
NL8901622A (en) 1990-02-16
SE8901899L (en) 1990-01-23
GB2221868A (en) 1990-02-21

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