US3640668A - Reentrant forming apparatus - Google Patents
Reentrant forming apparatus Download PDFInfo
- Publication number
- US3640668A US3640668A US844305A US3640668DA US3640668A US 3640668 A US3640668 A US 3640668A US 844305 A US844305 A US 844305A US 3640668D A US3640668D A US 3640668DA US 3640668 A US3640668 A US 3640668A
- Authority
- US
- United States
- Prior art keywords
- reentrant
- dies
- punches
- forming
- punch
- 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 - Lifetime
Links
Images
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
- B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
- B29C67/0048—Local deformation of formed objects
-
- 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
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/08—Deep drawing or matched-mould forming, i.e. using mechanical means only
- B29C51/082—Deep drawing or matched-mould forming, i.e. using mechanical means only by shaping between complementary mould parts
-
- 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
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/30—Moulds
-
- 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
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/30—Moulds
- B29C51/32—Moulds having cutting means
-
- 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
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/30—Moulds
- B29C51/34—Moulds for undercut articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2025/00—Use of polymers of vinyl-aromatic compounds or derivatives thereof as moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/712—Containers; Packaging elements or accessories, Packages
- B29L2031/7162—Boxes, cartons, cases
- B29L2031/7168—Egg-cartons
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S425/00—Plastic article or earthenware shaping or treating: apparatus
- Y10S425/058—Undercut
Definitions
- a portion of the plastic protruding from the dies is engaged on opposite sides by cooperating punches to impart a reentrant fon'nation to the plastic that the dies alone could not impart.
- the reentrant formation facilitates releasably latching the top and bottom portions of the completed carton in a closed position.
- This invention relates to the formation of materials into a desired shape and, more particularly, to novel and highly effective apparatus facilitating the forming of a material in a case where it is desired to impart a reentrant formation to the material which cannot be imparted, for example, by the simple act of bringing together a pair of dies on opposite sides of the material to be formed.
- An object of the present invention is to provide apparatus facilitating the production of a superior carton that is extremely inexpensive and that includes reentrant portions facilitating latching of the carton in a closed position.
- FIGS. 1-3 are end elevational views, partly in section, of a representative embodiment of apparatus constructed in accordance with the invention in three successive stages of its operation;
- FIG. 4 is a fragmentary side elevational view of the apparatus of FIGS. 1-3.
- FIG. 5 is an end elevational view, partly broken away, of a carton produced by the apparatus of the invention.
- FIGS. 1-4 show apparatus constructed in accordance with the invention.
- the apparatus 10 comprises a pair of dies 12 and 14 mounted for relative movement with respect to each other as shown by a double-headed arrow 16 between an open position facilitating accommodation therebetween of a formable material, as shown in FIG. 1, and a closed position, as shown in FIGS. 2 and 3, facilitating forming of the material 18 at a forming station 20 to a predetermined shape, including a protruding portion 22 shown in FIG. 2.
- Additional forming means 24 is provided operatively as sociated with the dies 12 and 14.
- Motive means for the additional forming means 24 includes spur gears 26 and 27 and shafts 28 and 29, respectively, driven by the spur gears 26 and 27 for bringing the additional forming means 24 into cooperation with the material, as shown in FIG. 3, for further forming the material to a desired shape.
- the additional forming means 24 comprises punch means and, more particularly, at least one punch 30 and another punch 32 mounted at the station 20.
- the punches 30 and 32 are keyed by keys 42 and 44, respectively, to the shafts 28 and 29 on which the punches 30 and 32 are respectively mounted.
- the shafts 28 and 29 can be parallel to each other so that the depth of the reentrant formations does not vary as a function of distance along the length of the completed carton or can be canted with respect to each other so that the reentrant formations are deeper at one end of the carton that at the other end.
- the latter embodiment provides a zipper effect" facilitating opening and closing of the carton.
- the punches 30 and 32 are mounted in spaced-apart relation to each other, and they have respectively forming portions 34 and 36 and are paired for cooperation with each other.
- the motive means including the spur gear 26 and shaft 28 for operating the lower punch 30 and the spur gear 27 and shaft 29 for operating the punch 32 is adapted to move the punches 30 and 32 pivotally between a retracted position as shown in FIG. 2 facilitating accommodation of the formable material 18 between the forming portions 34 and 36 and an advanced position as shown in FIG. 3 in which the forming portions 34 and 36 engage the portion 22 of the material 18, the forming portions 34 and 36 being in vertically offset relation to each other.
- a counterpunch portion 38 on the punch 30 opposes the forming portion 36 on the punch 32, and, likewise, a counterpunch portion 40 on the punch 32 opposes the forming portion 34 of the punch 30.
- the reentrant formation generally designated 46 thus formed includes an upper reentrant portion (as seen in FIG. 3) 48 and a lower reentrant portion 50.
- the portions 48 and 50 are both reentrant in the sense that they could not have been made by the dies 12 and 14, which move, as noted above, in the direction indicated by the arrow 16 in coming together on opposite sides of the material 18.
- the forming portions of the respective punches 30, 32 may be arranged, if desired, to produce one or more holes in the material 18.
- the formed cartons need not be passed to a separate station for the formation of reentrant portions.
- the latter may be desirable, and it is within the scope of the invention to form the reentrant portions at a separate station by means of the novel forming apparatus 24.
- reentrant formations have important advantages in the manufacture of cartons, such as for eggs and the like, out of foamed polystyrene and the like, for such construction is far better able to resist accidental opening of the cartons during stacking and so forth.
- the fonnable material 18 is formed into a top 52 and a bottom portion 54, by the principal forming means l2, l4 and the portions 52 and 54 can be brought together and latched in a closed position by latch means including the reentrant portions 48 and 50 provided by the additional forming means 24.
- the principles of the invention are applicable, of course, regardless of the precise nature of the formation imparted by the main forming means and the latter may be used to form carton trays or lids, only, rather than complete cartons.
- the formable material 18 can be expandable polystyrene foam, biaxially oriented polystyrene sheet material, high-impact polystyrene, a multipolymer, polypropylene, polyethylene, ABS, a laminated construction or other thermoplastic material.
- egg cartons, cottage cheese containers, margarine tubs, etc. may be manufactured more efficiently, quickly, and economically than has heretofore been possible.
- gripping members for gripping and advancing the material through a machine that performs other steps in addition to the forming steps.
- preheating may be efiected in order to facilitate thennoforrning, and also printing and the usual trimming and the blanking may be effected in order to produce a neat and commercially desirable finished product.
- the means effecting the reentrant formations need not move pivotally; such means can be made to execute other kinds of movement, including rectilinear or curvilinear reciprocating movement.
- the forming portions of the punches 30, 32 may be located at various positions along their lengths, dependent upon where the desired formation is to be produced in the carton. This may be adjacent the edge or substantially inwardly thereof.
- the invention is to be construed as including all of the embodiments thereof within the scope of the appended claims.
- said reentrant forming means comprises a pair of cooperating punches and means mounting said punches for relative movement with respect to each other, the relative movement of said punches with respect to each other being different from the relative movement of said dies with respect to each other and each punch having a protruding forming portion and a recessed counterpunch, the forming portion of each punch cooperating with the counterpunch of the other punch.
- said reentrant forming means comprises a pair of cooperating punches and drive means for moving said punches towards each other, each punch having a protruding forming portion and a recessed counterpunch, the forming portion of each punch cooperating with the counterpunch of the other punch, and said punches being respectively movable towards each other by said drive means in a direction different from the direction of relative movement of said dies towards each other to impart a double reentrant formation to material inserted therebetween.
- said drive means includes a pair of rotatable shafts and wherein each of said pair of punches is mounted for rotation on a different one of said shafts, whereby said punches are pivoted upon rotation of said shafts to impart said double reentrant formation to said material.
Abstract
Description
Claims (4)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US84430569A | 1969-07-24 | 1969-07-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3640668A true US3640668A (en) | 1972-02-08 |
Family
ID=25292342
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US844305A Expired - Lifetime US3640668A (en) | 1969-07-24 | 1969-07-24 | Reentrant forming apparatus |
Country Status (1)
Country | Link |
---|---|
US (1) | US3640668A (en) |
Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3917770A (en) * | 1973-11-07 | 1975-11-04 | Mobil Oil Corp | Method of thermoforming thermoplastic foam material |
US3923948A (en) * | 1971-09-21 | 1975-12-02 | Mobil Oil Corp | Thermoforming plastic articles |
US3950208A (en) * | 1973-08-17 | 1976-04-13 | Borden, Inc. | Method of making egg cartons |
US4030870A (en) * | 1974-02-21 | 1977-06-21 | Kelvinator, Inc. | Refrigerator construction and the manufacture of panels therefor |
US4053549A (en) * | 1975-01-06 | 1977-10-11 | Mobil Oil Corporation | Method of embossing foam polystyrene to prevent warping upon removal from mold |
US4143111A (en) * | 1975-04-24 | 1979-03-06 | Irwin Jere F | Method of matched-mold forming from a hot sheet of polystyrene foam, an open vessel having an outward sloping flat side wall with at least one hole in said side wall |
US4304747A (en) * | 1976-12-06 | 1981-12-08 | S. Eisenberg & Company, Division Of Creative Industries, Inc. | Method of heat-trimming foam material |
US4419068A (en) * | 1981-02-17 | 1983-12-06 | Dolco Packaging Corporation | Molding apparatus having a vented female mold member for forming foamed egg cartons |
US4446088A (en) * | 1981-09-08 | 1984-05-01 | Mobil Oil Corporation | Method and mold for making an improved egg carton |
US4495135A (en) * | 1982-08-09 | 1985-01-22 | Baxter Travenol Laboratories, Inc. | Method for forming container having re-entrant flange |
US4778439A (en) * | 1987-06-18 | 1988-10-18 | Peerless Machine & Tool Corporation | Apparatus and method for forming a clamshell assembly |
US5156277A (en) * | 1990-05-04 | 1992-10-20 | Gunter Witz Ag | Package for consumer goods susceptible to shock |
EP0706452A1 (en) * | 1993-06-22 | 1996-04-17 | The Dow Chemical Company | Polystyrene foam sheet and process of making same |
WO1996040484A1 (en) * | 1995-06-07 | 1996-12-19 | Samsonite Corporation | Apparatus for differential pressure forming plastic sheets |
US5593700A (en) * | 1994-04-05 | 1997-01-14 | Stilgenbauer; Guenter | Folding apparatus and folding method |
US5894007A (en) * | 1995-06-07 | 1999-04-13 | Samsonite Corporation | Differential pressure formed luggage with molded integrated frame |
US20130090223A1 (en) * | 2010-06-18 | 2013-04-11 | Sidel Participations | Tool-holder module for shaping at least one cardboard cut-out |
US10308396B2 (en) * | 2013-03-15 | 2019-06-04 | Jay Baker | Method of producing a packaging container with a closure and release mechanism |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US910257A (en) * | 1908-01-31 | 1909-01-19 | John P Wright | Die for shaping composition plates. |
US1420808A (en) * | 1918-11-07 | 1922-06-27 | Charles S Batdorf | Machine for making paper cups |
US3321562A (en) * | 1964-05-08 | 1967-05-23 | Illinois Tool Works | Method and apparatus for forming enlarged container rim |
-
1969
- 1969-07-24 US US844305A patent/US3640668A/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US910257A (en) * | 1908-01-31 | 1909-01-19 | John P Wright | Die for shaping composition plates. |
US1420808A (en) * | 1918-11-07 | 1922-06-27 | Charles S Batdorf | Machine for making paper cups |
US3321562A (en) * | 1964-05-08 | 1967-05-23 | Illinois Tool Works | Method and apparatus for forming enlarged container rim |
Cited By (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3923948A (en) * | 1971-09-21 | 1975-12-02 | Mobil Oil Corp | Thermoforming plastic articles |
US3950208A (en) * | 1973-08-17 | 1976-04-13 | Borden, Inc. | Method of making egg cartons |
US3917770A (en) * | 1973-11-07 | 1975-11-04 | Mobil Oil Corp | Method of thermoforming thermoplastic foam material |
US4030870A (en) * | 1974-02-21 | 1977-06-21 | Kelvinator, Inc. | Refrigerator construction and the manufacture of panels therefor |
US4053549A (en) * | 1975-01-06 | 1977-10-11 | Mobil Oil Corporation | Method of embossing foam polystyrene to prevent warping upon removal from mold |
US4143111A (en) * | 1975-04-24 | 1979-03-06 | Irwin Jere F | Method of matched-mold forming from a hot sheet of polystyrene foam, an open vessel having an outward sloping flat side wall with at least one hole in said side wall |
US4304747A (en) * | 1976-12-06 | 1981-12-08 | S. Eisenberg & Company, Division Of Creative Industries, Inc. | Method of heat-trimming foam material |
US4419068A (en) * | 1981-02-17 | 1983-12-06 | Dolco Packaging Corporation | Molding apparatus having a vented female mold member for forming foamed egg cartons |
US4446088A (en) * | 1981-09-08 | 1984-05-01 | Mobil Oil Corporation | Method and mold for making an improved egg carton |
US4495135A (en) * | 1982-08-09 | 1985-01-22 | Baxter Travenol Laboratories, Inc. | Method for forming container having re-entrant flange |
US4778439A (en) * | 1987-06-18 | 1988-10-18 | Peerless Machine & Tool Corporation | Apparatus and method for forming a clamshell assembly |
EP0295928B1 (en) * | 1987-06-18 | 1991-10-09 | Peerless Machine & Tool Corporation | Apparatus for forming a clamshell assembly |
US5156277A (en) * | 1990-05-04 | 1992-10-20 | Gunter Witz Ag | Package for consumer goods susceptible to shock |
EP0706452A1 (en) * | 1993-06-22 | 1996-04-17 | The Dow Chemical Company | Polystyrene foam sheet and process of making same |
EP0706452A4 (en) * | 1993-06-22 | 1997-03-05 | Dow Chemical Co | Polystyrene foam sheet and process of making same |
US5593700A (en) * | 1994-04-05 | 1997-01-14 | Stilgenbauer; Guenter | Folding apparatus and folding method |
WO1996040484A1 (en) * | 1995-06-07 | 1996-12-19 | Samsonite Corporation | Apparatus for differential pressure forming plastic sheets |
US5637330A (en) * | 1995-06-07 | 1997-06-10 | Samsonite Corporation | Apparatus for differential pressure forming shells for hard sided luggage containers |
US5894007A (en) * | 1995-06-07 | 1999-04-13 | Samsonite Corporation | Differential pressure formed luggage with molded integrated frame |
US20130090223A1 (en) * | 2010-06-18 | 2013-04-11 | Sidel Participations | Tool-holder module for shaping at least one cardboard cut-out |
US10308396B2 (en) * | 2013-03-15 | 2019-06-04 | Jay Baker | Method of producing a packaging container with a closure and release mechanism |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3640668A (en) | Reentrant forming apparatus | |
US4155692A (en) | Shear molding of reinforced latch | |
EP0295928B1 (en) | Apparatus for forming a clamshell assembly | |
US3900550A (en) | Method of enhancing flexure of plastic hinges | |
CA2153535A1 (en) | Process for Making a Trapezoidally-Shaped Opening in a Thermoformed Sheet Material | |
US4104349A (en) | Method of making a perforated, molded container | |
DE2327286A1 (en) | PACKAGING DEVICE | |
US10308396B2 (en) | Method of producing a packaging container with a closure and release mechanism | |
DE1561550A1 (en) | Container element, pack, and form and method for manufacturing the container element | |
US3785762A (en) | Universal thermoplastic sheet forming apparatus | |
DE2462125C3 (en) | Device for manufacturing packaging containers | |
US3577495A (en) | Egg carton forming method | |
US3845187A (en) | Method of molding a latch opening | |
US4789129A (en) | Adjustable mold for forming containers | |
KR101164190B1 (en) | The Cutting Apparatus Of Film | |
US4143111A (en) | Method of matched-mold forming from a hot sheet of polystyrene foam, an open vessel having an outward sloping flat side wall with at least one hole in said side wall | |
EP1989037B1 (en) | Apparatus and method for thermoforming containers from plastic foils | |
US4142848A (en) | Apparatus for manufacturing a lockable carton | |
IE38866B1 (en) | Improvements in and relating to apparatus for producing containers | |
GB1468121A (en) | Process and apparatus for forming a tearably detachable portion on a sheet | |
IL36175A (en) | A process of manufacturing open or closed packagings of foam plastics,preferably foam polystyrene | |
EP1910181B1 (en) | Method and device for manufacturing a packaging comprising a postformed form-fitting connection | |
US3594464A (en) | Method for scoring synthetic plastic sheet material | |
ES8406935A1 (en) | Process and apparatus for producing plastics articles interconnected by easily breakable seams by way of thermoforming. | |
US3190943A (en) | Method of producing carton liners and partitions |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: PI, INC., PACKAGING INDUSTIES GROUP, INC., PI CORP Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:PHILADELPHIA NATIONAL BANK;REEL/FRAME:004449/0188 Effective date: 19850322 |
|
AS | Assignment |
Owner name: PACKAGING INDUSTRIES GROUP, INC., A DE. CORP., MAS Free format text: LICENSE;ASSIGNOR:MARINE MIDLAND BUSINESS LOANS, INC.;REEL/FRAME:004661/0978 Effective date: 19860929 Owner name: MARINE MIDLAND BUSINESS LOANS, INC., A CORP., MASS Free format text: SECURITY INTEREST;ASSIGNOR:PACKAGING INDUSTRIES GROUP, INC.;REEL/FRAME:004661/0972 Effective date: 19860929 Owner name: PACKAGING INDUSTRIES GROUP, INC., 130 NORTH STREET Free format text: LICENSE;ASSIGNOR:MARINE MIDLAND BUSINESS LOANS, INC.;REEL/FRAME:004661/0978 Effective date: 19860929 Owner name: MARINE MIDLAND BUSINESS LOANS, INC., 60 HICKORY DR Free format text: SECURITY INTEREST;ASSIGNOR:PACKAGING INDUSTRIES GROUP, INC.;REEL/FRAME:004661/0972 Effective date: 19860929 |