Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS3670880 A
Publication typeGrant
Publication dateJun 20, 1972
Filing dateAug 7, 1970
Priority dateAug 7, 1970
Publication numberUS 3670880 A, US 3670880A, US-A-3670880, US3670880 A, US3670880A
InventorsBurleson E Richard, Davis Carl H
Original AssigneeDresser Ind
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Package for flexible products
US 3670880 A
Abstract
This disclosure relates to a package construction adapted for vertical stacking and shipment in which a flexible product is enclosed within a paperboard receptacle, and a paperboard cover is disposed atop the flexible product in such a fashion that the cover rests on the product and telescopes over the receptacle such that other package constructions disposed thereabove bear upon the flexible product and not the paperboard container. The package construction contains a plastic film on its outer surfaces which is shrunk wrapped thereover and is fused thereto, thereby providing weather resistant protection for the contents thereof.
Images(1)
Previous page
Next page
Description  (OCR text may contain errors)

United States Patent Burleson et a].

[451 June 20, 1972 PACKAGE FOR FLEXIBLE PRODUCTS Inventors: E. Richard Burleson, Reseda, Califi; Carl H. Davis, Seattle, Wash.

Dresser Industries, lnc., Dallas, Tex.

Aug. 7, 1970 Assignee:

Filed:

Appl. No.:

US. Cl. ..206/65 S, 206/835, 229/DIG. 12, 53/30 Int. Cl. 865d 71/00, 865d 85/62 Field of Search ..206/65 R, 65 S, 65 B, 45.33, 206/835; 53/30; 229/3.l, DIG. 12

References Cited UNITED STATES PATENTS 5/1963 Fallert ..206/65 R 6/196] Tench et a]. ..229/3.l

3,508,375 4/1970 Myers ..206/45 .33

Primary Examiner-William T. Dixson, Jr.

Attorney-Robert W. Mayer, Thomas P. Hubbard, Jr., Daniel Rubin, Raymond T. Majesko, Roy L. Van Winkle, William E. Johnson, Jr. and Eddie E. Scott ABSTRACT This disclosure relates to a package construction adapted for vertical stacking and shipment in which a flexible product is enclosed within a paperboard receptacle, and a paperboard cover is disposed atop the flexible product in such a fashion that the cover rests on the product and telescopes over the receptacle such that other package constructions disposed thereabove bear upon the flexible product and not the paperboard container. The package construction contains a plastic film on its outer surfaces which is shrunk wrapped thereover and is fused thereto, thereby providing weather resistant protection for the contents thereof.

4 Claim, 1 Drawing Figure P'A'TENTEnJunzo m2 3,670,880

INVENTORS E. RICHARD BURLESON CARL HOWARD DAVIS ATTORNEY PACKAGE FOR FLEXIBLE PRODUCTS Heretofore, flexible products have been packaged in ordinary paperboard cartons. By flexible products" it is intended to mean granular-type material packaged in paper or cloth sacks and the like. The carton is disposed on a wooden pallet and the completed package is stacked four or five pallets high. Because of the weight of the pallets and package at the top of the stack and the inherent poor load resistance of paperboard containers, the packages at the bottom of the stack buckled, causing the remainder of the packages to tumble and break.

One solution to this problem has been to construct the cartons out of wood. This would provide the required strength for stacking numerous packages. However, economy always being a factor, the cost of the wooden cartons was prohibitive.

Accordingly, it is an object of the present invention to provide a weather resistant, puncture resistant paperboard package for packaging flexible products.

It is another object of the invention to provide a paperboard package that will not buckle and collapse when stacked one on top of the other.

Other objects, uses and advantages of this invention will become apparent from a reading of the following description which proceeds with reference to the accompanying drawing, forming a part thereof, and wherein the single FIGURE is a perspective view of the improved package construction of this invention.

Broadly, the container of the present invention consists of two separate parts. Each part is constructed of multi-wall corrugated board. The board is preferably coated inside and out with a fusible and weather resistant material. In the bottom tray is stacked the required amount of flexible products. The top corrugated cover is slipped over the material and telescoped over the outside of the bottom tray. A shroud of shrink film plastic is disposed over the outside of the entire package and is fused to the coating.

Referring now to the drawing, the improved package construction of this invention is generally indicated by the reference numeral 10. On top of a pallet 12 is disposed a receptacle 14 which may be permanently secured to the pallet with staples. The receptacle contains a substantially flat botmm 15 and upwardly extending peripheral sidewalls 16. The flexible products 18, which in this case are paper containers filled with powdered material, are vertically stacked on the receptacles within and extending above the top edge of the sidewalls.

A closure which contains a substantially flat top 21 and downwardly extending peripheral sidewalls 22 is disposed on the products 18. The top 21 of the closure rests on the flexible products, and the sidewalls 22 of the closure overlap a portion of the sidewalls 16 of the receptacle 14.

The receptacle and closure which are fabricated from multilayer corrugated board contain a fusible and weather resistant coating on the inner and outer surfaces thereof. Preferably, the fusible coating is composed of a mixture of paraffin wax and polyethylene in an approximate ratio of 50:50. Generally, paraffin waxes are produced from paraffin distillates and have melting points which range from about 120 to 150 F. The polyethylene additive should have a melting point in the range from about 150 to 200 F., preferably closer to 150" F. Another suitable composition consists of paraffin wax, microcrystalline wax and a copolymer of ethylene-vinyl acetate. The copolymer should have a molecular weight in the range from about 1,000 to 10,000. The base paraflin wax and the microcrystalline waxes may be of the type described in U.S. Pat. No. 3,098,598 issued July 23, 1963. The ethylenevinyl acetate copolymer may be one such as described in U.S. Pat. No. 3,093,623 issued June ll, i963. The wax mixture may be applied to the surfaces of the paperboard receptacle and closure by spraying, brushing or any other method known to those skilled in the art.

The top 21 and sidewalls 22 of the closure 20 and the sidewalls 16 of the receptacle 14 is then draped with a heat shrinkable plastic film having a thickness of about 8 mils, and

the package is disposed in a heat shrink oven which is maintained at a temperature sufficient to shrink the film over the containers and also to fuse it to the coating on the external surfaces of the container.

The films used in the present invention are nonnally composed of a thermoplastic resinuous material which has been oriented at least in one direction by stretching during its process of manufacture to render it shrinkable by heat. A cast or extruded film can be stretched to align the molecules into a more orderly pattern, giving the film increased strength and toughness, as well as shrinkability. In some cases, the film may be biaxially oriented to provide equal shrink in both the longitudinal and transverse dimensions of the film. The orientation also serves to increase the resistance to cold cracking of the film, so that it retains its flexibility at low temperatures.

One of the particularly preferred materials for use in this invention is a biaxially oriented polyvinyl chloride film. This material will shrink a maximum of about 60 percent at 325 F. With a source of hot air as the heating medium, the film is normally heated to 300 to 310 F. with a residence time of about 2 to 5 seconds.

While polyvinyl chloride is the preferred material, other heat shrinkable polymers can also be employed, such as,

oriented polyvinylidene polymers, vinyl-vinylidene copolymers, rubber hydrochloride, polyethylene, polypropylene and polyethylene terephthalate.

EXAMPLE A receptacle and closure as described above, was coated on the internal and external surfaces with a 50-50 blend of paraffin wax and polyehtylene. The receptacle was stapled to a wooden pallet. Both the receptacle and the closure were subjected to sub-zero temperatures to determine the effect. The bags of granular material were then stacked on the receptacle within the sidewalls to the desired height. The closure was then disposed above the packaged articles with the flat top surface resting thereon. The sidewalls telescoped over the sidewalls of the receptacle to a distance of about one-half the length of the receptacle sidewalls. The container was then draped on the top surface and all side surfaces with a polyvinyl chloride shroud which extended to the bottom of the pallet. The package was then placed in a shrink wrap oven maintained at a temperature of about 450 F.

After removal, the bond between the shroud and the coating was examined and found to be excellent. The container was found to be water resistant and when subjected to subzero temperatures, it was practically unaltered. The package was subjected to 12,000 pounds of pressure on the top and did not buckle.

Having thus described the invention in detail and with sufficient particularity as to enable those skilled in the art to practice it, what we desire to have protected by Letters Patent is set forth in the following claims.

We claim:

1. A paperboard package capable of being vertically stacked one upon another, comprising a receptacle including a substantially flat bottom and upwardly extending peripheral sidewalls, flexible products vertically disposed on said receptacle within and extending above the top edge of said sidewalls, a closure including a substantially flat top and downwardly extending peripheral sidewalls, the top of the closure resting on the flexible products, at least the outer surfaces of said receptacle and closure having a fusible and weather resistant coating thereon, the sidewalls of the closure overlapping only a portion of the sidewalls of the receptacle and a heat shrunk synthetic film sealed to the coating on at least the outer surfaces of the top and sidewalls.

2. Package of claim 1, which contains an inflexible pallet thereunder.

3. Package of claim 1, in which the coating is a mixture of paraffin wax and polyethylene.

4. Package of claim 1, in which the film is polyvinyl chloride.

'4: a t a a

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2988528 *Feb 3, 1958Jun 13, 1961Sun Oil CoWax compositions
US3089589 *May 9, 1960May 14, 1963Crown Zellerbach CorpContainer
US3508375 *Jul 25, 1968Apr 28, 1970Larry L Kaufman CoMethod and apparatus for covering a load on a pallet
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3850214 *Oct 20, 1972Nov 26, 1974Airflex Containers LtdContainers
US3904030 *May 10, 1973Sep 9, 1975Emerson Electric CoReturnable packaging system
US3999357 *Apr 21, 1975Dec 28, 1976American Can CompanyMethod of making double wrap package
US4032011 *Feb 26, 1976Jun 28, 1977Johns-Manville CorporationPackaging asbestos fibers
US4098400 *Mar 18, 1977Jul 4, 1978Emerson Electric Co.Returnable packaging system
US4114668 *Dec 1, 1976Sep 19, 1978Hickey Christopher Daniel DowlContainers having fluid-tight sealing means
US4149578 *Jun 6, 1978Apr 17, 1979Airflex Containers LimitedContainers having fluid-tight sealing means
US4177895 *May 23, 1978Dec 11, 1979Shelton Marcus HMoisture stabilized package
US4903494 *Aug 21, 1989Feb 27, 1990Wigley Freddie JMethod for preparing ice for transportation
US5298824 *Sep 13, 1990Mar 29, 1994Robert Bosch GmbhCovering for electrical machines
US5353936 *Nov 8, 1993Oct 11, 1994Dockstader Randal WProtective tray device for palletized loads
US5457938 *Nov 9, 1993Oct 17, 1995Eastman Kodak CompanyMethod of packaging and transporting photographic products
US5472092 *Mar 30, 1994Dec 5, 1995H. J. Heinz CompanyShrink wrapped package and method for its production
US5544472 *Mar 8, 1993Aug 13, 1996Oy W. Rosenlew AbMethod for packaging of bulk goods into a unit-load package and a unit-load package for bulk goods
US5664684 *Aug 30, 1995Sep 9, 1997H.J. Heinz CompanyShrink wrapped package and method for its production
US6012266 *Feb 6, 1998Jan 11, 2000Upm-Kymmene OyMethod for packing bulk goods and a container for bulk goods
USRE34533 *Oct 15, 1991Feb 8, 1994Wigley; Freddie J.Method for preparing ice for transportation
DE2413807A1 *Mar 22, 1974Oct 17, 1974Lantech IncVerfahren und vorrichtung zur herstellung von packungen mittels eines um das packgut herumgelegten bandes
DE2904055A1 *Feb 2, 1979Aug 14, 1980Effem GmbhVerfahren und sammelverpackung zum verpacken von warengebinden o.dgl.
DE10317392A1 *Apr 15, 2003Nov 4, 2004Saint-Gobain Isover G+H AgGroßgebinde für Transport und Lagerung von Dämmstoffelementen sowie Module aus Dämmstoffelementen hierfür
EP0012666A1 *Dec 4, 1979Jun 25, 1980Newtec InternationalPalletized packaging container for conserving and transporting agricultural and horticultural products
EP0026822A1 *Aug 7, 1980Apr 15, 1981Hoechst AktiengesellschaftMethod for making a transport package for calcium carbide
Classifications
U.S. Classification206/386, 206/83.5, 206/497, 53/449, 53/442
International ClassificationB65D71/00
Cooperative ClassificationB65D2571/00037, B65D2571/00055, B65D2571/00018, B65D71/0096
European ClassificationB65D71/00P1A
Legal Events
DateCodeEventDescription
Feb 24, 1987AS02Assignment of assignor's interest
Owner name: DRESSER INDUSTRIES, INC.,
Effective date: 19861211
Owner name: MI DRILLING FLUIDS COMPANY, HOUSTON, TX. A TX. GEN
Feb 24, 1987ASAssignment
Owner name: MI DRILLING FLUIDS COMPANY, HOUSTON, TX. A TX. GEN
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:DRESSER INDUSTRIES, INC.,;REEL/FRAME:004680/0403
Effective date: 19861211