US3764057A - High strength open bottom packaging tray - Google Patents

High strength open bottom packaging tray Download PDF

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Publication number
US3764057A
US3764057A US00280172A US3764057DA US3764057A US 3764057 A US3764057 A US 3764057A US 00280172 A US00280172 A US 00280172A US 3764057D A US3764057D A US 3764057DA US 3764057 A US3764057 A US 3764057A
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US
United States
Prior art keywords
tray
ribs
meat
side walls
accordance
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
Application number
US00280172A
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English (en)
Inventor
R Reifers
K Bixler
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.)
PACKAGINING Corp OF AMERICA A DE CORP
Packaging Corp of America
Original Assignee
Diamond International Corp
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Filing date
Publication date
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Publication of US3764057A publication Critical patent/US3764057A/en
Assigned to PACKAGINING CORPORATION OF AMERICA, A DE CORP. reassignment PACKAGINING CORPORATION OF AMERICA, A DE CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: DIAMOND INTERNATIONAL CORPORATION,
Assigned to PACKAGING CORPORATION OF AMERICA reassignment PACKAGING CORPORATION OF AMERICA ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: DIAMOND INTERNATIONAL CORPORATION
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
    • B65D1/34—Trays or like shallow containers
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/90—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in food processing or handling, e.g. food conservation
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
    • Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics

Definitions

  • ABSTRACT A tray of molded pulp or the like is provided for the packaging of meat, poultry or fish in conjunction with an overwrap transparent film.
  • the tray bottom is formed of a plurality of inverted V or U-shaped ribs joining or intersecting in two directions and defining open windows therebetween, the height of each inverted V-shaped rib being on the order of several times the thickness of the remainder of the tray, the side and end walls having double sloped portions, and the total volume of the inverted V-shaped ribs being approximately equal to the 'volume of a bottom of an imperforate bottom tray of the same size.
  • the present invention relates to an open bottom food container and, more particularly, to a food container for use for the packaging of fresh meat, poultry and fish in conjunction with a transparent overwrap film, and where the bottom wall is replaced with a plurality of open windowsdefined by structural beams; and the resultant high strength package so produced.
  • BACKGROUND Molded wood or paper pulp food trays have served the food packaging industry well for many years for the packaging of meat, fish and poultry.
  • Such trays have the advantage, besides low price and low cost to the consumer, of being clean, sturdy and safe; of being biodegradable so as to minimize the solids pollution problem; of being capable of assimilating the free liquid juices which exude from meat, fish and poultry; of being air and vapor permeable so as to maintain color and freshness of meat and permit passage of liquid vapors.
  • Meat packaging trays have evolved substantially over the years. The earlier trays had essentially straight side walls and a flat peripheral lip, and these served the trade successfully for many years. However, as the nature of transparent plastic wrap film changed and nonelastic and non-shrink cellophane was replaced with more elastic thermoplastic or stretch overwrap films, the tray in accordance with Reifers U.S. Pat. No. 3,185,371 was developed improving the tray performance. In more recent years there has been a strong consumer desire for greater visibility of fresh meat packaged in trays.
  • the embodiments illustrated in the Bixler application still suffer, under certain conditions, from some weakness, these weaknesses being manifested when a tray containing meat, fish or poultry is tightly overwrapped with transparent stretch film which strongly squeezes the tray side walls inwardly distorting them and causing failure where ribs only are the single support to side walls.
  • the embodiments illustrated in the Bixler application need to be strengthened, par ticularly where the V-ribs are joined to the side walls of the tray.
  • the smaller trays in accordance with the embodiments shown in the Bixler application may fail at this location because of the compressive force of the film alone whereas the larger size trays fail more easily here because of the compressive force of the film and because of greatly reduced beam strength in relation to the increased strength that is actually needed in the longer side walls.
  • the transition zone provided in the exemplified constructions of such copending application cover too great an area and thereby reduce the visibility to a greater degree than desirable.
  • the great beam strength provided by such a transition zone is not necessary in the smaller trays because their smaller width and length provides a reduced beam length.
  • the present invention provides an improved structure in the smallest sized trays by the utilization of an improved transition zone at the location where the ribs of inverted V cross-section meet the side and end walls of the tray. This is accomplished by providing double sloped end and side walls which provide good side wall cave-in resistance, adequate beam strength, and maximized visibility.
  • the height of the ribs is dependent on the size of the window openings therebetween, so that the smaller the opening and the greater the number of ribs for any given tray bottom area, the smaller the ribs need be in height, both for sufficient strength and for packaged product maintenance.
  • the packaged meat should be kept off the overwrap film on the bottom of the tray.
  • many small ribs tend to reduce visibility so that the preferred minimum rib height should be on the order of about %inches with openings therebetween of about 13/16 inch by 13/16 inch at the bottom of the inverted V-shaped ribs.
  • the total volume of the ribs forming the bottom of the tray and defining the open windows therebetween, is about -100 percent of the volume and weight of the same area of a bottom of a conventional tray of the same size, such as that shown in the Reifers U.S. Pat. No. 3,185,371.
  • Fresh meat packaged in conjunction with the tray of the present invention when formed of molded wood pulp, stays fresh much longer than meat packaged in the so-called clear polystyrene trays. Over the normal holding time in the supermarket showcase, fresh meat packaged in accordance with the present invention has better bloom retention, flavor retention, and better blood control resulting in substantial savings due to reductions in rewraps, less downgrading, and less actual meat loss. Improvement also occurs in the appearance of meat packaged in accordance with the present invention compared with meat packaged in foam plastic trays. In general, the tray of the present invention provides improved oxygen transmission, moisture vapor and blood control under the meat, no fiber optic problem like clear polystyrene trays, all resulting in improved meat appearance with unequalled protection to meat freshness.
  • the improved characteristics of the package of the present invention are accomplished by the use of the high support beams of inverted V-cross-section, which are themselves strong and which meet the end and side walls along a transition zorie which maintains high side wall compression resistance.
  • This rib connection with the side and end walls is accomplished by the use of walls which have a double slope.
  • the tray when the tray is manufactured of wood pulp, is provided by rib filling which determines the precise configuration of the ribs; the filling, in turn, is determined by the rib V-angle, the type of material from which the tray is formed, and the weight, height and rib thickness. These factors are selected to optimize window visibility, strength and nesting of the tray. In general, the included V-angle will lie in the range of about 5 to 35.
  • the fundamental aspects of the tray in accordance with the present invention may be said to be: spaced beam members, the spacing being open between such beam members to allow for viewing the tray contents between each beam of relatively solid material.
  • the section modulus of the beams is such that in combination with the end and side walls, the total strength equals orexceeds the beam strength of a tray of the same material of equal or slightly more weight with a flat, solid bottom.
  • a tray is provided for the packaging of meat, fish or poultry in association with an overwrap film of transparent plastic material such as shrink or stretch plastic film, or heatsealable cellophane.
  • the tray 10 has four upwardly and outwardly inclined walls 16 and these are preferably bowed as described in Reifers U.S. Pat. No. 3,185,371.
  • the adjacent side walls merge at rounded corners 12, and such side walls terminate at their upper end in a downwardly and outwardly extending peripheral lip 14; while any conventional peripheral lip may be used, the preferred lipcorresponds to the special lip disclosed in copending application Ser. No. 246,600. a
  • the tray 10 is provided with a plurality of ribs 20 which extend between the bottoms of the side walls 16. As is illustrated, the ribs 20 preferably extend in two different directions at right angles and are uniformly spaced to define therebetween windows of a more or less rectangular configuration. Of course, it will be understood that theremay be provided variations in the configuration,
  • the ribs and of the windows may intersect or meet at different angles so as to provide brick-work, diamond shaped, etc. window patterns.
  • the ribs 20 form a crosssection and inverted V-shape with their apices forming the meat supporting surface, and it is clear from inspection that the V-apex of each rib is well rounded unlike the sharp ribs which might be present in hard plastic that might cut or otherwise damage the meat.
  • the V ribs vary in cross-section along their length, i.e. they undulate, from a minimum included angle midway between each intersection of about 10 or less, to a maximum included angle adjacent each intersection on the order of about 30 included V-angle.
  • Such ribs are about 5/16 inches high and the open windows therebetween are about 11/ 16 inches square.
  • each rib 20 there is provided a slight horizontal flange portion 22 which is of a minimum width midway between each rib intersection, and of maximum width adjacent each rib intersection; for purposes of illustration the flanges 22 are shown in the drawing to be of larger size than in actual practice.
  • a major feature of the present invention constitutes the shape of the side walls 16 as best shown in FIGS. 3 and 4. While in the past it has been conventional to provide a side wall of a single curvature, it has now been found in accordance with the present invention that in order to maximize strength and visibility in a small tray of the size shown, that it is necessary to provide a double sloped wall.
  • the upper part of each wall 16 has an upper straight portion 15, an intermediate curved portion 17 and a lower straight portion 18.
  • the curved portion 17, in the preferred embodiment has a radius of curvature of 0.187 inch.
  • the upper portion 15 of the walls 16 is inclined from the vertical'at an angle of 17.
  • the lower vertical portion 18 is inclined at the same angle or substantially the same angle as the inverted V-shaped ribs 20 and, accordingly, has a steep angle of only about 5 from the vertical.
  • the tray of the present invention is preferably molded of conventional wood or paper pulp stock which may be formed or preformed from a water slurry, it will be understood that other materials may be used; the ribs may be made ofharder paper stock, or
  • the wood pulp stock comprises about 3 percent ureaformaldehyde wet strength resin or about 1 /2 percent melamineformaldehydewet strength resin (both FDA approved) and, furthermore, has a largecapacity to accept free liquids which have exuded from the problem cuts or heavy blee'ders," as they are known in the art; in this embodiment the bottom-of the tray ribs may be specially treated with an inert, impervious water-resistant substance, e.g. wax or plastic such as polyethylene, while the upper portions of the ribs will accept this free liquid and expand to provide a softened cushion-for the meat.
  • the rib tops may also be coated with the impervious substance, leaving the side rib surfaces and its center free to accept excess free liquids.
  • the lip 14 is provided with a special shape which is particularly useful when used in combination with the special wood pulp stock having free liquid accepting capacity.
  • the peripheral lip 14 has an outwardly extending horizontal terminal portion 141 and an upper domed portion 142. When overwrapped with a heat-sealable film the film contacts the lip at both location 141 and location 142 and thereby forms a double seal or gasket.
  • the special accepting furnish in conjunction with the double sealing provided by the lip 14 prevents the travel of free liquid by capillary action between the film and the lip from the inside to the outside of the tray where it would cause the plastic heat seal of the plastic film'to open thereby effecting leakage and unwrapping of the package, besides providing an unsightly appearance.
  • the special lip 14 also has mechanical advantages even without the special accepting furnish.
  • the lip 14 is provided with greater material mass which provides additional cave-in resistance against the tension exerted by the stretched overwrapped film.
  • the horizontal portion 141 being at a height considerably lower than the top 142 of the lip 14, absorbs inwardly directed forces in a manner that stresses the side wall 16 less because the resultant lever arm is lower, e.g. 30-35 percent lower. Additional vector analysis shows that the net effect in inward deflection resulting from inward force is reduced and there is 12 percent less bending moment.
  • the tray of the present invention may be formed of other, equivalent materials, the structural advantages of the tray deriving from its geometry.
  • the tray may be formed of plastic foam, such as structural cellular polystyrene foam comprising on the order of 70 percent void space, or porous polyolefin material or other open cell plastic, or a biodegradable plastic such as biodegradable foam polystyrene. If formed of materials having different strength characteristics, various changes in the configuration may be necessary and depending on the material, certain advantages may be absent.
  • the tray of the present invention has many advantages, a number of which have been delineated above. In brief, however, it may be noted:
  • the tray has sufficient strength to resist handling during wrapping; compression of film on the inward side wall is the main force which tends to cause side wall deformation or collapse, but the present tray resists such deformation or collapse.
  • the tray resists damage from handling in the store and by consumer at home; insufficient beam strength of package for weight of contents may, tend to deform or break some packages when lifted, but the tray of the present invention tends to resist such deformation or breakage.
  • the open meat suspending structure promotes oxygen transfer as does the absence of free liquid pools which in other packages clog the pores of the overwrap film. This maintains better meat color and provides for maintenance of meat bloom and quality over the extended period for store sale to home storage.
  • no anaerobic bacteria, such as slime bacteria or botulism are
  • the ribbed tray suspends the entire bottom of the meat in a moisture saturated atmosphere, desirable for meat quality preservation. Only a small amount of liquid exudes from the meat and a portion of this water evaporates to provide this moisture laden atmosphere; the remaining portion of exuded liquid is controlled by the pulp. This controlled acceptance of free liquids enhances appearance, maintains near perfect visibility and prolongs the freshness and bloom of the meat.
  • the actual contact of the meat with the tray is less than any tray structure ever known in commercial use. This minimal contact of the meat with the tray together with the maintenance of the moisture saturated atmosphere inhibits the exuding of liquids and insures that the meat retains its moist surface and juicy character but without forming puddles or pools of liquid.
  • Refrigeration Beam bottom construction holds meats suspended, providing improved circulation of moisture saturated air for oxygenation of the meat.
  • the construction of the present invention with its open windows serves to effectively control the free flowing of bloody liquid.
  • the trays of the present invention with the multiple open window features maintain the advantages of control of exuding liquid, primarily by maintaining a saturated atmosphere about the meat but also by controlled acceptance while at the same time taking advantage of this control to maintain excellent visibility in the windows that are breathable, maintaining great effectiveness of the transparent film over the entire surface of the package, protecting it to the maximum freshness and minimum bacterial action.
  • the trays of the present invention also have no problem of cutting film like the clear plastic trays because the film is protected by the soft edges of the pulp tray.
  • the meat contained in the clear polystyrene tray is exposed to bacteria and other contamination when the film has been cut by the sharp edges of the polystyrene tray.
  • the meat in the clear polystyrene trays nearly always discolors on the bottom first because of the destructive effects of the non-breathing, light transmitting, clear styrene material.
  • the trays of the present invention work to protect the meat freshness so perfectly that the bottom of the meat most'always retains its meat freshness longer than the top of the meat under conditions of extended storage.
  • a generally rectangular molded tray for the packaging of fresh meat, fish or poultry in conjunction with a transparent overwrap film heat-sealed thereabout, said tray comprising upwardly and outwardly inclined side walls defining the rectangular configuration; a generally rounded corner between each adjacent side wall; and a peripheral lip extending outwardly from said side walls and defining the periphery of said tray, the improvement comprising:
  • said ribs extending in one direction, and other of said ribs extending in a different direction, said ribs meeting and defining therebetween a plurality of open windows, said ribs having a section modulus in combination with said side walls such that the total strength is substantially equal to the beam strength of a tray of the same material of equal weight with a flat, imperforate bottom;
  • said means comprising a curved portion in each of said side walls thereby defining in such side walls a straight upper portion, a curved center portion and a straight bottom portion, said bottom portion having a height equal to the height of said inverted V- shaped ribs.
  • a tray in accordance with claim 1 molded of wood pulp.

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  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Packages (AREA)
  • Packging For Living Organisms, Food Or Medicinal Products That Are Sensitive To Environmental Conditiond (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Buffer Packaging (AREA)
  • Biological Depolymerization Polymers (AREA)
US00280172A 1972-08-14 1972-08-14 High strength open bottom packaging tray Expired - Lifetime US3764057A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US28017272A 1972-08-14 1972-08-14

Publications (1)

Publication Number Publication Date
US3764057A true US3764057A (en) 1973-10-09

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ID=23071988

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US00280172A Expired - Lifetime US3764057A (en) 1972-08-14 1972-08-14 High strength open bottom packaging tray

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US (1) US3764057A (xx)
JP (2) JPS4944894A (xx)
AT (1) AT335901B (xx)
AU (1) AU469914B2 (xx)
BE (1) BE791848R (xx)
BR (1) BR7208389D0 (xx)
CA (1) CA963851A (xx)
CH (1) CH563923A5 (xx)
ES (1) ES213248Y (xx)
FR (1) FR2195552B2 (xx)
GB (1) GB1420847A (xx)
IL (1) IL40674A (xx)
IT (1) IT969889B (xx)
LU (1) LU66550A1 (xx)
NL (1) NL7215331A (xx)
NO (1) NO135899C (xx)
ZA (1) ZA727393B (xx)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3845896A (en) * 1973-01-31 1974-11-05 Keyes Fibre Co Open bottom tray with multiple pedestal display platform
US3885728A (en) * 1973-06-25 1975-05-27 Keyes Fibre Co Packaging tray with upper and lower viewing windows
US3894679A (en) * 1974-06-21 1975-07-15 Diamond Int Corp High strength open bottom packaging tray
US3986655A (en) * 1976-02-03 1976-10-19 Keyes Fibre Company Packaging tray
US4132028A (en) * 1977-05-20 1979-01-02 Takara Co., Ltd. Reconfigurable toy with optical elements
US4162759A (en) * 1977-12-30 1979-07-31 Diamond International Corporation Food packaging tray
US4427706A (en) 1981-03-16 1984-01-24 General Foods Corporation Method for heating par-fried, batter-coated frozen foods
US4442969A (en) * 1983-04-28 1984-04-17 Mobil Oil Corporation Reinforced packaging tray
US4603052A (en) * 1979-06-27 1986-07-29 General Foods Corporation Method for oven-heating frozen fried foods
USD743812S1 (en) 2012-02-10 2015-11-24 Curwood, Inc. Rigid ribbed tray

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO148446C (no) * 1976-05-12 1983-10-12 Vaettoe R Sproeytestoept baereunderlag av plast for bruk som transportemballasje

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4112443Y1 (xx) * 1964-03-10 1966-06-11

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3845896A (en) * 1973-01-31 1974-11-05 Keyes Fibre Co Open bottom tray with multiple pedestal display platform
US3885728A (en) * 1973-06-25 1975-05-27 Keyes Fibre Co Packaging tray with upper and lower viewing windows
US3894679A (en) * 1974-06-21 1975-07-15 Diamond Int Corp High strength open bottom packaging tray
US3986655A (en) * 1976-02-03 1976-10-19 Keyes Fibre Company Packaging tray
US4132028A (en) * 1977-05-20 1979-01-02 Takara Co., Ltd. Reconfigurable toy with optical elements
US4162759A (en) * 1977-12-30 1979-07-31 Diamond International Corporation Food packaging tray
US4603052A (en) * 1979-06-27 1986-07-29 General Foods Corporation Method for oven-heating frozen fried foods
US4427706A (en) 1981-03-16 1984-01-24 General Foods Corporation Method for heating par-fried, batter-coated frozen foods
US4442969A (en) * 1983-04-28 1984-04-17 Mobil Oil Corporation Reinforced packaging tray
USD743812S1 (en) 2012-02-10 2015-11-24 Curwood, Inc. Rigid ribbed tray

Also Published As

Publication number Publication date
LU66550A1 (xx) 1973-06-08
BR7208389D0 (pt) 1974-04-25
CH563923A5 (xx) 1975-07-15
FR2195552A2 (xx) 1974-03-08
NL7215331A (xx) 1974-02-18
ES213248Y (es) 1976-11-01
AT335901B (de) 1977-04-12
JPS542529U (xx) 1979-01-09
AU4825672A (en) 1974-05-16
FR2195552B2 (xx) 1975-03-28
DE2314885A1 (de) 1974-03-14
IT969889B (it) 1974-04-10
NO135899C (xx) 1977-06-22
JPS4944894A (xx) 1974-04-27
IL40674A0 (en) 1973-01-30
CA963851A (en) 1975-03-04
ZA727393B (en) 1973-06-27
AU469914B2 (en) 1974-05-16
ES213248U (es) 1976-06-16
BE791848R (fr) 1973-05-24
DE2314885B2 (de) 1977-05-18
GB1420847A (en) 1976-01-14
IL40674A (en) 1974-11-29
ATA974372A (de) 1976-07-15
NO135899B (xx) 1977-03-14

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Legal Events

Date Code Title Description
AS Assignment

Owner name: PACKAGINING CORPORATION OF AMERICA, EVANSTON, ILL.

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST. EFFECTIVE SEPT 26,1983;ASSIGNOR:DIAMOND INTERNATIONAL CORPORATION,;REEL/FRAME:004311/0207

Effective date: 19840731

AS Assignment

Owner name: PACKAGING CORPORATION OF AMERICA EVANSTON, IL A CO

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:DIAMOND INTERNATIONAL CORPORATION;REEL/FRAME:004359/0673

Effective date: 19850803