US3894679A - High strength open bottom packaging tray - Google Patents

High strength open bottom packaging tray Download PDF

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Publication number
US3894679A
US3894679A US481850A US48185074A US3894679A US 3894679 A US3894679 A US 3894679A US 481850 A US481850 A US 481850A US 48185074 A US48185074 A US 48185074A US 3894679 A US3894679 A US 3894679A
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US
United States
Prior art keywords
tray
ribs
meat
accordance
wall means
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
US481850A
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English (en)
Inventor
Richard F Reifers
Henry A Lord
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
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
Application filed by Diamond International Corp filed Critical Diamond International Corp
Priority to US481850A priority Critical patent/US3894679A/en
Priority to CA206,361A priority patent/CA1021734A/fr
Priority to GB8685/75A priority patent/GB1484439A/en
Priority to GB5763/76A priority patent/GB1484440A/en
Priority to ZA00751333A priority patent/ZA751333B/xx
Priority to SE7502429A priority patent/SE7502429L/xx
Priority to IL46769A priority patent/IL46769A/xx
Priority to IL52653A priority patent/IL52653A/xx
Priority to ES435593A priority patent/ES435593A1/es
Priority to AU79098/75A priority patent/AU475176B2/en
Priority to DK114775A priority patent/DK114775A/da
Priority to IT21472/75A priority patent/IT1034443B/it
Priority to CH358075A priority patent/CH590761A5/xx
Priority to AT232775A priority patent/AT341941B/de
Priority to NL7504209A priority patent/NL7504209A/xx
Priority to NO751240A priority patent/NO751240L/no
Priority to DE2516412A priority patent/DE2516412C3/de
Priority to JP50053068A priority patent/JPS512577A/ja
Priority to BE157178A priority patent/BE830056A/fr
Priority to FR7518302A priority patent/FR2275368A1/fr
Priority to LU72775A priority patent/LU72775A1/xx
Priority to BR5031/75D priority patent/BR7503916A/pt
Publication of US3894679A publication Critical patent/US3894679A/en
Application granted granted Critical
Priority to ES1976232134U priority patent/ES232134Y/es
Priority to IL52653A priority patent/IL52653A0/xx
Priority to CA284,174A priority patent/CA1039545A/fr
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

Definitions

  • the tray bottom is formed of a plurality of generally vertical ribs joining or intersecting in two directions and defining open windows therebetween, the height of each 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 ribs being approximately equal to the volume of a bottom of an imperforate bottom tray of the same size.
  • the method of making a tray including the steps of (a) taking a wet preform of molded pulp or the like formed in an open bottom construction with a plurality of inverted V or U-shaped ribs joining or intersecting in two directions and defining open windows therebetween and pressing the side walls of the V or U-shaped ribs together to impart to said ribs the form of generally vertical ribs with parallel side wall portions, and (b) drying the tray under controlled conditions to final form for storage or shipment.
  • the apparatus for making a tray comprising a male form ing die member including a plurality of rib grooves joining or intersecting in two directions into which a wet preform of molded pulp or the like may be trans ferred; a stuffing element for effecting initial seating of the rib members of the wet preform within the rib grooves; and female press die member with a plurality of insert plugs for pressing the ribs of the preform into the rib grooves of the male die member into fully seated relationship whereby final shape of the tray is imparted to the preform,
  • 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 windows defined by structural beams, and the resultant high strength package so produced.
  • the present invention aditionally relates to the method and apparatus by which such a container is made.
  • BACKGROUND Molded wood or paper pulp food trays have served the food packaging industry well for many years for the packaging of fresh 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 fresh 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.
  • trays collect liquid exudants in puddles from the fresh meat, fish and poultry packaged therein, thereby not only causing discoloration of the packaged product, but also serving as a bacterial breeding ground and further serving to opacify the package itself and provide distortion in the remaining transparent areas thereby contributing to the very problem which such trays were designed to overcome; blood that goes under the tray acts to release the sealed film causing soiled hands, soiled check-out counters, leaking packages, etc.
  • the conventional plastic trays being formed of non-breathable material, inhibit oxygen migration to the meat at the bottom of the tray; this causes further discoloration of the meat and it is well known that fresh red meat in plastic trays deteriorates on the bottom first.
  • Another defect of the clear plastic trays involves their transmission of light along the plane of the tray walls, i.e., a light pipe or fiber optic effect; this causes further discoloration of the bottom of the meat.
  • Light transmitted through clear plastic trays has a negative effect on fresh meat quality as it causes relatively rapid discoloration when compared with the effect of natural or artificial light on meat packaged in otherwise similar conditions.
  • meat packaged in clear plastic has its bottom exposed to light constantly even when the tray rests on an opaque object such as the bottom of the meat cooler or an underlying package or between two packages.
  • Meat packaging trays have evolved substantially over the years. The earlier trays had essentially straight side walls and a fiat 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.
  • a recent approach to provide visibility through the bottom wall of the tray corresponding to the invention of the Reifers, et al., application Ser. No. 280,172, filed Aug. 14, 1972, uses a plurality of meeting or intersecting, inverted V or U cross-section shaped ribs extending across the bottom of the tray.
  • This construction provides improved visibility with reduced meat contact, and the inverted Vshaped ribs provide for a reinforced structure.
  • the construction exemplified in the Reifers, et al., application is, in many respects, a successful approach to the problem, and the present invention constitutes an improvement on this basic construction.
  • the present invention provides an improved tray construction and method and apparatus of producing such an improvement wherein the rib structure will be vertical and preferably without bottom flange or web to provide maximum visibility and precise control of rib depth for each and every tray.
  • 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 pack aged 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 7/64 inch to V4 inch with openings therebetween from 54 inch to 1 inch depending upon shape of opening.
  • the ribs have a width of only about 34; inch to about 3/16 inch.
  • the total volume of wood pulp forming the ribs, before reshaping thereof, at the bottom of the tray and defining the open windows therebetween is about -100% 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; in the final product the rib volume is less than 90%, the preformed ribs having been compressed and densified during reshaping.
  • Fresh meat packaged in conjunction with the tray of the present invention when formed of molded wood pulp, stays fresh significantly 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 blood retention, flavor retention, and better blood control resulting in substantial savings due to reductions in rewraps, less downgrading, hence less actual loss of the original money value of the meat. Also, by using trays of the present invention there is effected a reduced amount amount of meat that is actually thrown out because of its acquiring an unsalable appearance, odor, etc. 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 the fresh appearance and the fresh odor of meat.
  • the improved characteristics of the package of the present invention are accomplished by the use of the high support beams of rib construction, which are themselves strong and which meet the end and side walls along a transition zone 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 been formed so as to be generally vertical.
  • the high rib strength when the tray is manufactured of wood pulp, is provided by rib side walls extending in generally vertically-pressed-together reinforcing relationship to better support vertical loads applied to rib structure of comparable weight, height and rib thickness. Further, improved visibility and appearance is provided in the tray according to the present invention.
  • 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 or exceeds the beam strength of a tray of the same material of equal or slightly more weight with a flat imperforate solid bottom.
  • FIG. 1 is a top plan view of a preferred embodiment of a tray in accordance with the present invention.
  • FIG. 2 is a bottom plan view of the tray of FIG. 1;
  • FIG. 3 is a front elevation of the tray of FIGS. 1 and
  • FIG. 4 is a section taken along line 4-4 of FIG. 1;
  • FIG. 5 is a top plan view of a male die member according to the present invention with a wet preform of molded pulp or the like disposed therein for a finishing operation;
  • FIG. 6 is an elevational view taken along line 66 of FIG. 5;
  • FIG. 7 is an enlarged fragmentary view of the apparatus in FIG. 6 together with a cooperating female pressing die member
  • FIG. 8 shows the die members of FIG. 7 in the engaged pressing condition thereof
  • FIGS. 9-12 show enlarged fragmentary views in section of the die members of an alternative embodiment of the present invention according to the sequence of operation;
  • FIG. 13 shows an elevational view in section of the male die member of FIGS. 9-12 with a grid stuffing bar assembly engaged therewith;
  • FIG. 14 is a view in perspective showing details of the bottom of a stuffing bar assembly
  • FIG. 15 is a fragmentary exploded elevational view in section of the male and female die members of FIGS. 9-12 prior to engagement thereof;
  • FIG. 16 is an elevational view in section of the die members of FIG. 15 in the engaged condition thereof.
  • a tray 10 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 heat-scalable 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,l85,37l.
  • 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 lip corresponds to the special lip disclosed in copending application Ser. No. 280,172.
  • the tray 10 is provided with a plurality of marginal ribs 18 and inner ribs 20 which extend between the bottoms of the side walls 16.
  • the marginal ribs 18 extend in slightly arcuate marginal expanses and inner 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.
  • the ribs may intersect or meet at different angles so as to provide brick-work, diamond-shaped, window patterns, or the trays may be generally circular, hexagonal or other similarly shaped members with the vertical ribs thereof being of a shape similar to that of the tray member having such ribs.
  • a construction in accordance with the present invention may also be made with the annular transition zone of Ser. No. 280,172.
  • each inner rib 20 meets at each end thereof with three other inner ribs 20 in a recess 22.
  • the present invention also provides the feature in which the shape of the side walls 16, as best shown in FIGS. 3 and 4 are formed with a double slope to enhance the strength thereof.
  • 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 l7.
  • 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, including foam plastic or the like, may be used; the ribs may be made of harder paper stock, or such ribs may be specially pressed or otherwise treated.
  • the wood pulp stock comprises about 3% urea-formaldehyde wet strength resin or about 196% melamine-formaldehyde wet strength resin (both FDA approved) and, furthermore, has a large capacity to accept free liquids which have exuded from the problem cuts or heavy bleeders", as they are known in the art; in this embodiment the bottom of the tray ribs may be specially treated with an inert, impervious waterresistant 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.
  • an inert, impervious waterresistant substance e.g., wax or plastic such as polyethylene
  • 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 tray 10 may be formed with an upper layer L of a certain grade of material, usually a higher grade, and a lower layer L of another grade of material.
  • the preferred embodiment of the apparatus for producing the tray according to the present invention is seen to include a male finishing die member upon which a wet preform 10 of molded wood pulp or the like may be transferred and a pressing head or female die member 150.
  • the press ing head or female die member in operation presses the wet preform into the male die member 100 and thus imparts final form to the tray to be formed by the preform 10.
  • a closer look at male die member 100 reveals that it comprises an aluminum core 102 with a receiving mold sub-assembly 104 of resiliently deformable material such as silicone rubber.
  • the receiving mold subassembly 104 is provided with a plurality of rib grooves 106 and cavities 108.
  • the side walls of the rib grooves 106 and the side walls of the cavities are inclined from the vertical at approximately 5 as best seen in FIG. 7.
  • the pressing head or female die member 150 preferably is of aluminum and comprises a plurality of plugs 152 and pressing bars 156.
  • the side walls 154 of each plug 152 are inclined toward the center thereof from the vertical at approximately 10.
  • rib grooves 106 will be provided in an intersecting pattern in grid form upon which the ribs 20 of wet preform may be transferred and received.
  • the cavities 108 correspond generally in location to the open window space defined by the ribs of the finished ,tray of FIG. 1.
  • plugs 152 are in registration with cavities 108 and pressing bars 156, which correspond with rib grooves 106 in grid-like arrangement, are in registration therewith.
  • a wet preform 10 of wood pulp for the tray to be made is transferred from a suction mold, for example, and deposited, bottom side up, over the receiving mold sub-assembly 104.
  • the ribs of the preform as seen in FIG. 7 are generally V-shaped and as the rib grooves 106 are provided with inclined side walls, reception thereof by the grooves is facilitated. Preliminary entry or stuffing of the ribs of the preform may also be facilitated by use of a stuffing grid bar 280, as seen in FIG. 14. As pressing head 150 is lowered into the position illustrated in FIG.
  • the inclined side walls of rib grooves 106 will be compressed into vertical position, which thereupon reshapes the ribs 20 into vertically extending members. Compression of the inclined side walls of rib grooves 106, as clearly illustrated, is the result of outward transverse deformation of cavities 108 by entry of plugs 152 therein.
  • heat may be applied to the closed dies so that the product may be form-dried or the product may be removed from the male die member and free-dried on an open conveyor chain, this latter preferably being with the screen side of the tray up.
  • the silicone rubber receiving mold sub-assembly 104 Upon removing the pressing head 150 from engagement with the male die member 100, the silicone rubber receiving mold sub-assembly 104 will resume the form illustrated in FIG. 4, whereupon the tray 10 may be freely removed therefrom.
  • the selection of material for the sub-assembly 104 is not to be limited to silicone rubber, but may be any yieldable material capable of withstanding drying temperatures and recovering the original form thereof.
  • FIGS. 9-16 An alternative form of the apparatus according to the present invention is illustrated in FIGS. 9-16.
  • the alternative apparatus comprises a male receiving die member 200, a female pressing die member 250, and a grid stuffing bar assembly 280.
  • Male receiving die member 200 preferably is of aluminum and includes a plurality of rib grooves 206 with vertically extending side walls. Rib grooves 206, as is to be clearly understood, are to be of generally the same arrangement as those of die member 100 of the previ' ous embodiment, that is, in intersecting grid arrangement. Extending upwardly from the upper extremity of vertical side wall of each groove 206 is an upwardly diverging passageway 216 which facilitates reception therein of the ribs 20 of the wet preform for the tray 10.
  • Female pressing die member 250 comprises a plurality of pressing bar elements 256 formed with normally vertical side walls and cut-out slots 258 at the lower ends thereof which allow inward displacement of material. Portions of the female pressing die member 250, which, in operation, engage with the female receiving member 200, are of silicone rubber or the like and thus may be resiliently deformed as required.
  • Grid stuffing bar assembly 280 comprises a plurality of vertically extending stuffing bar portions intersecting in at least two directions and adapted to be in registration with passageways 216 of male die member 200.
  • Female pressing die member 250 and grid stuffing bar assembly 280 may be mounted in a turret arrangement, whereby they may be selectively positioned for operation.
  • a wet preform 10, as heretofore described, may be transferred from a suction mold, for example, and deposited, bottom side up, over the receiving die member 200, as seen in FIG. 9.
  • the ribs 20 of the preform 10 may, as formed, be generally V- shaped in cross-section and include trailing overhanging portions to hinder free and full entry thereof into passageways 216.
  • Use of grid stuffing bar assembly 280 is thus resorted to, whereby ribs 20 are urged into passageways 216 under the influence of stuffing bar assembly 280 as seen in FIG. 10.
  • stuffing bar assembly 280 withdrawn and female pressing die member is brought into registration with male receiving die member 200, as seen in FIG. 11, and lowered thereinto, as seen in FlG. 12.
  • Female pressing die member 250 is of resiliently deformable material such as silicone rubber, and because of this the pressing bar elements 256 will be yieldably compressed by the tapered passageways 216 to form to the contour thereof as seen in FIG. 12.
  • the length of the pressing bar elements, as seen in FIG. 12, is such that the rib elements 20 will be caused to be fully seated in the rib grooves 206 and be reshaped so as to have vertically extending side walls. Also, the trailing portions of the rib elements 20 of the preform as seen in FIG. 11 will be flattened when female pressing die member 250 reaches the fully engaged relationship with male receiving die member 200.
  • Depth of penetration of pressing bar elements 256 is limited by horizontally extending face portions 257 which extend from opposite sides of the upper ends of pressing bar elements 256. Thus, penetration of pressing bar elements 256 into passageways 216 is terminated upon contact of the horizontally extending face portions 257 of female pressing die member 250 with the upper outer horizontal surface 217 of male die member 200.
  • depth or height of ribs 20 may be controlled by the length of pressing bar elements 256 and the cooperating rib grooves 206.
  • heat may be supplied thereto to form-dry the tray or, alternatively, female die member 250 may be withdrawn and the tray 10 as shaped may be withdrawn from male die member 200 by any known means and transferred to be dried, for example, on free-drying apparatus.
  • 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% void space, or porous polyolefin material or other open cell plastic, or a biodegradable plastic such as biodegradable foam polystyrene. lf 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 improved 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; and improved capacity in supporting vertical loads.
  • 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 blood and quality over the extended period for store sale to home storage. ln addition, anaerobic bacteria, such as slime bacteria, are controlled or destroyed with the high oxygen transmission provided.
  • the ribbed tray suspends the entire bottom of the meat in a moisture saturated atmosphere, which is desirable for meat quality preservation.
  • 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 tray.
  • the meat in the clear polysty rene trays nearly always discolors on the bottom first because of the destructive effects of the nonbreathing, 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.
  • both the male and female pressing dies may be formed of non-elastic material such as metal, in which case a small taper, on the order of about from the vertical, may be necessary and will occur in the ribs of the final product.
  • a 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 wall means defining a peripheral configuration; a generally rounded corner between each adjacent portion of said wall means; and a peripheral lip extending outwardly from said wall means and defining a periphery coaxial to the configuration of said tray, the improvement comprising:
  • said breathing and support means comprising a plurality of strong, substantially solid ribs, each having vertically extending side wall portions squeezed to gether and joined at the top with a rounded apex, some of 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 wall means 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.
  • a tray in accordance with claim 1 molded of wood pulp or like material, said ribs being of compressed wood pulp or like material.
  • a tray in accordance with claim 2 wherein said vertically extending side wall portions of each of said ribs are integral and have inner surfaces in contacting relationship.
  • a tray in accordance with claim 1 including means to resist deformation of said wall means from the inward pressure of wrapping film and to increase rigidity and strength at the location where said solid ribs join said wall means, said means comprising a curved portion in said wall means thereby defining in such wall means 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 solid ribs, wherein the bottom portion of said walls means are inclined at an angle of about 5 from the vertical.

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  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Packging For Living Organisms, Food Or Medicinal Products That Are Sensitive To Environmental Conditiond (AREA)
  • Packages (AREA)
  • Table Devices Or Equipment (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Molding Of Porous Articles (AREA)
  • Paper (AREA)
  • Making Paper Articles (AREA)
US481850A 1974-06-21 1974-06-21 High strength open bottom packaging tray Expired - Lifetime US3894679A (en)

Priority Applications (25)

Application Number Priority Date Filing Date Title
US481850A US3894679A (en) 1974-06-21 1974-06-21 High strength open bottom packaging tray
CA206,361A CA1021734A (fr) 1974-06-21 1974-08-06 Emballage a fond ajoure, haute resistance; appareil et technique de fabrication
GB5763/76A GB1484440A (en) 1974-06-21 1975-03-03 Method and apparatus for making a high strength open bottom packaging tray
GB8685/75A GB1484439A (en) 1974-06-21 1975-03-03 High strength open bottom packaging tray
ZA00751333A ZA751333B (en) 1974-06-21 1975-03-04 High strength openbottom packaging tray and method and apparatus for making same
SE7502429A SE7502429L (sv) 1974-06-21 1975-03-05 Forpackningstrag med oppen botten samt sett och apparat for framstellning derav.
IL46769A IL46769A (en) 1974-06-21 1975-03-07 High strength open bottom packaging tray
IL52653A IL52653A (en) 1974-06-21 1975-03-07 Method and apparatus for making high strength open bottom packaging tray
ES435593A ES435593A1 (es) 1974-06-21 1975-03-13 Metodo y su correspondiente aparato de acabado para impartirsu forma final a una bandeja de pulpa moldeada para el enva-sado de carne, pescado o aves frescas.
AU79098/75A AU475176B2 (en) 1974-06-21 1975-03-14 High strength open bottom packaging tray and method and apparatus for making same
DK114775A DK114775A (da) 1974-06-21 1975-03-20 Emballagebakke
IT21472/75A IT1034443B (it) 1974-06-21 1975-03-20 Vassoio d imballaggio con fondo aperto d elevata resistenza e pro cedimento e dispositivo per la sua fabbricazione
CH358075A CH590761A5 (fr) 1974-06-21 1975-03-20
AT232775A AT341941B (de) 1974-06-21 1975-03-26 Schale aus holzfaserstoff, schaumkunststoff od.dgl. sowie verfahren und vorrichtung zu ihrer herstellung
NL7504209A NL7504209A (nl) 1974-06-21 1975-04-09 Van een open bodem voorziene verpakkingshouder, benevens werkwijze en inrichting voor het maken van deze houder.
NO751240A NO751240L (fr) 1974-06-21 1975-04-09
DE2516412A DE2516412C3 (de) 1974-06-21 1975-04-15 Gießgeformte Schale zum Verpacken von Frischfleisch, Fisch oder Geflügel
JP50053068A JPS512577A (en) 1974-06-21 1975-05-01 Namanoshokuniku sakanamatahatorinikuohososurutamenokataseikeitoreekataseikeisaretaparupu mataha ruijizairyonokaihosokotoreeoshiageruhoho oyobidotoreenisaishukeiofuyosurutamenoshiagesochi
BE157178A BE830056A (fr) 1974-06-21 1975-06-10 Plateau rigide a fond ouvert pour emballage de viande, son procede de fabrication et outillage mis en oeuvre dans ce procede
FR7518302A FR2275368A1 (fr) 1974-06-21 1975-06-11 Plateau rigide a fond ouvert pour emballage de viande, son procede de fabrication et outillage mis en oeuvre dans ce procede
LU72775A LU72775A1 (fr) 1974-06-21 1975-06-19
BR5031/75D BR7503916A (pt) 1974-06-21 1975-06-20 Aperfeicoamento em bandeja moldada,aparelho de acabamento e em processo para acabamento de uma bandeja de base aberta de polpa moldada ou semelhante
ES1976232134U ES232134Y (es) 1974-06-21 1976-10-28 Una bandeja moldeada para el envasado de carne, pescado o a-ves frescas.
IL52653A IL52653A0 (en) 1974-06-21 1977-08-04 High strength open bottom packaging tray and method and apparatus for making same
CA284,174A CA1039545A (fr) 1974-06-21 1977-08-05 Fort plateau d'emballage a fond ouvert, et methode de materiel de fabrication connexe

Applications Claiming Priority (1)

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US481850A US3894679A (en) 1974-06-21 1974-06-21 High strength open bottom packaging tray

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US56878475A Division 1975-04-17 1975-04-17

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US3894679A true US3894679A (en) 1975-07-15

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US (1) US3894679A (fr)
JP (1) JPS512577A (fr)
AT (1) AT341941B (fr)
AU (1) AU475176B2 (fr)
BE (1) BE830056A (fr)
BR (1) BR7503916A (fr)
CA (1) CA1021734A (fr)
CH (1) CH590761A5 (fr)
DE (1) DE2516412C3 (fr)
DK (1) DK114775A (fr)
ES (2) ES435593A1 (fr)
FR (1) FR2275368A1 (fr)
GB (2) GB1484439A (fr)
IL (2) IL46769A (fr)
IT (1) IT1034443B (fr)
LU (1) LU72775A1 (fr)
NL (1) NL7504209A (fr)
NO (1) NO751240L (fr)
SE (1) SE7502429L (fr)
ZA (1) ZA751333B (fr)

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2340247A1 (fr) * 1976-02-03 1977-09-02 Keyes Fibre Co Plateau pour la presentation et l'emballage de viande fraiche et autres aliments
US4162759A (en) * 1977-12-30 1979-07-31 Diamond International Corporation Food packaging tray
US4442969A (en) * 1983-04-28 1984-04-17 Mobil Oil Corporation Reinforced packaging tray
US4702377A (en) * 1984-11-20 1987-10-27 Lin Tec Verpackungstechnik Gmbh Tray for receiving foodstuffs and a process and apparatus for producing it
USRE33143E (en) * 1984-11-20 1990-01-09 Lin Tec Verpackungstechnik Gmbh Tray for receiving foodstuffs and a process and apparatus for producing it
US4964507A (en) * 1989-11-28 1990-10-23 Hanks Chen Packing cases for frozen shrimps
US6082529A (en) * 1997-08-07 2000-07-04 Armtec Defense Products Co. Ammunition packaging
US20060032391A1 (en) * 2004-08-13 2006-02-16 Brune Neal W Pyrotechnic systems and associated methods
WO2006041323A3 (fr) * 2004-10-15 2006-06-01 Foodcap Int Ltd Procedes et appareils de regulation thermique de produits perissables
US20070289474A1 (en) * 2006-04-07 2007-12-20 Armtec Defense Products Co. Ammunition assembly with alternate load path
US20080038417A1 (en) * 2004-10-15 2008-02-14 Foodcap International Limited Method of Preparing Cuts of Meat
US20080110902A1 (en) * 2004-10-15 2008-05-15 Roger Keith Palmer Container, Lid and Clip Therefor
US20080166460A1 (en) * 2004-10-18 2008-07-10 Foodcap International Limited Methods and Apparatus for Processing Perishable Products
US20080188977A1 (en) * 2004-10-18 2008-08-07 Foodcap International Lmited Processing, Storage And Distribution System For Perishable Food Products
US20080292759A1 (en) * 2004-10-18 2008-11-27 Roger Keith Palmer Apparatus and Method for Processing and Distribution of Peishable Food Products
US20090063166A1 (en) * 2004-07-20 2009-03-05 Food Cap International Limited Product Distribution Methods and Apparatus
US20100274544A1 (en) * 2006-03-08 2010-10-28 Armtec Defense Products Co. Squib simulator
US8146502B2 (en) 2006-01-06 2012-04-03 Armtec Defense Products Co. Combustible cartridge cased ammunition assembly
US8893917B1 (en) * 2012-03-07 2014-11-25 Camco Manufacturing, Inc. Overflow pan for a water heater and method
USD759479S1 (en) * 2015-02-20 2016-06-21 World Centric Container
CN107326750A (zh) * 2017-08-15 2017-11-07 吉特利环保科技（厦门）有限公司 一种纸浆模塑的注浆装置及其注浆方法
US11220376B2 (en) * 2014-10-21 2022-01-11 Creative Plastic Concepts, Llc Container lid with surface features and connecting bridges
US11345529B2 (en) * 2018-06-22 2022-05-31 Tricorbraun Inc. Packaging insert for individual containers
US12060682B2 (en) 2018-07-19 2024-08-13 Celwise Ab Laminated structure and method of its production

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4113650A1 (de) * 1991-04-26 1992-10-29 Jens Kaupert Verpackungsteil und herstellungsverfahren
JP2000345500A (ja) 1999-06-02 2000-12-12 Kao Corp 抄紙用型
CN113863057B (zh) * 2021-09-03 2022-08-02 珠海格力电器股份有限公司 加热模具

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US3682365A (en) * 1971-01-27 1972-08-08 Diamond Int Corp High strength open bottom meat container
US3698623A (en) * 1970-07-09 1972-10-17 Diamond Int Corp Open bottom meat container
US3718274A (en) * 1972-04-24 1973-02-27 Diamond Int Corp High strength open bottom packaging trays
US3756492A (en) * 1972-05-24 1973-09-04 Diamond Int Corp High strength open bottom packaging tray
US3764057A (en) * 1972-08-14 1973-10-09 Diamond Int Corp High strength open bottom packaging tray
US3845896A (en) * 1973-01-31 1974-11-05 Keyes Fibre Co Open bottom tray with multiple pedestal display platform

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Publication number Priority date Publication date Assignee Title
US3698623A (en) * 1970-07-09 1972-10-17 Diamond Int Corp Open bottom meat container
US3682365A (en) * 1971-01-27 1972-08-08 Diamond Int Corp High strength open bottom meat container
US3718274A (en) * 1972-04-24 1973-02-27 Diamond Int Corp High strength open bottom packaging trays
US3756492A (en) * 1972-05-24 1973-09-04 Diamond Int Corp High strength open bottom packaging tray
US3764057A (en) * 1972-08-14 1973-10-09 Diamond Int Corp High strength open bottom packaging tray
US3845896A (en) * 1973-01-31 1974-11-05 Keyes Fibre Co Open bottom tray with multiple pedestal display platform

Cited By (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2340247A1 (fr) * 1976-02-03 1977-09-02 Keyes Fibre Co Plateau pour la presentation et l'emballage de viande fraiche et autres aliments
US4162759A (en) * 1977-12-30 1979-07-31 Diamond International Corporation Food packaging tray
US4442969A (en) * 1983-04-28 1984-04-17 Mobil Oil Corporation Reinforced packaging tray
US4702377A (en) * 1984-11-20 1987-10-27 Lin Tec Verpackungstechnik Gmbh Tray for receiving foodstuffs and a process and apparatus for producing it
USRE33143E (en) * 1984-11-20 1990-01-09 Lin Tec Verpackungstechnik Gmbh Tray for receiving foodstuffs and a process and apparatus for producing it
US4964507A (en) * 1989-11-28 1990-10-23 Hanks Chen Packing cases for frozen shrimps
US6082529A (en) * 1997-08-07 2000-07-04 Armtec Defense Products Co. Ammunition packaging
US20090063166A1 (en) * 2004-07-20 2009-03-05 Food Cap International Limited Product Distribution Methods and Apparatus
US9950835B2 (en) 2004-07-20 2018-04-24 Foodcap International Limited Product distribution methods and apparatus
US20060032391A1 (en) * 2004-08-13 2006-02-16 Brune Neal W Pyrotechnic systems and associated methods
US20090223402A1 (en) * 2004-08-13 2009-09-10 Brune Neal W Pyrotechnic systems and associated methods
US7363861B2 (en) 2004-08-13 2008-04-29 Armtec Defense Products Co. Pyrotechnic systems and associated methods
US20080038417A1 (en) * 2004-10-15 2008-02-14 Foodcap International Limited Method of Preparing Cuts of Meat
US20080110902A1 (en) * 2004-10-15 2008-05-15 Roger Keith Palmer Container, Lid and Clip Therefor
US8317052B2 (en) 2004-10-15 2012-11-27 Foodcap International Limited Container, lid and clip therefor
WO2006041323A3 (fr) * 2004-10-15 2006-06-01 Foodcap Int Ltd Procedes et appareils de regulation thermique de produits perissables
US9097452B2 (en) 2004-10-15 2015-08-04 Foodcap International Limited Methods and apparatus for thermal regulation of perishable products
US20080166460A1 (en) * 2004-10-18 2008-07-10 Foodcap International Limited Methods and Apparatus for Processing Perishable Products
US20080188977A1 (en) * 2004-10-18 2008-08-07 Foodcap International Lmited Processing, Storage And Distribution System For Perishable Food Products
US20080292759A1 (en) * 2004-10-18 2008-11-27 Roger Keith Palmer Apparatus and Method for Processing and Distribution of Peishable Food Products
US8807038B1 (en) 2006-01-06 2014-08-19 Armtec Defense Products Co. Combustible cartridge cased ammunition assembly
US8146502B2 (en) 2006-01-06 2012-04-03 Armtec Defense Products Co. Combustible cartridge cased ammunition assembly
US20100274544A1 (en) * 2006-03-08 2010-10-28 Armtec Defense Products Co. Squib simulator
US20070289474A1 (en) * 2006-04-07 2007-12-20 Armtec Defense Products Co. Ammunition assembly with alternate load path
US20120291652A1 (en) * 2006-04-07 2012-11-22 Armtec Defense Products Co. Ammunition assembly with alternate load path
US8430033B2 (en) * 2006-04-07 2013-04-30 Armtec Defense Products Co. Ammunition assembly with alternate load path
US8136451B2 (en) 2006-04-07 2012-03-20 Armtec Defense Products Co. Ammunition assembly with alternate load path
US20110192310A1 (en) * 2006-04-07 2011-08-11 Mutascio Enrico R Ammunition assembly with alternate load path
US7913625B2 (en) 2006-04-07 2011-03-29 Armtec Defense Products Co. Ammunition assembly with alternate load path
US8893917B1 (en) * 2012-03-07 2014-11-25 Camco Manufacturing, Inc. Overflow pan for a water heater and method
US11220376B2 (en) * 2014-10-21 2022-01-11 Creative Plastic Concepts, Llc Container lid with surface features and connecting bridges
USD759479S1 (en) * 2015-02-20 2016-06-21 World Centric Container
CN107326750A (zh) * 2017-08-15 2017-11-07 吉特利环保科技（厦门）有限公司 一种纸浆模塑的注浆装置及其注浆方法
CN107326750B (zh) * 2017-08-15 2023-11-21 吉特利环保科技（厦门）有限公司 一种纸浆模塑的注浆装置及其注浆方法
US11345529B2 (en) * 2018-06-22 2022-05-31 Tricorbraun Inc. Packaging insert for individual containers
US12060682B2 (en) 2018-07-19 2024-08-13 Celwise Ab Laminated structure and method of its production

Also Published As

Publication number Publication date
ZA751333B (en) 1976-02-25
JPS512577A (en) 1976-01-10
AT341941B (de) 1978-03-10
CH590761A5 (fr) 1977-08-31
IL52653A0 (en) 1977-10-31
ATA232775A (de) 1977-06-15
DE2516412B2 (de) 1978-09-28
IL46769A (en) 1978-07-31
CA1021734A (fr) 1977-11-29
GB1484439A (en) 1977-09-01
IL46769A0 (en) 1975-05-22
SE7502429L (sv) 1975-12-22
LU72775A1 (fr) 1976-04-13
FR2275368A1 (fr) 1976-01-16
ES232134Y (es) 1978-06-01
NL7504209A (nl) 1975-12-23
BR7503916A (pt) 1976-07-06
DK114775A (da) 1975-12-22
ES232134U (es) 1978-01-16
NO751240L (fr) 1975-12-23
DE2516412A1 (de) 1976-01-08
DE2516412C3 (de) 1979-06-13
BE830056A (fr) 1975-12-10
GB1484440A (en) 1977-09-01
ES435593A1 (es) 1977-03-16
IT1034443B (it) 1979-09-10
AU475176B2 (en) 1976-08-12
AU7909875A (en) 1976-08-12

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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