US3305438A - Pulp partition molding and pressing - Google Patents

Pulp partition molding and pressing Download PDF

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Publication number
US3305438A
US3305438A US485966A US48596665A US3305438A US 3305438 A US3305438 A US 3305438A US 485966 A US485966 A US 485966A US 48596665 A US48596665 A US 48596665A US 3305438 A US3305438 A US 3305438A
Authority
US
United States
Prior art keywords
side walls
pressing
pockets
container
pulp
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
US485966A
Other languages
English (en)
Inventor
Kenneth L Crabtree
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.)
Keyes Fibre Corp
Original Assignee
Keyes Fibre Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US416740A external-priority patent/US3243095A/en
Application filed by Keyes Fibre Corp filed Critical Keyes Fibre Corp
Priority to US485966A priority Critical patent/US3305438A/en
Priority to SE15333/65A priority patent/SE311862B/xx
Priority to DK622765AA priority patent/DK111402B/da
Priority to DE19651436945 priority patent/DE1436945A1/de
Priority to BE673351A priority patent/BE673351A/xx
Priority to NO160810A priority patent/NO119711B/no
Priority to NL6515863A priority patent/NL6515863A/xx
Priority to FR41155A priority patent/FR1457905A/fr
Publication of US3305438A publication Critical patent/US3305438A/en
Application granted granted Critical
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
    • D21J5/00—Manufacture of hollow articles by transferring sheets, produced from fibres suspensions or papier-mâché by suction on wire-net moulds, to couch-moulds
    • 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
    • B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
    • B65D85/30—Containers, packaging elements or packages, specially adapted for particular articles or materials for articles particularly sensitive to damage by shock or pressure
    • B65D85/32—Containers, packaging elements or packages, specially adapted for particular articles or materials for articles particularly sensitive to damage by shock or pressure for eggs
    • B65D85/322—Trays made of pressed material, e.g. paper pulp
    • 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
    • B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
    • B65D85/30—Containers, packaging elements or packages, specially adapted for particular articles or materials for articles particularly sensitive to damage by shock or pressure
    • B65D85/32—Containers, packaging elements or packages, specially adapted for particular articles or materials for articles particularly sensitive to damage by shock or pressure for eggs
    • B65D85/324—Containers with compartments made of pressed material
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
    • D21J3/00—Manufacture of articles by pressing wet fibre pulp, or papier-mâché, between moulds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
    • D21J7/00—Manufacture of hollow articles from fibre suspensions or papier-mâché by deposition of fibres in or on a wire-net mould

Definitions

  • the height of the double walled ribs has heretofore been limited in a manner inappropriate for the most desirable egg packaging conditions. If the rib walls which must include the reasonable draft angle are beyond a given height, the eggs will not be bunched sulficiently close to one another to maintain the required outer carton dimension; whereas, if the ribs are made sufficiently low to permit the desired close packaging of eggs, the ribs because of their required draft angle do not extend high enough to separate the eggs one from another at their zone of maximum girth.
  • the increased density of the upper or tail portion of the inverted Y-shaped partition structure of this invention is desirable to achieve improved memory or resiliency of the pulp itself.
  • Partition structure which is contacted from both sides by eggs in adjacent pockets encounters more compressive effect from the eggs than other portions of the carton.
  • single thickness partition structure is formed of pulp having an average density value, continued pressure from opposite sides, especially when such cartons are reused time and time again, the pulp eventually assumes a compressed state forming undesirable inwardly contoured depressions.
  • Another object of the present invention is to provide apparatus for molding improved partition structure of inverted Y-shaped crosssectional configuration wherein one aftei-pressing die is characterised by roller devices positioned to press upper portions of double walled rib structure together in a manner which obtains a desired constant or uniform thickness dimension throughout the full vertical height of the pressed together portions.
  • FIG. 2 is a transverse sectional elevational view showing a portion of a molded pulp container positioned between closed afterpressing apparatus:
  • FIG. 4 is a sectional elevational view on line 4-4 of FIG. 2 showing further details of the container and the after-pressing apparatus;
  • FIG. 5 is a plan view of an egg carton or container embodying the partition structure of this invention.
  • FIG. 7 is a transverse sectional elevational view of several egg cartons stacked in mutually nested relationship.
  • FIGS. 3, 5, 6 and 7 the improved partition structure for containers is illustrated for convenience in combination with a preferred variety of 2 x 6 egg carton 10 best illustrated in FIGS. 3, 5, 6 and 7.
  • a carton 10 is composed of molded fibrous pulp material and comprises a pair of side walls 12 and end walls 14 secured together at the four corners of the generally elongated rectangular tray.
  • a plurality of vertically extending indentations taking the form of partial posts 16 are formed at the corners and along the sides and ends of the carton as integral portions of the side and end walls to increase the vertical strength of the walls as well as to partially define article receiving pockets P in the container.
  • the side walls 12 and end walls 14 are integrally connected at their bottoms with horizontally disposed base or bottom pocket walls 18 at spaced locations between the partial posts 16.
  • Extending longitudinally along the mid-portion of the carton as well as laterally of the carton are a plurality of partition structures 20.
  • the laterally extending partition structures 20 are connected at one end to a partial post 16 positioned marginally of the tray, and are connected at their other end with a series of alternately arranged high center posts 22 and low center posts 24.
  • the longitudinally extending partition structures 20 are connected between the high and low center full posts 22 and Mt
  • the partition structures 20 are integrally connected at their bottoms with the base or bottom walls 18 of the pockets to slope upwardly and outwardly therefrom.
  • each pair of adjacent pockets P is separated by partition structure comprising a pair of upwardly converging pocket side walls or rib walls 26 which are joined together at their upper portions.
  • the upper joined together portions of the converging walls 26 of each partition structure preferably have a midportion which extends at least to a height sufficient to separate eggs placed in the pockets at the point or zone of maximum girth of the eggs.
  • the upwardly extending portions include an upper edge 28 as well as end edges 30 joined at their lower extremities to the upper portion of the rib walls 26 where the rib walls are joined together as at 32 on opposite ends of the upstanding mid-portion.
  • the lower joined together portions 32 merge integrally with the partial post structure along the outer margin of the carton, or with the low post or high post structure along the longitudinal centerline of the carton.
  • the partition wall 36 comprises two adjacent layers 38 and 40 which conveniently may be integrally joined together at their tops as at 42, the two adjacent layers 38 and 40 being integral with their respective pocket side walls 26. Additionally, it will be noted that the portion 36 of uniform thickness is bounded at least partially on the lateral ends thereof by thickened partition wall structure in the edge zones 30.
  • a first after-pressing die 48 and a second afterpressing die 50 are mounted for relative to-andfro motion in a conventional manner, not shown, to permit placement of a partly formed egg carton between the dies prior to movement of the dies toward each other.
  • the afterpressing die 48 includes a cavity 52 designed to loosely receive the exterior of the egg carton in the shape it is received from the conventional drying apparatus. Additionally, the cavity 52 includes central upstanding projections 54 which do not mate with the outside or lower surface of the partly formed carton ribs. The projections 54 taper to a sharp ridge at their upper extremity, and are designed to conform with the desired shape of the lower or outer side of the partition structure of the tinished carton.
  • Exhaust ports 56 may be provided in the conventional fashion for expelling after-pressed egg cartons from the cavity 52.
  • the pocket forming protrusions 58 may be formed as separate segments secured as at 62 to the main portion of the upper dic 50.
  • a cavity arrangement 64 may be provided for positioning a plurality of shiftably mounted pressing elements such as roller devices 66.
  • Each roller device 66 is provided with central axially extending trunnion pins 68 adapted to be rotatably received in split bearing apertures 70 machined into the upper after-pressing die at the separation plane where the pocket forming protrusions 58 are secured to the upper main portion of the die.
  • the outer surface of the rollers 66 are cylindrical in the main, and include beveled or chamfered end portions 72.
  • an egg carton blank or partially finished container B is formed as a sheet or blanket of fibrous pulp material on an open-face suction die, not shown, in accordance with well-known procedures.
  • the suction or forming die is contoured so that the partition structure of the container blank B is formed as indicated in FIG. 1 with the converging rib or pocket side wall portions 26' angling upwardly to the uppermost zone of juncture 42'.
  • the walls 26' when the carton blank is in this state of completion are separated throughout their full vertical extent, except if preferred at the uppermost zone of juncture 42', and are angled to permit easy separation from the contoured forming die. As such, the walls 26 of the partition structure would be too greatly spaced from each other to permit storage of full size eggs in the adjacent pockets.
  • the drying apparatus may conveniently be of any known variety, such as a flat dryer belt or a shaped drying form without a mating form on the reverse side of the article.
  • the carton blank B may conveniently be drawn by suction connected to the ports 56 to settle the carton blank into the cavity 52, as indicated in FIG. 1. In this position, the walls 36' of the partition structure are spaced from the upstanding central ridge formations 54, especially at the upper portions thereof.
  • the upper after-pressing die 50 and the lower after-pressing die 48 move relatively together.
  • the depending pocket forming protrusions 58 engage the already roughly formed downwardly dished pockets of the carton blank.
  • the pockets are enlarged by laterally pressing paired walls 26' together, and the roller elements 66 engage the central upstanding rnid-portions of the partition structure.
  • the roller elements 66 compress the upper portions of the rib or pocket side walls together to achieve the layered effect indicated at 38 and 40 in FIG. 3.
  • the component of laterally inward pressing force is multiplied relative to the component of downward rib crushing force so the effective height of the partition wall is maintained without significantly increasing the normal after-pressing force.
  • the portion of the pocket forming protrusions 58 immediately below the location of the roller devices 66 serves to after-press the lower portion of the rib or pocket side walls 26 against the upstanding central tapered portion 56.
  • the egg cartons 10 of this invention including the single thickness upstanding partition wall 36 may be nested compactly one within another for shipment to the egg packager. While suitable anti-jamming or de-nesting stops, not shown, ordinarily are provided in the upper portions of the partial post formations to prevent cartons from nesting to the point where their steep walls will frictionally engage to the extent where serious jamming would occur, it will be noted that the laminations 38, 40 of the partition wall 36 of this invention may spread slightly to receive the upper portion 28 of the partition wall 36 of the next lower carton in a stack, if required. Upon removal of each carton from the stack, the after-pressed partition wall 36 will resume its proper configuration of uniform or constant thickness throughout its full vertical extent.
  • the cartons Upon arrival at the egg packagers, the cartons are denested from the stack and the downwardly dished pockets P filled with eggs in the conventional fashion.
  • the side and end walls of the illustrated carton extend beyond the full vertical height of the eggs.
  • the partition portions 36 extend at least to the point or zone of maximum horizontal girth of the eggs. Additionally, whether the point of maximum girth on a given egg is near the high or the low end of the ordinarily encountered range of such heights, the thickness of the partition portion at that point is exactly the same, as desired.
  • the increased density of the partition structure is at the point which is contacted on opposite sides by eggs in adjacent pockets. The increased density defeats permanent compression and deformation of pulp fibers in this zone to maintain desired minimum spacing between eggs while retaining the desired cushioning characteristics long associated with molded pulp.
  • the after-pressing die includes a plurality of pocket forming protrusions, one for each pocket of the container, a cavity in each protrusion, and pressing elements mounted in each cavity so that a pair of pressing elements is provided for each side wall between adjacent pockets.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Packaging Frangible Articles (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
US485966A 1964-12-08 1965-08-02 Pulp partition molding and pressing Expired - Lifetime US3305438A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US485966A US3305438A (en) 1964-12-08 1965-08-02 Pulp partition molding and pressing
SE15333/65A SE311862B (de) 1964-12-08 1965-11-26
DK622765AA DK111402B (da) 1964-12-08 1965-12-03 Støbt bakke af fibret papirmasse samt fremgangsmåde og apparat til fremstilling af bakken.
DE19651436945 DE1436945A1 (de) 1964-12-08 1965-12-04 Behaelter aus geformtem Papierstoff und Verfahren und Vorrichtung zu seiner Herstellung
BE673351A BE673351A (de) 1964-12-08 1965-12-06
NO160810A NO119711B (de) 1964-12-08 1965-12-07
NL6515863A NL6515863A (de) 1964-12-08 1965-12-07
FR41155A FR1457905A (fr) 1964-12-08 1965-12-07 Carton moulé et son procédé de fabrication

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US416740A US3243095A (en) 1964-12-08 1964-12-08 Pulp partition molding
US485966A US3305438A (en) 1964-12-08 1965-08-02 Pulp partition molding and pressing

Publications (1)

Publication Number Publication Date
US3305438A true US3305438A (en) 1967-02-21

Family

ID=27023464

Family Applications (1)

Application Number Title Priority Date Filing Date
US485966A Expired - Lifetime US3305438A (en) 1964-12-08 1965-08-02 Pulp partition molding and pressing

Country Status (8)

Country Link
US (1) US3305438A (de)
BE (1) BE673351A (de)
DE (1) DE1436945A1 (de)
DK (1) DK111402B (de)
FR (1) FR1457905A (de)
NL (1) NL6515863A (de)
NO (1) NO119711B (de)
SE (1) SE311862B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013038337A3 (en) * 2011-09-13 2013-06-20 Brødrene Hartmann A/S A display and distribution package for eggs
US9682811B2 (en) 2012-08-21 2017-06-20 Brødrene Hartmann A/S Package for eggs and method for manufacturing said package
EP3251973B1 (de) 2012-05-03 2020-07-08 Brødrene Hartmann A/S Ein verfahren zur herstellung einer eierverpackung
WO2023043879A1 (en) * 2021-09-15 2023-03-23 Becton, Dickinson And Company Sustainable and recyclable pulp tray for blood collection tubes

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3563446A (en) * 1969-06-12 1971-02-16 Mobil Oil Corp Molded egg carton structure

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3123519A (en) * 1964-03-03 Molded pulp egg carton method

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3123519A (en) * 1964-03-03 Molded pulp egg carton method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013038337A3 (en) * 2011-09-13 2013-06-20 Brødrene Hartmann A/S A display and distribution package for eggs
US10000332B2 (en) 2011-09-13 2018-06-19 Brødrene Hartmann A/S Display and distribution package for eggs
EP3251973B1 (de) 2012-05-03 2020-07-08 Brødrene Hartmann A/S Ein verfahren zur herstellung einer eierverpackung
US9682811B2 (en) 2012-08-21 2017-06-20 Brødrene Hartmann A/S Package for eggs and method for manufacturing said package
WO2023043879A1 (en) * 2021-09-15 2023-03-23 Becton, Dickinson And Company Sustainable and recyclable pulp tray for blood collection tubes

Also Published As

Publication number Publication date
DK111402B (da) 1968-08-12
NL6515863A (de) 1966-06-09
BE673351A (de) 1966-06-06
FR1457905A (fr) 1966-11-04
DE1436945A1 (de) 1968-11-21
SE311862B (de) 1969-06-23
NO119711B (de) 1970-06-22

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