US3185370A - Molded pulp egg carton - Google Patents

Molded pulp egg carton Download PDF

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US3185370A
US3185370A US231436A US23143662A US3185370A US 3185370 A US3185370 A US 3185370A US 231436 A US231436 A US 231436A US 23143662 A US23143662 A US 23143662A US 3185370 A US3185370 A US 3185370A
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Prior art keywords
post
egg
carton
cell
article
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US231436A
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English (en)
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Richard F Reifers
Henry A Lord
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Diamond International Corp
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Diamond International Corp
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Priority to NL255456D priority Critical patent/NL255456A/xx
Priority to LU38891D priority patent/LU38891A1/xx
Priority to DED34144A priority patent/DE1293013B/de
Priority to CH1023560A priority patent/CH387431A/de
Application filed by Diamond International Corp filed Critical Diamond International Corp
Priority to US231436A priority patent/US3185370A/en
Application granted granted Critical
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    • 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
    • B65D85/324—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
    • D21J7/00—Manufacture of hollow articles from fibre suspensions or papier-mâché by deposition of fibres in or on a wire-net mould

Definitions

  • FIGA - 1NVE1-rroRS Richard E Refers 8 Henry A. Lord BY Mez. 0, 7/.acw
  • the present invention relates to an egg carton or similar article made of molded pulp.
  • the article is formed by being molded onto a mold that has suction applied to one side thereof and is immersed in a slurry that is made up of wood and/ or paper fibers and water, the bers lbeing sucked up by the suction applied to the mold and held by a screen thereon that is in the shape of the article to be made; the water passes through the screen and is exhausted.
  • the article is transferred in the first process to a support that is generally planar and passes through a heating means, such as an oven. This -is known as free drying. Where a higher quality product is desired, the free-dried articles may be hot pressed between mating pressing dies, and this may or may not be accompanied by a spraying of the article.
  • the article is molded or formed as above stated, but is transferred after being molded on-to a form and it is on this form that it passes through the oven or other heating means; the form may or may not be heated itself either in addition to or as -a substitute for the oven type heating means.
  • the article is transferred to mat-ing pressing dies as above described. This process is known as the form drying process.
  • the after-pressing which is lthe pressing that takes place after the molding or forming of the article, is -for the purpose of restoring the articles shape to that it originally had and hence was recognized as a correcting or reotifying step in wh-ich little or no changeV was made in the actual coniiguration of the article, such changes as were made being largely for producing only surface effects on the articles.
  • the carton may be handled in automatic machinery and may protect the eggs, or other fragile articles, from shock and other forces that arise during the handling of the lilled carton both in automa-tic closing and sealing machinery and in Ithe transporting of the lled carton from piace to place during the marketing operations,
  • the carton In addition to the strength characteristics, the carton must not be hard and unyielding for if it were, the eggs would be subjected to impact shocks that would tend to cause egg breakage. Consequently, it is desirable that those parts of the carton that are in contact with the egg or other fragile object possess a certain amount of softness and/or resiliency so that ⁇ the shocks will be cushioned and their effect mitigated to thus reduce or avoid egg breakage.
  • Modiiication of the configuration of an egg carton finds one application in the manufacture of egg cartons of a size to hold very small eggs known as the pullet size.
  • Pullet eggs are laid by new layers, and the season is generally heavier in July and August, although with the recently adopted practicerof rotating flocks, seasonal increases in pullet eggs are less pronounced than formerly.
  • Modification of the coniiguration of an egg carton finds another application in the manufacture of egg cartons having a cellular bottom section and a cover section with a planar top and posts to support the planar top of the cover section.
  • An object of the present invention is to provide a novel molded pulp egg carton that has a configuration which will protect the eggs from accidental breakage, and which has a unique structure Ito afford extreme structural strength.
  • Another object of the present invention is to provide a novel egg carton in which a cellular tray includes hollow posts which will provide4 columnar strength and including intermediate cushioning portions of a consistency and thickness differing from those portions subject to vertical loading.
  • a further object of the present invention is to provide a molded pulp egg carton that will reduce egg rattle and egg breakage and Which affords good nesting.
  • Another object of the present invention is the provision of an egg carton that combines characteristics of high strength with characteristics of positively holding the egg in parts -thatrcushion the egg against shock.
  • Yet another object of the present invention is to provide an egg carton providing a soft and gentle support for longeggs at the bottom of the cell.
  • FIG. 1 Ishows schematically apparatus for producing the egg cartons of the invention
  • FIG. 2 is a cross-sectional view, with parts in elevation, of a forming die used for forming a preform used to produce the novel egg carton, with a preform thereon;
  • FIG. 3 is an elevation of a drying form
  • FIG. 4 is a view showing, in stepped sections, pressing dies used to reform the carton
  • -IG. 4a illustrates the relative dimensions and shapes of a portion of the preform posts before and after treatment in the pressing dies of FIG. 4;
  • FIG. 4b is a cross sectional view showing the pressing dies of FIG. 4 with a pressed and reformed preform therebetween;
  • FIG. 5 is a cr-oss-section, taken generally on line 5-5 of FIG. 6, of the novel egg carton after being reformed in the dies of FIG. 4 and showing the article in a closed condition;
  • FIG. 6 is a fragmentary plan view of the open egg carton of FIG. 5;
  • FIG. 7 is a fragmentary elevational view of a single egg cell of the carton shown in FIG. 6;
  • FIG. 8 is a cross-sectional view taken on the line 8 3 of FIG. 7;
  • FIG. 9 is a fragmentary plan View similar to FIG. 6 of the bottom section of another embodiment of egg carton in accordance with the present invention.
  • FIG. 10 is a cross-sectional view taken on the line Iii-10 of FIG. 9;
  • FIG. 11 is a view similar to FIG. 10 and showing an egg in the cell thereof;
  • FIG. 12 is a fragmentary plan view similar to FIGS. 6 and 9 of the bottom section of still another embodiment of egg carton in accordance with the present invention.
  • FIG. 13 is an elevational view of an egg cell of the bottom section shown in FIG. 12;
  • FIG. 14 is a cross-sectional view taken on the line .I4-14 of FIG. 13;
  • FIG. 15 is a cross-sectional view taken on the lines I5-15 of FIG. 12;
  • FIG. 16 is a view similar to FIG. 15 and showing an egg in the cell thereof;
  • FIG. 17 is a fragmentary plan view similar to FIGS. 6, 9 and 12 of the bottom section of a still further embodiment of egg carton in accordance with the invention.
  • FIG. 18 is an elevational view of an egg cell of the bottom section shown in FIG. 17;
  • FIG. 19 is a fragmentary vertical section taken substantially on the line I9-19 of FIG. 17;
  • FIG. 20 is a cross-sectional view taken on the line Ztl-20 of FIG. 19;
  • FIG. 21 is a plan view of another embodiment of egg cell in accordance with the present inventory.
  • FIG. 22 is a fragmentary plan view similar to FIGS. 6, 9, 12 and 17 of yet another egg carton made in accordance with the present invention and on a slightly reduced scale;
  • FIG. 23 is a cross-sectional view taken on the line 23-23 of FIG. 22;
  • FIG. 24 is a cross-sectional View taken on the line 24-24 of FIG. 22;
  • FIG. 25 is a plan View of an egg flat incorporating the novel cell construction of the present invention.
  • FIG. 26 is a cross-sectional view of the egg flat of FIG. 275, and showing a cover in place thereon.
  • FIG. l a preferred apparatus for producing the carton of the invention, and there may be seen therein a molding apparatus generally designated 20, this molding apparatus comprising in known manner a molding wheel 21 having on the periphery thereof a plurality of forming dies 22.
  • a tank 23 containing a pulp slurry is positioned beneath the wheel 2l so that the forming dies 22'will be immersed in the slurry as the wheel 21 revolves.
  • the preform When the preform has been formed on the forming die 22, it leaves the slurry and at this stage contains a great amount of water.
  • the wet preform A is removed from the die 22 and transferred to a drying form 26 that is carried by a conveyor 27.
  • the conveyor 27 extends through a drying apparatus, preferably a drying oven 28. After traversing the oven 28, the preform A is placed between pressing and reforming dies.
  • the pressing and reforming dies may be mounted as shown in FIG. 1 in a press 30 which carries mutually reciprocable mating dies 32 and '33.
  • the preform A is removed from the drying form 26, and at this stage, it will be understood that the preform A is formed and dried and that it usually has at this stage of its manufacturer a small amount of warpage.
  • the preform is transferred by known means to the press 30, and there is then effected a reciprocable movement of one or both of the dies 32'and 33 to cause them to come together to press and reform or reshape the preform A between them.
  • the preform after being dried is relatively rigid and brittle and the reforming and reshaping provides a soft finish to the carton, provide cushioning portions and structure aording increased protection for the eggs without radically affecting the strength of the carton.
  • the drying form 26, shown in FIG. 3, is of the same configuration as the die 22, and is preferably a male form, as shown.
  • the pressing and forming dies 32 and 33 shown in FIG. 4, have portions thereon which reform or reshape several parts of the carton bottom section.
  • the female die 32 has an upstanding post 34h that appears to be similar to the post 34a of the die 22.
  • Each post '34b has four sides, each of which conforms to the surface of an inclined cylinder, two such sides being :shown in FIG. 4.
  • the angle to the vertical of the sides of'post 34a of die 22 is less than the angle to the vertical of the sides of post 34th of the female pressing die 32. In practice, this difference is in the order of 2%.”
  • the height of post Sfib is the same as the height of post 34a, but the extent or area of the top of post 34a is greater than that of post 34h.
  • the male die y33 has a generally corresponding recess 34C, made up of four inclined sides which conform to the surface of cylinders; the sides of recess 34e have, however, protruding generally elliptical blisters Slf which have their greatest outward extension at the approximate midpoint thereof and -a-re each regularly curved therefrom.
  • the lblisters are in registry with corresponding areas of the article or carton preform A of reduced thickness relative to the normal Vthickness of the preform A.
  • the posts of the article are strengthened, andany inadvertent flaws are eliminated, -i.e., if the posts are formed excessively thin on the suction die, the crowded-in liber will compensate for such imperfections.
  • the areas of carton A registering with the blisters 34j are also reformed, due to the relative shapes of the forming die 22 and lthe pressing dies 32 and 33, particularly pressing die 33.
  • flute-like protrusions 3617 are provided on the wall of the egg cell cavity thereof; these protrusions Sb are of a generally elongated tear drop shape having downwardly tapering tails.
  • a shallow dent 36d of preferably circular configuration, is located ⁇ in the protrusion Seb, adjacent the upper end or head thereof.
  • a corresponding yflute-like indentation 36C is provided on the mating pyramidal male part of the die 33, there being a bulge 36e at the upper end thereof.
  • Pressing die 32 also has an annular protrusion 37b on the bottom of the cavity thereof, and the male die 33 has a protrustion 37C (see FIG. 4b) on the bottom of the mating pyramidal male part, protrusion 37e being surrounded -by a groove 38.
  • FIG. 4b there is shown a cross-sectional view, taken diagonally through an egg cell, and showing the article A being pressed and reformed in the pressing dies 32 and 33.
  • the blister 35i-f is seen pressing and reforming a side of a post 34, the post 34 being thinner than normal where it is in registry with blister 341.
  • This thinness is due in part to the fact that this blister area was initially formed thinner on the preform and in part to the fact that the blister area is later pressed thinner between the blister V3I-if and the underlying part of the post 34h of die 32.
  • the 4blister' forming areas on the preform are formed thinner due to blanking-out elements (not shown) disposed at corresponding portions of the forarninous forming die whereby the pulp liber of the slurry is not sucked through the die :but tends to build over this area.
  • the portions of :the hollow post extending from the base to the top thereof are of normal thickness Vduring formation of the preform and the concentration of material is increased thereat during inward reforming as mentioned above. This in effec-t increases the columnar strength of the posts.
  • the annular protrusion 37b of pressing die 32 cooperates with the protrusion 37C and groove 38 of pressing die 33, and the protrusion 35h and dent 36d cooperate with the flute-like indentation 36C and bulge 36e, respectively.
  • the resulting article A as shown in F-G. 5 is, of course, the original preform A that was formed on the die 2-2, but has been reformed in part to have flutes 36 that extend into the egg cells of the article A, the flutes 36 having flattened upper ends 36'.
  • Y button that was an upstanding protrusion on the bottom of the egg cell of Article A has been reformed into a -thin wafer 39 having a surrounding pillow 39. It will be understood that the position and dimension of wafer .3-9 with respect to the cell bottom, either higher, lower, thicker or thinner than that shown in FIG. 5, depends upon the existence and height of the protrusion 37b and 37C on the dies 32 and 3-3. Thus, the wafer 39 may appear other than as shown in FIG. 5.
  • the posts 34 extend upwardly into engagement withthe underside of planar top 35 of the integral cover section of carton A.
  • the molded pulp in the characteristics of that part of the article that'has been reformed.
  • the vreforming of the parts of the article that become the flute-like protrusion 36 and wafer 39 shown in FIG. 5 serves to distunb the entire body of fibers therein and the bond between the fibers.
  • the carton Abody portion as initially formed was concave, and is reformed to a convex configuration that is considerably softer and more yielding than the remaining nonreformed part of the article or carton A; i.e., the curvature is in a sense reversed.
  • the article or carton A retains its general over-all strength but is provided with finte-like protrusions 36 that possess completely different characteristics from the other (non-reformed) parts of the carton in that they -will yield more readily under load.
  • the reforming of an article is great enough in certain instances to cause the reformed part of the article to go to a point of opposite image; the originally formed article may, for example, have a part that is concave a certain amount, and that is convex a like amount after reforming.
  • the wafer 39 and pillows 39 are also soft and yielding, and serve to cushion any long eggs that come into Contact with them, and this formation will prevent leakage in the event of breakage.
  • the apparatus shown is the preferred apparatus for carrying out the process, it will be understood that other apparatus may also be used and that, in general, any apparatus that first forms an article and then reforms it after it has dried, preferably, is suitable.
  • the process may be carried out by an apparatus in which the pulp is first molded into a sheet, and then the article is initially formed from the sheet; thereafter, the article may be reformed in accordance with ⁇ the above teachings.
  • Other apparatus that are suitable for carrying out the process of the invention will be apparent tothose skilled in the art, only one of the apparatus having been shown in the drawings.
  • the egg carton bottom section 40 is an egg receiving section having egg receiving cells 41, each of the cells 41 having a square bottom 42, from the sides of which the lower wall portions 43 incline upwardly and outwardly at a predetermined angle to the vertical, thereby providing a generally polygonal lower portion of the cell.
  • the polygonal lower wall portions 43 merge upwardly with rounded, generally conical, upper cell portions 44, and these upper cell portions 44 are at a lesser angle to the vertical than the lower portions 43.
  • the cell as thus described is known in the art, and is fully described in Patent No. 2,771,233, which issued to J. W. Cox on November 20, 1956.
  • the reformed convex utes 36 From each corner of the base 42 there extends upwardly, and at an angle that is preferably but may be within the range of 10-15, the reformed convex utes 36. Flutes 36 have flattened upper ends 36 to provide a cell having more room for the egg than would be the case otherwise. In the bottom 42 there are the reformed wafers 39 and pillows 39.
  • FIG. 7 shows the appearance of an egg cell 41 from the outside thereof, and there may be seen the reverse, or concave, side of the flutes 36, as well as ⁇ the flattened upper ends 36' thereof, the flat lower wall portions 43 Y and the conical upper cell portions 44.V
  • FIG. 8 shows the thin and yielding egg-contacting area 34' in the post 34; the posts 34 in the regions on either side of the ⁇ area 34' being relatively thick and thus hav- ,the several walls diverge from eachother.
  • the posts 34 are therefore strong at the four regions where the sides of the post 34 join each other, and consequently have good columnar strength.
  • FIG. 8 There may also be seen in FIG. 8 the shape of the flutes36 as well as the flattened end 36 of one flute 36.
  • the elongated blisterformed areas 34 extend above and below the upper margin of the carton bottom section; see FIGS. 5 and 7.
  • the egg carton shown in FIG. 9 is generally similar to that shown in FIGS. 5 and 6, with the exception that there is not provided in this embodiment the posts 34 Ithat contact the underside of the cover of the carton. Instead, the posts are of normal height, i.e., they extend only as high as the highest part of the remainder of the bottom section.
  • the carton of FIG. 9 more closely resembles that carton which is disclosed in Cox Patent No. 2,771,233.
  • the carton of FIG. 9, as will be apparent, is one which is reformed from a carton that s molded in accordance with the Cox patent, and therefore does not require the production of or changeover to new molding dies in a plant having such dies for the production of the carton of the Cox patent.
  • the carton of FIG. 9V has a bottom egg receiving section with egg cells 41 that are the same as egg cells 41 of the bottom section shown in FIG. 6.
  • the bottom 42 with wafer 39 and pillow 39', the lower wall portions 43 and the upper cell portions 44.
  • the flutes 36 are of teardrop shape at their upper ends to facilitate the reforming of the material and have a relatively large radius.
  • the radius is important from considerations of flexibility, flexing of the material and the convergence of the flutes at the cell junctures.
  • FIG. 10 there may be seen the egg cell 41 having the two flutes 36 therein in full line position, the portions that formed the flutes 36 before the reforming of the carton bottom section 45 being shown in dotted lines.
  • Eggs placed in an egg cell 41 will lodge upon the flutes 36 therein, and as shown in FIG. 11 will deflect and depress the reformed flute 36 because of the softness and cushioning ability thereof.
  • the cushioning ability of the reformed flute 36 is such that an egg may be safely dropped into the cell 41, as is done in automatic egg carton filling machinery, without danger of egg breakage.
  • each cell acts independently, so that a heavier egg in one cell will cause the reformed utes thereof to deflect without having any effect on the eggs in adjacent cells or the adjacent cells themselves.
  • FIG. 12 a lower section of an egg carton, section 50 having a plurality of cells 51 each of which includes a horizontal base 52 that is substantially in the shape of an equilateral triangle, or regular trapezoid. Extending upwardly from each of the three edges of cell base 52 of each cell is a cell wall, there being therefore three walls 53, 54 and 55.
  • Each of the walls 53, 54 and 55 tapers in width perimetrically of the cell in extending upwardly towards the top of the carton bottom section. Also, each of the cell walls or lowermost portions inclines upwardly and outwardly from the base 52, so that Above the Walls 53, 54 and 55 ⁇ there are upper wall portions 53A, 54A and 55A that extend upwardly from the top of their respective lower Walls and at a lesser angle to the vertidal.
  • auxiliary walls 56, 57 and 53 Extending between the Walls above described and asshown on the drawing, there are auxiliary walls 56, 57 and 53, and these auxiliary walls are of substantially the same angle of inclination as the upper Wall portions 53A, 54A and 55A and extend upwardly from the apices of the triangular base 52, increasing in width from said apices.
  • Flutes 53B, 54B and 55B are reformed from the corresponding lower and upper walls 53, 53A, 54, 54A, and 55, 55A.
  • FIG. 13 shows the appearance of typical flute 54B in FIG. 13, and the protrusion of the utes 53B, 54B and 55B into the cell ⁇ 51 is clearly shown in FIG. 14.
  • FIG. v15 shows in dotted lines the position of the walls 53, 53A
  • FIG. 16 there may be seen cell 51 having the reformed flutes 53B and 54B, and it may be clearly seen that these reformed flutes have deflected in order to accommodate and receive in a cushioning manner the egg therein.
  • FIG. 17 there is shown a lower section 60 of an egg carton having a plurality of cells 61 each of which includes a horizontal base 62 that is substantially in the shape of a trapezoid. Extending upwardly from each of the four edges of cell base 62 of each cell is a cell wall, the four walls being designated 63, 64, 65, 66. As in the carton 50 of FIGS. 12, 13 and 14, each of these walls extends upwardly toward the top of the carton bottom section, and as in carton 50 each of the cell walls inclines upwardly and outwardly from the base 62 and diverges from each other wall.
  • Reformed flutes 67, 63, 69 and 70 may be seen in the upper parts of the cells 61.
  • no ute is adjacent the hinge 71, as results with the placement shown in FIGS. 12, 13 and 14.
  • FIG. 18 illustrates the appearance of the cell 61, in exterior elevation, and showing the reformed flutes 68 and 69, which are those flutes that are closest to the outer margins of the carton bottom section 60.
  • FIG. 19 shows the reformed liutes 67 and 70' that are closer to the interior of bottom section 60, these two views showing the relative spacing of these pairs of reformed flutes.
  • the utes 67 and 70 which are in the walls of the posts of bottom section 60, extend from adjacent the tops of the posts and terminate well above the bottom 62. These liutes 67 and 70 are thus relatively short.
  • FIG. 20 there may be seen the convex reformed utes 67, 68, 69 and 70, and the straight walls 63, 64, 65 and 66 of the cell 61 therebetween.
  • FIG. 21 shows a cell S0 that is generally similar to the cell 61, but has only two liutes 87 and 90 therein, corresponding to the utes 67 and 70 of the cell 61. This is a simpler cell which provides suitable cushioning support for the eggs.
  • FIGS. 22 and 23 there is shown a carton bottom section 100 similar to the carton bottom section 60 of FIG. 17, in that the cells 101 of this carton are of the generally triangular shape of the cells 61.
  • the cells 101 may be seen to comprise a generally triangular bottom 102 with the three main diverging and inclined walls 103, 104 and 105 rising therefrom.
  • the walls 104 are parts of a reformed post 106 which has a height sufiicient to Contact and support the underside of the carton cover, the height of post 106 being clearly shown in FIG. 23.
  • the underside of walls 104 and 105 of the posts 106 are thin in the area indicated at 107.
  • the thinned areas 107 are of generally tear drop shape and are positioned laterally intermediately of the walls 104 and 105. They extend from near the top of walls 104 and 105 to adjacent the level of the cell bottoms 102, and therefore are engaged by eggs placed in the cells. Because of the thinness of the areas 107, the walls 104 and 105 will deflect under the weight of an egg, and thus will yielding- Cal 10 ly cushion the egg. These areas are similar to the thinned areas 34 of the carton A, shown in FIGS. 5 to 9.
  • the triangular cell 101 may be utilized in an egg at for holding thirty-six eggs, as is shown in FIG. 25, wherein there may be seen the cells 101 each having a bottom 102 and the walls 103, 104 and 105, the latter forming the posts 106. There are three rows of posts 106, and'in addition there are two rows of posts 108, one row of posts 108 lying between each two rows of the posts 106.
  • the walls 104 and 10S of the posts 106 of the egg flat may also have Vthe thinned areas 107, as isV shown in FIG. 26, where there is also shown the posts 106 and 108.
  • a cover 109 having a planar top 110 and depending side walls 11,1 may be positioned on the egg tray, to protect eggs therein. The posts 106 and 108 will engage with and support the underside of the top 110 of the cover 109.
  • the egg liat of FIGS. 25 and 26 may be divided into groups of cells with each group containing only a few cells. Thus, each group may contain one dozen eggs, or a half-dozen eggs. Where a dozen eggs is tobe sold, the egg flat may be cut along a line of posts 108, and the cover 109 cut correspondingly.
  • the preform is irst or initially formed and lthen a part of the article is reformed and reshaped, and this part obtains thereby a softness and resiliency that it did not initially possess and which is not possessed by articles or cartons that are initially formed in the same conguration as the reformed article or carton hereof.
  • a one-piece molded container comprising a cellular bottom tray including an upper peripheral margin and a plurality of individual cell groups about a hollow, vertically extending post, said post terminating above the upper peripheral margin of said bottom tray, at least one of said cells comprising a plurality of vertically diverging walls spaced about a base, the hollow post having a side Vwall portion forming one of said diverging wall portions,
  • said vertically extending post including an upper terminal end portion engageable with an inner surface portion of said dished cover for absorbing vertical compressive forces transmitted to said cover when said container is closed; the improvement comprising a vertically disposed cushioning-area portion disposed intermediately of said post side wall portion between the upper terminal end thereof and said base and disposed in intersecting relationship with respect to a plane passing through the upper peripheral margin of said bottom tray, said cushioning-area portion being transversely thinner and of a different consistency than adjacent anking portions of said post side wall portion and having independent exibility with respect to said adjacent portions of said post, said adjacent portions of said post comprising a concentration of material from the top thereof flanking said cushioning-area portion down to said base for providing increased columnar strength to 1.1 said post and providing a stable base for the independent flexibility of said cushioning-area portion.
  • said vertically extending post has a truncated, pyramidal shape including four substantially planar sides, each of said planar ⁇ sides including one of said intermediate cushioning-area portions, the portions of said post exclusive of said cushioning-area portions comprising said concentration of pressed material from the terminal end portion of said post down to said base and at the intersections of said adjacent planar sides.
  • said convex horizontal cross section on said post side Wall p0rtion comprises a generally elliptical, vertically disposed geometric shape and being independently flexible With respect to said adjacent portions of said post side Wall por- Vtions'and being yieldable when engaged by an article deposited in the cell.

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US231436A 1959-10-05 1962-10-18 Molded pulp egg carton Expired - Lifetime US3185370A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
NL255456D NL255456A (da) 1959-10-05
LU38891D LU38891A1 (da) 1959-10-05 1960-06-29
DED34144A DE1293013B (de) 1959-10-05 1960-08-31 Faserstoffbehaelter fuer Eier u. dgl.
CH1023560A CH387431A (de) 1959-10-05 1960-09-09 Verfahren zum Herstellen von geformten Behältern aus Papierstoff sowie nach diesem Verfahren hergestellter Eierbehälter
US231436A US3185370A (en) 1959-10-05 1962-10-18 Molded pulp egg carton

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US84443859A 1959-10-05 1959-10-05
US231436A US3185370A (en) 1959-10-05 1962-10-18 Molded pulp egg carton

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US3185370A true US3185370A (en) 1965-05-25

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Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3234077A (en) * 1962-09-04 1966-02-08 Diamond Int Corp Method of forming a molded pulp egg carton
US3282458A (en) * 1963-12-24 1966-11-01 Diamond Int Corp Nestable egg trays
US3398875A (en) * 1966-12-30 1968-08-27 United Ind Syndicate Egg cartons
US3643855A (en) * 1969-12-10 1972-02-22 Container Corp Moulded container
US3674168A (en) * 1969-07-11 1972-07-04 Isap Spa Cupped trays made from a thin sheet of plastics material for round or pear-shaped fruits or horticultural products
JPS5077222U (da) * 1973-11-14 1975-07-04
JPS50141476A (da) * 1974-04-29 1975-11-13
US4088259A (en) * 1977-11-08 1978-05-09 Keyes Fibre Company Die-dried molded pulp egg carton
JPS5393326U (da) * 1971-02-22 1978-07-29
US4298156A (en) * 1980-06-20 1981-11-03 Diamond International Corporation Nestable and denestable molded egg cartons
US4382536A (en) * 1981-02-17 1983-05-10 Dolco Packaging Corporation Foam egg carton
US4419068A (en) * 1981-02-17 1983-12-06 Dolco Packaging Corporation Molding apparatus having a vented female mold member for forming foamed egg cartons
US4448344A (en) * 1982-09-01 1984-05-15 Diamond International Corporation Egg cell construction
US4465225A (en) * 1981-09-29 1984-08-14 Diamond International Corporation Construction of universal egg cell cushion
US5162123A (en) * 1991-05-10 1992-11-10 Dolco Packaging Corp. Spring-oriented rotary shear key for use in a mold
US5230943A (en) * 1991-11-29 1993-07-27 Pulptech Corporation Free-flowing dunnage of molded pulp
US5597073A (en) * 1994-01-13 1997-01-28 Dolco Packaging Corp. Trays for holding food products
US5900119A (en) * 1996-10-09 1999-05-04 E-Tech Products, Inc. Method of forming improved loose fill packing material from recycled paper
US6012583A (en) * 1998-09-15 2000-01-11 Tekni-Plex, Inc. Egg carton
US6276531B1 (en) 2000-03-01 2001-08-21 Pactiv Corporation Molded fiber nestable egg tray packaging system
US6488152B1 (en) * 1998-07-17 2002-12-03 Brodrene Hartmann A/S Package
EP1454847A1 (de) * 2003-03-06 2004-09-08 Omni-Pac Ekco GmbH & Co. KG Verpackungsmittel Eierverpackung mit semi-ovoiden Formvertiefungen
US20050145529A1 (en) * 2003-12-31 2005-07-07 Andrews Alan P. Egg carton
EP2184308A2 (en) 2008-11-06 2010-05-12 E. I. du Pont de Nemours and Company Aliphatic-aromatic polyesters, and articles made therefrom
US20110132791A1 (en) * 2008-06-03 2011-06-09 Huhtamaki Nederland B.V. Packaging unit
US20150266659A1 (en) * 2012-08-21 2015-09-24 Brødrene Hartmann A/S Package for eggs and method for manufacturing said package
CN108071051A (zh) * 2016-11-17 2018-05-25 天津昇达纸制品有限公司 一种造纸工艺

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US4746402A (en) * 1986-04-21 1988-05-24 Fel-Pro Incorporated Gasket forming process

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US2239499A (en) * 1938-04-21 1941-04-22 Mapes Cons Mfg Co Packing material
US2560847A (en) * 1947-06-03 1951-07-17 Chaplin Corp Molded fiber article
US2600130A (en) * 1945-12-03 1952-06-10 Shellmar Products Corp Egg carton
US2656945A (en) * 1949-01-06 1953-10-27 Jesse R Grant Egg tray and cover
US2771233A (en) * 1950-06-21 1956-11-20 Diamond Match Co Molded pulp carton
US2924368A (en) * 1957-07-01 1960-02-09 Diamond National Corp Egg carton
US2974847A (en) * 1957-10-24 1961-03-14 Diamond National Corp Packages or cartons for eggs and other fragile articles
US2978162A (en) * 1959-02-09 1961-04-04 Packaging Corp America Molded pulp carton
US3016176A (en) * 1960-09-16 1962-01-09 Diamond National Corp Molded pulp egg carton
US3028065A (en) * 1960-02-03 1962-04-03 Diamond National Corp Molded pulp egg carton
US3093286A (en) * 1961-01-24 1963-06-11 Mead Corp Molded foamed plastic egg carton
US3145896A (en) * 1962-09-19 1964-08-25 Diamond National Corp Divisible molded article

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US2587909A (en) * 1947-02-17 1952-03-04 Elizabeth M Sherman Molded pulp egg carton
US2756918A (en) * 1952-04-23 1956-07-31 Schwartzberg Louis Molded paper pulp egg carton
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US2082564A (en) * 1935-08-10 1937-06-01 Benoit Leon Filler package
US2239499A (en) * 1938-04-21 1941-04-22 Mapes Cons Mfg Co Packing material
US2600130A (en) * 1945-12-03 1952-06-10 Shellmar Products Corp Egg carton
US2560847A (en) * 1947-06-03 1951-07-17 Chaplin Corp Molded fiber article
US2656945A (en) * 1949-01-06 1953-10-27 Jesse R Grant Egg tray and cover
US2771233A (en) * 1950-06-21 1956-11-20 Diamond Match Co Molded pulp carton
US2924368A (en) * 1957-07-01 1960-02-09 Diamond National Corp Egg carton
US2924367A (en) * 1957-07-01 1960-02-09 Diamond National Corp Molded egg carton
US2974847A (en) * 1957-10-24 1961-03-14 Diamond National Corp Packages or cartons for eggs and other fragile articles
US2978162A (en) * 1959-02-09 1961-04-04 Packaging Corp America Molded pulp carton
US3028065A (en) * 1960-02-03 1962-04-03 Diamond National Corp Molded pulp egg carton
US3016176A (en) * 1960-09-16 1962-01-09 Diamond National Corp Molded pulp egg carton
US3093286A (en) * 1961-01-24 1963-06-11 Mead Corp Molded foamed plastic egg carton
US3145896A (en) * 1962-09-19 1964-08-25 Diamond National Corp Divisible molded article

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3234077A (en) * 1962-09-04 1966-02-08 Diamond Int Corp Method of forming a molded pulp egg carton
US3282458A (en) * 1963-12-24 1966-11-01 Diamond Int Corp Nestable egg trays
US3398875A (en) * 1966-12-30 1968-08-27 United Ind Syndicate Egg cartons
US3674168A (en) * 1969-07-11 1972-07-04 Isap Spa Cupped trays made from a thin sheet of plastics material for round or pear-shaped fruits or horticultural products
US3643855A (en) * 1969-12-10 1972-02-22 Container Corp Moulded container
JPS5393326U (da) * 1971-02-22 1978-07-29
JPS5077222U (da) * 1973-11-14 1975-07-04
JPS542531U (da) * 1974-04-29 1979-01-09
JPS50141476A (da) * 1974-04-29 1975-11-13
US4081123A (en) * 1974-04-29 1978-03-28 Diamond International Corporation Dual basis weight multi-walled egg carton end cells
US4088259A (en) * 1977-11-08 1978-05-09 Keyes Fibre Company Die-dried molded pulp egg carton
US4298156A (en) * 1980-06-20 1981-11-03 Diamond International Corporation Nestable and denestable molded egg cartons
US4382536A (en) * 1981-02-17 1983-05-10 Dolco Packaging Corporation Foam egg carton
US4419068A (en) * 1981-02-17 1983-12-06 Dolco Packaging Corporation Molding apparatus having a vented female mold member for forming foamed egg cartons
US4465225A (en) * 1981-09-29 1984-08-14 Diamond International Corporation Construction of universal egg cell cushion
US4448344A (en) * 1982-09-01 1984-05-15 Diamond International Corporation Egg cell construction
US5162123A (en) * 1991-05-10 1992-11-10 Dolco Packaging Corp. Spring-oriented rotary shear key for use in a mold
US5230943A (en) * 1991-11-29 1993-07-27 Pulptech Corporation Free-flowing dunnage of molded pulp
US5328568A (en) * 1991-11-29 1994-07-12 Pulptech Corporation Method and apparatus for manufacture of free-flowing dunnage of molded pulp
US5597073A (en) * 1994-01-13 1997-01-28 Dolco Packaging Corp. Trays for holding food products
US5900119A (en) * 1996-10-09 1999-05-04 E-Tech Products, Inc. Method of forming improved loose fill packing material from recycled paper
US6488152B1 (en) * 1998-07-17 2002-12-03 Brodrene Hartmann A/S Package
US6012583A (en) * 1998-09-15 2000-01-11 Tekni-Plex, Inc. Egg carton
US6276531B1 (en) 2000-03-01 2001-08-21 Pactiv Corporation Molded fiber nestable egg tray packaging system
EP1454847A1 (de) * 2003-03-06 2004-09-08 Omni-Pac Ekco GmbH & Co. KG Verpackungsmittel Eierverpackung mit semi-ovoiden Formvertiefungen
US20050145529A1 (en) * 2003-12-31 2005-07-07 Andrews Alan P. Egg carton
US7255231B2 (en) 2003-12-31 2007-08-14 Pactiv Corporation Egg carton
US20110132791A1 (en) * 2008-06-03 2011-06-09 Huhtamaki Nederland B.V. Packaging unit
EP2184308A2 (en) 2008-11-06 2010-05-12 E. I. du Pont de Nemours and Company Aliphatic-aromatic polyesters, and articles made therefrom
US20150266659A1 (en) * 2012-08-21 2015-09-24 Brødrene Hartmann A/S Package for eggs and method for manufacturing said package
US9682811B2 (en) * 2012-08-21 2017-06-20 Brødrene Hartmann A/S Package for eggs and method for manufacturing said package
CN108071051A (zh) * 2016-11-17 2018-05-25 天津昇达纸制品有限公司 一种造纸工艺

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DE1293013B (de) 1969-04-17
NL255456A (da)
CH387431A (de) 1965-01-31
LU38891A1 (da) 1960-08-29

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