Patent Publication Number: US-2023135314-A1

Title: Nestable trays with minimum axial spacing

Description:
RELATED APPLICATIONS 
     This application is a continuation-in-part of Ser. No. 17/513,704 filed Oct. 28, 2021, the disclosure of which is expressly incorporated herein by reference. 
    
    
     NOTICE OF COPYRIGHTS AND TRADE DRESS 
     A portion of the disclosure of this patent document contains material which is subject to copyright protection. This patent document may show and/or describe matter which is or may become trade dress of the owner. The copyright and trade dress owner has no objection to the facsimile reproduction by anyone of the patent disclosure as it appears in the Patent and Trademark Office patent files or records, but otherwise reserves all copyright and trade dress rights whatsoever. 
     BACKGROUND 
     Field 
     This disclosure relates to tray containers and, in particular, to tray containers that can be stacked in various orientations while maintaining a minimum axial spacing. 
     Description of the Related Art 
     One area where the use of tray containers has become widespread is in the food packaging industry, in particular for meat products. Accordingly, it is common for these food containers to serve as the end display package in which the product is presented for sale to the customer in a tray with plastic wrap over the top lip. Pressed tray containers have been used in numerous environments for many years, with the containers having a common configuration that allows nested stacking of the containers. Conventional pressed paperboard trays and plate containers, for example, may have downwardly and inwardly converging sidewalls that are contiguous with a flat bottom wall, and with a radially extending lip along its top edge. This configuration allows pressed plates or trays to be nested in a stack of trays of the same configuration after formation for shipping and prior to filling with food. 
     One useful characteristic of tray containers is the ability to stack with uniform axial spacing between the container parts so that while stacked, adjacent parts do not become jammed or wedged together. Maintaining uniform gap spacing is also important to allow high-speed automated packaging equipment to separate and position individual containers from a nested group for automatic filling. Various rib or lug structures have been employed with lids to provide the requisite spacing, see e.g., U.S. Pat. Nos. 4,826,039 and 5,377,861. 
     One means for maintaining container spacing includes molded lugs which project inwardly or outwardly relative to the floor or skirt walls and contact the next adjacent container to keep the two containers axially spaced. However, if the lugs in two adjacent containers are mirror images of each other when nested they also nest, thus defeating the purpose of the lugs. To solve that issue, the lugs may be formed in a non-symmetric fashion and adjacent trays rotated so that the lugs in each do not align. This is a cumbersome process which adds expense. 
     Despite numerous attempts at providing nesting tray containers which maintain a certain axial spacing, there remains a need for trays that do not need special handling and can be stacked in various orientations. 
     SUMMARY OF THE INVENTION 
     According to exemplary embodiments, trays are provided which may be nested and maintain a minimum spacing between individual trays to enable ease of separation. 
     One embodiment of a food container system includes a wet press molded container of solid continuous construction of fibrous material. The container has a floor and contiguous upstanding sidewalls angling outward and upward to a surrounding upper lip. Each sidewall has at least one lug that projects from an adjacent portion of the respective sidewall and is thicker from a projecting surface to a base surface on an opposite face of the sidewall than a nominal wall thickness of the adjacent portion of the respective sidewall. The floor and sidewalls surround an inner cavity below the upper lip adapted to receive food. Each lug has a lateral width of at least 0.2 inches and no more than 1 inch, wherein a first molded container may be stacked within a second molded container such that the lugs on the first container contact the inner surface of the second container at the location of the lugs on the second container and maintain a predetermined axial spacing between the first and second containers. 
     The food container may be rectangular with four sidewalls each having at least one of the lugs. Each of the sidewalls may have two of the lugs spaced apart closer to adjacent corners than each other. In one embodiment, each of the sidewalls has two of the lugs, wherein a first pair of sidewalls opposite one another have lugs with base surfaces which are contiguous and uninterrupted relative to the surface of adjacent portions of the sidewall. Also, a second pair of sidewalls opposite one another have lugs with base surfaces which are indented or stepped relative to the surface of adjacent portions of the sidewall. 
     A second food container system includes a wet press molded rectangular container of solid continuous construction of fibrous material. The container has a floor and four contiguous upstanding sidewalls angling outward and upward to a surrounding upper lip. The floor and sidewalls surrounding an inner cavity below the upper lip adapted to receive food. The sidewalls include at least one outwardly projecting lug in each sidewall that are each thicker from an inner surface to an outer surface thereof than a nominal wall thickness of adjacent sidewalls. Each lug has a lateral width of at least 0.2 inches and no more than 1 inch. A first molded container may be stacked within a second molded container such that the lugs on the first container contact the inner surface of the second container at the location of the lugs on the second container and maintain a predetermined axial spacing between the first and second containers. 
     In the second food container system, each of the sidewalls has two of the lugs spaced apart closer to adjacent corners than each other. In one version, the lugs are spaced apart from adjacent corners no less than ⅕ and no greater than ⅓ of the total dimension of the respective sidewall from the corner. At least some of the lugs may be positioned midway up a corresponding sidewall, though the lugs may alternatively be positioned at a lower end of a corresponding sidewall and form part of the floor. 
     In the second food container system, each of the sidewalls may have two of the lugs, wherein a first pair of sidewalls opposite one another have lugs with inner surfaces which are contiguous and uninterrupted relative to the inner surface of adjacent portions of the sidewall. Also, a second pair of sidewalls opposite one another may have lugs with inner surfaces which are indented or stepped relative to the inner surface of adjacent portions of the sidewall. 
     In one version, the lugs in either system project outward from the sidewalls, though the lugs may alternatively project inward from the sidewalls. Preferably, each lug is teardrop shaped with a mass weighted toward a lower end. 
     The thickness t of each of the lugs in either system may be between about 3-5 times the nominal wall thickness of the sidewalls. In addition, the nominal wall thickness of the sidewalls may be between about 0.6 mm and 0.7 mm. Further, each lug may have a lateral width of between 0.2-0.5 inches. 
     Other features and characteristics of the present invention, as well as the methods of operation, functions of related elements of structure and the combination of parts, and economies of manufacture, will become more apparent upon consideration of the following description and the appended claims with reference to the accompanying drawings, all of which form a part of this specification, wherein like reference numerals designate corresponding parts in the various figures. 
    
    
     
       DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a perspective view from above of an exemplary rectangular food tray container of the present application, and  FIG.  2    is a perspective view of the food tray container from below; 
         FIGS.  3 A and  3 B  are top and bottom plan views, respectively, of the rectangular food tray container; 
         FIG.  4    is a sectional view through the center of the food tray container across a width dimension, taken along line  4 - 4  of  FIG.  3 A , and  FIG.  4 A  is an enlargement of one sidewall thereof; 
         FIG.  5    is a sectional view through the center of the food tray container across a length dimension, taken along line  5 - 5  of  FIG.  3 B , and  FIG.  5 A  is an enlargement of one sidewall thereof; 
         FIG.  6    is a sectional view of a plurality of food tray containers across a length dimension stacked and nested, and  FIG.  6 A  is an enlargement of the stacked sidewalls thereof; 
         FIG.  7    is a perspective view from above of an alternative rectangular food tray container of the present application, and  FIG.  8    is a perspective view of the food tray container from below; 
         FIGS.  9 A and  9 B  are top and bottom plan views, respectively, of the alternative rectangular food tray container; 
         FIG.  10    is a sectional view through the center of the alternative food tray container across a width dimension, taken along line  10 - 10  of  FIG.  9 A , and  FIG.  10 A  is an enlargement of one sidewall thereof; 
         FIG.  11    is a sectional view through the center of the alternative food tray container across a length dimension, taken along line  11 - 11  of  FIG.  9 B , and  FIG.  11 A  is an enlargement of one sidewall thereof; 
         FIG.  12    is a sectional view of a plurality of alternative food tray containers across a length dimension stacked and nested, and  FIG.  12 A  is an enlargement of the stacked sidewalls thereof; 
         FIG.  13    is a sectional view of a plurality of alternative food tray containers across a width dimension stacked and nested, and  FIG.  13 A  is an enlargement of the stacked sidewalls thereof; 
         FIG.  14    is a perspective view from above of a still further alternative rectangular food tray container of the present application, and  FIG.  15    is a perspective view of the food tray container from below; and 
         FIG.  16    is a sectional view through the center of a further alternative food tray container across a length dimension, and  FIG.  16 A  is a sectional view of a plurality of the alternative food tray containers across a length dimension stacked and nested. 
     
    
    
     DETAILED DESCRIPTION 
     The present application provides an improved food storage tray that may be stacked and nested with a plurality of identical food storage trays while maintaining a minimum axial spacing therebetween. The food storage trays illustrated herein have a floor connected to contiguous sidewalls extending around a continuous periphery, with no vent holes in the trays. However, vent holes are not excluded in certain situations. The sidewalls are relatively short in height so that the trays are somewhat shallow, preferable for containing meat products. However, the concepts described herein could be utilized in a variety of sizes and shapes of containers, and the claim should not be considered limited to shallow trays. Finally, two exemplary rectangular storage trays are illustrated and described herein as typical for use in the food industry. However, the rectangular peripheral shape is but one configuration, and the trays may be square, round, or various other polygonal or geometric shapes. 
     Generally, embodiments of the present invention are stackable, denestable trays, plates or other containers having features that facilitate denesting or manual separation of the containers when stacked. The embodiments described in this specification are generally referred to as “containers,” which includes trays, plates, and other stackable products. The containers are typically formed from paperboard or pressed or molded fiber, although alternate embodiments may include containers formed from a variety of other compostable or otherwise easily biodegradable materials. Suitable materials include, for example, microwave susceptor laminated paperboard, dual ovenable coated or laminated paperboard, acrylic release coated paperboard, and polymer extrusion coated paperboard. Indeed, although the packaging industry has been moving towards biodegradable materials, the food storage trays disclosed herein could be formed of conventional plastics. Moreover, although the storage trays are particularly useful for holding food products, they may be utilized in other contexts. 
     The processes for forming food tray containers as disclosed herein include various forms of wet press molding of fibrous material. “Wet press” involves a starting slurry of about 95% water and 5% fibrous matter and chemicals. A dip mold having the final shape of the container is dipped into the slurry from above. The dip mold has a mesh or otherwise porous surface through which a suction is pulled to apply a negative pressure to the slurry. The fibrous matter is thus sucked onto the bottom of the dip mold and confirms to its contours. Subsequently, while maintaining the suction, the dip mold is translated over a cold press which has the shape of the dip mold but in a mirror image to conform thereto. Bringing the dip mold and cold press together flattens the fibrous material therebetween and presses out most of the remaining water. Subsequently, the molded fibrous material is dried further, often with heat, until the final container results. When done properly, the resulting container is a highly compressed fibre that has “great hand,” meaning that the fibre is compressed to the point of looking like plastic, and has a sheen. The wet press process is used for many products formed from fibrous often recycled materials, including eggs cartons and wine bottle shipping pallets, for example. It should be understood that the wet press process cannot create intricate molded shapes, as with other molding processes such as injection or spin molding. 
       FIG.  1    is a perspective view from above of an exemplary rectangular food tray container  20  of the present application, and  FIG.  2    is a perspective view of the food tray container from below. As mentioned, the container  20  may have a relatively shallow configuration with a generally horizontal floor  22  and peripheral sidewalls  24  leading to a surrounding lip  26 . In most embodiments, reinforcing ribs  28  are molded in various patterns across the floor  22  and of the sidewalls  24  for stiffness. The container  20  is shown with two hot dogs or sausages  30  placed therein for context. 
     The container  20  as a rectangular configuration with a length dimension perpendicular to a shorter width dimension. The floor  22  being generally horizontal defines a vertical axis, or up and down within the tray. A generally rectangular cavity is thus formed within the sidewalls  24  and below the surrounding lip  26 . 
     With reference to the underside of the container  20 , a plurality of outwardly projecting lugs  32  are provided in each of the sidewalls  24  that serve to maintain an axial distance between a series of stacked containers  20 . In the illustrated embodiment, there are two spaced apart lugs  32  provided on each of the four sidewalls  24   
       FIGS.  3 A and  3 B  are top and bottom plan views, respectively, of the rectangular food tray container  20 , with  FIG.  3 B  indicating exemplary dimensions. In particular, the container  20  has a length L and a width W. The lugs  32  are desirably symmetric across the perpendicular major planes of the container  20 . That is, there are two lugs  32  on each of the long sidewalls  24  across from two lugs at the same locations on the opposite long sidewall, and two lugs  32  on each of the short sidewalls  24  across from two lugs at the same locations on the opposite long short sidewall. Each of the lugs  32  is shown spaced a distance A or B from the nearest corner of the container  20 , depending on whether it is on a long or short sidewall  24 . It should be noted that the “corners” in this sense means projections from the adjacent perpendicular sides, as the actual corners are rounded per convention. The length L and width W dimensions may vary, with one example being L=8.82 in and W=6.33 in. 
     The spacing distances A or B from the nearest corner may also vary, but in one embodiment are A=1.90 in and B=1.40 in. Another way to quantify these dimensions is that the two lugs  32  are no less than ⅕ of the total dimension of the respective sidewall from the corner, and no greater than ⅓ from the corner, or 0.2L&lt;A&lt;0.33L and 0.2B&lt;B&lt;0.33W. 
       FIG.  3 B  also indicates a width w of one of the lugs  32  on a sidewall  24 . Each lug  32  has a width w of at least 0.2 inches, such as between about 0.2-0.5 inches, primarily due to the process of formation, wet pressing, described below. That is, wet pressing cannot create narrow ribs, but instead is only capable of forming wider depressions and bumps of a minimum width. Though the lugs  32  could be wider than 0.5 inches, such as up to 1.0 inches, they are preferably 0.5 inches or less. 
     It should be understood that although two lugs  32  are considered adequate and preferable for even stacking of the containers  20 , a single lug  32  at the center of each sidewall may also be utilized, or more than two lugs may be provided per side. Moreover, the peripheral shape of the container may dictate the number of lugs. For example, if the container is circular, as opposed to rectilinear, there should be at least three of the lugs to provide a tripod of sorts for one container to nest within another while maintaining the desirable axial spacing. Likewise, if the container is triangular and peripheral shape, three lugs may be suitable, or two on each side of the triangle for a total of six. In summary, there are desirably at least three lugs for each contain regardless of shape, and for rectilinear or otherwise polygonal peripheral shapes, there may be at least one lug per side. However, a hexagonal container might have six lugs, one per side, or it may be adequate to have just one lug on each of three sides, in an alternating pattern of one lug on first, third, and fifth sides. 
       FIG.  4    is a sectional view through the center of the food tray container  20  across a width dimension, taken along line  4 - 4  of  FIG.  3 A , and  FIG.  4 A  is an enlargement of one sidewall thereof, while  FIG.  5    is a sectional view through the center of the food tray container across a length dimension, taken along line  5 - 5  of  FIG.  3 B , and  FIG.  5 A  is an enlargement of one sidewall thereof. The surrounding lip  26  is desirably molded to have a somewhat serpentine configuration in cross-section to provide stiffness and also present a prominent feature to grab and manipulate the container  20 . In particular,  FIG.  4 A  shows that, from out to in, the lip  26  includes an outer generally horizontal flange  40  contiguous with a somewhat semi-circular upward bend  42  which transitions downward to a right-angle curve  44 . The curve  44  leads to an inwardly-directed ledge  46  and then a rounded corner  48  just before dropping down into the container along the angled sidewall  24 . The upward bend  42  provides a convenient location to wish to attach a transparent plastic wrap for enclosing the contents of the container  20 . The horizontal flange  40  provides a convenient location enabling grasping separating nested trays from each other. 
     With reference in particular to  FIG.  5 A , the lugs  32  are solid and thicker than the nominal thickness dimension of the rest of the tray container  20 . In one embodiment, the tray container  20  comprises a molded quantity of material (e.g., fiber) resulting in a nominal thickness of between about 0.6 mm to 0.7 mm. The thickness t of each of the lugs  32 , on the other hand, is between about 3-5 times the nominal wall thickness of the container  20 . In one example, for a nominal container wall thickness of 0.7 mm, the thickness t of each of the lugs  32  is 3.0 mm. Stated in a more generic way to accommodate inwardly-directed lugs, each lug is thicker from a projecting surface to a base surface on an opposite face of the sidewall than the nominal wall thickness of the container  20 . In the embodiment of  FIG.  5 A , the projecting surface is outward while the base surface is on the inside of the sidewall  24 , and t shows the thickness. 
     Importantly, each of the lugs  32  only projects outward from the respective sidewall  24 . That is, the inner surface of the sidewall  24  seen in  FIG.  5 A  has a flat or planar configuration, while the outer surface of the lugs  32  is rounded, somewhat teardrop shaped (meaning the mass of the lugs is weighted toward a lower end so that there is a more abrupt curvature joined to the adjacent portion of the sidewall at the lower end versus the upper end which has a very gentle curvature). Because the lugs  32  are symmetrically located on each of the containers  20 , when a first container is stacked within a second container the outer surface of each of the lugs  32  of the first container contacts the planar inner surface of the corresponding sidewall on the second container into which it is nested. This prevents the first container from settling all the way down into the second container, resulting in a preferred axial spacing. 
       FIG.  6    is a sectional view of a plurality of food tray containers  20  across a length dimension stacked and nested.  FIG.  6 A  is an enlargement of the stacked sidewalls thereof, showing adjacent lips  26 , and in particular adjacent horizontal flanges  40  separated by an axial space S. The axial spacing S is created by contact between the lugs  32  of each container with the inner surface of the corresponding sidewall on the next adjacent container below, as shown. The particular magnitude of the axial spacing S may vary depending on needs of the food producer or handler, but is preferably between about 5-6 mm. The magnitude of the axial spacing S depends on several factors, most notably the thickness t of each of the lugs  32 , but also the angle of the sidewall  24 . 
     With reference back to  FIG.  5 A , a so-called draft angle θ is shown for the sidewalls  24  on both the long and short sides of the container  20 . Because the shape of the sidewalls  24  is identical around the entire container, the draft angles θ and lugs  32  on all four sides are also identical. In one embodiment, the draft angle θ is between about 30-35°. To ensure one particular axial spacing S of 5 mm, the draft angle θ is 35° and the thickness t of each lug  32  is 2.5 mm. 
       FIG.  7    is a perspective view from above of an alternative rectangular food tray container  50  of the present application, and  FIG.  8    is a perspective view of the food tray container from below. As with the first described food tray container  20 , the alternative container  50  has a rectangular configuration with a length dimension and a shorter width dimension. The container  50  has a floor with a central flat portion  52  surrounded by a plurality of longitudinal troughs  54 . Two opposed long dimension sidewalls  56  lead upward to peripheral lips  58 , while two opposed short dimension sidewalls  60  lead upward to peripheral lips  62 . As with the first container, the peripheral lips  58 ,  62  continuously surround and define an upper extent of a food-containing cavity within the container  50 , and are joined at rounded corners. The longitudinal troughs  54  comprise semi-cylindrical molded shapes for receiving food items, such as sausages or hotdogs as shown. The troughs  54  extend the length of the container  50 , except as interrupted by the central flat portion  52  which provides a convenient location for applying an external label to the bottom of the container. 
     The sidewalls  56 ,  60  of the container  50  once again feature outwardly-directed lugs  64 ,  66  to ensure a minimum axial spacing between adjacent containers when they are stacked or nested. In contrast to the first embodiment, the long sidewalls  56  and short sidewall  60  are not identically-configured so that the lugs  64 ,  66  are also not the same. 
       FIGS.  9 A and  9 B  are top and bottom plan views, respectively, of the alternative rectangular food tray container  50 . Although not shown, the nominal wall thickness and rectangular dimensions of the container  50  may be the same as described above for the first container  20 , and thus will not be repeated. 
       FIG.  10    is a sectional view through the center of the alternative food tray container  50  across a width dimension, taken along line  10 - 10  of  FIG.  9 A , and  FIG.  11    is a sectional view through the center of the alternative food tray container across a length dimension, taken along line  11 - 11  of  FIG.  9 B . The configuration of the semi-cylindrical troughs  54  are seen in  FIG.  10   , which also shows the long sidewalls  56  extending upward generally at a constant angle to the upper lips  58 .  FIG.  11   , on the other hand, shows a stepped configuration for the short sidewalls  60  leading upward to the upper lips  62 . This illustrates the concept that the various sidewalls around the containers as described herein may be the same or different. 
       FIG.  10 A  is an enlargement of one long sidewall  56  of the container  50 . As with the earlier embodiment, an inner surface of the sidewall  56  is relatively flat and uninterrupted, while the lugs  64  project outward in solid bulges, which are somewhat teardrop shaped in section (again, the mass of the lugs is weighted toward a lower end). The thickness t 1  of the lugs  64  at an angle perpendicular to the inner surface of the sidewall  56  is desirable between about 3-5 times the nominal wall thickness of the remainder of the sidewalls, and for that matter for the remainder of the container  50 . Specific ranges and exemplary dimensions provided above for the first exemplary container  20  may be utilized and therefore will not be repeated here. A sidewall draft angle a is shown and may also be as described above for the first embodiment. 
     The upper lip  58  once again has a somewhat serpentine configuration with an outward horizontal flange  70  contiguous with a somewhat semi-circular upward bend  72  which transitions downward to a right-angle curve  74 . The curve  74  leads to an inwardly-directed ledge and then a rounded corner just before dropping down into the container along the angled sidewall  56 . Again, this configuration provides stiffness and an outer handle for manipulating the container  50 , much like that described above. 
       FIG.  11 A  is an enlargement of one short sidewall  60  illustrating the indented or stepped nature at the lugs  66  in contrast to the constant cross-section of the long sidewall  56  in  FIG.  10 A . In particular, a short upward step  80  is provided between the floor troughs  54  and the upwardly and outwardly angled sidewall  60  so as to create intermediate ledges  82  therebetween. The short sidewalls  60  have draft angles β which may be the same as or different than the draft angle a of the long sidewalls  56 . The draft angles β are desirably within a range as described above for the sidewalls  24  of the first container  20 . 
     Each short sidewall  60  has two outwardly directed lugs  66  that project outward from the angled inner surface of the sidewall  60 . More particularly, each lug  66  has a thickness t 2  that is greater than the nominal wall thickness of the surrounding portions of the sidewall  60 , and for that matter than the wall thickness of the rest of the container (except for the other lugs  64 ). The thickness t 2  of each lug  66  may be the same as or different than the thickness t 1  of the lugs  64 . In one embodiment, the draft angles β of the short sidewalls  60  are the same as the draft angle a of the long sidewalls  56 , and the thicknesses are the same (t 1 =t 2 ). 
     The lugs  66  that project outward from the short sidewalls  60  as seen in cross-section in  FIG.  11 A  are constructed slightly differently than the lugs  64  on the long sidewalls  56 , which are seen in  FIG.  10 A . That is, the stepped wall shape with the intermediate ledges  82  are only present at the location of the lugs  66 , such that the lugs may be seen from the inside of the container  50 , as in  FIG.  7   . In other words, the lugs have both an internal concavity and an external convexity. Despite this, the lugs  66  are not simply outward bows in the sidewalls  60  due to the increased thickness t 2  that is greater than the nominal wall thickness of the surrounding portions of the sidewall  60 . The increased thickness t 2  helps create the spacing S between adjacent containers  50  when stacked, along with the wholly outwardly convex lugs  64  on the long sidewalls  56 . In other words, the lugs may be wholly outwardly projecting or a combination of outwardly projecting and inwardly recessed. The spacing S between adjacent containers  50  is a result of one type of lug or a combination of both. 
     A generally linear relationship exists between the draft angles and the thicknesses of the various lugs to ensure a predetermined axial spacing between nested containers  50 . That is, due to the innate geometry, steeper sidewalls/greater draft angles require thicker lugs to result in the same axial spacing as center lugs on shallower sidewalls/lesser draft angles. Therefore, for example, if the draft angle a of the long sidewalls  56  is less than the draft angles β of the short sidewalls  60 , then the thickness t 1  of the lugs  64  is necessarily less than the thickness t 2  of each lug  66  so as to result in equal contact between the lugs  64 ,  66  and the adjacent containers  50 . A variety of permutations are contemplated. 
       FIG.  12    is a sectional view of a plurality of alternative food tray containers  50  across a length dimension stacked and nested, and  FIG.  12 A  is an enlargement of the stacked short sidewall  60  thereof. Likewise,  FIG.  13    is a sectional view of a plurality of alternative food tray containers  50  across a width dimension stacked and nested, and  FIG.  13 A  is an enlargement of the stacked long sidewalls  56  thereof. Contact between the respective lugs  64 ,  66  and the inner surface of the sidewall  56 ,  60  there below is shown. As explained above, the configuration of the sidewalls and lugs are such that the resulting spacing S remains constant around the container  50 . Once again, the spacing S may vary depending on need, and exemplary ranges are provided above for the first container  20 . 
       FIG.  14    is a perspective view from above of a still further alternative rectangular food tray container  90  of the present application, and  FIG.  15    is a perspective view of the food tray container from below. In most respects, the alternative container  90  is constructed the same as the container  50 , and the description of above of common features applies. The difference is in placement of lugs  92  on the short sidewalls  94 . That is, the lugs  92 , which are both outwardly projecting and inwardly recessed as with the lugs  66  described earlier, are located lower down on the sidewalls  94 , closer to the floor of the container. Indeed, the lugs  92  form a part of the floor. A comparison between  FIGS.  7  and  14    shows this difference. The placement of the outward lugs  96  on the longer sidewalls  98  remain the same as the lugs  64  on the container  50 . The lugs  96  are wholly outwardly projecting as well. 
       FIG.  16    is a sectional view through the center of a further alternative food tray container  20 ′ across a length dimension, and  FIG.  16 A  is a sectional view of a plurality of the alternative food tray containers stacked and nested. In this version, the container  20 ′ has a plurality of inwardly projecting lugs  32 ′ in each of the sidewalls  24  that serve to maintain an axial distance between a series of the stacked containers. The number and spacing of the inwardly projecting lugs  32 ′ may be as described above for the earlier embodiments. For instance, the thickness relative to the remainder of the sidewall thickness, and absolute values, are the same, and each lug  32 ′ is somewhat teardrop shaped in section. The inwardly projecting lugs  32 ′ serve the same purpose as the outwardly projecting lugs  32 —to provide spacing S between the stacked containers  20 ′, as shown in  FIG.  16 A . In this embodiment, the each lug is thicker from a projecting surface (inner extend of lugs  32 ′) to a base surface on an opposite face of the sidewall (exterior of sidewall  24 ). 
     The innovative wet press molded containers are especially useful and desirable because of the spacing lugs as claimed; in particular the lugs are shaped as a rounded bulge and have a thickness (t) of between 3-5 times the nominal wall thickness of the container sidewalls. Because the sidewalls angle outward and upward to a surrounding upper lip, the lug thickness ensures that a minimum axial spacing is provided between adjacent stacked containers without being over-large which would reduce stacking efficiency. Conventional molded lugs are formed by pushing the sidewall with a mold to create a pushed out lug, but that results in a nesting of two adjacent container and no spacing. The “filled” lugs as claimed in the present application prevents this nesting so parts have a prescribed gap, and distance between the parts remain constant. The denesting lugs need to be the prescribed depth to remain effective, which is to say that the depth of the compressed fibre lugs needs to be pronounced to have a certain amount of contact with the bottom part to remain effective and produce the needed axial spacing between adjacent stacked containers. 
     Unless otherwise indicated or the context suggests otherwise, as used herein, “a” or “an” means “at least one” or “one or more.” 
     Furthermore, unless otherwise stated, any specific dimensions mentioned in this description are merely representative of an exemplary implementation of a device embodying aspects of the invention and are not intended to be limiting. 
     While the present invention has been described and shown in considerable detail with reference to certain illustrative embodiments, including various combinations and sub-combinations of features, those skilled in the art will readily appreciate other embodiments and variations and modifications thereof as encompassed within the scope of the present invention. Moreover, the descriptions of such embodiments, combinations, and sub-combinations is not intended to convey that the invention requires features or combinations of features other than those expressly recited in the claims. Accordingly, the present invention is deemed to include all modifications and variations encompassed within the spirit and scope of the following appended claims.