Patent Publication Number: US-2018037360-A1

Title: Container With Edge Protection Features

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims the benefit of U.S. Provisional Patent Application No. 62/371,410, filed on Aug. 5, 2016. 
    
    
     INCORPORATION BY REFERENCE 
     The disclosure of U.S. Provisional Patent Application No. 62/371,410, filed on Aug. 5, 2016, is hereby incorporated by reference for all purposes as if presented herein in its entirety. 
     BACKGROUND OF THE DISCLOSURE 
     The present disclosure relates to blanks, containers, trays, constructs, and various features to facilitate forming a container from a blank. More specifically, the disclosure is generally directed to a container or tray having edge protection features. 
     Prior art food trays such as those disclosed in U.S. Pat. No. 8,741,443 are known to include two layers of paperboard, a waterproof coating (e.g., polyethylene) on the inside surface of the tray for contact with the food product and a moisture-proof coating (e.g., acrylic) on the bottom surface of the tray. Such trays have edges at a flange region that are uncoated such that moisture can be absorbed into the paperboard layers at the edges of the flange. When fluids such as moisture are absorbed at the flange area of the tray, the flanges of the tray can become stained and visibly unattractive to consumers and can be structurally weakened by the high moisture absorption that is concentrated at the flange area. The entire content of U.S. Pat. No. 8,741,443 is incorporated by reference herein for all purposes. 
     The tray or container of the present disclosure improves on conventional food trays such as are disclosed in the &#39;443 patent by including edge protection features to minimize, inhibit, and/or prevent the moisture absorption in the flange area of the tray and the resulting staining and structural weakening of the tray. 
     SUMMARY OF THE DISCLOSURE 
     In one aspect of the disclosure, a container for holding a food product comprises a bottom wall, a side wall, and a flange extending from the side wall. The bottom wall and the side wall cooperate to at least partially define a cavity of the container, and the bottom wall, the side wall, and the flange comprise a base layer. The container also comprises an interior surface that at least partially forms the cavity, an exterior surface opposite the interior surface, and an edge at the flange that extends between the interior surface and the exterior surface. A coating at least partially covers the base layer and at least partially defines the interior surface, and the edge comprises an uncoated portion of the base layer. A protective strip covers the edge and prevents fluid from passing into the uncoated portion of the base layer at the edge. 
     In another aspect of the disclosure, a blank for forming a container for holding a food product in combination with a protective strip comprises a bottom wall portion of the blank, a side wall portion of the blank, and a flange portion of the blank extending from the side wall portion. The bottom wall portion and the side wall portion are for cooperating to at least partially define a cavity of the container fainted from the blank, and the bottom wall portion, the side wall portion, and the flange portion comprise a base layer. The blank also comprises an interior surface for at least partially forming the cavity, an exterior surface opposite the interior surface, and an edge at the flange portion of the blank that extends between the interior surface and the exterior surface. A coating at least partially covers the base layer and at least partially defines the interior surface, and the edge comprises an uncoated portion of the base layer. The protective strip covers the edge and prevents fluid from passing into the uncoated portion of the base layer at the edge. 
     In another aspect of the disclosure, a method of forming a container for holding a food product comprises obtaining a blank having a protective strip, the blank comprising a bottom wall portion, a side wall portion, and a flange portion extending from the side wall portion. The bottom wall portion, the side wall portion, and the flange portion comprise a base layer, an interior surface, an exterior surface opposite the interior surface, and an edge at the flange portion of the blank that extends between the interior surface and the exterior surface. A coating at least partially covers the base layer and at least partially defines the interior surface, and the edge comprises an uncoated portion of the base layer. The method further comprises forming a bottom wall from the bottom wall portion, a side wall from the side wall portion, and a flange from the flange portion, and the bottom wall and the side wall cooperate to at least partially define a cavity formed in the interior surface of the blank. The protective strip covers the edge at the flange and prevents fluid from passing into the uncoated portion of the base layer at the edge. 
     Those skilled in the art will appreciate the above stated advantages and other advantages and benefits of various additional embodiments reading the following detailed description of the embodiments with reference to the below-listed drawing figures. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       According to common practice, the various features of the drawings discussed below are not necessarily drawn to scale. Dimensions of various features and elements in the drawings may be expanded or reduced to more clearly illustrate the embodiments of the disclosure. 
         FIG. 1  is a plan view of a blank for forming a container according to one exemplary embodiment of the disclosure. 
         FIG. 2  is a plan view of the blank of  FIG. 1  including a protective strip applied thereon. 
         FIG. 3  is a cross-sectional view taken along the line  3 - 3  of  FIG. 2 . 
         FIG. 4  is a container forming from the blank and protective strip of  FIG. 2 . 
         FIG. 5  is a perspective view of the container of  FIG. 4  including a cover and containing a food product. 
         FIG. 6  is a schematic view of an apparatus for forming the container of  FIG. 4 . 
     
    
    
     Corresponding parts are designated by corresponding reference numbers throughout the drawings. 
     DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENTS 
     The present disclosure relates generally to various aspects of containers, constructs, trays, materials, packages, elements, and articles, and methods of making such containers, constructs, trays, materials, packages, elements, and articles. Although several different aspects, implementations, and embodiments are disclosed, numerous interrelationships between, combinations thereof, and modifications of the various aspects, implementations, and embodiments are contemplated hereby. In one illustrated embodiment, the present disclosure relates to a container or tray for holding food items or various other articles. However, in other embodiments, the container or tray can be used to hold other non-food containing articles or may be used for heating or cooking. 
     Referring initially to  FIG. 4 , the present disclosure is generally directed to a container or tray  5  that includes edge protection features including a protective strip  6  that at least partially overlies or covers an edge E of the container  5  to minimize, inhibit, and/or prevent fluids such as moisture from being transmitted to the material of the container  5  through an edge E of the container  5 . The container  5  can be used to hold a food product P ( FIG. 5 ), such as a meat product that can be frozen or unfrozen. The container  5  may hold other types of food products without departing from the disclosure. In use, the container  5  may be tipped or raised at an angle to better display the food product P, such as in a retail grocery store or other location. In such instances, fluids F, e.g., melted ice or other runoff from the food product P, or other fluids from the environment such as condensation, can travel across portions of the container  5  under the influence of gravity. The protective strip  6  minimizes, inhibits, and/or prevents such fluids in the container  5  from being absorbed into the material of the container  5  through the uncoated edge E of the container  5 . As noted below, the container  5  and protective strip  6  can have other features as shown and/or described herein. 
       FIGS. 4 and 5  illustrate the container  5  in in the form of a tray in accordance with the disclosure and having an interior surface  7 , a bottom wall  11 , two side walls  13 ,  15 , and two end walls  17 ,  19 . In the illustrated embodiment, the container  5  has four corners  23 ,  25 ,  27 ,  29  connecting respective side walls  13 ,  15  and end walls  17 ,  19 . A flange  21  extends outwardly from the side walls  13 ,  15 , end walls  17 ,  19 , and corners  23 ,  25 ,  27 ,  29 , and extends around the perimeter of the container  5 . The side walls  13 ,  15  and the end walls  17 ,  19  extend from the bottom wall  11 , and one or more of the side walls  13 ,  15  and the end walls  17 ,  19  cooperate with the bottom wall  11  to at least partially define a cavity  22  of the container  5 . In particular, an interior surface  7  ( FIG. 3 ) of the container  5  along the side walls  13 ,  15 , the end walls  17 ,  19 , the bottom wall  11 , and the flange  21  to form the cavity  22 . The cavity  22  is for holding the food product P and/or another article. Referring additionally to  FIG. 3 , in one embodiment, the container  5  comprises material similar to the material disclosed in the &#39;443 patent in that the container  5  comprises a base layer or laminate material  8  comprising two layers of paperboard  76 ,  78 . In this regard, the side walls  13 ,  15 , the end walls  17 ,  19 , the corners  23 ,  25 ,  27 ,  29 , and the flange  21  of the container  5  comprise the base layer  8 . The layers of paperboard  76 ,  78  can be attached by a layer of adhesive  84 , as shown. A waterproof coating  80  is disposed on the face of the upper layer of paperboard  76 , and a moisture-proof coating  82  is disposed on the face of the lower layer of paperboard  78 . In this regard, the waterproof coating  80  forms the interior surface  7  of the container  5  and can comprise various suitable waterproof coatings such as polyethylene extrusion coating or other suitable waterproof coatings. The moisture-proof coating  82  can be, for example, a water-based acrylic aqueous coating, and provides a moisture-proof barrier on the bottom of the container  5  and forms the exterior surface  9  of the container  5 . The moisture-proof coating  82  can be any suitable material that is resistant to fluids F ( FIG. 5 ), for example, moisture, but not waterproof. In embodiments, the container  5  could comprise a single layer of paperboard without departing from the disclosure, and/or one or more of the layers  76 ,  78  could be materials other than paperboard without departing from the disclosure. In the illustrated embodiment, the coatings  80 ,  82  are not disposed on the edge E such that the edge E is an uncoated portion of the base layer  8 . As shown, the container  5  includes a protective strip  6  attached to a portion of the container  5  that includes a portion of the bottom wall  11 , the side wall  13 , and the corners  23 ,  25 . In this regard, the protective strip  6  is attached to both the interior surface  7  and the exterior surface  9  of the container  5  and overlies at least a portion of the edge E along the side wall  13  and corners  23 ,  25 , and a portion of the end walls  17 ,  19  to provide a protective seal on the edge E. While the protective strip  6  is illustrated extending past the edge E of the container  5 , in embodiments, the protective strip  6  can be crimped or overlapped near the edge E of the container  5 . 
     Referring to  FIG. 1 , a blank  53  for forming the container or tray  5  ( FIG. 4 ) is illustrated. The blank  53  has corresponding portions that are formed into the side walls  13 ,  15 , end walls  17 ,  19 , corners  23 ,  25 ,  27 ,  29  and the flange  21  that extends around the perimeter of the blank  53  and the container  5 . The corner portions  23 ,  25 ,  27 ,  29  of the blank  53  have score lines  55  to facilitate the forming of the corners  23 ,  25 ,  27 ,  29  during the forming, for example, press-forming, of the blank  53  into the container  5 . In one embodiment, the blank  53  comprises the two layers of paperboard  76 ,  78 , the waterproof coating  80  that forms the interior surface  7  of the blank  53  and the container  5 , and the moisture resistant-coating  82  that forms the exterior surface  9  ( FIG. 3 ) of the blank  53  and the container  5 . The edge E of the blank  53  corresponds with the edge E of the container  5  and extends around the perimeter of the blank  53 . As shown in  FIG. 3 , the coatings  80 ,  82  do not extend between the interior surface  7  and the exterior surface  9  of the blank  53  such that the edge E of the blank  53  is exposed or uncoated. The blank  53  could have other features and materials without departing from the disclosure. 
     As shown in  FIGS. 2 and 3 , the protective strip  6  is attached to a portion of the blank  53  so that the protective strip  6  covers a portion of the interior surface  7 , a portion of the exterior surface  9 , and the edge E. In this regard, the protective strip  6  can be wrapped around a portion of the interior surface  7  and the exterior surface  9  of the blank  53 . In other embodiments, separate protective strips  6  can be applied to the respective interior surface  7  and exterior surface  9  of the blank  53 . In one embodiment, the protective strip  6  covers the side wall  13 , the corners  23 ,  25 , and the flange  21  that extends around the side wall  13  along the interior surface  7  and the exterior surface  9  of the blank  53 . The protective strip  6  can be alternatively configured to cover more of the edge E such as the edge of the side wall  15  and the corners  27 ,  29  without departing from the disclosure. In embodiments, the protective strip  6  can cover the entirety of the edge E without departing from the disclosure, or the protective strip  6  can cover less of the edge E than illustrated without departing from the disclosure. 
     The protective strip  6  can comprise a polymer liner that comprises a material such as polyethylene film (e.g., PET or polyethylene terephthalate film) or other polymer film or any other suitable material that can be adhered to the blank  53 , e.g., along portions that form the flange  21  and/or the side walls  17 ,  19  of the container  5  ( FIG. 4 ) and at least partially overlie or cover the edge E to seal the edge E and prevent fluids F, such as moisture, from being transmitted onto and/or into the edge E. In this regard, the protective strip  6  minimizes, inhibits, and/or prevents fluids F, such as moisture, from being absorbed into the paperboard layers  76 ,  78  at the edge E. The protective strip  6  can be otherwise shaped, arranged, and/or configured without departing from this disclosure. 
     As shown in  FIGS. 5 and 6 , the container  5  includes a cover or lid  91  that comprises packaging film, e.g., a thin plastic or other polymeric layer, that covers the container  5  and is wrapped around the container  5  and seals the container  5  to preserve and protect the food product P contained in the cavity  22  of the container  5 . In one embodiment, the cover  91  is in at least partial face-to-face contact with the flange  21  such that the cover  91  completely covers the flange  21  and extends around and covers at least a portion of the exterior surface  9  of the container  5  so that the cover  91  seals the container  5 . Any plastic or polymeric film, such as polyethylene, polypropylene, polyethylene terephthalate, polyvinylchloride, polyamide, and ethylene vinyl alcohol, or other suitable material, can be used. Any other suitable material can be used for forming the cover  91  that seals the food product P in the cavity  22  of the container  5 . Further, alternative lid materials can be used in combination with adhesives that can be used between the cover  91  and the sealing surface of the flange  21  or other surfaces of the container  5  without departing from the disclosure. Further, the cover  91  can be otherwise shaped, arranged, configured, or omitted without departing from the disclosure. 
       FIG. 6  shows a schematic of a system  101  and associated method or process for forming the container  5  with the protective strip  6  from the blank  53  according to one exemplary embodiment of the disclosure. As shown, a blank  53  is fed from a stack S of blanks  53  in a feeder  103  to a conveyor assembly  104  that conveys the blanks  53  in a direction of travel  105 . The conveyor assembly  104  can include spaced-apart lugs  106  attached to a respective belt  108  that engage the blanks  53  and move the blanks  53  through the system  101 . The blanks  53  are first fed below a supply  109  of poly film  110  that is folded around the blank  53  at the folding station  111 . Once the film  110  is folded around the blank  53  to seal at least a portion of the edge E of the blank  53  as described herein, the blank  53  and the film  110  pass to a sealing station  113 . At the sealing station, the film  110  is sealed to the interior (top) surface  7  ( FIG. 3 ) and the exterior (bottom) surface  9  ( FIG. 3 ) of the blank  53 . In one embodiment, the sealing station  113  includes an upper sealer  115  and a lower sealer  117 . The blank  53  with the sealed film  110  then passes to a cutting station  119  for cutting the folded and sealed film  110 . In one embodiment, the cutting station  119  includes a rotary sealer and cutting mechanism  121 , though the cutting station  119  could be otherwise configured without departing from the disclosure. In embodiments, the cut film  110  can be crimped or overlapped near the edge E of the container  5 . After the film  110  has been cut at the cutting station  119 , the blanks  53  with the protective strip  6  are ready to be press-formed into the container  5 . In one embodiment, a tool  125  can be used to form the blank  53  with protective strip  6  into the form of the container  5 . The tool  125  can include a female tool assembly  127  and a male tool assembly  129  that press the blank  53  and protective strip  6  into the container  5 . The tool  125  could be otherwise shaped, arranged, and configured without departing from the disclosure. 
     After forming the container  5 , and referring again to  FIG. 5 , the food product P can be placed in the cavity  22  of the container  5  and the cover  91  is placed over and around the container  5  to seal the food product P in the container  5 , for example, to maintain freshness or another desired state of the food product P. As noted above, when the container  5  with food product P that can be frozen, can be typically displayed in an angled orientation for displaying the food product P to the customer. In this regard, the cover  91  may be transparent such that the food product P is visible through the cover  91  in such an orientation. When the food product P thaws, fluid F such as moisture can accumulate in the cavity  22  of the container  5  and will collect near the sealed edge E wherein the protective strip  6  is located. In this regard, the protective strip  6  provides a barrier that covers the edge E and minimizes, inhibits, and/or prevents fluid F from passing into the uncoated paperboard layers  76 ,  78  at the uncoated or exposed edge E. Accordingly, the strength and integrity of the material of the container  5  is maintained by the presence of the protective strip  6  and the minimization, inhibition, and/or prevention of fluid F such as moisture entering the paperboard layers  76 ,  78 . As noted above, the container  5 , protective strip  6  and other features could be otherwise shaped, arranged, and/or configured without departing from the disclosure. 
     In some embodiments, and with reference to  FIG. 3 , the base layer  8  could include a single layer of paperboard, or more than two layers of paperboard, without departing from the disclosure. Further, the waterproof coating  80  could be any suitable coating to prevent fluid such as water or moisture from passing directly from the interior surface  7  of the container  5  ( FIG. 4 ) into the paperboard layers  76 ,  78 . Also, the moisture-resistant coating  82  could be any suitable coating to that resists fluid or moisture absorption into the base layer  8 . In embodiments, the moisture-resistant coating  82  could be omitted or could be inherent in the properties of the paperboard layer  78  without departing from the disclosure. 
     It is understood that the base layer  8  for the blank  53  ( FIG. 1 ) can be formed by any suitable process such as disclosed in the &#39;443 patent or any other process. The container  5  ( FIG. 4 ) can be formed from the blank  53  by press forming the container  5  by a forming tool or by any suitable process such as disclosed in the &#39;443 patent or any other process. Also, the blank  53  and the container  5  could be alternatively shaped (e.g., circular, oval, rectangular, annular, irregular, etc.) without departing from the scope of this disclosure. 
     Any of the features of the various embodiments of the disclosure can be combined with, replaced by, or otherwise configured with other features of other embodiments of the disclosure without departing from the scope of this disclosure. 
     Optionally, one or more portions of the blank or other constructs described herein or contemplated hereby may be coated with varnish, clay, or other materials, either alone or in combination. The coating may then be printed over with product advertising or other information or images. The blanks or other constructs also may be selectively coated and/or printed so that less than the entire surface area of the blank or substantially the entire surface area of the blank may be coated and/or printed. 
     All dimensional information presented herein is intended to be illustrative of certain aspects, features, etc., of various embodiments of the disclosure, and is not intended to limit the scope of the disclosure. The dimensions of the blanks, containers, forming tools, features, or any other dimension, can be more or less than what is shown and described in this disclosure without departing from the scope of this disclosure and can be within the listed ranges of dimensions for each feature or outside the listed ranges of dimensions for each feature without departing from the scope of this disclosure. 
     In accordance with the exemplary embodiments, the blanks may be constructed of paperboard of a caliper such that it is heavier and more rigid than ordinary paper. The blanks can also be constructed of other materials, such as cardboard, hard paper, or any other material having properties suitable for enabling the carton package to function at least generally as described above. 
     The foregoing description illustrates and describes various embodiments of the present disclosure. As various changes could be made in the above construction without departing from the scope of the disclosure, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense. Furthermore, the scope of the present disclosure covers various modifications, combinations, and alterations, etc., of the above-described embodiments. Additionally, the disclosure shows and describes only selected embodiments, but various other combinations, modifications, and environments are contemplated and are within the scope of the inventive concept as expressed herein, commensurate with the above teachings, and/or within the skill or knowledge of the relevant art. Furthermore, certain features and characteristics of each embodiment may be selectively interchanged and applied to other illustrated and non-illustrated embodiments without departing from the scope of the disclosure.