Reclosable Food Tray and Tray Blank with Yang's Notch Cut as Fastening Mechanism; and Carrying Strap for Carrying Single or Multiple Food Trays

Abstract

A reclosable food tray is disclosed comprising a receptacle portion and two pairs of opposing closure flaps. The receptacle portion has substantially trapezoidal volume defined by a rectangular shaped bottom panel and two substantially upstanding pair of opposing side panels. The opposing side panels defined four pairs of adjacent panels which are hingedly connected in liquid-sealed manner by four folded gussets secured by three pairs of notch cuts. The notch cut is a curved and hook-like cut serves as interlocking mechanism to hold the food tray together. The pair of notch cuts can also be disconnected from each other to open the penal(s). The notch cut enable the food tray shipped in blank and erected by end user, also eliminates metal wire and adhesives that are commonly used by prior arts. A carrying strap purposely designed for carrying one or multiple food trays is a component of the invention.

Description

BACKGROUND OF THE INVENTION

1. Field of Invention

The present invention generally relates to a preconstructed folding food tray which is adapted to open and close easily and, more particularly, to a foldable tray blank and method of erecting the blank to form the constructed tray. The present invention is an improvement of the prior art invented by DeMay and filed with the US Patent & Trademark Office in 1995, U.S. Pat. No. 5,411,204.

2. Brief Description of the Prior Art

Fast, convenient take-out and prepared food services have become a way of life in modern society. There many food trays, containers have been made and distributed to retails where food are served and delivered. Furthermore, many gift shops have used verity of such containers as gift wrapping and decorations. The most commonly used food tray is the Chinese food pail that is universally known in the take-out food industry. It is preconstructed at the manufacturing plant by folding a precut blank and fastening the gusset flaps with glue or metallic wire. Commercial products of this type have been offered by Fold-Pak Corporation since approximately 1977. Hundreds of millions such food pails are manufactured and distributed worldwide annually.

The food pails fastened by adhesive (glue) are easily break open during stacking and shipping and adhesive is deposited on the interior surface of the blank, specifically between the adjacent panels which form each corner of the carton. When exposed to high temperature, this adhesive can cause undesirable contamination of the contents and once opened, it is quite a hassle to reclose. Those that are using metal wire are not microwave resistant if the metal wire is not removed, as well, it is not convenient to open for pouring out of food or use it as disposable dinning container. Without opening the tray, food or contents is almost invisible from other angles unless directly peak from top opening. In addition, they all are pre-constructed at manufactures and take certain amount of space for packaging, shipping and storing. The DeMay's 1990 invention of the recloseable food tray only offered the previously existing food pail a top recloseable panels. The present invention permits the food pail re-open and reclose from both top and side as end user desires.

This disclosure indicates a clear need for a folding food carton which overcomes the deficiencies of earlier art-recognized techniques. Furthermore, the current computer guided precision cut and laser cut technologies have made the present invention easily manufactured and cost effective possible.

Accordingly, it is a primary object of the present invention to provide a blank, reclosable food tray which is substantially leak-proof and adapted for exposure to microwave and other high temperature applications.

It is another object of the present invention to provide a convenient, reusable container for an assorted selection of take-out and prepared foods

Another object is to provide a food tray which can be shipped in blank to the end user. It is cost effective on manufacturing, wrapping, shipping and storing.

It is a further object of the present invention to provide a food tray which has improved operability and improved “closeability” and which affords improved protection to the food contents after reclosing.

Another object is to provide an easy reopen/recloseable container that make the content transferred from, or to other containers easily. As well, make food or content in tray more visible from opening.

A further object of the present invention is to provide a container that can be easily opened and served as a temporary, informal food plate and make-shift dinning containers for casual occasions.

A further object of the present invention is to provide folding tray blanks which can be constructed in a simple and efficient manner. Optimally, it can be stored as tray blank and constructed by end user at last minute when needed.

Another object of the present invention is to provide tray blanks of varying configurations which are adapted with cuts and score lines to form an assembled tray container for take-out and prepared foods.

Another object of the present invention is to provide an environmentally attractive food tray made from biodegradable material. Less material is used, less energy consumed when manufacturing it. In result, less packing material and less cargo space when shipping.

A further object of the present invention is to provide tray blanks which are adapted for manufacture from paperboard sheet stock using high-speed cutting and scoring machines.

It is a further object of the present invention to provide tray blanks using a minimum amount of stock during the cutting and scoring operations.

A further object of the present invention is to provide a method of erecting the food tray without high speed operations involved.

Another object of the present invention is to provide end user a carrying strap that is capable carrying multiple containers at same time as very commonly that people taking out several different food containers on a single trip.

A further objective of the present invention is to minimize, or even eliminate, the usage of extra brown, plastic bags that are commonly provided to host multiple containers.

A further objective of the present invention is to expose exterior surface which could be utilized for retail logos, advertisements, art work/decoration, identification marks and social awareness communications, etc.

Based on this disclosure, additional objects of the present invention will be apparent to those with ordinary skill in the pertinent art.

SUMMARY OF THE INVENTION

A reclosable food tray is provided by one aspect of the present invention. The tray is constructed from a single unitary blank, and comprises a receptacle portion and first and second pair of opposing closure flaps.

The receptacle portion has access openings, from top or from side, which permits introduction of food. Its volume is defined by a rectangular shaped bottom panel and two substantially upstanding pair of opposing side panels. The two pair of opposing side panels extend substantially upright from the bottom panel and define four pair of adjacent side panels at the corners of the bottom panel. Each pair of adjacent side panels are hingedly connected in a liquid-sealed manner, by a folded gusset unitary with the respective adjacent side panels, and is secured by Yang's notch cuts on the folded gussets. The first pair of opposing closure flaps that have Yang's notch cut extend from one pair of opposing side panels and are capable of covering or closing off a portion of the access opening. The second pair of opposing closure flaps that have Yang's notch cut extend from the other pair of opposing side panels and are interlocked by Yang's notch cuts to cooperate with each other, overlap a portion of the first pair of opposing closure flaps that can be interlocked by Yang's notch cut, and cover the remaining portion of the access opening. Each folded gusset is suitably dimensioned so that the receptacle portion is capable of retaining liquids or semi-solid consumables without leakage. Each folded gusset is also bearing Yang's notch cut that serves as interlock mechanism to hold the tray in shape.

In the preferred embodiment, the food tray is erected from a paperboard or stiff plastic material which is substantially resistant to microwave and other heat radiation. With the food tray of the present invention, food can be safely and efficiently heated in a microwave or convection oven.

According to another aspect of the present invention, a tray blank is provided having a planar unitary construction and a substantially rectangular gross geometry. The blank generally comprises a bottom panel; first and second pair of opposing side panels; four foldable gussets with Yang's notch cut and first and second pair of opposing closure panels with Yang's notch cut.

The bottom panel has a rectangular shape and a surface area defined by a first and second pair of opposing bottom fold lines. The first and second pair of opposing side panels are hingedly connected to the bottom panel at the first and second pair of opposing bottom fold lines, respectively. These opposing panels define four pair of adjacent side panels, each adjoining at a corner of the bottom panel. Each foldable gusset is hingedly connected to each pair of adjacent side panels. When the first and second opposing side panels are folded substantially upright with respect to the bottom panel, the tray receptacle with an access opening is formed, each gusset is folded adjacent toward an exterior portion of one side panel and interlock with an opposing gusset through Yang's notch cuts. With Yang's notch cut on said gusset, it permits gussets detach from each other that also permits one side panel tilt open as side receptacle access. Each side panel is disposed substantially upright at a predetermined obtuse angle with respect to the bottom panel.

The first pair of opposing closure panels is hingedly connected to the first pair of opposing side panels. Each closure panel has a said Yang's notch cut at its top edge, is adapted to close off a portion of the access opening when folded and disposed substantially parallel to the bottom panel. The second pair of opposing closure panels is hingedly connected to the second pair of opposing side panels, and adapted to overlay a portion of the first pair of opposing closure panels and close off the remaining portion of the access opening through Yang's notch cut. A fastening means may be provided for selectively opening and closing the second pair of closure panels.

Another aspect of the present invention concerns a novel method of erecting a food tray from a blank in a simple, yet highly efficient manner with a minimum number of folding operations.

BRIEF DESCRIPTION OF THE DRAWINGS

Reference is made to the following description of the preferred embodiment in connection with the accompanying drawings. With FIG. 1 as the reference, all the numbers and letters on different illustrations of the first present invention, the food tray, are intent to be consistent with FIG. 1; With FIG. 7 as the reference, all the letters and numbers on different illustrations of the second present invention, the carrying strap, are intend to be consistent with FIG. 7, wherein:

FIG. 1 is a plan view of the new and improved tray blank of the present invention.

1, 2, 3 and 4 are Yang's notch cut on top closure panels; 5 through 12 are Yang's notch cut in back to back fashion on gussets 21,22, 23 and 24; 26 through 33 are optional short line cut that associate with Yang's notch cuts for easy insertion and security of Yang's notch cut when erected the tray blank to shape; 25 is the bottom panel; 17, 18, 19 and 20 are substantially upstanding side panels; 13, 14, 15 and 16 are closure panels; 34 through 53 are foldable lines.

FIG. 2 is a perspective view of the new and improved tray, in erected and half-way enclosed stage of the present invention; it illustrates the second stage of erecting a tray blank to tray container. Visible Yang's notch cuts, 5, 6, 9, 10, 11 and 12 on visible gussets 21, 23 and 24; Yang's notch cuts 1, 2, 3 and 4 on closure panels 13, 14, 15 and 16. All Yang's notch cuts are not yet hooked into each other to fully close the food tray at this stage.

FIG. 3 is a perspective view of the tray blank after it has been completely folded to form the food tray of the present invention, being shown in its erected position ready for stacking with other like trays and ready to be carried by the second invention, Carrying Strap, described in said claim 24 above;

FIG. 4 is a detailed plan view of one Yang's notch cut 1, in 2, one of the four closure gussets; Inner loop line 5 and outer loop line 6 merge into each other at tip point 3; 4 is optional rough edge (zigzag or teeth like lines) on inner loop line 5 to increase friction for more security when notch cut intertwined. Inner loop line 5 can be a smooth loop line without rough edge. This drawing illustrates only partial closure panel.

FIG. 5 is a detailed plan view of Yang's notch cut 1 and 2 on opposite side of gussets that have been folded together along folding line (not shown in this drawing), but before hook into each other.

FIG. 6 is detailed plan view of one foldable gusset with two Yang's notch cuts 1 and 2 are in back to back position before folding lines pressed. The two sections 8 and 9 divided by foldable line 5 are in equal size and mirror image. 3 and 4 represent the short line cut for more security after two notch cuts intertwined. When folded, the two sections 8 and 9 will become one section with two identical layers (see 9 and 10 in FIG. 7).

FIG. 7 is a detailed plan view of two gussets after folded becoming double layers, before intertwined to connect. 1 and 2 are Yang's notch cuts with two layers on two opposite gussets; 3 and 4 are short cuts with two layers; 9 and 10 are two opposite gussets after folded the illustration as FIG. 6.

FIG. 8 is a plan view of the new invention, the Carrying Strap, designed to carry single and/or multiple the new and improved food tray. Bottom rectangle panel A; triangle panels B and C; foldable lines J, J1, J2, J3, K, K1, K2 and K3 (folding lines can be selected based on needs); fish scale cut F, F1, F2, F3, G, G1, G2 and G3 (scale cut can be more or less based on needs); strap on opposite end E and D; short line cut H, H1, H2, H3, I, I1, I2 and I3 (short line can be selected based on needs); round tip M and N; 0, P, Q, R, S and T are edge lines.

FIG. 9 is a perspective view of the erected Carrying Strap with one said food tray sliding down toward to the bottom panel of the present invention, the Carrying Strap. To stack more said food trays, the same operation will be repeated.

FIG. 10 is a perspective view of multiple of the first present invention, the Food Tray fully erected and stacked in a fully erected and looped the second present invention, the Carrying Strap.

OPERATION (NUMBERS BELOW REFERRED TO FIG. 1)

• • 1) Erect the pre-cut, pre-shaped flat single unitary blank paper/plastic sheet to box shape. Press the blank sheet along folding lines 34 through 53;
  • 2) Push first pair of foldable gussets 21 and 22, and then second pair 23 and 24 toward to each other until they overlap to each other;
  • 3) Gently twist and wiggle to snap double layered Yang's notch cuts, 5 and 6 pair to 7 and 8, then 9 and 10 pair to 11 and 12, into each other;
  • 4) Pull back gently to make sure the two said notch cuts snug tightly and intertwined;
  • 5) Put food or other contents into the food tray; (Note: food or contents can be introduced through unclosed side panel that has foldable gussets that are enclosed by Yang's notch cuts.)
  • 6) Close the first pair of re-closable top closure panels 13 and 15 and then, 14 and 16, by Yang's notch cuts as described in Step 3 and 4 to close the tray;
  • 7) Erect the second present invention, the carrying strap, from blank. Fold it along the foldable line to adjust bottom panel A to match the size of bottom panel of the food tray;
  • 8) Slide in the carrying strap, from bottom to top, between intertwined two pairs of foldable gussets, 21 & 22 and 23 & 24 that have been connected and interlocked by Yang's notch cuts. Alternately, fold and interlock the guests after the carrying strap is in position;
  • 9) Lock the carrying strap at two ends by using short line cut, H and I, into each other;
  • 10) Push inward the fish scale cut(s), G and F, on the straps D and E, to add extra stability and security while carrying the food tray. The purpose of the fish scale cuts is to minimize trays' movement.
  • 11) To access food or contents of the tray, remove food tray(s) from the Carrying Strap;
  • 12) Twist and unlock Yang's notch cut to reopen the food tray from side or from top.

REFERENCE

• Provisional patent application: U.S. 61/633,793, Filed Feb. 18, 2013 Receipt Date: Mar. 5, 2012

U.S. Patent Documents

396,570	January 1889	Hotchkiss
1,982,557	November 1934	Watson
2,330,521	September 1943	Scheide
2,391,767	December 1945	Beerend
2,475,294	July 1949	Rafoth
2,528,016	October 1950	Smith
2,676,747	April 1954	Lange
2,801,930	August 1957	Paulucci
2,810,506	October 1957	Kessler
2,917,221	December 1959	Risdon
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3,043,068	July 1962	Blonder
3,128,725	April 1964	Becker et al.
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3,352,472	November 1967	Cummings et al.
3,542,569	November 1970	Farquhar
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3,863,832	February 1975	Gordon et al.
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3,913,823	October 1975	Lin
3,983,256	September 1976	Norris et al.
4,036,423	July 1977	Gordon
4,202,465	May 1980	McLaren
4,253,602	March 1981	Kulig
4,277,506	July 1981	Austin
4,279,933	July 1981	Austin et al.
4,304,335	December 1981	Bemiss
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5,411,204	May 1995	DeMay

Foreign Patent Documents

626,234	August 1961	CA
1,405,944	June 1965	FR

Other References

• Fold-Pak, Chinese Food Pail Blank No. 1J, 1977.

Claims

1. A reclosable food tray erected from a single unitary blank having an interior and exterior surface and a substantially square gross geometry. Unlike prior arts, the present invention has notch cuts (named Yang's notch cut, hereunder) that enable the food tray, without assistant of foreign materials, e.g. adhesive or metal wire, etc., shipped in blank, erected and shaped by end user. Also, as designed, the said food tray can be opened and reclosed from both top and side panels that have said Yang's notch cuts as fastening and interlocking mechanism. The food tray comprises: a fully constructed receptacle portion having access openings, from top or from side, permitting introduction of food into said receptacle portion having a volumetric geometry defined by a rectangular shaped bottom panel, a first substantially upstanding pair of opposing side panels, a second substantially upstanding pair of opposing side panels said pairs of opposing side panels defining four pairs of adjacent side panels, with each pair of adjacent side panels being hingedly connected by one of four folded gussets, with each of said gussets unitary with said adjacent side panels, secured and interlocked to the opposing said gusset by said Yang's notch cuts. Each said panel has a short line cut at joint point located at upper end (side panel at upstanding position) of said side panel and said gusset. Each said folded gusset and said exterior surface, each said side panel being disposed at a first obtuse angle measured from said bottom panel so that said volumetric geometry facilitates nesting of the receptacle portion of one reclosable food tray within the receptacle portion of another reclosable food tray;Yang's notch cut, a curved, looped and hook-like cut in paperboard and other stiff sheet materials serves as interlocking mechanism to hold said reclosable food tray. The Yang's notch cut comprises: an inner loop line; an outer loop line; a tip point where the outer and inner loop lines curved and merged together; an optional zigzag cut (or teeth-like rough edge) along inner loop line. These inner loop line cuts serve a purpose of more security to enclose said food tray. Said Yang's notch cut can be hooked into each other and un-hook from each other permitting said food tray reclose and reopen. Yang's notch cut can be adapted to many other materials and products as connecting, interlocking tool.a first pair of opposing closure flaps, each extending from one of said opposing side panels and being capable of closing off a portion of said access opening with said Yang's notch cut; anda second pair of opposing closure flaps, each extending from one of the other pair of opposing side panels and being adapted to cooperatively interlock with each other by said Yang's notch cut and overlap a portion of said first pair of opposing closure flaps to close off said access opening.

2. The reclosable food tray of claim 1, wherein each said folded gusset is suitably dimensioned so that said receptacle portion is capable of retaining liquid or semi-solid consumables without leakage through said receptacle portion.

3. The reclosable food tray of claim 2, wherein said two substantially upstanding pair of opposing side panels comprise a first side panel disposed opposite a second side panel, a third side panel disposed opposite a fourth side panel, with said first side panel being adjacent said third and said fourth side panels and said second side panel being adjacent said third and said fourth side panels to form a volume having trapezoidal dimensions.

4. The reclosable food tray of claim 1, wherein said blank comprises paperboard material which is substantially resistant to microwave and other heat radiation.

5. The reclosable food tray of claim 1, wherein said first pair of opposing closure flaps are hingedly connected to said respective opposing side panels along respective top fold lines, and each folded gusset has an upper edge which extends substantially along one of said respective top fold lines.

6. The reclosable food tray of claim 5, wherein said first and second pair of opposing side panels are hingedly connected to said bottom panel along respective bottom fold lines, and each side panel has left and right side fold lines, each of which are disposed at a second obtuse angle with respect to adjacent bottom fold lines.

7. The reclosable tray of claim 6, wherein said blank comprises paperboard material which is substantially resistant to microwave and other heat radiation.

8. The reclosable food tray of claim 1, which further comprises a folded partition for insertion into said receptacle portion to divide said receptacle portion into two or more separate food storage compartments. Said partition could be straight insertion to divide said food tray diagonally into two triangular portions or two rectangular portions; and could also be “S” shape insertion, “X” (or cross) shape insertion and even tube (cylinder) insertion, etc.

9. A reclosable food tray constructed from a single unitary blank having an interior and exterior surface, which comprises: a receptacle portion having an access opening permitting introduction of food into said receptacle portion having a volume defined by a rectangular shaped bottom panel, a first substantially upstanding pair of opposing side panels, a second substantially upstanding pair of opposing side panels said pairs of opposing side panels defining four pairs of adjacent side panels, with each pair of adjacent side panels being hingedly connected by one of four folded gussets, with each of said gussets unitary with said adjacent side panels, secured and interlocked to the opposing said gusset by said Yang's notch cuts and short line cuts. Each said side panel being disposed at a first obtuse angle measured from said bottom panel;a first pair of opposing closure flaps, each extending from one of said opposing side panels and being capable of closing off a portion of said access opening; and a second pair of opposing closure flaps, each extending from one of the other pair of opposing side panels, said second pair of opposing closure flaps interlock each other by Yang's notch cut and overlap a portion of said first pair of opposing closure flaps to close off said access opening.

10. A blank adapted to be folded into a reclosable food tray having a fully constructed receptacle portion with a volumetric geometry which facilitates nesting of the receptacle portion of one food tray within the receptacle portion of another said food tray, said blank having a planar unitary construction, an interior and an exterior surface and a substantially square gross geometry, which comprises: a bottom panel of rectangular shape having a surface area defined by a first and second pair of opposing bottom fold lines;a first and second pair of opposing side panels hingedly connected to said bottom panel along said first and second pair of opposing bottom fold lines, said opposing panels defining four pair of adjacent side panels; four foldable gussets, each said foldable gusset being hingedly connected to each pair of adjacent side panels so that when said first and second opposing side panels are folded substantially upright with respect to said bottom panel, a receptacle portion with an access opening is formed, each said foldable gusset is folded and can be secured by Yang's notch cut and a short line cut to an opposing foldable gusset that has Yang's notch cut and a short line cut as well. Two Yang's notch cuts enable said gussets interlocked to each other. And each said side panel is disposed substantially upright at a first predetermined obtuse angle with respect to said bottom panel;a first pair of opposing closure panels, each hingedly connected to one of said first pair of opposing side panels and being dimensioned to close off a portion of said access opening when folded over said access opening and disposed substantially parallel to said bottom panel;a second pair of opposing closure panels, each hingedly connected to one of said second pair of opposing side panels and being dimensioned to close off said access opening when folded over said access opening and said first pair of opposing closure panels.

11. The blank of claim 10, wherein said second pair of opposing closure flaps comprises a releasable fastening means to selectively open and close said second pair of closure flaps when folded down over said first pair of closure flaps and said access opening.

12. The blank of claim 10, wherein said first pair of opposing bottom fold lines comprises a first bottom fold line opposing a second bottom fold line, said second pair of opposing bottom fold lines comprises a third bottom fold line opposing a fourth bottom fold line; said first pair of opposing side panels comprises a first side panel contiguous with said first bottom fold line, and having a surface area defined by a first top fold line, a first left side fold line, a first right side fold line and said first bottom fold line, said first top and bottom fold lines being substantially parallel and said first left and right side fold lines diverging from said first bottom fold line at a said predetermined obtuse angle; and a second side panel disposed opposite of said first side panel, being contiguous with said second bottom fold line, and having a surface area defined by a second top fold line, a second left side fold line, a second right side fold line and said second bottom edge fold line, said second top and bottom fold lines being substantially parallel and said second left and right side fold lines diverging from said second bottom fold lines at said second predetermined obtuse angle; and said second pair of opposing side panels comprises a third side panel contiguous with said third bottom fold line, and having a surface area defined by a third top fold line, a third left side fold line, a third right side fold line and said third bottom fold line, said third top and bottom fold lines being substantially parallel and said third left and right side fold lines diverging from said third bottom fold line at said second predetermined obtuse angle; and a fourth side panel disposed opposite of said second side panel, being contiguous with said fourth bottom fold line, and having a surface area defined by a fourth top fold line, a fourth left side fold line, a fourth right fold and said fourth bottom fold line, said fourth top and bottom fold line being substantially parallel and said fourth left and right side fold lines diverging from said fourth bottom fold line at said second predetermined obtuse angle.

13. The blank of claim 10, wherein said foldable gussets comprise: a first foldable gusset being contiguous with said first and third side panels, and having a first corner fold line and a first corner edge, a Yang's notch cut and a short line cut are created close to the tip of the edge; a second foldable gusset being contiguous with said first and fourth side panels, and having a second corner fold line and a second corner edge, a Yang's notch cut and a short line cut are created close to the tip of the edge; a third foldable gusset being contiguous with said fourth and second side panels, and having a third corner fold line and a third corner edge, a Yang's notch cut and a short line cut are created close to the tip of the edge; and a fourth foldable gusset being contiguous with said second and third side panels, and having a fourth corner fold line and a fourth corner edge, a Yang's notch cut and a short line cut created close to the tip of the edge.

14. The blank of claim 12, wherein said first pair of opposing closure panels comprises: a first closure panel with a Yang's notch cut at the top of the edge being contiguous with said first side panel; and a second closure panel with a Yang's notch cut at the top of the edge being contiguous with said second side panel; and said second pair of opposing closure panels comprises a third closure panel with a Yang's notch cut at the top of the edge being contiguous with said third side panel; and a fourth closure panel with a Yang's notch cut at the top of the edge being contiguous with said fourth side panel.

15. The blank of claim 12, wherein a pair of Yang's notch cuts interlocking means is formed in one of said opposing first and second closure panels or said opposing third and fourth closure panels for selectively opening and closing said opposing closure panels.

16. The blank of claim 11, wherein said first foldable gusset has a surface area generally defined by said first left side fold line, said third right side fold line and said first corner edge; said second foldable gusset has a surface area generally defined by said first right side fold line, said fourth left side fold line and said second corner edge; said third foldable gusset has a surface area defined by said fourth right side fold line, said second left side fold line and said third corner edge; and said fourth foldable gusset has a surface area generally defined by said second right side fold line, said third left side fold line and said fourth corner edge.

17. The blank according to claim 14, wherein said first closure panel has a first left closure panel edge, a first right closure panel edge, and a surface area generally defined by said first top fold line, said left closure panel edge and said first right closure panel edge; said second closure panel has a second left closure panel edge, a second right closure panel edge, and a surface area generally defined by said second top fold line, said second left closure panel edge and said second right closure panel edge; said third closure panel has a third left closure panel edge, a third right closure panel edge, and a surface area generally defined by said third top fold line, said third left closure panel edge and said third right closure panel edge; and said fourth closure panel has a fourth left closure panel edge, a fourth right closure panel edge, and a surface area generally defined by said fourth top fold line, said fourth left closure panel edge and said fourth right closure panel edge.

18. The blank according to claim 17, wherein said first left closure panel edge has a portion adjacent said first top fold line which is substantially parallel to said third bottom fold line; said first right closure panel edge has a portion adjacent to said first top fold line which is substantially parallel to said fourth bottom fold line; said second left closure panel edge has a portion adjacent to said second top fold line which is substantially parallel to said fourth bottom fold line; and said second right closure panel edge has a portion adjacent to said second top fold line which is substantially parallel to said third bottom fold line.

19. The blank according to claim 16, wherein said third left closure edge has a portion adjacent to said third top fold line which is substantially parallel to said second bottom fold line; said third right closure panel edge has a portion adjacent to said third top fold line which is substantially parallel to said first bottom fold line; said fourth left closure panel edge having a portion adjacent to said fourth top fold line which is substantially parallel to said first bottom fold line; and said fourth right closure panel edge has a portion adjacent to said fourth top fold line which is substantially parallel to said second bottom edge fold line.

20. A blank adapted to be folded into a reclosable food tray having a receptacle portion with a volumetric geometry which facilitates nesting of the receptacle portion of one food tray within the receptacle portion of another said food tray, said blank having planar unitary construction and a substantially square gross geometry, which comprises: a bottom panel of rectangular shape having a surface area defined by first, second, third and fourth bottom fold lines; a first side panel contiguous with said first bottom fold line having a surface area defined by a first top fold line, a first left side fold line, a first right side fold line and said first bottom fold line, said first top fold line and said first bottom fold line being substantially parallel and said first left and right side fold lines diverging from said first bottom fold at a predetermined angle; a second side panel disposed opposite said first side panel and contiguous with said second bottom fold line, having a surface area defined by a second top fold line, a second left side fold line, a second right side fold line and said second bottom fold, said second top and bottom fold lines being substantially parallel and said second left and right side fold lines diverging from said second bottom fold line at said predetermined angle; a third side panel contiguous with said third bottom fold line having a surface area defined by a third top fold line, a third left side fold line, a third right side fold line and said third bottom fold, said third top and bottom fold lines being substantially parallel and said third left and right side fold lines diverging from said third bottom fold line at said predetermined angle; a fourth side panel disposed opposite said second side panel and contiguous with said fourth bottom fold line, having a surface area defined by a fourth top fold line, a fourth left side fold line, a fourth right side fold line and said fourth bottom fold line, said fourth top and bottom fold lines being substantially parallel and said fourth left and right side fold lines diverging from said fourth bottom fold line at said predetermined angle; a first foldable gusset with a Yang's notch cut and a short line cut created close to the tip of the edge being contiguous with said first and third side panels, and having a first corner fold line and a first corner edge; a second foldable gusset with a Yang's notch cut and short line cut created close to the tip of the edge being contiguous with said first and fourth side panels, and having a second corner fold line and a second corner edge; a third foldable gusset with a Yang's notch cut and short line cut created close to the tip of the edge being contiguous with said fourth and second side panels, and having a third corner fold line and a third corner edge; a fourth foldable gusset with a Yang's notch cut and a short line cut created close to the tip of the edge being contiguous with said second and third side panels, and having a fourth corner fold line and a fourth corner edge; a first closure panel with a Yang's notch cut on leading edge being contiguous with said first side panel; a second closure panel with a Yang's notch cut on leading edge being contiguous with said second side panel; a third closure panel with a Yang's notch cut on the leading edge being contiguous with said third side panel; a fourth closure panel with a Yang's notch cut on the leading edge being contiguous with said fourth side panel; and fastening means said Yang's notch cut formed in at least one opposing pair of said closure panels for selectively opening and closing said closure panels. With said Yang's notch cut on every single of said closure panel will increase tightness of fastening said food tray.

21. Said Yang's notch cut: A curved, looped and hook-like cut in paperboard and other stiff sheet materials serves as interlocking mechanism to hold said reclosable food tray. To enable said Yang's notch cut works as locking device, as well, to enforce the strength of interlock, said Yang's notch cut should be created geometrically and evenly at upper portion of said four gussets, in back to back fashion (mirror image); in another word, cut openings facing said adjacent side panels. Said Yang's notch cuts on each of said gussets shall become one Yang's notch cut with double layers when said foldable gussets folded along said fold line to shape said food tray.

22. other type of notch cuts on the said gusset of said food tray have been considered and tested, including but not limited to, zigzag cut, triangle cut, etc., However, the present Yang's notch cut has been proven serves the best purpose of the idea. All other shape and designs of cuts should be considered within the scope of the new invention and under the same dome of the claim.

23. for easy insertion and security of said Yang's notch cut when enclosing said food tray, a short straight line cut is created on each gusset at top edge adjacent to said Yang's notch cut. A carrying strap designed to hold one or multiple said food trays together, after erected from said tray blank and tightened by said Yang's notch cuts in closed position. Said carrying strap can be manufactured with the same materials as of said food tray, or any other suitable materials, such as plastic, textile and flexible metal, etc., which comprises:

24. a carrying strap erected from a single unitary blank.

25. a fully constructed said carrying strap is defined by a rectangular shape bottom panel.

26. said rectangular bottom panel continues and hingedly connect to one substantially upstanding pair of opposing side triangle panels that have purposely designed foldable line or lines at lower part of said triangle panels.

27. said multiple foldable lines enable the size of said bottom rectangular panel and said triangle panels become adjustable to fit the above said food tray in different size.

28. continued with said pair of triangle panels and, with reduced width at top portion of said triangle panels, a pair of long, narrow, extended strap of opposing side connect to said triangle