A frozen food packaging for a central kitchen

Abstract

The present invention discloses a frozen food package for a central kitchen, comprising a box body, a cover film and a box cover, wherein the cover film is heat-sealed on the box body, and the box cover and the box body are buckled with each other; a one-way exhaust valve is arranged on the cover film, and the one-way exhaust valve has an exhaust channel, and the exhaust channel is blocked by a valve sheet inside the one-way exhaust valve; when heated, the hot air flow generated in the box body lifts up the valve sheet, so that the exhaust channel is conductive; the one-way exhaust valve comprises a valve seat and a valve cover, wherein the valve seat is heat-sealed on the cover film, and the valve cover is fixed in the valve seat; the exhaust channel is composed of a plurality of air inlet holes opened on the valve seat, an inner cavity of the valve cover and a plurality of exhaust holes opened on the valve cover; the valve sheet is fitted on the top of the inner side of the valve seat, covering the plurality of air inlet holes. The present invention arranges a one-way exhaust valve on the cover film, so that the food package can maintain airtightness during freezing, low-temperature storage, transportation and distribution, and can exhaust air during heating, so as to prevent the gas from expanding due to heat and exploding the box.

Description

Technical Field

[0001] The present invention relates to food packaging, and more particularly to a frozen meal packaging for a central kitchen. Background Art

[0002] After the frozen meal is loaded into the packaging box in the central kitchen, it is heat-sealed with a cover film and capped, then frozen with liquid nitrogen and transported to the store at low temperature. After the diner microwaves it, the cover film can be torn off and eaten directly. Before consumption, the frozen meal needs to go through scenarios such as freezing, low-temperature storage and transportation, heating, and distribution. As the carrier of the meal, the frozen meal packaging must be able to withstand the above scenarios. On the one hand, if the airtightness of the meal packaging is poor, dry weight loss and dehydration will occur during the freezing process, microbial and other contaminants will invade during the storage and transportation process, and oil and water leakage and spillage will occur during the heating and distribution process. On the other hand, if the meal packaging is over-sealed, during the heating process, the accumulation of hot air will increase the risk of packaging bursting. Piercing holes in the cover film not only destroys the integrity of the packaging, but also makes it difficult to control the pore size, which is likely to cause water vapor loss and affect the taste. During the process of opening and eating, it is difficult to tear the cover film, which affects the experience. Existing frozen meal packaging cannot balance the above two aspects and urgently needs improvement. Summary of the Invention

[0003] Object of the Invention: The object of the present invention is to provide a frozen meal packaging for a central kitchen, which can ensure airtightness during freezing, storage and transportation, and distribution, and can exhaust air to avoid box bursting during heating, ensuring the hygiene and integrity of the meal and improving the consumer experience.

[0004] Technical Solution: To solve the above technical problems, the present invention provides a frozen meal packaging for a central kitchen, including:

[0005] A box body;

[0006] A cover film, heat-sealed on the box body;

[0007] A box cover, snap-fitted with the box body; characterized in that

[0008] The cover film is provided with a one-way exhaust valve, and the one-way exhaust valve has an exhaust passage, and the exhaust passage is blocked by a valve piece inside the one-way exhaust valve;

[0009] During heating, the hot air flow generated inside the box body lifts the valve piece, making the exhaust passage unblocked.

[0010] Further, the one-way exhaust valve further includes:

[0011] A valve seat, heat-sealed on the cover film;

[0012] A valve cover, fixed in the valve seat;

[0013] The exhaust passage is composed of a plurality of air inlet holes formed in the valve seat, the inner cavity of the valve cover, and a plurality of exhaust holes formed in the valve cover;

[0014] The valve plate is fitly arranged on the inner top of the valve seat to cover the plurality of air inlet holes.

[0015] Further, a gas storage cavity communicating with the plurality of air inlet holes is arranged at the bottom of the valve seat; a buffer cavity communicating with the plurality of air inlet holes is arranged at the inner top of the valve seat.

[0016] Further, the one-way exhaust valve further includes:

[0017] An exhaust hole baffle, which is rotationally connected to the valve cover through its central axis;

[0018] A limiting block is arranged at the inner top of the valve seat and is used to cooperate with the limiting groove on the valve plate to provide up-and-down movement guidance for the valve plate and prevent the valve plate from rotating and slipping;

[0019] The shaft end protrusion at the end of the central axis presses the valve plate, and the exhaust hole baffle blocks the exhaust holes on the valve cover; when the exhaust hole baffle is rotated and the exhaust holes are completely exposed, the shaft end protrusion of the central axis aligns with the central groove on the upper end surface of the valve plate, enabling the valve plate to move up and down.

[0020] Further, a second anti-slip pattern is arranged at the top of the exhaust hole baffle.

[0021] Further, a snap ring is arranged on the central axis, and the snap ring is located at the inner top of the valve cover and is used to provide axial limit for the central axis.

[0022] Further, a ring-shaped protrusion is arranged at the top of the valve cover, and a ring-shaped sliding groove that is slidably matched with the ring-shaped protrusion is arranged at the bottom of the exhaust hole baffle; a bevel block and a flat block are arranged on the ring-shaped protrusion, the bevel side of the bevel block faces the flat block, and an anti-theft opening block is arranged in the ring-shaped sliding groove; initially, the anti-theft opening block is located between the bevel block and the flat block.

[0023] Further, an arched bottom is arranged at the inner bottom of the box body, and an arched top is arranged at the top of the box cover, and the arched top is adapted to the arched bottom.

[0024] Further, a circle of positioning protrusions is arranged at the top of the box cover, and the positioning protrusions cooperate with the bottom of the box body to realize stacking.

[0025] Further, a circle of heat-sealed edges is arranged at the edge of the box opening of the box body, the edge of the heat-sealed edge extends out a curled edge, and a hooking groove is arranged at the bottom edge of the box cover, and the hooking groove and the curled edge are engaged with each other.

[0026] Further, two anti-scalding flanges extend from the edge of the heat-sealed edge, and the two anti-scalding flanges are opposite to each other; the anti-scalding flanges and the curled edge are disconnected at the cut-off position of the curled edge so that the anti-scalding flanges can be turned up and down; a notch for the anti-scalding flanges to turn up and down is arranged on the box cover.

[0027] Furthermore, the anti-scald flange surface is provided with first anti-slip lines.

[0028] Furthermore, the side wall of the box body is provided with strip-shaped reinforcing ribs.

[0029] Beneficial effects: Compared with the prior art, the present invention has the following remarkable advantages: By providing a one-way exhaust valve on the cover film, the meal packaging can maintain its sealing performance during freezing, low-temperature storage and transportation, and distribution, and can exhaust gas during heating, preventing the box from bursting due to gas expansion when heated. Description of the drawings

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required to be used in the embodiments of the present invention. Obviously, the following described drawings are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0031] Figure 1 It is a schematic structural diagram of a frozen meal packaging provided by an embodiment of the present application;

[0032] Figure 2 It is an exploded view of the one-way exhaust valve in an embodiment of the present application;

[0033] Figure 3 It is a schematic structural diagram of the cooperation between the valve cover and the exhaust hole baffle in an embodiment of the present application;

[0034] Figure 4 It is Figure 3 The enlarged view of the partial A of

[0035] Figure 5 It is the sealing principle diagram of the one-way exhaust valve in an embodiment of the present application;

[0036] Figure 6 It is the exhaust principle diagram of the one-way exhaust valve in an embodiment of the present application;

[0037] Figure 7 It is a schematic structural diagram of the box body in an embodiment of the present application;

[0038] Figure 8 It is a schematic structural diagram of the cover film and the box cover in an embodiment of the present application;

[0039] Figure 9 It is a schematic diagram of the interlocking stacking of frozen meal packages in an embodiment of the present application;

[0040] Figure 10 It is Figure 9 The enlarged view of the partial B of

[0041] Reference numerals:

[0042] 1, box body; 1011 / 1012, anti-scalding flange; 102, first anti-slip pattern; 103, crimping cut; 104, crimping; 105, heat-sealing edge; 106, arched bottom; 107, reinforcing rib;

[0043] 2, lid film; 201, tear-off strip; 202, through hole;

[0044] 3, box lid; 301, hook slot; 302, notch; 303, positioning protrusion; 304, arched top;

[0045] 4, one-way exhaust valve;

[0046] 401, valve seat; 4011, heat-sealing area; 4012, inverted frustum boss; 4013, buffer cavity; 4014, air inlet hole; 4015, limit block; 4016, air storage cavity;

[0047] 402, valve disc; 4021, central groove; 4022, limit groove;

[0048] 403, valve cover; 4031, inclined plane stop; 4032, flat plane stop; 4033, annular protrusion; 4034, shaft hole; 4035, exhaust hole; 4036, outer edge wall;

[0049] 404, exhaust hole baffle; 4041, annular sliding groove; 4042, second anti-slip pattern; 4043, central shaft; 4044, snap ring; 4045, shaft end protrusion; 4046, anti-theft opening block;

[0050] 5, hot air flow. Specific embodiments

[0051] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present invention.

[0052] As Figure 1 shown in the figure is a frozen food packaging for a central kitchen provided by an embodiment of the present application. The frozen food packaging includes a box body 1, a lid film 2, and a box lid 3. The box body 1 is heat-sealed with the lid film 2, and the box lid 3 is buckled with the box body 1. A one-way exhaust valve 4 is provided on the lid film 2. When heating the frozen food packaging, the one-way exhaust valve 4 can be used to exhaust gas and avoid the box from bursting. The box body 1 is packaged and sealed by the lid film 2 and the box lid 3. The lid film 2 performs physical sealing to block the contact between external water vapor and pollutants and the food. The box lid 3 realizes mechanical sealing, improves the overall mechanical strength of the lunch box, and protects the lid film 2 from being damaged. In this embodiment, the box body 1, the lid film 2, the one-way exhaust valve 4, and the box lid 3 are made of polypropylene PP material.

[0053] Figure 2 The one-way exhaust valve 4 is shown as an exploded view. The one-way exhaust valve 4 includes a valve seat 401, a valve plate 402, a valve cover 403 and an exhaust hole baffle 404. The longitudinal section of the valve seat 401 along the axis is in an inverted "Ω" shape, with the cavity facing upward. A heat sealing area 4011 is provided on the upper edge of the valve seat 401. Figure 8 The heat-sealing area 4011 is used to heat-seal and fix the valve seat 401 at the position of the through hole 202 of the cover film 2. A frustum boss 4012 is provided at the bottom of the inner side of the valve seat 401. In this embodiment, the inclination of the frustum boss 4012 is 2°. A plurality of air inlet holes 4014 are provided inside the frustum boss 4012. An air storage cavity 4016 connecting the plurality of air inlet holes 4014 is provided at the bottom of the valve seat 401. The function of the air storage cavity 4016 is to prevent the food inside the package from contacting the air inlet holes 4014 and causing them to be blocked. A buffer cavity 4013 connecting the plurality of air inlet holes 4014 is provided on the top surface of the frustum boss 4012.

[0054] A pair of limit blocks 4015 are provided at the top of the inverted frustum boss 4012 near the edge, and the two limit blocks 4015 are symmetrically distributed radially. An unbroken central groove 4021 is provided on the upper surface of the valve plate 402, and the lower surface is in contact with the surface of the inverted frustum boss 4012, covering a plurality of air inlet holes 4014. The buffer cavity 4013 enables the air pressure of the hot air flow 5 to act evenly on the valve plate 402 and push the valve plate 402 to move upward. Two limit grooves 4022 are symmetrically provided on the outer edge of the valve plate 402, and the two limit grooves 4022 are correspondingly plugged and matched with the two limit blocks 4015 on the surface of the inverted frustum boss 4012, so as to control the valve plate 402 to slide up and down, and prevent the valve plate 402 from rotating and sliding and dislocating in the horizontal direction.

[0055] An axial hole 4034 is provided at the center of the valve cover 403, and three exhaust holes 4035 are evenly distributed around the axial hole 4034. The outer edge wall 4036 of the valve cover 403 is consistent with the slope of the inverted rounded table boss 4012 in the valve seat 401, and the valve cover 403 and the valve seat 401 are tightly buckled to form an interference seal. A gap is left between the inner wall of the valve cover 403 and the outer edge of the valve plate 402. The multiple air inlet holes 4014 provided on the valve seat 401, the inner cavity of the valve cover 403 and the multiple exhaust holes 4035 provided on the valve cover 403 constitute an exhaust channel. When the valve plate 402 is attached to the top surface of the inverted rounded table boss 4012, the exhaust channel is blocked; when the valve plate 402 is lifted upward by the hot air flow 5 generated in the box body 1, the exhaust channel is opened for exhaust.

[0056] The exhaust hole baffle 404 is fan-shaped and is rotatably arranged in the shaft hole 4034 of the valve cover 403 through its central shaft 4043. A retaining ring 4044 is provided at the lower part of the central shaft 4043. The cross-section of the retaining ring 4044 is triangular. When installing the central shaft 4043, it can guide the central shaft 4043 to be inserted into the shaft hole 4034. After being installed in place, the retaining ring 4044 is reversely stuck at the inner top of the valve cover 403, thereby providing axial limit for the central shaft 4043 and preventing it from moving up and down. An axial end protrusion 4045 adapted to the central groove 4021 is provided at the end of the central shaft 4043.

[0057] Figure 3 and Figure 4 As shown in and

[0058] , the anti-theft opening structure of the one-way exhaust valve 4 is shown. Specifically, a circular protrusion 4033 is provided at the top of the valve cover 403, and a circular sliding groove 4041 that is slidably matched with the circular protrusion 4033 is provided at the bottom of the exhaust hole baffle 404. A bevel block 4031 and a flat block 4032 are provided on the circular protrusion 4033. The bevel side of the bevel block 4031 faces the flat block 4032. The bevel block 4031 plays a guiding role, while the flat block 4032 plays a limiting role. An anti-theft opening block 4046 is provided in the circular sliding groove 4041. Initially, the anti-theft opening block 4046 is located between the bevel block 4031 and the flat block 4032. Taking the bevel block 4031 and the flat block 4032 on the valve cover 403 as the positioning reference, the anti-theft opening block 4046 on the exhaust hole baffle 404 is inserted into the middle gap between the bevel block 4031 and the flat block 4032 to complete the assembly of the one-way exhaust valve 4.

[0058] When opening the one-way exhaust valve 4, the guiding bevel of the bevel block 4031 guides the anti-theft opening block 4046 to rotate in the bevel direction, and the flat block 4032 restricts the reverse rotation of the exhaust hole baffle 404 in the other direction. When the anti-theft opening block 4046 moves from one side of the bevel block 4031 to the other side as a whole, a "click" sound is emitted. At this time, the bevel block 4031 plays a hindering role in the reverse direction, and the anti-theft opening block 4046 cannot return to its initial position. Therefore, the user can only rotate the exhaust hole baffle 404 in one direction and cannot reset it after rotation. In this way, after the user gets the food, they can rotate the exhaust hole baffle 404 left and right. If it is found that the baffle 404 is loose, it proves that this one-way exhaust valve 4 has been opened by others.

[0059] In this embodiment, in order to facilitate the user to rotate the exhaust port baffle 404, a second anti-slip pattern 4042 is provided at the top of the exhaust port baffle 404.

[0060] Figure 7The following is a schematic structural diagram of the box body 1. The box body 1 is in the shape of a square frustum and has a demolding slope of 5°. In the middle of the inner bottom of the box body 1, there is a concave and rectangular arched bottom 106, which can be used for nesting multiple box bodies 1. It should be noted that the shape of the arched bottom 106 is not limited to a rectangle and can also be any regular or irregular shape. To improve the mechanical strength of the lunch box and the stability of self-softening after heating, strip-shaped reinforcing ribs 107 are provided on the side wall of the box body 1. In this embodiment, the number of reinforcing ribs 107 on the long side of the box body 1 is 5, and the number on the short side is 3. A heat-sealed edge 105 is provided at the edge of the box mouth of the box body 1, and a curled edge 104 extends from the edge of the heat-sealed edge 105. The cross-sectional shape of the curled edge 104 is approximately a right angle. To enable users to conveniently and safely take out the food after heating, a pair of anti-scald flanges 1011 / 1012 extend vertically at the center position of the wide side of the box body 1. The surface of the anti-scald flanges is provided with transverse first anti-slip lines 102. Considering that the polypropylene PP material will become soft after heating, a curled edge cut 103 is designed at the anti-scald flanges, so as to ensure that users can more easily rotate the anti-scald flanges from the vertical state to the horizontal state. After the food is heated, the user can directly pinch the anti-scald flanges with their hands to take out the food, effectively avoiding the scalding risk brought by traditional lunch boxes.

[0061] Combined with Figure 9 and Figure 10 , in order to cooperate with the arched bottom 106 of the box body 1, an outwardly convex and rectangular arched top 304 is provided at the middle position of the top of the box cover 3. At the same time, a circle of positioning protrusions 303 that cooperate with the bottom of the box body 1 are provided at the edge of the top of the box cover 3 to prevent the offset of the stacking position and improve the stacking stability. By utilizing the cooperation between the arched top 304 on the box cover 3 and the arched bottom 106 on the box body 1, as well as the restraint of the positioning protrusions 303 at the top of the box cover 3, the stability of the food during stacking, storage, and transportation is ensured. A hook groove 301 is provided at the bottom edge of the box cover 3, and the hook groove 301 engages with the curled edge 104. A notch 302 is provided at the center position of the wide side of the box cover 3, and the width of the notch 302 is slightly larger than the width of the anti-scald flange, so that the anti-scald flange can be turned up and down.

[0062] Combined with Figure 8 , the width of the cover film 2 that extends beyond the heat-sealed edge 105 of the box mouth of the box body 1 is a hand-tearable peeling strip 201, which is convenient for users to tear off the cover film 2 to open the package. The hand-tearable peeling strip 201 is clamped between the hook groove 301 and the curled edge 104, strengthening the tightness of the engagement between the box cover 3 and the box body 1.

[0063] Figure 5 The following shows the sealing principle of the one-way exhaust valve 4:

[0064] When the one-way exhaust valve 4 is sealed, the exhaust hole baffle 404 is in the initial closed state, blocking the exhaust hole 4035, and the external air flow cannot enter the one-way exhaust valve 4 through the exhaust hole 4035. The shaft end protrusion 4045 of the central shaft 4043 is misaligned with the central groove 4021 of the valve plate 402. Under the combined action of the shaft end protrusion 4045 and the round frustum boss 4012, the valve plate 402 cannot move up and down, so that a conductive exhaust passage cannot be formed.

[0065] The hot air flow 5 formed inside the box body 1 enters the air storage cavity 4016 and then enters the buffer cavity 4013 through the air inlet hole 4014. Due to the blockage of the valve plate 402, the hot air flow 5 forms a backflow in the buffer cavity 4013 and returns to the inside of the box body 1 again, thereby separating the inside and the outside and completing the sealing.

[0066] Figure 6 The above is the exhaust principle of the one-way exhaust valve 4:

[0067] Before the frozen food is heated, the user opens the box cover 3 and rotates the exhaust hole baffle 404 until the exhaust hole 4035 is completely exposed, and the shaft end protrusion 4045 of the central shaft 4043 is aligned with the central groove 4021 on the valve plate 402 accordingly.

[0068] During heating, the amount of water vapor increases and the air pressure rises, causing the hot air flow 5 to enter the air storage cavity 4016 and then pass through the air inlet hole 4014, gather in the buffer cavity 4013, and uniformly push the valve plate 402 upward. When the valve plate 402 moves upward, the shaft end protrusion 4045 of the central shaft 4043 is inserted into the central groove 4021 on the valve plate 402, and the valve plate 402 is separated from the round frustum boss 4012 by a certain distance, so that the exhaust passage is conducted.

[0069] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any change or replacement scheme that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A frozen food package for a central kitchen, comprising: Box body (1); A cover film (2) heat-sealed on the box body (1); The box cover (3) is buckled with the box body (1); and its characteristics are: A one-way exhaust valve (4) is provided on the cover film (2), the one-way exhaust valve (4) having an exhaust passage, the exhaust passage being blocked by a valve sheet (402) inside the one-way exhaust valve (4); When heated, the hot air flow (5) generated in the box body (1) lifts up the valve plate (402), thereby making the exhaust passage open; The one-way exhaust valve (4) further comprises: A valve seat (401) is heat-sealed on the cover film (2); A valve cover (403) is fixed in the valve seat (401); The exhaust passage is composed of a plurality of air inlet holes (4014) opened on the valve seat (401), an inner cavity of the valve cover (403), and a plurality of exhaust holes (4035) opened on the valve cover (403); The valve plate (402) is fitted on the top of the inner side of the valve seat (401) and covers the multiple air inlet holes (4014); The exhaust hole baffle (404) is rotatably connected to the valve cover (403) via its central axis (4043); A limit block (4015) is provided on the top inner side of the valve seat (401) for cooperating with a limit groove (4022) on the valve plate (402) to provide a guide for the valve plate (402) to move up and down and prevent the valve plate (402) from rotating or sliding. The shaft end protrusion (4045) at the end of the central shaft (4043) presses the valve plate (402), and the exhaust hole baffle (404) blocks the exhaust hole (4035) on the valve cover (403); the exhaust hole baffle (404) is rotated, and when the exhaust hole (4035) is completely exposed, the shaft end protrusion (4045) of the central shaft (4043) is aligned with the central groove (4021) on the upper end surface of the valve plate (402), so that the valve plate (402) can move up and down.

2. The frozen meal packaging according to claim 1, characterized in that, An air storage cavity (4016) communicating with the multiple air inlet holes (4014) is provided at the bottom of the valve seat (401); and a buffer cavity (4013) communicating with the multiple air inlet holes (4014) is provided at the top of the inner side of the valve seat (401).

3. The frozen food packaging according to claim 1, characterized in that, A snap ring (4044) is provided on the central shaft (4043). The snap ring (4044) is located at the top of the inner side of the valve cover (403) and is used to provide axial limitation for the central shaft (4043).

4. The frozen meal packaging according to any one of claims 1 to 3, characterized in that, An annular protrusion (4033) is provided on the top of the valve cover (403), and an annular groove (4041) slidably matched with the annular protrusion (4033) is provided on the bottom of the exhaust hole baffle (404); an inclined surface block (4031) and a plane block (4032) are provided on the annular protrusion (4033), and the inclined surface of the inclined surface block (4031) is opposite to the plane block (4032), and an anti-theft opening block (4046) is provided in the annular groove (4041); initially, the anti-theft opening block (4046) is located between the inclined surface block (4031) and the plane block (4032).

5. The frozen meal packaging according to claim 1, characterized in that, The inner bottom of the box body (1) is provided with an arch bottom (106), and the top of the box cover (3) is provided with an arch top (304), and the arch top (304) is matched with the arch bottom (106).

6. The frozen food packaging according to claim 5, characterized in that, A positioning protrusion ring (303) is provided at the top of the box cover (3), and the positioning protrusion (303) cooperates with the bottom of the box body (1) to achieve stacking.

7. The frozen meal packaging according to claim 1, characterized in that, A heat-sealed edge (105) is provided at the edge of the box opening of the box body (1), and a curled edge (104) extends from the edge of the heat-sealed edge (105). A hook slot (301) is provided at the bottom edge of the box cover (3), and the hook slot (301) engages with the curled edge (104).

8. The frozen meal packaging according to claim 1, wherein Two heat insulation flanges extend from the edge of the heat-sealed edge (105), and the two heat insulation flanges are opposite to each other; the heat insulation flanges and the curled edge (104) are disconnected at the curled edge cut (103) so that the heat insulation flanges can be turned up and down; a notch (302) for the heat insulation flanges to turn up and down is provided on the box cover (3).

Images