CN111820712A

CN111820712A - Metal film, paper pot and manufacturing method thereof

Info

Publication number: CN111820712A
Application number: CN202010613978.0A
Authority: CN
Inventors: 张莹
Original assignee: Shenzhen Xingjiang Technology Co ltd
Current assignee: Shenzhen Xingjiang Technology Co ltd
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2020-10-27

Abstract

The invention provides a metal film which is suitable for a paper pot and comprises Al0.021-0.022mg/cm²，Fe 0.015‑0.016mg/cm². The invention also provides a paper pot made of the metal film and a manufacturing method of the paper pot. The metal film provided by the invention has good flexibility, ductility, strength and forming performance and good heat conducting performance, and the paper pot manufactured by the metal film is simple and rapid to use, convenient to carry and good in flexibility and heat conducting performance.

Description

Metal film, paper pot and manufacturing method thereof

Technical Field

The invention relates to the technical field of food packaging and material processing, in particular to a metal film, a paper pot containing the metal film and a manufacturing method of the paper pot.

Background

With the development of society, the living standard of people is continuously improved, the pace of life is continuously accelerated, and the requirements of people on instant cooking food are more and more popularized in order to meet the requirements of activities such as going out, outing, picnic and the like and also meet the requirements of rapid pace of life. The disposable paper container capable of cooking food can be transported at any time and any place, but the cooking containers are all pre-processed and formed, have certain volume, occupy certain space in the carrying and transporting process, and cause inconvenience in carrying and transporting. In addition, although the paper of the current paper container is provided with the metal film, the ductility, flexibility and strength of the metal film are not enough, so that the forming performance of the metal film is poor, and the paper pot made by punching the metal film is prone to causing container leakage due to the damage of the paper in the using process. And if the food in the paper container is heated, the heating and cooking speed is slow and the heating effect is not ideal because the heat-conducting property of the metal film is poor. Therefore, there is a need for a metal film that can be used in a composite layer of a paper pot and has good formability and thermal conductivity, and a cooking vessel that is simple and fast to use, convenient to carry, and has good flexibility, strength, and thermal conductivity.

Disclosure of Invention

The invention aims to provide a metal film which is used in a paper pot composite layer and has good forming and heat conducting properties, a paper pot with good heat conducting properties and a manufacturing method thereof. The technical scheme is as follows.

In one aspect of the invention, a metal film is provided for use in a composite layer of a paper pot, the metal film comprising Al0.021-0.022mg/cm²,Fe 0.015-0.016mg/cm²。

Further, the metal film further includes: si 0.0003-0.0005mg/cm²，K 0.001-0.002mg/cm²，Ca 0.0003-0.0005mg/cm²。

Further, the metal film comprises Al 0.0204mg/cm²,Si 0.0004mg/cm²，K 0.0013mg/cm²，Ca 0.0004mg/cm²，Fe 0.0144mg/cm²。

Further, the thickness of the metal film is 0.0001-0.001 mm.

In another aspect of the invention, a paper pot is provided, comprising a bottom; a sidewall connected to the bottom; the bottom and/or the side walls comprise a resin layer, a paper layer and a metal film according to any one of claims 1-4; the two side surfaces of the metal film are respectively connected with the resin layer and the paper layer;

the side wall comprises a folded portion and a side portion; the folded portion is connected with the side portion; adjoining the adjacent both side portions by folding of the folded portion; the bottom, side and folded portion in the unfolded state may be in the same plane.

Furthermore, a folding structure is arranged on the folding part, wherein the folding part comprises a first inward folding surface, a first outward folding surface, a second inward folding surface and a second outward folding surface; the first inward-folded surface is connected with the second inward-folded surface, and the first outward-folded surface or the second outward-folded surface is connected with the outer side of the side part; or the first outer folding surface is connected with the second outer folding surface, and the first inner folding surface or the second inner folding surface is connected with the inner side of the side part.

Further, the fold and the side portions form an angle a, an angle B, an angle C, an angle a, an angle B, an angle d; wherein said angle A is 30 °, said angle B is 75 °, said angle C is 105 °; or, the angle a is 45 °, the angle B is 45 °, and the angle C is 90 °; the angle a of the two upper sidelines of the folding part is less than or equal to the angles b and d of the upper sidelines of the folding part and the upper sidelines of the side part; the angle a is an obtuse angle.

In another aspect of the present invention, there is also provided a paper pot including: a bottom wall; and a side wall connected to the bottom wall; the side wall comprises a side part, a transition part and a folding part, and the upper edge of the side part, the upper edge of the transition part and the upper edge of the folding part are bent in the same direction to form a fixing part.

Further, the fold comprises a first fold and a second fold connected to each other;

the first folding structure comprises a folding wing connected between the transition part and the side part, and a first crease arranged at the connection part of the transition part and the folding wing;

the second folding structure comprises a second fold disposed between the folding wing and the side portion;

the inner surface of the folding wing is connected with the inner surface of the transition part, and the outer surface of the folding wing is connected with the outer surface of the side part; or the inner surface of the folding wing is connected with the inner surface of the side part, and the outer surface of the folding wing is connected with the outer surface of the transition part.

Further, a third crease is arranged between the bottom wall and the side part, and a fourth crease is arranged between the bottom wall and the transition part;

the third crease is linear; the fourth crease is connected with the third crease and is in a convex arc shape; the transition part is an arc-shaped wall matched with the fourth fold.

The invention also provides a manufacturing method of the paper pot, which comprises the following steps,

providing the metal film, the resin layer and the paper layer;

sequentially compounding the resin layer, the metal film and the paper layer to form a composite layer;

cutting the composite layer;

stamping the cut composite layer to form a paper pot;

wherein, the metal film adopts the metal film.

Further, the sequentially compounding the resin layer, the metal film and the paper layer to form a compound layer includes:

and sequentially pressing or bonding the resin layer, the metal film and the paper layer to form a composite layer.

According to the metal film provided by the invention, the appropriate content of Al, Si, K, Ca, Fe and other elements is added, so that the number and the crystal grain size of intermetallic compounds in the metal film can be optimized, and the tensile strength of the metal film at different angles can be improved, so that the ductility, the flexibility and the strength of the metal film are greatly improved, the stamping forming performance of the metal film can be greatly improved, and the metal film can be prevented from being easily cracked in the stamping forming process. In addition, metal elements such as Al, Fe and the like with proper content are added into the metal film, and the heat conductivity of the metal film can be improved. The invention provides a paper pot which is composed of a bottom stamped by a composite layer compounded by a metal layer, a resin layer and a paper layer and a side wall connected with the bottom, wherein the side wall comprises side parts and a folding part connected between the side parts, when in use, the adjacent two side parts can be connected into the paper pot composed of the bottom and the side wall by folding the folding part, the use is very convenient and fast, and simultaneously, when not in use, the bottom, the side parts and the folding part can be positioned on the same plane by unfolding the folding part, so that the paper pot can be carried in batch and is very convenient to carry. In addition, the metal layer of the composite layer for manufacturing the paper pot has good strength, toughness and formability, so that the paper pot provided by the invention has higher use strength, and the paper pot formed by stamping is not easy to crack and leak. Meanwhile, the metal film in the composite layer of the paper pot provided by the invention has good thermal conductivity, so that the paper pot has good thermal conductivity when food in the paper pot is heated, and the purposes of energy conservation and high efficiency can be achieved.

Drawings

FIG. 1 is a front view of a semi-expanded paper pot according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a folded and formed paper pan according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a fully-unfolded paper pot according to an embodiment of the present invention;

FIG. 4 is a side view of a paper pot in a semi-expanded state according to an embodiment of the present invention;

FIG. 5 is a schematic structural view of another paper pot according to an embodiment of the present invention;

fig. 6 is a schematic structural view of another paper pot according to the embodiment of the present invention after being folded.

Detailed Description

The metal film provided by the embodiment of the invention comprises Al0.021-0.022mg/cm²，Fe 0.015-0.016mg/cm². The metal film, the resin layer and the paper layer form a composite layer together, and the composite layer is used for manufacturing a paper pot, the paper pot is used for being matched with an induction cooker, or the paper pot is used for being matched with equipment which can generate electromagnetic waves to generate heat by a heating principle of magnetic field induced current (also called eddy current). When a composite layer of the metal film, the resin layer, and the paper layer is formed by press forming a paper pot, a high wrinkle pressure is generally applied to suppress generation of flange wrinkles. When high wrinkle pressure is loaded, the two surfaces of the die are covered with the adhesiveThe paper pot material generates high friction force, which increases the press forming load. Therefore, in order to enable deeper forming in the press forming of the paper pot, it is necessary to improve the ductility, flexibility and strength of the paper pot material so as to be adaptable to the press forming of the paper pot. The metal film provided by the embodiment of the invention plays a key role in ductility, flexibility and strength of the paper pot in the composite layer of the paper pot. By setting the composition of the metal film within the range of the present invention, the number of intermetallic compounds and the crystal grain size in the metal film can be optimized, and the formability of the paper for a pot can be greatly improved.

In the embodiment of the invention, the content of Fe in the metal film is set to be 0.015-0.016mg/cm². Fe has an effect of improving heat generation by induction of electromagnetic waves in the metal film by adding Fe in the above range. Since Fe can generate heat by a heating principle using a magnetic field induced current (also called eddy current), if the content of Fe is less than 0.015mg/cm²In this case, the metal film may have too little Fe to generate heat by the heating principle of the magnetic field induced current, resulting in a low heat generation effect, and if the Fe content exceeds 0.016mg/cm²In this case, since Fe increases the intermetallic compound having a circle-equivalent diameter of 1.0 to 5.0 μm which becomes a nucleation point of recrystallization, a large intermetallic compound is easily formed when the metal film is formed, and cracks are easily generated in the metal film during the forming process.

In an embodiment of the present invention, the metal film may further include Si 0.0003-0.0005mg/cm²，K 0.001-0.002mg/cm²，Ca 0.0003-0.0005mg/cm²。

In the examples of the present invention, the content of Si in the metal film was set to 0.0003 to 0.0005mg/cm². Si can improve the strength of the metal film by adding Si in the above range. If the content of Si is less than 0.0003mg/cm²The strength of the metal film is reduced. If the Si content exceeds 0.0005mg/cm²In this case, since intermetallic compounds having a circle-equivalent diameter of 1.0 to 5.0 μm, which become nucleation points for recrystallization, can be reduced, the final crystal particle size becomes large, and therefore, uneven forming is likely to occur during the paper pot forming, resulting in a reduction in the paper pot formability.

In the embodiment of the invention, Al in the metal film is 0.021-0.022mg/cm²,K 0.001-0.002mg/cm²，Ca0.0003-0.0005mg/cm²The strength, flexibility and ductility of the paper pot made of the metal film can be improved, so that the punching performance of the paper pot is improved, and the paper pot is prevented from leaking when the paper pot is used for containing liquid food and is heated and boiled. Of course, if the content of Al, K, Ca, etc. elements in the metal film is too low, the ductility, strength and toughness of the metal film are reduced, but if the content of Al, K, Ca, etc. elements in the metal film is out of the range described in the examples of the present invention, the metal film is easily solidified, cracks are easily generated during press forming, and the paper pot is easily leaked during use.

As a specific embodiment of the present invention, the components in the metal film may take any value within the range of the content of various elements, and the metal film can have good ductility, flexibility and strength. Of course, as a most preferred embodiment of the present invention, the contents of the respective components in the metal film are set to Al 0.0204mg/cm, respectively²,Si 0.0004mg/cm²，K 0.0013mg/cm²，Ca 0.0004mg/cm²，Fe 0.0144mg/cm²When the metal film is used, ductility, flexibility and strength of the metal film can be optimized.

The metal film surface of the present invention was observed by an optical microscope, or the metal film surface was analyzed by using image analysis software in which a microscope image of the metal film surface was input to a computer, and the number of intermetallic compounds was measured, and then the circle equivalent diameter of each intermetallic compound was determined, and it was found that the intermetallic compound having an average crystal grain diameter of 20 μm or less and a circle equivalent diameter of 1.0 to 5.0 μm of the metal film of the present invention could be 1.0 × 104 particles/mm²The above. These intermetallic compounds are often composed of Al — Fe system or Al — Fe — Si system, and these intermetallic compounds become nucleation sites at the time of recrystallization, and can make the crystal grain size minute, thereby improving the ductility, toughness and strength of the metal film, and easily deforming more uniformly at the time of paper pot punching, and thus greatly improving the formability. Also, the metal films of the examples of the present invention were determined by the test at 0 °45-90 tensile strength, the average value of the tensile strength may be 100N/mm2 or more. This indicates that the metal film of the present invention has high toughness and strength, and thus the metal film is less likely to cause a problem such as cracking during press forming. The circle-equivalent diameter in the present specification is defined as a diameter obtained by converting the area of the intermetallic compound into a perfect circle.

Since the metal film of the embodiment of the invention is compounded with the resin layer and the paper layer to form the compound layer for punching to manufacture the paper pot, when the manufacturing thickness is less than 0.0001mm, pinholes, cracks during pressing and the like are easily generated on the metal film in the compound layer during punching, and the production efficiency is easily reduced. If the thickness exceeds 0.001mm, the thickness of the entire paper pot becomes too thick, which increases the production cost and decreases the economic efficiency, and therefore, as an embodiment of the present invention, the thickness of the metal film is set to 0.0001 to 0.001 mm.

According to the metal film provided by the embodiment of the invention, as the metal elements such as Al and Fe with good heat conductivity are added, the heat conductivity of the metal film is greatly improved, and in order to furthest improve the heat conductivity of the metal film and not influence the performances such as ductility, toughness and strength of the metal film, the content of Al is set to be 0.021-0.022mg/cm²Setting the content of Fe at 0.015-0.016mg/cm²。

A metal film provided by the present invention is further illustrated by examples 1 to 19, but the present invention is not limited to these examples.

Alloy ingots containing appropriate contents of Al, Si, K, Ca, Fe and other elements are prepared, subjected to treatment processes such as homogenization treatment, hot rolling, cold rolling, annealing and the like, and finally rolled into metal films, wherein the thicknesses of the metal films of the examples are shown in Table 1, and the compositions of the metal films of the examples are shown in Table 1. The thermal conversion efficiency of each example metal film and the ductility of each example metal film are shown in table 2. Wherein the ductility of the metal film of each example is 1mm³Ductile area (mm) of metal film²) And (6) judging.

TABLE 1 formation of metal films of inventive examples 1-19Is divided into (mg/cm)²)

TABLE 2 Heat conductivity and ductility of the metal films of examples 1-19 of the present invention

As can be seen from table 2, the metal films provided in embodiments 1 to 19 of the present invention, by adding the elements of Al, Si, K, Ca, Fe, etc. in the above contents, not only the ductility, flexibility, and strength of the metal films of the embodiments are greatly improved, but also the stamping forming performance of the metal films can be greatly improved, so that cracks can be prevented from easily occurring in the stamping forming process of the metal films. Moreover, because the metal film is added with Fe metal element with proper content, the heat conductivity of the metal film of each embodiment is also obviously improved, and the heat conversion efficiency can be close to 90 percent at most. Can be well applied to the paper pot.

Referring to fig. 1, an embodiment of the present invention further provides a paper pot made of a composite material formed by compositing the metal film, the resin layer and the paper layer, including a bottom 1; a side wall connected to the bottom 1; the bottom 1 and/or the side walls comprise a resin layer, a paper layer and the metal film; and two side surfaces of the metal film are respectively connected with the resin layer and the paper layer.

In an embodiment of the present invention, the bottom 1 is a quadrangle, the four side portions 2 are connected by four folding portions 3, and the folding portions 3 are folded to make the two adjacent side portions 2 adjacent to each other, so that the bottom 1, the side portions 2 and the folding portions 3 form an open square paper pot. Of course, as other embodiments of the present invention, the bottom 1 may be another polygon such as triangle, pentagon, etc., and the bottom 1 is connected with a corresponding number of the side portions 2 and the folding portions 3 to form a paper pot with an open polygonal inner space.

The paper pot provided by the embodiment of the invention is adapted to the quadrangular bottom 1, the four folding parts 3 are provided with the folding structures 4, wherein the connection part of the folding part 3 and the side part 2 is provided with a first folding structure 41 and a second folding structure 43, and a third folding structure 42 is further arranged between the first folding structure 41 and the second folding structure 43.

The first and third

folding structures

41, 42 form a first fold-in surface 44 and a first fold-out surface 45, and the second and third

folding structures

43, 42 form a second fold-in surface 46 and a second fold-out surface 47.

In one embodiment of the present invention, when each folded portion 3 is folded, the first folded-in surface 44 may be connected to the second folded-in surface 46, the first folded-out surface 45 may be connected to the outside of the side portion 2, or the second folded-out surface 47 may be connected to the outside of the side portion 2, so that an inner space with an opening may be formed between the bottom portion 1, the side portion 2, and the folded portion 3.

As another embodiment of the present invention, when each folded portion 3 is folded, the first outer fold surface 45 may be connected to the second outer fold surface 47, the first inner fold surface 44 may be connected to the inside of the side portion 2, or the second inner fold surface 46 may be connected to the inside of the side portion 2, thereby forming an inner space with an opening between the bottom portion 1, the side portion 2, and the folded portion 3.

As another embodiment of the present invention, when a part of the folded portion 3 is folded, the first folded-in surface 44 may be connected to the second folded-in surface 46, the first folded-out surface 45 may be connected to the outside of the side portion 2, or the second folded-out surface 47 may be connected to the outside of the side portion 2. When the other folded portion 3 is folded, the first folded-out surface 45 is connected to the second folded-out surface 47, the first folded-in surface 44 is connected to the inside of the side portion 2, or the second folded-in surface 46 is connected to the inside of the side portion 2, thereby forming an inner space with an opening between the bottom portion 1, the side portion 2, and the folded portion 3.

In order to make it possible to adjust the size of the opening of the internal space formed between the bottom 1, the side 2 and the fold 3, the angle a of the first 41 and third 42 folds and of the second 43 and third 42 folds is set between 25 ° and 45 °; the angle of the third fold 42 with respect to the two angles B of the upper edge line of the fold 3 is set between 45 ° and 75 °; the angle C of the first folding structure 41 to said bottom 1 and the second folding structure 43 to the bottom 1 is set at an angle of 85-110. By adjusting the size of the angles a, B and C, the size of the opening of the inner space formed between the bottom 1, the side 2 and the folded portion 3 can be changed.

In a most preferred embodiment of the present invention, the angle a is set to 30 °, the angle B is set to 75 °, and the angle C is set to 105 °. The pot wall of the folded paper pot is slightly inclined outwards, so that the capacity of the paper pot can be increased, and the inner and outer upper edges of the paper pot can be kept flush.

Of course, as another preferred embodiment of the present invention, the angle a is set to 45 °, the angle B is set to 45 °, and the angle C is set to 90 °. The pot wall of the folded paper pot is vertical, so that the lifting strength of the paper pot can be improved, and the distortion of the paper pot when the paper pot is held is reduced.

In addition, as an embodiment of the present invention, the angle a of the upper edge of the folded portion 3 is an obtuse angle, and the size of the angle a is set to be smaller than or equal to the angles b and d of the upper edge of the folded portion 3 and the upper edge of the side portion 2. This allows the upper edge of the folded paper pot to remain flush, even with the outer upper edge higher than the inner upper edge, so that the soup in the paper pot does not overflow along the inner wall of the paper pot. In order to achieve better strength and anti-overflow effect, in the embodiment of the present invention, the length of the third folding structure 42 is greater than or equal to the length of the first folding structure 41 and the second folding structure 43. Therefore, the folded shape of the paper pot can be better restrained, the occurrence of liquid leakage is reduced, and the lifting strength is enhanced.

Based on the above-mentioned idea, if the cost is also reduced, in the embodiment of the present invention, the angle a of the two upper edges of the folded portion 3 can be set to be larger than the angles b and d of the upper edges of the folded portion 3 and the upper edges of the side portion 2, and the outer end of the third folding structure 42 is higher than the water line of the paper pot after being folded. Therefore, the water level line is taken as a reference, unnecessary material loss is reduced, and the purposes of reducing or preventing liquid leakage and reducing cost are achieved. Also, in order to further reduce the cost without reducing the cooking effect, in the embodiment of the present invention, the metal layer of the sidewall may be disposed at the water line of the sidewall, and if the sidewall is heated by electromagnetic induction, the original effect may be achieved, and the loss of the metal layer is reduced. It will be appreciated that without the metal layer, the innermost resin layer would still need to be fully covered in order to meet the specifications for leak resistance and food containers. However, in an extreme case, a resin layer may be provided following the metal layer.

Meanwhile, the reinforcing ribs are arranged on the inner side wall of the side part 2, so that the overall strength of the paper pot can be enhanced, and the paper pot can be prevented from being excessively deformed. As a specific embodiment of the invention, the reinforcing ribs are parallel to the bottom part 1 and are arranged on the inner side walls of the side parts 2 at equal distances from the bottom part 1, so that the strength of the paper pot can be enhanced, and when the paper pot contains food, the reinforcing ribs can also serve as the highest water level line and can also serve as a liquid level reminding function.

Because the paper pot can not be filled with soup, the upper edge of the folded paper pot can be ensured to be higher than the highest water level line through the set angle a according to the action of the highest water level line played by the reinforcing ribs.

As another embodiment of the present invention, the folding structure 4 of the folding part 3 may also adopt other suitable folding structures to match with the bottom part 1 of other polygonal shapes such as triangle, pentagon, etc., and when the folding part 3 is folded, the bottom part 1, the corresponding number of side parts 2 and the corresponding number of folding parts 3 are connected together to form a paper pot with an open polygonal inner space.

Referring to fig. 3, when the folded portion 3 is unfolded, the bottom portion 1, the side portion 2, and the folded portion 3 in the unfolded state are on the same plane. Can be in large batches stack together like this, conveniently carry and transport, simultaneously, by the folding paper pot that forms of plane state, can be in batches, swift compound when producing its composite bed that includes metal level, resin layer and ply, and the composite bed that is in the plane state makes things convenient for the production machine to carry out batch cutting. When the paper pot is needed, the folding part 3 is folded according to the folding method, and the inner space with the opening, which is composed of the bottom part 1, the side part 2 and the folding part 3, can be formed. Not only is convenient to carry and transport, but also is convenient and quick to use.

In one embodiment of the present invention, the bottom 1, or the side wall formed by the side portion 2 and the folded portion 3, or the bottom 1 and the side wall are formed by a resin layer, a metal layer and a paper layer, and both side surfaces of the metal layer are connected to the resin layer and the paper layer, respectively. Because the paper layer forming the bottom 1 and the side wall is provided with the metal layer, the strength of the paper pot is enhanced, the leakage is prevented, the paper pot can be directly heated by open fire or placed on an electromagnetic oven or in a microwave oven for electromagnetic heating, the instant cooking is realized, and the use is very convenient. And in order to ensure the edible safety, a food-grade resin layer is also arranged on the metal layer. In another embodiment of the present invention, the metal layer is connected with the resin layer and the paper layer through the adhesive film.

Referring to fig. 4, as an embodiment of the present invention, a coupling portion 9 for coupling the folded portion 3 with the side portion 2 is provided between the folded portion 3 and the side portion 2. The connection portion 9 may be disposed on the first folded-out surface 45, the second folded-out surface 47 or/and the outer side surface of the side portion 2, and when the first folded-in surface 44 is connected to the second folded-in surface 46, the first folded-out surface 45 is connected to the outer side of the side portion 2 through the connection portion 9, or the second folded-out surface 47 is connected to the outer side of the side portion 2 through the connection portion 9, thereby forming a paper pot with an opening, which is composed of the bottom portion 1, the side portion 2 and the folded portion 3.

As another connection mode of the present invention, the connection portion 9 may be provided on the first folded-in surface 44, the second folded-in surface 46 or/and the inner surface of the side portion 2, and when the first folded-out surface 45 is connected to the second folded-out surface 47, the first folded-in surface 44 is connected to the inner side of the side portion 2 through the connection portion 9, or the second folded-in surface 46 is connected to the inner side of the side portion 2 through the connection portion 9, thereby forming a paper pot with an opening composed of the bottom portion 1, the side portion 2 and the folded portion 3.

As still another connection mode of the present invention, the first folded-in surface 44 of a part of the folded portion 3 may be connected to the second folded-in surface 46, the first folded-out surface 45 may be connected to the outside of the side portion 2, or the second folded-out surface 47 may be connected to the outside of the side portion 2; and the first outer folding surface 45 and the second outer folding surface 47 of the other part folding part 3 are connected, the first inner folding surface 44 and the inner side of the side part 2 are connected, or the second inner folding surface 46 and the inner side of the side part 2 are connected, and correspondingly, a part of the combination part 9 is arranged on the first outer folding surface 45, the second outer folding surface 47 or/and the outer side of the side part 2, and the other part of the combination part 9 is arranged on the first inner folding surface 44, the second inner folding surface 46 or/and the inner side of the side part 2. Thus forming a paper pot with an opening consisting of a bottom part 1, side parts 2 and a folded part 3.

In an embodiment of the present invention, the joint 9 is a clip strip disposed on the first folded-in surface 44, the second folded-in surface 46, the first folded-out surface 45 or/and the second folded-out surface 47, and a clip groove disposed on the inner surface or/and the outer surface of the side portion 2, but it is also possible that the clip groove is disposed on the first folded-in surface 44, the second folded-in surface 46, the first folded-out surface 45 or/and the second folded-out surface 47, and the clip strip is disposed on the inner surface or/and the outer surface of the side portion 2. When in connection, the clamping strip is clamped on the clamping groove, so that the folded folding part 3 is clamped with the side part 2.

As another embodiment of the present invention, the joining portion 9 may be a double-sided tape, and the folded portion 3 and the side portion 2 may be adhered together by the double-sided tape. Of course, the joint 9 may be a clip member such as a pin, and directly clip the folded portion 3 and the side portion together.

The above-mentioned joint 9 is only an example of the present invention, and the embodiment of the present invention is not limited thereto. It will be appreciated by those skilled in the art that the combination 9, which can connect the side portion 2 and the folded portion 3 together, is included in the present embodiment.

In order to facilitate taking the paper pot, two opposite side parts 2 in the side parts 2 are provided with handle parts, and the handle parts are connected to the edges of the side parts 2 in a foldable manner and can be flexibly folded. And, be provided with protruding structure on the handle portion, frictional force when can increase and take plays anti-skidding effect.

In addition, still be provided with the tableware on the handle portion and place the mouth for place tableware such as chopsticks or ladle, the user of being convenient for uses chopsticks or ladle to stir food at the in-process of culinary art to and be convenient for provide the place of placing for chopsticks or ladle when drawing the paper pot, and the tableware is placed the mouth and is the structure that expands from top to bottom, and chopsticks or ladle are placed and be difficult to drop on the mouth is placed to the tableware like this.

In another embodiment of the invention, a metal layer is partially laid on the side 2 of the paper pot; or, a metal layer is arranged at the part of the side part 2 connected with the pan bottom; be provided with the waterline on the lateral wall, the metal level is laid to waterline department from the part of being connected with the bottom of a boiler, and lateral part 2 is higher than the part of waterline and does not set up the metal level, can save the cost, avoids the upper portion heating of lateral wall moreover and leads to inconvenient paper pot of extracting.

In another embodiment of the present invention, the paper pot further comprises a pot cover; the pot cover is covered on the opening of the paper pot; the heat loss and the water loss caused by steam loss in the cooking process can be reduced, and the cooking taste is kept; the pot cover is provided with an orifice for water injection of the food machine, so that the situation that a user is injured by hot water due to water splashing caused by water sprayed to the pot wall or food in the water injection process is prevented.

The manufacturing method of the paper pot provided by the embodiment of the invention comprises the following steps:

the metal film, the food-grade resin layer and the paper layer are provided in the embodiment of the invention.

The resin layer, the metal film and the paper layer are compounded together to form a composite layer according to the sequence of the food-grade resin layer, the metal film and the paper layer from inside to outside.

As one embodiment of the present invention, a composite layer may be formed by laminating a resin layer, a metal film and a paper layer, which are food-grade in this order from the inside to the outside, together.

In another embodiment of the present invention, the resin layer, the metal film and the paper layer may be bonded in this order from the inside to the outside to form a composite layer.

Then, the area of the required composite layer is calculated according to the preset size of the paper pot. And then cutting one composite layer according to the area size of the required composite layer.

Finally, the cut composite layers are placed on a die to be punched, and the bottom portion 1, the side portion 2 and the folded portion 3 can be punched on the composite layers, wherein the folded portion 3 is punched in advance to form the first folded structure 41, the third folded structure 42 and the second folded structure 43. When the folding paper is not used, the bottom 1, the side 2 and the folding part 3 are positioned on the same plane to form a piece of paper, so that the folding paper does not occupy space and is convenient for batch packaging and transportation. When the food heating device is used, the food heating device can be folded into a paper pot which can be used for packaging food or containing liquid food and heating the food by simply folding the paper pot. The use is very convenient and fast. And because the composite layer of the paper pot has the metal layer, the paper pot does not leak, and the strength can completely meet the use requirement. Meanwhile, due to the good heat-conducting property of the metal layer, the paper pot can improve the cooking efficiency when being heated and cooked, and is greatly convenient to use.

As shown in fig. 5 and 6, the embodiment of the present invention provides a paper pot, which comprises a bottom wall 1; and a side wall 2 connected to the bottom wall 1; the side wall 2 may include a side portion 21, a transition portion 22 and a folded portion 23, and an upper edge of the side portion 21, an upper edge of the transition portion 22 and an upper edge of the folded portion 23 are bent in the same direction to form the fixing portion 3.

The paper pot provided by the embodiment of the invention can be approximately in a square structure as a whole, the bottom wall 1 of the paper pot can be square, the number of the side parts 21 of the side wall 2 can be four, the side parts are opposite to each other in pairs, the transition part 22 can be positioned between the two adjacent side parts 21, so that the area of the top end of the side wall 2 can be larger than that of the bottom end of the side wall, the paper pot is convenient to use, meanwhile, the transition part 22 can be in a plane shape, the cross section of the paper pot can be octagonal, the volume of the paper pot is increased, and more food can be contained. In addition, when folding, fold portion 23, can form fixed part 3 through bending the upper edge of lateral part 21, transition portion 22 and folded portion 23 syntropy again after folding for the stable in structure of paper pot, it is convenient to fold.

The paper pot provided by the embodiment of the invention comprises a bottom wall and a side wall connected with the bottom wall; the side wall comprises a side part, a transition part and a folding part, and the upper edge of the side part, the upper edge of the transition part and the upper edge of the folding part are bent in the same direction to form a fixing part, so that when the paper pot needs to contain food, the folding part can be folded, and then the upper edges of the side part, the transition part and the folding part are bent in the same direction to form the fixing part, so that the folding of the paper pot can be completed; when needs carry, can be with the reverse bending of the upper edge of lateral part, transition portion and folding portion for the fixed part is disassembled, then opens folding portion, can realize taking apart the paper pot, thereby has reduced the volume of paper pot, convenient to carry.

In an alternative embodiment, see fig. 5 and 6, the side portions 21 and the transition portions 22 may be connected by folding of the fold portions 23. That is, when the paper pot is folded, the folding part 23 is folded to realize the connection between the side part 21 and the transition part 22, so as to form the side wall of the paper pot, thereby facilitating the operation.

In an alternative embodiment, referring to fig. 5, the bottom wall 1, the side portions 21, the transition portion 22 and the fold 23 in the unfolded state are in the same plane. That is to say, when needing to carry, can be with the upper edge reverse bending of lateral part 21, transition portion 22 and folded portion 23 for fixed part 3 is disassembled, then opens folded portion 23 again, can make the paper pot form a piece of paper, thereby furthest has reduced the whole occupation space of paper pot, and is more convenient to carry.

Specifically, in an alternative embodiment, referring to fig. 5, the fold 23 may include a first fold 231 and a second fold 232 connected to each other; the first folding structure 231 may be connected with the transition portion 22 and the second folding structure 232 may be connected with the side portion 21.

In the above embodiment, the first folding structure 231 and the second folding structure 232 may have various structural forms as long as the side portion 21 and the transition portion 22 can be connected to each other after being folded, and in this embodiment, the first folding structure 231 may include a folding wing 231b connected between the transition portion 22 and the side portion 21, and a first folding fold 231a disposed at the connection position of the transition portion 22 and the folding wing 231 b;

and the second folding structure 232 may include a second fold provided between the folding wing 231 and the side portion 21.

According to the above embodiment, referring to fig. 5 and 6, the side portion 21 and the transition portion 22 may be folded by the first fold line 231a and the second fold line such that the inner surface of the folding wing 231b may be connected with the inner surface of the transition portion 22 and the outer surface of the folding wing 231b may be connected with the outer surface of the side portion 21; of course, the inner surface of the folding wing 231b can be connected with the inner surface of the side portion 21, and the outer surface of the folding wing 231b can be connected with the outer surface of the transition portion 22, so that the connection between the side portion 21 and the transition portion 23 can be realized.

It should be noted that, referring to fig. 6, in order to facilitate the fixing of the paper pot after the folding is completed, in the first folding structure 231 of the two folding portions 23 located at the two sides of the transition portion 23, the inner surfaces of the folding wings 231b may be connected with the inner surface of the transition portion 22, and the outer surfaces of the folding wings 231b are connected with the outer surface of the side portion 21, so that after the folding of each folding portion 23 is completed, the upper edge of the side portion 21, the upper edge of the transition portion 22, and the upper edge of the folding portion 23 are bent in the same direction to form a firmer fixing portion 3, thereby making the structure of the paper pot more stable.

In order to further improve the convenience of the paper pot, referring to fig. 6, in an alternative embodiment, the fixing portion 3 may extend along the upper edge of the side wall 2 to form a handle portion, and the fixing portion 3 may extend and curl outward, so that the fixing portion 3 forms the handle portion of the paper pot, and when the paper pot is used, a user can take the paper pot through the handle portion to avoid being burned, thereby further improving the convenience of the paper pot and improving the user experience.

In an alternative embodiment, see fig. 5 and 6, a raised area 11 may be provided in the middle of the inner surface of the bottom wall 1; the contour of the raised area 11 can be adapted to the contour of the bottom wall 1. No matter the heating source is electromagnetic heating, open fire heating or other heating modes, the middle temperature of the container for containing food is always the highest, in the embodiment, in order to avoid the situation that food in the pot is burnt due to overhigh middle temperature of the bottom wall 1 of the paper pot, the middle part of the inner surface of the bottom wall 1 is provided with the protruding area 11, so that the distance between the inner surface of the middle part of the bottom wall 1 and the heating source is increased through the protruding area 11, the distance between the food positioned in the middle part of the paper pot and the heating source is increased, the overhigh middle temperature of the bottom wall is further avoided, and the situation that the food is burnt is avoided.

In an alternative embodiment, see fig. 5 and 6, a third fold 4 may be provided between the bottom wall 1 and the side portion 21, and a fourth fold 5 may be provided between the bottom wall 1 and the transition portion 22; the third fold 4 may be linear; the fourth folding mark 5 is connected with the third folding mark 4 and is in a convex arc shape; the transition 22 is an arc-shaped wall adapted to the fourth fold 5.

In the above embodiment, by providing the third fold 4 and the fourth fold 5 between the bottom wall 1 and the side portion 21 and between the bottom wall 1 and the transition portion 22, the side portion 21 and the transition portion 22 can be folded conveniently by the third fold 4 and the fourth fold 5 even in the state where the bottom wall 1, the side portion 21, the transition portion 22 and the folded portion 23 are all unfolded, so that the folding of the paper pot is more convenient and faster. Specifically, third crease 4 can be the straight line form, and fourth crease 5 is connected and is the arc of evagination with third crease 4 to make two adjacent lateral parts 21 can pass through transition portion 22 rounding off, and then make paper pot lateral wall 2 not have the edges and corners, further improved its convenient to use nature.

In an alternative embodiment, the bottom wall 1 and/or the side wall 2 may comprise a resin layer, a metal layer and a paper layer connected in sequence; alternatively, the side wall 2 comprises a resin layer and a paper layer. In this embodiment, the metal layer can be set up to the internal surface of paper pot again to make this paper pot can carry out electromagnetic heating and boil the food, can also prevent seepage, can also improve the ductility of this paper pot. Moreover, a resin layer can be arranged above the metal layer, and the resin layer is an edible resin layer so as to improve the use safety of the paper pot.

The embodiment of the invention provides cooking equipment which comprises the paper pot.

The embodiment of the invention provides cooking equipment, which comprises a paper pot, a cooking device and a cooking device, wherein the paper pot comprises a bottom wall and a side wall connected with the bottom wall; the side wall comprises a side part, a transition part and a folding part, and the upper edge of the side part, the upper edge of the transition part and the upper edge of the folding part are bent in the same direction to form a fixing part, so that when the paper pot needs to contain food, the folding part can be folded, and then the upper edges of the side part, the transition part and the folding part are bent in the same direction to form the fixing part, so that the folding of the paper pot can be completed; when needs carry, can be with the reverse bending of the upper edge of lateral part, transition portion and folding portion for the fixed part is disassembled, then opens folding portion, can realize taking apart the paper pot, thereby has reduced the volume of paper pot, convenient to carry.

Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.

Claims

1. A metal film is applied to a composite layer of a paper pot and is characterized in that the metal film comprises Al0.021-0.022mg/cm²,Fe 0.015-0.016mg/cm²。

2. The metal film of claim 1, further comprising: si 0.0003-0.0005mg/cm²，K 0.001-0.002mg/cm²，Ca 0.0003-0.0005mg/cm²。

3. The metal film of claim 1, wherein the metal film comprises Al 0.0204mg/cm²,Si0.0004mg/cm²，K 0.0013mg/cm²，Ca 0.0004mg/cm²，Fe 0.0144mg/cm²。

4. The metal film according to any one of claims 1 to 3, wherein the thickness of the metal film is 0.0001 to 0.001 mm.

5. A paper pot is characterized by comprising a bottom; a sidewall connected to the bottom; the bottom and/or the side walls comprise a resin layer, a paper layer and a metal film according to any one of claims 1-4; the two side surfaces of the metal film are respectively connected with the resin layer and the paper layer;

6. The paper pot of claim 5, wherein the folding part is provided with a folding structure, wherein the folding part comprises a first inward folding surface, a first outward folding surface, a second inward folding surface and a second outward folding surface; the first inward-folded surface is connected with the second inward-folded surface, and the first outward-folded surface or the second outward-folded surface is connected with the outer side of the side part; or the first outer folding surface is connected with the second outer folding surface, and the first inner folding surface or the second inner folding surface is connected with the inner side of the side part.

7. A paper pan according to claim 6, characterized in that the folds and the side portions form angles A, B, C, a, B, d; wherein said angle A is 30 °, said angle B is 75 °, said angle C is 105 °; or, the angle a is 45 °, the angle B is 45 °, and the angle C is 90 °; the angle a of the two upper sidelines of the folding part is less than or equal to the angles b and d of the upper sidelines of the folding part and the upper sidelines of the side part; the angle a is an obtuse angle.

8. A paper pot, comprising: a bottom wall; and a side wall connected to the bottom wall; the side wall comprises a side part, a transition part and a folding part, and the upper edge of the side part, the upper edge of the transition part and the upper edge of the folding part are bent in the same direction to form a fixing part.

9. The paper pan of claim 8, wherein the fold comprises a first fold structure and a second fold structure connected to each other;

10. A paper pan as claimed in claim 8, wherein a third fold is provided between the bottom wall and the side portion, and a fourth fold is provided between the bottom wall and the transition portion;

11. A manufacturing method of a paper pot is characterized by comprising the following steps,

providing a metal film, a resin layer and a paper layer;

cutting the composite layer;

stamping the cut composite layer to form a paper pot;

wherein the metal film is the metal film according to any one of claims 1 to 4.

12. The manufacturing method according to claim 11, wherein the sequentially laminating the resin layer, the metal film and the paper layer to form a laminated layer comprises: