JPH08243030A - Paper vessel and its producing method - Google Patents

Abstract

PURPOSE: To provide a paper vessel which can keep its shape without a saucer or a net and which has good water proofing and water retaining properties and to provide the producing method of the vessel. CONSTITUTION: This paper vessel 1 is made of multi-layered paper which has polypropylene film 8 between papers 7a and 7b. The outside part of a bottom 2 in the paper vessel 1 is stood at a bending part 5 as a side body. A step part 4 is made at the level of one third of the height of the paper vessel 1 form the bottom 2. When used, the vessel 1 is put on a heater 9 at the step part 4. Because the strength of paper vessel 1 is enhanced with polypropylene film 8, the shape of paper vessel 1 is kept without a saucer and so on. Also because the polypropylene film 8 does not pass water, water 11 in the paper vessel 1 does not come out from the paper vessel 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disposable paper pot which can be easily incinerated after use.

[0002]

2. Description of the Related Art In recent years, disposable pots such as paper pots have been used instead of clay pots. This is because disposable pots such as paper pots are easier to handle than clay pots, and have the advantage that they can be discarded as they are after use. As a conventional technique regarding a disposable pot, for example, there is one disclosed in Japanese Utility Model Laid-Open No. 4-52813.

In this prior art, a paper pot is housed in a ceramic receiving container, and a ceramic weight is placed in the paper pot. Therefore, the shape of the paper pot is held by the receiving container, and the state in which the paper pot is housed in the receiving container can be maintained by the weight made of ceramics.

Further, Japanese Utility Model Publication No. 4-41323 proposes a simple pot of metal foil. Since the simple pot is made of a metal foil sheet, it can be molded into a desired shape by, for example, deep drawing, and the shape is retained after molding. Therefore, the simple pot made of metal foil can be used without using a net, a saucer, etc. if it is shaped so that it can be supported by the stove when placed on the stove. there were.

[0005]

However, the above-mentioned conventional disposable pot has the following problems. That is, the conventional paper pot may absorb water during use and cause water leakage, or the paper may become transparent to impair the design. In addition to this, the conventional paper pot cannot hold the shape of the pot by itself when it is used, and in order to stably place it on the heating stove, separate equipment such as a saucer and a net is required. It was what I needed.

On the other hand, the simple pot of metal foil does not cause the above-mentioned problems in water resistance, water retention and shape retention. However, a simple pot formed of metal foil cannot be easily incinerated after use, and when handling it, there is a risk of cutting fingers and the like at the edge of the metal foil, which poses a safety problem. there were.

The present invention has been made by paying attention to the above-mentioned problems, and an object thereof is to maintain its shape without using a saucer, a net, etc. The object is to provide a paper pot with good and safety and a method for manufacturing the same.

[0008]

In order to achieve the above object, the invention according to claim 1 comprises a paper pot and at least one synthetic resin layer interposed between the paper sheets. The gist of the invention is that it is composed of paper with a multilayer structure.

(Paper) As used herein, "paper" is made from softwood wood pulp, hardwood wood pulp, bast fibers such as Sanmaki, Japanese pear, and Manila hemp, and synthetic fibers such as rayon, polyester, and vinylon. And, these fiber materials are strained and entangled flatly.

(Synthetic Resin) The term "synthetic resin" means polypropylene, low density polyethylene, high density polyethylene, ethylene / vinyl acetate copolymer and the like.

The gist of the invention according to claim 2 is that, in the paper pot according to claim 1, the synthetic resin layer is made of a thermoplastic polyolefin resin. (Polyolefin-based thermoplastic resin) "Polyolefin-based thermoplastic resin" includes polypropylene, low-density polyethylene, high-density polyethylene, etc., and is synthetic with the property of being easily plastically deformed when heated and reversibly cured when cooled. It is a resin.

The invention according to claim 3 is the invention according to claim 1 or 2.
The gist of the paper pot described in (1) is that the synthetic resin layer has a thickness of 20 μm or more.
By setting the thickness of the synthetic resin layer to 20 μm or more, it is possible to provide the strength capable of maintaining the shape of the paper pot. Further, in order to further increase the strength of the paper pot, it is desirable that the thickness of the synthetic resin layer is 50 μm or more.

According to a fourth aspect of the present invention, in the method of manufacturing a paper pot, paper and a thermoplastic resin are laminated, and pressure molding is performed in a state of being heated at a temperature lower than the melting point of the thermoplastic resin. Is the gist.

The reason why the melting point of the thermoplastic resin is lower than the melting point of the thermoplastic resin is that if the melting point is higher than the melting point, the thermoplastic resin layer is melted and the layer is destroyed, so that the desired molding cannot be performed and the water resistance of the paper pot is reduced. This is because the water retention is reduced.

According to a fifth aspect of the present invention, in the method for manufacturing a paper pot, after laminating paper and polypropylene, 110 ° C.
The gist is to perform pressure molding at a temperature of up to 160 ° C.

According to a sixth aspect of the present invention, in the method for manufacturing a paper pot, after stacking paper and high-density polyethylene, 80
The gist of the present invention is to perform pressure molding in the temperature range of ℃ to 120 ℃. In the invention according to claim 5 or 6, the temperature range during molding is 110 ° C to 160 ° C, respectively.
The reason why the temperature is 80 ° C. to 120 ° C. is as follows.

That is, the molding temperature is 110
This is because when the temperature is lower than 80 ° C. and 80 ° C., the polypropylene and the high-density polyethylene are not softened and the shape after molding is not retained.

On the other hand, the molding temperature is 1 each.
If higher than 60 ℃ and 120 ℃, polypropylene,
Since the melting point is higher than the melting point of high-density polyethylene, polypropylene and high-density polyethylene are melted and penetrate into paper. Therefore, polypropylene,
This is because the high-density polyethylene layer is not formed, so that the water resistance and water retention of the paper pot are lowered, and water leakage may occur during use.

[0019]

According to the invention described in claim 1, since the strength of the paper pot is increased by the synthetic resin, the shape of the paper pot is maintained even if water or cooking material is put in the paper pot. Further, according to the invention of claim 2, in which moisture in the paper pot is suppressed from leaking to the outside of the paper pot by the synthetic resin layer,
Since the synthetic resin is a polyolefin-based thermoplastic resin,
The formability when forming a paper pot and the shape retention after the forming process are improved.

According to the invention of claim 3, claim 1
Alternatively, in addition to the function of the invention described in 2, since the thickness of the layer made of a synthetic resin is 20 μm or more, the strength of the paper pot increases,
Its shape retention is improved.

According to the invention described in claim 4, since the thermoplastic resin is heated and softened at the time of molding, the paper pot is molded into a shape corresponding to the applied pressure. Since the thermoplastic resin is cured after the pressure molding, the paper pot is held in the shape at the time of the pressure molding.

According to the fifth aspect of the invention, the polypropylene is softened in the temperature range of 110 ° C. to 160 ° C., and the paper pot is formed into a shape corresponding to the applied pressure. Since polypropylene hardens after pressure molding, the paper pot is maintained in the shape at the time of pressure molding.

According to the sixth aspect of the present invention, the high-density polyethylene is softened in the temperature range of 80 ° C. to 120 ° C., and the paper pot is formed into a shape corresponding to the applied pressure. Since polypropylene hardens after pressure molding, the paper pot is maintained in the shape at the time of pressure molding.

[0024]

Embodiments of the present invention will be described below with reference to FIGS. The paper pot 1 in the present embodiment is formed and processed by hot pressing. As shown in FIG. 1, the paper pot 1 has a substantially deep dish shape and includes a bottom portion 2, a peripheral wall portion 3, a step portion 4 formed on the peripheral wall portion 3, and the like. The bottom portion 2 has a circular shape and is provided at the center of the paper pot 1 as shown in FIG. The periphery of the bottom portion 2 is a bent portion 5. The portion outside the bent portion 5 is erected,
The peripheral wall portion 3 has a substantially cylindrical shape.

A step portion 4 is formed on the peripheral wall portion 3 corresponding to a position approximately 1/3 of the height of the paper pot 1. The peripheral wall portion 3 below the step portion 4 is a first peripheral wall portion 3a. The step portion 4 is formed by horizontally extending like a flange from the upper end portion of the first peripheral wall portion 3a. Then, the step portion 4
A bent portion 6 is formed on the outer peripheral edge of the, and a portion extending above the bent portion 6 is a second peripheral wall portion 3b. The first
Each of the peripheral wall portion 3a and the second peripheral wall portion 3b has a shape in which the diameter is continuously increased from the lower portion to the upper portion.

The paper used as the material of the paper pot 1 in the present embodiment (hereinafter referred to as the multi-layered paper A) has a three-layer structure as shown in FIG. That is, the structure is such that the synthetic resin layer is interposed between the paper 7a and the paper 7b. The synthetic resin layer is composed of a polypropylene film 8 having a thickness of 50 μm. In this embodiment, polypropylene is used as the synthetic resin, which is optimum in terms of heat resistance, moldability, shape retention after molding, waterproofness, food safety, and the like.

The reason why the thickness of the polypropylene film 8 is set to 50 μm in the present embodiment is that the paper pot 1 after molding has a strength capable of retaining its shape. This is to provide sufficient water resistance, water retention and heat resistance. As described above, it is optimal that the thickness of the polypropylene film 8 is 50 μm or more. However, if the polypropylene film 8 has a thickness of 20 μm or more, there is no problem in practical use.

In this embodiment, softwood wood pulp is used as a raw material for the papers 7a and 7b, and 0.5% of polyamide epichlorohydrin resin is internally added as a wetting and strengthening agent. By internally adding the wetting and strengthening agent, the papers 7a and 7b can maintain sufficient tensile strength even if they absorb water during use. In addition, this paper 7
For a and 7b, those having small anisotropy are used in order to improve shape retention. Further, as shown in FIG. 4, the paper pot 1 of this embodiment is formed such that the paper 7a is inside the paper pot 1 and the paper 7b is outside the paper pot 1. Here, the surface of the paper 7a corresponding to the inner surface of the paper pot 1 is not subjected to size processing and is in a sizeless state. This is because if the surface of the paper 7a is sized and made smooth, moisture does not penetrate into the paper 7a and the paper 7a is in a state of containing air during heating. This is because when the paper pot 1 is heated in such a state, the temperature of the paper 7a containing air rises, and the paper 7a may be burnt.

In this embodiment, the paper pot 1 is composed of the multi-layered paper A having a three-layer structure, but here, the papers 7a and 7b are used.
It is conceivable that the paper pot 1 is made of a structure in which one of the layers is omitted, that is, a paper having a two-layer structure including a paper and a synthetic resin layer. However, such a configuration causes the following problems.

That is, in a two-layer paper pot, when the paper layer is used so that the paper layer is inside the paper pot, this paper absorbs moisture in the paper pot and a part of the paper becomes transparent. It will be. Then, a part of the paper that absorbs moisture and becomes transparent and a part that does not absorb water are generated, and the design of the paper pot 1 is significantly deteriorated.

On the other hand, when the synthetic resin layer is used inside the paper pot, the vaporized vapor in the paper pot stays on the surface of the synthetic resin layer, and there is a problem that charring occurs at that portion. is there.

As described above, when the paper pot has a two-layer structure, it has a practical problem. Therefore, in this embodiment, the paper pot has a three-layer structure. Next, a method of manufacturing the paper pot 1 having the above configuration will be described.

First, the paper 7 to which the above-mentioned wetting strengthening agent is internally added.
Sand laminating is performed by an extrusion laminator so that the polypropylene film 8 is interposed between a and 7b. Through the above steps, the multi-layer paper A having a three-layer structure is constructed.

Next, the multi-layered paper A is cut into a predetermined shape. In this embodiment, the multi-layered paper A is cut into a square of 24 cm square. Then, the cut multi-layered paper A is set in a hot press mold. And this is 130 ℃ ~ 16
Molding is carried out by maintaining the temperature in the temperature range of 0 ° C. for 2 seconds. The polypropylene film 8 has thermoplasticity and softens in the above temperature range, so that the multi-layered paper A
Is molded into a shape corresponding to the mold.

After molding, the paper pot 1 is cooled to room temperature when taken out from the mold. As a result, the polypropylene film 8 hardens, so that the paper pot 1 is held in the shape at the time of molding. In this example, the molding process is performed at 145 ° C. as the optimum molding temperature.

Further, the paper pot 1 is constructed such that the peripheral wall portion 3 is provided with the step portion 4, and the step portion 4 is formed by subjecting the hot pressing to double drawing. The operation and effect of the paper pot 1 in the present embodiment having the above configuration will be described.

FIG. 4 shows the usage state of the paper pot 1 in this embodiment. As shown in the figure, the bottom portion 2 and the first peripheral wall portion 3a corresponding to the lower portion of the paper pot 1 are inserted into the heating stove 9 through the opening 9a. And
The step portion 4 provided on the peripheral wall portion 3 of the paper pot 1 is placed on the upper end portion of the heating stove 9. The paper pot 1 has the step 4
Since it is supported on the heating stove 9, it is placed in a stable state on the heating stove 9.

Water 11 or cooking material (not shown) or the like is stored in the paper pot 1, but since the paper pot 1 of this embodiment has a large strength as described above, it retains its shape even in such a case. be able to. Therefore, there is no possibility that the paper pot 1 is deformed by the weight of the water 11 or the cooking material (not shown) and falls into the heating stove 9. Therefore, unlike the prior art, it is not necessary to use a saucer, a net or the like.

The solid fuel 10 is placed on the bottom plate 9b of the heating stove 9. When cooking is performed using the paper pot 1, the solid fuel 10 is burned to heat the bottom portion 2 and the first peripheral wall portion 3 a of the paper pot 1. Here, since the bottom portion 2 and the first peripheral wall portion 3a are constantly cooled by the water 11 in the paper pot 1, they are not heated to 100 ° C. or higher. Further, since the surface of the paper 7a has not been sized,
The paper 7a is in a state of absorbing water. Therefore, the bottom portion 2 and the first peripheral wall portion 3a are not burnt.

The paper 7 in contact with the water 11 in the paper pot 1
a absorbs the water 11. Even in this case, this paper 7
Since the wetting and strengthening agent is internally added to a as described above, there is no problem that the strength of the paper 7a is reduced and the shape of the paper pot 1 is not retained. Also, the paper 7 inside the paper pot 1
Even if a absorbs the water 11, the water 11 does not penetrate into the paper 7b outside the polypropylene film 8. Therefore, the water leakage which has been a problem in the conventional paper pot does not occur. That is, the water resistance and water retention of the paper pot 1 are improved. Further, since the paper 7b outside the paper pot 1 is always in a dry state, the design property is not impaired by making the paper pot 1 transparent.

In addition, the paper pot 1 of the present embodiment is safer than the conventional simple pot made of metal foil, since there is no risk of cutting fingers or the like at the edges during handling. Further, it can be easily incinerated after use.

Further, the paper pot 1 is formed into a shape having a step portion 4 by double drawing by hot pressing. That is, since the paper pot 1 in this embodiment is made of the multi-layered paper A having a three-layer structure in which the polypropylene film 8 is interposed between the paper 7a and the paper 7b, it is desired as in the simple pot of metal foil. It can be shaped into a shape.

Further, according to the method for manufacturing the paper pot 1 described above, it is possible to easily manufacture the paper pot 1 excellent in shape retention, water resistance, water retention and heat resistance. In particular, since the surfaces of the hot press in contact with the upper and lower molds are the papers 7a and 7b, even if the polypropylene film 8 is softened at the time of molding, the polypropylene film 8 will not be fused to both mold surfaces, Can easily remove the paper pot 1 from the mold. Therefore, the working efficiency is improved, and eventually the paper pot 1
The manufacturing cost can be reduced.

The present invention can be implemented by changing the configuration as follows in addition to the above-mentioned embodiment. (1) The peripheral wall portion 3 of the paper pot 1 may be provided with pleats by molding. With this configuration, the strength and shape retention of the paper pot 1 can be improved, and the designability can be improved.

(2) In the above embodiment, the paper pot 1 having a three-layer structure in which the polypropylene film 8 is interposed between the paper 7a and the paper 7b is used, but a paper having a multilayer structure in which a plurality of layers of the polypropylene film 8 are provided. It may be a pot.

(3) The shape of the bottom portion 2 of the paper pot 1 is not limited to a circular shape, and may be a polygonal shape. (4) Although the multi-layered paper A constituting the paper pot 1 is square in the above embodiment, it may be circular or rectangular.

Although the embodiments of the present invention have been described in detail above, technical ideas which are understood from the above embodiments and which are not described in the scope of the claims will be described below together with their effects. .

(A) A paper pot according to any one of claims 1 to 3, wherein a step portion is provided on a peripheral wall of the paper pot for mounting on the heating stove. According to this structure, in addition to the effects of the invention described in claims 1 to 3, the paper pot can be placed and used in a stable state on the heating stove.

[0049]

According to the invention described in claims 1 to 3, since the strength of the paper pot is increased by the synthetic resin, the shape of the paper pot is maintained even if water or cooking material is put in the paper pot. To be done. Therefore, the saucer, the net, etc., which are required for the conventional paper pot, are not required. In addition, since the water content in the paper pot is prevented from leaking to the outside of the paper pot by the synthetic resin layer, water leakage does not occur. Therefore, the paper pot can be made excellent in water resistance and water retention. Further, unlike the simple pot of metal foil, the paper pot of the present invention has no danger of cutting a finger or the like by its edge, and is highly safe.

In particular, according to the second aspect of the present invention, since the formability in forming the paper pot is improved, the paper pot can be formed into a desired shape, and the shape is maintained after forming. The property is improved.

Further, according to the invention described in claim 3,
The strength of the paper pot is increased and its shape retention is improved. Therefore, it is possible to increase the weight of water, cooking ingredients, etc. that can be stored in the paper pot.

Further, according to the invention described in claims 4 to 6, the shape of the paper pot can be maintained without using a pan, a net, etc., and is excellent in water resistance, water retention and safety. Can be easily manufactured.

In particular, according to the invention described in claim 5 or 6, polypropylene and high-density polyethylene soften without melting in the respective temperature ranges of 110 ° C. to 160 ° C. and 80 ° C. to 120 ° C. The formability of the pot is further improved.

[Brief description of drawings]

FIG. 1 is a front view of a paper pot according to an embodiment.

[FIG. 2] Similarly, a plan view of a paper pot.

[FIG. 3] Similarly, an enlarged cross-sectional view of a paper pot.

FIG. 4 is a cross-sectional view showing a usage state of the paper pot.

[Explanation of symbols]

1 ... Paper pot, 7a ... Paper, 7b ... Paper, 8 ... Polypropylene film (synthetic resin, polyolefin-based thermoplastic resin),
A ... Multi-layered paper.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koichi Igawa 2-3-3 Shiba, Minato-ku, Tokyo Inside Mitsubishi Aluminum Co., Ltd.

Claims (6)

[Claims] 1. A paper pot comprising a multi-layered paper having at least one synthetic resin layer interposed between the papers. 2. The paper pot according to claim 1, wherein the synthetic resin layer is made of a thermoplastic polyolefin resin. 3. The paper pot according to claim 1, wherein the synthetic resin layer has a thickness of 20 μm or more. 4. A method of manufacturing a paper pot, comprising laminating a paper and a thermoplastic resin, and then press-molding the thermoplastic resin under heating at a temperature lower than the melting point of the thermoplastic resin. 5. After laminating paper and polypropylene, 11
A method of manufacturing a paper pot, comprising performing pressure molding in a temperature range of 0 ° C to 160 ° C. 6. After laminating paper and high density polyethylene,
A method for producing a paper pot, comprising performing pressure molding in a temperature range of 80 ° C to 120 ° C.