KR20060116722A - Method of manufacturing a food container - Google Patents

Abstract

A method for manufacturing a food container is provided to reduce the use amount of the pulp by considering a global environment problem. A V-shape cutting portion(1) is formed on the rectangular shape material. Long side pieces(3,3') and short side pieces(4,4') are connected with a bottom surface(2). A concave portion(5) is formed from the bottom surface to side pieces by a molding press in order to increase the strength of the tray. A cutting member is formed with an angle of 20 to 60 degrees. The cutting member is formed with a funnel or about Y shape. The cutting line of the cutting member is reached to the corner of the container.

Description

Food storage container manufacturing method {METHOD OF MANUFACTURING A FOOD CONTAINER}

1 is a plan view showing a state before pressing of the food storage container of the present invention.

2 is a plan view showing a state before pressing of another food container of the present invention.

Figure 3 is a plan view showing a state before pressing of another food storage container of the present invention.

4 is a plan view showing a state before pressing of another food storage container of the present invention.

Fig. 5 is a perspective view showing an example of a food storage container manufactured by the method of the present invention.

6 is a perspective view showing an example of a concave mold used in the present invention.

Description of the main parts of the drawing

1, 1a, 1b, 1c: cut portion 2: bottom surface

3, 3 ', 4, 4': side piece 5: recess

6, 6 ': cutting line 7: notch

8: container 9: concave mold

10: recess 11, 11 ': rod

12 ": Guide plate 13: Corner

14: blade part

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a food storage container formed of a vegetable fiber material, and more particularly, to a method for industrially manufacturing a food storage container formed of a vegetable fiber material.

As a food storage container, such as a lunch box or tray which accommodates food, plastic materials, such as foamed polyurethane, have conventionally been used. However, since the post-treatment of plastic materials is not easy after use, a food storage container made of vegetable fiber materials is strongly demanded from the viewpoint of environmental conservation.

However, when a food fiber container made of vegetable fiber material was produced by mold molding, only a shallow, weak food container could be manufactured. In addition, the container from the pu of the pulp is formed by a method of forming an incision at four corners, standing the side pieces, pasting the edges of the side pieces at the corners, pasting them, and joining them manually. There was a flaw, which was extremely expensive. Therefore, the food storage container made from vegetable fiber materials is not yet widely used as a food storage container such as an inexpensive tray sold in supermarkets or the like.

On the other hand, paper as a vegetable fiber material is deforested, including native forests for raw materials of paper, but deforestation of native and natural forests is problematic because it destroys not only the natural ecosystem where various animals inhabit, but also the local environment.

An object of this invention is to provide the manufacturing method of the food storage container made from vegetable fiber materials which has practical strength and can be manufactured industrially cheaply.

It is another object of the present invention to provide a method for producing a food storage container made of vegetable fiber material which is inexpensive and reduces the amount of pulp used in consideration of the problem of the global environment.

The structure of this invention which concerns on the said objective is a process of forming from the 1 type, or 2 or more types of vegetable fiber materials other than a pulp and pulp from Fuji type water of predetermined size, and coating the thermoplastic resin which has a heat-sealing capability. And a step of forming a cutout for forming side pieces at the four corners of the Fuji-shaped water; and the Fuji-shaped water obtained in this way by heat pressing a pair of concave-convex press molds for food storage. The process of forming a container is provided, The said facing side piece of one side was comprised so that it may stand up earlier than the facing side piece of the other side.

Coating of the thermoplastic resin having the heat seal capability on one side (either inside or outside) of the fuji-shaped water is particularly preferable in that it can be replaced with plastic at cost and can be printed. In reality, coating on both sides is expensive in current technology and cannot be replaced by plastic.

It is preferable to form the said cutting part so that a front-end | tip part or a cutting line may reach the corner of the container bottom surface to form, It is more preferable to form in V shape of 20 degrees-60 degrees angle.

It is particularly preferable to form the cut portion in a funnel shape or in a substantially Y-shape, since leakage from the corner inner surface can be effectively prevented. It is good to do this especially when accommodating a difficult thing by water leakage.

The heat press using a metal mold | die is formed by forming a protrusion part in the one opposing part of the periphery of the opening part of the said concave metal mold, and making the side piece on one opposing protrusion part of the said Fuji water rises earlier than the other opposing side piece. The food storage container which bonded four corners can be manufactured industrially at low cost by this.

In the case of forming a container having a blade-shaped portion, the opposing protrusions are spaced apart by at least the blade-shaped portion of the container forming at least from around the recess of the concave mold.

By providing the guide member which clamps the side surface side of the said Fuji-type water in the said protrusion part or the proximal position of the said projection part, positioning of the Fuji-type water which forms a container can be performed easily, and the recessed part of the said recessed metal mold | die Positioning becomes easy by providing the guide member which one side of the other side surface side of the said Fuji type water abuts on the other opposing one of the surroundings.

Before the press, if one opposite side piece is bent and the one opposite side piece is constructed to stand up before the other opposite side piece, even if a normal mold is used, the productivity can be produced. Since it improves, it is preferable to comprise with the above.

One or two or more kinds of the pulp and the vegetable fiber material other than the pulp is preferably a mixture of the pulp and the vegetable fiber material other than the pulp in view of prevention of global environmental destruction by deforestation.

It is preferable that the vegetable fiber material other than the said pulp is reed, sugar cane, or kenaf.

It is preferable to make the ratio of the said pulp and vegetable fiber materials other than a pulp into the ratio which is 20 to 80 weight% of vegetable fiber materials other than pulp. If it is not added to this extent, the effect of protecting the environment is insufficient, and if it is more than this, it will not only be weak in strength but also easy to peel off the adhesive part.

As a thermoplastic resin which has the heat-sealing ability used for this invention, it is preferable to set it as polyethylene or polypropylene.

Next, an embodiment of the present invention will be described.

Example

The present invention consists of the following steps.

(1) It is formed of Fuji-shaped water of a predetermined size from one or two or more kinds of pulp and vegetable fiber materials other than pulp.

(2) A thermoplastic resin having a heat seal ability is applied.

(3) The cut | disconnect part which forms a side piece in the four corners of the said Fuji-shaped water is formed.

(4) The fuji-shaped water thus obtained is heated and pressed by a pair of concave-convex press molds to form a food storage container.

What is necessary is just to perform the 1st process by the well-known method of manufacturing Fuji type water from pulp. That is, what suspended the pulp in water may be Fuji-type water through a floating step, a water cut step, and a drying step. The fuji-shaped water thus obtained is cut into squares having a required size, preferably four squares with rounded corners, as shown in Figs. Fuji-type water is good to contain a water-resistant agent. Moreover, when accommodating the food which oil is exuded, it is preferable to further contain an oil-resistant agent in a water resistant agent.

As vegetable fiber materials other than the pulp used for this invention, it is preferable to use reed, sugar cane, or kenaf. Since the intensity | strength of the obtained food storage container is excellent, it is preferable to use reed especially.

In the present invention, a mixture of pulp and vegetable fiber materials other than pulp is preferable in view of protection of the global environment by deforestation.

It is preferable that the ratio of the said pulp and vegetable fiber materials other than pulp shall be 20 to 80 weight% of vegetable fiber materials other than pulp, Especially preferably, it will be 30 to 60 weight%. If it is not added to this extent, the effect of protecting the environment is insufficient, and if it is more than this, it will not only be weak in strength but also easy to peel off the adhesive part.

Although the process of coating the thermoplastic resin which has the heat-sealing ability of the 2nd process may be before forming a cut part, or after forming, in this embodiment, it is coated before forming a cut part. It is preferable to form the thermoplastic resin on one side of the inside and the outside of the Fuji-like water. This is because application to both sides prevents the supply of the container of the present invention for cost reasons and makes printing impossible on either side. Moreover, it is good to coat a thermoplastic resin on the surface which accommodates food. Coating on the surface containing the food is because invasion of liquids and the like can be prevented. As the thermoplastic resin, it is particularly preferable to use polyethylene or polypropylene.

Although content of a thermoplastic resin changes also with kinds of thermoplastic resin, it is good to set it as 2%-10%, Especially preferably, it is content of 3%-6%. Here, "content" is a percentage of "mass of heat-sealed coating agent" with respect to the total mass of Fuji-type water which apply | coated a thermoplastic resin to single side | surface.

Although the cutting part of a 3rd process may be a simple cutting line, as shown in FIG. 1, it is preferable to form in V shape of the angle of 90 degrees or less, Preferably the angle of 20 degrees-60 degrees.

Fig. 1 shows an example in which the cutout portion 1 of the third process is formed, and the V-shaped cutout portion 1 is formed in a fuji-shaped water having four corners having a rounded rectangle (rectangle). The state where the long side pieces 3 and 3 'and the short side pieces 4 and 4' are addressed to the bottom surface 2 is shown. 5 is a recess formed from the bottom surface 2 to the side pieces 3, 3 ', 4, and 4', and is formed by pressing in a mold to increase the strength of the tray to be manufactured. It is, but it is not formed in this state. In this state, it is actually as shown in FIG.

FIG. 2 shows another example in which the cutout portion of the third process is formed, and the cutout portion 6a reaches the corner of the bottom surface 2 at the V-shaped cutout portion 1 '. ) Is roughly Y-shaped (lower-case y-shaped). In such a configuration, the overlapping area of both ends of the side pieces 3, 3 ', 4, 4' close to the bottom surface 2 can be increased, so that water leakage from the corner inner surface can be effectively prevented.

Fig. 3 shows another example in which the cutout portion of the third process is formed, and the angle reaching the corner of the bottom surface 2 from the upper bottom (lower end) of the die-shaped cutout 7 is shown. Shows an example of a small V-shaped cutout 1 ", which is a funnel-shaped or approximately Y-shaped cutout 1b. With this configuration, the side pieces 3, 3 'proximate to the bottom surface 2 are shown. , 4, 4 ') Since the overlap area of both ends can be enlarged, water leakage from a corner inner surface can be prevented effectively.

Fig. 4 shows another example in which the cutout portion of the third process is formed, and the cutout portion 1c cuts the corners of the bottom surface 2 to the V-shaped cutout portion 1 ″ having a round shape. An example is shown in which the line 6 'is formed into a substantially Y-shaped (uppercase Y-shaped). In the embodiment of Fig. 2, the cutting line 6 is a cutting line extending one line of the V-shape. In the embodiment of Fig. 4, the cutting line 6 'is a cutting line extending a line dividing the angle of the V shape.

In the embodiment of Fig. 2, the cutting lines 6 may be slightly spaced apart, and in the embodiment of Fig. 3, the V-shaped cutout 1 'may be a cutting line. In addition, a V shape, a Y shape, and a funnel shape do not interfere as long as it is such a shape. In other words, the shape is not particularly limited as long as the tip corner portion or the cut line reaches the corner of the bottom surface 2.

To form the food storage container with a pair of concave-convex hot press molds of the (4) process, one opposing side piece of the Fuji-shaped water having a cut portion as shown in Figs. 1 to 4 is opposite to the other. It stands up before the side piece to make, mounts it on a concave metal mold | die, press-presses it with a convex metal mold | die from the top, forms a container, heat seals, and sticks the side pieces of four corners together, and FIG. As shown, the four corners 13 form a container 8 having a round.

Although the opposite side piece may be made to stand up first, it is preferable to raise a pair of short side pieces 4 and 4 'first from the thing which is easy to stand up. If a side piece is first stood by a paper folding machine, a container can be formed with a normal press die.

Fig. 6 shows an example of a female mold (concave mold) 9 used in the manufacture of the present invention, and the short side facing portion around the upper end of the recess 10 of the recessed mold 9 is shown in FIG. The cross-sectional square rods 11 and 11 'are fixed to face apart from the recessed part 10 slightly. Guide plates 12 and 12 'are mounted on rods 11 and 11', and guide plates 12 "are provided on rear of recessed part 10 of recessed metal mold 9.

In the Fuji-shaped water shown in Fig. 4, the short side pieces 4, 4 'are sandwiched between the guide plates 12, 12', and one side 3 (or 3 ') of the long side pieces is a guide plate ( 12 " on the recess 10 of the recessed mold 9 via rods 11 and 11 '. Thus, a male mold (convex mold) (not shown) is placed upwards. It descends from the recess, fits into the recessed part 10 of the recessed mold 9, and heat-presses.

In this case, one of the opposing side pieces 4, 4 'stands up before the other of the opposing side pieces 3, 3', so that the container shown in FIG. It can be produced in one process. In addition, as shown in FIG. 5, the blade-shaped part 14 and the recessed part 5 of the upper edge part of a container are formed by heat-pressing with a convex-convex metal mold | die.

In order to form the blade-shaped portion 14 of the upper edge portion, as shown in Fig. 6, the rods 11 and 11 'are further separated from the recessed both ends. An end portion may be formed in the concave portion 10, and a stepped portion may be formed in which the protruding mold is fitted into the concave portion, and a blade-shaped portion may be formed in the stepped portion where the concave mold and the protruding mold are in close contact.

It is also possible to put a lid on the container of this invention. In the case of delivering the lid, the lid may be delivered to the side pieces (preferably one of the side pieces 3, 3 ') shown in Figs.

As shown in Fig. 5, the four corner portions 13 have thickened Fuji-like water and are thickened by that, so that the portions forming the corner portions of the concave mold and / or the protruding mold may be cut by that much.

Although it does not specifically limit as a food storage container manufactured by the method of this invention, As a preferable thing, a bento box, a natto (cheonggukjang similar product) container, a tray, the lid of a lunch box, etc. can be mentioned.

According to the present invention, since a food storage container having a practical strength made of a vegetable fiber material can be manufactured at low cost industrially, the plastic food storage container can be sufficiently replaced, and thus, it contributes extremely to environmental conservation. .

In addition, according to the present invention, since a food storage container made of a vegetable fiber material which is inexpensive and reduces the amount of pulp used is obtained, it can contribute to preventing destruction of the global environment due to deforestation.

Claims (14)

A step of forming one or two or more kinds of vegetable fiber materials other than pulp and pulp into Fuji-shaped water having a predetermined size; Coating a thermoplastic resin having a heat seal capability; Forming a cut portion for forming side pieces at four corners of the Fuji-shaped water; A step of forming a food container or a lid of the container by heating the Fuji-shaped water obtained in this way into a pair of concave-convex press molds; The said facing side piece of one side was comprised so that it stood up earlier than the facing side piece of another side, The food storage container or the cover manufacturing method of the said container characterized by the above-mentioned. The manufacturing method according to claim 1, wherein the thermoplastic resin having the heat seal ability is coated on one side of the fuji-shaped water. The manufacturing method of Claim 1 in which the said cutting part is formed so that a front-end | tip part or a cutting line may reach the corner of the container bottom surface to form. The food storage container manufacturing method according to claim 3, wherein the cut portion is formed in a V shape having an angle of 20 ° to 60 °. 4. A method according to claim 3, wherein the cutout is formed in a funnel or approximately Y shape. The method according to claim 1, wherein a protrusion is formed in one opposing portion around the recess of the concave mold, and the side pieces on one opposing protrusion of the fuji-shaped water stand up earlier than the other opposing side pieces. Manufacturing method. The said opposing protrusion part is a manufacturing method of Claim 6 spaced apart by the blade-shaped part of the container formed at least from around the recessed part of the said recessed metal mold | die. The manufacturing method of Claim 7 which is provided with the guide member which clamps the side surface of the said Fuji-type water in the opposing protrusion part or adjacent position. The manufacturing method of Claim 8 in which the guide member which one side of the other side surface side of the said Fuji-shaped water abuts is provided in the other opposing one around the recessed part of the said concave metal mold | die. The manufacturing method according to claim 1, wherein one side member facing each other is bent before pressing, and the one member facing each other stands up earlier than the other member facing each other. The method according to claim 1, wherein one or two or more of the pulp and vegetable fiber materials other than the pulp is a mixture of pulp and vegetable fiber materials other than the pulp. The manufacturing method of Claim 11 whose vegetable fiber material other than the said pulp is reed, sugar cane, or kenaf. The production method according to claim 12, wherein the ratio of the pulp and the vegetable fiber material other than the pulp is such that the ratio of the vegetable fiber material other than the pulp is 20 to 80% by weight. The production method according to claim 1, wherein the thermoplastic resin having a heat seal ability is polyethylene or polypropylene.

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