JPH106308A - Preparation of container for packaging - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make influence to environment small even if a container is disposed after use by cutting a sliced bamboo into a definite shape to prepare a thin sheet and forming this thin sheet into a specified shape by pressing it in a mold. SOLUTION: A bamboo is cut into a specified length at right angles to its axial direction to prepare a cut parent material 2. A sliced bamboo 6 is taken out of the parent material 2. The sliced bamboo 6 is cut into a definite rectangular shape by means of a cutter to prepare thin sheets 7 and 8 with a definite shape. The thin sheets 7 and 8 are bonded together to prepare a plywood. A container 12 is prepd. by pressing the plywood 10 in a mold. Burrs on the top edge part 13 of this container 12 are removed to arrange a shape. A transparent or semitransparent resin is applied thereon in accordance with applications of this container 12 for packaging.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a packaging container using bamboo.

[0002]

2. Description of the Related Art Heretofore, as a packaging container for packaging or holding food or drink such as instant noodles or lunches or daily necessities, those mainly made of a resin such as polyethylene have been widely used. However, such containers are discarded in large quantities after use, but may emit toxic gases when incinerated. There is a problem. Also,
Bamboo is one of the natural products that has few problems even if it is discarded or incinerated, and has a short time until it can be harvested once it has been harvested from its production area. And there is a packaging container using bamboo for a long time. In this device, the container is formed by weaving a bamboo that is obtained by cutting bamboo into a slender shape, or the bamboo is sliced and the shape of the bamboo itself is almost left as it is. However, with such a configuration, it is necessary to manufacture the packaging container almost by hand, and it is extremely difficult to mass-produce the packaging container. Further, the shape of the completed packaging container is limited. Therefore, a conventional container using bamboo cannot be used as a substitute for the above-mentioned resin-based packaging container.

[0003]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method for producing a packaging container which has little effect on the environment even when disposed after use, and is suitable for mass production.

[0004]

The method for producing a packaging container according to the present invention comprises the steps of thinly slicing bamboo in parallel with its axial direction, cutting the sliced bamboo into a predetermined shape to form a thin plate, Pressing the thin plate with a mold to form a predetermined shape.

[0005]

DETAILED DESCRIPTION OF THE INVENTION The method according to the first aspect of the present invention comprises the steps of thinly slicing bamboo in parallel with its axial direction, cutting the sliced bamboo into a predetermined shape to form a thin plate, and forming the thin plate with a mold. Pressing into a predetermined shape.

Therefore, a container having a desired shape can be obtained depending on the shape of the mold. Moreover, since the material is mainly bamboo, even if it is incinerated or buried in the ground after use, it does not adversely affect the environment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 and 2 are process explanatory diagrams of a method for manufacturing a packaging container according to an embodiment of the present invention.

As shown in FIG. 1A, a bamboo 1 is prepared. The bamboo 1 used has a thickness W of 10 cm or more. For example, Chinese Moso bamboo is suitable. This is because this Moso bamboo has a thickness of about 20 cm, so that sliced plate materials described later can be collectively taken out.

Next, as shown in FIG. 1 (b), the bamboo 1 is cut at a predetermined length L (usually about 2 m) at right angles to the axial direction to obtain cut base materials 2, 3. . And FIG.
As shown in (c), a container 4 containing a solution containing the insect repellent
Then, the base materials 2 and 3 are put, and the insect repellent is impregnated into the base materials 2 and 3 and boiled. As a result, the base materials 2 and 3 are less likely to stick to insects and are softened and easily processed. Then, the base materials 2 and 3 are taken out of the container 4 and dried.

Next, as shown in FIG. 1D, when the base material 2 is dried, the sliced bamboo 6 is taken out from the base material 2. That is, the slice is performed by applying the cutter 5 while rotating the base material 2 in the arrow n1 direction. In addition, although there is a skin on the outer peripheral portion of the base material 2, the skin is not used as the sliced bamboo 6 because its mechanical properties are greatly different from other portions.

[0010] Then, as shown in FIG.
Cut the sliced bamboo 6 into a fixed rectangle with cutter D,
The thin plates 7 and 8 have a fixed shape. In addition, the thin plates 7 and 8
Has a fiber orientation.

Next, the thin plates 7 and 8 are dried again (FIG. 1).
(F)) and carbonized (FIG. 1 (g)). When carbonized, the insect / mold resistance is improved, and the habit of bamboo is forced. However, depending on the use of the packaging container, the carbonization treatment may be omitted.

Next, as shown in FIG. 2A, an adhesive 9 is applied to at least one of the thin plates 8 and the thin plates 7 and 8 are bonded to form a plywood 10. As described above, although the thin plates 7 and 8 have the directionality of the fibers, when the strength of the plywood 10 is desired to be increased, the directions of the fibers of the thin plates 7 and 8 are set to be orthogonal to each other or two sheets are used. Above, it is good to stick. Also, when the plywood 10 is to be made into a complicated shape later,
When emphasis is placed on workability, the plywood 10 may be omitted and only one thin plate may be used.

Further, a thin protective layer made of resin may be interposed between the two thin plates 7 and 8. This protective layer is for reinforcing the plywood 10, and is harmless for humans and animals. In the present embodiment, two thin plates 7 and 8 are stacked, but more plate materials may be stacked as needed.

Next, as shown in FIG. 2B, the surface of the plywood 10 is polished by the polishing device 11. This allows
Fluff of the plywood 10 is removed, and the flatness of the plywood 10 is also improved.

Next, the plywood 10 is set in a mold formed in advance in accordance with the intended packaging container, and the plywood 10 is pressed with the mold to form a container 12. Here, this mold may be substantially the same as that for a conventional packaging container mainly made of resin. However, in order to manufacture the packaging container of the present embodiment, it is not necessary to inject the resin into the mold, so that it is not necessary to form a runner in the mold. Further, the workability of the plywood 10 is good, and various shapes of packaging containers can be obtained depending on the shape of the mold.

When the container 12 is obtained by a mold, the shape of the upper edge portion 13 becomes indeterminate when a packaging container as shown in FIG. 2 is manufactured, and the upper edge portion 13 usually has burrs. Therefore, as shown in FIG. 1D, the burrs of the upper edge portion 13 are removed and the molding is performed. The burrs may be cut at the same time when the mold is pressed.

Next, as shown in FIG. 1E, depending on the use of the packaging container 12, such as the outer surface of the packaging container 12,
A transparent or translucent resin 14 is coated.
When the coating is performed, the packaging container 12 is polished,
Not only does the bamboo fiber pattern appear clearly and the appearance improves, but the coating can also provide waterproofness. This makes it possible to pour a liquid such as boiling water into the packaging container 12, which is suitable for use in packaging containers for instant foods. Here, in the packaging container according to the present embodiment, since a pattern of bamboo fiber, which is a natural thing, appears, unlike a conventional packaging container mainly made of resin, the packaging container has a classy appearance rather than a tasteless and dry appearance. Appearance. Then, when the coated resin 14 is dried and fixed, a finished product is obtained (FIG. 1F).

[0018]

According to the present invention, as described above, the packaging container obtained therefrom is mainly made of bamboo, and is incinerated or buried in the ground after use of the container. However, it does not adversely affect the environment. Moreover,
It can be easily mass-produced by a press using a mold and can be subjected to flexible processing, and can be used as a substitute for a packaging container made of resin such as polyethylene with an environmentally friendly and inexpensive material.

[Brief description of the drawings]

FIG. 1 is a process explanatory view of a method for manufacturing a packaging container according to an embodiment of the present invention.

FIG. 2 is a process explanatory view of a method for manufacturing a packaging container according to an embodiment of the present invention.

[Explanation of symbols]

 1 Bamboo 7, 8 Thin plate 12 Packaging container

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location B65D 1/09 B65D 1/00 A

Claims (7)

[Claims] 1. A step of slicing bamboo thinly in parallel with its axial direction, a step of cutting the sliced bamboo into a predetermined shape to form a thin plate, and a step of pressing the thin plate with a die to form a predetermined shape. A method for producing a packaging container, comprising: 2. A step of cutting the bamboo at predetermined lengths at right angles to the axial direction, a step of impregnating the cut bamboo with an insect repellent and heating, and a step of drying the bamboo impregnated with the insect repellent. A step of thinly slicing the dried bamboo in parallel with its axial direction, a step of cutting the sliced bamboo into a fixed shape to form a thin plate, a step of drying the thin plate, and a step of carbonizing the dried thin plate; A step of polishing the surface of the polished sheet, a step of pressing the polished sheet with a mold to form a container, a step of forming a container by removing burrs of the container, and a step of applying a coating to the formed container. A method for producing a packaging container, comprising: 3. A step of cutting the bamboo at predetermined lengths at right angles to the axial direction, a step of impregnating the cut bamboo with an insect repellent and heating, and a step of drying the bamboo impregnated with the insect repellent. A step of thinly slicing the dried bamboo in parallel with its axial direction, a step of cutting the sliced bamboo into a fixed shape to form a thin plate, a step of drying the thin plate, and a step of carbonizing the dried thin plate; Bonding the polished thin plate up and down, polishing the surface of the bonded thin plate, pressing the polished thin plate with a mold into a container, and removing the burr of the container to form a container And a step of coating the formed container with a coating. 4. A step of cutting the bamboo at predetermined lengths at right angles to the axial direction thereof, a step of impregnating the cut bamboo with an insect repellent and heating, and a step of drying the bamboo impregnated with the insect repellent. A step of thinly slicing the dried bamboo in parallel with its axial direction, a step of cutting the sliced bamboo into a fixed shape to form a thin plate, a step of drying the thin plate, and a step of carbonizing the dried thin plate; Bonding the polished thin plate up and down, polishing the surface of the bonded thin plate, pressing the polished thin plate with a mold into a container, and removing the burr of the container to form a container And a method for producing a packaging container. 5. A step of cutting the bamboo at predetermined lengths at right angles to the axial direction thereof, a step of impregnating the cut bamboo with an insect repellent and heating, and a step of drying the bamboo impregnated with the insect repellent. A step of thinly slicing the dried bamboo in parallel with its axial direction, a step of cutting the sliced bamboo into a fixed shape to form a thin plate, a step of drying the thin plate, and a step of carbonizing the dried thin plate; Bonding the polished thin plate up and down, polishing the surface of the bonded thin plate, pressing the polished thin plate with a mold into a container, and applying a coating to the formed container. A method for producing a packaging container, comprising: 6. A step of cutting the bamboo at a predetermined length perpendicular to its axial direction, a step of impregnating the cut bamboo with an insect repellent and heating, and a step of drying the bamboo impregnated with the insect repellent. A step of thinly slicing the dried bamboo in parallel with its axial direction, a step of cutting the sliced bamboo into a fixed shape into a thin plate, a step of drying the thin plate, and a step of bonding the dried thin plate up and down Polishing the surface of the bonded thin plate, pressing the polished thin plate with a mold into a container, removing the burr of the container and forming the container, and coating the formed container. And a process for producing a packaging container. 7. A step of cutting the bamboo at predetermined lengths at right angles to the axial direction, a step of impregnating the cut bamboo with an insect repellent and heating, and a step of drying the bamboo impregnated with the insect repellent. A step of thinly slicing the dried bamboo in parallel with its axial direction, a step of cutting the sliced bamboo into a fixed shape to form a thin plate, a step of drying the thin plate, and a step of carbonizing the dried thin plate; Bonding the polished thin plate up and down, polishing the surface of the bonded thin plate, pressing the polished thin plate with a mold into a container, and removing the burr of the container to form a container And a step of coating the formed container with a coating.