JPH03162944A - Packaging material and its manufacture - Google Patents

Abstract

PURPOSE:To eliminate cracking or tearing along the fiber even if a reinforced sheet is folded or cuts are formed therein while the appearance and characteristics of a leaf and a covering bark of a natural plant are spared by laminating a reinforced breathing sheet with the leaf or the covering bark of the natural plant. CONSTITUTION:In the case of using a bamboo sheath 1 as an example of a leaf or a covering bark of a natural plant, a section of the bamboo sheath, square in its fiber direction, is provided with a number of fine ups and downs, which are humidified and softened for the purpose of easier stretching, and the ups and down on its surface are stretched and rolled. After that, a reinforced breathing sheet 2 is laminated on the rear of the bamboo sheath 1 through a bonding agent insoluble in water. Then, the bamboo sheath 1 with which the reinforced sheet 2 is laminated is dried. Thus, a packaging material 4 which is not cracked nor torn even if the same is folded or cuts are formed thereon while quality feeling, breath ability, moisture absorbing properties and the like of the natural bamboo sheath 1 are maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a packaging material used for packaging fresh confectionery, for example, and a method for manufacturing the same.

[Conventional technology]

Conventionally, as natural plants for this type of packaging material, the leaves of turmeric, oak, cherry, bamboo grass, Japanese ginger, and the like, as well as the bark of bamboo, have been used as they are.

[Problem to be solved by the invention]

However, for example, if bamboo skin is used as is, it tends to tear along the fiber direction, so it may be deformed or
It has drawbacks such as insufficient strength, which makes it unsuitable for making cuts and processing for packaging.

Therefore, paper and plastic sheets printed with patterns of natural plant leaves and foreskin are used as substitute packaging materials that do not have the above drawbacks and have an appearance similar to natural plants.
In this case, the problem of strength can be solved by using a strong material, but in exchange, for example, appropriate moisture absorption and ventilation? ■ 2 The subtle characteristics of natural products such as naturalness, inhibition of decay by the action of enzymes, familiar feel, fragrance, and aesthetics are lost, and the image of imitation products becomes more oriented towards luxury goods, authentic ones, and even easier to become familiar with. The drawback was that it did not meet the instinctive desire of humans to seek natural materials.

The purpose of the present invention is to use natural plant leaves and foreskin, to strengthen them while taking advantage of their beauty and characteristics, and to eliminate the two drawbacks.

[Means to solve the problem]

In order to achieve this object, the characteristic structure of the packaging material according to the present invention is that a reinforcing sheet 1- having air permeability is bonded to a leaf or foreskin of a natural plant using an adhesive; The characteristic means of the manufacturing method of the packaging material is to humidify the leaves or foreskin of the natural plant in advance, stretch the undulations on the surface by rolling, and then apply a breathable reinforcing sheet to the surface using an adhesive. The purpose is to restore the undulations of the surface by bonding and then drying the leaf or foreskin.

[For production]

The packaging material according to the present invention has a reinforcing sheet with air permeability bonded to the leaves or foreskin of natural plants using an adhesive, so it has the strength to not crack or tear along the fibers even when bent or cut. In addition, the natural breathability and hygroscopicity of the leaves or foreskin are maintained, fresh air is not blocked, and the enzyme function of the leaves or foreskin of natural plants is utilized to prevent spoilage of the packaged items. It can be useful for

In addition, when manufacturing packaging materials, for example, when a reinforcing sheet is directly attached to a leaf or foreskin, the surface of the leaf or foreskin is uneven, so the contact area between the reinforcing sheet and the leaf or foreskin is as shown in Figure 2. As can be seen, since it is limited to the convex part of the leaf or foreskin, it is easy to peel off, and therefore, depending on how the packaging material is used, sufficient strength may not be obtained. A leaf or foreskin of a plant is softened by humidification in advance, and the undulations of the softened surface are stretched by rolling, and then a reinforcing sheet is attached to the surface with an adhesive. They can be laminated together so that they are in contact with each other over the entire surface, and can be reinforced more reliably over the entire surface.

In this case as well, since the reinforcing sheet is breathable, the breathability of the leaf or foreskin and the above-mentioned advantages associated therewith are not lost.

In addition, the surface undulations are restored by drying the reinforcing sheet after laminating it in the above-mentioned manner, so that the strength and
It is possible to obtain a packaging material that has the texture of a natural product while retaining the advantage of breathability.

〔effect〕

Therefore, in the packaging material according to the present invention, the breathable reinforcing sheet 1 is bonded to the leaves and foreskin of the natural plant using an adhesive, so that it can be used without impairing the air permeability of the leaves and foreskin. can be reinforced.

By maintaining breathability, fresh air and appropriate moisture absorption are ensured, and the enzyme function of natural plant leaves or foreskin can be utilized to prevent packaged items from spoiling. It is also possible to ensure that the packaged product does not swell or become too dry, retains its flavor, and maintains the aroma of the leaves and foreskin.

In addition, even if the leaves and foreskin reinforced by the reinforcing sheet are cut into arbitrary shapes, bent, or cut, they will not crack or tear along the fiber direction, and can be used in a variety of ways. It can be widely used as a shaped packaging material, for example, it can be used for packaging with elaborate sculptural ideas to increase the added value of souvenirs and the like.

Furthermore, the manufacturing method of the present invention allows the breathable reinforcing sheet and the leaf or foreskin to be laminated together so that they are in full contact with each other, so that they are reliably reinforced so that they do not peel off even when bent. In addition to being able to
By drying after bonding in this manner, the undulations of the surface can be restored and the texture of a natural product can be reproduced without impairing air permeability.

In this way, it has sufficient strength to withstand various processing, and is also practical by taking advantage of the beautiful properties of natural products, such as appropriate breathability, moisture absorption, anti-rotation effect due to enzymes, easy-to-fit texture, fragrance, and beauty. A packaging material with high quality can be obtained.

〔Example〕

An example will be described in which bamboo bark (1) is used as an example of a leaf or foreskin of a natural plant.

Bamboo skin has many fine undulations in its cross-section perpendicular to its fiber direction, as shown in Figure 1, so in order to make it easier to stretch, it is softened by humidification, and the undulations on its surface are smoothed by rolling. After stretching, a breathable reinforcing sheet (2) is attached to the bamboo skin ( Lay the back side and the entire surface of 1) together. Its cross section is shown in FIG.

After that, the reinforcing sheet (2) is attached and the bamboo skin (1) is dried for a while, thereby reproducing the undulations of the surface as shown in FIG. 4 and reliably reinforcing it. Can be done.

The method described above maintains the texture, breathability, moisture absorption, and other properties of natural bamboo skin (1), while ensuring that it does not crack or tear even when processed by bending or cutting. A packaging material (4) can be obtained.

It is also possible to use synthetic paper or non-woven fabric as the reinforcing sheet (2), but these have some difficulty in absorbing moisture, and are cheaper, stronger, transparent, and can be used for ventilation without damaging the appearance of the material. Coniferous pulp is suitable as the reinforcing sheet (2).

[Brief explanation of the drawing]

The drawings show examples of the packaging material and its manufacturing method according to the present invention, in which Figure 1 is a cross-section of bamboo skin, Figure 2 is a cross-section of bamboo skin laminated with a reinforcing sheet without pretreatment, and Figure 3 is a cross-section of bamboo skin. Figure 4 shows a cross-section of pretreated bamboo skin and a reinforcing sheet pasted on it, and Figure 4 shows a cross-section of dried bamboo skin. (1)...Leaf or foreskin, (2)...Reinforcement sheet I, (3)...Adhesive, (4)...Packaging material .

Claims (1)

[Claims] 1. A packaging material made by bonding a breathable reinforcing sheet (2) to a natural plant leaf or foreskin (1) using an adhesive (3). 2. The packaging material according to claim 1, wherein the natural plant leaf or foreskin (1) is bamboo bark. 3. The packaging material according to claim 1, wherein the reinforcing sheet (2) is attached to the back side of the leaf or foreskin (1) of the natural plant. 4. The leaf or foreskin (1) of the natural plant is humidified in advance, the undulations on its surface are stretched by rolling, and then a breathable reinforcing sheet (2) is applied to the surface via an adhesive (3).
A method for producing a packaging material, in which the surface undulations are restored by laminating the leaves or foreskin (1) together and then drying the leaf or foreskin (1). 5. The method for producing a packaging material according to claim 4, wherein the natural plant leaf or foreskin (1) is bamboo bark.