JPH068969A - Method for forming cushioning material using used paper or pulp - Google Patents

Abstract

PURPOSE:To form a cushioning material having a complicated shape easily and with a high degree of accuracy by using pulverized used paper or pulp. CONSTITUTION:A separate mold 2 is formed for each of a plurality of plate-like blocks formable relatively easily according to the contour of the cushioning material to be produced. By using a suction air flow drawn into each mold 2 from its bottom part by a blower and a guide 3, the material 1 containing a mixture comprising the used paper or pulp previously pulverized mechanically into the form of a pile and a suitable amount of an adhesive agent is filled into the mold in a predetermined amount and in a short time to attain a required filling rate. A lid is placed on the mold 2 and the filled material 1 is maintained under a required pressure and then dried by dielectric or microwave heating. The cushioning material blocks 11-13 are taken out of their respective molds 2 and attached together into a required form.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for easily and accurately forming a cushioning material having a complicated shape by using crushed waste paper or pulp.

[0002]

2. Description of the Related Art When storing or transporting electrical products or other products (articles), the articles are packed so as not to be damaged. Especially for electrical products, etc., in order to protect the product, it is generally stored in a cardboard box, and the cushioning material formed into a shape suitable for product protection is stored with preformed polystyrene foam to further protect the corners against impact. Is used.

[0003]

The use of a styrofoam cushioning material preformed in a packaging box is extremely lightweight, inexpensive, has a good cushioning performance, and can be molded freely according to the shape of the article. There is. However, after use as a packaging cushion, it is generally discarded. This buffer material made of synthetic resin is bulky and, due to its material, does not decompose spontaneously. In addition, even if this buffer material made of synthetic resin is incinerated, it has the drawbacks that it generates high heat at the time of incineration, damages the incinerator, and is bulky and costly to recover. Therefore, there is a problem of environmental pollution due to packaging waste.

In order to solve the pollution problem of the cushioning material, a method of manufacturing the cushioning material using recyclable waste paper has been proposed. According to this method, waste paper fibers are dispersed in water, pressure-molded, dehydrated, and further heated or air-dried to produce. Since such a pulp-molded product has a high density and becomes a hard product, its cushioning property is limited as a cushioning material, and sometimes the packaged item is damaged.
Further, it is impossible to obtain a high-precision cushioning material by straining during heating and drying.

It is an object of the present invention to easily obtain a product using waste paper, which has a required cushioning property and has no distortion even in a complicated shape.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object, and according to the shape of the cushioning material to be molded, it is divided into a plurality of plate-shaped blocks which are relatively easy to form, and the molding dies are respectively formed. In each of the molds, using the suction air flow and the guide that is sucked by the blower from the inner bottom,
Mechanically crushed fluffy crushed waste paper, or pulp was mixed with an appropriate amount of adhesive and a specified amount of raw material was filled in a short time at the required filling rate, and then the mold was closed. After that, the filling material is brought into a required pressure state, dried by dielectric or microwave heating, and then bonded so as to have a required shape for forming a cushioning material block taken out from each mold. .

[0007]

The raw material is prepared by mixing an appropriate amount of an adhesive with a crushed waste paper having a soft property that is mechanically crushed in advance to give a fluffy shape, and stirring the mixture uniformly. Then, the mold for molding is divided into a plurality of blocks to form a mold into a plate shape that is relatively easy to mold depending on the shape of the cushioning material to be molded. A predetermined amount of the above-mentioned raw material, which has been measured in advance, is absorbed into the mold from the bottom surface of each mold by a blower or the like, and the generated intake airflow and the guide are used for filling. Therefore, the filling is uniform and can be performed in a short time. After that, the filling raw material is closed so that the required pressure is applied. Then, the raw material is filled into each mold under pressure, and dried by dielectric heating or microwave heating until the required water content is reached. During this drying, a negative pressure may be applied. After drying, the product is taken out from each mold, and the cushioning material products formed in blocks are adhered to each other to form a predetermined shape. For this reason, the flexibility of crushed waste paper is fully utilized, and even products with a complex shape with the desired cushioning properties can be easily obtained, and the product is distorted because it is dried in the mold. Therefore, a product with high accuracy can be obtained.

[0008]

EXAMPLES A method of forming a cushioning material using the waste paper of the present invention will be described below with reference to the illustrated examples. First, cardboard paper and other recovered waste paper are crushed by a pulp crusher to obtain crushed waste paper or crushed pulp. The crushed waste paper or pulp is fluff pulp. This cotton-like pulp is fluffy and has an extremely soft property. Next, this cotton-like pulp is mixed with an appropriate amount of a desired adhesive such as starch or vinyl acetate adjusted to a predetermined concentration, and is uniformly mixed and stirred to obtain a buffer material.

The forming mold is divided into a plurality of flat plate-shaped blocks which are easy to form according to the shape of the cushioning material to be formed. In the illustrated embodiment, the cushioning material to be molded is divided into three parts in the vertical direction, each of which has a flat plate shape, and the three layers are overlapped so as to have a required complicated shape, but this is arbitrarily set according to the shape. It is divided, and preferably, each block has the same plate thickness from one end to the other end in the same block even if the thickness is different,
This makes it possible to uniformly fill the raw material.

A large number of small holes are punched in the bottom plate 20 which is in contact with the inner bottom surface of each mold 2 thus divided, and when sucking with a blower from the bottom of each mold, the air is taken in from the open upper surface side of the mold. The airflow is generated toward the bottom of the mold,
The raw material can be filled in the mold in a short time and with a uniform thickness.

Further, a detachable guide 3 is attached to each mold 2.
Are arranged respectively. At least the inner shape of each guide 3 is the same as the inner shape of each mold 2 that faces it, that is, the shape of the mold portion 21, and the amount of the fixed amount of the raw material to be supplied before pressurization is set between the guide and the mold. The inner volume of the guide is determined so that the guide can be sufficiently stored.

When each mold 2 is dried in a post process, it is deformed,
It is made of a material that does not cause melting or the like, for example, synthetic resin, and a guide is arranged in this mold.
Is charged with the required amount of the raw material 1 determined in advance for each mold.
At this time, the suction airflow is generated in each mold by a blower toward the bottom surface of the mold, so that the entire mold is uniformly filled in a short time. Then, the raw material 1 is lightly filled in such a manner that the fibers of the cotton-like pulp are adhered to each other, and that the raw material 1 has desired voids and has a buffer property.

After filling the predetermined amount of the raw material 1 into the mold portion 21 of each mold 2 in this way, all the raw material in the guide is pushed into the mold, and the guide 3 is removed to remove the mold portion of this mold. A lid 4 formed of the same material as the mold 2 is closed so that the raw material is brought into a pressurized state. In order to evaporate the moisture contained in the raw material filled in this mold and dissipate it outside the mold, a large number of small moisture vent holes H for releasing the moisture to the extent that the filling raw material does not leak are punched in the mold, especially in the mold part. To be done. The water drain holes H are drilled not only in the mold 2 but also in the lid 4 if necessary.

The mold 2 filled with the raw material 1 under pressure is then supplied to the drying means. A microwave heating or dielectric heating machine is suitable as a drying means in order to obtain a molded product with high precision without distortion. Then, each mold is fed into this dryer, and when microwaves or high frequencies are applied for a certain period of time, the raw material inside the mold is in this electric field, so the molecules of the raw material vibrate and heat is generated by the frictional heat due to the vibration of this molecule. The raw material is heated and dried. By heating this raw material, the water contained in the raw material is vaporized to become steam,
This water vapor is discharged to the outside of the mold through the water removal hole of the mold or the lid, and the raw material is dried.

The time required for this drying is predetermined depending on the amount of the raw material used, its water content, the material of the raw material, and the like. Further, by making the inside of the dryer a negative pressure, the boiling point of water decreases, and the pressure difference caused by vaporization of water can easily guide the water inside the molded product to the outside to shorten the heating and drying time by microwave or high frequency dielectric. .

The cushioning material block pieces 11, 12 and 13 thus formed in the respective molds are dried and then taken out from the respective molds, and then the respective block pieces 11, 12 and 13 are bonded so as to have a required shape. The required cushioning material 10 is obtained by adhering to each other with an agent to form one body.

[0017]

According to the present invention, a suction airflow for sucking the fluffy crushed waste paper or pulp raw material into the mold is provided in each mold divided into a plurality of blocks in which the cushioning material to be formed is easily formed. It is filled by using, and the material is dried in the mold by microwave or high frequency dielectric heating under pressure with the lid closed, and then the buffer material block pieces taken out from the mold are pulled out from each other to be manufactured. Therefore, even if the molded product has a large wall thickness and does not distort even if it has a complicated shape, a highly accurate product can be easily obtained, and it has excellent cushioning properties as compared with the pulp molded product. It has the advantage that it can form a recyclable product without pollution.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a method of forming a cushioning material using a waste paper of the present invention on each block piece and then integrally molding the same by adhesion.

FIG. 2 is an explanatory diagram of molding a block piece of cushioning material using a mold.

FIG. 3 is an explanatory diagram of a method for filling a mold part of a mold with a buffer material.

[Explanation of symbols]

 1 Raw material 2 Type 3 Guide 4 Lid

Claims (1)

[Claims] 1. A suction method in which a molding die is divided into a plurality of plate-shaped blocks that are relatively easy to form in accordance with the shape of a cushioning material to be molded, and the inner bottom portion of each mold is sucked by a blower. Utilizing an air flow and a guide, a crushed waste paper that has been mechanically crushed and fluffy in advance, or a predetermined amount of a raw material prepared by mixing an appropriate amount of adhesive with pulp is provided in a short time and at a required filling rate. After filling, the mold is closed and the filling material is brought to the required pressure state, and the material is dried by dielectric or microwave heating, and then the buffer material block taken out from each mold is formed into the required shape. A method for forming a cushioning material using waste paper or pulp, which is characterized by being adhered.