JPH0630136U - Biodegradable plastic molding - Google Patents

Abstract

(57) [Summary] [Purpose] Along with dramatically promoting spontaneous decomposition, a hardened molded product can be easily obtained. [Composition] A biodegradable plastic material is mixed with a pulverized product M obtained by pulverizing a plant constituent, and molded. In this case, the amount of the pulverized material M is approximately 5 to 3 with respect to the biodegradable plastic material.
It is desirable to use it in the range of 0 weight percent and to select the particles of the pulverized material M in the range of approximately 100 μm to 1 mm in diameter. In addition, as a plant constituent, a residue of a processed plant product, particularly walnut shells, hard seed shells such as apricot seeds, and sawdust can be used.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a biodegradable plastic molded product using a biodegradable plastic material as a molding material.

[0002]

[Prior art and problems]

 Conventionally, a biodegradable plastic molded product using a biodegradable plastic material has been known. A biodegradable plastic molded product is a "degradable" plastic that decomposes naturally even when it is disposed of in the ground or in the sea, that is, due to the involvement of biological metabolism in the process of natural decomposition in the natural world. It is a high molecular compound that is converted into a molecular weight compound, and its application as, for example, a garbage bag or a food packaging bag has been drawing attention from the viewpoint of protecting the natural environment.

However, since conventional biodegradable plastic molded products do not have a biodegradability test method established, most of them do not spontaneously decompose even if they are actually disposed of in landfills, etc. As a result, there is a real problem that the rate of natural decomposition is very slow, including the fact that it is not confirmed whether it will completely decompose naturally. In addition, since many biodegradable plastic materials are natural polymers whose main component is starch, such as potatoes, the molded products become soft and hard molded products cannot be easily obtained.

The present invention solves the problems existing in such conventional techniques, and it is possible to dramatically accelerate natural decomposition and easily obtain a hardened molded product. The purpose is to provide molded products.

[0005]

[Means for Solving the Problems]

 The biodegradable plastic molded product T (for example, golf tee To) according to the present invention is characterized by being formed by mixing a crushed product M obtained by crushing a plant constituent with a biodegradable plastic material. In this case, the amount of the pulverized material M is selected in the range of approximately 5 to 30% by weight with respect to the biodegradable plastic material, and the particles of the pulverized material M are selected in the range of approximately 100 μm to 1 mm. Is desirable. In addition, as a plant constituent, a residue of a processed plant product, particularly hard seed husks such as walnut husks and apricot seeds, and sawdust can be used.

[0006]

[Action]

 According to the biodegradable plastic molded product T according to the present invention, since the biodegradable plastic P contains the pulverized product M obtained by pulverizing the constituents of plants such as walnut shells and sawdust, the biodegradable plastic P has a slow natural decomposition rate. In addition to reducing the absolute amount of degradable plastic P used, the physical state of biodegradable plastic P becomes a continuum of thin-walled parts due to the pulverized material M present inside, and the physical state of biodegradable plastic P is naturally decomposed. It is promoted. Moreover, since the pulverized material M originally uses a plant constituent, the naturally decomposed pulverized material M is naturalized as it is.

The amount of the pulverized material M is selected in the range of approximately 5 to 30% by weight with respect to the biodegradable plastic material, and the particles of the pulverized material M are in the range of approximately 100 μm to 1 millimeter. By selecting the above, good moldability in the molding process and good molding quality of the molded product can be secured.

Further, when a residue of a processed plant product, particularly hard seed husks such as walnut husks or sawdust is used as a constituent of a plant, the rigidity of the entire molded product can be easily increased and the residue can be removed. It can be effectively used as a resource.

[0009]

【Example】

 Next, preferred embodiments according to the present invention will be described in detail with reference to the drawings. The examples exemplify a golf tee To as a biodegradable plastic molded product.

(Materials Used and Amount Used) First, 1 to 1 of the ground walnut shell pulverized product M is added to a biodegradable plastic material (for example, “Martby (trade name)” manufactured by Nippon Synthetic Chemical Industry Co., Ltd.). A plurality of types of molding materials are prepared by gradually (1, 3, 5, 10, 20, ...) Mixing at a ratio of 80% by weight. As the particles of the pulverized product M, a range of approximately 100 μm to 1 mm is selected. The reason for selecting such a range is that if the particles of the pulverized material M are too small, they will not mix evenly when mixed with the biodegradable plastic material, while if they are too large, the molding quality, molded product strength, etc. This is because the

(Molding Method) The biodegradable plastic material and the crushed product M of walnut shells are uniformly mixed, and injection molding is performed using an injection molding machine. The molding conditions in this case are set according to the case of injection molding using a single biodegradable plastic material, and injection molding is performed in the same process. The mold used has a cavity capable of molding the golf tee To shown in FIG.

If necessary, liquid paraffin may be previously attached to the surface of the biodegradable plastic material (pellet). As a result, when the pulverized material M is mixed, the pulverized material M adheres to the surface of the biodegradable plastic material and can be mixed more uniformly.

(Molding Result) After the molding is completed, the golf tee To shown in FIG. 2 is obtained. In this case, as shown in FIG. 1, the solidified biodegradable plastic P is molded into a state in which the crushed product M of walnut shells remains mixed. According to the molding results, relatively good results were obtained in the range of the ratio of the pulverized material M to the biodegradable plastic material in the range of 5 to 30% by weight, and particularly the ratio of around 15% by weight. Got the best results.

Further, since the golf tee To is molded, the rigidity is low in the case of a molded product made only of a biodegradable plastic material, and it was difficult to insert it into the ground. In the case of the product, moderate rigidity was obtained and it was possible to insert it into the ground relatively easily. On the other hand, such a golf tee To naturally decomposes even if left on the golf course after the golf is finished. In particular, since the physical state of the biodegradable plastic P becomes a continuum of the thin portion due to the presence of the pulverized material M, spontaneous decomposition is promoted from the physical side. Since the pulverized product M is essentially a plant structure, it is naturalized to the natural world.

In addition, similar results were obtained by using hard seed shells such as apricot seeds instead of walnut shells. In addition, almost the same results were obtained by using shavings or pine needles. In particular, in the case of pine needles, a slender fibrous body was formed inside the biodegradable plastic P, so that good rigidity was obtained from this aspect.

Although the embodiments have been described in detail above, the present invention is not limited to such embodiments. For example, the amount of pulverized material and the particles are not limited to the exemplified values. In addition, the constituents of plants other than those exemplified can be used. In addition, the detailed structure and method can be arbitrarily changed without departing from the scope of the present invention.

[0017]

[Effect of device]

 As described above, since the biodegradable plastic molded product according to the present invention is molded by mixing the biodegradable plastic material with the crushed product obtained by crushing the plant constituent, the following remarkable effects are exhibited.

[0018] In addition to reducing the absolute amount of biodegradable plastic used, the physical state of biodegradable plastic becomes a continuum of thin-walled parts due to the pulverized material inside, which is natural from the physical aspect. The decomposition can be promoted.

The rigidity of the entire molded product can be easily increased, and the residue of the plant processed product can be effectively used as a resource.

[Brief description of drawings]

1 is a cross-sectional view taken along the line AA in FIG. 2 of a biodegradable plastic molded product according to the present invention,

FIG. 2 is a front view of the biodegradable plastic molded product (golf tee),

[Explanation of symbols]

 T Biodegradable plastic molded product To Golf tee M Crushed product P Biodegradable plastic

Claims (6)

[Scope of utility model registration request] 1. A biodegradable plastic molded article obtained by mixing a biodegradable plastic material with a crushed product obtained by crushing a plant constituent, and molding the mixture. 2. The biodegradable plastic molded product according to claim 1, wherein the amount of the pulverized product is selected in the range of approximately 5 to 30% by weight based on the biodegradable plastic material. 3. The biodegradable plastic molded product according to claim 1 or 2, wherein the particles of the crushed material are selected in a range of approximately 100 μm to 1 mm in diameter. 4. The biodegradable plastic molded product according to claim 1, wherein the plant constituent is a residue of a processed plant product. 5. The biodegradable plastic molded article according to claim 4, wherein the residue is hard seed shells such as walnut shells and apricot seeds. 6. The biodegradable plastic molded article according to claim 4, wherein the plant constituent is sawdust.