JP2003011108A - Plant-derived material-made molded product and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plant-derived material-made molded product wherein a manufacturing cost is lower as compared with a conventional technique and a good merit which is appropriate for an environment being biodegradable is utilized. SOLUTION: Many fine pieces of plant derived materials and a sticky binder for bonding them are provided. Besides the plant derived material-made molded product injection molded therefrom and its manufacturing method are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plant-derived material molded article and a method for producing the same, and more particularly to a plant-derived material molded article using waste materials derived from plants such as grass, trees, bamboo and vegetables, and a method for producing the same. Regarding

[0002]

2. Description of the Related Art Up to now, a large amount of sawdust and planks generated from a wood processing plant, cutting material generated by pruning trees, cutting grass generated from golf courses, construction waste materials, waste paper, etc. Most of them depend on landfilling or incineration for their treatment, and the amount that is effectively utilized is small at present.

As a method of effectively utilizing these waste materials derived from plants, for example, the waste materials are finely crushed, washed and dried, and then crushed pieces are combined with a suitable binder using the binder and pressed to be molded. It is known how to do it. As the binder in this case, starch or a polymer material is generally used, and after being solidified with such a binder into a plate shape, it is pressed into a predetermined shape by a pressing machine.

[0004]

However, in the above-mentioned conventional method, since the relatively expensive polymer material is used as the binder, it is not possible to reduce the manufacturing cost, and the press using the press machine is not possible. Since the molding method is adopted, it takes a long time to mold and there is a limit in improving productivity. After all, there is a problem in that the production cost cannot be reduced, so that it is rarely used, and it is not possible to take advantage of a good environment-friendly property that it is biodegradable using a plant-derived material.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems of the prior art, and to provide a plant-derived material molded article having a significantly lower manufacturing cost than the prior art and a method for manufacturing the same.

[0006]

The above objects can be achieved by the inventions described in the claims. That is, the characteristic constitution of the molded article of plant-derived material according to the present invention is that it has a large number of strip-shaped plant-derived materials and an adhesive binder that binds them, and is injection-molded.

According to this structure, since the molded product is injection-molded and commercialized, a large amount of molded product can be produced in a short time as compared with the molded product manufactured by the conventional press molding and the like. Since it is not always necessary to use a polymer material that has high properties and is expensive to manufacture as a binder, the manufacturing cost can be significantly reduced. As a result, it is possible to provide a molded article made of a plant-derived material, which has a low production cost and can take advantage of good environmental suitability such as biodegradability.

It is preferable that the binder contains starch and one or more selected from thickening agents gellan gum, xanthan gum, locust bean gum, high methoxyl pectin, low methoxyl pectin, carrageenan and agar. .

According to this structure, by adding both the starch and the thickening substance, a high binding force can be obtained without using an expensive resin material, and the manufacturing cost can be surely reduced. The thickening substance can be selected according to the application, but xanthan gum and locust bean gum are particularly preferable.

With respect to 100 parts by weight of the plant-derived material,
It is preferable that the starch is 5 to 30 parts by weight and the thickening substance is 0.01 to 1 part by weight.

According to this constitution, if the starch is less than 5 parts by weight, the binding between the strip-shaped plant-derived materials is strengthened, and conversely, if the starch is added in excess of 30 parts by weight, the plant-derived material is added. Is not preferable because the amount of If the amount of the thickening substance is less than 0.01 part by weight, the thickening effect is not sufficient, and conversely, if it is added in excess of 1 part by weight, the increase in effect is small relative to the amount added, which is not preferable.

Further, the characteristic constitution of the method for producing a molded article of plant-derived material according to the present invention is that the plant-derived material is formed into a large number of pieces, these are mixed with an adhesive binder, and this mixture is injected into an injection molding machine. Injection molding in.

According to this structure, the injection molding method having high productivity is adopted, and it is not always necessary to use the polymer material which is expensive to manufacture as the binder. As a result, the manufacturing cost can be remarkably reduced. It is possible to provide a method for producing a molded article of a plant-derived material, which is significantly lower in production cost than the technology.

It is preferable that the binder contains starch and one or more selected from thickening agents gellan gum, xanthan gum, locust bean gum, high methoxyl pectin, low methoxyl pectin, carrageenan and agar. .

According to this structure, a high bonding force can be obtained at low cost, and the manufacturing cost can be further reduced.

With respect to 100 parts by weight of the plant-derived material,
It is preferable that the starch is 5 to 30 parts by weight and the thickening substance is 0.01 to 1 part by weight.

According to this structure, a high bonding force can be reliably obtained, the yield can be kept high, and the manufacturing cost can be further reduced.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a method for manufacturing a plant-derived material molded article according to this embodiment. In FIG. 1, a method of manufacturing a molded article using the cut grasses as a plant-derived material will be described as an example.

First of all, the collected vegetation is collected (#
1), crush to a predetermined size with a crusher to make a strip (# 2). Washing is performed to remove dust and the like adhering to the striped vegetation (# 3), and after the washing is finished, it is dried using a dryer (# 4). This drying may be natural drying such as exposing to the sun, but a large amount of plant and wood fragments may be dried in a relatively short time by using a hot air drying or freeze-drying device. The water content of the vegetation strip is
In order to improve the quality of the molded product, less is preferable,
It is at least 15% or less, more preferably 8% or less.

Next, a predetermined amount of starch and an adhesive binder are added to and mixed with the dried plant and wood strips (# 5). As the adhesive binder, thickening agents such as gellan gum, xanthan gum, locust bean gum, high methoxyl pectin, low methoxyl pectin, carrageenan and agar can be used, and a mixture of two or more of them is used. May be.

The mixture of plant and wood pieces to which the tacky binder is added becomes a sticky liquid, which is put into an injection molding machine and injection molded into a predetermined mold (# 6). After being injection-molded, it is taken out of the mold and a molded product is completed. A conventional molding machine can be used as the injection molding machine, but the temperature is controlled to stabilize the quality of the molded product, and the viscosity increases due to the presence of the thickening substance as a binder. Especially, in order to reduce the resistance of the inner surface of the injection port, it is preferable to use a molding machine equipped with an injection port made of resin having good smoothness.

[0022]

EXAMPLES Specific examples will be described below, but the present invention is not limited thereto.

Example 1 Approximately 100 kg of mowed plants and trees were used as a plant-derived material, and this was crushed into small pieces of about 1 mesh using a crusher, thoroughly washed with water, and then dried. It was cut into pieces of about 60 mesh or less using a shredder and then dried with hot air. Then, 100 parts by weight of dried shavings and 1 part of starch as a binder
0 parts by weight and 0.05 parts by weight of xanthan gum were added and mixed well. This mixture was put into an injection molding machine and the
While maintaining the temperature at 0 ° C., injection molding was performed in a mold to obtain a bottomed cylindrical dish (outer size of about 120φ × height of 50 × thickness of 3 mm). The time required from injection of the mixture to injection molding was about 5 seconds. The obtained molded product had a beautiful appearance, no defects such as flaws and scratches were found, and the molded product had sufficiently high strength and could be used as tableware.

(Example 2) In the same manner as in Example 1, 100 parts by weight of the plant and wood strips were used as a binder and starch 20 was added.
The mixture obtained by adding 0.5 part by weight of xanthan gum and 0.5 part by weight of xanthan gum was put into an injection molding machine, heated to about 80 ° C., and injection-molded in a mold to obtain the same tableware as in Example 1. The time required from injection of the mixture to injection molding was about 5 seconds. The obtained molded product had a beautiful appearance, no defects such as flaws and scratches were found, and the molded product had sufficiently high strength and could be used as tableware.

Example 3 In the same manner as in Example 1, 5 parts by weight of starch as a binder and 0.7 parts by weight of locust bean gum were added to 100 parts by weight of the plant and wood strips, and a mixture obtained was injected. It was put in a molding machine, heated to about 80 ° C., and injection-molded in a mold to obtain the same tableware as in Example 1. The time required from injection of the mixture to injection molding was about 5 seconds. The obtained molded product has a beautiful appearance,
There were no defects such as flaws and blemishes, and it was strong enough to be used as tableware.

(Example 4) In the same manner as in Example 1, 100 parts by weight of the plant and wood strips and 10 starches as a binder were used.
The mixture obtained by adding 0.3 part by weight of locust bean gum and 100 parts by weight of the locust bean gum is put into an injection molding machine, heated to about 80 ° C., and injection-molded in a mold to obtain the same tableware as in Example 1. It was The time required from injection of the mixture to injection molding was about 5 seconds. The obtained molded product has a beautiful appearance,
There were no defects such as flaws and blemishes, and it was strong enough to be used as tableware.

(Comparative Example 1) In the same manner as in Example 1, 100 parts by weight of the shavings were added to 20 parts of starch as a binder.
The mixture obtained by adding parts by weight was charged into the lower mold of the press molding machine and pressed by the upper mold to perform press molding to obtain the same tableware as in Example 1. The time required from the addition of the mixture to the press molding was about 60 seconds.

[Other Embodiments] (1) In the above-mentioned embodiment, the plant and material which have been cut are described as an example, but the plant-derived material of the present invention is not limited to this. Instead, it may be a waste material derived from a plant such as bamboo or vegetables, a paper material that has already been processed, a civil engineering construction waste material, or the like, and is not limited to the waste material.

(2) In addition to the additives shown in the above embodiment, other additives such as colorants, antibacterial agents, flame retardants, etc. are added as molding raw materials according to the application. May be molded.

(3) In the above embodiment, the tableware was used as an example of the molded product, but the use of the molded product of the present invention is not limited to this, and various product storage containers such as food container trays. It can be widely applied to boxes, daily necessities, toys, interior and exterior materials for construction, etc.

[Brief description of drawings]

FIG. 1 is a flowchart showing a method for producing a molded article of plant-derived material according to an embodiment of the present invention.

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Claims (6)

[Claims] 1. A molded article of plant-derived material, which comprises a large number of strip-shaped plant-derived materials and an adhesive binder that binds these, and injection-molds the same. 2. The binder comprises starch and one or more selected from thickening agents gellan gum, xanthan gum, locust bean gum, high methoxyl pectin, low methoxyl pectin, carrageenan and agar. A molded article made of the plant-derived material according to item 1. 3. The molding of plant-derived material according to claim 2, wherein the starch is 5 to 30 parts by weight and the thickening substance is 0.01 to 1 part by weight with respect to 100 parts by weight of the plant-derived material. Goods. 4. A process for producing a plant-derived material molded article, which comprises forming a plant-derived material into a large number of small pieces, mixing these with an adhesive binder, and injection-molding the mixture with an injection molding machine. 5. The binder comprises starch and one or more selected from thickening agents gellan gum, xanthan gum, locust bean gum, high methoxyl pectin, low methoxyl pectin, carrageenan and agar. Item 4. A method for producing a molded article made of a plant-derived material according to item 4. 6. The molding of plant-derived material according to claim 5, wherein the starch is 5 to 30 parts by weight and the thickening substance is 0.01 to 1 part by weight with respect to 100 parts by weight of the plant-derived material. Method of manufacturing goods.