JPS62297112A - Manufacture of woodflour pellet utilizing waste resin film - Google Patents

Abstract

PURPOSE:To contrive to utilize waste resin films and sawdusts and provide woodflour pellets useful for the utilization of artificial stock by a method wherein waste thermoplastic resin films, which are treated with ultrasonic cleaning and regenerated and processed in the form of fluff, are directly fed to a kneader so as to be melted and blended with woodflour then heated and kneaded. CONSTITUTION:The predetermined amount of waste thermoplastic resin films, which are cleaned in an ultrasonic wave irradiating cleaning tank and regenerated and processed in the form of fluff, are directly fed to a kneader so as to be melted and at the same time the predetermined amount of separately prepared woodflour is fed to the kneader so as to be added to the films in order to heat and knead both of them. The resultant kneaded matter is introduced in an extruder so as to be extruded through the ordinary pellet-forming means and hot cut and cooled in order to manufacture pellets. Waste resin films and sawdusts, both of which have been regarded as sources of environmental pollution, can be effectively regenerated and utilized, resulting in realizing pollution prevention and at the same time an industrial activation. Further, since both films and woodflour are directly heated and kneaded in the kneader, they are uniformly mixed up with each other so as to attain a favorable scattering of the woodflour, resulting in making it possible to obtain woodflour pellets of nearly the same quality as pellets made of virgin materials.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention (Field of Industrial Application) The present invention relates to wood flour pellet granulation for the effective use of thermoplastic resin films and wood flour, which are industrial wastes. The present invention relates to a method for producing wood powder pellets that contributes to the prevention of pollution by recycling polluting waste and to providing materials for various fields such as furniture, fittings, automobile interior parts, building materials, and 0A equipment.

(Prior technology) In the conventional production of wood flour pellets mixed with thermoplastic resin, the materials used were new materials, regardless of the resin, and there was almost no use of discarded materials. .

This is because resin films that have been used for agricultural or industrial purposes and are discarded are not sufficiently treated to remove adhering dust (and even if we try to reuse them, there are restrictions on their uses, and the use of pellets is impossible. It was impossible to do so, and the wood powder obtained from waste materials such as sawdust, rings, backboards, and bark that are unavoidable during wood processing, as well as from building waste materials, can be used in special cases such as growing mushrooms. This is because most of the waste was incinerated, and there was little consideration given to its reuse.

However, recently, one of the inventors proposed an improved cleaning treatment method for waste resin film (Japanese Patent Application No. 56-1
No. 14683), the recycling of agricultural and industrial waste films has become more efficient.

This method involves crushing waste film chunks made of thermoplastic synthetic resin, immersing them in a cleaning solution, irradiating the waste film pieces with ultrasonic waves in the solution, and using the flow of the cleaning solution to remove the crushed pieces. A method of softening a lump of waste film by unwinding it in a liquid and electrophoresing it, substantially stretching out deformations such as wrinkles and hair formed and fixed on the waste film, and separating and removing foreign matter on the film. In particular, the ultrasonic wave is irradiated to the waste film piece from both sides facing each other, and the cleaning liquid is made to emit a jet flow that is opposite to the waste film transport direction so as to circulate in the front and back direction with respect to the waste film transport direction. This method consists of cleaning while forcibly creating a circulating water flow, followed by thorough cleaning with a pressure shower.

At the same time, on the other hand, the use of wood flour was discussed,
Attempts have been made to use the waste resin film cleaned by the above method.

(Problems that the invention attempts to solve) The present invention addresses the above-mentioned actual situation and aims to utilize waste resin film, which has recently become a problem due to environmental destruction, and sawdust, which has no choice but to be disposed of. The present invention aims to provide wood flour pellets that are useful for the use of artificial materials in many industrial fields by converting wood flour into wood flour pellets that can be effectively processed in large quantities.

(Means for Solving the Problems) That is, the feature of the present invention that meets the above-mentioned purpose is that the waste resin film is processed by ultrasonic cleaning using the above-mentioned proposed waste resin film cleaning method and recycled into a fluff shape. The required amount of thermoplastic waste resin film is directly supplied to a kneader, melted, and used as a binder. Wood flour generated from sawdust, etc. is added and mixed into the kneader, and both are heated and kneaded, and then transferred to an extruder. The method consists of introducing, extruding, hot-cutting and cooling according to known pellet manufacturing processes to granulate wood flour pellets mixed with thermoplastic resin.

What should be noted here is that the resin film used is a waste resin film, and the use of a new resin film is not the intention of the present invention.

However, even though it is a waste resin film, it is not suitable for the use of the present invention if it is simply washed by normal cleaning, and ultrasonic waves are irradiated into the cleaning liquid from both sides in opposite directions to emit a jet flow that is opposite to the film transport direction. 3-1011 washed under circulating water, removed iron powder etc. with magnetic force, dried and stored
Square pieces of resin film or waste pellets are placed in their original form into a nozzle jet water tank equipped with ultrasonic irradiation equipment, then introduced into a brushing tank for sludge removal with a brush, passed through a dehydration compression roller, and then cut by an automatic cutting device for 30 to 30 minutes. It is effective for the work to use a 50 cm square piece of a two-rough shape (in this specification, both resin film pieces are referred to as waste resin film recycled into a fluff shape).

In addition, necessary auxiliaries when producing pellets.

When melting the resin film, a predetermined amount of the binder is simultaneously mixed into the kneader.

Furthermore, in order to obtain composite pellets in which other organic and inorganic materials are mixed, it is sufficient to mix in a predetermined amount when adding wood flour.

And the pellet manufacturing process is a normal extruder.

Granulation is performed through hot cutting and cooling processes.

Specific examples of the present invention are listed below.

(Example) Discarded greenhouse-grown agricultural vinyl chloride film was pretreated at the waste site by human inspection to remove wood chips, metal chips, leather chips, other resins, etc.
Cut it into 40cm square pieces, put it in a regulating tank, and soak it in water.
After stirring, the fish was cut into 5 fin angles using an underwater cutter equipped with a bladed cutter.

Next, this cut film piece is put into a cleaning tank,
While rinsing with water, irradiate ultrasonic waves oppositely from the sides, and
A jet of water is ejected against the flow direction of the film to unwind it and remove sludge, etc., and the resulting film pieces are separated by specific gravity.Then, the obtained film pieces are then subjected to magnetic force using a vibrator to remove iron powder, etc., and then centrifuged. Water was removed using a separator.

This was further placed in a dryer, dried, and stored in a cyclone.

On the other hand, waste sawdust generated during lumber sawing or wood cutting was heated and dried in a dryer at an appropriate temperature, and then passed through a hammer crusher to produce fine wood powder with a particle size of 80 to 100 mesos finer.

After preparing the ridges, a predetermined amount of the treated waste resin film is put into a kneader using an autorotor, heated and melted, and when the melting progresses, the pulverized wood powder is separately added. The mixture is further heated and kneaded to obtain the desired mixed viscous material, which is then passed through the pellet production line using an extruder, followed by extrusion, real cutting, and air cooling to produce pellets like normal thermoplastic resin pellets. Obtained.

The above-mentioned wood flour pellets thus obtained are mixed with other conventional resins such as polyethylene and polypropylene.

Just like when molding vinyl chloride, nylon resin, ABS resin, etc., it was put into the hopper of an injection molding machine and molded.
Various molded products were obtained under substantially the same conditions as those for each of the resins described above, without separation of the resin and wood flour or formation of bridging.

Note that the molding method was not limited to injection molding, but also extrusion molding, extrusion press, blow molding, and the like.

In addition, the mixed viscous material heated and kneaded in the kneader is directly sent to the hopper of various molding machines without continuing to the pellet production line.
If it is fed continuously, it is possible to mold various molded products such as high-quality artificial wood with little distortion under substantially the same conditions as a general resin molding machine, which is also effective.

(Effects of the Invention) As described above, the present invention utilizes waste such as discarded resin film and sawdust generated during lumber sawdust, attempts to clean the waste resin film, and employs it, and combines both into a kneader. This is a method of manufacturing wood flour pellets using an extruder that directly melts and kneads the wood in the interior of the factory.This method enables the effective and efficient recycling of waste resin films, sawdust, etc., which were traditionally thought to be a source of pollution. In addition to achieving the activation of
This makes it easy to bring out the properties of both depending on the mixing ratio and resin properties, and since both are heated and kneaded directly in a kneader, mutual compatibility is more uniform compared to the production of wood flour pellets using new materials. As a result, the wood flour is well dispersed, and even by using waste, it is possible to obtain wood flour pellets that are almost the same as new materials.

Furthermore, by adopting the present invention, economically, the cost can be reduced by 1/4 or less compared to using a new material of thermoplastic resin, and when wood flour is mixed into pellets, the cost is reduced by 175 or less. This method has a significant economical effect, and in terms of molded product quality, it is possible to obtain a product with good dimensional stability with little molding distortion, and improvement in precision is expected.

In particular, the wood powder pellets obtained by the present invention can be used as a civil engineering and construction material.
Automotive and electrical parts, ship interior materials, furniture construction materials, rf
J-machines and toys, as well as funeral and religious tools, lacquerware and OA
It can be effectively used in a wide range of applications, including equipment, works of art, and more.

Claims (1)

[Claims] 1. A predetermined amount of thermoplastic waste resin film that has been cleaned in an ultrasonic irradiation cleaning tank and recycled into a fluff shape is directly supplied to a kneader and melted, and a predetermined amount of wood flour prepared separately is placed in the kneader. After adding and heating and kneading both, the kneaded product is introduced into an extruder, and extrusion, hot cutting, and cooling are performed by ordinary pellet forming means to produce pellets. Utilization of waste resin film. Wood flour pellet manufacturing method.