JPH09201835A - Compression molding using shredded regenerated material and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a molding inexpensively without being adversely affected by the fluidity and the viscosity variation of a molten resin due to the difference in the content percentage of a reproduced material of paper shreds or synthetic resin film by packing the regenerated material and a new (not reproduced) thermoplastic resin into a molding die for compression molding and manufacturing a molding by compression molding under a cold pressing method. SOLUTION: This method for manufacturing a compression molding using a shredded regenerated material is composed of a step for preparing a molding material which prepares a molding material 7 by mixing shredded reproduced materials 2, 3 obtained by shredding an already available material of paper and resin or either of these, new thermoplastic resin powder and, if necessary, an assistant such as a desiccant or an oxygen absorbent, and a step to compression-mold the molding material 7 into a compression molding by cold pressure with the help of a press molding die 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste material such as waste paper or paper product, waste synthetic resin film or resin product, or a material shredded from a synthetic resin article. The present invention relates to a compression molded body manufactured by compression molding by cold pressing and a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, waste papers and paper products, paper products such as waste synthetic resin films and resin products, or waste products such as synthetic resin products that have become unnecessary are collected and recycled to form a molded product. If you want to do it, first, create a shredded recycled material by shredding the waste material that has become unnecessary into small pieces, and mix it with a synthetic resin such as a new (non-recycled) thermoplastic resin. To create.

Then, a molding is manufactured by injecting the molding material into a molding die while heating and melting the molding material in an insert injection molding device to perform molding.

[0004]

Generally, in an injection molding system in which an insert injection molding apparatus heats and melts and injects into a mold for molding to perform a molding process, strictness is required when a molding material is injection molded. A high fluidity and viscosity are required.

Therefore, in the production of a molded article by an injection molding method using a molding material mixed with the conventional shredded recycled material, the shredded material is shredded to the extent that the proper fluidity and melt viscosity required for injection molding are not impaired. It is necessary to create a molding material while suppressing the content of recycled material, and there is a limit to the content rate of shredded recycled material that is recycled from ready-made materials for molding material, New resin was needed.

Further, when plasticizing by heating for injection molding of the molding material, the degree of thermal deterioration of the paper shredded into small pieces of shredded recycled material mixed with nascent resin, and synthetic resin. Subtle changes in viscosity and fluctuations in viscosity are likely to occur due to the degree of melting of the film, making it difficult to control fluidity and melt viscosity.

Further, in the production of a molded product by conventional injection molding using a molding material containing a shredded recycled material, a considerably high heat is applied in order to ensure proper fluidity and melt viscosity at the time of injection molding. Since it is necessary to melt and then to inject, a large amount of cost is required to manufacture a molded body by an injection molding method using a recycled material.

According to the present invention, a shredded reclaimed material is melted by melting the molding material containing the shredded reclaimed material by frictional heat or plastic deformation heat caused by cold pressurization at room temperature or the like without external heating operation. An object of the present invention is to make it possible to manufacture a molded product satisfactorily and inexpensively without being affected by the change in the fluidity or melt viscosity of the molding material due to the content rate.

[0009]

Means for Solving the Problems A first invention of the present invention is:
It is compression molded into a predetermined molded body using a molding material obtained by mixing shredded recycled material of paper and / or resin shredded into small pieces and new resin powder. A compression molded product using a shredded recycled material.

The present invention also provides a compression molded body using the shredded recycled material of the first invention, wherein the molding material contains an appropriate amount of an auxiliary material such as a desiccant or an oxygen absorbent. It is a compression molded product using a recycled material.

The present invention also provides a compression molded article using the shredded recycled material of the first invention, wherein the shredded recycled material contains an appropriate amount of paper powder in the molding material. Is.

A second invention of the present invention is to provide a shredded recycled material and a new thermoplastic resin powder prepared by shredding an existing material made of paper and / or resin into small pieces. Shredding reproduction characterized by being manufactured by a molding material forming step of mixing and forming a molding material, and a molded body compression molding step of compression molding the molding material into a molded body using a press die. It is a method for producing a compression molded body using a material.

The present invention also provides a method for producing a compression molded body using the shredded recycled material according to the second aspect of the present invention, wherein the shredded recycled material and the new thermoplastic resin powder are mixed in the molding material preparing step. It is a method for producing a compression molded product using a shredded recycled material in which a molding material formed by mixing is mixed with an appropriate amount of an auxiliary material such as a desiccant or an oxygen absorbent or / and an appropriate amount of paper powder.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION

[First Invention] The compression molded article of the present invention will be described in detail below in accordance with an embodiment.
1B is a side sectional view showing an example of the compression molded body 1 of the present invention, and FIG. 1C is a perspective view.

The compression molded body 1 of the present invention is, as shown in the drawing, shredded and regenerated by cutting a resin article such as a synthetic resin film (unused waste resin material) into small pieces. Shredded material 2 or shredded recycled material 3 made by shredding waste paper articles (waste paper ready-made materials) into small pieces, and new (non-recycled) thermoplastic resin The powder 4 is mixed with the powder 4 and molded into a compression-molded body having an appropriate shape by compression molding by a cold pressing method. The shredded reclaimed materials 2 and 3 may be shredded reclaimed materials prepared by using a composite ready-made material such as a piece of waste paper and a resin that is no longer needed.

The thermoplastic resin powder 4 is made of polyethylene, ethylene vinyl acetate (EVA), polypropylene,
Styrene butadiene rubber, polyvinyl chloride, acrylic,
Thermoplastic resin powder represented by polyethylene terephthalate, polystyrene, polycarbonate, or the like, or thermoplastic resin powder or small particle size (particle diameter: 0.01 to 1 mm) made of a thermoplastic resin in which any of these resins is mixed.
The following) are thermoplastic resin pellets.

In the layer of the molded body 1, when the shredded recycled material 2 used for the molding process is a thermoplastic resin, all or more than half of the shredded recycled material 2 is a thermoplastic resin. Along with the powder 4, it is thermally melted by compression friction heat and plastic deformation heat generated by cold pressurization in the molding die, and the cold pressurization compression condition (for example, pressure, pressurization speed,
Depending on the compression method such as uniaxial compression or isotropic compression, and the preheating temperature of 100 ° C. or less)
The outer part (surface layer part) or the outer part to the inner part is in close contact with each other.

Depending on the cold press compression conditions, the shredded reclaimed material 2 in the form of small pieces is not completely adhered to each other in the inside or the outside of the molded body 1 and the minute voids are not completely adhered to each other. Are formed.

Therefore, the inside of the molded body 1 has a porous state, has a small bulk specific gravity and is relatively lightweight, and the layer of the molded body 1 has good air circulation and good combustibility. For example, it has a structure that can be easily incinerated and discarded during incineration.

In the molded product of the present invention, as the shredded recycled material 2, for example, a synthetic resin mainly containing a thermoplastic resin is used, and it is preferable that all of the synthetic resin is a thermoplastic resin. The shredded recycled material 2 may include a small piece of thermosetting resin shredded in part.

In the molded product of the present invention, as the shredded recycled material 2, a synthetic resin mainly composed of a thermosetting resin may be used, or all of them may be a thermosetting resin. Alternatively, if necessary, the shredded recycled material 2 may include a small piece of thermoplastic resin shredded.

In addition to the shredded reclaimed material 2, auxiliary materials such as a desiccant and an oxygen absorbent are mixed in the layer of the molded body 1 if necessary, and the desiccant includes calcium chloride and silica gel. A known hygroscopic agent can be used, and as the oxygen absorbent, ascorbic acid, iron powder or the like can be used.

In the layer of the molded body 1 made of the shredded recycled material 2, shredded recycled material 3 of paper quality prepared by shredding a paper article into small pieces is mixed in a dispersed state. May be.

The surface shape of the compression molded body 1 of the present invention varies depending on the molding pressure and compression conditions in the molding process and the inner surface shape of the compression molding die used, and may be either a smooth surface or an uneven surface. .

Further, the molded body 1 may be constituted by a two-dimensional single surface as shown in FIG. 1A, or a three-dimensional curved surface such as two or more surfaces, or a curved surface. 1 may be configured by a shape including
As shown in (b) to (c), it may be molded into a container shape.

Examples of the compression-molded article of the present invention include various sheet products such as daily necessities, stationery, construction materials, and ornaments, base sheets or plates used for them, shafts, and meals. A spoon of
It includes molded articles used as a spoon for subdivision, a storage container for various products, and the like.

[Second Invention] Next, the method for producing a compression-molded article of the second invention of the present invention will be described in detail below according to an embodiment. [Fig. 4] is a schematic side view illustrating a molding step in the method for producing a compression-molded article of the present invention.

First, in the shredded recycled material making process, as shown in FIG.
As shown in (a), for example, a large amount of unnecessary synthetic resin film-made resin article 12 (unused waste material) is shredded into small pieces by a shredder or the like. The shredded recycled material 2 in the form of

If necessary, as shown in FIG. 2B, for example, a large amount of waste paper, a paper box or other paper-made article 13 (disused waste material), a shredder, etc. Is shredded into small pieces to produce shredded recycled material 3 made of a paper material.

Next, in the forming material forming step, as shown in FIG.
As shown in FIG. 2, the shredded recycled material 2 made of the resin, or the shredded recycled material 2 and the shredded material 3 of paper quality (for example, about 30 to 70% by weight) and the thermoplastic resin powder 4 (for example, 30 to 70% by weight).
%) And a small amount of auxiliary material 5 (for example, 0.3 to 10% by weight) such as a desiccant or an oxygen absorber, if necessary, to prepare a molding material 7. In addition, an appropriate amount (for example, 3 to 10% by weight) of the paper powder 6 (paper-like fibrous powder) is simultaneously mixed into the molding material 7 if necessary.

An example of the thermoplastic resin used as the thermoplastic resin powder 4 is shown below. Thermoplastic resin powder: Main resin 1 to 3 below, added resin 1 depending on the surface condition, shape, specific gravity, etc. of the target molded product
Any one of to 3 is blended and used according to the compounding ratio. Main resin 1 ... L-LDPE (linear low-density polyethylene) Main resin 2 ... V-LDPE (extreme low-density polyethylene) Main resin 3 ... LDPE (low-density polyethylene) Added resin 1 ... EVA (ethylene vinyl acetate) added resin 2 ... EPR (ethylene propylene rubber) added resin 3 ... EPDM (ethylene propylene domain matrix)

The material used as the auxiliary material 5 will be shown below as an example. Auxiliary material; drying agent; silica gel oxygen absorber; ascorbic acid or iron powder

Next, the formed molding material 7 is subjected to a cold compression compression molding die 20 (uniaxial (unidirectional) compression as shown in FIG. Method, or a concave mold 22 of a female mold 21 (lower mold) of a press molding mold) by an isotropic compression method from above and around and below.

Subsequently, as shown in FIG. 2 (e), the mold 2
An appropriate temperature (for example, 35 to 9) for cold pressure compression molding of the thermoplastic resin powder 4 used in the molding material 7 with a heater (infrared ray) or heated temperature-controlled water
While the auxiliary heating is performed at 5 ° C.), the convex mold 24 of the male mold 23 (upper mold) is moved to a predetermined compression pressure (for example, about 5 to ²⁰ kgf / mm ² ) in the mold 22 of the female mold 21. Predetermined pressurizing speed (for example, 80 to 100 tons / sec, or 100
~ 300 ton / sec) for a predetermined time (eg 0.5
Molding material 7 that is generated by compression when pressed.
The compression molding body 1 is molded by compression molding the molding material 7 into the shape of a molded body while fusing the molding material 7 using the frictional heat of each other and the heat of plastic deformation. It should be noted that the inside of the mold 20 is preliminarily heated to room temperature (room temperature) or higher (for example, 30 to 9) before pressure compression molding.
It is suitable to preheat to about 5 ° C.

Then, as shown in FIG. 2 (f), the mold 2
The compression molded body 1 molded in 0 is taken out of the mold 20 after completion of fusion bonding due to frictional heat generated by compression, and burrs protruding from the peripheral flange portion of the molded body 1 or the like. The manufacturing is completed by cutting and removing 8 and the like.

The compression-molded body 1 produced by the above-described method for producing a compression-molded body according to the present invention has a small bulk specific gravity and is made lightweight, or the inside of the molded body 1 is a breathable molded body. Shows that the inside of the layer was kept porous by adjusting the shred size of the molding material 7, the addition amount of the mixed synthetic resin, auxiliary material, paper powder, etc., or the generation temperature under the pressure compression molding conditions. It should be compression molded in the state.

For that purpose, the molding conditions in the compression molding step of the molding are that the molding materials 7 of the shredded reclaimed materials 2 and 3 which are separated from each other in the mold 20 are mutually generated by the generated heat. Control so that the shape of the compact 1 is firmly held and compression-molded by the physical frictional force between the materials that have been compressed and brought into close contact with each other in a chemically separated state without being melt-bonded. Then, compression molding is performed.

The temperature in the mold 20 (the temperature of the molding material 7 in the mold) in the compression molding step of the molded body is about the softening temperature (glass transition point) of the thermoplastic resin powder 4 used. It is suitable, and although the thermoplastic resin powder 4 in the molding material 7 is softened, a temperature at which it does not completely melt or does not melt at all is suitable.

[0039]

EFFECTS OF THE INVENTION A compression molded product using the shredded recycled material of the present invention and a method for manufacturing the same are provided as a molding material for a molded product, and a regenerated material in the form of fine flakes such as flaky paper or synthetic resin film. ,
Preliminary preheating heat operation corresponding to the surface condition, shape, bulk specific gravity, strength, etc. of the molded product by loading it into a molding die for pressure compression molding by appropriately mixing and using the thermoplastic resin powder By performing pressure compression molding while performing predetermined cold pressure compression operation and auxiliary heating operation, the content of shredded recycled material in the molding material and Good molding process can be realized without being affected by the change in viscosity of the molten resin due to
It is possible to easily manufacture a porous compression-molded product suitable for incineration and disposal, and to manufacture a compression-molded product using a recycled material at low cost.

[Brief description of drawings]

FIG. 1A is a side sectional view of a sheet-shaped compression molded body showing an example of the compression molded body of the first invention of the present invention, and FIG. 1B is a side sectional view of a spoon-shaped compression molded body showing another example. Drawing (c) is a perspective view of the container-like compression molding which shows other examples.

2 (a) to 2 (f) are schematic side views illustrating a molding step in the method for manufacturing a compression molded article of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Compression molded body 2 ... Shredded recycled material by resin material 3 ... Shredded recycled material by paper material 4 ... Thermoplastic resin powder 5 ... Auxiliary material 6 ... Paper powder 7 ... Molding material 8 ... Burr 12 ... Resin-made articles such as synthetic resin films 13 ... Paper-made articles such as waste paper 20 ... Compression molding mold 21 ... Female mold (lower mold) 22 ... Recessed mold 23 ... Male mold (upper mold) 24 ... Convex mold

Claims (5)

[Claims] 1. A predetermined molded body is formed by using a molding material obtained by mixing shredded recycled material of paper and / or resin shredded into small pieces and new resin powder. A compression molded product using a shredded recycled material, which is compression molded. 2. A compression molded product using a shredded reclaimed material according to claim 1, wherein an appropriate amount of an auxiliary material such as a desiccant or an oxygen absorbent is mixed in the molding material. 3. A compression molded body using the shredded recycled material according to claim 1 or 2, wherein an appropriate amount of paper powder is mixed in the molding material. 4. A molding material is prepared by mixing a shredded recycled material prepared by shredding an existing material made of paper and / or resin into small pieces and nascent thermoplastic resin powder. And a molding material compression molding step of compressing and molding the molding material into a molded body using a press die, and manufacturing a compression molded body using a shredded recycled material. Method. 5. A molding material prepared by mixing the shredded recycled material and a newly formed thermoplastic resin powder in the molding material preparing step, and an auxiliary material such as an appropriate amount of a desiccant or an oxygen absorbent, or And a method for producing a compression-molded article using the shredded recycled material according to claim 4, wherein an appropriate amount of paper powder is blended.