JP6305854B2 - Manufacturing method of recycled plastic materials using wallpaper - Google Patents

Description

  The present invention relates to a method for producing a recycled plastic material using as a raw material wallpaper used for the interior of a building.

  2. Description of the Related Art Conventionally, a wallpaper having a decorative surface made of a thermoplastic plastic such as vinyl chloride on the surface of a paper as a base is used as a finishing material for interior walls and floors of buildings. Patent document 1 is shown as an example of such a wallpaper.

Utility Model Registration No. 3096987

Such wallpaper should be a kind of non-combustible garbage when demolishing a building, for example. However, if only a large amount of unnecessary wallpaper can be collected and recycled, waste of resources can be achieved. It is very advantageous because it does not have to be incinerated in the environment. Also, in fact, not only such used wallpaper but also a lot of wallpaper that was ordered and manufactured by the manufacturer, the stored wallpaper changed color, or it was manufactured in a different lot It is desirable to be able to recycle it because it will appear unusable because it looks different from the previous lot and will become unusable for many reasons.
However, the wallpaper has a decorative surface made of paper and plastic that are firmly bonded to each other and cannot be easily peeled off. It is possible to recycle the plastic sorting section. However, in such a method, even if it is separated by weight or sieving, for example, finely cut paper-derived fibers still remain on the plastic separation part side, and it is not possible to completely remove only the plastic part. Can not. In addition, since paper is hygroscopic, when plastic products are molded using recycled materials with such paper fibers remaining, moisture in the paper evaporates or air in the heated fibers, etc. As a result, there is a possibility that so-called “poison”, in which bubbles are generated in the plastic product, may enter. For this reason, there has been a demand for a method for producing a recycled plastic material that does not contain “pots” even if a plastic product is molded using the recycled material in which the wallpaper-derived fibers remain.
The present invention has been made paying attention to such problems existing in the prior art. Its purpose is to provide a method for producing recycled plastic materials made from wallpaper that does not easily contain “pots” even if plastic products are molded using recycled materials with finely cut or pulverized wallpaper. It is in.

In order to solve the above-mentioned problem, in means 1, a granular material is produced by finely cutting or pulverizing a wallpaper in which a decorative surface made of thermoplastic plastic as a main raw material is formed on the surface of a paper as a base by a processing means. A first step, and a second step of separating the granular material produced in the first step into a plastic separation part mainly composed of the decorative surface by a separation means, and a part other than the plastic separation part, A third step in which the plastic fraction obtained in the second step is kneaded under heating by a kneading means to dehydrate and degas; and the plastic fraction that has been dehydrated and degassed in the third step. And a fourth step of cooling the part to obtain a recycled plastic material.

In such a configuration, the plastic material separation part is first separated by the separation means from the recycled material that is made into a granular material by the processing means, and this is kneaded under heating by the kneading means to be dehydrated and degassed. Then, after cooling, a recycled plastic material is obtained, so that even if a product is molded using the recycled plastic material as a raw material, “pops” do not enter.
Here, the “thermoplastic” is, for example, vinyl chloride, polyethylene, polypropylene, acrylic or the like, and it is not always necessary to use only one kind of thermoplastic as a material, and they may be mixed.
Here, “powder” is a result of finely cutting or pulverizing the wallpaper, so that the underlying paper is roughly divided into fibers (hereinafter referred to as remaining paper), and the decorative surface is indefinite, for example, about 1 to 5 mm. It refers to a flaky granule having a main size and a shape divided into powders having a size of about several μm to several hundred μm. The thickness of the base paper and the decorative surface varies, but generally the base paper is about several tens of μm to several hundred μm, and the decorative surface is generally about several hundred μm to several mm. However, this does not exclude wallpaper with other thicknesses.
Although the “plastic sorting section” is mainly composed of plastic powder particles derived from the cosmetic surface, it is in a state in which not only the plastic particles completely derived from the cosmetic surface but also the remaining paper is considerably mixed. “Plastic sorting section” cannot be clearly separated from other than plastic sorting section. Since mixing of the remaining paper cannot be prevented, conventionally, the residual paper has caused “vain”. When “pops” enter products, not only “pops” enter recycled plastic materials used as raw materials, but bubbles from such recycled plastic materials move to other plastic materials, for example, transparent plastics. It is also included that the bubbles are visible in the material.

In order to separate the plastic sorting section into parts other than the plastic sorting section, the sorting means is preferably sorted by specific gravity, for example. Since the plastic sorting section is heavier than the remaining paper, for example, when a horizontal vector is given, the plastic sorting section is difficult to fly farther than the remaining paper and can be sorted. For example, when a granular material is put on a rotating body such as a rotating drum, it is preferable to separate the granular material that falls with the rotation of the rotating body by specific gravity. Further, since the remaining paper is light, it may be separated from a plastic separation portion that is difficult to be sucked by suction. Moreover, you may combine these. For example, a suction unit may be disposed for the purpose of sucking the remaining paper while the rotating body is rotating.
Moreover, it is good to provide the 2nd processing means for cutting | pulverizing or grind | pulverizing a granular material further finely in a classification means. For example, this can be realized by forming the blade body on the outer periphery of the rotating body.

You may provide the process which heats and melts a plastic fraction part beforehand by a heating means in the step before kneading a plastic fraction part by heating with a kneading means. This is because the kneading in the third step can be performed quickly and efficiently. As the heating means for this purpose, for example, a sealed internal mixer (Banbury type), a pressure kneader, a screw type mixer or the like can be used.
When the plastic fractionating part is kneaded under heating by a kneading means, it is better to carry out the sealing in a non-sealed state instead of a sealed state in order to promote dehydration and deaeration. In order to improve the efficiency of dehydration and deaeration, the surrounding work environment may be kneaded in an open state without being covered in the housing. Therefore, for example, it is good to carry out by an open roll method. The open roll method is a method in which a molten material is passed between a pair of rollers rotating in opposite directions. The gap between the rollers, the number of rotations, and the rotation time are set as appropriate. In the case of the open roll method, it is preferable to disperse the remaining paper by repeatedly passing the molten plastic separating portion between the rolls and kneading. It is also possible to knead with an extruder other than the open roll method.
A thermoplastic plastic may be added to the plastic fractionated portion separated in the second step and kneaded in the third step. This is effective when the separation is not sufficient or to obtain a higher quality material. The thermoplastic plastic to be added preferably has a fine shape so that it can be easily kneaded.
The recycled plastic material that has been kneaded and dehydrated and degassed in this way can be cooled and then finely processed by a third processing means. Good for. Fine processing includes, for example, pulverization (crushing) with a pulverizer as a processing means, or pelletizing with a pelletizer as an extrusion processing means with an extruder.

  According to the present invention, it is possible to provide a recycled plastic material that is less likely to enter “poor” when a plastic product is molded using the recycled material in which the wallpaper is finely cut or crushed and remains. .

Explanatory drawing explaining the crushing process of embodiment of this invention. Explanatory drawing explaining a classification process similarly. Explanatory drawing explaining a kneading | mixing process similarly.

Hereinafter, specific embodiments of a method for producing a recycled plastic material according to the present invention will be described with reference to the drawings.
<Crushing process>
As shown in FIG. 1, a wallpaper 1 in which a decorative surface made of vinyl chloride having irregularities is formed on the surface of paper that is an unnecessary base material, which is a raw material, is put into a crusher 2 as a processing means. The charging can be performed either batchwise or continuously. The wallpaper 1 may be a lot that is unused and unnecessary, or a used one that should become waste. The same kind of wallpaper 1 is made into the same lot according to the color of the plastic. The wallpaper 1 thrown into the hopper 3 of the crusher 2 is crushed between the rotary cutting blade 4 and the fixed blade 5 and is temporarily collected as a granular material 6. The granular material 6 is composed of a remaining paper and an irregular granular or powdery object derived from the decorative surface.

<Separation process>
As shown in FIG. 2, the granular material 6 is thrown into the separator 7 as a classification means. The charging can be performed either batchwise or continuously. The separator 7 has a rotating drum 9 having a comb blade 8 as a blade body on the outer periphery, and three passages 10 to 12 are provided around the rotating drum 9 in the circumferential direction. . The inside of the separator 7 is sucked from a suction device (not shown) through the second and third passages 11 and 12 to be in a negative pressure state.
The granular material 6 put in from the hopper 13 circulates around the outer periphery together with the rotating drum 9 by the rotation of the rotating drum 9. First, the first passage 10 arranged at the most upstream has an irregular shape having a large specific gravity derived from the decorative surface. The plastic sorting section 13 mainly composed of a granular or powdery object will fall. The plastic sorting unit 13 includes the remaining paper, but most of the parts are derived from the decorative surface. In addition, the second passage 11 adjacent to the first passage 10 and downstream of the first passage 10 has a portion having a smaller specific gravity than the portion separated by the plastic separation portion 13 and a relatively large fiber. The remaining paper falls. The separation unit that falls into the second passage 11 is referred to as an intermediate separation unit 14. Since many decorative face-derived parts fall into the first passage 10 and become the plastic sorting portion 13, there are relatively few cosmetic face-derived portions that move to the second passage 11 and become the intermediate sorting portion 14. The intermediate separation unit 14 is collected and put into the separator 7 again.
Further, the remaining paper is almost sucked into the third passage 12 arranged at a relatively high position further downstream, and there are few portions derived from the decorative surface. Let the separation part sucked into the third passage 11 be a remaining paper separation part 15. The remaining paper sorting unit 15 is a sorting unit that cannot be reused as recycled plastic. Here, the plastic sorting part 13 that has fallen into the first passage 10 is collected and transferred to the third step. The plastic sorting unit 13 has a substantially granular appearance and an appearance such that the remaining paper is slightly included. Since the rotating drum 9 is provided with the comb blade 8, the granular material 6 is further subdivided simultaneously with the separation.

<Melting process>
The plastic fractionating unit 13 is melted in a batch system with an internal mixer as a heating means to obtain a paste-like fluid.
<Kneading process>
As shown in FIG. 3, the paste-like plastic fractionation part 13 taken out from the internal mixer is kneaded using an open roll device 17 as a kneading means. The open roll device 17 is composed of a pair of rolls 18 and 19 disposed horizontally at a constant distance. Both rolls 18 and 19 rotate inwardly (that is, in a direction of pulling downward). A heater (not shown) is built in one roll 18 to heat the roll 18. When the paste-like plastic separation unit 13 is inserted between the rolls 18 and 19 of the open roll device 17, it is sandwiched between the rolls 18 and 19 and kneaded (kneaded) while being heated. Since the paste-like plastic separation part 13 is wound around the roll 18 on the heated side, the operator can add a new paste-like plastic separation part 13 as appropriate, or partially cut and roll the cut part again. The kneading operation is repeatedly performed while increasing the density when passing between the rolls 18 and 19 by, for example, charging between the rolls 18 and 19. Then, when it is determined that sufficient heating and kneading have been performed, cutting is performed as appropriate. The cutting is performed by bringing a knife-like jig into contact with the rotating roll 18 and separating the required amount of paste-like plastic separating portion 13 from the roll 18. Even if the plastic fractionation part 13 wound around all the rolls 18 is cut out, a new paste-like plastic fractionation part 13 may be put together while being cut out from a part that is partially kneaded.
<Cooling and pellet processing steps>
An appropriately cut paste-like plastic separation unit 13 is allowed to cool and is then charged into the same crusher 2 shown in FIG. 1 to obtain a pellet product having a size of several millimeters to several centimeters.

  With this configuration, in the above embodiment, even if the plastic separation unit 13 remains without being able to sufficiently separate the remaining paper in the separation process, repeated kneading work is performed in an open environment while heating in the kneading process. By doing so, moisture and air in the remaining paper are released, and the remaining paper is also uniformly dispersed in the plastic portion, and a good material can be obtained as a recycled plastic material to be used by heating.

It should be noted that the present invention can be modified and embodied as follows.
The above-described configurations of the crusher 2, the separator 7, the internal mixer 16, the open roll device 17 and the like are examples, and may be realized by other configurations.
-The target wallpaper 1 may be one using a plastic other than the above.
In the above embodiment, the plastic kneading part 13 is melted in the melting step and then the kneading step is performed. However, the kneading may be performed in combination with the melting by heating in the kneading step. For example, it is possible if the kneading step is performed by putting the plastic sorting unit 13 in the housing instead of the open roll device 17.
In the above description, the pasty plastic separation unit 13 is repeatedly kneaded between the rolls 18 and 19 using one open roll device 17, but a plurality of open roll devices 17 are arranged in series. And kneading may be performed.
In the sorting step, the plastic sorting unit 13 may be obtained by means other than the separator 7 for sorting by the specific gravity as described above. Moreover, you may use the separator of a structure other than the above also when fractionating by specific gravity. Further, the rotating drum 9 of the separator 7 does not have to include the comb blade 8.
-In a kneading | mixing process, you may make it increase the content of a plastic by adding another plastic to the plastic fractionation part 13 (a fine pellet shape is preferable).
-In addition, it is free to change and implement in a manner not departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Wallpaper, 2 ... Crusher as a processing means, 6 ... Powder granule, 7 ... Separator as a sorting means, 13 ... Plastic fractionation part, 17 ... Open roll apparatus as a kneading means.

Claims (7)

A first step of producing a granular material by finely cutting or pulverizing a wallpaper in which a decorative surface made of thermoplastic plastic as a main raw material is formed on the surface of a paper as a base;
A second step of separating the powder and granule produced in the first step into a plastic separation part mainly composed of the decorative surface by a separation means and a part other than the plastic separation part;
A third step of kneading the plastic fraction obtained in the second step with heating by a kneading means to dehydrate and deaerate;
And a fourth step of cooling the plastic separating portion dehydrated and degassed in the third step to obtain a recycled plastic material, and a method for producing a recycled plastic material using wallpaper as a raw material.   The method for producing a recycled plastic material using wallpaper as a raw material according to claim 1, wherein the sorting means separates the plastic sorting portion and other portions by specific gravity.   The wallpaper according to claim 1 or 2, wherein the sorting means includes a second processing means for further finely cutting or pulverizing the granular material produced in the first step. A method for manufacturing recycled plastic materials.   The said kneading means is implement | achieved by allowing the said plastic fractionation part fuse | melted between a pair of mutually opposing rollers rotated in the opposite direction to pass through several times, pressurizing. A method for producing a recycled plastic material using the wall paper as described above.   The recycled plastic material as a raw material according to any one of claims 1 to 4, wherein the plastic fractionating part is heated and melted in advance by a heating means before the third step. Method.   6. The recycled plastic made from wallpaper according to any one of claims 1 to 5, further comprising a sixth step of finely processing the recycled plastic material cooled in the fourth step by a third processing means. Material manufacturing method.   The wallpaper according to any one of claims 1 to 6, wherein a thermoplastic plastic is added to the plastic sorting part sorted in the second step and kneaded in the third step. Recycled plastic material manufacturing method.

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