JP2000043037A - Method for regenerating and reusing used paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To regenerate and reuse used paper such as newspapers or magazines by melting and kneading a mixture of pulverized used paper obtained by grinding the used paper in the form of powder and a resin raw material, and extruding the mixture and further pelletizing it by an extruder. SOLUTION: Either of newspapers or magazines, or handbills or all kinds of used paper are fed into a hopper 6 provided in the cylinder 3 of an extruder 10, together with pulverized paper 21 obtained by grinding it previously using a grinder and a resin raw material 22. In addition, these materials are heated, melted and kneaded by a pair of screws 5 and a resin heater 9 in the cylinder 3 and at the same time, are sequentially transferred to a molding die 7 from the hopper 6 side. Further the mixture is extruded to the outside from the outlet of the molding die 7. In this case, the mixture is extruded in the form of a strand from the outlet which is of a holelike shape, and the extruded mixture is cut using the cutter of a granulator 25 to be set in the water. After that, the set granules are sent to another place to be dried and pelletized 26. Thus regenerate and reuse of used paper such as newspapers, magazines or handbills are made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recycling used paper, and more particularly to a new method for mixing used paper such as newspaper or magazine with a resin material and reusing the same using an extruder, an injection molding machine or a sheet molding machine. About improvement.

[0002]

2. Description of the Related Art As this kind of used paper recycling method conventionally used, for example, the methods disclosed in JP-A-7-80909 and JP-A-9-201835 can be mentioned. That is, in the method for recycling a milk paper pack and a film laminated paper disclosed in Japanese Patent Application Laid-Open No. 7-80909, a used milk paper pack is powdered, mixed with a thermoplastic synthetic resin, and extruded by an extruder. It is formed into a sheet. Also, Japanese Patent Application Laid-Open No. 9-20183
In the compression-molded body using the shredded material disclosed in Japanese Patent No. 5 and the method for producing the same, a small piece of paper and a thermoplastic resin are charged into a molding die for compression molding, and then cooled. A compact is manufactured by compression molding by a hot pressing method.

[0003]

Since the conventional used paper recycling method is configured as described above, there are the following problems. That is, the former Japanese Patent Laid-Open No. 7-809
In the method for recycling a milk paper pack and a film laminated paper disclosed in Japanese Patent Publication No. 09-09, the polyethylene film and the paper of the milk paper pack are pulverized as they are without separation, and then mixed with a thermoplastic synthetic resin. Although it was agitated, newspapers and magazines are overwhelmingly large as waste paper, and these methods have not solved the reproduction of newspapers and magazines. Further, the latter Japanese Patent Application Laid-Open No.
In the compression-molded body using the shredded recycled material disclosed in Japanese Patent Publication No. 5 and the method for producing the same, waste paper is shredded into small pieces, and a powder of a thermoplastic synthetic resin is mixed therewith to obtain a molding material. At the same time, since the compression molding was obtained by cold-pressing the molding material, the resin and the small piece of old paper were poorly blended, the moldability was poor, and the surface of the molding could not be smooth. Was. Therefore, the use of the molded article has been limited.

The present invention has been made in order to solve the above-mentioned problems, and in particular, waste paper such as newspaper or magazine is mixed with a resin raw material, and the mixture is extruded using a extruder, a sheet molding machine, and an injection molding machine. It is an object of the present invention to provide a method of recycling used paper that is to be recycled.

[0005]

According to the present invention, there is provided a method of recycling used paper, wherein a resin material is added to powdered waste paper obtained by pulverizing used paper, and the powdered waste paper and the resin material are melt-kneaded by an extruder. In addition, a resin material is added to powdered waste paper obtained by pulverizing waste paper, and the powdered waste paper and the resin material are melt-kneaded by an extruder and extruded to form a panel. Or, the powdered waste paper and the resin raw material have a ratio of 5: 5, and the powdered waste paper and the resin raw material have a ratio of 6: 4. The powdery waste paper and the resin raw material are in a ratio of 7: 3, and the waste paper is a method consisting of any or all of newspaper, magazine, and leaflet advertisement paper. Injection molding of the pellet according to claim 1 It was melted and kneaded by, injection molding is a method for forming a member having a predetermined shape.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a used paper recycling method according to the present invention will be described below with reference to the drawings.
First, FIG. 1 shows a method using an extruder according to the used paper recycling method according to the present invention. A cylinder 3 connected to a speed reducer 2 is mounted on a base 1, The motor 4 is connected to the input side of the speed reducer 2.
Is connected to a screw 5 located in the cylinder 3.

A hopper 6 is connected to the rear end of the cylinder 3, and a molding die 7 is provided at the front end of the cylinder 3 via a screen 8. 9 are attached.

Next, the operation will be described. First, in a hopper 6 provided in the cylinder 3 of the extruder 10 of FIG. 1, a waste paper 20 made of any or all of newsprint, magazines, leaflet advertising paper, etc. is previously ground by a crusher (not shown). Waste paper 21 and resin raw material 22 in a mixing ratio (weight ratio) of 5:
5 or 6: 4 or 7: 3 (as a result of various experiments, 5: 5-
Molding was possible at a ratio of 7: 3, but 6: 4 was optimal. ), The powdery waste paper 21 and the resin raw material 22 are heated and melted and kneaded by the pair of screws 5 and the resin heating heater 9 in the cylinder 3 while the powdery waste paper 21 and the resin raw material 22 are supplied from the hopper 6 side. It is sequentially transferred to the molding die 7 and extruded from the outlet 7a of the molding die 7 to the outside. FIG. 1 shows an example in which the powdery waste paper 21 and the resin raw material 22 are mixed in advance and supplied from a hopper of an extruder. However, a method in which only waste paper is supplied from the middle of a cylinder by a side feed method is also possible. is there. Further, a part of the resin raw material 22 and a part of the powdery waste paper 21 are supplied from the hopper of the extruder by a single supply device, and the remaining powdery waste paper 21 of 5: 5, 6: 4, 7: 3 is side-fed. A method of supplying the liquid from the middle of the cylinder is also very effective for improving the production amount.

The outlet 7a of the molding die 7 can be made into a sheet shape or a panel shape by making an arbitrary shape. Further, by forming the outlet 7a of the molding die 7 in a hole shape, it is extruded in a strand shape and is connected to the molding die 7 of FIG.
The pellets are cut by a cutter 5 (not shown), solidified in the water of the tank of the granulator 25, sent to another place, and dried to be processed into pellets 26.

Examples The applicant used the extruder 10 as the above-mentioned extruder 10, a TX65αII-42AW-4V type manufactured by the present applicant, screw diameter: 69 mm, L / D: 42, heating: aluminum heater, cooling : Water, vent: 3 places, side feeder: 1 place, main motor: 300KW, screw rotation speed: 60-6
00 rpm. As shown in FIG. 4, the resin raw materials for Case 1, Case 2, and Case 3 were Cases 1 to 3, respectively.
An experiment was performed with the contents shown in the following Table 1 each time, and as a result, extremely good results were obtained.

[0011]

[Table 1]

The pellets 26 obtained by the extruder 10 can be injection-molded by an injection molding machine 30 shown in FIGS. First, before describing the injection molding operation, the structure of an example of a well-known injection molding machine 60 will be described. 2 and 3 show a mold clamping device of an injection molding machine to which the present invention is applied. FIG. 2 is a front view, and FIG. 3 is a side view including a partial cross section of FIG. In FIGS. 2 and 3, a reference numeral 100 denotes a fixed plate provided on the frame 112, and a plurality of tie bars 113 which are integrally implanted on the fixed plate 100 and provided vertically. Is provided with a piston 114 integrally therewith.

Each of the tie bars 113 has a movable mold 11.
5 is provided so as to be vertically movable via its bearing 116a.
Each of the pistons 114 is operably provided in a mold-clamping cylinder 117 provided vertically to 16b.
The movable plate 116 can be moved up and down by controlling the hydraulic pressure applied to the mold clamping cylinder 117.

A plurality of piston rods 118 are fixedly implanted at positions on the upper surface 116b of the movable platen 116 inside the mold clamping cylinders 117. Each of the piston rods 118 is provided with an injection nozzle 119 and a hopper 153. An injection device 212 including an injection cylinder 110 and an injection motor 111 is provided so as to be vertically movable. A plurality of cylinder portions 213 corresponding to the piston rods 118 are provided on the injection device 212. The piston 118a is connected to each of the cylinder portions 213.
Located within.

On the fixed board 100, the movable mold 1 is provided.
15 is provided with a fixed mold 215 that can be opened and closed with the mold.
17 and hydraulic unit 2 for sending hydraulic pressure to cylinder unit 213
16 and a control unit 150 for controlling the entire apparatus.

The upper part 117a of each of the mold clamping cylinders 117
The movable plate 116 is connected to the movable plate 116 by a movable plate frame 130 having an L-shaped overall shape. A plurality of linear guide bearings 131 provided on the back of the movable plate frame 130 are integrated with the frame 112. Are slidably provided on a rail 132 of an upper extension 112A provided vertically. Therefore, the above-described linear guide bearings 131 and the rails 132 constitute a sliding connection portion 140 for slidably connecting the movable platen frame portion 130 and the upper extension portion 112A, and
The rigidity of each mold clamping cylinder 117 is reinforced by the movable platen frame portion 130 so as not to be inclined.

The upper extension portions 112A have a L-shaped cross section and have a high rigidity, and are provided on a back portion of the frame 112 so as to be spaced apart from each other.
The upper portion between them is connected by a connection plate 141, and each upper extension 1
The overall shape is formed in a U-shape in plan view by the 12A and the connection plate 141, thereby further increasing the rigidity. An opening 142 is formed below the connection plate 141 so as to open corresponding to each of the molds 115 and 215. On the front side corresponding to the opening 142, the frame 112 is provided.
A safety door 151 is provided to be freely opened and closed.

Next, the operation will be described. First, the above-described pellet 2 is placed in the injection cylinder 110 from the hopper 153.
6 is melted and kneaded to form a molding material, and hydraulic pressure is supplied into each mold clamping cylinder 117 to thereby move the movable platen 116.
At the same time, the movable mold 115 is lowered to be in the mold closed and mold clamped state with the fixed mold 215.
The injection cylinder 110 is lowered by the operation of and the injection nozzle 119 is brought into a mold touch state with the movable mold 115.

In the above-described state, the molding material from the injection cylinder 110 is supplied to the cavities 115a of the molds 115 and 215.
A molded product 11b made of a member having a predetermined shape is obtained by injecting the molded product 115b into the movable mold 115 together with the movable platen 116 as shown in FIG.
Can be taken out by operating an ejector 143 provided on the fixed platen 100. In the above-described case, the vertical configuration has been described, but it is needless to say that a well-known horizontal injection molding machine can also be used.

[0020]

The used paper recycling method according to the present invention is configured as described above, so that the following effects can be obtained. That is, waste paper such as newspapers, magazines, leaflets, etc. is mixed with resin raw materials in powder form and extruded, so that waste paper with a large inventory can be formed into sheets or panels and used for packing etc. can do. In addition, the strands formed by the extrusion can be processed into pellets, and the pellets can be used to obtain molded articles by injection molding, and are used for disposable tableware, hollow parts of automobiles and the like. It can be widely applied to fillers and the like. In addition, the surface can be finished smoothly by injection molding, and a molded product that can be used in a wide range of fields at low cost can be molded.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an extruder used in a method for recycling used paper according to the present invention.

FIG. 2 is a front view showing an injection molding machine used in the used paper recycling method according to the present invention.

FIG. 3 is a side sectional view of FIG. 2;

FIG. 4 is a configuration diagram showing an embodiment in the present invention.

[Explanation of symbols]

 Reference Signs List 10 extruder 21 powdered waste paper 22 resin raw material 26 pellet

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // B29K 311: 12 (72) Inventor Noriyo 1-6-1, Funakoshiminami, Aki-ku, Hiroshima-shi, Hiroshima No. F-term (reference) in Japan Steel Works, Ltd. AC04 AD05 AD06 AG01 AR15 KA01 KA17 KF01 KF02 KM13 KW45 4J002 AA01X AB01W BB12X

Claims (7)

[Claims] 1. A powdery waste paper (21) obtained by crushing waste paper into powder.
To the powdered waste paper (21) and the resin raw material (2).
2. A method for recycling used paper, wherein 2) is extruded by melt-kneading with an extruder (10) and then extruded into pellets (26). 2. A powdery waste paper (21) obtained by pulverizing waste paper into powder.
To the powdered waste paper (21) and the resin raw material (2).
2. A method for recycling used paper, wherein 2) is extruded by melt-kneading with an extruder (10) to obtain a panel or sheet shape. 3. The powdery waste paper (21) and the resin raw material (22)
The recycled paper recycling method according to claim 1 or 2, wherein the ratio is 5: 5. 4. The powdery waste paper (21) and the resin raw material (22)
3. The method for recycling used paper according to claim 1, wherein the ratio is 6: 4. 5. The powdery waste paper (21) and the resin raw material (22)
The recycled paper recycling method according to claim 1 or 2, wherein the ratio is 7: 3. 6. The method of recycling used paper according to claim 1, wherein the used paper is any or all of newspaper, magazine, and leaflet advertising paper. 7. A method of recycling used paper, wherein the pellet (26) according to claim 1 is melt-kneaded by an injection molding machine (60), followed by injection molding to form a member having a predetermined shape.