JP2005248395A - Method for separating resin and apparatus for separating resin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To separate paper fibers from a resin in a short time. <P>SOLUTION: The method for separating the resin comprises a pulverizing step of pulverizing a packaging material 11 and preparing a pulverized material m, a decompressing step of placing a mixture liquid 19 of the pulverized material prepared by dipping the pulverized material m in a separation medium under reduced pressure for a prescribed time and then raising the pressure, a stirring step of stirring the mixture liquid 19 of the pulverized material and preparing a stirred mixture liquid 30 composed of the paper fibers and at least the resin and a separating step of separating the paper fibers from the resin in the stirred mixture liquid 30. In this case, since the mixture liquid 19 of the pulverized material prepared by dipping the pulverized material m in the separation medium is placed under the reduced pressure for the prescribed time and the pressure is then raised, the separation medium can be permeated through a paper substrate in a short time. Thereby, the paper fibers can be separated from the resin in the short time. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a resin separation method and a resin separation apparatus.

  Conventionally, a packaging container for storing liquid foods such as juice and milk has, for example, a web-like packaging material sealed in a longitudinal direction to form a tubular packaging material, and the tubular packaging material is placed at a predetermined distance. It is formed by sealing in a direction and cutting to create a pillow-shaped prototype container and molding the prototype container. The packaging material is composed of an innermost layer, a paper base material, and an outermost layer in order from the inner side in the state in which the packaging container is formed, and a gas barrier layer is provided between the innermost layer and the paper base material as necessary. The innermost layer and the outermost layer are formed by coating a paper substrate with a resin such as polyethylene resin. The gas barrier layer is formed by coating the paper base material with an aluminum foil or the like.

By the way, a recycled paper manufacturing apparatus for manufacturing recycled paper using a packaging container after liquid food is poured out is provided. In the recycled paper manufacturing apparatus, the paper fibers (fibers) constituting the paper base material coated with the paper base material and the resin constituting the innermost layer and the outermost layer are separated to produce pulp, and paper making is performed. Thus, recycled paper is manufactured (for example, see Patent Document 1).
JP-A-8-3897

  However, in the conventional recycled paper manufacturing apparatus, the paper base is infiltrated with water in order to separate the paper fibers and the resin, but the time for infiltrating the water into the paper base is long. Therefore, it takes a long time to separate the paper fiber and the resin.

  An object of the present invention is to provide a resin separation method and a resin separation apparatus that can solve the problems of the conventional recycled paper manufacturing apparatus and can separate paper fibers and resin in a short time.

  Therefore, in the resin separation method of the present invention, a pulverization step of pulverizing the packaging material to prepare a pulverized material, and a pulverized material mixture prepared by immersing (coughing) the pulverized material in a separation medium for a predetermined time. A depressurization step for raising the pressure after placing under reduced pressure, an agitation step for agitating (stirring) the pulverized material mixture to create an agitated mixture composed of paper fibers and at least a resin, and paper in the agitated mixture A separation step of separating the fiber and the resin.

  In another resin separation method of the present invention, the method further includes a compression step of compressing the pulverized material mixture when the decompression step is completed.

  In the resin separation device of the present invention, a pulverizer for pulverizing the packaging material to produce a pulverized material, and a pulverized material mixture prepared by immersing the pulverized material in a separation medium are placed under reduced pressure for a predetermined time. A pressure adjusting device that raises the pressure, a stirrer that stirs the pulverized material mixed liquid to create a stirred mixed liquid composed of paper fibers and at least a resin, and a separation that separates the paper fibers and the resin in the stirred mixed liquid With a bowl.

  According to the present invention, in the resin separation method, the pulverization step of pulverizing the packaging material to prepare a pulverized material, and the pulverized material mixture prepared by immersing the pulverized material in a separation medium are subjected to reduced pressure for a predetermined time. After the placing, the pressure reducing step for increasing the pressure, the stirring step for stirring the pulverized material mixture to create a stirring mixture composed of paper fibers and at least resin, and the paper fibers and the resin in the stirring mixture are separated. Separating step.

  In this case, since the pulverized material mixture prepared by immersing the pulverized material in the separation medium is placed under reduced pressure for a predetermined time and then the pressure is increased, the separation medium is applied to the paper substrate in a short time. Can penetrate. Therefore, the paper fiber and the resin can be separated in a short time.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a conceptual diagram showing a resin separation apparatus in an embodiment of the present invention, FIG. 2 is a sectional view of a packaging material in an embodiment of the present invention, and FIG. 3 is a process showing a resin separation method in an embodiment of the present invention. FIG.

  In the figure, reference numeral 11 denotes a packaging material constituting the packaging container 10, and the packaging material 11 is composed of an innermost layer 12, a gas barrier layer 13, a paper base material 14, and an outermost layer 15 in order from the inside in a state where the packaging container 10 is formed. Consists of. In the present embodiment, the gas barrier layer 13 is disposed. However, the innermost layer 12 can be formed on the paper base material 14 without the gas barrier layer 13 being interposed. The gas barrier layer 13 is coated with an aluminum foil or the like on the inner surface of the paper substrate 14, and the innermost layer 12 is coated with a resin such as polyethylene resin on the inner surface of the gas barrier layer 13. Is formed by coating the outer surface of the paper substrate 14 with a resin such as polyethylene resin. Instead of the aluminum foil, the gas barrier layer 13 is made of a predetermined resin such as ethylene vinyl alcohol copolymer (EVOH), polyvinylidene chloride (PVDC), polyester (PET), nylon (trade name), or the like. It can also be formed by coating the inner surface of the material 14.

  By the way, recycled paper can be manufactured using the packaging container after liquid food is poured out. In this case, the recycled paper manufacturing apparatus includes a resin separator, and in the resin separator, pulp is manufactured by separating paper fibers constituting the paper base material 14 and resins constituting the innermost layer 12 and the outermost layer 15. However, recycled paper is manufactured by making paper.

  The resin separator includes a pulverizer hopper 16, a pulverizer 17, a pressure adjusting device 24, a stirrer 28, a separator 32, and the like. First, in the pulverization step, the packaging material 11 is put into the pulverizer hopper 16 in a flat state or as it is in the packaging container 10 and supplied to the pulverizer 17. The pulverizer 17 pulverizes the packaging material 11 and cuts it to form a pulverized material m in the form of a thread or tape. The pulverized material m is composed of a paper portion which is a portion of the paper base 14 in the packaging material 11, a resin portion which is a portion of the innermost layer 12 and the outermost layer 15, and an aluminum portion which is a portion of the gas barrier layer 13. When a resin is used as the gas barrier layer 13, a resin portion is constituted by the innermost layer 12, the outermost layer 15, and the gas barrier layer 13.

  Next, in the depressurization step of the pressure adjustment step, the pulverized material m is placed in the pressure adjustment container 18 together with water w as a separation medium and as a liquid medium, immersed in the water w, and the water w And a pulverized material mixed liquid 19 as a first mixed liquid of the pulverized material m are prepared. Along with this, water w penetrates the paper base material 14 of the pulverized material m. In addition, in the zenith part 20 of the said pressure regulation container 18, the vacuum pump 21 is connected via the line L1, and the compression pump 22 is connected via the line L2. The pressure adjusting device 24 is constituted by the pressure adjusting container 18, the vacuum pump 21, the compression pump 22, and the like.

  In the present embodiment, water w is used as a separation medium. Instead of water w, alcohol or the like, or a solution such as a surfactant or an immersion accelerator is used. Can be.

  The vacuum pump 21 and the compression pump 22 are connected to the control unit 25, and when the decompression process is started, a decompression processing unit (not shown) of the control unit 25 performs a decompression process, and the vacuum pump 21 is set to about 1 Driven for ˜2 [minutes], the space 26 above the pulverized material mixed liquid 19 in the pressure adjusting container 18 is depressurized, the air in the space 26 is sucked, and the pulverized material mixed liquid 19 is placed under reduced pressure. And if the said pressure reduction process is completed, the said pressure reduction process means will raise a pressure. That is, the driving of the vacuum pump 21 is stopped and the space 26 is placed under atmospheric pressure.

  Subsequently, when the compression process of the pressure adjustment process is started, the compression processing means (not shown) of the control unit 25 performs the compression process, and the compression pump 22 is operated for a predetermined time, in this embodiment, several times. By driving for a minute and supplying compressed air to pressurize the space 26, the pulverized material mixture 19 is compressed and a high pressure is applied, and the paper base 14 is further infiltrated with water w. Next, in the stirring step, the pulverized material mixed liquid 19 is taken out from the pressure adjusting container 18 and placed in the stirrer 28 and stirred for a predetermined time, in this embodiment, for several minutes. At this time, the resin and the aluminum foil are peeled off from the paper base material 14 in the pulverized material m, and the density of the paper fiber and at least the resin, in the present embodiment, the mixed density of the paper fiber, the resin, and the aluminum foil. The stirring mixed liquid 30 as a high 2nd liquid mixture is created.

  Next, in the separation step, the stirred mixed solution 30 is sent to the separator 32 and filtered by the separation screen 33. That is, the paper fiber, the resin, and the aluminum foil in the stirred mixed liquid 30 are separated, and the paper fiber passes through the separation screen 33 and is stored in the storage tank 37 as a liquid pulp 36. Further, the resin and the aluminum foil remaining on the separation screen 33 without passing through the separation screen 33 become a solid residue 38.

  By the way, in order to separate the paper fiber from the resin and the aluminum foil, in the pressure adjusting step, water w is infiltrated into the paper base material 14, and between the paper base material 14 and the resin, and between the paper base material 14 and the aluminum. The adhesive strength between the foils is reduced. Normally, when the pulverized material m is immersed in water w, the paper base 14 absorbs the water w and the water w penetrates into the paper base 14, but the paper fiber contains fine air between the fibers. The water w is prevented from penetrating the paper base material 14 by the air. Therefore, in general, the speed at which water w penetrates into the paper substrate 14 is extremely low, and the capillary phenomenon at the edge of the pulverized material m is suppressed.

  Therefore, in the present embodiment, in the pressure adjusting step, first, a decompression process is performed, and the air in the space 26 is sucked. Accordingly, the air contained in the paper base material 14 is removed by vacuum in the pulverized material m in the pulverized material mixed liquid 19. Further, as the air is removed, the paper substrate 14 contracts.

  Subsequently, when the decompression step is completed, the space 26 is placed under atmospheric pressure. At this time, the paper base material 14 contracted under reduced pressure expands, and a suction force for sucking the water w is generated along with the expansion. As a result, the water w is rapidly infiltrated into the paper base material 14 from the edge of the pulverized material m. When the water w reaches the paper fiber, the physical adhesive strength between the paper base material 14 and the resin and between the paper base material 14 and the aluminum foil is lowered. The finer the pulverized material m, the higher the separation efficiency.

  Thus, since the pulverized material m is immersed in the water w under reduced pressure, the water w can be permeated into the paper base material 14 in a short time. Therefore, it is possible to separate the paper fiber from the resin and the aluminum foil in a short time.

  When the compression process is started, the compression pump 22 is driven, the space 26 is pressurized, and the pulverized material mixed liquid 19 is compressed. w penetrates more rapidly. As a result, the physical adhesive strength between the paper base material 14 and the resin and between the paper base material 14 and the aluminum foil is further reduced, and the paper fiber, the resin, and the aluminum foil are reliably and more It can be separated in a short time.

  In addition, this invention is not limited to the said embodiment, It can change variously based on the meaning of this invention, and does not exclude them from the scope of the present invention.

It is a conceptual diagram which shows the resin separation apparatus in embodiment of this invention. It is sectional drawing of the packaging material in embodiment of this invention. It is process drawing which shows the resin separation method in embodiment of this invention.

Explanation of symbols

11 packaging material 16 pulverizer hopper 17 pulverizer 19 pulverized material mixture 24 pressure adjusting device 28 agitator 30 agitated mixture 32 separator m pulverized material w water

Claims (3)

(A) a pulverizing step of pulverizing the packaging material to create a pulverized material;
(B) A depressurization step of increasing the pressure after placing the pulverized material mixture prepared by immersing the pulverized material in a separation medium under a reduced pressure for a predetermined time;
(C) a stirring step of stirring the pulverized material mixture to create a stirring mixture composed of paper fibers and at least a resin;
(D) A resin separation method comprising a separation step of separating the paper fiber and the resin in the stirred mixed solution.   2. The resin separation method according to claim 1, further comprising a compression step of compressing the pulverized material mixture after the decompression step. (A) a pulverizer that pulverizes the packaging material to create a pulverized material;
(B) a pressure adjusting device that raises the pressure after placing the pulverized material mixture prepared by immersing the pulverized material in a separation medium under reduced pressure for a predetermined time;
(C) an agitator that agitates the pulverized material mixture and creates an agitated mixture composed of paper fibers and at least a resin;
(D) A resin separation device comprising a separator for separating the paper fiber and the resin in the stirred mixed solution.

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