JP4833656B2 - Packaging material recovery method and packaging material recovery device - Google Patents

Description

  The present invention relates to a packaging material recovery method and a packaging material recovery apparatus.

  2. Description of the Related Art Conventionally, a packaging container for storing fluid food such as juice and milk, for example, liquid food, for example, a web-like packaging material is sealed in a longitudinal direction to form a tubular packaging material. It is formed by sealing the material laterally at a predetermined distance, cutting it 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 a foil made of aluminum, that is, an aluminum foil.

By the way, recycled paper can be produced using the packaging container after the liquid food is poured out, and for that purpose, a packaging material recovery device is provided, and in the packaging material recovery device, The paper base material and the resin constituting the innermost layer and the outermost layer are separated, and the paper material constituting the paper base material, that is, paper fiber (fiber), is recovered as a packaging material. Then, in the recycled paper manufacturing apparatus, pulp is manufactured based on the paper fiber, and recycled paper is manufactured by making paper (see, for example, Patent Document 1).
JP-A-8-3897

  However, in the conventional packaging material recovery apparatus, paper fibers are collected for producing recycled paper, but other packaging materials are discarded without being collected. End up.

  For example, in the case of a metallic glossy packaging container, a metal vapor deposition film formed by vapor-depositing a metal on a resin film is used as a packaging material in addition to the paper fiber. In the packaging material recovery apparatus, the vapor deposition layer is deposited on the film or as a laminate with other resin layers, adhesive layers, etc., and is not recovered, but is incinerated and discarded by incineration, etc. End up.

  An object of the present invention is to provide a packaging material recovery method and a packaging material recovery device that can sufficiently recover the packaging material by solving the problems of the conventional packaging material recovery device.

  Therefore, in the packaging material recovery method of the present invention, a cutting step of cutting a packaging material composed of at least a paper base material and a metal vapor-deposited film to create a cutting material, and dipping the cutting material in a separation medium Stirring (stirring) the cutting material mixed solution, and based on the cutting material, creating a stirring mixed solution composed of a paper base material and a solid separation material; and the paper base material and solid in the stirring mixed solution A first separation step of separating the separation material, the solid separation material is immersed in the separation medium, and an oscillation frequency of at least 27 [kHz] and less than 40 [kHz], and 40 [kHz] By generating a plurality of types of ultrasonic waves with an oscillation frequency of 120 [kHz] or less and irradiating the solid separation material, the resin portion and the metal portion of the metal vapor-deposited film can be obtained. Comprising a vibration process to create a resin-metal mixture, and a second separation step of separating the resin portion and a metal portion in the resin-metal mixture.

  According to the present invention, in the packaging material recovery method, a cutting step of cutting a packaging material made of at least a paper base material and a metal vapor-deposited film to create a cutting material, and the cutting material is immersed in a separation medium Stirring the cutting material mixture, and based on the cutting material, creating a stirring mixed liquid composed of a paper base material and a solid separation material; and the paper base material and the solid separation material in the stirring mixed liquid A first separation step of separating the solid separation material in the separation medium, at least at an oscillation frequency of 27 [kHz] or more and less than 40 [kHz], and 40 [kHz] or more, In addition, by generating a plurality of types of ultrasonic waves at an oscillation frequency of 120 [kHz] or less and irradiating the solid separation material, a resin / metal comprising a resin portion and a metal portion of a metal vapor-deposited film Having a vibration step of creating a slip solution and a second separation step of separating the resin portion and a metal portion in the resin-metal mixture.

  In this case, the paper base material and the solid separation material in the stirring mixed liquid are separated, and the solid separation material is irradiated with ultrasonic waves, so that the resin portion and the metal portion in the resin / metal mixed liquid can be separated. . Therefore, the packaging material can be sufficiently collected.

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

  FIG. 1 is a diagram showing a post-processing section of a packaging material recovery apparatus in the first embodiment of the present invention, FIG. 2 is a diagram showing a pre-processing section of the packaging material recovery apparatus in the first embodiment of the present invention, FIG. 3 is a cross-sectional view of the packaging material in the first embodiment of the present invention, and FIG. 4 is a process diagram showing the packaging material recovery method in the first embodiment of the present invention.

  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 e <b> 1, a gas barrier layer e <b> 2, a paper base material e <b> 3, and an adhesive layer in order from the inner side in the state where the packaging container 10 is formed. e4, a vapor deposition layer e5, and an outermost layer e6. The innermost layer e1, the gas barrier layer e2, and the paper base material e3 constitute a base layer e8, and the vapor deposition layer e5 and the outermost layer e6 constitute a metal vapor deposition film e9. The metal vapor-deposited film e9 is formed by vapor-depositing a metal on a resin layer constituting the outermost layer e6, and is laminated on the base layer e8 via the adhesive layer e4. In the present embodiment, the packaging material 11 includes at least a paper base material e3 and a metal vapor deposition film e9.

  As the innermost layer e1 and the outermost layer e6, a thermoplastic resin, a thermosetting resin, or the like can be used, and a thermoplastic resin such as polyolefin, polyamide, or polyester is preferably used. As the thermoplastic resin, it is preferable to use polyolefin such as polyethylene, polypropylene, ethylene-propylene copolymer, polybutene-1. The polyolefin is particularly preferably polyethylene, and examples of the polyethylene include high-density polyethylene, medium-density polyethylene, low-density polyethylene, and linear low-density polyethylene (hereinafter referred to as “mLLDPE”). Density polyethylene and mLLDPE are preferred.

  And as a metal which comprises the vapor deposition layer e5, aluminum, titanium, etc. can be used, and aluminum is used in this Embodiment. As a method for depositing metal, vacuum deposition is particularly preferable. For example, high-purity aluminum is heated to a temperature of 1,300 to 1,450 [° C.] by high-frequency induction heating, direct current heating, electron beam heating, or the like. It is carried out by evaporating and evaporating and placing it under a vacuum of about 10 to 100 [mPa].

  Further, as the adhesive layer e4, a cured product of acrylate or methacrylate is used. As acrylates and methacrylates, esters of acrylic acid or methacrylic acid with monoalcohols and / or polyols can be used.

  In the present embodiment, the gas barrier layer e2 is arranged. However, the innermost layer e1 can be laminated on the paper base material e3 without the gas barrier layer e2. The gas barrier layer e2 is formed by coating an aluminum foil or the like on the inner surface of the paper base material e3. The gas barrier layer e2 can be formed using a predetermined resin, for example, ethylene vinyl alcohol copolymer, polyvinylidene chloride, polyester, nylon (trade name), or the like, instead of the aluminum foil.

  Both the gas barrier layer e2 and the vapor deposition layer e5 have a high barrier property against vapor, gas, etc., a high aroma retaining property and a light shielding property, and a high decorative effect.

  Note that printing can be performed with ink or the like on the surface of a predetermined layer of the paper base material e3, the vapor deposition layer e5, and the outermost layer e6.

  By the way, recycled paper can be manufactured using the packaging container 10 after the liquid food is poured out, and a packaging material recovery device is provided for that purpose. The packaging material recovery apparatus includes a pre-processing unit and a post-processing unit. In the pre-processing unit, the paper base material e3 is separated from the laminate composed of the innermost layer e1 and the gas barrier layer e2, and the paper base material e3. The laminate composed of the adhesive layer e4 and the metal vapor deposited film e9 is separated, and the paper fibers constituting the paper base material e3 are collected as a packaging material. And in the recycled paper manufacturing apparatus which is not illustrated, a pulp is manufactured based on the said paper fiber, and recycled paper is manufactured by performing papermaking.

  In the post-processing section, the vapor deposition layer e5 and the outermost layer e6 constituting the metal vapor deposition film e9 are separated, and aluminum constituting the vapor deposition layer e5 is recovered as a packaging material. Further, the innermost layer e1 and the gas barrier layer e2 are separated, and aluminum constituting the gas barrier layer e2 is recovered as a packaging material.

  The pretreatment unit includes a cutter hopper 16, a cutter 17, a pressure adjusting device 24, a stirrer 28, a first separator 32, and the like. First, in the cutting process, the packaging material 11 is put in the cutting machine hopper 16 in a flat state or in the state of the packaging container 10 and supplied to the cutting machine 17. The cutting machine 17 cuts the packaging material 11 into pieces of, for example, 5 to 10 centimeters square, and creates a cutting material m having a thread shape or a tape shape.

  Next, in the pressure reducing step of the pressure adjusting step, the cutting material m is placed in the pressure adjusting container 18 together with water w as a separation medium and as a liquid medium, immersed in the water w, and the water w A cutting material mixed liquid 19 is prepared as a first mixed liquid of the cutting material m. Along with this, water w is infiltrated into the paper base material e3 of the cutting 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 The space 26 above the cutting material mixed solution 19 in the pressure adjusting container 18 is depressurized, the air in the space 26 is sucked, and the cutting material mixed solution 19 is placed under reduced pressure. When the decompression step is completed, the decompression processing unit increases the 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 cutting material mixture 19 is compressed and a high pressure is applied, and water w is further permeated into the paper substrate e3. Next, in the stirring step, the cutting material mixed liquid 19 is taken out from the pressure adjusting container 18 and placed in the stirrer 28, and is stirred for a predetermined time, in this embodiment, for several minutes. At this time, in the cutting material m, the laminate of the innermost layer e1 and the gas barrier layer e2 is peeled off from the paper base material e3, and the laminate of the adhesive layer e4 and the metal vapor deposition film e9 is peeled off. A stirred mixed liquid 30 is created as a high-density second mixed liquid in which the material e3 and each laminate are mixed. In this case, a solid separation material is constituted by the respective laminates, and an agitation mixed liquid preparation step is constituted by the pressure adjustment step and the agitation step.

  Next, in the first separation step, the stirred mixed solution 30 is sent to the first separator 32 and filtered by the separation screen 33. That is, the paper base material e3 and each laminated body in the stirring mixed liquid 30 are separated, and the paper fibers constituting the paper base material e3 pass through the separation screen 33 to become a liquid pulp 36 and become a storage tank. 37. Further, each laminated body remaining as the residue 38 on the separation screen 33 without passing through the separation screen 33 is sent to the post-processing unit.

  By the way, in order to separate the paper base material e3 and each laminate, in the pressure adjusting step, water w is infiltrated into the paper base material e3, between the paper base material e3 and the resin, and the paper base material e3. The adhesive strength with aluminum is reduced. Normally, when the cutting material m is immersed in the water w, the paper base material e3 absorbs the water w and the water w penetrates into the paper base material e3. The paper base material e3 contains fine air between the fibers. Therefore, the water w is prevented from penetrating into the paper base material e3 by the air. Therefore, in general, the speed at which water w penetrates the paper base material e3 is extremely low, and the capillary phenomenon at the edge of the cutting 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. Along with this, in the cutting material m in the cutting material mixed liquid 19, the air contained in the paper base material e3 is removed by vacuum. Further, as the air is removed, the paper base material e3 contracts.

  Subsequently, when the decompression step is completed, the space 26 is placed under atmospheric pressure. At this time, the paper base material e3 contracted under reduced pressure expands, and a suction force for sucking water w is generated along with the expansion. As a result, water w is rapidly infiltrated into the paper base material e3 from the edge of the cutting material m. When the water w reaches the paper fiber, the physical adhesive strength between the paper base material e3 and the resin and between the paper base material e3 and the aluminum decreases. The thinner the cutting material m, the higher the separation efficiency.

  Thus, since the cutting material m is immersed in the water w under reduced pressure, the water w can be permeated into the paper base material e3 in a short time. Therefore, the paper base material e3 and the laminated body can be separated in a short time.

  When the compression process is started, the compression pump 22 is driven, the space 26 is pressurized, and the cutting material mixture 19 is compressed, so that the paper material e3 is filled with water w in the cutting material mixture 19. Is penetrated more rapidly. As a result, the physical adhesive strength between the paper base material e3 and the resin and between the paper base material e3 and the aluminum is further reduced, and the paper base material e3 and the laminate are reliably and shorter. It can be separated by time.

  On the other hand, the post-processing unit includes a vibration generator 41, a second separator 43, and the like. The vibration generating device 41 is connected to the vibration container 45, the ultrasonic element 47 as a vibrator disposed in the vibration container 45, and the ultrasonic element 47 for driving the ultrasonic element 47. An ultrasonic driver 48 as a driving unit is provided. In the vibration step, each of the laminates is placed in a vibration container 45 together with water w and immersed in water w.

  A vibration processing means (not shown) of the control unit 25 performs vibration processing, drives the ultrasonic element 47 via the ultrasonic driver 48, generates ultrasonic waves, and irradiates the laminated body. In general, the oscillation frequency of ultrasonic waves is set to 27 [kHz] or more and 120 [kHz] or less. When the ultrasonic element 47 is driven while being immersed in the water w, two types of physical forces are generated by the ultrasonic waves. One of them is a physical force caused by cavitation, which is generated at an oscillation frequency of 27 [kHz] or more and less than 40 [kHz], and the other one accelerates molecules of water w. It is generated by an oscillation frequency of 40 [kHz] or more and 120 [kHz] or less.

  In the present embodiment, each laminated body is put in the vibration container 45, and an oscillation frequency of 27 [kHz] or more and 120 [kHz] or less is generated by the ultrasonic element 47, and the vapor deposition layer e5 and the outermost layer are generated. e6 is separated to recover the aluminum constituting the vapor deposition layer e5, and the innermost layer e1 and the gas barrier layer e2 are separated to recover the aluminum constituting the gas barrier layer e2.

  In the present embodiment, one ultrasonic element 47 is arranged in the vibration container 45, but two or more ultrasonic elements are arranged, and two or three different oscillations are arranged. An ultrasonic wave having a frequency can be generated.

  For example, the first ultrasonic element has an oscillation frequency of 28 [kHz], the second ultrasonic element has an oscillation frequency of 45 [kHz], and the third ultrasonic element has an oscillation frequency of 100 [kHz]. Sound waves can be generated. Further, by using a variable vibrator as the ultrasonic element 47 and changing the voltage applied to the variable vibrator, the oscillation frequency can be changed at regular intervals.

  When the generated ultrasonic wave is irradiated onto the water w, a standing wave corresponding to the oscillation frequency is generated in the water w, and a portion having a strong effect is generated every integral multiple of λ / 2. Note that λ is a wavelength, and can be calculated by dividing the speed of sound by the oscillation frequency.

For example, when the oscillation frequency is 67 [kHz], the wavelength λ is
λ = 1500,000 [mm / sec] ÷ 67,000 [Hz]
= 22.4 [mm]
It is. Therefore, the standing wave is
22.4 [mm] ÷ 2 ≒ 11 [mm]
Therefore, in the water w, there are theoretically places where the action becomes stronger at intervals of about 11 [mm].

  As a result, each laminated body is sufficiently agitated in the vibrating container 45, and is composed of the vapor deposition layer e5 and the outermost layer e6, and is composed of the innermost layer e1 and the gas barrier layer e2 as a third mixed solution resin / metal. A mixture is created. In this case, the innermost layer e1 and the outermost layer e6 constitute a resin portion, and the gas barrier layer e2 and the vapor deposition layer e5 constitute a metal portion.

  Next, in the second separation step, the resin / metal mixed solution is sent to the second separator 43, and the metal portion 51 made of aluminum and the resin portion 52 made of resin are separated from each other due to the difference in specific gravity. Be made. In this way, not only paper fibers but also aluminum can be sufficiently recovered.

  Next, a second embodiment of the present invention will be described.

  FIG. 5 is a cross-sectional view of the packaging material according to the second embodiment of the present invention.

  In this case, the packaging material 11 is formed as an innermost layer e1, a gas barrier layer e2, a paper base material e3, an adhesive layer e4, a resin layer e11, and an outermost layer in order from the inner side in the state in which the packaging container 10 (FIG. 2) is formed. The base layer e8 is constituted by the innermost layer e1, the gas barrier layer e2 and the paper base material e3, and the metal vapor deposition film e9 is constituted by the resin layer e11 and the vapor deposition layer e12. The metal vapor-deposited film e9 is formed by vapor-depositing a metal on the resin layer e11, and is laminated on the base layer e8 via the adhesive layer e4.

  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 figure which shows the post-processing part of the packaging material collection | recovery apparatus in the 1st Embodiment of this invention. It is a figure which shows the pre-processing part of the packaging material collection | recovery apparatus in the 1st Embodiment of this invention. It is sectional drawing of the packaging material in the 1st Embodiment of this invention. It is process drawing which shows the packaging material collection | recovery method in the 1st Embodiment of this invention. It is sectional drawing of the packaging material in the 2nd Embodiment of this invention.

Explanation of symbols

11 Packaging material 17 Cutting machine 19 Cutting material mixed solution 28 Stirrer 30 Stirred mixed solution 32, 43 First and second separators 41 Vibration generator 47 Ultrasonic element 51 Metal part 52 Resin part e1 Inner layer e2 Gas barrier layer e3 Paper base material e4 Adhesive layers e5, e12 Deposited layer e6 Outermost layer e8 Base layer e9 Metal deposited film e11 Resin layer m Cutting material w Water

Claims (3)

(A) a cutting step of cutting a packaging material made of at least a paper base material and a metal vapor-deposited film to create a cutting material;
(B) A stirring liquid mixture creating step of stirring the cutting material mixture prepared by immersing the cutting material in a separation medium and creating a stirring liquid mixture composed of a paper base material and a solid separation material based on the cutting material When,
(C) a first separation step of separating the paper base material and the solid separation material in the stirred mixed solution;
(D) The solid separation material is immersed in the separation medium, and at least an oscillation frequency of 27 [kHz] or more and less than 40 [kHz], and 40 [kHz] or more and 120 [kHz] or less. Generating a plurality of types of ultrasonic waves with an oscillation frequency of
(E) A packaging material recovery method comprising a second separation step of separating a resin portion and a metal portion in the resin / metal mixed solution.   The packaging material recovery method according to claim 1, wherein the solid separation material includes a laminate of a resin layer and a vapor deposition layer. (A) a cutting machine for cutting a packaging material made of at least a paper base material and a metal vapor-deposited film to create a cutting material;
(B) a stirrer that stirs a cutting material mixture prepared by immersing the cutting material in a separation medium, and creates a stirring mixed solution composed of a paper base material and a solid separation material based on the cutting material;
(C) a first separator for separating the paper base material and the solid separation material in the stirred mixed liquid;
(D) comprising a plurality of ultrasonic elements , immersing the solid separation material in the separation medium, and by each ultrasonic element, at least an oscillation frequency of 27 [kHz] or more and less than 40 [kHz], and A resin comprising a resin part and a metal part of a metal vapor deposition film by generating a plurality of types of ultrasonic waves at an oscillation frequency of 40 kHz or more and 120 kHz or less and irradiating the solid separation material. A vibration generator for creating a metal mixture;
(E) A packaging material recovery apparatus comprising: a second separator that separates a resin portion and a metal portion in the resin / metal mixed solution .

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