JP4920138B2 - Injection molding boots recycling method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for recycling an injection-molded boot that recycles a used injection-molded boot.
[0002]
[Prior art]
Synthetic resin injection-molded boots are primarily used as walking footwear during rainfall and snowfall, but in terms of number, many are used as business footwear at work sites that handle water, such as food factories. . Footwear used for such work is provided to all workers working in the factory. The characteristics of such footwear for business use are not of the nature of being used until it is crushed like footwear for walking, but there are problems with hygiene management and it is limited to a certain period (for example, 6 months to 1 year). It is customary to be exchanged with new footwear afterwards.
[0003]
In addition, unnecessary footwear that has been used has been conventionally disposed of as landfill or incinerated. General synthetic resins cannot be biodegradable as is well known. For this reason, even if it is disposed of in landfill, it does not rot and exists in the ground in a bulky state. Therefore, it is well known that the ground is not tightened and the use of the landfill site is a problem.
[0004]
Of course, even if it is going to landfill waste, it is difficult to secure a landfill site now, and there is a strong demand for volume reduction. Conventionally, incineration has been performed to reduce the volume of waste. However, when synthetic resin waste such as PVC is incinerated, not only hydrogen chloride is generated and pollutes the atmosphere, but hydrogen chloride This will corrode the equipment of the incineration facility. Inappropriate low-temperature incineration so as not to corrode incinerator equipment leads to the generation of environmental hormones such as dioxins, which is extremely troublesome in refuse incineration facilities.
[0005]
Under these circumstances, interest in environmental issues has recently increased, and active efforts for environmental conservation activities, including resource saving and environmental load reduction, have been pressed. Actually, the movement of recycling in each industry, such as the Containers and Packaging Recycling Law and the Home Appliance Recycling Law, has accelerated, and the momentum for the transition to a recycling-oriented society is rapidly increasing.
[0006]
[Problems to be solved by the invention]
By the way, synthetic resin injection-molded boots, especially footwear used as a work site for water handling work such as a food factory, are worn by all workers working in the factory. The same number of unnecessary boots are generated when the number of 000 pairs is provided from the manufacturer to the factory, and the workers change to new footwear.
[0007]
In view of the circumstances as described above, an object of the present invention is to provide a method for collecting used boots and recycling the collected boots as raw materials.
[0008]
[Means for Solving the Problems]
In order to achieve the above-mentioned purpose, used business boots are collected, and the collected boots are recycled into their raw materials for recycling, and include a washing process, a coarse pulverization process, a separation process, and a pellet. Processing.
Work boots for business use are the same material, regardless of size, are manufactured in a uniform color, and are injection-molded boots in which the boot boot body and the lining are integrated.
The boots body is a synthetic resin layer injection-molded using shoe materials,
The lining is a backing cloth that is integrally laminated on the inner surface of the synthetic resin layer of the boots body,
The cleaning process is a process to wash off the deposits on the injection molded boots.
The coarse pulverization process is a process of pulverizing the injection-molded boots into coarse particles,
Fractionation process, the synthetic resin together with the coarse particles of injection molding boots milled by the coarse grinding process further ground to fine, a process of separating into a fiber維屑lining,
The pelletizing process is a process of granulating the fine particles of the synthetic resin obtained by the fractionation process to regenerate the raw material pellets of the shoe material of the boots body,
The washing process is performed while pulverizing the injection-molded boots into coarse particles by a coarse pulverization process.
[0011]
Further, the cleaning process and the coarse pulverization process are performed simultaneously, and the cleaning process is performed after the coarse pulverization process.
[0012]
Moreover, the coarse grain of the injection-molded boots subjected to the coarse pulverization treatment is washed during transportation to the next step while being stirred with water or a detergent by a screw conveyor.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below. FIG. 1 shows an example of an injection-molded boot made by the recycling method according to the present invention. In FIG. 1, the point that an injection-molded boot is an injection-molded boot in which a boot main body 1 and a lining 2 are integrated is not different from a general injection-molded boot. The boots main body 1 is a synthetic resin layer including a shell and a sole that is injection-molded using a shoe material (for example, PVC), and the lining 2 is integrally laminated on the inner surface of the synthetic resin layer of the boots main body 1. It is a lining cloth.
[0014]
The boots main body 1 manufactured by the recycling method according to the present invention may contain fiber waste 3 in the synthetic resin layer as shown in FIG. The fiber waste 3 contained in the synthetic resin layer is lining waste generated by crushing the injection-molded boots.
[0015]
The reason why the fiber waste 3 of the lining 2 is contained in the synthetic resin layer of the boot body 1 of the recycled injection-molded boots is that the injection-molded boots used in the recycling method according to the present invention are used as raw materials. Most of the lining of injection-molded boots that are raw materials are separated and removed from the pulverized product of the synthetic resin layer of the boots body, but include those that are granulated into raw material pellets with the synthetic resin pulverized product without being removed. This is because this raw material pellet was used as a shoe molding material for injection-molded boots.
[0016]
An outline of a recycling system for injection-molded boots according to the method of the present invention will be described with reference to FIG. In FIG. 2, the boot maker collects used boots from the user's factory (step S1). The raw material of the recycle injection molded boots according to the present invention is a used injection molded boots. As described above, the used injection-molded boots are used after being used for a certain period of time as footwear on a work site where water is handled like a food factory.
[0017]
Such work boots for business use are manufactured in the same material and in a similar color, for example, white, even though the sizes are various. Moreover, since it is used at the same time in the same environment, there is a feature that there is almost no difference in the quality and degree of dirt. If this is a boot used for walking during general rain and snow, the color, material, and structure will vary, and if a large number of boots can be collected at the same time, select by color and material. However, even if it can be selected, it is almost impossible to reproduce it for each shoe material and color.
[0018]
In the present invention, a washing process, a pulverizing process, a sorting process, and a pelletizing process are sequentially performed, and the pellets obtained by the pelletizing process are used as a shoe material for a boot boot body. The cleaning process is a process of washing off the deposits on the injection-molded boots. The injection-molded boots collected from the user's factory are washed (step S2). The coarse pulverization process is a process of pulverizing the injection-molded boots into coarse particles. Next, the coarsely pulverized coarse particles 4 are finely pulverized as a fractionation process, and are separated into synthetic resin fine particles 4a and lining fiber waste 3 (step S3).
[0019]
The pelletization process is a process for granulating the synthetic resin fine particles 4a obtained by the fractionation process to regenerate the recycled pellets 5 as raw materials for the shoe material of the boots body. Synthetic resin fine particles 4a are granulated and processed into pellets (step S4), and new pellets are blended into the recycled pellets (regenerated PVC pellets) 5 (step S5). On the other hand, the fiber waste 3 of the lining separated from the coarse particles 4 of the synthetic resin layer is separately reused for material recycling, solid fuel or thermal recycling 3a as a fiber raw material.
[0020]
The compounded pellet compound obtained in step S5 is injected into a mold with a new lining and a new boot is formed. The molded injection boot is finished, inspected and packed (step S6). The product is mounted on a vehicle and shipped to the user's factory (step S7). At the user's factory, the new boots received are exchanged for the boots of the worker, the manufacturer loads the newly used boots into the vehicle and takes them home (step S8), returns to step S1, pulverizes the collected boots, Repeat the above steps to recycle boots.
[0021]
Below, the point of the process in the washing | cleaning process (step S2) of the collect | recovered boots, a rough crushing process (step S3), and a classification | category process (step S3) is demonstrated concretely. As described above, the collected boots are adhering to the factory where the boots are used, such as mud, chemicals, paint and oil. In order to recover the collected boots as shoe material, it must first be washed. In normal cases, the collected boots are immersed in a detergent solution or washed with water to wash mud and dirt attached to the surface. Perhaps it is difficult to remove surface deposits by simply washing the boots as they are. There are many.
[0022]
For this reason, it is effective to perform the coarse pulverization process prior to the cleaning process by changing the order of the steps and to wash the coarsely pulverized coarse particles. Furthermore, the cleaning process can be performed while performing the coarse pulverization process. Even if the steps of the washing process and the coarse pulverization process are interchanged, the washing process is still a process of washing off the deposits on the injection-molded boots. In FIG. 3, as the coarse pulverization treatment, the used injection-molded boots MB as raw materials are put into the pulverizer 6 for coarse pulverization.
[0023]
FIG. 4 shows the structure of the pulverizer 6. The pulverizer 6 has a rotary blade 62 in a hopper 61, and the raw material boots MB put in the hopper 61 receives a shearing force from the rotary blade 62 and turns it into coarse particles 4 having a size of about 1 cm. Coarsely pulverized. When crushing the raw material boots MB, the raw material boots MB are washed simultaneously with the pulverization by roughly pulverizing in the machine while spraying water or detergent from the water supply pipe 7 into the hopper 61 of the pulverizer. Fall to the next process.
[0024]
Or if the water supply pipe 64 is provided in the conveyor apparatus 63 and water is directly supplied into the conveyor apparatus 63 through this water supply pipe 64, the raw material boots MB will receive a washing | cleaning process after being coarsely pulverized. If water or detergent is sprayed from the water supply pipe 7 into the hopper 61 of the pulverizer, and water is directly supplied into the conveyor device 63 through the water supply pipe 64 of the conveyor device 63, the cleaning process and the coarse pulverization process are performed simultaneously. Further, after the coarse pulverization process, the cleaning process is performed.
[0025]
The screw conveyor 65 provided in the conveyor device 63 conveys the pulverized product to the dehydrator 9 as the next step while stirring the pulverized product, and the coarse particles 4 which are the pulverized product are water or detergent supplied into the conveyor device 63. Mud, filth, etc. adhering sufficiently to the coarse particles are removed from the coarse particles and sent to the dehydrator 9. The coarse particles 4 are dehydrated in the dehydrator 9, sucked by the wind force of the first blower 8, and transported to the first cyclone 10. In the first cyclone 10, coarse particles of the synthetic resin having a large weight fall from the first cyclone 10 to the secondary pulverizer 11 and are secondarily pulverized. FIG. 5 shows the structure of the secondary pulverizer 11. The secondary pulverizer 11 has a rotary blade 112 in the hopper 111, and the coarse particles 4 put in the hopper 111 are subjected to a secondary pulverization by receiving a shearing force from the rotary blade 112, and have a size of about 1 mm. It is pulverized into fine particles.
[0026]
At the same time, the lining is finely pulverized in the secondary pulverizer 11 to become fiber waste, and the finely pulverized synthetic resin and the fiber waste of the lining are forcibly separated by the shearing force at the time of pulverization. The air is transported to the second cyclone 13 from the secondary pulverizer 11 by being sucked into the air. In the second cyclone 13, the finely pulverized synthetic resin pulverized material falls to the hopper 14, and the lightweight lining fiber debris continues to be pneumatically transported and captured by the bag filter 15. The pulverized product and the lining fiber waste can be separated to a considerable degree.
[0027]
On the other hand, the lightweight floating substance that does not fall into the secondary pulverizer 11 and floats in the air is sucked into the third blower 16 as it is, is transported by air, and sent to the third cyclone 17. In the third cyclone 17, the fine pulverized product of the synthetic resin falls into the pits 18, and the fiber waste of the lining is captured by the bag filter 15 and separated into the finely pulverized product of the synthetic resin and the fiber waste of the lining, respectively. .
[0028]
The resulting finely pulverized synthetic resin is granulated, processed into recycled pellets, and used as a raw material for recycled injection-molded boots. This is because even if the injection-molded boots are recycled products, the same product characteristics as the original products are maintained. Although PVC can obtain a denser structure as it is kneaded, the composition of recycled pellets is slightly different from that of original pellets, and physical properties may deteriorate. For example, a plasticizer may be extracted and hardened, but new pellets are added to the regenerated pellets to compensate for such deterioration in physical properties.
[0029]
Of course, even recycled pellets obtained from collected boots cannot be used as shoe material for injection-molded boots. Normally, the recycled pellets are set to a blending ratio of 50 to 100% with respect to the new raw material pellets. However, it is important to use the recycled pellets at 50% or more of the weight of the boots to increase the material reuse rate.
[0030]
In the present invention, the recycled pellets may be mixed with fiber waste of lining that cannot be separated. As shown in FIG. 1, fiber wastes of the lining are mixed in the boots main body of the recycle injection-molded boots manufactured using such recycled pellets. However, by making the color of the boots main body of the injection-molded boots the same as the color of the lining, the color of the textile waste of the lining mixed with the boots main body can be made inconspicuous.
[0031]
The present invention mainly intends to recycle work boots used in various factories, and this type of work boots, especially work boots used in food factories, have problems in hygiene management. In general, white boots are used, and the boots are usually used for a certain period of time (for example, 6 months to 1 year) and then exchanged with new ones at the same time. Because there are no circumstances that cause extreme contamination and the quality of the dirt is the same, it is possible to wash uniformly, and by washing, coarse grinding, fractionation, and subsequent pelletization It is easy to recycle into injection-molded shoe material.
[0032]
In particular, in the present invention, the washing treatment is performed by washing the coarse particles of the injection-molded boots crushed by the coarse pulverization treatment, or by performing the washing treatment while roughly pulverizing the injection-molded boots. A much higher level of cleaning treatment is possible compared with the case of cleaning the raw material. In particular, the coarsely pulverized injection-molded boots can be effectively washed during transportation by being transported to the next step while being stirred with a screw conveyor together with water or detergent.
[0033]
【Effect of the invention】
As described above, according to the present invention, used injection-molded boots are collected, and the collected injection-molded boots are washed, coarsely pulverized, fractionated, and subsequently pelletized. The work boots used in the factory can be effectively regenerated and reused. Especially, the work boots used in the factory can be collected at a level of 1000 to 2000 feet from one factory. Since it is possible, it is possible to easily construct an injection-molded shoe recycling system between shoe manufacturers and various factories that are users, and it is possible to effectively use resources and solve waste problems.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a recycle injection molded boot showing an embodiment of the present invention.
FIG. 2 is a diagram showing a step of recycling an injection-molded boot.
FIG. 3 is a view showing a procedure for crushing and separating injection-molded boots in a recycling step.
FIG. 4 is a diagram showing the structure of a pulverizer.
FIG. 5 is a diagram showing the structure of a secondary pulverizer.
[Explanation of symbols]
B Boots MB Used injection-molded boots 1 Boots main body 2 Lining 3 Textile waste 4 Coarse particles 4a Fine particles 5 Recycled pellets 6 Crusher 7 Water supply pipe 8 First blower 9 Dehydrator 10 First cyclone 11 Secondary crusher 12 Second blower 13 Second cyclone 14 Hopper 15 Bag filter 16 Third blower 17 Third cyclone 61 Hopper 62 Rotary blade 63 Conveyor device 64 Water supply pipe 65 Screw conveyor 111 Hopper 112 Rotary blade

Claims (3)

It is a method of collecting used business boots, recycling the collected boots to their raw materials and recycling them, and has a cleaning process, a coarse pulverization process, a separation process, and a pelletization process,
Work boots for business use are the same material, regardless of size, are manufactured in a uniform color, and are injection-molded boots in which the boot boot body and the lining are integrated.
The boots body is a synthetic resin layer injection-molded using shoe materials,
The lining is a backing cloth that is integrally laminated on the inner surface of the synthetic resin layer of the boots body,
The cleaning process is a process to wash off the deposits on the injection molded boots.
The coarse pulverization process is a process of pulverizing the injection-molded boots into coarse particles,
Fractionation process, the synthetic resin together with the coarse particles of injection molding boots milled by the coarse grinding process further ground to fine, a process of separating into a fiber維屑lining,
The pelletizing process is a process of granulating the fine particles of the synthetic resin obtained by the fractionation process to regenerate the raw material pellets of the shoe material of the boots body,
The method for recycling an injection-molded boot, wherein the washing process is performed while the injection-molded boot is crushed into coarse grains by a coarse pulverization process.   2. The method for recycling injection-molded boots according to claim 1, wherein the washing process and the coarse pulverization process are performed simultaneously, and the coarse pulverization process is followed by a washing process.   2. The method for recycling injection-molded boots according to claim 1, wherein coarse particles of the roughly-molded injection-molded boots are washed during transportation to the next step while being stirred with a screw conveyor together with water or a detergent.

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