The plastics that make up the film are PVC, PP, PE, and the like. The main products are shrink film, cling film, packaging paper, packaging bags, transparent tape, flat woven bags, flat woven cloth ... ... and so on. Mostly used for packaging.
The thickness of a typical film is about 0.01 mm to 0.08 mm. Molding methods include blow molding and flat die extrusion of disc molds. Some of the molding types often use longitudinal extension to increase the toughness of the product. The main equipment for the molding process of these products is the extruder (EXTRUDER), which is produced in a continuous molding process. In the initial production (before printing), in order to meet the required size of the product, excess edge material must be cut. , also known as ear material.
Traditionally, the industry will take the earstock into bundles and sell it to the purchaser to make recycled secondary materials, or make recycled pellets for other different products. This recycling method can no longer meet the requirements of modern and highly competitive business management. Because it is not economical, the cost is too high.
"Immediate recovery" means: 1. Cutting the film ear material, simultaneously taking the film ear material, 2. Feeding it into a closed grinder, crushing, 3. Immediately cooperating with the conveying process, 4. Using the quantitative ratio and raw materials Automatic mixing, recycling of recycled original products. This can improve traditional recycling problems, reduce costs, and improve economic and management benefits.
Now the above four steps are further described as follows:
First, immediately synchronous withdrawal In theory, the film will produce a large static electricity in the production, some factories will install a static elimination machine to deal with, but the large number of factories do not have this equipment, so the ear material is also charged with static electricity, it will absorb air The dust in the surface causes surface contamination. The immediate requirement for recycling is that the ear should be treated before it is contaminated to maintain the same quality as the product made from the raw material.
Then, "synchronous withdrawal" is to make the recovery of the ear material the same as the production speed of the film: if the taking speed is too fast, the ear material will be broken; if it is too slow, the ear material will droop, touch the ground, and be contaminated with dust or oil. .
In the use of mechanical equipment, there are two types of synchronous extraction:
1. If the thickness of the film is more than 0.05mm or the width of one side of the ear material is more than 50mm, use a fixed-pitch motor to drive a group of acquisition wheels to draw the job. This method is relatively simple in design theory, but the mechanical structure is more complex, the cost is higher, and of course the price is higher.
2. In addition, one way is to use a high-pressure windmill to connect an air inlet to attract the ear material. Only in the design, the wind pressure and air volume of windmills must be matched properly. That is to say, this method is technically high in design, but because of its simple structure, low failure rate, convenient operation, and low equipment cost, it is more suitable. Economic benefits.
Second, crushing and sealing in a closed crusher is to prevent the ear material from being contaminated, the pulverized material not to be sprayed when the pulverized material is crushed, and to maintain the attraction of the windmill (synchronous extraction) and the like.
Thin film thickness is very thin, sometimes vertical longitudinal extension, toughness, not easy to smash, so the choice of crushing blade is very important, preferably tungsten alloy steel, high wear resistance, heat treatment hardness can reach HrC75 degrees about.
In addition, the fineness of the crushing must be less than 4mm, and the cut-off opening needs to be neat and consistent, such as the zigzag shape, which cannot be broken. Therefore, the gap structure between the rotary cutter and the fixed cutter of the drive spindle of the shredding machine must be able to be adjusted to 0.05 Mmm or less.
Crushing is the first step in recycling, and no matter how it is recycled, this process cannot be skipped. The above-mentioned several points, in addition to the general need to pay attention to smash the film, especially in the "recovery" immediately ear, it is absolutely necessary.
Third, immediately with the conveying process This is an important point in the automation equipment.
This process mainly includes a blower, a conveying pipe, and a cyclone wind separator. In fact, the first “immediate synchronization acquisition†mentioned earlier is to rely on the high wind pressure generated by the windmills to inhale the ear material, enter the closed crushing room and crush it into pieces of 4 mm or less, and then use the conveying pipe to scrap the material. Feed into the cyclone separator.
The function of the cyclone separator is to separate the high pressure air flow delivered by the windmill from the scrap. As soon as the air flow enters the cyclone separator, it will produce a tornado-like, central vacuum force that will be discharged from the top outlet by the rotating centrifugal force. The scrap fell from the inverted conical shape and entered the next recycling operation.
The three kinds of equipment in this paragraph are certain matching and are indispensable.
4. Quantitative ratio and raw materials are automatically mixed and recycled. In order to ensure stable quality of the products produced after recycling, the cleanliness of the ear must be required, and the mixing of the quantitative ratio with the raw materials is also very important.
According to empirical data, the mixing ratio of the ear material after crushing must not be less than 10%. The crushed pieces of the ear material, which are light in weight and contain static electricity, are easy to combine with each other and float. It is necessary to use a forced mixing device to stabilize the feeding material of the feeding extruder.
Another point to note is that due to the inclusion of the Crushing Division in the recycled mix, the bulk density is different between the recycled mix and the raw material. Therefore, in the process, the screw speed of the high pressure extruder must be adjusted to increase the compression ratio. Only then can the extruder discharge its original shape.
The above mentioned methods and equipment concepts for immediate recovery of film ear material are discussed. In the consensus of the “global village†today, cherishing the resources of the earth and safeguarding the global environment are the responsibility of modern people. We must do our best to pay for it. The manufacturers of plastic machinery in countries around the world also attach great importance to the research and development of recycling equipment. On the immediate automatic recycling equipment for thin-film otoscopes, Nissan and German-made products all favor high-priced products (about RMB27,700,000 yuan or more). There are few products that are more economical, so users are not universal. At present, Dongguan Jianji Machinery Co., Ltd. has produced such equipment at a reasonable price and has applied for patents in many countries. Those in need may apply for treatment. ("Plastics Technology and Equipment")
The thickness of a typical film is about 0.01 mm to 0.08 mm. Molding methods include blow molding and flat die extrusion of disc molds. Some of the molding types often use longitudinal extension to increase the toughness of the product. The main equipment for the molding process of these products is the extruder (EXTRUDER), which is produced in a continuous molding process. In the initial production (before printing), in order to meet the required size of the product, excess edge material must be cut. , also known as ear material.
Traditionally, the industry will take the earstock into bundles and sell it to the purchaser to make recycled secondary materials, or make recycled pellets for other different products. This recycling method can no longer meet the requirements of modern and highly competitive business management. Because it is not economical, the cost is too high.
"Immediate recovery" means: 1. Cutting the film ear material, simultaneously taking the film ear material, 2. Feeding it into a closed grinder, crushing, 3. Immediately cooperating with the conveying process, 4. Using the quantitative ratio and raw materials Automatic mixing, recycling of recycled original products. This can improve traditional recycling problems, reduce costs, and improve economic and management benefits.
Now the above four steps are further described as follows:
First, immediately synchronous withdrawal In theory, the film will produce a large static electricity in the production, some factories will install a static elimination machine to deal with, but the large number of factories do not have this equipment, so the ear material is also charged with static electricity, it will absorb air The dust in the surface causes surface contamination. The immediate requirement for recycling is that the ear should be treated before it is contaminated to maintain the same quality as the product made from the raw material.
Then, "synchronous withdrawal" is to make the recovery of the ear material the same as the production speed of the film: if the taking speed is too fast, the ear material will be broken; if it is too slow, the ear material will droop, touch the ground, and be contaminated with dust or oil. .
In the use of mechanical equipment, there are two types of synchronous extraction:
1. If the thickness of the film is more than 0.05mm or the width of one side of the ear material is more than 50mm, use a fixed-pitch motor to drive a group of acquisition wheels to draw the job. This method is relatively simple in design theory, but the mechanical structure is more complex, the cost is higher, and of course the price is higher.
2. In addition, one way is to use a high-pressure windmill to connect an air inlet to attract the ear material. Only in the design, the wind pressure and air volume of windmills must be matched properly. That is to say, this method is technically high in design, but because of its simple structure, low failure rate, convenient operation, and low equipment cost, it is more suitable. Economic benefits.
Second, crushing and sealing in a closed crusher is to prevent the ear material from being contaminated, the pulverized material not to be sprayed when the pulverized material is crushed, and to maintain the attraction of the windmill (synchronous extraction) and the like.
Thin film thickness is very thin, sometimes vertical longitudinal extension, toughness, not easy to smash, so the choice of crushing blade is very important, preferably tungsten alloy steel, high wear resistance, heat treatment hardness can reach HrC75 degrees about.
In addition, the fineness of the crushing must be less than 4mm, and the cut-off opening needs to be neat and consistent, such as the zigzag shape, which cannot be broken. Therefore, the gap structure between the rotary cutter and the fixed cutter of the drive spindle of the shredding machine must be able to be adjusted to 0.05 Mmm or less.
Crushing is the first step in recycling, and no matter how it is recycled, this process cannot be skipped. The above-mentioned several points, in addition to the general need to pay attention to smash the film, especially in the "recovery" immediately ear, it is absolutely necessary.
Third, immediately with the conveying process This is an important point in the automation equipment.
This process mainly includes a blower, a conveying pipe, and a cyclone wind separator. In fact, the first “immediate synchronization acquisition†mentioned earlier is to rely on the high wind pressure generated by the windmills to inhale the ear material, enter the closed crushing room and crush it into pieces of 4 mm or less, and then use the conveying pipe to scrap the material. Feed into the cyclone separator.
The function of the cyclone separator is to separate the high pressure air flow delivered by the windmill from the scrap. As soon as the air flow enters the cyclone separator, it will produce a tornado-like, central vacuum force that will be discharged from the top outlet by the rotating centrifugal force. The scrap fell from the inverted conical shape and entered the next recycling operation.
The three kinds of equipment in this paragraph are certain matching and are indispensable.
4. Quantitative ratio and raw materials are automatically mixed and recycled. In order to ensure stable quality of the products produced after recycling, the cleanliness of the ear must be required, and the mixing of the quantitative ratio with the raw materials is also very important.
According to empirical data, the mixing ratio of the ear material after crushing must not be less than 10%. The crushed pieces of the ear material, which are light in weight and contain static electricity, are easy to combine with each other and float. It is necessary to use a forced mixing device to stabilize the feeding material of the feeding extruder.
Another point to note is that due to the inclusion of the Crushing Division in the recycled mix, the bulk density is different between the recycled mix and the raw material. Therefore, in the process, the screw speed of the high pressure extruder must be adjusted to increase the compression ratio. Only then can the extruder discharge its original shape.
The above mentioned methods and equipment concepts for immediate recovery of film ear material are discussed. In the consensus of the “global village†today, cherishing the resources of the earth and safeguarding the global environment are the responsibility of modern people. We must do our best to pay for it. The manufacturers of plastic machinery in countries around the world also attach great importance to the research and development of recycling equipment. On the immediate automatic recycling equipment for thin-film otoscopes, Nissan and German-made products all favor high-priced products (about RMB27,700,000 yuan or more). There are few products that are more economical, so users are not universal. At present, Dongguan Jianji Machinery Co., Ltd. has produced such equipment at a reasonable price and has applied for patents in many countries. Those in need may apply for treatment. ("Plastics Technology and Equipment")
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