It has been reported that long-term consumption of food contaminated by polyethylene molecules will make people dizzy, headache, nausea, loss of appetite, memory loss, and even anemia. Therefore, it is harmful to human health to bottle vinegar in plastic bottles. Therefore, glassware should be used in the family instead of plastic products to hold seasonings and so on. When using plastic products, special attention should be paid to avoid contact with vinegar, detergents, etc., and avoid direct sunlight and high temperature, so as to avoid chemical reactions. In addition, when you buy plastic tableware, you should choose plastic products with PE (polyethylene) or PP (polypropylene) labels, few decorative patterns, colorless and tasteless, and smooth surfaces.
There are many ways to make polyethylene, and the most common one is to polymerize ethylene at 2 ~ 3℃ and 1 ~ 2 atmospheric pressure. In polyethylene, no other substances are doped. The polyethylene prepared in this way has low density, soft texture and high stability to sunlight, air, moisture and chemical reagents, so there is no need to add stabilizers and plasticizers, which are mostly toxic or highly toxic.
About recycling:
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Tuesday
Introduction of specific methods of producing shoe last with recycled polyethylene (PE) plastics
Introduction of specific methods of producing shoe last with recycled polyethylene (PE) plastics
Author: anonymous Article source: Unknown number of hits: 1263
Polyethylene (PE). The raw material of polyethylene is milky white, non-toxic, tasteless and waxy particles with shiny surface. Commonly used in packaging film, agricultural film, injection molding products, cable sheath, blow molding products, packaging boxes, turnover boxes and so on. Polymer of ethylene and propylene, often used in food packaging or turnover boxes. Polymers of ethylene and butene are commonly used in the above raw materials, including degradable or non-degradable polyethylene, high-pressure polyethylene and compression polyethylene, and all colors can be mixed without decoloration. Firstly, the recycled waste polyethylene should be cleaned, degreased and dried. If possible, it can be granulated by a granulator, and if not, it should be crushed or cut into pieces, and then it should be added into the hopper of an injection molding machine. The temperature of the injection molding machine should be: 15℃ in the feeding section, 17℃ in the middle section and 2℃ in the machine head. After the polyethylene is heated, it can be freely poured into the shoe last mold by the machine head. After it is filled, it should be put into water at 2-5℃ for cooling and setting for 2 hours. After cooling, demoulding is the blank of plastic shoe last, and the blank is processed by imitation tin to obtain the finished shoe last.
Last is the mold in shoemaking production. The color and composition of recycled polyethylene will not affect the quality of finished shoes. The recycled waste polyethylene can be used directly without adding any auxiliary materials. The cost of producing shoe last by using waste polyethylene is the sum of the cost of recycling polyethylene waste, cleaning, granulating, injecting last blank, tin last type and other related expenses. The weight of each pair of shoe last is about 1.5-2kg, and the price of the finished men's and women's shallow last is 17-19 yuan, with considerable profit. There are 3,665 shoe-making enterprises in China, and the annual weight of last is about 5 million pairs, so the development prospect is very optimistic.
Using waste polyethylene to produce shoe last can replace wood last and reduce deforestation resources. Plastic shoe last can be recycled at a discount after use, and it can be processed into a new last after crushing, which can be recycled to realize white pollution resources. Waste polyethylene can also be used to produce industrial material turnover boxes, packaging materials, agricultural fruit and vegetable turnover boxes and other products, which need further development and utilization.
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