※ Polyethylene waste
Polyethylene is the largest plastic in plastics and is used in a wide range of thermoplastics. It is made of ethylene and is a partially crystalline material. It can be processed by the molding method of general thermoplastics. Polyethylene can be divided into high-density polyethylene, low-density polyethylene and linear low-density polyethylene three categories.
The density of high density polyethylene is generally higher than 0.94g/, while the density of low density polyethylene and linear low density polyethylene is between 0.91~0.94g/cm. There are two main sources of waste polyethylene film:
1. Scraps, defectives, etc. produced in film production. These wastes are clean and clearly categorized. They can be crushed, compressed, and sent directly to the extruder for pelletizing. The recycling process is simpler.
2. Waste films from the chemical industry, electrical industry, food and consumer goods industries. These waste films have been contaminated, some have been colored and printed with trademarks, and some contain impurities such as sand, sawdust or shredded paper.
Polyethylene is widely available because of its low cost and easy availability, but it is still the most widely used packaging product, estimated at 60% or more. High-density polyethylene is mainly used for packaging films and bottles, hollow containers; the main purpose of low-density polyethylene is packaging film and agricultural film; linear low-density polyethylene is mainly used for film, film plastic parts, pipe And on the wire and cable.
※ PVC waste
Polyvinyl chloride has historically used the largest amount of plastic, and is now being replaced by polyethylene and PET in some areas, but it is still in heavy use. Its consumption is second only to polyethylene and polypropylene. PVC products are very rich in forms and can be divided into three categories: hard PVC, soft PVC, and PVC paste. Hard PVC is mainly used for extruded products such as pipes, window profiles, and sheet materials, as well as injection molded parts such as pipe joints and electrical parts, and extrusion blow-type bottles, which account for about 65% of the consumption of polyvinyl chloride. Soft PVC is mainly used in calendered films, car accessories, handbags, films, labels, wire and cable, and medical products. Polyvinyl chloride paste accounts for about 10% of PVC products, mainly used products such as plastic products.
※ Polymethyl methacrylate waste
Polymethyl methacrylate (PMMA) is commonly known as plexiglass. PMMA has unique properties that other plastics do not have: excellent transparency (close to glass); toughness, chemical resistance, and weatherability are all good. Therefore, it has been widely used in automobiles, medical equipment, indoor swimming pools, etc. With the development of related industries such as automobiles, the amount of PMMA is also increasing. There are mainly three types of PMMA products: sheets made by casting or extrusion; specific products that already contain modifiers, pigments, and other additives; paints and coatings.
※ Polystyrene waste
Polystyrene is a homopolymer of styrene, a thermoplastic general-purpose plastic, and its output is second only to polyethylene, polypropylene, and polyvinyl chloride. Polystyrene has a wide range of applications. It can be roughly divided into the following four aspects:
General Purpose Polystyrene: A large number of products for daily use as well as transparent products such as home appliances, computers, and medical supplies.
High-impact polystyrene: It greatly improves its impact strength and elongation at break. The products are widely used in electrical accessories, home appliances, food containers and so on.
Extruded Expanded Polystyrene Sheets and Thermoformed Products: Thick sheets are mainly used for thermal insulation, sound insulation, and shockproof materials. Thermoformed products are used in large quantities in food packaging and fast food containers.
Expandable Polystyrene Foam Products: Products are used for shockproof packaging of electrical appliances, insulation materials for construction, freezing and other industries.
The first two kinds of polystyrene products have long service life, and the waste thickness can be recovered by conventional recycling methods, so the pressure on the environment is also small. Afterwards, the second type of polystyrene products are mostly disposable packaging. They are bulky and consume large amounts. If they are disposed of without disposal, they will cause great pressure on the environment. A large part of what people often say “white pollution†is foamed polystyrene.
※ Polyethylene terephthalate waste
Polyethylene terephthalate (PET) is a polycondensation product of terephthalic acid or dimethyl terephthalate and ethylene glycol ester and is a linear thermoplastic. PET is usually a crystalline plastic, but in the bottle and film products, for its high degree of transparency, special process conditions can be used to make it amorphous.
PET has a wide range of uses due to its excellent performance, low cost, and high versatility. According to its product form, it can be divided into four categories: polyester fiber, film, engineering injection molded parts, bottles. Due to its advantages of light weight and low energy consumption, PET bottles have replaced some traditional packaging materials and have been widely used in food, beverages, cosmetics and other fields. Especially for beverage bottles, PET has taken an absolute advantage. Beverage bottles are disposable, so they are extremely wasteful.
PET bottle recycling technology has reached a very high level in foreign countries, the United States, Germany and other countries have now reached more than 80% recovery rate. Moreover, in order to facilitate recycling, these countries have also formulated some local laws and regulations that oblige the disposal, collection, use, and design of PET bottles.
Polyethylene is the largest plastic in plastics and is used in a wide range of thermoplastics. It is made of ethylene and is a partially crystalline material. It can be processed by the molding method of general thermoplastics. Polyethylene can be divided into high-density polyethylene, low-density polyethylene and linear low-density polyethylene three categories.
The density of high density polyethylene is generally higher than 0.94g/, while the density of low density polyethylene and linear low density polyethylene is between 0.91~0.94g/cm. There are two main sources of waste polyethylene film:
1. Scraps, defectives, etc. produced in film production. These wastes are clean and clearly categorized. They can be crushed, compressed, and sent directly to the extruder for pelletizing. The recycling process is simpler.
2. Waste films from the chemical industry, electrical industry, food and consumer goods industries. These waste films have been contaminated, some have been colored and printed with trademarks, and some contain impurities such as sand, sawdust or shredded paper.
Polyethylene is widely available because of its low cost and easy availability, but it is still the most widely used packaging product, estimated at 60% or more. High-density polyethylene is mainly used for packaging films and bottles, hollow containers; the main purpose of low-density polyethylene is packaging film and agricultural film; linear low-density polyethylene is mainly used for film, film plastic parts, pipe And on the wire and cable.
※ PVC waste
Polyvinyl chloride has historically used the largest amount of plastic, and is now being replaced by polyethylene and PET in some areas, but it is still in heavy use. Its consumption is second only to polyethylene and polypropylene. PVC products are very rich in forms and can be divided into three categories: hard PVC, soft PVC, and PVC paste. Hard PVC is mainly used for extruded products such as pipes, window profiles, and sheet materials, as well as injection molded parts such as pipe joints and electrical parts, and extrusion blow-type bottles, which account for about 65% of the consumption of polyvinyl chloride. Soft PVC is mainly used in calendered films, car accessories, handbags, films, labels, wire and cable, and medical products. Polyvinyl chloride paste accounts for about 10% of PVC products, mainly used products such as plastic products.
※ Polymethyl methacrylate waste
Polymethyl methacrylate (PMMA) is commonly known as plexiglass. PMMA has unique properties that other plastics do not have: excellent transparency (close to glass); toughness, chemical resistance, and weatherability are all good. Therefore, it has been widely used in automobiles, medical equipment, indoor swimming pools, etc. With the development of related industries such as automobiles, the amount of PMMA is also increasing. There are mainly three types of PMMA products: sheets made by casting or extrusion; specific products that already contain modifiers, pigments, and other additives; paints and coatings.
※ Polystyrene waste
Polystyrene is a homopolymer of styrene, a thermoplastic general-purpose plastic, and its output is second only to polyethylene, polypropylene, and polyvinyl chloride. Polystyrene has a wide range of applications. It can be roughly divided into the following four aspects:
General Purpose Polystyrene: A large number of products for daily use as well as transparent products such as home appliances, computers, and medical supplies.
High-impact polystyrene: It greatly improves its impact strength and elongation at break. The products are widely used in electrical accessories, home appliances, food containers and so on.
Extruded Expanded Polystyrene Sheets and Thermoformed Products: Thick sheets are mainly used for thermal insulation, sound insulation, and shockproof materials. Thermoformed products are used in large quantities in food packaging and fast food containers.
Expandable Polystyrene Foam Products: Products are used for shockproof packaging of electrical appliances, insulation materials for construction, freezing and other industries.
The first two kinds of polystyrene products have long service life, and the waste thickness can be recovered by conventional recycling methods, so the pressure on the environment is also small. Afterwards, the second type of polystyrene products are mostly disposable packaging. They are bulky and consume large amounts. If they are disposed of without disposal, they will cause great pressure on the environment. A large part of what people often say “white pollution†is foamed polystyrene.
※ Polyethylene terephthalate waste
Polyethylene terephthalate (PET) is a polycondensation product of terephthalic acid or dimethyl terephthalate and ethylene glycol ester and is a linear thermoplastic. PET is usually a crystalline plastic, but in the bottle and film products, for its high degree of transparency, special process conditions can be used to make it amorphous.
PET has a wide range of uses due to its excellent performance, low cost, and high versatility. According to its product form, it can be divided into four categories: polyester fiber, film, engineering injection molded parts, bottles. Due to its advantages of light weight and low energy consumption, PET bottles have replaced some traditional packaging materials and have been widely used in food, beverages, cosmetics and other fields. Especially for beverage bottles, PET has taken an absolute advantage. Beverage bottles are disposable, so they are extremely wasteful.
PET bottle recycling technology has reached a very high level in foreign countries, the United States, Germany and other countries have now reached more than 80% recovery rate. Moreover, in order to facilitate recycling, these countries have also formulated some local laws and regulations that oblige the disposal, collection, use, and design of PET bottles.
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