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Identification methods and identification knowledge of waste plastics

Classification Methods of Common Waste Plastics

The first simple way to distinguish: it is a unified method for our country and the world, which is the common plastic recycling mark.

Polyethylene PE is Milky White translucent and waxy when not colored. Touch the product with your hand with a smooth feeling, soft and tough; Slightly elongated. Generally low density polyethylene is soft and transparent; high density polyethylene is hard. Plastic film, handbags, water pipes, oil drums, beverage bottles (calcium milk bottles), daily necessities, etc.

Polypropylene PP is white translucent and waxy when uncolored; lighter than polyethylene. Transparency is also better than polyethylene, rigid than polyethylene. Basins, buckets, furniture, films, woven bags, bottle caps, car bumpers, etc.

The polystyrene PS is transparent when uncolored. When the product falls to the ground or is knocked, it has a metal-like crisp sound, good luster and transparency, similar to glass, brittle and easy to break, and can be marked on the surface of the product with fingernails.

The modified polystyrene is opaque. PVC nature of stationery, cups, food containers, home appliance shells, electrical accessories, etc. is yellowish translucent and shiny. Transparency is better than polyethylene and polystyrene, and worse than polystyrene. With the different dosage of additives, it is divided into soft and hard polyvinyl chloride. Soft products are soft and tough, and feel sticky. The hardness of hard products is higher than that of low density polyethylene, but lower than that of polypropylene. Whitening will occur at the bend.

There are too many plastic products in our daily process, which can be recycled. For newcomers to the recycled plastics industry, knowledge is basic and most important.

The five major plastic products are the most common, and there are many ways to distinguish them. They can be distinguished according to the purpose, according to the raw materials, and according to the density.

2. distinguish plastic products by burning and smell.

3. Use Differentiation

According to the use to distinguish, the use methods of polyethylene and polypropylene have some similarities, ABS and PS also have some similarities, the distinction is not particularly fine.

PE common products: handbags, water pipes, oil drums, beverage bottles (calcium bottles), daily necessities, etc. High pressure and linearity are often used in films, such as industrial films, agricultural films, and convenient bags. And low pressure can be used for packaging, injection molding, hollow, etc.

PP common products: basins, barrels, furniture, film, woven bags, bottle caps, car bumpers, non-woven fabrics, etc. Used for wire drawing, injection molding, and more barrel blowing

Polystyrene PS common products: stationery, cups, toys, food containers, home appliance shells, foaming packaging materials, electrical accessories, etc. The main purpose is injection molding, foaming, blister, etc.

PVC common products: plates, pipes, soles, toys, doors and windows, wire skins, stationery, medical supplies, etc. For motorcycle accessories, injection molding products more.

PET common products: often for the bottle products such as cola, mineral water bottles, etc., mainly used for chemical fiber, injection molding and so on.

4. appearance feel distinction

According to the appearance and feel to distinguish, plastic see more, a look will know the main components of the base, so the appearance of this aspect is also very important.

PE (name: polyethylene): sensory identification: soft: white transparent, but the transparency of the general, often tape and printed words. (Note: Tape and printed words are inevitable, but must control its content, because these will affect the price in the market) When not colored, it is Milky White translucent and waxy; touch the product with the hand has a creamy feeling, Soft and tough; slightly able to stretch. Generally low density polyethylene is soft and transparent; high density polyethylene is hard.

PP (polypropylene): sensory identification: this product is white transparent compared with LDPE transparency is higher, when kneading sound. White translucent, waxy when uncolored; lighter than polyethylene. Transparency is also better than polyethylene, rigid than polyethylene.

PVC film (polychlorinated) color is slightly yellow translucent, shiny. Transparency is better than polyethylene and polystyrene, and worse than polystyrene. With the different dosage of additives, it is divided into soft and hard polyvinyl chloride. Soft products are soft and tough, and feel sticky. The hardness of hard products is higher than that of low density polyethylene, but lower than that of polypropylene. Whitening will occur at the bend.

The polystyrene PS is transparent when uncolored. When the product falls to the ground or is knocked, it has a metal-like crisp sound, good luster and transparency, similar to glass, brittle and easy to break, and traces can be drawn on the surface of the product with fingernails. The modified polystyrene is opaque.

Polyethylene terephthalate PET has good transparency, strength and toughness are better than polystyrene and polyvinyl chloride, and it is not easy to break. White transparent, feel hard, rubbing when there is a sound. Appearance like PP.