LDPE, scientific name of high-pressure polyethylene, generally refers to plastic packaging film. Such as: woven bag lining film, food packaging film, daily necessities packaging film, greenhouse film. Most of these films are natural colors, but also light blue and black. It is best to separate color samples before recycling.

 

It is not possible to put low-pressure membranes and PP membranes together, let alone OPP and pvc membranes. Recycling and reuse of LDPE is process of regenerating LDPE. There are four main processes in the entire recycled LDPE process.

Effect of crushing and washing with water is better. Since some good high-pressure membranes are kept sufficiently clean, they can be blown again without adding new materials. Therefore, it is necessary to pay attention to cleaning during crushing process. When crushed material flows into sink, it is best to roll it again for purpose of further washing and cleaning points.

Generally, remaining water is dried in a spin dryer, and dried if possible. This can save electricity and improve quality. Of course, attention should be paid to prevent secondary pollution of materials during drying.

Pellets produced by a special extruder have two basic uses: film blowing and injection molding.
Material coming out of 60 to 80 mesh filter can be blown again; material coming out of 40 to 60 mesh filter can meet quality requirements of injection molding. Generally speaking, high-pressure material is blown again, good blown natural color almost blows black film and garbage bags. Price after plastic injection is lower.

In this process, attention must be paid to distinguishing label when packaging. One for blow molding and one for injection molding, so as not to make mistakes. In addition, packaging bag used for blow molding must be lined with an outer bag to avoid secondary pollution.

Most of PP comes from daily necessities, such as plastic boxes, foot basins, buckets, rice-washing baskets, plastic chairs, stools, woven bags, and other packaging woven fabrics, packing belts, etc.
1. Separate colors of various materials first, because separation will make users convenient and price can be high.
2. Bring water to smash and rinse, to spin dryer to dry remaining water, then carry out sun-drying and bagging. Use a mixer to mix, add some colors and additives.
3. Special plastic machine is used for on-car granulation, but granulation temperature should not be too high, it is easy to become brittle, so be sure to pay attention to temperature.
4. Water-cooled pelleting must be standard 3X4mm, otherwise appearance of the best material will not look good or standard.

PET, scientific name: polyethylene terephthalate, it is a linear thermoplastic.
PET is usually a kind of crystalline plastic. Due to its light weight, inability to break, and low energy consumption, PET bottles have replaced some traditional packaging materials and are widely used in food, beverages, cosmetics and other fields. Recycling and reuse of PET is process flow of recycled PET.
Recycling process of PET bottle flakes is to separate PET bottle body from cap, label, etc., then pulverize, clean, and dry.
Its specific process is as follows:
1. The first step is selection process: various PET bottle flakes are selected and classified. Tear off outer trademarks. Most of these trademarks are OPP, some PVC shrink films must be peeled off first.
2. In crushing process, rinse with water during crushing process to remove dirt from various PET bottle flakes.
3. Put these pieces into a steam treatment device, caustic soda to remove greasy and other stubborn impurities.
4. Rinse with clean water, shake off remaining water and pack it into a bag. Then go to vacuum oven for drying.
5. Spinning, finalizing, spreading with hot water and steam, and finalizing.

ABS plastic, most of which comes from electrical products, a variety of daily necessities and some small mechanical parts.
1. For ABS, the most common ones are computer case, TV case, instrument case, car panel, and decoration materials. Materials should be separated, especially electroplating, spray paint color, etc. should be separated.
2. Chemical treatment, deplating, and depainting, but deplating and depainting must be cautious. Because chemical solution has a certain ratio, protective equipment and containers must be used, otherwise it will cause injury and other incidents.
3. Cleaning tank is cleaned, then dried, color-matched or auxiliary materials are placed, purpose is to improve quality.
4. Special extruder is used to granulate, but filter must be put on, filter should be placed according to requirements of product.

Polycarbonate, amorphous plastics, engineering plastics. Most of them come from textile accessories, car headlights, taillights, turn signals, candy making molds, discs, telecommunications equipment, photographic equipment, etc.
1. First select purchased PC. Some are transparent and opaque. Blue, red, green and black must be separated; there are also modified ones, such as most of textile accessories are modified; such as discs and lamp caps are all coated.
2. Deplating process for cleaning various colors of PC, and disc lamp holders, also operates in same principle as ABS. Then they are dried, classified and sent to extruder for production.
3. Some PCs are more yellow and can produce porcelain white; transparent ones can still be produced transparent; other colors can be added with coloring agents and material additives.
4. Special extruder is used for granulation, but PC itself is easy to age, so it cannot be recycled many times. Granulation must be cautious, pellets are cut and packaged.

Most of hard PVC materials come from building materials, plastic steel windows and doors, electroplated hard plates, plastic valves for chemical plants, sewer pipes, and decorative materials.
1. First select process and separate colors. These materials are largely divided into three types: white, gray, and black, but do not mix PP and PE into them.
2. Go to pulverizer to smash, but it is also smashed with water. Remove pollution and wash with water, then dry it to prevent secondary pollution.
3. On mixing machine, do ingredients and mix. If it is a white material, add some coloring agent, and add auxiliaries as needed.
4. Special PVC extruder for scraping pellets, cooling and bagging