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1. Regenerative LDPE process
LDPE, generally refers to low density polyethylene, also known as high pressure polyethylene.It 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 color, but also light blue, black, in the recycling before the best to separate the color sample.Do not put low pressure membrane,PP membrane together, let alone OPP and PCV membrane.The recovery and reuse of LDPE is the process of LDPE regeneration.The whole regenerative LDPE process consists of four processes.
1. Crushing process
The effect of grinding and washing with water is better.Because some good high pressure film if kept clean enough, without adding new material can be re-blown film.So in the crushing process should pay attention to cleaning, when the crushing material flow to the sink after the best rolling again, in order to further rinse the cleaning point.
2. Drying process
It is generally to the dryer to dry the remaining water, if the conditions are available for drying, so as to save electricity, improve the quality, of course, we should pay attention to prevent the secondary pollution of materials in the drying.
3. Granulation process
Particles made by special extruder have two basic uses: re-blow film and injection molding.Material from 60 to 80 mesh filters can be blown again;Material produced from 40 to 60 mesh filters can meet the quality requirements for injection molding.Generally speaking, the high pressure material is blown again, and the good quality is almost blown black film and garbage bags. The price of plastic injection is lower.
4. Granulating process
It is usually cut in cold water.In this process, attention must be paid to the labeling of packaging.One for blow molding and one for injection molding, in case of mistake.In addition, blow molding bags must be outside the bag with inner bag to avoid secondary pollution.
2. Regenerated polypropylene (PP) process
PP mostly from daily necessities, plastic boxes, foot basins, buckets, rice baskets, plastic chairs, stools, woven bags and other packaging woven cloth, packing belt, etc.
1, first of all, separate the colors of various materials, because it will be convenient for users to separate, the price can also be high.
2. Crush and rinse with water, dry the remaining water with the dryer, and then dry and bag.Mix with mixer and add color and additives.
3. Special plastic machine for car granulation, but the granulation temperature should not be too high, it is easy to be brittle, so we must pay attention to the temperature.
4, water-cooled cutting, to the standard 3X4mm, otherwise it is not good material out of the appearance is not beautiful, standard.
3. Regenerated polyethylene terephthalate (PET) process
PET, scientific name: polyethylene terephthalate, it is a linear thermoplastic.PET is usually a crystalline plastic. PET bottles replace some traditional packaging materials due to their light weight, non-fragile and low energy consumption, and are widely used in food, beverage, cosmetics and other fields.Recycling and reuse of PET is the process of regenerative PET.
The recycling process of PET bottle sheet is to separate the PET bottle body from the cap, label and so on, and then crush, clean and dry.Its specific process is as follows:
1, the first is the selection process: all kinds of PET bottle slices to be selected and classified.Tear off the outside trademarks, most of which are OPP, but also some POLYvinyl chloride shrink film, which must be peeled off first.
2, the pulverization process, in the crushing process with water rinse, remove all kinds of PET bottle pieces in the dirt.
3, put the debris into the steam treatment device, add alkali tablet, remove greasy and other stubborn impurities.
4, clean with clean water, shake off the remaining water and bag.Then go to the vacuum oven to dry.
5, spinneret, finalize, with hot water steam extension, finalize.
4. Process flow of recycled ABS plastics
ABS plastic, mostly from electrical products, a variety of daily necessities and some mechanical small parts.
1, ABS is more of the brain case, TV case, instrument case, car panel, decorative materials, the material is separated, especially electroplating, spray paint color to separate.
2, chemical treatment, deplating, paint, but deplating paint must be careful, because the chemical potion has a certain ratio, to use protective equipment and containers, otherwise it will cause injuries and other events.
3, the cleaning tank to clean, and then to dry, color or put auxiliary materials, the purpose is to improve the quality.
4, special extruder to granulation, but must put on the filter screen, but the filter screen according to product requirements.
5. Recycled polycarbonate (PC) process
Polycarbonate, non-crystalline plastics, engineering plastics.Mostly from textile accessories, automobile headlights, taillights, turn signals, candy making molds, discs, telecommunications equipment, photographic equipment and so on.
1, first of all, the acquisition of PC selection, transparent opacity, blue, red, green, black must be separated;There are also modified, such as textile accessories are mostly modified;Such as disc, lamp cap are coated.
2, clean all kinds of PC, and disc lamp holder deplating process, also the same as ABS principle operation.Then dry, after classification, send extruder production.
3, PC some yellow, can produce porcelain white;Transparent still produces transparent;Other colors can be added colorants and material additives.
4, special extruder granulation, but THE PC itself is easy to aging, so it can not be returned for many times, granulation must be careful, cutting packaging.
6. Process flow of recycled polyvinyl chloride (PVC) hard material
PVC hard materials mostly from building materials, steel window doors, electroplating hard plates, chemical plants with plastic valves, plumbing, decorative materials.
1. First, separate the colors.These materials are roughly divided into white, gray, black three kinds.
2. To the shredder, but also with water.Remove the pollution with water cleaning, after drying, to prevent secondary pollution.
3. Mix and mix with the mixer.If it is white material and add a little colorant, according to the need to put additives.
4. Special PVC extruder is used for scraping, cooling and bagging.
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