Reuse of waste plastics Plastic Recycling Machinery recycling is the key to the recovery and regeneration, regeneration is melting. Melt regeneration technology is divided into simple and complex regeneration regeneration. Simple regeneration for plastic production process of leftover bits and pieces, the waste plastics variety onefold, less pollution, generally through simple treatment can be directly processed into granular material or sheet material. Compound regeneration is aimed at current consumption, recycling of waste plastics, after sorting, pretreatment, selecting grain, forming regeneration.
One, pretreatment
Preprocessing consists of sorting, crushing, washing and drying.
① withPlastic Shredder to crush
For larger parts of the plastic waste in the granulation should be crushed to fine crushing. Can be selected according to requirements of different models and the function of the crushing equipment.
The cleaning and drying
The pollution is not serious and the structure is complex and large waste plastic, to be taken before cleaning, after crushing technology. First with detergent water immersion, to remove some of the adhesive and the oil stains, then rinse with water, after cleaning out to dry.
The pollution of waste plastics, should be first rough washing, removing foreign matter such as sand, stone and metal, to prevent damage to the crusher. Waste plastics by rough after washing, centrifugal dewatering, then enters the crusher. After the break and then further refined washing, to remove the bag in which the debris. After cleaning, drying, so that the next melt granulation.
Cleaning technology in our country at present still adopt manual cleaning and mechanical cleaning two methods. Manual cleaning of low work efficiency, we should vigorously develop mechanical cleaning. Its working principle is to be cleaned waste plastics in damp washing fluid, if it is contaminated with oil products, with appropriate concentration of lye can be effective. Soak for several hours, and then mechanical agitation, through mutual friction and impact can remove the impurity and dirt.
In two, prior to molding processing renewable materials
Recycling of waste plastics plastic recycle machine through a series of processing to obtain dry powder, or direct the plasticized molding, or by granulation and forming. Prior to this, often need to join all kinds of ingredients, complexing agent, stabilizer, lubricant, such as coloring agents, plasticizers, fillers and various types of the agents.
Waste plastics generally have different degrees of aging, in order to ensure that the recycled plastic products stable performance, should join the stabilizer. Such as thermal stabilizer, UV stabilizer. In the use of stabilizers should pay attention to its toxicity and pollution of. Such as Recycled PVC ( PVC ) of basic lead class has a certain toxicity, not making and food contact plastic products; elastic stabilizer in 4010 deep color, not making light products. PVC renewable materials can be selected with the basic lead type, fatty soap, composite stabilizer; polyethylene ( PE ), polypropylene ( PP ) renewable materials available 1010 stabilizer.
Waste plastics often has a certain degree of pollution, so it is often used in dark colorant, such as carbon black, iron oxide red, plastic palm.
The lubricant is also recycled material essential auxiliaries. Regeneration of polyvinyl chloride ( PVC ) material in the presence of polar lubricant than polar lubricant effect is good, as in the use of chlorinated paraffin wax than the common good, whereas for polypropylene ( PP ), polystyrene ( PS ), polyethylene ( PE ) renewable materials with ordinary paraffin.
Recovery of polyvinyl chloride ( PVC ) material often require plasticizer. Since the original plastic products of small molecular plasticizer easy WIP in migration phenomenon, so the regeneration of polyvinyl chloride ( PVC ) products need to add some amount of plasticizer, optic products required hardness and. In addition, if the amount of soft polyvinyl chloride ( PVC ) recovery items and rigid polyvinyl chloride ( PVC ) recycling materials mixing, can reduce or eliminate the use of plasticizers.