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PVC Compounding Line

PVC compounding line is the core equipment for recycling and processing of polyvinyl chloride (PVC) plastics. It converts PVC resin, additives and recycled waste into reusable granular raw materials through physical processing and is widely used in various links of the plastic industry chain.

ParameterS

Models of PVC compounding line:

Model	Extruder model	Motor power (kw)	Capacity(kg/h)	Cooling stage
PZL-51	SJSZ51	18	90	1
PZL-55	SJSZ55	22	125	2
PZL-65	SJSZ65	37	200	3
PZL-80	SJSZ80	55	400	3
PZL-92	SJSZ92	110	600	3

PVC compounding line has the following characteristics:

High-efficiency plasticization

– The screw for the PVC compounding line has a unique design and good conveying and plasticizing capabilities, which can make the PVC raw materials achieve uniform plasticization in a shorter time and improve production efficiency. For example, the meshing screw of the twin-screw granulator can produce strong shearing and mixing effects, and even highly filled or difficult-to-process PVC materials can achieve efficient plasticization.
– The barrel for the PVC compounding line is equipped with a precise heating and cooling system, which can accurately control the temperature according to different PVC raw materials and production process requirements to ensure the quality of plasticization.

Uniform mixing

– Some PVC compounding line screws are equipped with special mixing elements, such as kneading blocks, reverse threads, etc., which can fully mix PVC resin with various additives, such as plasticizers, stabilizers, fillers, etc., to ensure the consistency of product performance.
– For PVC formulas that require the addition of multiple different ingredients, the PVC compounding line can achieve uniform dispersion of each component at the microscopic level, thereby improving the stability of product quality.

Strong adaptability

– The PVC compounding line can adapt to PVC raw materials of different types and performance requirements by adjusting the screw combination, process parameters, etc., including general-purpose PVC, high-impact PVC, heat-resistant PVC, etc.

– The PVC compounding line can not only process new PVC resin raw materials, but also regenerate and granulate recycled waste PVC to achieve the recycling of resources.

High degree of automation

– Equipped with advanced control systems, PVC compounding line can realize real-time monitoring and automatic adjustment of key parameters such as temperature, speed, and pressure. The operator only needs to set the parameters on the control panel, and the equipment can run stably according to the preset program.

– It has fault diagnosis and alarm functions. When the equipment is abnormal, it can stop in time and prompt fault information, which is convenient for maintenance personnel to quickly troubleshoot and reduce downtime.

Energy saving and environmental protection

– The use of efficient heating technology, such as electromagnetic heating, has higher thermal efficiency than traditional resistance heating methods, and can save 20%-30% of energy.

– Some new PVC compounding line have optimized the screw structure and transmission system in design, reduced the energy consumption of the equipment during operation, and improved production efficiency, achieving the unity of energy saving and high efficiency.

The production process of the PVC compounding line mainly includes the following steps:

Raw material preparation

PVC resin, plasticizer, stabilizer, filler, etc. are mixed evenly in a certain proportion to make a mixture that meets the production requirements. For example, when producing soft PVC particles, the amount of plasticizer added will be relatively large; while when producing hard PVC particles, the amount of plasticizer will be reduced and the proportion of stabilizer and filler will be increased.

Feeding

The mixture is added to the hopper of the PVC compounding line through an automatic feeder or manually. The automatic feeder can improve the feeding efficiency and ensure the continuity and stability of the feeding.

Plasticizing extrusion

After the mixture in the hopper enters the barrel, it gradually heats up, softens, and melts and plasticizes under the combined action of the shear force, friction force, and external heating generated by the rotation of the screw. Different sections of the screw have different functions, such as the feeding section is responsible for conveying the material, the compression section compresses and preliminarily plasticizes the material, and the metering section ensures that the material is extruded evenly and stably. The molten PVC material is pushed to the die head by the screw.

Cooling and shaping

The PVC material extruded from the die head is in strip shape and is cooled and shaped by air cooling or water cooling. Air cooling uses the cold air blown by the fan to cool the material, while water cooling cools the material through a water tank. Water cooling has a faster cooling speed, but it is necessary to control the cooling water temperature to prevent defects on the surface of the material.

Pelletizing

The cooled PVC strip material enters the pelletizer and is cut into pellets of a certain length by a rotating cutter. There are two types of pelletizing: hot cutting and cold cutting. Hot cutting is cutting before the material is completely cooled after extrusion, which is suitable for soft PVC; cold cutting is cutting after the material is completely cooled, which is often used for hard PVC.

Screening and packaging

The cut PVC pellets are screened by a vibrating screen to separate the pellets that do not meet the particle size requirements and return them for reprocessing. Qualified pellets are packaged by a packaging machine for storage and transportation.

When using the PVC compounding line, there are the following precautions:

Before starting

– Check the equipment: Check whether all parts are normal, including whether the screw and barrel are worn, whether the transmission system, heating and cooling system and control system are running well, and whether the connection parts are loose.

– Clean the barrel and screw: Make sure there is no debris or residual material inside to prevent mixing into the new material and affecting the product quality.

– Prepare raw materials: Accurately proportion the raw materials according to the process requirements, check the quality of the raw materials, and ensure that there are no impurities, excessive moisture and other problems.

Starting and running

– Preheating and heating: Slowly heat the barrel according to the set heating curve, and keep the temperature constant for a period of time after reaching the process requirement, so that the material can be plasticized evenly, avoiding damage to the equipment or affecting the product quality due to too fast heating.

– Startup sequence: Start the screw at a low speed first, then add a small amount of material. After the material is extruded smoothly, gradually adjust the screw speed and feeding amount to achieve normal production status.

– Monitoring parameters: Pay close attention to the changes in parameters such as temperature, pressure, and speed to ensure that they are within the specified range of the process. If the parameters are abnormal, analyze the reasons and adjust them in time. For example, if the pressure increases due to changes in raw materials, the screw speed or raw material formula needs to be adjusted.

– Adding materials: Keep the material supply continuous and uniform to avoid material interruption or uneven feeding, which will affect the plasticization and extrusion effect. At the same time, prevent foreign matter such as metal from mixing into the material and damaging the screw and barrel.

After shutdown

– Cleaning the equipment: First squeeze out the remaining material in the barrel, then use a special cleaning agent or shutdown material to clean the screw and barrel to prevent the residual material from deteriorating and affecting the next production.

– Turn off the power supply and system: Turn off the power supply of the heating system, motor, etc., turn off the cooling water circuit and compressed air system, and do a good job of equipment maintenance, such as regularly adding lubricating oil to the transmission parts.

– Safety protection: When the PVC compounding line is running, it is strictly forbidden to open the protective door or put your hand into the running parts to prevent accidental injuries. At the same time, regularly check the safety devices of the equipment to ensure that they are reliable and effective.

Unit specifications of PVC Compounding Line

SJ Series Rigid Plastic Single Screw Pelletizing Line

The SJ Series Rigid Plastic Single Screw Pelletizing Line is suitable for PP, PE, ABS, PC, PS flakes and scraps pelletizing. The extruder uses the high efficiency screw barrel to ensure the plasticizing effect and high output of the finished product. The forced vacuum exhaust system effectively removes low molecular impurities, moisture and ink. According to the contamination of material and customers’ habits, the variety of screen changers are available: plate screen changer, column screen changer and automatic screen changer. For different purposes, the variety of screw L/D ratio, two stage extrusion system and pelletizing method are available.

PE Pelletizing Machine

Parallel twin screw PE pelletizing machine is the core equipment for recycling and processing of PE plastics. It converts PE recycling pellets, wood powder, CACO3 and some additives into reusable granular raw materials through physical processing and is widely used in various links of the plastic industry chain, especially PE-based wpc decking floor production.

Company Profile:

Zhangjiagang Sharc Machine Co., Ltd. is a professional company with outstanding achievements in the field of plastic machinery.

Since its establishment, we have been committed to the research and development, production and sales of plastic machinery.We have an experienced and innovative R&D team who keep up with the cutting-edge trends of international plastic processing technology and continue to study to ensure that our equipment remains technologically advanced.

Over the years, we have accumulated rich experience and a good reputation in the plastic machinery industry. Whether it is a large-scale
plastic processing enterprise or a small and medium-sized manufacturer, we have won their trust and long-term cooperation with high-quality
products and services. We will continue to uphold the concept of professionalism, innovation and service, contribute our own strength to
the development of the plastic machinery industry, and work hand in hand with customers to create brilliance together.

SHARC — Leading innovation and shaping the future

ZHANGJIAGANG SHARC MACHINE CO., LTD. is located in Jiangsu Province of china.

We have more than 20 years’ experience of manufacturing plastic machinery, including: automatic material mixing&feeding system, plastic profiles extrusion line, plastic sheet production line, plastic pipe production line, plastic panel&board extrusion line, plastic recycling&pelletizing machine, surface treatment machines and other auxiliary machines.