Production process of pvc profile plastic extrusions
Squeeze forming refers to the method of continuously extruding plastic materials through spiral extrusion.
Squeeze the melted material from the barrel to the head of the machine, and shape it into a mold like blank through the head mold.
During the cold mold forming process, the dragging equipment continuously extracts the formed product from the mold to obtain the desired product.
In order to obtain profiles with good appearance and internal quality, it is necessary to strictly control the extrusion process and strictly control it.
The focus is on the mixture, molding temperature, screw cooling and rotation speed, extrusion pressure, cooling and shaping, etc.
Mixing
The mixing process first adds PVC resin and ingredient ratio to the hot mixer, and then stir at high speed.
The stirring temperature is 120 ℃. After stirring evenly, place it in a cold mixer and stir at around 45 ℃.
Loose and easily flowing powder mixture, remove and set aside. Temperature control is crucial during the mixing process.
If it is high, the material is prone to sticking, clumping, and uneven plasticization.
This is a great goal. Therefore, usually, the end temperature of high-temperature stirring is (115-120) ℃, and the stirring time is longer.
After 10 to 15 minutes, the discharge point of the cold mix is 45 ℃.
Extrusion forming temperature
The pvc profile plastic extrusions produced by our company are twin screw extruders with exhaust function.
Through processes such as preheating, feeding, conveying, exhaust, and melting, the material is uniformly plasticized and shaped before entering the machine.
Further uniformity is achieved behind the head, and under the pressure of the head, it is extruded into a dense billet, which flows continuously in a flowing state.
The extrusion forming temperature plays an important role in the plasticization and melting flow of plastics.
The quality and output of finished material plasticization and pvc profile plastic extrusions products are closely related.
Due to the close proximity between the process temperature and decomposition temperature of PVC, strict control is necessary.
In general, the temperature control of an extruder is mainly achieved by controlling the temperature from the feed section of the barrel to the extrusion section, in order to separate the material from the solid state.
The powder or particles gradually melt, resulting in better plasticity of the material. According to the extrusion process requirements, the temperature of each section should be carried out according to the extrusion process.
Determine based on the characteristics of the machine, the processing characteristics of the material formula, and the quality requirements of the product. Extrusion forming temperature
It generally refers to the melting temperature of plastic, which is mainly determined by the temperature of the barrel and screw.
Testing and control are simple, generally using the casing temperature to approximate the melting temperature, and using thermocouples for control. In use
When twin-screw extrusion is used, the temperature of the feeding section is higher than the melting temperature of the resin. The feeding section, compression section
In the exhaust and homogenization regions, the temperature field generally exhibits a saddle shaped characteristic.
The nozzle temperature has a significant impact on extrusion molding. The head temperature should be maintained within an appropriate temperature range.
It can achieve good appearance and mechanical properties, reducing the expansion of the melt outlet.
Get a Custom Extruded plastic Quote Today!
tel:+86-13532547483
wechat:13532547483
email:ken@euson.cn
skype:live:.cid.b7535cb602223e9b
address:Guangdong Province, Dongguan city, China
Hot Tags: pvc profile plastic extrusions, China, suppliers, manufacturers, factory, customized, buy, made in China
