Plastic extruded profiled product production method
Squeezing is the method of spiral extrusion used to continually extrude plastic material.
Form the molten material into a billet-like form by forcing it through the machine head mold after it has been squeezed from the barrel.
The dragging device constantly removes the formed product from the mold during the cold forming process in order to produce the desired output.
Strict control and oversight of the extrusion process are required to produce profiles with acceptable pvc plastic extruded trim external appearance and internal quality.
The mixture, molding temperature, screw speed and cooling, extrusion pressure, cooling and shaping, etc. are important factors.
PVC resin and the ingredient ratio are added to the heated mixer first in the mixing process, and then blends quickly.
120 °C is the stirring temperature. It is added to a cold mixer and swirled at around 45 °C after being uniformly stirred.
Take off the powder mixture for later use; it’s loose and flows easily. Maintaining control over the temperature is essential during mixing.
The material is more likely to adhere, clump, and undergo uneven plasticization if it is high.
That’s a fantastic goal. As a result, the ultimate temperature of high-temperature stirring is often between 115 and 120 °C, and the stirring period is somewhat lengthy.
The cold mix’s discharge point is 45 °C after ten to fifteen minutes.
The plasticization and melt flow of plastics are significantly influenced by the temperature at which extrusion forms.
pvc plastic extruded trim and raw material plasticization output quality are directly related to each other.
Temperatures of the cylinder and mold
Strict control is required since the PVC decomposition temperature and process temperature are fairly similar.
To extract the material from the solid phase condition, the temperature control of the extruder is often accomplished by regulating the temperature from the material cylinder’s feed section to the extrusion section.
To improve the material’s plasticity, the powder or particles slowly melt. Temperature adjustments for each section should be made in accordance with the extrusion process requirements.
It is decided by looking at the machine’s specs, the material processing properties of the recipe, and the product’s quality standards. Temperature at which extrusion forms generally refers to the temperature at which plastic melts, which is mostly influenced by the barrel and screw temperatures.
Thermocouples are used for basic testing and control, which typically involves estimating the melting temperature from the casing temperature. In use right now
The feeding section temperature during twin-screw extrusion is higher than the resin melting temperature. The sections for feeding and compression
The temperature field typically has a saddle-shaped feature in the exhaust and homogenization areas.
Extrusion molding is significantly impacted by the nozzle temperature. It is important to keep the head temperature within a suitable range.
It is possible to achieve improved mechanical and aesthetic qualities while limiting the melt outlet’s expansion.
The cylinder’s temperature
170-180 °C is the extrusion temperature
The formula indicates that PVC material is prone to cracking and has a high melting point.
The front punch mold has a maximum temperature range of 190–210 °C.
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