5 Basic Process Formula Ideas For Extruder PVC Products
Date:2022-5-05 Author:hcscrew
PVC is a white powder with an amorphous structure, with a small branching degree and a relative density of about 1.4. About the melting point of PVC, the glass transition temperature is 77-90℃, and it starts to decompose around 170℃, and it has poor stability to light and heat. Above 100℃ or by a long time of sunlight exposure, it will decompose and produce hydrogen chloride, and further autocatalytic decomposition, causing discoloration and rapid decline in physical and mechanical properties. The process’s basic additive system is usually considered the stabilizer and lubrication design.
The molecular weight of industrially produced PVC is generally in the range of 50,000 to 110,000, with a large polydispersity. Molecular weight increases as the polymerization temperature decrease; no fixed melting point of PVC, starts to soften at 80-85°C, becomes viscoelastic at 130°C, starts to change to a viscous flow state at 160-180°C; has good mechanical properties, the tensile strength of about 60 MPa, the impact strength of 5-10 kJ/m2; has excellent dielectric properties.
In terms of production, PVC used to be the most widely used general-purpose plastic in the world. The conical twin screw barrel of the HUACHEN Screw Barrel for PVC Products Extruder is frequently used in the production of PVC pipes, PVC profiles, PVC buckle wall panels, PVC foam boards, WPC boards, SPC boards, PVC cable sheathing, and other PVC products.
There are some basic formula ideas for PVC extruder products,
1. According to the physical properties and cost requirements, the choice of material components in the PVC formula.
Mainly the choice of modifiers and fillers. Generally for tensile, notch resistance, notch tear, flexibility, and ring stiffness.
2. According to the material components, consider the selection of process aids in the PVC formula.
The stabilizer and lubrication design is widely regarded as the process’s primary additive system. Stabilizers generally only consider the thermal stability and impact on the melt. Lubricant system, melting point, flow, demoulding. Also, consider the dispersion of the review system and the overall impact on the melt.
3. To make a simple decision in the PVC formula, the validity of the raw materials used and the validity of the factory records.
Mainly to prevent counterfeiting, which is also the weakness of many small and medium-sized enterprises. Especially the compound series stabilizer, the compound stabilizer is the main component of the basic process formula. We found when visiting customers’ production situations, 99% of enterprises do not know that they use stabilizer formulations. That is to say, 99% of small and medium-sized enterprises simply do not know the real basic process formula used by their own enterprises! This is also the biggest weakness of the current PVC products extruder operator mechanics.
4. To receive a brief idea of the equipment, the compressive capacity of the extruder screw, the compression ratio, and the guide range.
When customers purchase extruder screws and barrels from us. We should ask if their production of PVC products is heavy calcium or light calcium. Then check whether the original screw structure is a high-calcium screw or a low-calcium screw. Understand the expected required capacity of the customer’s extruder equipment. Understand the die feed resistance, the die bin’s estimated average release ratio, and the effective flat length of the mouth die. If the particles also consider the loss of reprocessing.
5. According to the overall comprehensive consideration, according to the raw material components, consider the stability, fluidity, dispersion, and melt excellence.
Design the initial formulation system based on the equipment and melt out of the mold performance. As well as the initial performance of the product judgment, and make reasonable adjustments to the PVC products formulation.
Quote or contact us at HUACHEN Screw Barrel, to get more ideas about your PVC products formula in extruder processing.
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