PVC Overmolding
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Polyvinyl chloride, commonly referred to as PVC, is a thermoplastic material that is extensively utilized. This material is recognized for its strength, excellent flammability, chemical resistance, and abrasion resistance. Furthermore, PVC possesses strong dielectric properties, outstanding weather resistance and impact resistance, as well as good dimensional stability. Its tensile strength is approximately 6500 psi.
PVC thermosensitive plastic overmolding is an excellent choice for various applications because it can be used with all types of hardness testers, including both soft and hard flexible stiffness. Due to their outstanding dimensional stability, PVC of all types and grades are ideal for use in injection molding processes.
Attention Points of PVC Overmolding
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Mold: In the PVC Overmolding process, materials that can withstand corrosion and high temperatures will be employed. Alternatively, the surface of the mold will undergo treatment with chrome plating and nitriding. It is essential to regularly clean the mold's surface during mass production, and maintenance must be carried out subsequently.
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Materials: Prior to manufacturing and processing, raw materials must undergo a hot air drying process for a duration of two hours, with a requisite temperature of 80°C. This is necessary because the materials cannot be stored effectively because of the moisture.
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Equipment: It is essential to establish a separate injection molding machine during PVC manufacturing and processing to prevent material retention and heat decomposition.
Molding Method And Products for PVC Overmolding
Extrusion molding and products
PVC extruded products can be categorized into two types: soft goods and hard goods. Soft products are typically made from high-molecular weight PVC resin and can be easily molded using a single screw extruder. Another category is hard goods, which can be produced using either a single or twin screw extruder and are typically made from PVC resin with a relatively low molecular weight. Examples of hard goods include hard tubes, hard plates, and hard profiles.
Injection molding and products
Injection molding requires more liquid, making the process more challenging. The majority of UPVC products employ PVC resin with a comparatively low molecular weight in order to decrease the molding processing temperature. Injection molding products can be divided into two main categories: shoe and pipe fittings.
Calendaring molding and products
The main end product of the rolling forming process is SPVC calendered film. Medical devices such as blood transfusion bags and infusion bags are made from PVC resin and non-toxic additives in the form of rolled films.
Advantages of
PVC Overmolding
Materials that are not conductors are not corroded or electrolyzed by electricity.
Simple to install and affordable products.
It is both combustible and incapable of burning.
Low resistance, rapid flow, a smooth interior surface, and easy maintenance.
Tough, able to withstand the elements, and challenging for microbes to contaminate.
Simple processing method, easy injection molding.
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