PVC Injection Molding
Durable, flexible, and cost-effective—PVC injection molding is ideal for producing high-performance plastic parts.
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PVC (Polyvinyl Chloride) injection molding is a manufacturing process used to produce durable, chemically resistant, and cost-effective plastic parts. With excellent flexibility, impact strength, and weather resistance, PVC is widely used in industries such as construction, medical, automotive, and consumer goods. Due to its heat sensitivity, precise processing conditions and specialized equipment are required to ensure optimal results.
- Material Expertise: Proper formulation control to enhance heat resistance, flexibility, or durability.
- Precision Molding: Tight tolerances and smooth surface finishes for complex parts.
- Insert & Overmolding: Integration with metal or other plastics for multi-material components.
- High & Low Volume Production: Scalable solutions to meet different manufacturing demands.
- Post-Molding Services: Secondary processing, assembly, and custom packaging options.
What is PVC Injection Material?
Polyvinyl Chloride (PVC) is a thermoplastic polymer known for its excellent durability, chemical resistance, and cost-effectiveness. Composed of vinyl chloride monomers, PVC is unique in its ability to be rigid or flexible, depending on the formulation and additives used. It exhibits strong resistance to moisture, corrosion, and UV exposure, making it ideal for both indoor and outdoor applications. Additionally, PVC has inherent flame-retardant properties due to its high chlorine content, further enhancing its suitability for electrical and construction applications.
Types of PVC
- Rigid PVC (RPVC) – High-strength, impact-resistant, used in pipes, fittings, and structural components.
- Flexible PVC (FPVC) – Enhanced with plasticizers for flexibility, found in medical tubing, cables, and seals.
- CPVC (Chlorinated PVC) – Improved heat resistance, ideal for hot water pipes and industrial applications.
- UPVC (Unplasticized PVC) – No plasticizers, offering superior rigidity and weather resistance, often used in window frames and doors.
PVC Injection Molding Design Guide
Designing PVC injection molded parts requires consideration of the material's properties, including its flow behavior, shrinkage rate, and thermal sensitivity. Following are the key design guidelines.
| Item | Description |
|---|---|
| Wall Thickness | Maintain uniform wall thickness (typically 2.0–4.0 mm) to prevent warping and ensure even cooling. Avoid sudden transitions that may cause stress concentrations. |
| Draft Angles | Apply at least 1.5°–2.0° of draft to facilitate easy ejection from the mold, reducing the risk of surface defects. |
| Ribs and Reinforcements | Use ribs instead of thick walls to improve strength without excessive material use. Keep rib thickness at 50–60% of the main wall thickness to prevent sink marks. |
| Rib and Boss Design | Ribs should be 50–60% of the main wall thickness to avoid sink marks. Bosses should have generous fillets to reduce stress. |
| Fillets and Corners | Sharp corners can lead to stress concentration and weak points. Use fillets with a minimum radius of 0.5× the wall thickness to improve part durability. |
| Shrinkage Compensation | PVC has a low shrinkage rate (0.2%–0.5%) compare to other plastics, but proper mold design should account for this to maintain dimensional accuracy. |
Advantages of PVC Plastic Moulding
Application of Molded PVC Products
Construction & Building
- Electrical conduit fittings
- Pipe fittings
- Window and door profiles
- Roofing membranes
- Wall panels
Electronics & Electrical
- Cable insulation and connectors
- Switch housings
- Battery cases
- Electrical enclosures
Consumer Goods
- Tool handles
- Storage containers
- Plumbing accessories
- Toys and figurines
- Furniture fittings
Medical & Healthcare
- IV connectors
- Catheter components
- Blood collection tubes
- Respiratory masks
- Medical housings
