Texin — Practical, shop‑proven PVC material injection molding products

At Texin we know PVC isn’t a “plug‑and‑play” plastic. PVC material injection molding products require tight control, corrosion‑aware tooling, and design choices that reduce stress and defects. Rigid PVC (RPVC) and flexible PVC (FPVC) are both valuable in building, medical, automotive and consumer parts — but they demand different handling. We build tooling and processes to meet those demands so your parts are consistent from first shot to production.

What we focus on

• Controlled processing window: keep melt temperature between 170–190°C and avoid long residence times to prevent degradation and HCl release.
• Dry, clean feedstock: pre‑dry PVC at 60°C for 2–3 hours to avoid bubbles and voids.
• Corrosion resistance: tool in H13 or S136 steels or chrome plate cavities; protect barrels/nozzles and maintain equipment.
• Robust mold design: adequate vents, conformal or well‑placed cooling, uniform wall sections, and suitable draft and fillets.
  These practices are the backbone of our PVC material injection molding products.

Common, specific questions (and straight answers) 

Q — How sensitive is PVC to temperature?
A — Very. The correct melt window is 170–190°C. Overheating or long residence in the barrel causes thermal degradation and HCl generation, which leads to discoloration and can corrode tooling.

Q — Do I need to dry PVC resin?
A — Yes. Moisture causes bubbles and voids. We recommend pre‑drying at 60°C for 2–3 hours before molding.

Q — What pressures and machine settings work best?
A — Because PVC melt is relatively viscous, injection pressure is high: about 80–120 MPa is common. Back pressure of 3–10 bar (50–150 psi) and screw speeds of 20–60 RPM help achieve uniform plasticizing without excessive shear heating.

Q — What mold materials should I insist on?
A — Use corrosion‑resistant steels such as H13 or S136, or consider chrome plating. PVC can release acidic gases; these materials extend mold life and reduce maintenance.

Design and tooling rules we always recommend

• Wall thickness: keep sections as uniform as possible to reduce warp and internal stress.
• Draft: include 1°–2° draft on vertical faces to ease ejection and reduce tool wear.
• Fillets: avoid sharp corners; add radii to improve flow and lower stress concentrations.
• Holes: keep depth/diameter ≤ 2:1 to avoid filling problems and sink marks.
• Venting: design vents for full cavity evacuation — insufficient venting causes burn marks (the “Diesel effect”).

Troubleshooting — quick fixes with numbers

• Burn marks / Diesel effect: Cause — trapped gas or over‑fast fill. Fix — reduce injection speed and improve venting.
• Bubbles / voids: Cause — moisture in resin. Fix — pre‑dry at 60°C for 2–3 hours and check hopper seals.
• Warpage / distortion: Cause — uneven cooling or non‑uniform walls. Fix — redesign for uniform wall thickness and rebalance cooling; consider conformal cooling channels.
• Discoloration: Cause — melt overheating or long barrel residence. Fix — keep melt at 170–190°C and shorten residence time.

Production practices that save money and time

• Use a reciprocating screw machine and set back‑pressure to 3–10 bar and screw speed to 20–60 RPM for stable plasticizing.
• Minimize material dwell in the barrel — schedule shot sequences and purge strategy so PVC does not sit long at temperature.
• Maintain tooling: regular inspection, quick cleaning of vents and gates, and corrosion‑aware lubrication prevent unplanned downtime.
  These steps reduce scrap, tool repair, and rework for PVC material injection molding products.

Why customers choose Texin：

We combine real shop floor experience with material‑aware engineering. That means we don’t just quote temperatures and pressures — we build tooling in the right steels, design venting and cooling for your part, and scale process windows for production. If your part must meet dimensional tolerances, cosmetic appearance, and chemical resistance, our approach to PVC material injection molding products minimizes the common failure modes from the start.

Summary：

PVC can do a lot — chemical resistance, flame retardancy and durability — but it pays to respect the material. Simple controls (pre‑dry at 60°C for 2–3 hours, melt 170–190°C, injection pressure 80–120 MPa, back‑pressure 3–10 bar, screw 20–60 RPM) plus corrosion‑resistant tooling and good venting go a long way toward first‑shot success. Texin builds those controls into every project producing PVC material injection molding products.

Want Texin to review a part? Send your drawing, target tolerances, and intended environment. We’ll provide a feasibility review and practical recommendations tailored for PVC material injection molding products and for your production goals.

● Many years of mold design, development and manufacturing experience

● Pursue excellence and cast high quality

● High quality, high efficiency and high precision

● Take the initiative to provide timely, fast and dynamic customer service