CN Mould & Plastic Limited

Name: CN Mould & Plastic Limited
Address: CN High-Tech Park, 227 Xiangshan Road, Shenzhen, 518105, CN
Telephone: +8675586060383

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CN Mould & Plastic Limited

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Contact information, map and directions, contact form, opening hours, services, ratings, photos, videos and announcements from CN Mould & Plastic Limited, Commercial and industrial equipment supplier, CN High-Tech Park, 227 Xiangshan Road, Shenzhen.

22/09/2026

Rubber mold scaling—grey film is zinc sulfide from vulcanization. ⚙️ Reduce ZnO (5→3 phr) or use nano-zinc oxide (0.25 phr). PTFE coatings help; metal coatings don't. Release agents cut cleaning frequency up to 50%, not formation.

https://www.cnmouldplastic.com/why-rubber-molds-scale-and-what-you-can-do-about-it.html

21/09/2026

Custom foam parts with adhesive backing—laminate first, then die-cut. ⚙️ Cleaner edges and consistent placement. Cut-first suits simple, low-volume shapes but risks misalignment.

https://www.cnmouldplastic.com/custom-foam-parts-with-adhesive-backing-cut-first-or-laminate-first.html

20/09/2026

Heat treatment mistakes in mold making—wrong sequence and over-hardening. ⚙️ Correct order: anneal → rough machine → quench & temper → semi-finish → harden → nitride → final grind. Surface-harden only where needed; keep core tough.

https://www.cnmouldplastic.com/heat-treatment-taboos-in-mold-manufacturing-dont-make-these-2-mistakes.html

19/09/2026

Safety visor material selection—PC won for best balance of transparency, moldability, and impact resistance. ⚙️ Compared against PS, PMMA, CA, glass, and PUR. Fracture toughness per unit cost confirmed PC as the top pick. Material choice depends on application, performance, and budget.

https://www.cnmouldplastic.com/how-to-choose-the-right-material-for-a-safety-visor-and-why-pc-won.html

18/09/2026

Textured parts sticking or scratched? Your draft angle is too small. ⚙️ Smoother surfaces need less draft; rougher textures need more. Each 0.025mm texture depth needs 1°–1.5° extra. Fine matte 1°–2°, coarse 3°–5°, leather grain 5°–10°. Balance with part height and material shrinkage.

https://www.cnmouldplastic.com/textured-parts-sticking-or-scratched-your-draft-angle-might-be-the-problem.html

17/09/2026

Rubber shrinkage—hot parts don't match cold specs. ⚙️ Shrinkage varies by compound, geometry, and process. Higher vulcanization temp, flow direction, and thin walls increase it; fillers, hardness, and injection molding reduce it. FKM shrinks most, CR least. Always verify with test shots before cutting steel.

https://www.cnmouldplastic.com/rubber-shrinkage-why-the-hot-part-doesnt-fit-the-cold-mold.html

16/09/2026

Foam in smartphones—not decoration. 📱 Camera, battery, display, speaker, buttons all rely on precision-cut foam for sealing, cushioning, and vibration damping. Tolerances: ±0.5mm packaging, ±0.3mm mid-range, ±0.1mm flagship devices. Mismatches cause assembly stops, seal failures, and returns.

https://www.cnmouldplastic.com/foam-parts-in-smartphones-how-tight-are-the-tolerances-really.html

15/09/2026

Heat treatment problems in molds—quenching cracks, insufficient hardness, deformation, and decarburization. 🔧 Prevent with radii, controlled atmosphere, stress-relief annealing, proper fixturing, and step quenching. Vacuum heating reduces crack risk.

https://www.cnmouldplastic.com/heat-treatment-problems-in-molds-causes-and-countermeasures.html

14/09/2026

Injection machines rarely hit theoretical shot size. ⚙️ Expect 70–90% due to melt density changes and backflow. Apply the injection coefficient α (0.7–0.9; 0.8 typical) for realistic planning. Verify with test shots.

https://www.cnmouldplastic.com/actual-shot-size-vs-theoretical-why-your-injection-machine-never-hits-the-number.html

13/09/2026

Lifter angle—small number, big impact on mold reliability. ⚙️ 3°–5° for smooth sliding (thin rods), 5°–9° sweet spot, 9°–12° use with caution, >12° danger zone. Never exceed 16°. Choose based on core-pull stroke, rod strength, and space.

https://www.cnmouldplastic.com/lifter-angle-one-small-number-that-makes-a-big-difference-in-injection-molding.html

Address

CN High-Tech Park, 227 Xiangshan Road
Shenzhen
518105

Telephone

+8675586060383

Website

https://www.cnmouldplas.com/

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