Multiple Cavity Plastic Mold for Screw Neck Bottle Closure with Thread PP Material

Product Detail Page: Multiple Cavity Plastic Injection Mold for PP Screw Neck Bottle Closure

(Precision Molds for High-Volume Bottle Cap Production)

Service Overview

We specialize in custom multiple cavity injection mold design and manufacturing for PP (Polypropylene) screw neck bottle closures—engineered to deliver high-precision, cost-effective production of threaded bottle caps for food, beverage, pharmaceutical, and cosmetic industries. Our molds support 4-32 cavity configurations, ensuring consistent thread accuracy, fast cycle times, and seamless compatibility with standard bottle neck finishes (e.g., 28mm, 32mm, 43mm).

Core Mold Features for PP Screw Neck Closures

1. Multiple Cavity Design (4-32 Cavities)

• Optimized for small-to-medium PP closures (diameter: 15-60mm, height: 10-30mm):

• Reduces per-unit production cost by 35-50% vs. single-cavity molds.

• Balanced cavity layout with equal flow paths—ensures uniform wall thickness (±0.03mm) and thread precision across all cavities.

• Customizable cavity count based on your production volume (ideal for 100k+ units/month).

1. Precision Thread Engineering

• Thread molding: Integrates collapsible core or unscrewing mechanism (for internal/external threads) to avoid thread damage during demolding.

• Thread accuracy: Complies with ISO standards (thread pitch tolerance ±0.01mm) for tight sealing with bottle necks (leak-proof performance verified via pressure testing).

• Compatibility with standard neck finishes: 20/410, 24/410, 28/410, 32/415, and custom neck sizes.

1. PP Material Optimization

• Molded for medical/food-grade PP (FDA 21 CFR Part 177.1520, ISO 10993 compliant):

• Features optimized cooling channels (conformal to closure shape) to reduce cycle time to 15-25 seconds (vs. industry average 25-35s).

• Anti-stick surface treatment (Ra 0.02μm) on mold cores/cavities—prevents PP adhesion and ensures clean part release.

1. Durable Mold Construction

• Mold base: High-strength S50C steel (corrosion-resistant, shock-proof).

• Cavity/core: H13 tool steel or P20 steel (heat-treated to HRC 50-55) for long service life (1M+ shots).

• Hot runner system (optional): Uses medical-grade hot runner nozzles (e.g., Mold-Master, Husky) to minimize PP material waste (≤2% scrap rate).

Service Process (End-to-End Support)

1. DFM (Design for Manufacturability) Analysis

• Our engineering team reviews your closure 3D model (STEP/IGS) to optimize:

• Thread profile (ensures compatibility with bottle necks).

• Gate location (submarine or pin gate to avoid visible marks on closures).

• Venting system (prevents air traps in thread roots).

1. Mold Fabrication

• High-precision machining: 5-axis CNC milling, wire EDM, and spark erosion for cavity/core details.

• Assembly & dry testing: Verifies mold alignment, thread mechanism functionality, and cooling efficiency.

1. Sample Validation

• Provides 50-200 PP closure samples for:

• Dimensional inspection (thread pitch, outer diameter, height).

• Leak testing (1.2MPa pressure for 30 seconds).

• Compatibility testing with your bottle necks.

1. Mass Production Support

• Assists with injection machine parameter tuning (temperature: 180-220℃, injection pressure: 80-120MPa).

• Offers mold maintenance services (cleaning, component replacement, and reconditioning) to extend mold lifespan.

Technical Specifications

Why Choose Our Mold Service?

• Thread Precision: 10+ years of experience in molding threaded closures—zero thread defects in mass production.

• Cost Efficiency: Multiple cavities + optimized cycle times reduce production costs for high-volume orders.

• Customization: Supports unique closure designs (e.g., tamper-evident rings, flip-top mechanisms) and neck sizes.

• Traceability: Full documentation (material certificates, machining logs, and sample test reports) for quality control.