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TPE+LDPE Stopper Medical Plastic Injection Mold Various Cavities

Designed for mass production of food-grade spice caps, this ultra-durable injection mold combines heavy-duty materials, precision engineering, and food safety compliance to meet the rigorous demands of seasoning packaging. Whether for household spice jars, restaurant bulk containers, or travel-sized seasoning packs, it delivers consistent, defect-free caps with airtight seals, easy dispensing, and long-term mold reliability—ideal for packaging manufacturers aiming to reduce downtime and maximize productivity.
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  • YIXUN mold

  • 8480419090

Product Overview

This specialized injection mold is engineered for manufacturing dual-material (TPE+LDPE) medical stoppers—critical components for sealing vials, syringes, and ampoules in pharmaceutical, clinical, and laboratory settings. By integrating soft, biocompatible TPE (for airtight sealing) with rigid, durable LDPE (for structural support), it produces stoppers that meet strict medical standards (ISO 10993, USP Class VI). The multi-cavity design enables high-volume production, while precision engineering ensures consistent dimensional accuracy and sterility compatibility—ideal for pharmaceutical packaging manufacturers and medical device suppliers.

Core Advantages: Dual-Material Expertise & Medical Compliance

1. Premium Materials for Medical-Grade Performance

  • Mold Base: 304 Stainless Steel – Corrosion-resistant, easy to sterilize, and compatible with medical cleanroom environments; supports 800,000+ injection cycles.

  • Cavity & Core: ASSAB S136 ESR Steel – Vacuum heat-treated to HRC 52-54, offering exceptional wear resistance against TPE/LDPE flow and preventing micro-deformations; polished to Ra 0.01μm for smooth stopper surfaces (avoids drug residue adhesion).

  • Dual-Material Compatibility: Molded with dedicated TPE and LDPE injection ports, plus temperature-controlled flow channels—ensures strong bonding between the two materials (no delamination) and uniform material distribution.

  • Anti-Stick Coatings: PTFE-coated cavity surfaces – Prevents TPE from adhering to the mold during ejection, reducing defects and ensuring clean, burr-free stoppers.

2. Multi-Cavity Design & Precision Engineering

Cavity Layout Options (Customizable for Production Needs)
Cavity Count
Daily Output (8-Hour Shift)
Applicable Stopper Size
Key Advantage
16-Cavity
12,000-15,000 stoppers
8mm-15mm (vial stoppers)
Balances efficiency and precision; ideal for medium-volume production.
32-Cavity
25,000-30,000 stoppers
5mm-12mm (syringe stoppers)
High-volume output; reduces unit cost for mass-market medical products.
64-Cavity
50,000-60,000 stoppers
3mm-8mm (micro-vial stoppers)
Ultra-high efficiency for small-size stoppers (e.g., laboratory reagents).

3. Critical Design Features for Medical Stoppers

  • Sealing Precision: Molded TPE sealing lips with tolerance ±0.02mm – Ensures airtight, leak-proof fit with vial/syringe necks (tested to 0.5MPa air pressure with no leakage).

  • Sterility Compatibility: Smooth, crevice-free cavity design – Eliminates dead corners where bacteria could accumulate; compatible with ETO (ethylene oxide) and gamma sterilization.

  • Dual-Material Bonding: Optimized gate positions and temperature control (TPE: 180-200℃; LDPE: 190-210℃) – Ensures permanent adhesion between TPE and LDPE, preventing material separation during use.

  • Ejection System: Soft-eject pins with rounded tips – Avoids damage to the delicate TPE sealing layer and ensures consistent stopper geometry.

4. Strict Medical-Grade Quality & Compliance

  • Certifications: Complies with ISO 13485 (medical device manufacturing), ISO 10993 (biocompatibility), and USP Class VI (plastic materials for medical use).

  • Material Traceability: Full documentation for mold steel, coatings, and auxiliary components – Meets pharmaceutical regulatory requirements (e.g., FDA 21 CFR Part 820, EU MDR).

  • Rigorous Testing:

  • 72-hour continuous cycle testing with TPE+LDPE materials to verify stability.

  • 100% dimensional inspection via CMM (focus on sealing lip thickness, outer diameter, and TPE-LDPE bonding area).

  • Biocompatibility testing (cytotoxicity, sensitization) for molded stoppers (test reports provided upon request).

Technical Specifications

Parameter
Details
Mold Size
500×400×300mm (16-cavity) ~ 700×550×400mm (64-cavity)
Applicable Injection Machine
Dual-material machines (100-200 tons; with separate TPE/LDPE hoppers)
Cycle Time
25-35 seconds (varies by cavity count: 25s for 16-cavity; 35s for 64-cavity)
Service Life
≥800,000 injection cycles
Dimensional Accuracy
±0.03mm (critical features: sealing lip, outer diameter)
Stopper Compatibility
Vials (5mL-100mL), syringes (1mL-50mL), ampoules (1mL-20mL)
Surface Finish
Mirror polish (Ra 0.01μm) for cavity/core; matte finish for mold base

Customization & Support

  • Tailored Stopper Designs: Accept 2D/3D drawings for custom stopper shapes (e.g., convex, concave, with pull tabs), TPE/LDPE thickness ratios, and logo embossing (for brand identification).

  • Cavity Optimization: Adjust cavity count and layout based on production volume (from 8-cavity small-batch to 64-cavity mass production).

  • Material Adaptation: Modify mold for alternative medical-grade materials (e.g., TPE+PP, TPE+PE) with upgraded temperature control systems.

  • After-Sales Service: 24-month warranty (covers material defects and manufacturing issues); free mold maintenance training and 24/7 technical support (including on-site debugging for cleanroom facilities).

Order Details

  • Lead Time: 35-45 days (standard 16/32-cavity mold); 50-60 days (custom 64-cavity or special-shaped stopper molds).

  • MOQ: 1 set (bulk discounts for 2+ sets; free sample stoppers for qualification testing).

  • Packaging & Delivery: Cleanroom-compatible packaging (anti-static, sterile bags) + heavy-duty wooden crate; FOB Shanghai/Ningbo or door-to-door delivery (with customs clearance support for medical equipment).

Why Choose This TPE+LDPE Medical Stopper Mold?

  • Dual-Material Expertise: Ensures strong TPE-LDPE bonding and consistent stopper performance for medical sealing.

  • Medical Compliance: Meets global pharmaceutical standards, eliminating regulatory risks for end-users.

  • Scalable Production: Multi-cavity options adapt to small-batch R&D or large-volume commercial production.

  • Sterility Assurance: Smooth, crevice-free design and sterilization compatibility ensure safe use with drugs and biologics.

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