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At LEIZHEN, we believe that excellence in manufacturing is not an accident—it's a meticulously engineered process. As specialists in wide-mouth PET preform molds, we have refined a manufacturing workflow that guarantees precision, durability, and performance. This article unveils the key stages of our mold-making process and explains how each step contributes to our superior end product.

Our Step-by-Step Manufacturing Workflow

1. Collaborative Design & DFM Analysis
The journey begins with your concept. Our engineers work alongside your team to translate packaging requirements into a functional mold design. Using advanced 3D CAD software, we create detailed models. Crucially, we perform a thorough Design for Manufacturability (DFM) analysis specific to wide-mouth applications. This stage focuses on optimizing gate design, cooling channels, and venting to prevent defects and ensure efficient material flow for thicker preform walls, setting the foundation for a high-yield production mold.

2. Precision Machining of Core & Cavity
This is where our craftsmanship shines. The mold design is transferred to our state-of-the-art CNC machining centers. We use premium hardened steels (like H13) to mill the core and cavity blocks with micron-level accuracy. For complex geometries and critical neck finish details of wide-mouth preforms, we employ precision EDM (Electrical Discharge Machining) processes. This ensures perfect thread forms and sealing surfaces that are crucial for jar closures.

3. Advanced Cooling Channel Implementation
Cycle time is king in injection molding. For wide-mouth preforms, which have more material, efficient cooling is paramount. We drill and manufacture conformal cooling channels that follow the contour of the preform shape as closely as possible. This proprietary approach ensures rapid and uniform heat extraction, dramatically reducing cycle times and improving preform crystallinity and consistency.

4. Meticulous Assembly & Integration
Every component—from hot runner systems (selected from top brands like Yudo or Mold Masters) to ejector pins and alignment guides—is assembled by our master technicians. Each part is fitted, checked, and lubricated to ensure flawless interaction. The integration of the hot runner system is particularly critical for maintaining consistent melt temperature and preventing material degradation in the larger gate areas of wide-mouth designs.

5. Rigorous Testing & Validation
Before shipment, every LEIZHEN mold undergoes a rigorous validation process. We perform trial runs in our facility using production-equivalent injection molding machines. We produce sample preforms, which are then measured with CMMs, checked for weight consistency, and tested for dimensions and wall thickness distribution. This allows us to fine-tune the process and ensure the mold performs perfectly, meeting all specifications before it reaches your production floor.

6. Comprehensive Documentation & Support
We deliver more than a mold; we deliver a complete package. This includes detailed technical drawings, maintenance manuals, and optimal process parameters. Our support continues after delivery with troubleshooting assistance and readily available spare parts, ensuring your production longevity.

Why LEIZHEN's Process Delivers Superior Wide-Mouth Molds

Our entire manufacturing process is optimized for the unique challenges of wide-mouth jar preform molds:

• Expertise in Thick-Wall Design: Our process prioritizes uniform filling and cooling for the heavier sections of wide-mouth preforms, preventing sinks and voids.

• Focus on Critical Closure Features: The machining and polishing of thread and sealing surfaces are given extreme attention, ensuring leak-proof jars and easy capping.

• Built for Durability: Using premium materials and precise heat treatment in our process results in molds that withstand the high injection pressures and abrasive nature of PET over millions of cycles.

Partner with LEIZHEN to benefit from a transparent, precise, and reliable mold manufacturing process designed for high-performance results.

Contact us today to start your project with a trusted leader in precision mold making.