Thermos Cup Lid Plastic Injection Mold #2

Core Advantages

• FoodContact Grade Safety Assurance: The mold design and material selection fully consider the safety requirements of food contact applications. The cavity is made of corrosion-resistant mold steel, ensuring that parts comply with FDA/LFGB and other food contact material regulations.
• Sealing Structure Molding Capability: Proficient in machining precision sealing grooves and multiple sealing structures. High-precision insert design ensures the flatness of the sealing surface and the tolerance of the groove width, thus guaranteeing the sealing performance of the cover.
• Hinge life guarantee: For the one-piece movable hinge structure, the gate position and weld line direction are optimized through mold flow analysis to ensure correct molecular orientation at the hinge, allowing it to withstand repeated bending without breakage.
• Multicomponent fit precision: Key dimensions of the cover components are maintained within the IT8IT10 tolerance range, ensuring smooth threaded connection between the top cover and the base, and precise alignment of the drinking spout.

Product Features

• Precision thread structure: The mold uses a rotary unscrewing or forced ejection mechanism to form the threads between the cover and the main body, ensuring a complete thread profile and smooth fit.
• Sealing groove forming precision: The mold inserts in the sealing groove area are machined with high precision, with width and depth tolerances controlled within ±0.02mm, ensuring the specified sealing compression is achieved.
• Moving hinge forming: For PP or PE onepiece movable hinges, the gate position is optimized to guide the melt flow along the hinge axis, ensuring longterm bending life.
• Optimized Cooling System: Conformal cooling channels are designed according to the part wall thickness to effectively control the molding cycle and minimize warpage and internal stress.
• Replaceable Wear Parts: Critical molding inserts in highwear areas (such as thread forming areas and sealing grooves) feature a removable design for easy maintenance and reduced longterm costs.

Application Areas

This mold is primarily used in the daily necessities and home appliance industries to produce lid assemblies for various thermos flasks, travel mugs, and coffee cups. It is suitable for various applications, including home, office, outdoor, and automotive, providing products for vacuum container brands and plastic product manufacturers.

Common Problems and Solutions

• Problem: The lid threads are too tight or too loose when engaging with the bottle body.
• Solution: Strictly control the machining accuracy of the thread core/cavity; check if the ejection mechanism is causing thread deformation; optimize shrinkage settings through mold flow analysis.
• Problem: Leakage occurs during lid sealing tests.
• Solution: Check the dimensional accuracy and surface roughness of the sealing groove; ensure the groove area is free of burrs or flash; optimize the selection of sealing materials and compression ratios.
• Problem: The movable hinge breaks after repeated opening and closing.
• Solution: Optimize the wall thickness and fillet transition in the hinge area; ensure melt flow along the hinge axis through mold flow analysis; select an appropriate polypropylene (PP) grade.

Important Considerations:

• Provide a complete 3D assembly drawing of the cap assembly before mold design, clearly defining thread specifications, sealing surface locations, and movable hinge structural requirements.
• Accurately specify plastic material grades and food contact grade certification requirements for shrinkage setting and steel selection evaluation.
• Regularly clean oil stains and debris from the opening mechanism and slider area to ensure smooth operation.
• During mold storage, perform rust prevention treatment on cavities and precision areas (such as threaded inserts).

Q: 10. If I want to develop a product containing injection-molded parts, what kind of assistance can you provide?

We can provide full support ranging from product development review and structural design, to mold manufacturing, volume injection molding, printing, and assembly. We can collaborate with customers in the early stages of product development to optimize designs for cost reduction and improved manufacturability.

Q: 9.What is the company's quality policy?

The company always adheres to the quality policy of "Precision, High Efficiency, Forging Quality," and is committed to providing customers with high-quality services through advanced technology and an excellent management team.

Q: 8.What are your competitive advantages compared to other mold enterprises?

Our advantages lie in the combination of Singapore's precision mold technology, advanced production equipment (extensive imported CNC and injection molding machines), a comprehensive one-stop production process (from design to assembly), and a strict quality management system certified by IATF 16949.

Q: 7.Who are your main customers, and to which regions are the products exported?

We have established good cooperative relations with well-known companies, including UK's Land Rover and Triumph Motorcycles, domestic SAIC, Changan, ABB charging stations, and Japan's Tiger Corporation. Our products are exported to countries such as Japan, Europe, and the United States.