Cap Mold
Plastic Bottle Cap Mold Manufacturer & Supplier China
High Precision Injection Cap Molds for Beverage, Food, Oil & Cosmetic Packaging
Get your custom bottle cap mold solution within 24 hours
With over 15 years of specialized experience in plastic injection mold manufacturing, Younce Mold has established itself as a trusted partner for global beverage, food, and cosmetic brands. Our state-of-the-art manufacturing facilities and strict quality control processes ensure that every cap mold we produce meets the highest industry standards for precision and durability.
Plastic Cap Injection Mold Wholesale
Our cap mold specifications are designed to accommodate the diverse needs of modern packaging production lines. Whether you require a small 2-cavity mold for trial production or a high-output 48-cavity mold for mass production, we can customize every aspect to match your exact requirements. All our molds are manufactured using premium grade steels and precision machining techniques to ensure dimensional accuracy and long service life.
Why Global Buyers Choose Younce Cap Moulds
At Younce Mold, we understand that the quality of your bottle cap molds directly impacts your production efficiency and product quality. Our competitive advantages are built on decades of engineering expertise and a commitment to continuous improvement. We work closely with each client to understand their unique production requirements, ensuring that our molds deliver consistent performance and maximum ROI throughout their lifecycle.
✅ High-speed injection molding & long mold life
✅ Stable cap quality with perfect sealing
✅ Multi-cavity options for mass production
✅ OEM & custom cap mold support
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Shaping Modle |
Plastic Injection Mold |
Mould Design Software |
UG, CAD/CAM etc |
|
Place of Origin |
Zhejiang, China |
Mould Surface Treatment |
Polishing finish |
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Brand Name |
Younce |
Mould Hardness Treatment |
Nitrogen treatment |
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Mold Type |
Plastic Cap Mold |
Mould Processing |
Wire cutting, high-speed engraved, CNC, polishing, etc. |
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Product Material |
Steel |
Mould Life |
1 million shots at least |
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Mould Structurer Material |
P20, S136, H13 and others |
Mould Gate Type |
Point gate, latent gate etc |
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Mould Runner |
Hot/cooled runner system |
Mould Cycle Time |
Based on cap neck size,weight,structure etc |
Advanced Manufacturing & Quality Control
Our manufacturing process combines advanced CNC machining technology with rigorous quality control procedures to ensure every mold meets our strict precision standards. From initial design and material selection to final assembly and testing, each step is overseen by our team of experienced engineers and quality inspectors. This comprehensive approach ensures that our molds produce caps with consistent dimensions, perfect sealing properties, and excellent surface finish.
- High-speed CNC machining
- EDM precision processing
- Mirror polishing for smooth cap surface
- Assembly & trial molding testing
- Leakage & sealing verification
Successful Export Projects
Our cap molds have been successfully deployed in production facilities across six continents, serving major multinational brands as well as local packaging manufacturers. We have established a global logistics and support network to ensure timely delivery and ongoing technical assistance for our international clients. Our export success is built on consistent quality, competitive pricing, and a deep understanding of regional packaging regulations and market requirements.
Our molds have been delivered to clients worldwide:
We provide full after-sales support including spare parts and mold maintenance guidance.
Get a Fast Cap Mold Quotation
Our dedicated sales and engineering team is ready to provide you with a detailed, no-obligation quotation tailored to your specific cap mold requirements. We understand that time is critical in the packaging industry, which is why we commit to responding to all quotation requests within 24 hours with a comprehensive proposal that includes design recommendations, pricing, and delivery timelines.
Tell us your cap requirements and receive a complete solution:
✅ Mold design proposal
✅ Cavity recommendation
✅ Quotation & delivery schedule
✅ Free technical consultation
Cap Mold FAQ
We've compiled answers to the most frequently asked questions about our cap mold products and services. If you don't find the information you need here, our technical support team is available to provide detailed answers to any additional questions you may have about mold design, production, maintenance, or customization options.
Q1: What cavity number is best for cap production?
For medium production, 8–16 cavities are common. For large bottling plants, 24–48 cavities provide maximum output.
Q2: Can you make custom cap molds based on our sample?
Yes. We offer full OEM mold development based on sample, drawing, or 3D file.
Q3: What is the typical mold lead time?
Standard molds take 25–45 days, depending on cavity number and cap complexity.
Q4: Do you provide after-sales support?
Yes. We provide spare parts, mold maintenance guidance, and long-term technical support.
What are the structural components and functions of a bottle cap mold?
Cavity and core
Precision parts that form the inner and outer shapes of the bottle cap. The cavity determines the outer surface of the bottle cap, and the core forms the internal thread or snap-on structure.
01
Gating system
This includes the main channel, branch channel, and gate, which control the flow path and filling efficiency of the plastic melt.
02
Ejection mechanism
To avoid deformation, the molded bottle cap is ejected from the core plate through the push plate, or the product is directly ejected through the sleeve.
03
Cooling system
The cavity, core, and push plate's water channel design accelerates the bottle cap's cooling and shortens the molding cycle.
04
Guide positioning components
Ensure the precise mold closing of the movable mold and the fixed mold parting surface to avoid misalignment.
05
How can a cap mold be made with good quality and stability?
The structural stability of the bottle cap mold affects production efficiency and product quality. A stable mold structure can ensure dimensional accuracy, extend service life, and reduce scrap rate. The following are the key factors and optimization measures that affect the structural stability of the bottle cap mold:
Material selection and heat treatment
The mold material must have high strength, wear, and corrosion resistance. Commonly used materials include P20 for the push plate main board, H13 for the push sleeve, SKD61 steel for the sleeve, S136 for the cavity and core, etc. The surface hardness (HRC 50-55) is improved through heat treatment processes such as quenching and nitriding, and the anti-deformation ability is enhanced. The material consistency of the mold core and the cavity, and using D13 for the push sleeve, can reduce the stress concentration caused by the difference in thermal expansion.
Parting surface design
The reasonable layout of the parting surface directly affects the closing accuracy of the mold. Use a flat or stepped parting surface and fine grinding (roughness Ra≤0.8μm) to ensure no gap when the mold is closed. For threaded bottle caps, a slider or a rotary demolding mechanism must be added, and the parting surface must avoid key functional areas to avoid flash.
Cooling system balance
Uneven cooling can cause thermal deformation. Use a circumferential water channel design to ensure that the distance between the cooling channel and the cavity is consistent (usually 10-15mm), and optimize the water channel layout through CAE simulation. Copper alloy inserts can accelerate local heat dissipation and reduce temperature difference stress.
Support and guide the structure
Increase the number of mold feet, support columns (diameter ≥φ30mm), and guide columns (SKD61 material) to improve the rigidity of the template. The four-corner guide columns are positioned with a conical surface, and the accuracy must be controlled within ±0.02mm to prevent misalignment caused by lateral force.
Optimization of the demoulding mechanism
The ejector pin layout needs to be symmetrical (e.g., 8-12 pins are evenly distributed), and the diameter and stroke need to match (e.g., φ3mm ejector pin stroke ≤15mm) to avoid ejection eccentricity. The spring reset mechanism needs to be preloaded by 5%-10% to ensure fast reset without delay.
Dynamic balance design
During high-speed injection molding, the mold must pass the dynamic balance test to avoid vibration caused by the inertia force. The matching clearance of moving parts (such as inclined ejector) is controlled at 0.03-0.05mm, and self-lubricating materials are used to reduce wear.
What is the cap mold injection molding process?
During the injection molding process of the bottle cap mold, after the mold is closed, the molten plastics, such as PP and PE, are injected, pressure is maintained, cooled, and solidified. The injection screw of the injection molding machine retreats, and under the action of the spring, the mold opens along the parting surface. When the limit screw plays a limiting role, the runner pull plate breaks through the point gate, pulls the solidified material out of the cavity plate and automatically falls. The cavity plate continues to retreat under the drive of the injection molding machine, driving the template to move. When the limit screw plays a limiting role, the fixed mold part stops moving; due to the shrinkage of the melt during the cooling process, the plastic part is filled on the core. Driven by the injection molding machine, the movable mold part retreats, and the product is demolded from the cavity. At the same time, the inclined guide column pushes away the half block to complete the lateral core pulling action, and the movable mold part continues to retreat. When the limit plate plays a limiting role, the push plate separates the plastic part from the core, the mold is closed, and the demolding and side core pulling mechanisms are reset to complete an injection cycle.
How can we better improve the quality of plastic bottle caps?
The mold is designed as a three-plate type with a point gate according to the product structure. The gate is set in the center of the top of the plastic part. The point gate can significantly increase the shear rate of the melt, greatly reduce the melt viscosity, and facilitate mold filling. It is particularly effective for melts such as PE and PP that are sensitive to shear rate. In addition, as packaging containers, plastic parts have high requirements for appearance quality. The residual traces of the point gate are small, which can ensure the surface quality of the plastic parts. The gate is automatically broken during demolding, which is convenient for realizing the automation of the product production process, improving production efficiency, and increasing economic benefits. The non-balanced pouring system is adopted, the cavity is compactly arranged, and the mold size is reduced. To enable each cavity to be filled evenly simultaneously, the BGV (Balanced Gate Value) method is used to manually modify the gate size of each cavity to achieve balance. The cold material well is used to store the front cold material.
How can we maintain the plastic cap mold and extend its life?
Various dirt, including plastic residues and oily substances, often adheres to the bottle cap mold during production. Not only is its appearance affected, but if it is not treated, it will also hurt product quality and mold life. The actual situation shows that targeted mold cleaning agents can be wiped with a soft cloth or sponge, and finally, the residue can be completely removed with clean water. When dealing with stubborn dirt, a mixture of vinegar and bleach is extremely effective. Mix them in equal proportions, spray them, wait 3 ~ 5 minutes, and then rinse thoroughly with water to achieve the ideal cleaning effect. It has been shown that gently wiping small stains with toothpaste and soap is also quite effective on weekdays. These seemingly simple tips can make work more efficient and improve efficiency imperceptibly.
FAQ
As one of the most professional cap mold manufacturers and suppliers in China, we're featured by quality products and good service. Please rest assured to wholesale custom made cap mold from our factory.
Plastic Cap Mould, PET Cover Mould