The Science Behind Plastic Caps: How They Were Made And Protect the Content?

2023-05-26 17:38:09

The Importance of Plastic Caps for Packaging

Plastic caps are commonly used as container seals in daily life. They can be used for bottles, buckets, cans, etc. They are made of various plastics, including polyethylene, polypropylene, and polystyrene, and are manufactured by injection molding. Whether it is to store or keep food fresh at home or to protect the product quality and prevent leakage in industrial production, plastic caps play a vital role.

Take bottle caps as an example. Bottle caps can effectively protect the contents from external contamination and prevent leakage. The key is that there is a "Liner" implanted inside the cap. The liner is mainly used to enhance the sealing performance of the cap. In some products with high sealing requirements, to ensure the quality and safety of the products, both caps and liners are used to ensure the sealing and freshness of the products.

Huarong injection molding machine can meet the production of various bottle caps


Bottle Cap Manufacturing and Liner Implantation, Achieved by Injection Molding and Automation

Bottle Cap Production Equipment, Meeting Your Injection Molding Needs
Injection molding machine is common production equipment for manufacturing bottle caps. First, the plastic is heated to a molten state, and injected into the mold through the barrel of the injection unit for pressure holding, cooling, and then molding. After molding, the mold is opened, and the product is automatically dropped out or taken out by automation equipment such as a robot arm. The whole process is efficient and fast. The injection molding machine can produce a large number of bottle caps in a short time. Especially a stable injection molding machine can ensure the high quality of the bottle caps.

The inside of the bottle cap often has a reverse hook design for internal threads. Because this part is easy to get stuck in the mold and cannot be demolded, the injection molding machine can be equipped with a core-pull device. The core-pull device can help pull up the reverse hook before opening the mold to facilitate demolding.

Huarong is a good industrial alliance partner that can provide customers with stable and durable injection molding machines. We have a professional R&D team that can provide you with the most satisfactory specifications and machines according to your product needs. For example, for producing bottle caps, we recommend using the General injection molding machine - HRN series. The inward toggle clamping design can quickly open and close the mold, shorten the cycle time. The structure is also dynamic computation with computer professionally, ensuring durability.

Liner Automated Implantation, Huarong Customized Turn-key Solution
The application of injection molding machines combined with automation equipment makes the implantation of liners more efficient and accurate. After the bottle caps are manufactured by the injection molding machine, they enters the stage of implanting liner. In this stage, automation equipment plays a key role. Through robot arms, conveyor belts and monitoring systems ensure that liners are accurately implanted inside each bottle cap.

With rich professional injection molding knowledge and experience, Huarong can provide you with integrated planning and solutions according to your production needs and product characteristics, from injection molding machines, molds, peripheral equipment to automated production.

About Huarong’s injection molding machine

Machine | General injection molding machine – HRN series

Feature |

  1. Structural parts are all analyzed by Nastran In CAD to ensure the structure's safety and the stable and reliable operation of the machine.
  2. Box-type platen maximized the clamping durability.
  3. Original screw design, wide versatility, high stability, good plastic melting and kneading ability, and improved injection stability.
  4. Customized service, adjustments, and optional can be made according to customer production needs, such as core-pull device and servo motor.


Caps Production with Liner Automation

▶️Video highlights 
Machine model | N series
Peripheral Equipment | Liner automation implantation




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