Bottle Cap Mold Manufacturer

Bottle Cap Mold is a special mold for producing plastic bottle caps. In the plastic processing industry, the shape, size and precision of the bottle cap are determined, which affects the fit between the bottle cap and the bottle body, the sealing and the overall aesthetics. Bottle cap molds are usually composed of multiple parts, including cavity, gate, cooling system, demolding mechanism, etc. These parts work together to complete the Injection Molding process of plastic bottle caps.

The production of bottle cap molds mainly depends on the Injection Molding process.

Injection Molding is a widely used plastic molding method. The basic principle is to inject molten plastic into the mold cavity, and after cooling and solidification, a plastic product with the same shape as the mold cavity is obtained.

The Injection Molding process of bottle cap molds mainly includes the following steps:

Mold preparation: First, the bottle cap mold needs to be prepared and the mold must be clean and intact. The mold cavity should be consistent with the shape of the bottle cap required by the design, and the accuracy must meet certain standards.

Plastic melting: Add an appropriate amount of plastic raw material into the barrel of the injection molding machine, and melt the plastic raw material into a melt with a certain viscosity and fluidity through heating and shearing.

Injection: Driven by the injection molding machine, the molten plastic melt is injected into the mold cavity under high pressure. During the injection process, the injection speed, pressure and injection volume need to be controlled to ensure that the melt can fill the cavity and reach the required density.

Cooling and solidification: The melt is cooled and solidified in the cavity to form a plastic bottle cap with the same shape as the mold cavity. During the cooling process, the cooling speed and cooling time need to be controlled to avoid problems such as internal stress, deformation or cracks.

Demolding: When the plastic bottle cap is completely cooled and solidified, the demolding mechanism of the mold starts to work and ejects or pushes the bottle cap out of the mold. During the demolding process, it is necessary to ensure that the bottle cap can be smoothly separated from the mold without damaging the mold or the bottle cap itself.

The material used to make the bottle cap mold is usually high-performance mold steel.

Mold steel has excellent hardness, wear resistance, corrosion resistance and thermal stability, and can meet the various requirements of the bottle cap mold during the injection molding process. Common mold steel materials include P20, 718, 738, NAK80, S136, etc. These materials have different characteristics and applicable scopes, and can be selected according to the specific requirements and use environment of the bottle cap mold.

For plastic bottle caps after injection molding, a series of strict tests are required to ensure their quality and safety. Common test items include:

Appearance inspection: Check the surface of the bottle cap by naked eyes or using a magnifying glass to see if there are bubbles, cracks, discoloration, stains, impurities or other appearance defects. At the same time, it is also necessary to check whether the color of the bottle cap is uniform and has no color difference to ensure its aesthetics and brand consistency.

Dimensional accuracy detection: Use measuring tools such as vernier calipers and micrometers to measure the height, diameter, wall thickness and other dimensional parameters of the bottle cap to ensure that it meets the design requirements. In particular, the threaded part of the bottle cap needs to measure its pitch, tooth angle and other parameters to ensure the fit with the bottle body.

Weight detection: Measure the weight of the bottle cap with a precision electronic balance to ensure that it is within a certain tolerance range. This helps to control material costs and ensure the consistency of the bottle cap.

Sealing test: Test the sealing performance of the bottle cap and the bottle body by pressurizing or vacuuming. Ensure that the bottle cap will not leak air or liquid during normal use, especially when filling liquid products.

Pressure resistance test: Simulate the pressure that the bottle cap may withstand during use and transportation to test its pressure resistance. This helps prevent the bottle cap from breaking or deforming during use.

Drop test: Drop the bottle cap filled with contents freely from a certain height to test its impact resistance and drop resistance. Ensure that the bottle cap will not be easily damaged during transportation and use.

Material safety testing: For bottle caps used in food, beverage and other packaging fields, material safety testing is also required. For example, migration testing is used to test whether the bottle cap will release harmful substances when it comes into contact with the contents; chemical resistance testing is used to test the bottle cap's tolerance to chemicals such as acids, alkalis, and oils.

Bottle Cap Mold is an indispensable and important tool in the plastic processing industry. Its production relies on the injection molding process and is made of high-performance mold steel materials. For plastic bottle caps after injection molding, a series of rigorous tests are required to ensure their quality and safety. These test items cover all aspects from appearance to performance, from size to material safety, providing a strong guarantee for the production and use of bottle caps.