5 Different Aspects of a Plastic Cap Mold

A plastic cap mold can be the most important tool in your packaging business. These caps are essential for your customers' business. The team at SINOPK will analyze the design and sample of your cap to ensure that the end product meets your specifications. In this article, we will look at five different aspects of a plastic cap mold. This will help you choose the best mold for your plastic caps. Here are some of them:

Sliders

The plastic cap mold for sliders is a mold that enables the molding of tamper-proof bands. This mold is designed to minimize the cycle time and to minimize breakage and wear phenomena. It consists of two parts: a stationary part and an ejector part. The stationary part should have a guidance span of 0.6 or 0.8, while the ejector portion should have a guidance span of at least 0.7. A slider should be molded with one bolt, and two bolts will increase the risk of an obstructing part. In addition, the inclination slope of the bolts should be between 14 and 24 degrees. Otherwise, the sliders may be forced shut by excessive clamping pressure.

The sliders are opened and closed independently of each other, thus allowing the molding rate to be increased. In addition, this allows for the most effective use of the slider mold. The sliders are fitted with drive means 16 to minimize knocks and jolts, which can cause breakage. This feature allows for increased mold rates and maximized use. In addition, the plastic cap mold for sliders is designed to minimize breakage.

Bottom plate

A bottom plate plastic cap mold is an indispensable tool for producing tamper-proof caps. This mold has a slider mechanism that moves into a separated position after injection of plastic. The slider mechanism is independent of the top and bottom plates' movements. This feature increases the molding rate and helps optimize the mold. However, the sliders' movement must be controlled carefully to avoid breakage. As a result, this mold must be equipped with safety devices.

Color change

One of the most common problems in bottle cap factories is the difficulty of changing color. Color change in bottle caps is costly, not just because of the material and labor costs, but also because of the time required to create each variation. In addition, the traditional injection molding process is prone to color change issues. Most injection moulds use a needle point hot runner, which is expensive and complex internally. Molten plastic is easy to adhere to internal corners and side walls. This results in streaking of the color. Also, the waste cover is expensive, making it difficult to change the color.

Injection molding is a traditional process for producing plastic bottle caps. Nevertheless, it has its advantages as it combines recycled materials and can produce more colors than injection molding. Using the compression molding process can reduce the time needed for color changeover, and is becoming a popular choice for bottle cap manufacturers. Furthermore, it is easier to change color than the injection moulding process, and is less expensive. In addition, it has an advantage of improving the aesthetic properties and UV stability of a product.

Size of undercut

To produce an undercut in plastic injection molding, there are several steps required. Undercut design depends on the material used and the undercut size. The process may be expensive and complex. The size of the undercut is important to avoid distorted caps and ensure proper snap retention force. A proper plastic injection mold has a small undercut diameter. The undercut diameter can be increased by reducing the wall thickness. If the undercut is too small, the plastic cap may break during ejection.

Material used

When it comes to plastic bottle caps, the material used in the molding process is crucial. These kinds of caps come in different types, such as child-resistant, dispensing, and spraying styles. There are two basic types of plastic bottle caps: LDPE and HDPE. LDPE is the softer type and is typically used for 20-liter water bottles. HDPE is the more durable type and is often used for medical applications.

Both types of material are important. Plastic polymers are the best choice for high-volume applications, due to their low initial cost and long-term service life. In addition, aluminum is very cheap, but it has a short lifespan. The process of injection moulding plastic cap moulds requires high pressure and temperature, which increase the production cost. A single or multiple injection-mould cavity mould can minimize the cost of high-volume productions.

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