What Are Plastic Caps Used for?

In the packaging industry, plastic caps are essential for sealing bottles, jars, containers, pails, buckets, tubs, tubes, and drums. They help keep food, beverages, and personal care products fresh while preventing leaks and contamination.

What is Cap Injection Mould?

Injection mould is a manufacturing process where molten plastic is injected into a mold cavity, where it cools and solidifies to the desired shape. Cap injection moulds are specifically designed to produce caps, often with complex geometries like threads, sealing lips, and other features. The process involves heating the plastic, injecting it into the mold under high pressure, and then cooling the plastic to allow it to solidify into the cap shape. For high-volume production, caps are often molded in multi-cavity moulds, allowing for multiple caps to be produced in a single molding cycle.

The Advantages of Injection Molding Caps

In injection moulding, the moulding cap keeps the mould secure during injection. It seals and encloses the molten material within the mould, ensuring it solidifies into the desired shape, and averts potential leaks that might cause flaws in the end product. It also regulates material flow, prevents material waste, and enhances accuracy, quality, and efficiency in the injection moulding process. The smooth surfaces and contours of the moulding cap enable the easy release and ejection of the moulded part from the cavity. This feature enhances productivity and minimizes the risk of damage to the part during the ejection process.

What Steels Do We Use for Cap Moulds?

Our cap mould ranges from 1 cavity to 48 cavities. The mold can be hot runner or cold runner. The cap mould base is combination of P20 & S45C with heating treatment, the mould core and cavity plate is made of stainless steel, such as S136, 1.2316 etc. The cap mould is with standard interchangeable mould components. We have special designed nozzles ensure our unique feature. High performance hot runner system ensures uniform melt flow and pressure in all cavities. All of parts are manufactured by CNC equipments. We have excellent design of cooling channel shorten cycle time.

The Gate of Cap Moulds

Injection gates are crucial in the injection molding process, allowing the plastic to flow and fill the mold cavity. The gate location and design can impact the finished cap's aesthetics and functionality, so careful consideration is needed. Gates come in various styles, such as pin gates, disc gates, and submarine gates, each with its pros and cons. Gate placement can affect aesthetics, as the gate mark may be visible on the finished cap. It's best to place the gate in a non-cosmetic area whenever possible. After the cap is ejected from the mold, a small lump of plastic, the gate vestige, remains. This needs to be trimmed away.

Hot Runner or Cold Runner for Cap Mould

For a cap mould, hot runner systems offer several advantages over cold runner systems, especially for high-volume production and applications requiring high precision and minimal waste. Hot runner molds use heated channels to keep the molten plastic in a molten state, eliminating the need for traditional runners and reducing material waste. While cold runner molds are more economical and easier to maintain, they can lead to more waste, slower cycle times, and potential part design limitations.

Cold runner systems may be more suitable for lower-volume production, less complex parts, or when cost is a primary concern. The choice between the two depends on the specific production requirements and budget constraints.

What Cap Moulds We Can Offer?

With many years of practicing and development, Micon has become a mature plastic mould maker. One of our advantages is plastic cap mould manufacturing. We have accumulated rich experience in different kinds of screw and unscrew cap mould and closure mould, such as plastic mineral water cap mould, bottle beverage cap mould, 3 gallon or 5 gallon bottle cap mould, tamperproof cap mould, child resistant cap mould, flip top cap mould, disc top cap mould, shampoo cap mould, edible oil cap mould, engine oil cap mould, jerry can cap mould, sport cap mould, cosmetics cap mould, wine cap mould, toothpaste cap mould, aerosol cap mould, candy cap mould, jar cap mould, eye drop cap mould etc in hot runner or cold runner system, with auto drop, motor release cap, knock-off release according to customer's needs.

Different Types of Injection Moulding Caps

Moulding caps come in various types, each designed for specific applications. In order to select the most suitable one for a particular injection moulding project, it is helpful to understand the different types.

The standard cap is widely used in general injection moulding applications. It offers a good balance of performance, cost-effectiveness, and versatility. Standard caps are available in different sizes and configurations to accommodate various mould designs and material requirements.

The hot runner cap is used for high-volume production and complex part designs. Hot runner caps feature a heating system that keeps the material in a molten state as it enters the mould cavity. This eliminates the need for re-heating the material with each injection cycle, resulting in faster production cycles and reduced material waste.

The multi-cavity cap is often used for projects that require multiple cavities, allowing for the simultaneous injection of multiple parts within a single mould. It improves productivity and efficiency by producing multiple components in each injection cycle.

The choice of moulding cap depends on the material used, the desired part design, and production requirements. Selecting the appropriate cap to ensure optimal performance and product quality is crucial.

Features of Flip Top Cap Mold

Hinged mechanism

The flip top cap mould is designed with a hinge mechanism that allows the cap to flip open and closed.
Precision and accuracy

The mould is designed with precision and accuracy to ensure that the caps produced are of consistent size and shape.
Durability

Flip top cap moulds are usually made of high-grade steel or aluminum, making them durable and long-lasting.
Ejector system

The mould is typically equipped with an ejector system, which allows the caps to be easily removed from the mould once they have been formed.
Variety of designs

Flip top cap moulds can be designed with a variety of styles and sizes to accommodate different bottle and container sizes.
Easy maintenance

Flip top cap moulds are typically easy to maintain and can be quickly disassembled for cleaning or replacement of worn parts.

Ultimate FAQ Guide to Plastic Cap Molds

What is The Production Method of Plastic Bottle Cap?

Most plastic bottle caps are manufactured through a process known as injection molding. This process enables can achieve achieve plastic bottle cap of various size, structure shape, high surface finishing and various colored.
How to Plan The Gate of Plastic Cap Mold?

According to specific customer requirements, there are hot runner, cold runner and semi hot runner options for cap molds. The sprue of the hot runner is usually placed in the center of the cap, which is conducive to mold filling. Cold runner can have three plate molds and submarine gate to choose from. During demoulding, the gate is actively pulled off.
What Plastic is Usually Used for Cap Molds?

There are many types of plastic to choose from for the cap. Usually PP or PE are used. Some special covers are made of PET plastic or ABS plastic.
Why is Cap Mold Important?

In the packaging industry, plastic caps are essential for sealing bottles, jars, containers, pails, buckets, tubs, tubes, and drums. They help keep food, beverages, and personal care products fresh while preventing leaks and contamination.
What Steels Use for Cap Moulds?

The cap mould core and cavity plate is made of stainless steel, such as S136, 1.2316 etc. The cap mould is with standard interchangeable mould components.
What are The Advantages of Cap Mold Self-Locking?

Each cavity of the plastic bottle cap mold is self-locking independently, which can ensure the concentricity of the mold. The excellent cooling system can achieve the high efficiency of constant temperature water cooling, and the shear free gate can reduce the labor intensity of workers.