blow molds

Extrusion blow molding molds are critical components for producing various hollow plastic products, such as bottles, containers, and cans.  The following are different types of extrusion blow molding molds, their characteristics, and their applications.

Large capacity single cavity molds

Large capacity single cavity molds are used to manufacture large plastic products with a capacity of more than 10 liters.  These molds are commonly used for producing water tanks, fuel tanks, and industrial containers.  For example, in the automotive industry, large capacity single cavity molds are used to produce oil tanks for trucks, buses, and heavy machinery.

Daily chemical products mold

Consumer packaging multi-cavity molds are used to produce small to medium-sized plastic products, such as bottles, cans, and containers.  The design of these molds is aimed at creating identical products at a high production speed, making them ideal for mass production.  They can have up to 6 cavities depending on the product design and required output.  For example, in the consumer packaging industry, multi-cavity molds are used to produce bottles for dishwashing liquid, shampoo, and laundry detergent.

Industrial packaging molds

Industrial packaging molds are used to manufacture large plastic products, such as drums, barrels, and crates, which can withstand harsh environments and heavy loads.  These molds are designed to produce thick-walled products that are structurally strong and have excellent impact resistance.  For example, in the chemical industry, industrial packaging molds are used to produce chemical drums, containers, and engine oil bottles.

Food packaging molds

Food packaging molds are designed to create plastic products that comply with strict food safety standards.  These molds are made of food-grade materials, such as stainless steel or aluminum, and require special surface treatments to avoid contamination.  They are commonly used to produce bottles, cans, and containers for dairy products, juices, sauces, and seasonings.  For example, in the beverage industry, food packaging molds are used to produce milk bottles, juice bottles, and sauce bottles.

Trimming devices

Trimming devices are used to remove excess plastic material from extrusion blow-molded products, such as bottles, cans, and containers.  They are essential for achieving precise and clean edges, improving the product’s aesthetic appearance and functionality.  These devices can be operated manually or integrated into the blow molding machine.

Mold materials

The choice of mold material depends on several factors, such as product design, production volume, and mold maintenance requirements.  Commonly used mold materials include aluminum, steel, and copper alloys.  Each material has its advantages and disadvantages in terms of durability, cost, and thermal conductivity.  The choice of mold material should consider a balance between performance and cost-effectiveness.  For example, in the pharmaceutical industry, aluminum molds are often used to manufacture plastic bottles for medicines because they are lightweight and easy to handle.

Mold design and process optimization

Mold design and process optimization play a crucial role in achieving high-quality and cost-effective plastic products.  Mold design should consider product size, shape, and material characteristics, while process optimization should aim to minimize production time and material waste while ensuring product quality.  Advanced technologies, such as computer-aided design and simulation, can be used to optimize mold design and process parameters.

Mold maintenance and repair

Proper mold maintenance and repair are crucial for ensuring the longevity and performance of extrusion blow molding molds.  Regular maintenance can prevent mold damage, reduce production downtime, and ensure product quality consistency.  Mold repair may be required for minor damage, such as surface scratches, or major damage, such as cracks or fractures.  Following the manufacturer’s mold maintenance and repair guidelines is critical to avoid compromising the mold’s structural integrity and performance.  For example, in the packaging industry, mold maintenance and repair are essential for maintaining the quality and consistency of plastic products.

Mold making process

1.Design and planning
In this step, the mold maker communicates with the customer to determine the specifications, shape, materials, and other information needed for the mold. Then, based on these requirements, the mold is designed, and the mold drawing is created. During this process, factors such as the mold’s usage environment, manufacturing cost, and production efficiency also need to be considered.
2.Making the mold core
Making the mold core is the core process of mold production. Typically, making the mold core requires the use of CNC machine tools or other numerical control equipment to precisely cut the required dimensions and shapes from the drawing. This step requires skilled mold makers to operate.
3.Making the mold shell
In the process of making the mold shell, suitable materials are selected according to the shape and size of the mold core and cut and assembled according to the design drawing. Typically, high-strength materials are used for the mold shell to ensure the stability and service life of the mold.
4.Mold debugging and testing
After the mold is completed, it needs to be debugged and tested. This step mainly checks the manufacturing quality and performance of the mold, including size, shape, wear resistance, corrosion resistance, and other indicators. Through testing, potential problems can be identified and solved in a timely manner.
The above is the general production process of extrusion molds, and the specific situation needs to be adjusted according to actual needs and material conditions.


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