Tool & Die in Ningbo Crete Plastic Co., Ltd.'s Production

In the manufacturing process of plastic products at Ningbo Crete Plastic Co., Ltd., tool and die play a crucial role as the core components that determine the shape, precision, and quality of the final products. Whether it is injection molding, blow molding, or other processes, the design, manufacturing, and maintenance of tooling directly affect production efficiency and product consistency.

1. Types of Tool & Die Used

According to the different manufacturing processes of the company's main products, the tooling used can be divided into the following categories:

1.1 Injection Molding Dies

Injection molding dies are the most widely used tooling in the company, mainly used for the production of cosmetic jars, bottle caps, pump bodies, and other components.

• Structure: These dies usually consist of a fixed mold half and a movable mold half. The fixed mold half is installed on the fixed platen of the injection molding machine, and the movable mold half is installed on the movable platen. The cavity and core in the die determine the external and internal shape of the product. For example, the die for cosmetic jars has a cavity that matches the jar's external threads and surface patterns, and a core that forms the internal space of the jar.
• Material: To ensure wear resistance and service life, injection molding dies are often made of high-quality alloy steels such as P20, 718H, or H13. For products with high surface requirements, such as transparent PET jars, the die cavity is usually polished to a high gloss to replicate the smoothness onto the product surface.

1.2 Blow Molding Dies

Blow molding dies are essential for the production of cosmetic bottles, especially those for serums and toners.

• Structure: They are typically composed of two symmetrical mold halves. When closed, they form a cavity corresponding to the shape of the bottle. The die is equipped with cooling water channels to rapidly cool the molten plastic after inflation. For example, the die for a perfume bottle has a cavity that includes the bottle's neck, body curves, and bottom structure, ensuring the blown bottle has precise dimensions and a beautiful appearance.
• Venting: Since blow molding relies on compressed air to expand the parison, the die is designed with small vent holes to discharge the air between the parison and the die cavity, preventing defects such as bubbles and incomplete filling.

1.3 Extrusion Dies

Extrusion dies are used in the production of cosmetic tubes, shaping the molten PE into a continuous cylindrical tube blank.

• Structure: These dies usually have a circular orifice (die lip) that determines the outer diameter of the tube, and a mandrel inside that forms the inner diameter. The gap between the die lip and the mandrel controls the wall thickness of the tube. For cosmetic tubes, the die is designed to ensure uniform wall thickness around the circumference, which is crucial for the subsequent printing and sealing processes.

1.4 Assembly and Testing Fixtures

In addition to molding dies, the company also uses various assembly and testing fixtures to ensure the quality of sprayers, pumps, and airless bottle assemblies.

• Assembly Fixtures: These fixtures position and clamp the components (such as pump bodies, pistons, and nozzles) during assembly, ensuring accurate alignment and consistent assembly quality. For example, a fixture for lotion pump assembly can fix the pump body in place, allowing the automatic insertion of the piston and spring with precise force and depth.
• Testing Fixtures: Used in the testing phase, such as leak testing fixtures for bottles. These fixtures can seal the bottle mouth and apply pressure to detect whether there is any leakage, ensuring the tightness of the product.

2. Design and Manufacturing of Tool & Die

The design and manufacturing of tooling are key links that affect product performance and production efficiency, and Ningbo Crete Plastic Co., Ltd. attaches great importance to this process.

2.1 Design Considerations

• Product Requirements: The die design must fully consider the product's structure, dimensions, and surface quality. For example, for airless bottles with strict sealing requirements, the die for the bottle body and piston must ensure precise matching of their mating surfaces to prevent air leakage.
• Material Properties: Different plastic materials have different shrinkage rates. The die design needs to compensate for this shrinkage. For example, PE has a larger shrinkage rate than PET, so the dimensions of the PE tube die cavity are larger than the actual product size to ensure the final product meets the required dimensions after cooling.
• Manufacturability and Cost: The die structure should be simple and easy to process to reduce manufacturing costs. At the same time, it should be convenient for later maintenance and repair, such as using standardized components for easy replacement.

2.2 Manufacturing Processes

The manufacturing of tooling involves multiple precision processing technologies:

• CNC Machining: CNC milling and turning machines are used to process the die cavity, core, and other key components, ensuring high dimensional accuracy. For complex shapes, 3D machining centers can achieve precise processing of curved surfaces and intricate structures.
• EDM (Electrical Discharge Machining): Used for processing deep grooves, narrow slits, and other structures that are difficult to machine with traditional cutting tools. For example, the fine threads on cosmetic bottle cap dies can be accurately formed using EDM.
• Grinding and Polishing: After machining, the die cavity and core undergo grinding to improve surface flatness and dimensional accuracy. Polishing is then performed to achieve the required surface roughness, which is particularly important for transparent products to ensure their clarity.

3. Role of Tool & Die in Production

Tooling is the foundation of plastic product manufacturing, and its role is reflected in multiple aspects:

3.1 Ensuring Product Quality

High-quality tooling can ensure the consistency of product dimensions, shape, and surface quality. For example, a well-designed injection molding die can produce cosmetic jars with uniform wall thickness, no warping, and clear surface patterns, meeting the aesthetic and functional requirements of customers.

3.2 Improving Production Efficiency

Reasonable die design can shorten the production cycle. For example, multi-cavity injection molding dies can produce multiple products in one molding cycle, greatly improving production efficiency. For example, a bottle cap die with 16 cavities can produce 16 caps at a time, which is much more efficient than a single-cavity die.

3.3 Reducing Production Costs

Durable tooling with a long service life can reduce the frequency of die replacement, thereby reducing production costs. In addition, a well-designed die can reduce material waste. For example, the runner system in an injection molding die can be optimized to minimize the amount of plastic in the runner, saving raw materials.

4. Maintenance and Management of Tool & Die

To ensure the long-term stable operation of tooling, the company has established a complete maintenance and management system.

4.1 Regular Maintenance

• Cleaning: After each production batch, the die is cleaned to remove residual plastic, oil, and other contaminants, preventing them from affecting the next production.
• Lubrication: The moving parts of the die, such as guide pillars and guide sleeves, are regularly lubricated to reduce wear and ensure smooth movement.
• Inspection: Regularly inspect the die for cracks, wear, and deformation. For example, check the cavity surface for scratches or corrosion, and replace worn components in a timely manner.

4.2 Repair and Modification

When the die is damaged or the product design is changed, the die is repaired or modified. For example, if a cosmetic bottle's design is updated with a new pattern, the die cavity can be reprocessed or a new insert can be added to avoid the cost of manufacturing a new die.

4.3 Storage Management

Idle dies are stored in a dry, clean environment to prevent rust and damage. They are also labeled with information such as the product name, die number, and last used date for easy tracking and management.

In summary, tool and die are indispensable in Ningbo Crete Plastic Co., Ltd.'s plastic product manufacturing process. From product design to mass production, the quality of tooling runs through the entire process, directly affecting the company's product quality, production efficiency, and market competitiveness. By continuously optimizing the design, manufacturing, and maintenance of tooling, the company can better meet the needs of customers in the cosmetic and personal care industry and achieve sustainable development.

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