injection molding 

Injection molding: also known as injection molding, its principle is to add granular or powdery raw materials to the hopper of the injection machine. The raw materials are heated and melted into a flowing state. Under the push of the screw or piston of the injection machine, they enter the mold cavity through the nozzle and the pouring system of the mold, and harden and shape in the mold cavity.

The factors that affect the quality of injection molding include injection pressure, injection time, and injection temperature.

Advantages:

1. Short molding cycle, high production efficiency, and easy automation

2. Capable of producing plastic parts with complex shapes, precise dimensions, and metal or non-metallic inserts

3. Stable product quality

4. Wide range of adaptation

Application:

In industrial products, injection molded products include kitchen supplies (trash cans, bowls, buckets, pots, tableware, and various containers), electrical equipment casings (hair dryers, vacuum cleaners, food mixers, etc.), toys and games, various products from the automotive industry, and parts from many other products.

Dual color injection molding

Two color injection molding refers to the molding method of injecting two kinds of plastics with different colors into the same mold. It can make plastic appear in two different colors and present regular patterns or irregular cloud patterns to improve the usability and aesthetics of the plastic.

Process characteristics:

1. Core materials can use low viscosity materials to reduce injection pressure.

2. Core materials can be recycled and reused.

3. According to different usage characteristics, such as using soft materials for thick finished products, hard materials for core materials, or foam plastics for core materials to reduce weight.

4. Lower quality core materials can be utilized to reduce costs.

5. Skin or core materials can be used at high prices with special surface properties to enhance product performance.

6. The appropriate combination of skin and core materials can reduce residual stress in the formed product, increase mechanical strength or surface properties of the product.

Nano injection molding (NMT)

NMT (NanoMolding Technology): It is a process that combines metal and plastic using nanotechnology. The metal surface is first treated with nano technology, and the plastic is directly projected onto the metal surface, allowing the metal and plastic to be formed as a whole.

Nanoforming technology can be divided into two types of processes based on the position of plastic: one is the integrated molding of plastic as a non exterior surface; Another type is the integrated molding of plastic as the appearance surface.

Process characteristics:

1. The product has a metallic appearance texture,

2. Simplify the design of product mechanisms, making products lighter, thinner, shorter, and smaller

3. Reduce production costs and high bonding strength, as well as significantly reduce the usage rate of related consumables

Application:

Generally, electronic products such as Mobile phone case and notebook computer shell will use nano injection molding process.

Blow molding

Blow molding is the process of placing processed raw materials in a split mold, injecting compressed air to make the mold closely adhere to the inner wall of the mold, cooling, and demolding. Blow molding is generally divided into two types: thin film blow molding and hollow blow molding.

1. Film blow molding

Thin film blow molding is the process of extruding molten plastic into a cylindrical thin tube from the circular gap of the extruder head mold, while blowing compressed air into the inner cavity of the thin tube from the center hole of the head, expanding the thin tube into a larger diameter tubular film (commonly known as a bubble tube), cooling and then coiling.

2. Hollow blow molding

Hollow blow molding is a secondary molding technology that uses gas pressure to blow and expand the rubber like preform closed in the mold cavity into hollow products. It is a method of producing hollow plastic products. Hollow blow molding has different manufacturing methods according to the blank, including extrusion blow molding, injection blow molding, and tensile blow molding.

Advantages:

The product has uniform wall thickness, small weight tolerance, less post processing, and small waste corners, resulting in lower production costs; It has high resistance to various strains such as stretching, impact, bending, and environmental conditions, and has good usability. It is suitable for producing small precision products in large quantities.

Application:

1. Film blow molding is mainly used for manufacturing plastic films;

2. Hollow blow molding is mainly used to make hollow plastic products (bottles, packaging barrels, spray cans, fuel tanks, cans, toys, etc.).

Extrusion molding

Extrusion molding, also known as Extrusion moulding, is mainly suitable for the molding of thermoplastics, as well as some thermosetting and reinforced plastics with good fluidity.

The forming process involves using a rotating screw to extrude the thermoplastic raw material that has been heated and melted from the machine head with the desired cross-sectional shape, which is then shaped by a shaping device, and then hardened by a cooler to form the desired cross-sectional product.

Process characteristics:

1. Low equipment cost;

2. Easy to operate, easy to control process, and easy to achieve continuous automated production;

3. High production efficiency; The product quality is uniform and dense;

4. By changing the die of the machine head, various cross-sectional shapes of products or semi-finished products can be formed.

Application:

In the field of product design, extrusion molding has strong applicability. The types of extruded products include pipes, films, rods, monofilament, flat belts, nets, hollow containers, windows, door frames, plates, cable cladding, monofilament, and other special materials.

Rolling forming

Rolling forming refers to the method of connecting plastic raw materials into thin films or sheets through a series of heated radials under compression and stretching.

Process characteristics:

Advantages: Good product quality, large production capacity, and the ability to automate continuous production;

Disadvantages: Large equipment, high precision requirements, multiple auxiliary equipment, and limitations on the length of the product width compression extension machine barrel.

Application:

It is mainly used in the production of PVC soft film, sheet, sheet, Artificial leather, wallpaper, floor leather, etc.