How to do secondary injection molding for pc and pbt (injection molding process of pc material)

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List of contents for this article:

• 1、Injection molding process of pbt crystalline materials
• 2、Plastic secondary processing method
• 3、Design method of rubber-coated buttons
• 4、Is pbt +65%pc suitable for secondary gluing?
• 5、Secondary injection molding, the outer layer is first molded and the inner layer is injected again.

Injection molding process of pbt crystalline materials

The core conclusion of the injection molding process of PBT crystalline materials: It is necessary to strictly control the barrel temperature, mold temperature and cooling rate to avoid uneven crystallization leading to product warping and appearance defects, and at the same time optimize injection molding parameters to match the crystallization characteristics of the material.

Brief introduction to PBT properties and injection molding process PBT properties PBT (polydibutyl terephthalate) is a crystalline thermoplastic engineering plastic made by the polymerization of dimethyl terephthalate (DMT) and 1,4-butanediol (1,4-Butanediol).

PBT injection molding process drying: This material is easily hydrolyzed at high temperatures, so drying before processing is very important. The recommended drying conditions in the air are 120 degrees for 6 to 8 hours, or 150 degrees for 2 to 4 hours. The humidity must be less than 0.03%. If drying with an absorbent dryer, the recommended conditions are 150 degrees, the 5-hour melting temperature: 225~275 degrees, and the recommended temperature: 250 degrees.

Plastic secondary processing method

Secondary processing of plastics mainly includes four categories: machining, connection molding, thermoforming and surface treatment. The specific methods are selected according to material characteristics and product requirements. Mechanical turning/milling/drilling: Use CNC machine tools or traditional machine tools to accurately cut plastic blanks. It is suitable for small batches of high-precision parts (such as gears and insulation parts), with tolerances up to ±0.1mm.

recycled plastics refer to plastic raw materials that are recycled after processing waste plastics through physical or chemical methods such as pretreatment, melt granulation, and modification. They belong to the secondary utilization of plastics. Sources of raw materials: The raw materials of recycled plastics are widely derived from various waste plastic products in production and life, including but not limited to waste food bags, sandals, wires, wire plates, agricultural films, pipes, buckets, basins, packaging belts, etc.

It is worth noting that secondary molding is mainly suitable for thermoplastics, which means that these plastics can be reshaped after heating and maintain a fixed shape after cooling. This method is based on one-time molded products, and performs fine processing and customization to meet more diverse product needs. Through secondary molding, we can produce plastic products of various complex shapes, enriching the types and application range of plastic products.

Commonly used resins include polystyrene, polyurethane, polyvinyl chloride, polyethylene, urea formaldehyde and phenolic aldehyde. Foams can be divided into two categories according to their cell structure: open-cell foams, whose pores are mainly interconnected; closed-cell foams, whose pores are mainly separated from each other. The open or closed cell foam structure depends on the manufacturing method.

Design method of rubber-coated buttons

The silicone coated waterproof button process mainly includes the following steps: making a button mold: making accurate productionHow to do secondary injection molding for pc and pbtButton moldHow to do secondary injection molding for pc and pbt, ensure that the shape and size of the button meet the design requirements. Select silica gel raw materials: according to product characteristicsHow to do secondary injection molding for pc and pbt, select silicone materials with good high and low temperature resistance, chemical resistance and waterproof properties. Mixing silica gel raw materials: Mix the silica gel raw materials evenly according to a specific formula to ensure the best quality and performance of silica gel.

Pack the button products through appropriate packaging methods. During the packaging process, it is necessary to ensure that the button products are not damaged and are easy to transport and use.

P+R rubber-coated buttons (waterproof) Application scenarios: Suitable for electronic product buttons that need to be waterproof. Structural features: P+R rubber-coated buttons are combined with plastic (P) and rubber (R) to ensure thatHow to do secondary injection molding for pc and pbtImprove the strength and stability of the buttons, and provideHow to do secondary injection molding for pc and pbtGood waterproof performance. Application scenarios of waterproof side keys (buttons + springs + rubber rings) for digital products: Side keys for digital products, such as mobile phones, tablets, etc.

Is pbt +65%pc suitable for secondary gluing?

PBT+65% PC material can be coated twice, but success depends highly on material matching and process control. Encapsulation feasibility basis PBT and PC alloys combine the rigidity, heat resistance, electrical insulation properties of PBT and the toughness and impact resistance of PC, providing a performance basis for secondary encapsulation. There are special encapsulating materials on the market (such as specific models of TPE and TPU) that have good adhesion to PBT/PC alloys.

PC material is twice wrapped with TPU material. It is recommended to make surface treatment agents in advance, which can greatly improve the bonding fastness of the two layers of materials and avoid delamination and degumming problems.

The core of rubber-coated button design lies in accurate control of rubber-coated thickness, material compatibility and mold accuracy, which is usually achieved by using two-color injection molding or secondary injection molding process.

PVC, TPE, etc. According to relevant information, PP, PS, ABS, AS, PC, PA, etc. can be laminated with ABS twice. Among them, it is best for TPE and ABS to be coated twice. The compatibility of TPE and ABS plastic needs to be matched, and the molecular solubility is close, so that the molecular compatibility is better.

Poor material compatibility: The polarity or solubility parameters of the substrate (such as ABS, PC) and the encapsulating material (such as TPE, TPU) do not match, and effective mutual solubility or chemical bonding cannot be formed between molecules. Substrate surface contamination: Before injection molding, there is release agent, grease or dust on the substrate surface to form an isolation layer. Improper temperature control: Insufficient preheating of the substrate or too low mold temperature causes the molten material to fail to activate the molecular chains on the surface of the soap substrate during secondary injection molding.

The product seems to be crude and indiscriminately made. When such a product is pushed on the market, it can only form negative publicity, and the product cannot be sold at a high price at all. Such high investment in the early stage can only be wasted. Dongguan city Yuzhuo Precision Plastic Products Co., Ltd. strongly recommends customers to make two-color molds. If customers insist on making secondary molding and overcoating molds, we can only suggest customers to make molds elsewhere. We have seen too much and don't want to harm customers.

Secondary injection molding, the outer layer is first molded and the inner layer is injected again.

1. Process flow (1) Mold preparation: Use the rotating mold or moving core mold matched with the two-color injection molding machine, the first injection cavity forms the outer layer, and the second injection cavity forms the inner layer. (2) First injection molding: Inject the outer layer material (such as PC, ABS and other engineering plastics) into the mold, cool and set to form the product shell. (3) Mold core rotation/shift: The mold automatically rotates or translates to make the formed outer part enter the second injection cavity and align it with the inner injection position.

2. Core principle Through precision molds and double barrel injection molding machines, core materials (such as PC, ABS and other engineering plastics) are first injected, and then skin materials (such as TPU, TPE and other elastomers) are injected using the secondary cavity of the same mold. In the molten state, molecular bonding is achieved to form a composite structure with soft touch/wear-resistant outer layer + hard support inner layer.

3. Secondary injection molding is a manufacturing process that uses two or more different types of plastic raw materials to inject into a single product in a step-by-step manner. The following is a detailed explanation of secondary injection molding: Principle: Secondary injection molding involves injecting two different plastic raw materials into the same mold step by step to form a single product with composite characteristics. Process: During the first injection molding, a plastic is injected into a cavity of the mold.

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