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HIPS(High impact polystyrene) is an impact-resistant polystyrene product created by adding butyl rubber particles to polystyrene. This polystyrene product is added with micron-sized rubber particles, and links the polystyrene and the rubber particles together by means of grafting. When subject to an impact, the tip end stress of the crack propagation is released by the relatively soft rubber particles. Therefore, the crack propagation is hindered and the impact resistance is improved.   HIPS Engineering Plastic Milky white opaque pellets, with a density of 1.05g/cm3, a melting temperature of 150-180°C, and a thermal decomposition temperature of 300°C. HIPS is one of the cheapest engineering plastics. When compared with ABS, PC/ABS and PC, the glossiness of the material is relatively poor, and … Read more

Steel hardness describes the properties of steels that resist deformation, indentation, penetration, and scratching. steel hardness is important because the inherent resistance of the surface to withstand friction or erosion by oil, steam, and water from injection molding process,there are several harness test method as below: 1.Brinell Hardness (HB) Press a hardened steel ball of a certain size (usually 10mm in diameter) against the surface of the material with a certain load (usually 3,000kg) for a period of time. After the load is removed, the ratio of the load to the area of indentation is referred to as the Brinell hardness (HB), measured in kg/mm2 (N/mm2).   2．Vickers Hardness (HV) Use a diamond square cone presser to penetrate into the surface of … Read more

Thermoplastic Elastomer (TPE) Domestically in China, it is usually known as “TPE”, basically referring to the styrene-based thermoplastic elastomer. The styrene-based TPE (known as TPS in foreign markets) is a copolymer of butadiene or isoprene and styrene block, so its performance is similar to that of SBR. Strengths: High elasticity of rubber and plastic injection moldability; environmentally friendly, non-toxic and safe; excellent coloring, smooth touch, weatherability, fatigue / temperature resistance, excellent processability, no need for vulcanization, and able to be recycled for cost reduction. It can be co-molded with such base materials as PP, PE, PC, PS and ABS, or molded separately. Weaknesses: The biggest problem with SBS and SIS is their low heat resistance – the temperature should not … Read more

Warpage as one of the most common defects in a plastic injection molded product, refers to the situation in which the shape of the injection molded part deviates from the shape of the mold cavity. The following is a brief analysis of the factors that affect the warpage of the injection molded products. How the mold structure influences the warpage of an injection molded product With regard to the mold, the main factors that affect the deformation of a plastic part are the gating system, the cooling system and the ejection system Gating System The gate location, type and quantity of a plastic injection mold affect the filling status of the plastic in the mold cavity, leading to changes to … Read more

A variety of plastics coloring systems can be used to get color for the plastic materials, each possessing its unique features, benefits, and weaknesses.now we share some plastics coloring process as below: Select a Color Scheme According to the plastic properties, the molding process, the toner characteristics, the color matching principles, the product requirements and other comprehensive considerations, match the various toners, and then achieve the required color requirements. Each color has a certain hue, a certain brightness, and a certain degree of saturation, so you can call up tens of thousands of different colors by changing these three factors. Therefore, during toning, it is the most basic technique to adjust the three factors of depth, hue and difference. The … Read more

Poly phenylene sulfide, abbreviated as PPS, is a new type of engineering plastic, which is mainly divided into two categories: one is a branched thermoplastic polymer with a high viscosity, and the other is a thermosetting polymer which has a linear molecular structure before curing, and can be softened to a certain extent if sufficiently heated after curing. In the following, we will mainly introduce the thermosetting PPS. The Properties of PPS Physical Properties PPS is a white, highly crystalline polymer with a density of 1.34. It is characterized by excellent mechanical properties, with tensile strength and flexural strength superior to that of PA, PC, and PBT, etc. It possesses extremely high rigidity and resistance to creep, but high brittleness … Read more

Flash, also known as flashing or burrs, mostly occurs between the matching parts of a mold, such as the parting surface of the mold, the sliding part of the slider, the clearance of the insert, and the gap of the ejector, etc. If the flashing is not resolved in a timely manner, it will be further worsened, so that the mold will be pressed to cause local collapses or other permanent damages. The flashing occurring in the clearance of the insert and the gap of the ejector will also cause the product to stick on the mold, thus affecting ejection. Flash is actually the excessive plastic material which enters the matching gaps of the mold and is attached to the … Read more

A plastic injection mold is one of the most important tooling for injection molding, whose quality directly determines the quality of the final product. In the meantime, the mold cost takes up a great proportion in the production cost of an injection molder. If the injection mold life is short and the precision is not well kept, not only will the product quality be affected, but also huge waste will be caused, including material waste and labor waste during plastic injection molding. Therefore, increasing the service life of injection mold has a significant impact on reducing the cost of plastic products, as well as improving tooling productivity and company competitiveness. During the plastic injection molding process, some plastics will decompose … Read more