Jiangmen foam factory tells you, what are the usage classifications of foam plastics?

　　The Jiangmen Foam Factory tells you about the classification of foam plastics. Let's take a look together. Those with interconnected microporous structures are called open-cell foam plastics, while those with relatively closed structures are called closed-cell foam plastics. Foam plastics can be hard or soft. According to the standards of the American Society for Testing and Materials, a 2.5cm diameter rod is rotated at 18-29°C for 5 seconds without breaking, and is tested as flexible foam.

Conversely, it belongs to rigid foam plastics. Foam plastics can also be divided into low-foam and high-foam types. Generally speaking, a foaming rate (the multiple of the volume after foaming is greater than the number of pre-foaming) less than 5 is called low-foam, and greater than 5 is called high-foam. 1. Rigid foam plastics at room temperature form a polymer of foam plastics that is crystalline or amorphous, and the glass transition temperature is significantly higher than the general room temperature, so the economic foam plastics have a harder texture at room temperature. The melting point of the polymer forming the foam is lower than room temperature or the glass transition temperature of the amorphous polymer, and the material is soft at room temperature. 3. Semi-rigid (or semi-soft) foam is a foam between the above two categories. The Jiangmen Foam Factory tells you that there are many classifications of polyurethane foam. For example, according to the processing method, it can be roughly divided into two stages (or artistic methods), anti-artistic methods, one-stage and spraying methods. According to the different density development methods of economic foam cells, it can be divided into high, medium, low, and ultra-low density foams, high-density self-skinned foams, or whole leather foams. The latter is a special form of foam with uneven density, different from the previous one. It only produces a relatively normal foam inside the foam. The surface does not produce economic foam or produces very little foam. A dense skin is formed on the outer surface of the foam, and its density is greater than the inner surface, and the density gradient from the skin to the core changes significantly. It is a semi-rigid molded foam product developed to meet the application of polyurethane soft foam in car steering wheels, armrests, bicycles, and motorcycle saddles.

The Jiangmen Economic Foam Factory tells you that according to the progress of raw materials, processing technology, and product development of polyurethane soft foam plastics, and the needs of business enterprises' specialization, the classification based on product service functions (such as soft foam, high semi-enclosed soft foam, heat-type soft foam, cold-mold soft foam, ultra-soft foam, anti-static soft foam, lipophilic soft foam, hydrophilic soft foam, water-absorbing soft foam, etc.) can still use different processing methods, namely prepolymerization method, reverse prepolymerization method, and one-stage traditional cultural classification method. The processing classification of polyurethane soft foam, namely prepolymer method, reverse prepolymer method, and one-stage classification, is another daily classification.