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With China Plastic Machinery
With China Plastic Machinery
Polypropylene foam (PP foam for short) is a high-performance cushioning material. It is widely used in cushioning packaging for furniture, paneling, high-end instruments and metal utensils with smooth surfaces because of its good protective performance on smooth surfaces. In addition, it can also be used as thermal insulation packaging for hot foods, as well as cushioning materials such as pads and linings.
Polypropylene foam is made of polypropylene resin as the main body, with foaming agent and other additives added. This material has good mechanical strength and shows excellent tensile strength, flexibility, elasticity and friction coefficient. It has good wear resistance and can effectively prevent the sliding of smooth surfaces in contact with it. At the same time, PP foam has a low density, excellent thermal insulation performance, and is non-toxic and odorless. However, it has poor stability to light.
The molding of PP foam usually involves three types: mechanical foaming, physical foaming and chemical foaming. Mechanical foaming uses mechanical stirring to introduce gas to form bubbles, physical foaming relies on the change of the state of the foaming agent to produce bubbles, and chemical foaming releases gas through the chemical reaction of the foaming agent to achieve foaming. PP foam plastics mainly use chemical foaming. Common foaming agents include azodicarbonamide, diisopropyl azodicarboxylate, etc., and nitrogen can also be used for physical foaming. The foaming process of foam plastics is roughly divided into two stages: first, a uniform and fine bubble nucleus is formed, then it is expanded into the required foam structure, and finally it is solidified.
Extrusion molding is one of the main molding methods of PP foam plastics, which is suitable for a variety of foam products such as profiles, plates, and pipes. In extrusion molding, physical foaming or chemical foaming can be used. Fluorocarbon compounds and their mixtures, as well as other low-boiling point liquids, are commonly used for physical foaming, and sometimes gas is directly injected. The key process parameters of extrusion molding include extrusion pressure, extrusion temperature, the residence time of the material in the extruder, and the axial pressure of the die. Changes in these parameters will affect the size and distribution of the bubbles.
Injection foam molding is an efficient one-step molding method, especially suitable for products with complex shapes and high dimensional accuracy. The quality of this method is affected by material formulation, molding equipment and process conditions. Among them, process conditions such as pressure, temperature and time are crucial to the performance of the product. The adjustment of pressure and temperature can directly affect the formation and stability of bubbles.
Compression molding is also a molding method for PP foam plastics, which can be divided into one-step method and two-step method. The one-step method completes the foaming process at one time, while the two-step method foams twice to increase the foaming multiple. The specific method of compression molding can be determined according to the raw materials and products.
BASF's Neopolen P series PP foam plastics have spherical particle morphology and are mainly composed of non-cross-linked closed cells. This type of product is light in weight, has a strong ability to absorb impact loads and quickly recovers to its original state. Their ability to resist deformation is not limited by direction, they have low water absorption, good corrosion resistance, and outstanding heat resistance and thermal insulation properties. The product density range of the Neopolen P series is 20-85 kg/m3. It does not contain harmful foaming agents such as Freon and can be reused under certain conditions. Clean recycled materials can be used for injection molding or extrusion.
PP foam plastics are widely used in the automotive manufacturing industry, such as bumper cores, side guards, etc. As a packaging material, it can protect fragile items and precision instruments. In terms of safety protection, it can be used to manufacture safety helmets. In addition, it is also commonly used as thermal insulation and sound insulation materials in the construction industry. The demand for PP foam plastics has been growing year by year around the world, and JSP has a significant share in many markets, especially in the field of automotive parts.
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