EPS mold (polystyrene foam mold) and EPP mold (expanded polypropylene mold) are two widely used molds in the field of plastic molding. The following is an introduction to them:

Material properties

EPS material: It has the characteristics of light weight, heat insulation, sound insulation, shock absorption, etc., and is easy to process and mold, and has low cost. However, its strength and toughness are relatively weak, and its impact resistance is average.

EPP material: It has higher strength, toughness and impact resistance, as well as good elasticity and wear resistance, strong recyclability, and good chemical stability, but the cost is relatively high.

Mold type

EPS mold: It includes block molds for making large foam boards, shape molds for producing products of specific shapes, lost molds used in the casting field, and insert molds that can be embedded in other materials.

EPP mold: It mainly includes ordinary molding molds for customizing products of various shapes, multi-layer molds for making complex structure products, and multi-cavity molds that can improve production efficiency.

Application fields

EPS mold: commonly used in the packaging industry, such as cushioning packaging for electronic products and home appliances; production of thermal insulation boards in the construction field; and manufacturing of some interior parts and packaging materials in the automotive industry.

EPP mold: widely used in the manufacture of bumpers, seats, interior parts, etc. in the automotive industry; in the packaging field, it is used for shockproof packaging of high-end electronic products, precision instruments, medical devices, etc.; it can also be used in sports equipment, toys, aerospace and other fields.

Manufacturing process

EPS mold: firstly, the mold is designed through CAD, and then aluminum, steel and other materials are selected according to the needs, and the mold is manufactured by CNC processing and other methods, and then the surface treatment is carried out to ensure the finish, and finally debugging and inspection are carried out.

EPP mold: the design process also uses CAD/CAM technology, and the materials are mostly high-strength aluminum alloy or steel, and are manufactured by precision processing technology. After the manufacturing is completed, strict surface treatment and quality inspection are also required to ensure the accuracy and performance of the mold.