There are significant differences between the extrusion and molding processes of phenyl rubber compound in the molding principle, equipment structure, product characteristics and applicable scenarios. The specific analysis is as follows：


1. Molding principle and process flow
Extrusion process
Through the rotation of the screw of the extruder, the phenyl rubber compound is heated and plasticized in the barrel, and at the same time it is pushed forward continuously through the nose and mouth mold, and finally made into continuous products such as pipes, strips or special-shaped profiles.The process flow includes：
Plastic refining: The rubber material is heated and softened in the extruder；
Extrusion molding: The screw pushes the rubber material through a specific die to form the desired cross-sectional shape；
Cooling and curing: The product is shaped by sink or air cooling.
The process can be continuously produced and has high efficiency, but the shape of the product is limited by the mouth mold, and it is mostly tubular.
Molding process
The powdered flakes or pellets of phenyl compound rubber billet are placed in the cavity of the closed mold, and it is cured or vulcanized by heating and pressurization, and the product is finally released.The process flow includes：
Billet preparation: Pre-press the rubber material into a shape similar to the finished product；
Closed mold pressure: Pressure is applied to the flat vulcanizing machine to fill the mold with rubber and cure it；
Release and trimming: Remove the flying edges to obtain the final product.
This process is suitable for the production of products with complex shapes and high dimensional accuracy requirements, but the production cycle is long.
2. Comparison of product characteristics
Characteristic extrusion process molding process
Shape restrictions are limited to tube strips or simple cross-section products, which can produce any complex shape, such as sealing rings and gaskets.
The dimensional accuracy is low, the surface finish is generally high, the surface is smooth, and the mechanical properties are stable.
The length limit is unlimited, and the continuous production is limited by the size of the mold, usually small and medium-sized products.
The internal stress and deformation internal stress are high, easy to warp and deform, the internal stress is low, and the warping deformation is small.


3. Applicable scenarios and advantages and disadvantages
Extrusion process
Advantages: High production efficiency, continuous production, low scrap rate, multi-purpose in one machine (a variety of products can be produced by replacing the screw and head).
Disadvantages: The product has a single shape and a complex structure that is difficult to achieve; the accuracy is low and subsequent processing is required.
Applications: construction industry (sealing strips), automotive aviation (pipes), electronic equipment (cable coating), etc.
Molding process
Advantages: The product has high shape complexity, high dimensional accuracy, and stable mechanical properties; it is suitable for mass production of small and medium-sized composite products.
Disadvantages: The mold making cost is high and the development cycle is long; the product has thick flying edges and requires additional trimming; the production efficiency is low.
Applications: industry and agriculture (structural connectors), transportation (oil seals), electrical and chemical industry (insulation parts), etc.
Fourth, process selection suggestions
Choose the extrusion process: if you need to produce long-size, tube-shaped or simple cross-section products, and are sensitive to cost and production efficiency (such as large-scale construction sealing strip production).
Choose the molding process: if you need high-precision, complex-shaped products (such as low-temperature-resistant seals, electrical insulation parts), and can accept higher mold costs and longer development cycles.