LSR liquid silicone mold flow channel design need to pay attention to what problems

LSR liquid silica gel mold flow channel design is an important link in liquid silica gel molding process, it directly affects the product quality and production efficiency. In the design of LSR liquid silicone mold flow channel, the following issues need to be paid attention to:

The rationality of liquid silicone mold flow channel design:

The flow path should be designed to ensure that the liquid silicone can fill the mold cavity evenly and quickly. The size and shape of the flow path are critical to the injection molding process of the LSR mold. The size of the flow path should ensure that the LSR material flows evenly during injection and does not generate excessive shear heat. The shape of the flow channel should avoid sharp turns and mutations as much as possible to reduce the resistance and pressure loss of the fluid.

Liquid silicone mold flow channel balance:

When designing the flow path, it is necessary to ensure that the liquid silicone can fill all parts of the mold at the same time to avoid uneven filling caused by the sequence. In order to achieve the balance of the flow channel, diverting channels and multiple gates can be used to make the liquid silica gel evenly distributed in the mold cavity. The length and proportion of the runner should be determined according to the specific mold design and the flow characteristics of the LSR material. Too long a flow path will increase the injection pressure and time, while too short a flow path may cause uneven flow or bubble formation.

The number and distribution of liquid silicone mold runner:

The number and distribution of the flow channels should be reasonably designed according to the shape and size of the mold cavity and the fluidity of liquid silica gel. When designing the flow path of the LSR mold, it is necessary to consider the flow path and filling sequence of the material to ensure that the mold can achieve uniform filling and reduce the generation of bubbles. Reasonable flow channel layout can improve molding quality and production efficiency.

Temperature control of liquid silicone mold runner:

Liquid silicone needs to maintain a certain temperature range during the molding process to ensure its fluidity and molding quality. Therefore, the problem of temperature control needs to be considered when designing the flow path. The temperature of the liquid silicone can be precisely controlled by setting heating or cooling elements in the flow path.

Liquid silicone mold runner cleaning and maintenance:

When liquid silica gel flows in the flow channel, it may carry some impurities or residues, which may affect the molding quality of liquid silica gel. Therefore, when designing the runner, it is necessary to consider the cleaning and maintenance of the runner. The flow path surface of the LSR mold should be properly treated to reduce friction resistance and prevent material adhesion. Common treatment methods include polishing, sandblasting and coating.