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In the process design of Over Moulding, the key elements are anti-backlash device, nozzle hole, air outlet and surface texture of mould.


The anti-backlash device between the base material and the covering material is crucial for the bonding effect. It is necessary to avoid the gradual thinning or bristling of the ejected covering material. Covering material is too thin, which can lead to poor adhesion, degumming and edge rolling. Good anti-backlash device design should clearly separate the covering material from the base material.


The design of nozzle hole is also important for the success of Over Moulding. The ratio of runner length to wall thickness is the main factor affecting the bonding effect. According to experience, the ratio should not exceed 150:1, and should be kept at about 80:1 when developing new process design. In order to shorten the process as much as possible, the perforator should be set at the position with the greatest wall thickness. When using TPE resin, attention should be paid to the size of nozzle aperture. TPU and other materials need large diameter nozzles to adapt to higher viscosity and prevent material degradation due to excessive shear stress. Materials such as SEBS need a higher shear rate to obtain the best flow rate. A better way is to use small-caliber nozzles in the initial stage and adjust the nozzle size after the first sampling. Like the perforator, the outlet is also an important factor affecting the bonding effect. How to control the air margin is a big problem. If the control is not good, the phenomenon of weak bonding and filling the edge may occur. Depth of the outlet is critical to prevent rough edges. Depending on the viscosity of the covering material, the depth of the outlet should be between 0.0005 and 0.001 inches.


Application

  • Automotive
    Automotive

    Sheet molding compound (SMC) mold can be used to manufacturing parts of cars, buses, trucks, transport and special vehicles.

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  • Energy/Power Generation
    Energy/Power Generation

    BMC and SMC are used to make xenon lamp HID luminaires because they can withstand the high temperatures that luminaires can withstand.

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  • New Energy Vehicle
    New Energy Vehicle

    Sheet molding compound (SMC) mold can be used to manufacturing parts of new energy vehicle.

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  • Transportation Equipment
    Transportation Equipment

    BMC and SMC are used to make outdoor large-scale transportation equipment bearing housing, bearing cover, sealing ring, non-oxidizing.

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  • High-speed Rail
    High-speed Rail

    The bulk molding compound (BMC) and sheet molding compound (SMC) are different from these materials.

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  • Building Materials
    Building Materials

    Our BMC ceiling and wallboard materials have been developed for more than ten years, and the technology is constantly being updated.

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  • Ship
    Ship

    Sheet molding compound and bulk molding compound are widely used for Ship. Click here for more info about the SMC & BMC material.

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  • Electrical Appliances
    Electrical Appliances

    BMC can be used for household appliance, such as frying pan lids and brackets, as well as kitchen component materials such as oven endplates.

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  • Motor
    Motor

    BMC plastic motor mold replaces the traditional iron shell and aluminum products, reduces the process, stronger sealing, higher safety factor, less noise.

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  • High And Low Voltage Electrical Switch
    High And Low Voltage Electrical Switch

    BMC & SMC is used to make parts with resistance to electrical marks greater than 600 minutes and arc resistance greater than 180 seconds.

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  • Outdoor Supplies
    Outdoor Supplies

    The fuel cell industry uses a large number of thermoset materials to make two plates. BMC and SMC are also suitable for use in solar tile and wind turbines.

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