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Plastic laser welding for the welding object for thermoplastic plastic materials, thermoplastic plastic materials are mainly divided into two categories, one is amorphous plastic, without color masterbatch performance for transparent materials, such as PC, PMMA and other materials; The other kind is semi-crystalline plastic, without color masterbatch performance for milk white or milk yellow material, such as PA, PBT.
For the upper laser penetration layer of the plastic, all the color plastic without color masterbatch is transparent to the laser of 800-1000nm. If an amorphous material is used, there is no specific thickness requirement. If semi-crystalline materials are used as the laser penetration layer, generally speaking, the thickness of the penetration layer plastic in the welding area should not exceed 2mm. The addition of glass fiber has a certain influence on the laser penetration. The more glass fiber percentage is added, the thickness of the plastic design of the laser penetration layer should be as small as possible.
For the lower layer of absorbent plastic, ordinary black plastic can be.
Many customers ask about welding between color plastic combinations. Generally speaking, the difficulty and cost of welding follow the following table:
The simplest is to use the natural color transparent plastic welding on the black absorbent plastic, laser plastic welding process is the simplest, the lowest cost. The most commonly used combination of auto parts welding application is the black light-penetrating plastic laser welding on the black light-absorbing plastic, the difficulty is to use the black laser penetrable plastic, in the selection of materials, the laser penetrant must use the laser penetrable plastic with qualified light transmittance.
One of the more difficult is laser welding between coloured plastics. Although companies can currently develop coloured laser penetrable masterbatches, they are still too expensive for mass production and are not recommended.
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