This type of welding is also considered as a through transmission welding. It is a procedure of merging plastic materials with the use of laser radiation. Its process is much more complex compared to the usual metal welding we have known. In laser plastic welding, it involves having a focal lasering beam to pass through a transmissive part which interfaces two surfaces to be joined as one.
Before being welded, joined components are situated together after which are pressed collectively. During the merging process, light beam enters the translucent component with the absence of materials getting heated up. This is due to the components responsible for absorbing the heat, thus, only makes the surface heated.
The energy is then transferred through heat conduction on the surface of the clear components of the laser transmission plastic welding. The absorbent material plastifies the plastic which causes the merging of materials. The sturdiness of its outcome usually depends on the strength and firmness of base material that is being utilized.
To be more specific, let us dive into its process factors. This heavily depends on the four major factors namely, a transmissive layer, absortion layer, material propriety, and a firm contact of both parts. For the primary layer, infrared ray radiation are conveyed by natural thermoplastics to transmit energy to its subordinating sphere.
Next to it is the layer of absorption. It is assigned to transform the light energy to turn into heat. Most of the thermoplastics are transferable to IR radiation which needs additives to attain absorption qualities. Many often uses carbon black as it holds things well which also includes fillers and a variety of pigments.
In terms of material propriety, materials are identified by several factors such as the polymer chain length and the surface energy. However, remember that the most vital factor is to determine plastics that are having overlapping or same melting temperatures to achieve the results you desired to have.
Following next is the contact made. Right after light is transformed to being a thermal energy at the lower layer, excess force has to make a path all the way to top layer to achieve melting occurrence in both materials. When you established a great contact, a firm and clenching force is put into application to the different parts of thy item.
There are a lot wrong perceptions that lasering based welding plastics needs one transparent part, and the other is opaque. Yet what others do not know is you can actually weld both same kinds and the opposites. You could either use methods like Clearweld. It can be used as a coating or additive and absorbs radiation.
Aside from clear to clear merging, you can also join two opaque parts. To achieve a black part, plastics are drugged with carbon black. However, the ingredient is a high absorber of infrared which hinders transmission in the upper layer. So, others opted to using a green or ultra red dye to get a visually black output. You could use other opaque colors as well.