Commonly Plastic Welding Techniques Used Now
Plastic welding is actually welding for the semi-finished plastic materials and is also described as a process to unite softened material surfaces with the use of heat, except for solvent welding. There are three different stages of accomplishing the welding of thermoplastics and these are surface preparation, application of pressure and heat and lastly, cooling.
There are many different welding methods that are introduced and developed to join semi finished plastic materials. Welding methods for thermoplastics are actually considered as internal and external heating methods because it depends on the generated heat mechanism at the welding interface. In reality, there are countless of welding techniques that are being used for semi-plastic products which include the following:
Hot gas welding – this is also called as hot air welding which is a kind of plastic welding technique that is using heat. It is using special heat gun that’s called as hot air welder which produces jet of hot air that is softening both end parts that have to be joined and plastic filler rod.
Hot gas/air welding is a popular fabrication technique in manufacturing smaller items such as water tanks, plumbing fittings, heat exchangers and chemical tanks.
Welding rod – this is also called as thermoplastic welding rod that has a triangular or circular cross section which is used by welders when they need to bind 2 pieces of plastic together. They are available in different colors to be able to match the base color of material.
Say for example that the plastic welding rod has high porosity, then this can cause air bubbles or voids in the rod. At all cost, this should be avoided as it is decreasing the welding quality. For this reason, it is highly recommended to use plastic welding rods that have zero porosity or known to be voidless.
Heat sealing – in this process, it is sealing one thermoplastic to another similar to thermoplastic with the use of pressure and heat. Direct contact method for heat sealing with the use of constantly heated sealing bar or die in order to apply h eat to a specific path or contact area to either seal or weld the thermoplastic together.
There are various applications for heat sealing whether you believe it or not similar to foil sealing, heat seal connectors, thermally activated adhesives and film. Joining the PCBs to LCDs in countless of consumer electronics is the most popular application for the process of heat sealing but it can be used as well in telecommunications and medical devices. Heat sealing of products with the use of thermal adhesives is for holding clear display screens to consumer electronic products and at the same time, for other sealed thermo plastic devices or assemblies where heat staking or even ultrasonic welding is not a recommended option.