Plastic bonding method

In general, plastic is bonded by using screws, nuts, bolts, or adhesives.
From the environmental viewpoint, however, the use of screws and nuts/bolts requires the disassembling of the plastic product and sorting disassembled materials, while adhesives generate volatile organic compounds (VOC) even after the drying of the adhesive and may cause toxic gas to be generated when incinerated.

Is there any other method besides screws and adhesives for the bonding of plastics?
The answer is yes, and it is the heat welding method, which adequately utilizes the properties of thermoplastic resin (heating -> melting / cooling -> solidifying).

Suppose you want to join two pieces of chocolate together. If you melt the portions to be joined by heating, make both pieces come into contact with each other, manually press them, and wait until they are cooled down, the joined pieces will turn into a single piece of chocolate. Concerning plastic, adhesive works like chocolate melted by heat, meaning that this method is environmentally friendly.

These types of heat welding methods have been widely employed in recent years, and conventional heat welding methods include hot plate welding, vibration welding and ultrasonic wave welding.

- Hot plate welding
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- Vibration welding
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- Ultrasonic wave welding

What is laser transmission welding?
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