Plastic laser welding makes plastic connections stronger, more beautiful and more precise!

With the development of industry, resin degradation is reduced, fragments are reduced, and metal products can be replaced; in the electronics industry, medical industry, food packaging, consumer electronics industry, and automotive industry; the connection between plastics is particularly important, and laser welding technology is stronger, more beautiful, and more precise than the connection.

1. Plastic Classification

Plastic:Literally means plastic material, with resin as the main component, and appropriately added (or not added) additives (fillers, plasticizers, stabilizers, pigments, etc.). ), can be formed under a certain temperature and pressure, and the product can eventually keep its shape at room temperature.

Thermoplastics: soften or even flow when heated, cool and harden. This process is reversible and can be repeated; in thermoplastics, the resin molecular chain is a branched or branched structure, there is no chemical bond between the molecular chains, and it softens and flows when heated. The physical change is the process of cooling and hardening.

Thermosetting plastics: The first heating can soften and flow, and when heated to a certain temperature, a chemical reaction chain solidifies and hardens. This change is irreversible. Then, when heated again, it no longer flows softly. Thermosetting plastic resin solidifies linearly or with chains. Chemical bonds are formed between the solidified molecular chains to form a three-dimensional network structure, which can neither melt nor dissolve in solvents. In other words, it is insoluble.

2. Trend of plastic welding

• Plastics are widely used in various industrial fields

• The demand for plastics in industrial production has gradually approached or even exceeded that of steel

• The traditional plastic joining methods mainly include: gluing, friction welding, ultrasonic welding, hot melt welding, etc.

• Laser transmission welding is a new type of plastic joining method

3. Laser plastic welding

Laser plastic welding principle: Compared with other commonly used welding technologies, laser welding technology produces almost no welding slag and debris, and does not require any adhesive to be added during the welding process, so the entire welding work can be completed in a clean room.

• Use lap or quasi-lap joints for transmission welding;

• Laser transmission welding can be achieved for thermoplastics;

• The transmittance of the upper test panel should be at least 20%;

• The lower test panel has a strong absorption capacity for laser.

Fourth, the advantages of laser plastic welding

1. Non-contact welding, no vibration welding

2. Flexibility, easy to cooperate with the production line

3. No pollution during welding, clean surface

4. Small thermal damage and thermal deformation

5. High degree of equipment automation

6. Strong weld and good sealing