Hot Plate Welding Molds

Hot Plate Welding Molds

Heat the contact surface of plastic workpieces through a hot plate to melt them, then fit and press to achieve the welding of thermoplastic materials (such as butt welding, lap welding). It can also be used for thermoforming, edge banding or local hot-melt bonding of plastics.

Extremely high welding strength. The entire welding surface melts and bonds simultaneously, and the weld strength can reach more than 80% of the raw material strength.

A significant advantage of hot plate welding compared to ultrasonic welding: the surface of Hot Plate Welding Molds can be processed into any complex 2D or 3D curved surface, so it can weld extra-large workpieces with irregular shapes and non-planar welding lines.

Excellent sealing performance. It can achieve perfect airtight and watertight sealing, suitable for container products.

During the heating and pressure-holding stages, Hot Plate Welding Molds (or matching fixtures) need to apply uniform and controllable pressure to the workpieces. During heating, the pressure ensures full contact between the workpiece and the surface of the hot plate mold, guaranteeing heat conduction efficiency. During welding, the pressure promotes the extrusion and fusion of the two molten plastic surfaces, and discharges air and excess molten material to form a dense weld.

Molding and shaping. The shape of the contact surface of Hot Plate Welding Molds directly determines the shape and depth of the workpiece's melting area. A well-designed mold can ensure consistent melting depth, laying a foundation for forming high-quality welds. In the subsequent pressure-holding and cooling stage, the mold (usually the lower mold or special fixtures) also plays a supporting and shaping role for the workpiece, ensuring that the product does not deform during the cooling process.

Realizing welding of complex contours. This is a significant advantage of hot plate welding compared to ultrasonic welding. The surface of the mold can be processed into any complex 2D or 3D curved surface, so it can weld extra-large workpieces with irregular shapes and non-planar welding lines. For example: automotive tail lights, battery casings, large water buckets, plastic furniture, etc. The welding contours of these products are often curves or irregular planes, and the hot plate mold can perfectly fit.

Strong adaptability to materials. Especially suitable for welding different types of plastics (such as ABS and PC) or engineering plastics with high glass fiber content, which often have poor results with ultrasonic welding.

 

 

 

 

 

 

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