The working principle of the fully automatic rail-mounted PVC film material heat sealing machine

1. Core principle: high-frequency dielectric heating technology
The fully automatic orbital PVC film heat sealing machine excites the polar groups in the PVC molecules through a high-frequency electromagnetic field (27.12MHz or 40.68MHz), causing them to oscillate at a high speed following the direction of the electric field at a speed of millions of times per second. This high-frequency vibration causes intense friction between molecules, converting electrical energy into thermal energy, so that the PVC film material reaches a molten state within 0.5-3 seconds (temperature range 150-220℃). Compared with traditional heat conduction heating, the heating speed of this technology is increased by 5-8 times, and the heat-affected zone is limited to the joints of the film material to avoid overall deformation.

Technical advantages:

Penetrating heating: It can penetrate PVC film materials with a thickness of 0.1-5mm to achieve synchronous melting of the surface and inside.
Concentrated energy density: The heating power per unit area reaches 10-30kW/cm², ensuring welding strength.
Wide material adaptability: Compatible with pure PVC, PVC/PU composite film, and mixed materials containing more than 20% PVC (such as PVC/TPU, PVC/EVA).
2. Track-type automatic welding system
The equipment adopts a track travel mechanism driven by a servo motor, combined with a high-precision linear guide rail to realize automatic control of the welding path. Its working process is as follows:

Membrane positioning: The PVC membrane material is fixed by a vacuum adsorption platform or a mechanical fixture, with a positioning accuracy of ±0.1mm.
Automatic travel: The servo motor drives the welding head to move along the preset track, with an adjustable speed range of 1-7 meters/minute, supporting straight line, arc and three-dimensional curved surface welding.
Pressure control: The pneumatic or hydraulic system provides an adjustable pressure of 0.1-5MPa to ensure full contact of the membrane material during welding.
Cooling and shaping: After welding is completed, the air cooling or water cooling system is used to quickly cool down the joint so that it can be cured and shaped within 2-5 seconds.
3. Industry application and selection suggestions
Application scenarios:
Inflatable amusement equipment: large inflatable castles, water park facilities.
Membrane structure buildings: stadium domes, exhibition hall curtain walls.
Industrial fields: windproof roller shutters, soft film ceilings, industrial belt skirt welding.
Core selection indicators:
Welding speed: For large-scale projects, it is recommended to select equipment ≥5 meters/minute.
Temperature uniformity: Equipment with a closed-loop feedback system is preferred to reduce the scrap rate.
After-sales service: Response speed (domestic manufacturers ≤24 hours).