Membrane Filter Plate Welding Machine

      A filter press plate welding machine, including a frame, an upper mould fixing device, a bottom mould fixing device and a hot mould device, said upper mould fixing device including an upper edge positioning structure and an upper filter press plate middle clamping structure; said bottom mould fixing device including a lower edge positioning structure and a lower filter press plate middle support structure; the solution of the present invention makes the upper and lower filter press plates to be processed to be fixed around, and the middle part of filter press plate to be welded by the lower filter press plate middle support structure of the bottom mould fixing device, and the upper mould fixing device. The solution of the present invention uses the lower edge positioning structure in the bottom mould fixing device, the lower edge positioning structure in the upper mould fixing device, the upper edge positioning structure in the upper mould fixing device, and the upper filter press plate middle clamping structure, so that the upper and lower filter press plates to be processed can be fixed in all directions when the filter press plate is welded, and the middle part of the filter press plate can be welded to be completely combined together through the lower filter press plate middle supporting structure and the upper filter press plate middle clamping structure, and the completion of this step is carried out by the machine automatically, realising the automation of the production and guaranteeing the quality of the product. This step is done automatically by machine, which realises the automation of production and also ensures the quality of the product.

How to Make High-Performance Membrane Filter Plates: The Professional Manufacturing Process

A membrane filter plate is significantly more complex to manufacture than a standard chamber plate. It consists of a support core and two flexible membranes that must be perfectly fused to withstand high squeezing pressures (up to 25 bar).

At Bestcome, we provide the industry-leading Heat Fusion Welding Technology required to produce leak-proof, high-durability membrane plates. Here is the step-by-step professional manufacturing process.

Step 1: Material Selection & Injection Molding

The process begins with high-quality Virgin Polypropylene (PP).

• The Core: The center support plate is injection molded to provide structural rigidity.

• The Membranes: Two flexible PP sheets are molded separately. These will act as the “diaphragms” that squeeze the filter cake.

Step 2: CNC Precision Machining

Before welding, the sealing surfaces and the welding grooves of both the core and the membranes are machined using high-precision CNC centers.

• Why it matters: Surface flatness must be within $\pm 0.1\text{mm}$ to ensure a uniform weld. Any deviation will lead to high-pressure leaks or “membrane blowouts” during operation.

Step 3: The Core Process – Heat Fusion Welding

This is where the Bestcome Filter Plate Welding Machine plays the most critical role. Unlike glue or mechanical fastening, heat fusion creates a molecular bond between the materials.

1. Alignment: The core and membrane are placed into the welding machine’s precision jigs.

2. Heating: A specialized heating plate is inserted between the two surfaces, heating the PP to its exact melting point (approx. $230\text{°C} – 260\text{°C}$).

3. Fusion: The machine applies controlled hydraulic pressure to press the molten surfaces together.

4. Cooling: The bond is held under pressure until it solidifies, creating a monolithic structure that is as strong as the original material.

Step 4: Edge Trimming & Finishing

After welding, any excess “flash” (melted plastic pushed out during fusion) is trimmed using automated cutters. This ensures the outer dimensions of the plate perfectly match the filter press rails.

Step 5: High-Pressure Leak Testing

Every membrane plate must pass a rigorous pressure test.

• Internal Inflation: Air or water is pumped into the hollow chamber between the core and membrane.

• Pressure Holding: The plate must hold 1.5 times its rated operating pressure for a set duration without any drop in gauge pressure or visible deformation.

Why the Bestcome Welding Machine is the Best Choice for Manufacturers?

If you are setting up a filter plate production line, the welding quality determines your brand’s reputation. Our machines offer:

Build Your Own Filter Plate Production Line

Are you looking to produce high-quality membrane plates for the mining or chemical industry? Bestcome Machinery provides not just the equipment, but the complete technical know-how.

Our Welding Machine Solutions Include:

• Customized jigs for all plate sizes ($800\text{mm}$ to $2000\text{mm}$).

• On-site installation and operator training.

• Formula guidance for PP material mixing.

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