Frequently Asked Questions from Overseas Customers About Membrane Filter Presses (Automation, Operation & Maintenance, and Commercial Matters)

Q5: What level of automation can be achieved? Our labor costs are high.

Current mainstream configurations can achieve full PLC automatic control: automatic plate closing, automatic feeding (switching by time or pressure), automatic squeezing, automatic plate release, and automatic plate shifting for cake discharge—one operator can monitor multiple machines simultaneously. A vibratory cake discharge device is also available as an option to reduce manual intervention caused by cake sticking to the filter cloth. However, it is advisable to clarify several details at the inquiry stage: whether plate shifting is variable-frequency or fixed-speed, whether cake discharge detection provides position feedback, and whether squeeze pressure is manually set or closed-loop regulated. If the on-site compressed air quality is poor (containing water and oil), the failure rate of pneumatic components will rise; a refrigerated dryer and filters are necessary additional investments—do not cut corners on this.

Q6: How often does the filter cloth need replacement? Is it very expensive?

Filter cloth is a consumable; service life can range from a few weeks to a year or two, depending on the abrasiveness and chemical corrosiveness of the material and the cleaning frequency. When selecting, do not look only at price—confirm whether the material (PP, polyester, nylon, etc.), permeability, and weave pattern match your material. A practical suggestion: ask the supplier for both the filter cloth replacement cost and a recommended spare parts list, and incorporate the unit price and estimated annual replacement quantity into your operating cost calculation. In addition, the installation quality of the filter cloth greatly affects its life—wrinkles or material trapped in the sealing surface will cause premature local damage. It is worthwhile to have the supplier provide on-site guidance or a video tutorial for the first installation.

Q7: After the equipment arrives, can you send someone for installation and commissioning? What about spare parts?

Overseas customers should pay particular attention to this point. Before signing the contract, clarify: whether on-site installation guidance and commissioning are included, how dispatch costs are calculated, how long commissioning takes, and whether operator training is included. Regarding spare parts, membranes, filter cloth, and seals are the three major wear parts; it is recommended to stock a batch equivalent to one year's usage in the initial purchase to avoid downtime while waiting for parts. Also confirm whether the supplier has an agent or spare parts warehouse in your region; if not, at least require drawings and specifications of key components so that alternative parts can be sourced locally (note, however, that alternative parts may affect the warranty). For payment, if trading through a platform, try to use secured methods such as Trade Assurance or a letter of credit; for large orders, consider third-party factory inspection.

Q8: Our site space is limited—is a membrane filter press much larger than a standard machine?

The main equipment dimensions are not very different, since the filter plate outline dimensions are similar. However, a membrane filter press requires additional auxiliary systems: air squeezing needs an air compressor and receiver tank (or water squeezing needs a high-pressure pump and water tank), and these take up space. In addition, a fully automatic configuration requires space for the hydraulic station and control cabinet. In the inquiry sent to the supplier, it is best to attach the available footprint and height restrictions, and require the supplier to provide a layout drawing showing interface locations. If space is genuinely tight, you can ask the supplier whether the squeeze medium system can be integrated on the side of the machine body or whether a compact hydraulic station can be used—some manufacturers have designs tailored to this.