[Product Introduction]
The PLD Flat Type Bag Centrifuge is an innovative solid-liquid separation machine independently developed by Jiangsu Shengli Centrifuge Manufacturing Co., Ltd. on the basis of conventional scraper-discharge centrifuges. After scraper discharge, a residual cake layer (the so-called "heel cake") always remains on the bowl wall of traditional machines, compromising product purity in the next batch and creating risks of cross-contamination and batch-to-batch variation. While retaining the high discharge efficiency of scraper technology, the PLD incorporates a liftable filter bag inside the bowl: during discharge, the bag is pulled down and oscillates reciprocally, detaching the residual cake layer quickly and completely. The result is genuinely automatic, residue-free discharge-an ideal machine for API crystallization separation and high-value material recovery.
[Working Principle]
When the discharge cycle begins, the scraper first removes the bulk of the cake through the blanking holes at the bottom of the bowl. The remaining layer is then eliminated by the automatic bag-pulling mechanism inside the bowl, which generates an oscillation effect that thoroughly clears the residue before the bag automatically resets for the next cycle. The machine uses variable-frequency speed control and fully automatic PLC control; bag lowering and resetting are completed automatically without operator intervention. Large-flip or fully flip-open housing versions are available for thorough inspection and cleaning.
[Product Applications]
Widely used in pharmaceuticals, fine chemicals, food additives, dyes, and pesticide intermediates wherever strict cleanliness and residue control are required. It is especially suitable for heat-sensitive, adhesive, or high-value crystalline and granular materials, such as cephalosporin and penicillin APIs, pharmaceutical intermediates, fine chemicals, food-grade crystalline salts, and high-value dyes and pigments.
[Industry Application Cases & Market Insights]
In the international market, residue-free discharge and crystal protection have become core purchasing criteria for pharmaceutical-grade centrifuges. Market research indicates that API processing accounts for approximately 45% of pharmaceutical filtration centrifuge applications, and bag-pulling (inverting) centrifuges are widely adopted for slow-filtering, compressible cakes and highly potent APIs (HPAPI) thanks to their scraper-free, heel-free operation and low crystal breakage. Leading international brands in this category command premium prices and long lead times; the PLD series from Jiangsu Shengli Centrifuge Manufacturing Co., Ltd. offers benchmark technical performance with a decisive cost advantage, providing an import-substitution solution for pharmaceutical and fine chemical customers at home and abroad, and has entered multiple overseas markets through the company's established export network.
[Key Advantages]
Fully automatic bag-pulling discharge completely removes the heel cake every cycle, eliminating cross-contamination between batches.
Oscillating bag stripping replaces manual digging, keeping crystal breakage low and product yield high.
Variable-frequency speed control with adjustable separation factor adapts to diverse materials and processes.
Large-flip or fully flip-open housing allows easy internal inspection, cleaning, and filter cloth replacement.
PLC program control ensures stable operation and unattended running.
Optional nitrogen protection with online oxygen detection for explosion-proof duties involving flammable solvents.
[Selection & Customization Services]
Jiangsu Shengli Centrifuge Manufacturing Co., Ltd. provides customized designs based on customer material characteristics: product-contact parts in SUS304, 316L, 904L, duplex steel, titanium, or Hastelloy; filter cloths in nylon, polypropylene, polyester, or PTFE matched to particle size and chemical compatibility; and GMP-compliant design with CIP clean-in-place systems. Customers are welcome to send material samples for bench-scale testing in the company's materials laboratory, so that the optimal machine model and process parameters are determined by data.
