A filtration extruder, commonly referred to as a rubber filter extruder, is a type of rubber extruder. Typically, larger‑sized rubber extruders are used for filtration. In rubber product manufacturing, reclaimed rubber is often employed; however, even after de‑stone removal, this recycled material still contains numerous impurities—such as metal filings and nylon strands. If these contaminants are not removed and the material is fed directly into the production process, they can prevent normal processing or compromise product quality after extrusion. Therefore, filtration is essential prior to production. Before operation, the rubber filter extruder must be preheated to enhance the flowability of the rubber once it enters the screw barrel. The machine is usually equipped with a twin‑screw, co‑rotating feeding system that delivers the material. As the rubber enters the screw barrel, it is heated and plasticized, further improving its flow characteristics. The rubber is then processed by the screw; as the screw rotates, the plasticized compound continuously advances toward the die at the front of the extruder. A filter screen is installed at the die, allowing the molten rubber to pass through while retaining solid impurities. The filtered rubber is then discharged from the die and conveyed outside the equipment, leaving the contaminants trapped in the filter mesh. The production efficiency of a rubber filter extruder depends on the machine’s size: larger models deliver higher output. For this purpose, we typically use a 200‑type rubber extruder as the filtration unit.

The de‑stone machine for reclaimed rubber manufactured by Hebei Shuangda serves as the pioneering equipment for continuous high‑temperature, atmospheric‑pressure de‑stoning, and is a prerequisite for ensuring stable quality and superior performance in reclaimed rubber products. It enables rubber powder, activators, plasticizers, and other additives to undergo uniform blending within a three‑dimensional spatial structure under precisely controlled conditions. Following agitation by the mixing system, the rubber powder is further plasticized by the plasticizer, significantly enhancing product specifications and stability while reducing energy consumption.

It employs high-temperature, atmospheric-pressure plasticization, electromagnetic heating, a continuous production mode, and an automated control system. Featuring a single-screw split‑design, it ensures smooth polymer powder flow, uniform heating, stable product performance, safe operation, and simple handling.

Working principle of the rubber de‑stone machine: Based on the “rubber de‑stone reversion” mechanism, the waste rubber powder—premixed with additives according to the formulation—is heated during screw conveyance, enabling it to undergo “reversion and regeneration” under atmospheric pressure and high temperature conditions.

Equipment requirements for the rubber stone-removal machine process:

1. The equipment shall operate stably, and its installation, operation, and maintenance shall be simple and convenient.

2. The heating device operates stably, with a defined temperature rise range and an adjustable, controllable operating temperature.

3. The material is heated uniformly and consistently;

4. Allow sufficient time for the broken stone to be plasticized;

5. A relatively enclosed, plasticized space within the fractured rock mass;

6. Discharge cooling unit.

Features of the rubber stone-removal machine

1. Operates stably, with simple and convenient installation, operation, and maintenance;

2. The electromagnetic heating device operates stably, with a defined temperature rise range and adjustable, controllable operating temperatures; the temperature fluctuation is within ±1.5℃.

3. The outer tube and the helical shaft rotate in opposite directions, ensuring uniform and stable heating of the rubber powder and reducing the heating time.

4. Energy-efficient, highly automated, labor-saving, and low in operating costs;

5. This equipment can operate independently or in parallel, sharing a common feeding and discharging system to meet the requirement of increased production capacity.

Hebei Shuangda Rubber and Plastics Machinery Co., Ltd. is a modern enterprise integrating research and development, manufacturing, and sales of complete sets of extrusion equipment for rubber, silicone, and plastics. The company’s main products include rubber extruders, rubber hose extrusion lines, three‑layer composite sealing strip extrusion lines, silicone sealing strip production lines, plastic sealing strip production lines, plastic profile production lines, plastic pipe production lines, elastomer extruders, and other extrusion equipment, as well as production machinery for engineering seals, automotive seals, wire and cable applications, air‑conditioning hoses, braided hoses, automotive hoses, waterstop strips, and related products.