Screws for plastic injection and back flow valves

Screws and back flow valves for plastic injection require BÖHLER steels with exceptional wear, corrosion, and fatigue resistance. Key quality features include ultra-clean materials, full traceability, controlled heat treatment, and rigorous testing for maximum service life and processing reliability.

Screws for plastic injection moulding and back flow valves are among the most critical wear components in polymer processing. They operate under high mechanical loads, elevated temperatures, aggressive additives, and, in many applications, highly abrasive fillers such as glass fibers, mineral reinforcements, or flame-retardant compounds. Material requirements therefore focus on exceptional wear resistance, corrosion resistance, compressive strength, and fatigue performance. In addition, dimensional stability and surface integrity are essential to ensure homogeneous melt preparation, consistent shot volumes, and reliable long-term processing performance. Back flow valves are exposed to continuous friction, pressure pulsation, and repeated opening and closing cycles, requiring excellent toughness combined with outstanding resistance to adhesive and abrasive wear.

BÖHLER high-performance steels and alloys are specifically engineered to meet these demanding plastics processing requirements. Advanced tool steels, powder metallurgical grades, and corrosion-resistant alloy steels provide an optimized balance of hardness, toughness, and wear resistance. Produced using advanced melting, remelting, and powder metallurgy technologies, BÖHLER materials offer exceptional cleanliness, low inclusion content, and homogeneous carbide distribution, ensuring predictable performance and extended service life. Key quality features include strict chemical composition control, certified traceability, validated heat treatment processes, and consistent hardness profiles. Comprehensive quality assurance through wear testing, microstructural analysis, corrosion evaluation, and non-destructive inspection ensures reliable operation. BÖHLER materials help processors increase productivity, reduce maintenance intervals, and achieve superior processing consistency in demanding injection moulding applications.