I. Product Overview This 48-cavity side-gate hot runner system is specifically customized for the injection molding of medical laboratory pipette tips. It is suitable for medical-grade PP raw materials and compatible with the mass production of conventional non-filter/filter-equipped pipette tips of 10μL, 200μL, and 1000μL. Adopting a side-hidden gating structure, it perfectly avoids the appearance of the inner and outer walls of the tip and the sealing working surface, meeting the high-standard requirements of medical consumables such as no burrs, no stringing, smooth inner walls, and no residues. It is suitable for high-speed automated injection molding production in clean workshops and is a special hot runner solution for multi-cavity high-precision medical consumables. ### II. Compatible Materials and Production Standards - It is specially designed for medical-grade PP raw materials and meets the molding requirements of USP Class-VI materials for medical consumables. - The system's temperature control is tailored to the low-temperature melting characteristics of PP, effectively preventing material carbonization, yellowing, and the generation of black spots, and ensuring the medical cleanliness standards of pipette tips, such as being DNA-enzyme-free, RNA-enzyme-free, and pyrogen-free. ### III. Core Structural Design - **48-cavity balanced layout** Through professional mold flow analysis to optimize the runner path, the multi-cavity array is evenly arranged, achieving a gating balance degree of ≥ 99% for 48 cavities. The weight and size consistency of a single pipette tip are extremely high, eliminating defects such as short shots, shrinkage, and deformation. - **Special hot-nozzle design for side-gating** It adopts an open-type side-gate structure, injecting the material from the hidden position on the side wall of the pipette tip. The gate mark is extremely small and does not require subsequent manual trimming. It does not damage the smoothness of the inner wall of the tip, avoiding liquid wall-hanging and sample residues, and ensuring pipetting accuracy. - **Precision temperature control system** With independent zoning for precise temperature control, the temperature control accuracy is ±0.5℃. The material is controlled at a constant temperature throughout the process, adapting to the stable melting of PP materials, eliminating cold-material spots and flow marks, and being suitable for a high-speed molding cycle of 5.5-7 seconds. - **Medical-grade material configuration** The core components of the manifold and hot-nozzles are made of special anti-rust and corrosion-resistant mold steel. The runner is mirror-polished without dead corners, does not accumulate material, and is easy to clean and disinfect. It is suitable for the long-term continuous mass production of medical consumables and has a high mold life. ### IV. Core Product Advantages - **Medical-grade quality compliance** Side-gating does not damage the product appearance and sealing structure. The inner wall is smooth without burrs, meeting the strict usage requirements of precise pipetting and sample testing in laboratories and eliminating the risk of cross-contamination. - **Efficient mass production for cost-reduction and efficiency-increase** With 48 cavities in one mold, the full hot runner generates no cold-slug and no waste. The raw material utilization rate is nearly 100%. It eliminates the processes of gate-cutting and material recycling, is suitable for automated part-picking, and significantly saves labor and material costs. - **Stable molding with no easy deformation** The injection pressure is evenly distributed, resulting in low internal stress of the product. It effectively avoids problems such as bending, eccentricity, and uneven ports of pipette tips, and is suitable for large-quantity standardized shipments. - **Convenient maintenance and suitability for clean production** The modular disassembly and assembly structure allows for maintenance and cleaning of the runner residues without mold removal. It complies with the production specifications of medical clean workshops, has a short downtime for maintenance, and strong production continuity. ### V. Scope of Application It is suitable for various small-precision medical injection-molded parts such as laboratory medical pipette tips, filter-equipped pipette tips, and disposable sampling consumables. It is suitable for 100T-160T injection molding machines, supports batch standardized customization, and the hot-nozzle spacing, runner diameter, and gating points can be customized according to the specifications and dimensions of the pipette tips.