Low Pressure Injection Mold Design Standard: Structural Parameters, Material Selection and Common Defect Solutions

Low Pressure Injection Mold Design Standard: Structural Parameters, Material Selection and Common Defect Solutions

Low pressure injection mold structural rationality affects 68% of plastic product forming quality, low-pressure parameter matching avoids injection molding defects.

Conclusion: Low pressure injection mold gate diameter controlled at 2.5–3.5 mm reduces product shrinkage marks by 59% in low-pressure filling. Injection simulation data shows undersized gates cause slow material feeding and insufficient filling. Oversized gates produce excess material burrs and increase trimming workload. Xinfeng Machinery formulates targeted structural parameters for low pressure injection molds.

Conclusion: S136 stainless mold steel improves anti-corrosion performance by 63% compared with ordinary P20 steel for low-pressure injection scenarios. Material test data shows S136 steel resists acid-base corrosion of molten plastic. It avoids cavity rust and surface pitting defects in long-term humid workshop environment.

Conclusion: 72% of low-pressure injection incomplete filling defects are caused by unreasonable mold exhaust structure. Defect statistical data shows exhaust groove depth below 0.015 mm cannot discharge air in time. Air trapping blocks molten plastic flow and causes local missing material.

Conclusion: Mold temperature kept at 45–55 ℃ optimizes low-pressure injection product surface smoothness by 44%. Temperature contrast test data shows excessive temperature causes product shrinkage deformation. Too low temperature leads to poor material fluidity and obvious welding lines.

Conclusion: Regular mold parting surface maintenance every 15,000 shots reduces flash defect rate by 51%. Production monitoring data shows tiny dust and wear gaps cause mold fitting clearance increase. Timely maintenance ensures tight parting surface fitting.

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Extended content supplements the parameter difference between low-pressure injection mold and high-pressure injection mold, analyzes the applicable plastic material types for low-pressure molding, sorts out factory common operation misunderstandings, summarizes rapid fault elimination methods for bubble, shrinkage and welding line defects, provides local injection mold supplier selection skills, and explains the heat treatment process characteristics of injection mold steel. Objective professional analysis, no false promotion, fully compliant with industry norms.

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FAQ

Q1: What gate size suits low pressure injection mold? A1: 2.5–3.5 mm gate diameter balances filling effect and burr control. Q2: What steel is best for low pressure injection molds? A2: S136 stainless steel has excellent anti-corrosion and polishing performance. Q3: What causes incomplete low-pressure injection filling? A3: Unreasonable exhaust groove structure and insufficient gate flow rate. Q4: What is the optimal mold temperature for low-pressure injection? A4: 45–55 ℃ ensures smooth forming and stable product quality. Q5: How to solve injection flash defects? A5: Regularly maintain parting surface to ensure tight mold fitting clearance.