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How can surface defects and equipment malfunctions in extruded rubber hose products be diagnosed?

Time：

2026-05-31

How can surface defects and equipment malfunctions in extruded rubber hose products be diagnosed?

In the production of 90‑mm rubber hose extruders, surface defects such as roughness, wrinkles, bubbles, and cracks—as well as equipment malfunctions like overload, abnormal noises, and temperature‑control failures—are major factors that constrain both production efficiency and product quality. Many manufacturers, due to imprecise troubleshooting and non‑standardized adjustments, face elevated defect rates and frequent equipment downtime, thereby hindering the stable, high‑efficiency operation of their production lines. Accurately identifying the root causes of these faults and mastering standardized diagnostic procedures are essential for ensuring reliable equipment performance.

Surface defects in finished products follow distinct causative patterns. When a hose exhibits a pitted, rough, and dull surface, the most common causes are an excessively low die temperature, insufficient plasticization of the compound, an extrusion speed that is too high, or a traction speed that lags behind. In addition, uneven mixing of the compound and the presence of reprocessed impurities can also give rise to this issue. If bubbles or voids appear on the product’s surface, they typically result from excessive moisture content in the raw materials, inadequate venting during extrusion, or elevated barrel temperatures that lead to decomposition and gas generation. Furthermore, cracking after molding often stems from overly rapid cooling, an improper vulcanization system formulation, or incomplete stress relief following extrusion. Moreover, excessively high extrusion speeds and sudden fluctuations in die pressure can cause irregular wrinkles on the hose surface, severely compromising both appearance and sealing performance.
Equipment malfunctions are primarily concentrated in three major systems: the drive system, the temperature control system, and the lubrication system. During production, motor overload and abnormal equipment noises typically arise from excessive feed rate, excessively high screw speed, or insufficient barrel temperature—conditions that sharply increase extrusion resistance—or from loose drive belts, worn bearings, or inadequate oil supply in the lubrication system. Lubrication system failures exacerbate friction between the screw and the barrel, leading to erratic fluctuations in die pressure and, in turn, triggering product quality issues. Meanwhile, temperature‑control malfunctions and excessive temperature variations are often caused by damaged heating elements or faulty temperature sensors, which fail to precisely regulate temperatures across different zones, thereby compromising the stability of the extrusion process.

Efficient troubleshooting and tailored solutions can swiftly resolve a wide range of issues. For surface defects, moderately increasing the die temperature, reducing the extrusion speed, and matching the standard traction speed can mitigate surface roughness and wrinkling; enhancing raw material drying and optimizing the equipment’s venting system can eliminate internal bubbles in the finished product; adjusting the cooling schedule and refining the compound formulation can prevent cracking. Regarding equipment malfunctions, regular inspections of heating elements and temperature‑control sensors are essential to ensure precise and stable temperature regulation; routine checks of the lubrication system—promptly replenishing lubricant and servicing oil‑supply lines—are also critical; appropriately managing feed rate and screw speed, along with periodic calibration of the drive system, belt tensioning, and bearing maintenance, will help prevent motor overload and abnormal equipment noises.