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2025
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Production process of extruded silicone vacuum hose
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Production Process of Extruded Silicone Vacuum Hose
Raw material preparation and pretreatment
1. Raw material selection
Select food grade/industrial grade silicone as the substrate, add white carbon black (to enhance hardness) and vulcanizing agent (to crosslink and cure). The raw materials need to be weighed accurately according to the ratio.
2. Mixing process
Put the raw materials into the internal mixer or open mill, and achieve uniform mixing through roller shearing and high temperature action. The mixing time is usually 10-15 minutes. After mixing, the rubber material needs to be filtered to remove impurities and ensure that the purity meets the standard.
Core process of extrusion molding
1. Equipment debugging
Preheat the extruder barrel to the segmented temperature (120-180 ℃), calibrate the gap between the mold core rod and the ring, and synchronously adjust the traction speed to match the extrusion rate.
2. Dynamic extrusion control
3. Vacuum defoaming: Install a negative pressure system in the extrusion section to eliminate micro pores in the adhesive material.
4. Mold design: Adopting high draft ratio molds to balance the tensile strength and wall thickness uniformity of the pipes.
Online monitoring: The laser caliper provides real-time feedback on the outer diameter deviation, and the linkage traction machine automatically corrects the deviation.
Sulfurization and post-treatment process
1. Vulcanization shaping
2. One stage vulcanization: The molecular chain cross-linking reaction is completed by continuously curing at 200-250 ℃ for 10-30 minutes in a high-temperature oven.
3. Secondary vulcanization: For industrial/food grade products, perform secondary vulcanization at 250 ℃ for 2-4 hours to remove low molecular weight volatiles.
Quality Inspection System
1. Physical performance testing
2. Burst pressure: ≥ 1.5 times the working pressure (ASTM D1598 standard)
3. Temperature resistance: No cracking during cyclic testing from -60 ℃ to 250 ℃
4. Dimensional accuracy: Wall thickness deviation ≤± 5% (ISO 1307 standard)
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Our factory specializes in the production and supply of high quality silicone hoses, food grade silicone hoses, medical silicone hoses, fuel hoses, radiator hoses, air rubber hoses, EPDM sealing strips, spiral protective covers and silicone plates and other trucks, automotive rubber accessories (support OEM and ODM).
Our address
Wangguanzhuang Town, Qinghe County, Xingtai City, Hebei Province,China