Melt pumps are primarily used in the raw material extrusion stage of plastic woven bag production lines (such as core processes like flat yarn extrusion and film coating extrusion). Their core value lies in stabilizing melt pressure/flow rate, enhancing product precision, and improving production efficiency.
Flat yarn extrusion represents the most critical application scenario for melt pumps. The PP/PE melt extruded by the extruder is conveyed by the melt pump to the flat yarn die head, ensuring uniform melt flow and stable pressure at the die inlet. This prevents variations in yarn thickness caused by fluctuations in the extruder screw, which directly impact the tensile strength and appearance of woven bags.
During surface coating applications (e.g., waterproof coatings) for woven bags, melt pumps supply stable melt to the coating die, ensuring uniform coating thickness and preventing defects like bare spots or thickness variations.
Recommended Supporting Equipment
Screen Changer: Mandatory (especially when using recycled material). Dual-plate hydraulic screen changers are recommended, with screen mesh sizes of 80-120 mesh to prevent contaminants from entering the melt pump and die.
Temperature Control System: Interlock temperature control between the melt pump, extruder, and die head, maintaining a temperature difference ≤5°C to prevent melt cooling and solidification.
Variable Frequency Drive (VFD): Equip the melt pump motor with a VFD for stepless flow regulation, linked to the extruder speed control.
Email: sale@meltpump.com
WhatsApp: +86 158 3833 1071
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TEL：+86 371 67991755
WhatsApp： +86 158 38331071
Adress: No.22 Dongqing Str., High & New Technology Development Zone, Zhengzhou, China.
