文章摘要
Study on Double-layer Composite Extrusion Process for Indwelling Needle Connecting Tube
Received:October 12, 2020  Revised:October 12, 2020
DOI：10.12136/j.issn.1000-890X.2022.05.0374
Key Words: indwelling needle connecting tube；double layer composite extrusion；process parameter；TPU；PVC；orthogonal test method
Author NameAffiliationE-mail
CHENG Lingling* Henan Tuoren Medical Equipment Research Institute Co.，Ltd 578470430@qq.com 
ZHAO Mingxue Henan Tuoren Medical Equipment Research Institute Co.，Ltd  
CHEN Pengtao Henan Tuoren Medical Equipment Research Institute Co.，Ltd  
MO Panpan Henan Tuoren Medical Equipment Research Institute Co.，Ltd  
NIU Fuchao Henan Tuoren Medical Equipment Research Institute Co.，Ltd  
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Abstract:
      The double-layer composite extrusion process of the indwelling needle connecting tube was studied by using thermoplastic polyurethane elastomer（TPU） and polyvinyl chloride（PVC） as raw material（pellets）.The results showed that，the optimum process parameters of the double-layer composite extrusion determined by orthogonal test were that the temperatures of TPU extrusion conveying section（zone 1），melting section（zone 2），metering section（zone 3），flange and die were 170，173，180，178 and 178 ℃ respectively，the speed of extrusion host was 15. 0 r·min-1，and the traction speed（traction cutting machine speed） was 18 r·min-1. The temperatures of PVC extrusion zone 1，zone 2，zone 3 and flange were 168，170，175 and 173 ℃ respectively，the speed of extrusion host was 15. 0 r·min-1 and the traction speed was 18 r·min-1. Under the optimum process parameters，the indwelling needle connecting tubes were continuously produced for 8 h，and the normal analysis results of the outer diameters of the sampled products showed that the double-layer composite extrusion process of the indwelling needle connecting tube was stable.
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