Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
RADIAL STRENGTHENING DEVICE AND METHOD FOR POLYLACTIC ACID TUBE
Document Type and Number:
WIPO Patent Application WO/2022/012087
Kind Code:
A1
Abstract:
A radial strengthening device for a polylactic acid tube, comprising a tubular mold, rotating blades, and distal blades. A rotating shaft of the rotating blades is provided in the axis position of the tubular mold; a first end of the distal blades is movably connected to the rotating blades, and a second end is controlled by a control rod to be opened and closed. A strengthening method using the radial strengthening device for the polylactic acid tube comprises: putting a polylactic acid tube to be strengthened into the strengthening device and heating for a first preset duration; rotating the rotating blades in a constant direction while opening the distal blades, enabling the second end of the distal blades to be close to the tubular mold, and after squeezing and scraping for a second preset duration, closing the distal blades to return to an initial state; and cooling the strengthening device to room temperature, taking out a strengthened polylactic acid tube, and cutting off excess sections. The tube strengthened by the strengthening device and method has better wall thickness uniformity, more precise inner and outer diameter dimensions, no axial orientation, and no thermal creep in the low temperature range (body temperature, etc.).

Inventors:
WANG LI (CN)
ZHANG CHENZHAO (CN)
CAI TAO (CN)
WANG JUNYI (CN)
Application Number:
PCT/CN2021/083756
Publication Date:
January 20, 2022
Filing Date:
March 30, 2021
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
SHANGHAI BIO HEART BIOLOGICAL TECH CO LTD (CN)
International Classes:
B29C71/02; B29C71/00
Domestic Patent References:
WO2002055290A12002-07-18
Foreign References:
CN1221675A1999-07-07
CN102126297A2011-07-20
CN111559098A2020-08-21
CN201711213237A2012-12-21
Attorney, Agent or Firm:
SUNRAY INTELLECTUAL PROPERTY ATTORNEYS (CN)
Download PDF: