RADIAL STRENGTHENING DEVICE AND METHOD FOR POLYLACTIC ACID TUBE

    公开(公告)号:EP4094930A1

    公开(公告)日:2022-11-30

    申请号:EP21842835.7

    申请日:2021-03-30

    Abstract: Provided is a device for radially strengthening a polylactic acid tube, the device comprising a tubular mold, a rotating blade and a distal blade, wherein a rotating shaft of the rotating blade is arranged at an axial position of the tubular mold, a first end of the distal blade is movably connected to the rotating blade, and a second end of the distal blade is controlled by a control rod so as to open and close the distal blade. Provided is a strengthening method in which the device for radially strengthening a polylactic acid tube is used, the method comprising loading a polylactic acid tube to be strengthened into the strengthening device, and heating the strengthening device for a first preset time; rotating the rotating blade in a constant direction while opening the distal blade at a first speed, such that the second end of the distal blade approaches the tubular mold; after squeezing and scraping for a second preset time, closing the distal blade and restoring the distal blade to an initial state; and cooling the strengthening device to room temperature, taking out a strengthened polylactic acid tube, and cutting off redundant sections. The tube strengthened by means of the above-mentioned strengthening device and method has a better wall thickness uniformity, more precise inner and outer diameter dimensions, no axial orientation, and no thermal creep in a low temperature range (body temperature, etc.).

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