Vacuum pipe vacuum sizing sleeve setting zone basically vacuum chamber structure, the position near the entrance width is relatively small, usually 1 ~ 1.5mm, and a relatively dense arrangement of custom sizing sleeve, because this time the beginning of the cooling tube high temperature, relatively soft, if the width is too large will sucked into the pipe surface which affect the appearance. As the tube is gradually cooled to harden, width can be increased to 3 ~ 4mm, slot spacing can be increased. Vacuum tank cooling effect is better than the vacuum holes, because the water forms a film through these slots speed calibration sleeve, tube slide and help in sizing the cooling jacket enables cooling area increases. Therefore, the structure is good or bad vacuum forming region directly affect the cooling effect of the sizing sleeve, during the length of the outer surface of the pipe must be hardened sizing sets the price, leaving the tube when sizing sleeve, wall hardening depth must enough to support the weight of the tube, not deformed or broken, otherwise it will affect the dimensional accuracy of the tube. While also improve sizing sleeve length to increase the cooling effect, but there is the difficulty of processing, high production cost, convenient operation, caused by excessive friction, increase the traction power while the tube will produce stress, lower pipe surface finish. Therefore, the sizing sleeve length should be appropriate, generally about 10 to 12 times the inner diameter. Sizing sleeve suitably good thermal conductivity metal, pipe sizing sleeve at home and abroad are working with a wear-resistant copper alloys. Plastic pipes may be adjustable calibration sleeve, including copper sleeve, wherein: at one end of the copper sleeve in the axial direction at least three gaps, gaps in the circumferential average copper sets of copper sets; copper sleeve slotted There collar on one end, the other end of the copper sleeve stretching device has a connecting collar. Collar and copper have their own set of ramps fit. Copper sleeve gap of curves or lines or polylines. Stretching device by the connecting rod and turn the handle sleeve ring, which has screw terminal connection screw hole on the cover ring on the lever. The utility model has the advantage in the production process can be based on production requirements, time to change the inner diameter of the sizing sleeve, change the thickness and replacement demand for plastic raw materials for processing when the pipe. Our design and production of vacuum sizing sleeve according to different plastic molding characteristics can be divided into: direct cooling curtain, disc type, spiral tank type, the user can choose differently shaped structure according to production speed products diameter. Achieve higher production speeds and the best product appearance. The above picture shows that our production of copper sizing sleeve with different specifications, for your reference! ! ! ! PERT calibration sleeve, sizing sleeve, day Nobuyasu provided by Qingdao day letter Thai Plastic Machinery Co., Qingdao day letter Thai Plastic Machinery Co., Ltd. (www.qdtianxintai.com) (www.txt-extruder.com) strong, credible, in Qingdao, Shandong granulator industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Tition Taihe you hand into the brilliant, for a better future!