-- essence of life is accurate and in pushing a technology that pull film for expecting without pulsatile ground, to achieve first-rate result, must assure stock to be sent modular head definitely by metric essence, and not pulsatile. When pump sends stock pulsatile (the wave motion that basically is pressure) can bring negative effect to the quality of the product, for instance gas acupuncture point is mixed film. Current, the market is smaller and smaller to the requirement of velar ply, it is taller and taller to the requirement of velar quality, bring about gear pump to be added to install by common ground between screw and modular head. Here the main effect of gear pump is metric, is not pressure boost. Well-known, although gear pump is to be offerred continuously,expect, but the pressure itself that its output end has wave motion. There is certain space between the tine that the reason is gear, exporting end, be gone to by abruptly extruding fill when stock when these clearance spaces it is certain to can have " explosion " effect. Previously, the gear pump that ever tried the 3 gear rod that uses special design will solve this problem, but this method is actually break up stock shedding it is two, among them output lag at another, such doing and did not solve wave motion, just increased fluctuant frequency one times just. Want achieved precision requirement according to place, the output of gear pump must be eliminated pulsatile. To this, german twist is unusual limited company of technology of pump line of business (WITTE) used another kind of method; This is, reduce fluctuant amplitude. Graph 1 it is the outlet pressure when gear pump uses straight tine, inclined tine and person handwriting tooth pulsatile amplitude graph. Person handwriting tine comparatives double helical gear, amplitude is the then smallest, and still have a lot of other advantages; Be like, to stock cut small, temperature rise low, pulsatile the smallest, make stock can very " smooth-going " the ground is carried. As a result of the tooth form structure that person handwriting ages, stuff can be easy the ground is taken away from inside the clearance between tine and carry exit end. Be based on these discovery, WITTE and squeeze a line that pull film to produce business to having close cooperation. Development went the gear pump that using with them to have the herringbone gear pump of same link dimension, eliminated so transform a process complexly, also saved cost. Because new-style pump wants lesser installation space only, the crust of pump deployed to receive outfit board. The axis of WITTE pump and bearing used special design (graph 2) . The material that turns processing with nitrogen is 1. 2343 (H11) gear axis and material are 1.
3343 (M2) the bearing of tool steel is combination of a pair of wear-resisting. The place that differs with other vendors is, the gear of person handwriting tine of WITTE is whole of a material machine and become. The gear of person handwriting tine of whole to be not form of characters or letters can have clearance consist in inevitably have sex between inclined tine place, can leave the mark of backbone shape on film so, reduced product quality greatly. In gear pump, another crucial part is bearing. The surface of these tool steel bearing passes polishing, the polymer stock that the lubrication groove that WITTE patent designs suits to be stuck high particularly or freeboard sticks, can take away the attrition heat between axis and bearing at the same time. The advantage of the EXTRU716-8 pump that performance data shows to be sent on a diplomatic mission ages with person handwriting clearly (graph 3) . Two systems are used at producing ply to be in the film of 12~125 micron, the result is as follows quite: On the film that old system pulls often imperfect, and new system makes have change apparently, gas acupuncture point and flaw were eliminated greatly. In the meantime, the speed that pull film from 420 meters / minute promotion goes to 440 meters / minute, defect rate dropped 60% . The design of pump, basically be axis and bearing respect improve make systematic usability increases greatly. Meanwhile, because wear away of the component decrease, maintenance cost is a lot of more economic also. CNC Milling
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