The Study On The New Tape Pin Licker-in

By experiments on a single licker-in carding machine with pin licker-in and saw-toothlicker-in, the characteristics of pin licker-in were discussed so as to lay a theoreticalfoundation for pin technology to use on a carding machine. The experiments about pinlicker-in were done in the First Cotton Spinning Factory of Nanjing, Huayang Textile Co.Ltd. of Jiangsu and Carding Laboratory of Liaodong University. Card sliver and yamirregularity were tested by USTER AFIS and USTER respectively. In the meantime, takingthe research results of Stewart Company of Scotland and some Indian technicians asreferences, analysis and researches about the characteristics of pin licker-in were made bythe help of charts and tables from the structure of new style pin licker-in, cardingcharacteristics (including fiber damage, impurity, nep, immature fiber removing),percentage and discrepancy of droppings, spinning effect and resistance to grind of newstyle pin licker-in, etc. Some conclusions were drawn as follows:(1) By using wedge structure to install needles in the new pin licker-in, some defectsof the traditional boring structure were overcome, The needles can be repaired andreplaced easily and the pin density can be adjusted. Furthermore, the lifetime of new pinlicker-in is over 10 times longer than saw -tooth licker-in.,while its price is only as half asthe traditional one.(2)New tape pin licker-in is better than saw-tooth licker-in in reducing fiber damage.(3) New tape pin licker-in is almost the same as saw -tooth licker-in in removing nepand impurity.(4) In carding process, though the droppings percentage of using pin licker-in is higherthan saw-tooth licker-in under the same conditions, the short fiber percentage is alsohigher.(5) New tape pin licker-in is almost the same as saw -tooth licker-in in removingimmature fiber.(6) New tape pin licker-in is better than saw-tooth licker-in in spinning quality.(7)The research on pin licker-in with different specifications proves that that the pinlicker-in with working angle of 66°is the best.