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AssigneeTeijin Limited
InventorsKikuo Hori, Takumi Horiuchi, Mikio Nishikawa, Shiro Ryugo, Akira Ishizuka, Yoshisuke Takenaka
Estimating the term…
In an operation for winding a synthetic thread on a cylindrical bobbin for producing a full size yarn package at a winding speed more than 2500 m/min, the possible creation of defective yarn winding is positively prevented by increasing the tightness of the winding thread on a just previously formed thread layer of the yarn package, at least once in a predetermined period defined by a critical condition. Such predetermined period is defined by 1.20.times.10.sup.-6 .ltoreq. (dw/dt)/D .ltoreq. 3.0.10.sup. -6 wherein w represents the number of bobbin rotations per one reciprocal traverse motion, t represents the time in minutes and D represents the thickness of the thread in denier. The above-mentioned winding tightness is created by intentionally increasing the winding yarn tenson and/or increasing the contact pressure of the yarn package with a friction driving roller.
In an operation for winding a synthetic thread on a cylindrical bobbin for producing a full size yarn package at a winding speed of more than 2500 m/min. an improvement comprising increasing the tightness of winding said thread on previously formed thread layers of said yarn package in at least one stepwise increment during a period of said winding operation when 1.20.times.10.sup.-6 .ltoreq.(dw/dt)/D.ltoreq.3.0.times.10.sup.-6, wherein w represents number of bobbin rotations per one reciprocal traverse motion, t represents time in minutes, and D represents the thickness of said thread in denier.
In a winding apparatus for winding a synthetic thread on a cylindrical bobbin for producing a full size yarn package, the apparatus including a traverse motion mechanism and a take-up device, an improvement comprising,
Dependencies are inferred from the claim text.