Plastic and nonmetallic article shaping or treating: processes – With printing or coating of workpiece – Anti-stick or adhesion preventing coating
Patent
1991-09-16
1993-11-30
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
With printing or coating of workpiece
Anti-stick or adhesion preventing coating
2641761, 2642108, 26421115, 26421118, 2642907, 2642104, D01D 516
Patent
active
052662543
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a process for high-speed spinning of a plurality of thermoplastic monofilaments each of from 1 to 30 dtex and a device for carrying out the process and also the monofilaments produced thereby.
The take-off of melt-spun multifilament yarns over brake pins for the purpose of influencing orientation and crystallization by friction is known (CH-A-475 375). In the known device, an undriven pair of rollers for stabilizing the converged multifilament yarns is provided between nonadjustable, fixed brake pins. However, such a device is not suitable for producing monofils.
Fine monofilaments of up to about 33 dtex are spun at speeds of less than 1000 m/min, cooled with an airblast, wound up and separately drawn in a second operation at about 750 m/min.
Although the properties of the monofils produced in a known manner, in particular their strength, are satisfactory, the slow spinning and separate/drawing is very uneconomical. There has long been a need to simplify and rationalize the production of monofils.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a process for producing fine monofilaments which without a separate drawing process but with high winding speeds achieves and/or exceeds the properties of known monofilaments.
It is a further object to vary the process in such a way that desired properties can be conferred on the monofilaments in a specific manner via the setting parameters of the device.
The aforementioned object is achieved according to the invention when, during airblast cooling, the melt-spun monofilaments are guided directly over a friction element, then spin finished and wound up.
Directly means that between a spinning jet and a friction element there is no contact with the running filament. This surprisingly is the first time that it has been possible to produce a monofilament at very high speed in a single stage.
The take-up speed lies within the range from 3000 to 6000 m/min, preferably from 4000 to 5000 m/min.
The process can be used for thermoplastics such as polyesters of any kind, polyamides, in particular those which are known as nylon 66 or nylon 6, and also polyacrylic, polyvinylidene fluoride, polyethylene or polypropylene.
The device for carrying out the process consists essentially of a friction element situated between the spinning jet and the spin finish application means. The friction element is preferably fork-like, rotatable and movable relative to the spinning jet.
In a fork-like construction of the friction element, the two opposite friction surfaces, an upper friction surface and a lower friction surface, are arranged parallel. These parallel surfaces can be provided on circular cylindrical rods or pins whose axes are parallel.
A friction element, once it has been set at a certain distance from the spinning jet and fixed in place, can be rotated about its axis continuously or in fixed stages in such a way that a filament extending between the friction surfaces can be provided with a desired tension. The stepwise adjustment has the advantage that the desired positions are always exactly relocatable, ensuring a constant, reproducible filament tension.
The friction element can consist of a plurality of pins which have a cylindrical or else oval surfaces. However, it is also possible to use other bodies having curved surfaces.
It is advantageous, to achieve the desired filament properties, to select a distance of the friction elements from the spinning jet within the range from 20 to 280 cm, depending on the desired monofilament linear density.
The twist angle .alpha. between the filament transport direction and the common axis of the friction element surfaces should be within the range from 0 to 40 degrees, and the wrap angle between friction element and monofil should be within the range from 50.degree. to 150.degree.. When the friction surfaces are provided on two spaced apart parallel pins the "common axis of the friction element surfaces" is a straight line drawn through the axes
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Baris Halim
Fischer Klaus
Rhone-Poulenc Viscosuisse SA
Striker Michael J.
Thurlow Jeffery
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