JPS6146562B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for producing a split yarn made from a synthetic resin tape, and particularly to a method for producing a split yarn characterized by increasing the speed of stretching and splitting of the tape.

Conventional polyolefin flat yarns and monofilaments have been produced by a so-called group process in which multiple tapes made by slitting a material film to a desired width are simultaneously introduced into a heating element such as a bath or oven, where they are stretched and split. . Split yarn also had its processing equipment incorporated into the process from drawing to winding, and was no different from the manufacturing method for flat yarn and monofilament.

However, with such group processing, troubles such as yarn breakage and tangles frequently occur during the drawing and splitting process, making it difficult to mass produce split yarns through high-speed processing, and there are also difficulties in terms of equipment for high-speed processing. The disadvantage is that this occurs.

An object of the present invention is to provide a method for manufacturing split yarn that can eliminate these drawbacks.

The structure of the present invention for achieving this object will be explained below based on an embodiment shown schematically.

In Fig. 1, 1 is an extruder for producing a raw film, 2 is a film delivery roll, and 3 is a roll for slitting the film into a tape of a desired width. It's a slitter. 4 indicates one weight, which is arranged in several rows corresponding to the number of tapes. 5 is a nip roll, 6 is a stretching heating section to be described later, and 7 is a first roll 7a, a second roll 7b, and a third roll.
It is a so-called Nelson type roll consisting of rolls 7c (of which 7b and 7c are free rolls), and the parallel angle between the central axes of 7b and 7c and the central axis of 7a, that is, the distance between 7a, 7b, and 7c is from one end to the other. 8 is a split roll having needle blades implanted on the outer circumferential surface of the roll, and is arranged between the rolls 7a and 7c, and 9 is a split roll that is arranged between the rolls 7a, 7b, and 7c as described later. 7
10 is an air sutcher for initial threading, full spooling changeover or trouble prevention; In the above device, the RT cam is driven by a torque motor.

In FIGS. 2 and 3, reference numeral 12 denotes a heating element in the stretching heating section 6 from which the heat insulating cover has been removed, and one surface and the opposite surface are heating curved surfaces that expand outward symmetrically in an arc shape. 13a, 13b, concave curved surfaces 14 ₁ , 14 ₂ and a free roll 15 at both ends.
Turn device 16 consisting of ₁ , 15 ₂ , 15 ₃ ...
is provided. As will be clear from what will be described later, the concave curved surfaces 14 ₁ and 14 ₂ may be fixed rolls.

Next, in the apparatus of the present invention having the above-mentioned configuration, the film produced by the extruder 1 is slit into tapes of a desired width by the respective slitters 3,
These several tapes pass through the delivery roll 2 and are delivered to each spindle 4.
guided by.

Each tape that has passed through the nip roll 5 in each weight 4 (hereinafter, only one weight of tape will be described) is transferred to the stretching heating section 6, that is, _as shown in FIG. Curved surface 14 ₂ , heating curved surface 13b, free roll 15 ₁ , heating curved surface 13
a, the free roll 15 ₂ , the heating curved surface 13 b, and the free rolls 15 ₃ . . . 15 ₆ are wound in this order. Thus, the front half of the heating body 12, that is, the concave curved surface 14 ₁
The portion of the tape wrapped around the heated curved surfaces 13a and _13b connecting the concave curved surfaces 14 ₁ and 14 2
The stretching point of the tape is delayed due to slipping at 4 ₂ , so that sufficient preheating is applied and the heating element 1
The second half of 2, that is, free rolls 15 ₂ , 15 ₄ ,
The portion of the tape wound around the heated curved surfaces 13a and 13b connecting the tapes ₁₅₆ becomes a neckline by stretching and slides on the heated curved surfaces _13a and 13b at high speed via the free rolls 151 _{to 156} .

The thus preheated tape is wound around the rolls 7a, 7b three to four times in a suspended state so as not to overlap, and then wrapped around the rolls 7a, 7b,
It is wound 3 to 4 times in the same state around the roll 7c, stretched 5 to 12 times as much as the nip roll 5, transported at high speed, and split by the split roll 8 located between the rolls 7a and 7c. It becomes yarn.

This split yarn is Air Sutsuka 10
After that, it is hoisted up by the hoisting device 11.

According to the apparatus of the present invention, since the heating element 12 is wound around the material tape during stretching as described above, the amount of heat required depending on the fineness can be adjusted by the number of windings. This makes it possible to process materials of any fineness at high speed with compact equipment.

Nelson-type rolls for stretching include a first roll 7a, a second roll 7b, and a third roll arranged in parallel.
The split roll 8 is a three-roll system consisting of a first roll 7a and a third roll 7c.
Since it is placed between the two parts, it is possible to perform splitting at the same time as stretching, and it is also possible to always provide stable tension to the split part and prevent uneven tension, which is the biggest cause of troubles caused by splitting. .

In addition, since the material tape is guided to each spindle 4 and stretched and split, a small split roll is required for the splitting, so any delicate processing is possible, making it an excellent split yarn comparable to multifilament. is obtained.

Furthermore, since the overall equipment is compact, it is possible to install and operate a large number of such equipment, which reduces the equipment cost per production volume.
It has advantages such as being able to obtain a split yarn at a lower cost than conventional flat yarns.

[Brief explanation of the drawing]

FIG. 1 is a schematic view of the entire apparatus for use in the manufacturing method of the present invention, FIG. 2 is a side view of the apparatus shown in FIG. 1 with the heat insulating cover removed in the stretching heating section, and FIG. 3 is a front view. 1... Extruder, 2... Delivery roll, 3... Slitter, 4... Weight, 5... Nippro roll, 6...
...Stretch heating section, 7...Nelson type roll, 7a,
7b, 7c...Each roll constituting the Nelson type roll, 8...Split roll, 9...Nippro roll, 10...Air sucker, 11...Hoisting machine, 12...Heating body, 13a, 13b... Heating curved surface, 14 ₁ , 14 ₂ ... Concave curved surface, 15 ₁ to 15 ₆
...Roll, 16...Turn device.

Claims (1)

[Claims] 1 A tape made by slitting a thermoplastic resin film to the desired fineness and number of tapes is guided unstretched to each weight, and one surface and the opposite surface are heated to form a heated curved surface that expands outward symmetrically in an arc shape, and both end surfaces are formed. Each tape is preheated and stretched by winding it several times around a heating body having a concave curved surface and a turning device consisting of a plurality of free rolls, and three rolls of the tape are arranged in parallel. The first of the Nelson-type rolls
The product is wound around the roll and the second roll several times in a suspended state, and then passed to the third roll and then wound several times in the same state, using a split roll disposed between the first roll and the third roll. A method for producing a split yarn, which comprises splitting the yarn at the same time as the stretching, and immediately winding up each split yarn processed in this way using a winding device.