JPS6332889B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for manufacturing crimped yarn.

Another object of the present invention is to combine two compound fiber yarns, which are long fibers, into one composite processed yarn, and to make a spunlike yarn.

Examples will be described below based on the drawings.

That is, FIG. 1 is a schematic explanatory diagram of a limp yarn manufacturing apparatus according to the present invention, in which three nip rollers 1, 2, and 3 are arranged, and between the second roller 2 and the third roller 3, A heater H1 and a false twisting spindle S are arranged. This false-twisting spindle S is a belt-type false-twisting spindle consisting of two belts that intersect and run in different directions, as will be described in detail later, and the belt crossing angle θ can be adjusted to increase or decrease. is being done. Note that a cooling device is provided between the heater H1 and the spindle S depending on the case. 5 is a take-up roller which winds up processed yarn as package M and P. A second heater H2 and a guide roller 4 are arranged between the roller 5 and the third roller 3 depending on the situation. The second heater H2 is a known one and functions as a twist set heater. Also,
An oiling device is optionally provided in this zone.

SP1 and SP2 are supply packages, and the material used is undrawn yarn or semi-drawn yarn such as nylon, polyester, or a mixture of the two, and one supply yarn and the other supply yarn may be made of the same material. It can be made of different materials.

In addition, if you use undrawn nylon yarn on one side and semi-drawn polyester yarn on the other side, the nylon will be dark dyed and the polyester will be light dyed. It would be advantageous to be able to do so.

In the above apparatus, the space between the first roller 1 and the second roller 2 is defined as a first stretching section D1, and the space between the second roller 2 and third roller 3 is defined as a second stretching section D2. Then, the first yarn Y1 from the first package SP1 is pulled out by the first roller 1,
The first stretching section D1 and the second stretching section D2 are passed successively, while the second package SP2
The second yarn Y2 is drawn out by the second roller 2, and is allowed to pass through only the second stretching section D2. Therefore, the first yarn Y1 and the second yarn Y2 join together between the first roller 1 and the second roller 2, and are then subjected to a false twisting process while being stretched together in the second stretching section D2. After the yarn is twisted and set by the second heater H2, it is wound up as winding packages M and P. Referring to FIG.
It will be understood that a drawing of D1×D2=D3 takes place, and the yarn Y2 on the second supply package side only takes place of a drawing of D2. (Here, D1 and D2 represent each stretching section and at the same time represent the stretching ratio in each stretching section.) In this way, the first yarn Y1 and the second yarn Y2 have different stretching ratios. As a result, at the time when it passes through the second roller 2, the first yarn Y1 under the stretching tension of D1 has molecular orientation and crystallinity.
It is drawn and false twisted in a more accelerated state than the second yarn Y2 which came in a free state. On the other hand, the second thread Y2 is
Since the fiber passes through the second roller in a free state without being stretched between the roller and the second roller, the tension at the time of joining becomes Y1>Y2, and the fiber is false-twisted in this state. Therefore, the second yarn Y2 is located in the core part of the crimp yarn with the uneven surface structure schematically shown in FIG. It is located with a coarser crimp than yarn Y2. Further, when this crimped yarn is observed in the longitudinal direction, it is found that the crimped portions A are arranged at a fixed pitch or at random pitches, and the tight portion B is present between the crimped portions. (3rd
figure). In addition, from the point of view of creating a difference in shrinkage rate in the above-mentioned apparatus, a pin heater that contacts the first yarn may be added between the first roller and the second roller.

By the way, regarding the set values of the stretching ratios D1 and D2 in each stretching section in the above example, for example, for an undrawn nylon yarn that is fully stretched at 3.1 times, D3 = 2.64, and D1 = 1.14 ~
1.15, therefore, it is desirable to set D2=D3/D1=2.3 in terms of yarn strength and partial fusion of the yarn. That is, D3
It is preferable to keep it at 80 to 95% of full stretching, preferably 85%.If set in this way, partial fusion tends to occur at low temperatures and the yarn strength is high, but as it approaches full stretching, The amount of heat required to cause partial fusion is large, and it is necessary to increase the thermal energy of the heater H1 or reduce the yarn speed.On the other hand, if it is reduced too much from 80%, the yarn strength will decrease. If D1 is further increased, D2 becomes smaller because D3 is constant, and the difference in the draw ratio between yarn Y1 and Y, Y2 becomes larger. In this case, the curve N shown in the fourth figure
1, thread Y2 is cut first, then thread Y1
The curve N2 in which both yarns were cut at the same time could not be obtained, and experimentally D1
The yarn strength curve of curve N2 can only be obtained by increasing the ratio by 1.05 to 1.25 times, preferably 1.14 to 1.15 times.

Next, from the above findings, the optimal conditions for nylon undrawn yarn are D1 = 1.14, D2 = 2.3, D3 = 2.64.
Let's compare the calculated results and the actually measured results regarding the denier when it is made.

In other words, the undrawn nylon thread used in the experiment was 70
Denier and fully stretched 3.1 times,
Calculated upper thread Y1 is 217/2.64 = 8.21, thread Y2 is 217/
2.3 = 94.3, so the total of the two pieces will be 176.4 denier, and if the heat shrinkage rate is 5%, it will be 176.4 x 1.05 =
It became 185.2. On the other hand, the crimped yarn obtained as a result of actual measurement had a denier of 182, proving that the above-mentioned relationship values function well.

Furthermore, to explain in detail the external shape of the yarn produced by the above-mentioned apparatus, the yarn obtained by the above-mentioned apparatus has an external structure consisting of a crimp part A and a tight part B as shown in FIG. The false twisting spindle used in the above device is of the type in which two belts intersect and run in opposite directions, and the intersecting angle of the belts can be increased or decreased to impart false twist to the yarn between both belts. As already mentioned, the spindle is selected, but by adopting the spindle as described above, the ratio of the diameters of the tight part and the crimp part (D/d), the dimensions of the tight part, and the diameter of the tight part can be improved. The number of pieces per meter can be varied.

That is, the above change is closely related to the crossing angle between the belts, and the actual data is shown in FIG. This crossing angle means the angle θ on the side where the yarn enters the belt-type false twisting spindle, as shown in FIG.
As the belt crossing angle θ becomes larger, the ratio of the diameter of the crimp part to the tight part (D/d) becomes larger, the dimension L of the tight part becomes larger, and the number of tight parts per meter increases (No. Figure 5).

Therefore, by appropriately adjusting the belt crossing angle θ based on the above data, a crimped yarn with a desired appearance can be manufactured.

This spindle is covered by U.S. Patent No.
4047373, two belts S
1, S2 intersect and run in the opposite direction, and the intersection 12
The yarn is nipped and false-twisted, and a twist is applied to the yarn V3 and a force for feeding the yarn from the spindle is applied V2. Of course, in the spindle shown in Fig. 6, two belts are used, but in reality, two rotating disks, which are equivalent to the belts, run in opposite directions and are provided around the circumference of the disks. The spindle may be such that the yarn is nipped and false-twisted at the portion where the edges intersect, the crossing angle can be changed, and the yarn is given a twist and a force is applied to feed the yarn from the spindle. .

As explained above, according to the method of the present invention, since a belt-type false twisting spindle is used, the yarn tension on the untwisting side can be lowered by the yarn feeding force of the spindle compared to other false twisting devices. This makes it possible to reliably form a tight portion, which is an untwisted portion, on the yarn. Further, by using the stretching ratio of the present invention, partial fusion can be easily caused in the yarn. This partial fusion has the effect of preventing untwisting by the spindle, so that the tight portion becomes noticeable and a high quality spun-like crimp yarn can be produced.

Furthermore, the endless belt intersection angle θ of the above spindle
Since the external structure of the crimped yarn can be changed only by changing the It is also possible to obtain special yarns whose outer structure changes in the longitudinal direction by modification.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram of an embodiment according to the present invention,
Figure 2 is a block diagram of the crimped yarn obtained by the present invention, Figure 3 is a schematic diagram of the external appearance of the crimped yarn, and Figure 4 shows what occurs when the stretching ratio is set appropriately and inappropriately. Figure 5 shows the change in the ratio of the diameter of the tight part to the crimp part (D/d), the dimensions of the tight part, and the number of pieces per meter of the tight part when the belt crossing angle θ is changed. The graph shown in FIG. 6 is an explanatory diagram showing one example of a false twisting spindle used in the present invention. 1...First nip roller, 2...Second nip roller, 3...Third nip roller, D1...
Stretching ratio between the first and second rollers, D2...second
and the stretching ratio between the third roller, D3...the total stretching ratio between the first and third rollers, H1...the heater, S
...False twisting spindle, Y1...First yarn, Y2...
...Second yarn, A...Crimp part, B...Tight part, S1, S2...Belt, θ...Belt crossing angle.

Claims (1)

[Claims] 1 First, second and third nip rollers are arranged in order, and a heater and a false twisting spindle consisting of two endless belts that intersect and run in different directions are arranged between the second and third rollers. Then, the first yarn is drawn between the first and second rollers, the second yarn is merged between the rollers, and while both yarns are stretched between the second and third rollers, they are temporarily drawn by the spindle. Twisted and the stretching ratio between the first and second rollers is 1.05.
to 1.25 times, and the total stretching ratio between the first and third rollers is 0.8 to 0.95 of the full stretching ratio of the first yarn.
By manufacturing a crimped yarn in which crimp portions and tight portions alternately appear by setting each double, and by changing the belt intersection angle of the endless belt,
A method for producing a crimp yarn, which comprises changing the external structure of the crimp yarn, such as the diameter ratio of the crimp part and the tight part, the dimensions of the tight part, and the number of tight parts per meter.