JPS5891834A - False twisting apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a false-twisting device for producing false-twisted yarns at high speed, stably, and of good quality.

More specifically, it is a friction false twisting device in which disks are superimposed and crossed over six rotating shafts that rotate in the same direction and are arranged approximately in parallel, and are arranged sequentially and cyclically around the rotating shafts. In the device, the running yarn to be heated is
The present invention relates to a friction false twisting device in which the outer circumferential speed of the disc is effectively applied to the heating and running direction, thereby imparting stable false twisting without damaging running yarns.

Speeding up the false twisting process has become particularly important by making the drawing process of synthetic fibers continuous or simultaneous with the false twisting process, but there are mechanical limitations in the spindle method.
On the other hand, there are many problems in terms of stability in the Li-Shu method. Although there are various types of friction false-twisting devices, it is difficult to put them into practical use because they have many common problems, such as increasing running resistance and damage to the fibers as the speed increases, and changes in the heating rate due to changes in the surface condition of the friction body. there were. In particular, when the drawing process and the false twisting process are carried out simultaneously, the drawn yarn is heated in an undrawn state which is extremely unstable against tension. The twisting stability of a false-twisting device is required to be higher than that required for false-twisting, and conventional frictional false-twisting devices could not be adopted unless significant improvements were made.

Such conventional examples include Japanese Patent Publication No. 4B-29807;
There is Japanese Patent Application Laid-Open No. 48-42121.

However, as mentioned above, the disadvantage of such a method is that the tension ratio increases and fiber damage increases. Another conventional example is West German Patent Publication No. 2310803
No. specification is known. However, this method attempts to match the twist angle and the yarn advancement angle;
This technique is not fully satisfactory for high-speed false twisting. In other words, when twisting is performed by rotating the disk completely, slipping will inevitably occur as the speed increases, and the twisting angle and the yarn advancement angle will deviate.

The present invention completely eliminates the deficiencies of the prior art as described above.

Moreover, it is an object of the present invention to provide a false-twisting device that produces false-twisted yarn that is stable in quality and has high productivity.

That is, the present invention.

[In an apparatus for false-twisting thermoplastic synthetic fiber filament yarn, at least four disks are sequentially attached to five rotating shafts that rotate in the same direction and are arranged in substantially parallel. False twisting characterized in that the disks are arranged in a circular manner, at least one surface of the disks is made of polyurethane resin, and the combined structure of the disks satisfies the following formula: Processing equipment.

[However, D is the diameter of the disk (mm), I+ij is the distance between rotational axes (-), and H is the center distance between adjacent disks (-). 〕”
It is.

The present invention will be explained in more detail.

When false twisting is applied to a running yarn, it is theoretically possible to apply an external force that matches the twist angle to the yarn axis in order to insert the specified twist without imparting running resistance to the yarn. I can explain. Therefore, in friction false twisting, in order to effectively twist the traveling yarn, it is necessary to apply a rotational force perpendicular to the yarn axis and at the same time to apply a running force in the yarn axis direction, as well as the friction speed at full speed. It is desirable that the resultant vector of both of them be made to coincide with the twist angle by acting on the yarn.

However, when the yarn speed is increased and the yarn is false-twisted at high speed, slip actually occurs between the surface of the false-twisting disk and the yarn surface, and it is clear that the above-mentioned resultant vector and twist angle do not match. became. In other words, during high-speed false twisting, the rotational force acting perpendicularly to the yarn axis always decreases due to slip.

As a result of intensive studies on frictional false twisting based on this idea, we have constructed a complete set of disks that have sufficient frictional force to insert a predetermined number of twists into the running yarn, and that It was found that a device that can take a suitable angle is effective. In other words, the disks are attached to six almost parallel rotating shafts that rotate in the same direction, and the disks attached to each rotating shaft overlap and cross each other, and are arranged in sequence so that they circulate around each rotating shaft. The false twisting device can apply sufficient frictional force to insert a predetermined false twist into the running yarn. In the false twisting device, the running yarn is set at an appropriate angle with respect to the group of disks,
That is, it is necessary to set the angle θ between the composite vector V of the disk twist insertion vector and the yarn travel vector in FIG. 4 and the twist insertion vector VT to be larger than the theoretical 5-value. By doing so, it is possible to reduce the rotational speed of twisting, eliminate running resistance, or positively provide a feeding action. The angle θ of the running yarn with respect to the group of disks is the diameter of the disk (D) and the distance between the centers of adjacent disks (H).

It is determined by the rotating shaft pressure Nd (L).

In the present invention, it is necessary to set the relationship between H and L as follows.

H By doing this, it is possible to obtain a processed yarn of extremely high speed, stability, and good quality.

In the above ml relational expression, when the value is 036 or less, there is almost no feeding effect on the running yarn, so running resistance becomes large, and the tension at the exit side of the false twisting device becomes too high.

Problems such as fluffing and thread breakage occur. Also.

If it is 2.7 or more, the thread feeding action is sufficient.

The friction speed for twisting becomes smaller and the predetermined false twisting is achieved □
cannot be obtained, or it becomes necessary to unnecessarily increase the rotational speed of the rotating shaft. This range needs to be selected appropriately depending on the number of disks, the friction coefficient of the disks, the type of running thread, the oil agent, etc., but it is preferably H. is an important element in relation to the degree of overlapping and crossing of the mounting disc group, and is preferably an equilateral triangle, but there is no problem as long as it is within the range of the above relational expression.

Next, in the present invention, in addition to satisfying the above relational expression,
It is necessary that at least four disks are sequentially and circularly arranged around the six rotating shafts that rotate in the same direction and are arranged substantially in parallel. This is because all discs must rotate in the same direction to be able to make temporary cash.

This is also because there is no feeding effect. In addition, arranging at least four disks sequentially and cyclically on all three rotating shafts allows the running yarn to be fed with full efficiency.
and necessary for stable twist insertion. Preferably, two discs are mounted on each rotating shaft, ie, six discs in total. What is the purpose of the present invention apart from the above relationship? cannot be achieved.

Next, in the present invention, it is necessary that the surface of at least one of the disks is made of polyurethane resin. Since the soft polyurethane resins used in conventional friction false twisting devices have poor wear resistance, it is preferable to use polyurethane resins with high hardness. The hardness is preferably 80 or more on the Shore hardness A scale of J.S. 6301. By using polyurethane resin on the disk surface, stable twist can be inserted. Further, for the surface of the other disks to which the polyurethane resin is not attached, a material with an appropriate coefficient of friction and good wear resistance can be used. For example, aluminum, aluminum alloy, nickel alloy, duralumin or its alloy, titanium or its alloy, metals such as stainless steel, and other plastics can all be selected arbitrarily.

The thread that can be used in the present invention may be any filament thread of thermoplastic fiber. The yarn may be drawn or undrawn, and may be monofilament or multifilament. In particular, the present invention is effective in speeding up the simultaneous false twisting of undrawn yarns.

Further, the present invention will be explained with reference to the drawings. FIG. 1 is a schematic diagram showing one embodiment of the invention. In FIG. 1, a drawn yarn or an undrawn yarn 1 of thermoplastic fibers is supplied to a feed roller 5 through a guide and a tension adjustment device 2, passed through a heat treatment device 4, and false twisted and twisted by a false twisting device 5. The yarn is heat-set by a heat treatment device 4. The yarn that has passed through the false twisting device is untwisted, passes through a delivery roller 6, and is wound into a package 8 via a winding device 7.

FIG. 2 is a side view of the false twisting device shown in FIG. The state in which the disc 9 is attached is shown as shown in FIG.

Although it is preferable that the center distances (H) of adjacent disks be equal, they may be within a range that satisfies the above-mentioned inequality.

Fig. 5 is a plan view of Fig. 2, showing the entire state of overlapping and crossing of one disc, with the running yarn located at the intersection point of adjacent discs, and moving sequentially from position A → B → H → A. Run. Therefore, the angle of the running yarn on the disk is as shown in Figure 4, and the velocity vector (VT) in the direction perpendicular to the running yarn for twisting.
The running direction velocity vector (VY) is as follows.

VT=VQQ8θ, VY=V sinθ Below, the equation of the fifth invention for gold is derived.

Let the displacement in the disk surface direction be 'ka'.

From ΔKNL, /T 1- = a = y From the centroid of the triangle 10- ΔO, LO, to D! x'-v'3L-x-(--L") - 〇 holds] From Δ0.MO, Jτ -・L=x+y+z Substituting ■, ■, ■ gives the displacement in the disk axial direction -qH As an indicator of the contact angle between the running yarn and the disk.

H2H becomes.

Therefore, the following formula holds true.

Furthermore, as described above, theoretically, it should be ideal if the value of θ and the twist angle of the yarn to be processed completely match.

However, according to the study by the present inventors.

For high speed machining of over 400m/min.

It does not coincide with the running yarn angle θ, and there is no need to make it coincide with it; in order to achieve stable processing, it is better to satisfy the above-mentioned inequality.

According to the study by the present inventors, surprisingly, 16- As a result, stable high-speed friction false twisting processing is achieved.

This relationship is particularly effective in high-speed machining of 1% to 400 m/min or more. Of course.

Although low-speed machining of less than 400 m/min is possible within the range that satisfies the various relationships, in that case there is no significant difference in effectiveness from cases other than the various relationships.

Note that FIG. 6 is shown for comparison with the above-mentioned West German Patent Publication No. 2310803, which is a known invention, and this will be explained in the Examples.

Since the present invention has the above configuration, it has all the effects of the 9th order.

In other words, it is possible to give the running yarn a twisting action that is close to the ideal in reality, eliminating the problems of fiber damage, fluff, and yarn breakage, making it possible to perform extremely high-speed and stable false-twisting processing. It is. Furthermore, changes in the surface condition of the disk are improved for the reasons mentioned above, and heating fluctuations are extremely small.

The processed yarn produced according to the present invention is hardly subjected to abnormal tension, and therefore has good crimpability and fastness.

Example 1 Processing was carried out in the manner shown in FIGS. 1 and 2 under the following common conditions and the conditions shown in Table 1.

[Common conditions]

Supply yarn: polyethylene terephthalate fiber 150D-
75f Heat treatment temperature: 220'0 Polyurethane disk hardness = 92 4 pieces (attached to the 2nd to 5th disks from the top out of a total of 6 disks) The results obtained are also shown in Table 1.

As shown in Table 1, in the device of the present invention, the tension at the exit side of the false twisting device is low, and as a result, occurrence of fuzz and decrease in strength can be prevented, and furthermore, the processed yarn has good crimp characteristics. In terms of operation, the above-mentioned advantages were confirmed as the tension was stable, the threading operation was easy, and there was very little change in the surface condition of the disc. It was also found that the yarn advancing angle α was higher than the actual twist angle B at all levels.

Experiment No. 1 is a comparative example and has a lot of fuzz because the tension on the exit side of the device is too high, and Experiment No. 10 not only decreases but also has poor stability of the running yarn on the 9 disks.
Stable operation is difficult due to the occurrence of undissolved lint or thread breakage.

Example 2 Undrawn polyester synthetic fiber yarn with birefringence Δl) of 45x10 (150D-30f after processing) Yarn speed 6
Processing was carried out under the conditions of 00 m/min + heat treatment temperature of 225°C and the conditions shown in Table 2.

The results obtained are also shown in Table 2.

Table 2 When the number of disks was three, the contact state of the running yarns on each disk became unstable, resulting in the problem of unresolved threads or yarn breakage.

Comparative Example 1 In Example 2, under one condition (■), four disks were arranged sequentially on three axes consisting of A, B, and C (,
For those arranged in the order of A-e f3-+C-*f3, the heating action is sufficient, but the feeding action is not exerted, so the tension ratio Fi becomes more than double.

Stable processing without fuzz could not be obtained as in the present invention.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an embodiment of the invention. FIG. 2 is a side view of the false twisting device of the present invention. FIG. 6 is a plan view of FIG. 2. FIG. 4 shows the entire condition of the yarn running on the disk. FIG. 5 is an explanatory diagram for deriving the constitutive formula of the disc of the present invention, and FIG. 6 is an explanatory diagram for comparing with known examples. 1: Yarn 2: Root adjustment device 5: Feed roller 4: Heat treatment device 5: False twisting device 6;
Delivery roller 7 2 Winding device 8: Package 9: Disc A, B, C: Rotating shaft 19-

Claims (1)

[Claims] (1) In an apparatus for false twisting thermoplastic synthetic fiber filament yarn, at least four disks are attached to five rotating shafts that rotate in the same direction and are arranged in substantially parallel. are arranged sequentially and circularly,
Furthermore, the false twisting device is characterized in that the surface of at least one of the disks is made of polyurethane resin, and at the same time, the combined structure of the disks satisfies the following formula. H [where, D is the diameter of the disc (mm), L is the distance between rotational axes (mm), and H is the center distance between adjacent discs (=)]