JPS6163766A - Measurement of interlacing degree of bulky interlaced processed yarn - 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 (a) Field of Industrial Application The present invention relates to a method for measuring the degree of entanglement of a bulky multifilament processed yarn that has been subjected to an interlace treatment.

(b) Conventional technology In general, the number of branches of interlaced yarns can be measured by counting with the naked eye the number of interlaced yarns between the ins of arbitrarily sampled yarns, or by spreading the fibers to the length of the spread part between the intertwined parts. method of measuring the degree of confounding (CF value) (for example, Japanese Patent Publication No. 53-101
No. 91) is used.

However, these conventional methods for measuring the degree of confounding require complicated operations and take a long time, making it extremely troublesome to obtain the large amount of data necessary to understand the actual state of confounding, which generally has a large amount of variation. Ta.

(C) Problems to be Solved by the Invention The present invention, like the above-mentioned conventional method, is capable of determining the degree of entanglement by determining the entanglement form of each intertwined portion of the yarn to be measured or the length of each spread portion. The purpose of the present invention is to provide a method that can simply and easily measure the degree of entanglement of bulky entangled processed yarns, rather than a complicated and time-consuming method of measuring.

(d) Means and action for solving the problems The present invention includes:
The bulky entangled yarn that has been subjected to the interlacing treatment has lower bulkiness than the bulky yarn that has not been subjected to the entangling treatment,
As a result, the permeability of water decreases, and especially when used as a weft for weaving with a walk jet loom (hereinafter referred to as -8J, L), the flight speed and flight tension decrease, and the flight speed and flight tension decrease. This was done based on the findings from research conducted by the present inventors that the flight tension at the end of the process shows an extremely high correlation with the degree of entanglement of the bulky entangled yarn, at least within a range that can be used in practical use.

That is, the present invention provides a method for measuring the degree of entanglement of a bulky multifilament yarn that has been subjected to an entanglement treatment, in which one end of the yarn of a predetermined length is fixed, and the other end is exposed to a jet of water sprayed from a water spray nozzle. The flight tension at the end of the flight was measured, and the relational expression between the degree of entanglement (CF) determined in advance and the flight tension E at the end of the flight, E=A+B・(CF) (However, A This is a method for measuring the degree of entanglement of bulky entangled processed yarn, which is characterized by determining the degree of entanglement from B: constant, B: regression coefficient.

FIG. 1 is a simplified perspective view showing an example of a measuring device used in the present invention. In the measurement using the apparatus shown in Fig. 1, first prepare a predetermined length of the yarn to be tested (1), and hold one end of it with the gripping device (2).
Grip and fix the other end with the water injection nostle (: ()
．． ri through °C, the jet injected from the water fountain injection nozzle); 4)
The following tension is measured. 1 from tension sensor (4)! 'I et al. 1). The diagram shown in FIG. 2 is a diagram showing the electrical signal (tension signal) recorded by a high-speed (lool: m/5ec) electromagnetic oscillograph. In Figure 2, the vertical axis represents the flying tension of the yarn, and the horizontal axis represents time.
The initial peak of the curve (al indicates the tension when the yarn starts flying due to water injection), and the late peak (bl indicates the tension when the yarn has finished flying and the brake is applied to the yarn by the gripping device (2)). It shows the tension when given, that is, the flight tension E at the end of the flight.In the present invention, next, the value E of the flight tension at the end of the flight is shown.
It was determined experimentally in advance. L-related 2E =
The degree of confounding (CF) is calculated from A-1-B·(CF).

Figure 3 shows the property C that is almost the same as that of W, J, and L.
FIG. 3 is a simplified perspective view showing another example of the measuring device used in the present invention, which has 1 h. In the measuring device shown in FIG. 3, the bulky entangled yarn (5) to be measured is actively unwound from the pan cage (6) by a press roller (7). The measuring device (8) adopts a ring hook type that applies the concept of preliminary unwinding, and when the yarn (5) is gripped by the gripping device (2), the gripping device (2) and the press roller (7) The thread tension between the threads disappears, and the thread (5) is wound around the drum αω by the force of the ring hook (9). When the thread flight starts, the thread ( 5) is released, the tension applied to the yarn (5) by the jet water jetted from the water jet nozzle (3) overcomes the force of the ring hook (9), and the yarn (5) The thread (5) is unwound from the drum 0 [iI, and the thread (5) flies. When the thread (5) continues to fly and all the threads on the drum 00) are unwound,
The yarn (5) is fixed to the drum αω and a brake is applied, and this is the time when the yarn (5) has finished flying. In this case as well, the flying tension of the yarn is measured using the same method as in the case of the apparatus shown in Fig. 1 above, but in order to continuously carry out a predetermined length of yarn flying on the yarn to be tested, At the end of the yarn flight, the yarn (5) is gripped again by the gripping device 'Fe (21), and then the yarn is cut by the cutting device (1), and the flight is repeated again. Therefore, as shown in Fig. 4, the change in the flight tension of the yarn shows a slightly different peak from that shown in Fig. 2, and in the present invention, the tension that appears at times other than the end of flight is not so important. Although a detailed explanation will be omitted, among each peak, (al is the flight tension at the start of the flight, (bl is the flight tension at the end of the flight, and (C1 is the tension due to gripping at the end of the flight) , fdl is the tension at the time of cutting, and this tension change pattern is repeated.

Figure 5 shows (1) measurements taken using the apparatus shown in Figure 3.
FIG. 2 is a diagram showing tension changes during flight of the bulky entangled yarn and (II) the bulky yarn that is not entangled. Figure 5 N
) and FIG. 5(II), it can be seen that the level of the flight tension E at the end of flight is significantly different depending on whether or not the entangling treatment is performed.

In the present invention, the flight tension of the yarn at the end of flight can be measured using the devices shown in FIGS. 1 and 3, as well as the conventional W, J, 1. , can also be used as is.

Next, a relational expression for determining the degree of entanglement (CF) from the flight tension E at the end of flight of one yarn by the above method can be determined by the procedure shown in the following specific example. That is, polyester multifilament yarn 1500/48F was temporarily
Then, by changing the fluid entanglement treatment conditions to produce entangled yarns with different degrees of entanglement, using the apparatus shown in Figure 3,
While keeping the water volume and water pressure of the jet water jetted from the water jet nozzle (3) constant (2.5n?/1Iin, 15kg/cJ), each thread was allowed to fly, and the change in tension at that time was measured. The flight tension Ei of each yarn at the end of flight was determined, and the results shown in FIG. 6 were obtained by making it correspond to the entanglement degree (CP) i of each yarn. As is clear from Figure 6, the flight tension E at the end of the flight
shows an almost linear relationship with the degree of confounding (CF), at least in the practical range of confounding degree (CF) of about 200 or less, and as the degree of confounding (CF) increases, the value at the end of flight increases. This shows that the flight tension E of the plane decreases.

From the measured values of these degree of entanglement and flying tension E, the regression linear formula E = A 10B・(CF) (However, A: constant,
B: regression coefficient), A = 400. B--0
,70 was obtained. Here, the values of A and B are the amount of jet water and the water pressure.

Although it depends on the thickness of the yarn, for example, the amount of water and water pressure may be kept constant and determined for each fineness.

Note that A and B in the regression linear equation are determined by a conventional method.

(n: number of measurements) 8-[ΣEi-B・Σ(CF) i) / nl'r
=Cn・ΣEi ・(CF) i −ΣEi ・Σ(
CF) i/(n= (CF)” i −(Σ (C
F) if) Furthermore, the degree of entanglement (CF) of each yarn was measured by a method similar to that described in Japanese Patent Publication No. 5340191 (hook-drop method). That is, the interlaced yarn has opening portions and entangled portions alternately in the longitudinal direction of the yarn.
0.1. After applying an initial load of g/D, a hook is inserted into the opening part, the moving distance of the hook or the moving distance of the yarn is measured, and the value divided by 100 is defined as the degree of entanglement (CF). It is well known that the degree of confounding (CF) is approximately proportional to the number of confounds per meter (pieces/m).

The present invention uses the apparatus shown in FIG. 1 or FIG. 3, or ordinary glues J and L, for bulky entangled yarns of different finenesses, with constant flying conditions by water jet, and as described above. , a relational expression between the degree of entanglement (CF) and the flight tension E at the end of flight is determined in advance, and the degree of entanglement is determined from the above relational expression from the measured value of the flight tension of the yarn to be tested. , it is possible to know the degree of confounding in a very short time with a very simple operation. As shown in Figure 3, in the case of a continuous yarn flying type device, if the length measured in one yarn flight is 1 m, if the device is operated at a speed of 500 m/win, for example, it will take 1 minute. It is possible to know the degree of entanglement for 500 m, and if the variation in flight tension at the end of each thread flight is determined, it is possible to estimate the variation in the degree of entanglement for 500 m. Furthermore, although the device shown in Fig. 3 is formed of a yarn flying device, the flying tension behavior of the yarn is as follows.
It is almost the same as W, J, and L, and the load is smaller than that of normal formats, J, L, etc., and measurement can be performed at a measurement rate of about 100 to 2000 times/min.

(e) Example Bulky textured polyester yarn 1500/30F was subjected to fluid entanglement treatment to obtain a bulky entangled textured yarn. The apparent number of entanglements in the yarn was 155/m on average. Using a device not shown in Fig. 3, the yarn was run five times, and the flying tension E at the end of the run was
was measured, and the average value was 320 g. The fineness of the bulky interwoven polyester yarn determined in advance is 15.
0D, relational expression E = 4 when the number of filaments is 30
The degree of confounding (CF) calculated from 00-0.73 (CF) was 1) 0.

For comparison, the degree of confounding (CF) was measured by the conventional hook-drop method, and it was 97 with the number of measurements n-50.
．． n=100 and 120. n = 500 and 10
It was 8.

According to the present invention, the degree of confounding ('CF) can be determined with higher precision and in a much shorter time than with conventional methods.

(f) Effects of the Invention As described above, the present invention allows the entangled bulky multifilament processed yarn to fly with a jet of water, and measures the flying tension at the end of the flying to prevent the entangling, which is determined in advance. The degree of entanglement can be determined from the relationship between the tension and the flight tension at the end of flight. However, regarding the bulky entangled yarn of a predetermined length,
It is possible to determine the average degree of entanglement extremely accurately without being concerned about irregular entanglement forms or widely varying opening lengths, and it is also possible to easily generate signals that are optimal for online processing using computers. Moreover, the calculations are simple, and it is possible to collect and analyze a large amount of data with high accuracy and in a short time.

[Brief explanation of the drawing]

Fig. 1 is a simplified perspective view showing an example of the measuring device used in the present invention, Fig. 2 is a diagram showing changes in the flying tension of the yarn obtained with the measuring device shown in Fig. 1, and Fig. 3 is a diagram showing the variation in the flying tension of the yarn obtained by the measuring device shown in Fig. 1. A simplified perspective view showing another example of the measuring device used in Figure 4 is a diagram showing changes in the flight tension of the yarn obtained with the measuring device in Figure 3. Figure 5 (1') is a diagram showing the change in the flying tension of the yarn obtained with the measuring device in Figure 3. Figure 5 (■) is a diagram showing changes in flying tension of processed yarn, Figure 5 (■) is a diagram showing changes in flying tension of bulky processed yarn, and Figure 6 is a diagram showing flying tension and degree of entanglement at the end of flying. FIG. ! 1). (51... Yarn, (2)... Gripping device. (3)... Water jet nozzle, (4)... Tension sensor. (8)... Length measuring device

Claims (1)

[Claims] (1) In a method for measuring the degree of entanglement of bulky multifilament processed yarn, one end of the yarn of a predetermined length is fixed, and the other end is flown by a jet of water sprayed from a water spray nozzle. The flight tension at the end of the flight was measured, and the relational expression between the degree of entanglement (CF) determined in advance and the flight tension E at the end of the flight E=A+B・(CF) (where L, A: constants) ,
B: A method for measuring the degree of entanglement of bulky entangled yarn, which is characterized by determining the degree of entanglement from the regression coefficient (regression coefficient).