JPS62250240A - False twisted yarn having different tension applied thereto - 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 generally to improved pseudo-twisted yarns, particularly polyamide and polypropylene yarns used in the manufacture of loop tile carpets with minimally observable directionality, and methods of making the same. Loop pile rugs are most commonly produced by tufting machines in which a number of needles, each with a pile yarn attached, force the yarn through the backing #la fabric and hold it in place, creating a loop as the needles are withdrawn. The method is then repeated to create a straight line of loops along the length of the advancing backing fabric. When using untwisted regular pile yarns or balanced multi-twist yarns, the geometry of the loops in these two directions when viewed along the longitudinal and transverse directions of the fabric is Because of the difference, Mm has a different appearance. This phenomenon is known as directionality. Furthermore, the tufts appear to be arranged in different rows when viewed from either direction. Directionality typically requires that all rugs in a given location run in the same direction when pieced together. Otherwise, the junction of two parts in different directions will appear as a non-uniform point. Move the needle back and forth in the lateral direction when advancing the lining (step-over
Although tufting can reduce the number of different rows to a certain extent, it requires a more expensive tactifier and does not solve the problem. Many common types of M-forges involve multiple twists of two or more individual carpet threads, creating a larger thread or giving the integrity or appearance of a twisted product than that obtained using a single thread. There is a need. Two or more differently colored or dyed yarns are often joined together to obtain a multicolored effect. The multiple twisting process limits the speed at which the heavy yarn feed packages rotate relative to each other due to centrifugal forces, resulting in relatively slow linear speeds of about 40 to 70 yards per minute (37 to 64 rin). Process costs are high because it has to be used. When multiple twists are performed by applying different tensions to two or more threads,
The threads with the highest tension move to the center of the whole system, the threads with lower tension appear on the surface, and the threads with higher tension move to the center of the whole system.
If the threads are of a different color or luster, they will create a "barber's rotating column" appearance. The formation of such cores is generally considered undesirable. US Pat. No. 3,427,647 describes a somewhat similar method of wrapping yarn around a pseudotwisted core yarn. In this method, the wound yarn moves back and forth with respect to the core yarn, resulting in overlapping wound areas. Such areas are undesirable for carpet yarns because the threads used for wrapping are usually of a large denier, and the wrapping becomes too large in diameter above the area, making it difficult to handle the tubes and needles of the tufting machine. This is because problems will arise in the supply of In the present invention, the winding is characterized in that the filaments of the yarn are 1 to 14% longer than the filaments of the core yarn and form an irregularly inverted coil around the core yarn. A polyamide or polypropylene continuous multifilament crimped yarn suitable for use in the manufacture of loop pile carpets is provided, comprising a continuous multifilament yarn with a crimped core and at least one crimped winding. Ru. The yarn is further characterized in that some filaments inside the yarn are lightly joined together and the yarn has a cylindrical bulk of about 70 to 852 mm of the core yarn. Cut lengths of thread at least 1 thread per inch (38 threads/11) after boil-off, preferably at least 2 threads per inch (79 threads/m)
It has a twist of In the product of the present invention, a core continuous filament yarn with one or more characteristics is arranged along the axis of the combined yarn, and at least partially around the core continuous filament yarn with one or more characteristics is arranged. The winding of the filament is surrounded by a thread, and this winding is irregularly reversed by 180° when the thread is under tension and observed around a short core thread, as shown in Figure 5A. The threads are wound in a coiled manner, the threads substantially contacting the core threads, and the combined threads boil the cut length of the threads.
At least 1 piece/inch (39 pieces/m) when turned off;
Preferably, for polyamides, the cylindrical bulk of the yarn for zero wraps, which has at least 2 twists/inch (79 twists/m) of non-directional twists, is approximately equal to that of the core yarn for polyamides. 70-85%, and 70-90 for polypropylene! Preferably, the yield crimp elongation of this yarn is about 20-4H. The content of uncrimped yarn in this system is less than 10%, and the uncrimped yarn can have antistatic properties. The yarn bundle can be substantially free of true twist. This does not exclude a small amount of twist occurring accidentally when handling the yarn bundle, for example when removing the yarn bundle over the edge in the usual way from a stationary package such as a spool rack. A bundle of yarn that does not contain more than about 1 true twist per 3 cm is considered to be substantially twist-free. The method for producing this multifilament)-crimped yarn suitable for use in the production of loop pile MJI
) supplying at least two crimped multifilament polyamide or polypropylene yarns under different tensions and in a pseudo-twisted state to a heating zone; (b) heating the simulated yarns with saturated steam; At least one thread of the crimped multifilament is subjected to a positive tension of about 0.02 to 0.25 g per denier, and at least one thread of the other crimped multifilament is are fed under a positive tension of about 0.012 to 0.18 g1d less than the first yarn, and the yarns are fed together into a heated section of pressurized steam where at least the surface filaments are mimetic. The yarn is camouflaged in such a way that it reaches a high enough temperature to lock in the wrapped state, so that while it is heated, the lower tensioned yarn wraps around the higher tensioned yarn. It is radially compressed and wound in the form of an irregularly reversed coil, then passed through a simulator and wound into a package. The tension on the first thread should be 0.04-0.18 gpd. Most preferably, the tension applied to the second yarn is between 0.032 and 0.10 gpd less than the tension applied to the first yarn.The heating zone is preferably a chamber with closely fitting inlet and outlet passages. 754,703, filed July 15, 1885, in which the yarn is laterally impinged with saturated steam as described in copending U.S. patent application Ser. It differs from that patent application in that the highly tensioned thread is densified by twisting while in the heating chamber, and its filaments are not free to separate and be heated individually or substantially entangled. Therefore, only filaments under low tension and filaments on the surface of high tension threads are fully affected by saturated water vapor. Deep penetration and torque potential are fixed.Low tension threads are fixed in the wound shape by the effect of water vapor and radial compression.The entanglement between low and high tension threads To a lesser extent, excessively high water vapor temperatures or excessively long exposure times can result in fusion of the entire system. The mimicking device preferably uses compressed air at ambient temperature to cool the twisted yarn. The fluid torque jet described in U.S. Pat. No. 3,079.745.
Sufficient to produce at least one, and preferably at least two, twists per inch (2,54 cm) of yarn when suspended in boiling water when cut into inch (2,54 cm) lengths must be operated under suitable conditions. When the yarn produced by the method of the invention is made into a loop pile carpet and heated, as in the case of latex treatment, scoring or dyeing, due to the mimicry fixed on the doubled yarn in the heating zone. , the tufts are twisted from their normal configuration to varying degrees. At the same time, high tension yarns shrink more significantly toward the backing fabric than low tension yarns. Twisting the tufts, especially the finely structured Mtm tact, involves spraying a high temperature dyeing solution onto the carpet surface or stirring the solution in a dyeing bath to create the twist. This can be facilitated by stirring during part of the heating process. The shrinkage is not uniform from tact to tact, both the takt and the shrinkage resulting in a beautifully irregular carpet surface cause the tact to move from its oriented position in all directions and to varying degrees depending on the yarn type and carpet configuration. Minimize directionality and visible columns. In fairly open carpet configurations, where the tufts are less constrained by adjacent tufts, the loops can be twisted and contracted more, hiding the lining much more effectively than regular yarns. . In addition to the twisting and shrinking behavior described above, a low tension yarn is wound around a high tension yarn in an inverted coil with irregular direction and frequency of reversals. This gives an irregular appearance, especially if the threads have different colors or dyes. As a result of the above-mentioned behavior, an optimal carpet rolled from the yarns of the present invention will not exhibit any change in appearance at the seams, even if parts of it are placed in the machine direction and other parts are placed in the transverse direction and fit together. It is not allowed. - the g-stripped yarn undergoes twist fixation in the heating zone;
The yarn also passes through the constrained inlet and outlet passages of the preferred steam heating device, and as a result of the steam impinging on the yarn and entangling the filaments, the filament loops at the surface are compressed into bundles. Despite the lack of true twist or significant degree of entanglement, it has sufficient cohesive strength to pass through the spools and needles of a tufting machine without problems. Since the yarn is twisted when the yarn is bombarded with saturated water vapor, the filament in the center of the core yarn is less processed than the filament on the surface of the core yarn. The filament of the yarn undergoes sufficient saturated steam treatment. The difference in the degree of steam treatment is essentially a difference in the properties and properties of the winding yarn and the core yarn. The freshly wound yarn package has a degenerate textured appearance, which is quite different from the smooth surface of typical isomeric continuous filament yarns. One of the functions achieved by applying different tensions is to facilitate twisting.0When twisting yarns under equal tensions, the outermost filaments will travel a longer distance than the innermost filaments. Because it travels, a large amount of tension is applied. The force required to tension these filaments is opposite to the force exerted by twisting;
Control the degree of twisting. When some threads are under low tension, these threads are easily wrapped around high tension threads. A given torque applied in the twisting device will therefore result in a much higher degree of twisting, especially if the twisting device is a fluid torque φ jet. To illustrate the above effect, three isomeric continuous filament Φ polyamide yarns, one of which appeared black, were fed into a process as shown in FIG. 1 below. All conditions are the same except that the tension on thread 10 is higher than the other two threads, designated as thread 11. A high speed flash photograph was taken of the yarn twist between the guide 16 and the heating zone 18. Table 1 B C Tension thread 101g 15.0 30.0 100.
Ogpd O,00,00B 0.028
Thread 11, g 15.0 15.0 15.
Ogpd O-00,0040,004 Average twists/inch 〇 2. Q G, Q pieces/
ra 35 79 238 It can be seen that applying different tensions increases the degree of twist by more than 6 times within the range of tensions mentioned above. Applying different tensions at the high and low tension ends will result in different degrees of twist, which will be determined experimentally. The different tension degrees must be thick enough to provide the above benefits, but also ensure that the higher tension yarn is stretched so much that its crimp is removed or the lower tension yarn is relaxed. The allowable tension difference between the yarns used must not be large enough to protrude from the doubled yarns and cause them to become entangled or unravel while being fed through the guide or needle of the tactifier. Varies depending on the type of. The tension difference is preferably about 0.008 to 0.24 g/denier, most preferably 0.028 to 0.155 g/denier. Referring to FIG. 1, one or more continuous filament polyamide yarns 10 and 11 are provided in a package 1.
2 and put them together at the guide 16 to form a bundle of yarn 14.
to the heating zone 18. This zone is preferably a device in which the yarn is treated by impinging the yarn bundle with high pressure saturated steam. Saturated steam is supplied from a source (not shown) and enters heating zone 18 through pipe 20. The treated yarn 22 then passes through an advance roll 24 to a winding package 28. The tensioning device 15 is placed on one or more supply systems, such as 10, to adjust the desired tension difference. The treated yarn 22 is twisted, and the yarn is treated with steam in a simulated state. Behind the torque jet 23 the applied twist returns to zero. FIG. 2 is a longitudinal cross-sectional view taken along line 2--2 of the preferred heating device 18 of FIG. This inlet is an elongated tube with a tight-fitting passage 30 through which the yarn bundle passes into a chamber 32 where a portion of the saturated water vapor flows from chamber 32 in a direction opposite to the direction of yarn movement. , the yarn bundle 14 begins to be heated. As the yarn bundle enters the chamber 32, saturated water vapor exiting the orifice 34 impinges on the chamber and the longitudinal axis of the yarn bundle, and then exits the chamber 32 through the closely fitting passageway 36 of the outlet 38. FIG. 3 is a cross-sectional view of the torque jet 23 of FIG. 1 taken along line A--A. The yarn 22 passes through a yarn path 40 where a rectangular air orifice 42 causes compressed air to impinge on the yarn 22 in the direction of the cut line, twisting the yarn in a counterclockwise direction. In the preferred embodiment of the invention shown in FIG.
At 6, the low tension thread 11 is combined with the high tension thread IO. The guide prevents the twist from moving back towards the tensioning device 15. Such a guide can have a V-shaped slot that grips the yarn, or it can be a pair of rotating rollers that grip the yarn between them. According to this arrangement, 1
The low tension thread 11 of the book is wrapped around the high tension thread 10 relatively uniformly along the thread. If two or more low tension threads are used, they are all wrapped at the same time and in approximately the same direction. When the twist of the thread 10 is not completely stopped by the guide 16, the thread 10 is twisted at the guide 16.
as well as! 1 and at the same time the angle between the high tension thread and the low tension thread is at least about 100 to prevent the low tension thread from wrapping around the high tension thread before reaching the guide 16. Almost the same uniformity can be obtained. In another preferred embodiment shown in FIG. 4, the guide 16 is a flat bushing or the like, and when the thread 11 wraps around the thread lO as it approaches the guide 18,
The twist of the thread 10 is returned to the tensioning device 15. As shown in FIG. 4, when yarn 11 meets yarn 10 at different locations, the yarns are out of phase with each other, giving a more irregularly twisted appearance. If the threads are introduced at the same location in such a way as to attach the guide 17, the threads will be wound in the same direction and in the same phase. If the location where the low tension thread meets the high tension thread is not fixed by a guide, the wrapping will be more irregular in pattern. By changing the location where the yarns are plied, the angle A between the high-tension yarn and the low-tension yarn, the absolute value of the tension, and the difference in tension between the two types of yarn, many windings can be made into a pattern. Can be done. The process is operated above about 2007 pm (18311 P@) and the position of the doubling is controlled by reducing the angle between the low tension yarn and the high tension yarn and/or by installing guides. By fixing, excess windings can be spun. If the angle between the low-tension thread and the high-tension thread is small, the difference in length between the filament and the core filament will also be small for one turn.On the other hand, as this angle approaches 90'', this difference will also increase. Figure 5A shows the yarn made according to Example 3, which is a 3x magnification after winding, full crimp development, relaxation in the form of skeins, and boiling off. A low tension winding is done by dyeing the thread darker than the core thread so that the wrapped features can be distinguished.The thread is placed under tension.A low tension winding is carried out around the high tension core thread 52. Because the angle at which yarn 50 is wound varies along the length of the yarn and is reversed at 54, the yarn in the rug is free from the undesirable "barber's rotation" seen with evenly twisted yarn. No pillars are shown. Figure 5B is the same thread as Figure 5A, but at 8x magnification. Figures 6A and 6B have a gauge of 1/8 inch (3,18 m).
m), a typical loop with 1/4 inch (8,38 mm) pile height, 10 stitches per inch (3,94 stitches/cm) at a basis weight of 24 oz/sq yd (814 g/m2) - Two diagrams showing a pile carpet, in which the tufts are arranged in a geometric row R when viewed from any direction. Figure 7A is a similar view to Figure 6A, but at 3x higher magnification of another typical loop pile MJe made from 5000 denier DuPont type 385A polyamide carpet yarn 4 wood. This is a diagram. This Mt& has a gauge of 5716 inches (3,98 meters) and a pile height of 1
72 inches (1,27 cm), basis weight 45 oz/sq yd (CC152G/FF12), 3.5 stitches per inch (1,38 stays, CH/C layers), and the tufts are geometric rows. They are lined up in an R shape. FIG. 7B is a side view of the tam of FIG. 7A at 3x magnification. Figure 8A is a similar view to Figure 68 at 3x magnification of the carpet made from the yarn of Example 6, showing the absence of rows. FIG. 8B is a view at 3x magnification showing that the loops are irregularly arranged from the viewer's perspective due to the changing direction and angle of the twisted portion 5G. As shown at 58, the tips of some of the tacts are bent. The tips of the loops are therefore out of geometric alignment in all directions, essentially eliminating the directional and columnar pattern. FIG. 9A and FIG. 9 are the same as FIGS. 8A and 8B for Example 7. 10A and 10B are the same views as FIGS. 8A and 8B for Example 9. Test Method: Dye filaments of different types in a sample of yarn for at least one day using a suitable conventional cross-dyeing method to obtain different colors or tones. Ta. Alternatively, the light dyeable filaments were left undyed. In the examples herein, the high tension core yarns were left undyed. 10-12 inches (25,4-30.
A 5cm length of cross-dyed thread was hung vertically and tied tightly with a simple top knot near the midpoint of the sample, with a 0.025 g/denier hook (4000 denier thread Attach a 100g weight to the Carefully cut the thread 2 inches (5.08 cm) below the knot into two pieces. Carefully comb through the tangle of threads below the knot using a thin wire brush, such as the one you would use to brush or raise the lash of suede leather. Length in one direction is 2 inches (5,08c+a
) on top of the black paper. Carefully cut the combed filament just below the knot. Using a tweezers, take five filaments from each component color and place them parallel to each other on the exposed side of the double-sided adhesive tape. The lined filaments are then covered with clear, single-sided adhesive tape to securely hold the filaments in place. Measure the length of each filament using a map range finder, such as a Keuffel and X.-1 Esser No. 820300. Repeat this operation until you have recorded 50 filament lengths for each color. The average of 50 measurements is calculated for each type of filament. The average values for the darkly dyed filaments are also averaged respectively. The combined average of all darkly stained filaments is then subtracted from the average length of the lightly stained filaments to calculate the percentage difference in filament length. Divide this difference by the combined average value of all darkly dyed filaments and multiply by 100 to obtain the percentage difference. Cut the cylindrical bulk boil-off and conditioned sample to a length shorter than the inner diameter of the test cylinder and determine the specific volume of the thread by carefully pushing the piston down into the cylinder until it comes to rest over the sample. . The piston is 3.1psi (21,
It exerts a pressure of 4 kPa) on the sample and has a calibrated handle for reading the volume occupied by the sample. Take a reading 100±5 seconds after the piston comes to rest; determine the specific volume by dividing the volume by the weight of the sample. The specific pressures used are considered representative of typical furniture in a jam. After boil-off, one end of the yarn with a length of 8 inches (15,14 cs+) without any twisting load was clamped and submerged in a heated dye bath. Keep it there until no more twist develops. To make it easier to count the twists, it is preferable that the yarns have differences in color or dyeability. After dyeing, place the twisted sample next to a ruler and count the number of twists per inch. count. The control yarn and the yarns of Examples 1 to 5 were made in the following manner. A continuous filament carpet yarn of nylon 66 having a standard texture according to FIG. 1 was fed into the process. Thread 10 is DuPont's 485 type 1225 denier light acid dyeable 4
97A BCF thread, the other two threads 11 are 487A
A dark acid dyeable thread of type 1245 denier,
It has an electrically conductive core filament to neutralize static charges. The heating device 18 shown in FIG. 2 has an inner diameter of 0.
080 inches (1,52+am), length 8 inches (20
, 3 cm) with a passage 30, diameter 0°04
6 inch (1,1? mm) water vapor orifice 34, diameter 0, H3 inch (1,51 mm), length 1.0 inch (2,54 cm) chamber 32. and an outlet 38 having a passageway 36 with an inner diameter of o, oeo inches (1,52 ply) and a length of 12 inches (30,5 cm). Torque jet 23 has an inner diameter of 0.093 inches (2,3El is)
thread passage 40 and length 0.120 inch (3,05 Il
! l), having a rectangular air orifice 42 with a width of 0.040 inches (1.02 mm) into which a pressure of 12
Compressed air at 0 psig (827 kPa) and a temperature of 25° C. is supplied. This is 15 inches from exit 38 (38,1c
It is located at m). The tension between the roll 24 and the take-up a2B is 175 g. Roll 24 is 500ypm
(45?spm) Te driven. For Example B, the thread 10 was DuPont Type 487 1.
245 denier dark acid dyeable 487A yarn, yarn 11 is 485 type 1225 denier yarn and 487A type 1
It was a 245 denier thread. Other conditions are Examples 1 to 5.
is the same as The yarn of Example 7 was made by feeding three BCF yarns as shown in FIG. The remaining steps not shown in FIG. 4 are the same as in FIG. Yarn 10 is DuPont type 494 1225 denier cation dyeable B.
They are CF yarns, and yarn 11 is a 495 type 1225 denier light acid dyeable yarn and a 497A type 1245 denier dark acid dyeable BCF yarn. The heating device 18 has an inner diameter of 0.
100 inches (2,54mm), length 8 inches (15,
Inlet 28 with passage 30 of 24 cm), diameter 0.07
8 inch (1,93a+m) steam orifice 34;
Inner diameter 0.10 inches (2.72 mIB), length 1.0
inch (2,54 cm) chamber 32 and inner diameter 0.110
inch (2,8sm), length 12 inches (30,5c
m) has an outlet 38 with a passage 36; Torque jet 23 has a diameter of 0.125 inches (3,18+a
ra), 1 inch (2,54 dragons) long thread passage 40
and 0.145 inch (3,88+am) long and 0.145 inch wide.
05Q inch (1.27 mm) rectangular air orifice 42 with a pressure of 120 psig (8
27 kPa) and compressed air at a temperature of 25°C. The yarn speed is 373 ypm (341 mp). Due to the method of winding the doubling yarn, larger equipment is required to accommodate larger diameters. 2nd A table comparison Denier of example yarn 10 1225 1225 1225 1
225 Tension of thread 10, g 30 100 10
0 Tension of 100 thread 10, gP(10,0240,0
800,0800,080 thread 11 denier 1245
1245 1245 1245 Tension of thread 11, g
30 30 10-20 10-20 Tension of thread 11, gPa O, 0240, 0240, 008-0,
008-0,0180,018 Tatewa water vapor temperature, 188 18B 168
1eft℃ Saturated steam pressure, 90 90 95 90si
g Saturated steam pressure, 821 821 815
e21Pa Total denier of yarn 3850 3850 3820 37
80 pieces/C scale 0.98 0.89 1.28 1.
48 Cylindrical bulk factor cc/g Total yarn bundle 5.70 5.00 5.15
Thread 10 8.10 fl, 20 8.
35 first thread 11 5.90 4.90
4.90 yarn 11/10. $87 79
75 second thread 11 5.30 4.85
4.95 yarn 11/10. $87 78
76 filament length thread 10, inches 2.02 2.01 2.02 2.
02 yarn 10. cm 5.13 5.11 5.1
3 5.13 thread 11, inch 2.02 2.20 2
．． 21 2.18 Thread 11. cm 5.13 5.
59 5. el 5.49 difference 1 inch 0 0
．． 19 0.19 0.14cra OO,
4B 0.48 0.38 Yarn IO
225 thread 10] Tension, g 100 100 1
00 100 thread 10f7) Tension, gpd O,08
00,0800,0800,080 thread 11 (7) tension,
g 10-20 10-20 10-20 10-
20 Threadwork 〇-Series 11 0.084-0.084-0
．． 0[(4-0,084-tension difference, gpd O,
0720,0?2 0.072 0.072 Saturated steam temperature, 184 182 184 174℃ Saturated steam pressure, 85 79 85 111s
ig Total denier of yarn 3800 3770 3850 39
70 pieces/cm 1.18 0.79 Cylindrical bulkiness cc/g Total yarn bundle 5.35 5.85 Yarn 10 B, 80 7.10 First yarn 11
5.10 5.50 yarn 11/10. $77
78 Second thread 11 5.10 5.75 thread 11/10.
$ 77 81 Filament length thread 10, inches 2.01 2.02 2.0
0 yarn 10, cta 5.11 5.13
5.08 thread 11, inch 2.21 2.12
2.20 thread 11, cm 5.81 5.38
5.59 difference, inch 0.20 0,10
0.20cm O,500,25
0,51 thread 10(7)X IO,OS 5.0
$10.0$Examples 2-5 are 188-16
Showing the effect of varying the temperature of saturated steam between 2°C, 16
At 0°C, the low-tension threads have very poor retention in the wound form, often separating from the high-tension threads, protruding from the surface of the wound package, and transporting the threads from the package into the hem tufting machine. When feeding, the tension can cause the thread to be pulled out, and the thread may become entangled in the guide tube of the bobbin shaft or in the needle of the tufting machine. Wrapping has been found to cause torque potential to be locked into the yarn at temperatures too low for the yarn to be properly heat set in its wrapped form. If the yarn speed is higher or lower than 500 ypm (457 mpm), it may be necessary to increase or decrease the temperature of the steam to obtain proper fixation. Observation of the sample by dyeing in the form of a skein, drying and suspending a 1ffi length from a raised clamp can demonstrate the unexpected properties of the yarn of the invention. The sample is first suspended by its own weight, and then the lower end is
Observation was made with a weight of 0 g attached. Table 3. Control yarns with all components under 30 g tension show no signs of yarn wrapping around other yarns; all component yarns are the same anywhere along the length of the control yarn. degree, indicating twist in the same direction. In both Examples 3 and 7, the core filament was 1
Pulling out to a length of inches (2,54 cm+), winding could leave the threads in an inverted form; then winding separates the threads from each other. In the case of winding in Example 7, when the core thread is pulled out, the thread becomes a hollow tube. When the weight is removed from the yarns of Examples 3 and 7, the yarns return to their original unweighted appearance and, at least during a small number of tensioning cycles, the winding is such that the yarns move away from the core yarn. There is no substantial separation. The above yarns of Examples 1 to 7 were tactified to have a gauge of 1/8 inch (1.18 cm) and a pile height of 1/2 inch (1.2 inch).
7cm), basis weight 45oz/square yard (152E1g
/m2), number of stitches 8/inch (3,54IC11
) It was made into a flat una loop carpet and Beck dyed without stirring. The hems made from the yarns of Examples 1-B were dyed in light and dark shades of reddish-brown. The three component yarns of Example 7 were dyed in light blue, dark blue and rust colors. All of the hemmings of the present invention exhibit irregularly twisted loops, which are displaced from the normal row-to-column arrangement, and present a distribution of color to the viewer. The surface of the hem stitch is uneven. The yarn made at the highest temperature of Examples 1-6 exhibits the stiffest feel and is suitable for high-traffic applications. The high temperature fixed double wrap of Example 7 makes the yarn particularly resistant to collapse and has adequate texture and coverage. Examples 8-11 In this example, Nelson U.S. Pat.
494 type 1225 denier cationic dyeable yarn, manufactured by DuPont, by the method described in No.
Type 5 1225 denier light acid dyeable yarn and 497
Pre-entangled 358A type 3775 denier A type 1245 denier acid dyeable yarns are each individually tensioned to remove substantially all cohesiveness and then intertwined with each other. Nylon 68 heather yarn is used as one component of the yarn of the present invention. The method was as shown in FIG. In Examples 8 and 9, the high tension yarn 10 is 122 of type 485.
Thread 11, which is a 5 denier thread and applies low tension, is 35
It is a 9A type 3775 denier thread. In Example 1O, the high tension yarn 10 is a 358A type 3775 denier yarn and the low tension yarn is a 495 type 12 yarn.
It was a 25 denier thread. In Example 11, it is the opposite of Example 10, and the thread 10 is two 485 type 1225 threads.
denier yarn, and yarn 11 was a 359A type 3775 denier yarn. The dimensions of the heating device 18 and the torque jet 23 are the same as in Example 7, but in Examples 10 and 11 the air pressure of the torque jet is 150 ps.
ig (1034 kPa). The yarn speed is as in Example 8.
and 9, it was 500 ypm (457 mpm), and in Examples 10 and 11, it was 750 ypm (885 mpm). The yarns of Example Day and 9 were tufted in the same manner as in Example 7, with a gauge of 1/8 inch (3.18 mm) and a pile height of 1.
It was made into a flat loop jam of 72 inches (1,27c), basis weight 40 oz/square yard (1358g/s2), stitch count 7/inch (2,7B/c+s), and dyed without stirring. The yarns of Examples 10 and 11 were tactified in the same manner as Examples 7 to 9, and had a gauge of 5/32 inch (3,97 layers 11) and a pile height of 1/2 inch (11 layers).
, 27 cm), basis weight 45 ounces/square yard (1358
g/m2), number of stitches 8/inch (3,15/c
M) was hemmed and dyed. Examples 10 and 11 demonstrate the flexibility of the design structure in the method of the present invention, Example 10
The seams were primarily light blue with dark blue and rust-colored spots. Example 11 by reversing the component yarns
The hem seams became predominantly dark blue with light blue and rust-colored spots. Example 12 This example illustrates the light bonding of several filaments together. The yarns of Examples 2-5 were thoroughly tested as follows. In order to avoid disturbing the structure of the thread, the thread was embedded in an epoxy matrix before making the cross-sectional cut; to do this, the sample thread was placed in a mold. The cured block of specimen, around which epoxy is poured, is removed from the mold, shaped, and cut with a microtome. Place the cross section on a microscope slide and take a photograph at appropriate magnification. Lightly spray the coated mold with mold release agent and line each cavity with cellophane tape. Place a small "pillow" of double-sided shielding tape (approximately 8 layers) at the end of each cavity. Before putting the thread into the mold, I made the thread as follows. Tape both ends of the approximately 2001 wet thread using a small piece of shielding tape, attach clamps to both ends, hang the thread from the hooks of the rack, and place a weight on the lower clamp with enough weight to stretch the crimp. Attach, being careful not to stretch the thread, use an eye dropper to place a few drops of clear acrylic lacquer under the thread at a time. After about 10 drops at about 3 minute intervals, it is dried for about 2 hours. Place the coated sample on a "pillow" of tape in the cavity of the mold so that the threads are on the surface of the mold but not touching the bottom. Cut off excess thread. The epoxy resin that filled the eight cavities was made by mixing the following ingredients. Marglas resin 11t58 2
1.7g colorless and transparent epoxy casting resin

[Aku7 Chemicals and Insulaic 1n.
Company (Acme Chemical & In5u)
ration Co.] Marglas resin C5θ 4.
4g Colorless and transparent epoxy casting resin [J Maraset modified diamine manufactured by Aku7 Chemicals & Insulation Co., Ltd. 25.0
g Hardener Hardner 558

[Ac7 Chemicals and Insulation Company] Stir the resin mixture slowly for about 5 minutes to prevent the formation of bubbles; stirring must be continued until the solution becomes clear. Next, pour the epoxy solution onto each sample and move the sample using a pair of tweezers to remove any bubbles. If the sample sinks to the bottom or floats on the surface of the mold, the thread must be replaced again;
It can be cured in 8 hours (or 3 hours at 85°C). After curing, place the room-temperature cured mold on a heating table for about 15 minutes, grab the edge of the cellophane tape, and the warm sample block can be removed from the mold. (
The oven-cured specimens are removed from the mold immediately after removal from the oven.) Cool the specimen block on a flat surface and remove the cellophane tape. Shape each sample block and place it on a heating table for about 2 minutes to relax the filament. Next, transfer the sample block to a microtome [Rotary type 820
, American Optical
1 (manufactured by Tical) and cut to a thickness of 7 microns. Discard the first few pieces. Good cut piece (
No air bubbles or knife blade marks are evident, or the filament is not tilted).
imal) 335 (n-1,5) or mineral oil (n-1,
47) onto a thinly coated microtome slide. Once the section has been examined under a microscope and is deemed satisfactory, a cover glass is placed over the specimen. Take a photo at an appropriate magnification. The cross-sectional photographs of the yarn showed that the fusion point increased as the water vapor temperature increased, and that the fusion point decreased when processed to MI2. The fusion point is determined by examining cross-sectional photographs to see if the boundary between the two touching filaments is blurred. This is illustrated by FIG. 11, which is a cross-sectional photograph of the yarn of Example 3. In Examples 13 to 16, a 1250 denier blue polypropylene multifilament yarn 10 was subjected to a tension of 100 g and was doubled with a 750 denier colorless polypropylene yarn 2 subjected to a tension of 20 g. The filament had a rounded square cross section with four continuous voids. The heating device has an inner diameter of 0°070 inch (1 day).
, 78 mm), 8 inches (20,3 cm) long passageway 3
Inlet 28 with 0, 0.074 inch (1,88
water vapor orifice 34 mm), internal diameter 0.104 inch (2,64!1111), length 1.0 inch (2,5
4 cm) and an inner diameter o, oeo inches (1,5
2++ us), ID 0.070 inch (1,78 gm)
, with an outlet 38 having a passageway 36 12 inches (30.5 cm) long. The torque number jet 23 is the same as in Example 7, but the pressure is 80 pgig (551 kPa).
), compressed air at a temperature of 25°C was supplied. Yarn speed was 500 ypm (457 mpm); other conditions are listed in Table 5. The core filaments of Example 13 adhered lightly but separated easily. It is difficult to separate the wrapped thread. Example 14~
In No. 16, cohesiveness increased with increasing water vapor temperature. Example 17 had severe fusion and was unacceptably stiff for use in edge stitching. Length of main thread 10 - Filaments are heavily fused and cannot be separated enough to allow reliable length measurements. Zero threads 10 and 11 were fused together. The core filaments of Example 13 adhered lightly but separated easily. The threads marked with @ are difficult to separate. Example 14~
In No. 16, cohesiveness increased with increasing water vapor temperature. Example 17 had poor fusion and was unacceptably stiff for edge use, but was suitable for industrial use. The yarns of Examples 13 to 17 were tufted, and the gauge was 1/8 inch (3.18 inch) and the pile height was ? /18 inch (11
, 2 Peng ■), basis weight 40 ounces/square yard (1350 g
/ shoe 2), cut pile edge with 8 stitches (3,54/am). The edge of Example 13 had a feel similar to soft cotton, but its properties as a rug were poor. The edge of Example 17 had a hardness close to that of artificial grass. The edges of Examples 14-16 were intermediate. Polyamides and polypropylene are preferred polymers for the yarns of the present invention due to their general suitability for edges and their ability to retain crimp and integrity at the temperatures necessary to set the twist and bond the filaments. It is. A polyamide or polypropylene copolymer with suitable twist fixation and filament bonding properties at a given yarn speed and steaming conditions can be selected as a core or winding component to obtain specialized products. Similarly, a polypropylene core thread is used together with the polyamide thread, the high melting point polyamide is directly exposed to water vapor, and the low melting point twisted and densified polypropylene is treated primarily on its surface. Can be done.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a preferred method of the present invention, FIG. 2 is a schematic diagram of a preferred heating device, FIG. 3 is a schematic diagram of a preferred torque φ jet device, and FIG. 4 is a schematic diagram of a preferred method of the present invention. FIG. 2 is a diagram illustrating the method. Figures 5A and 5B are side views of the yarn of Example 3 at magnifications of 3 and 5. Figure 6A is a typical loop fist pile hem stitch viewed along the length of the lining in the direction of movement of the lining;
View B is the same loop pile edge looking along the lateral direction of the lining in the direction of movement of the lining. FIG. 7A is a typical loop pile Mm viewed at high magnification, and FIG. 7B is a close-up, enlarged side view of the edge of FIG. 7A. Figure 8A shows the loop pile edge of Example 6, and Figure 8B shows the edge of the loop pile of Example 6.
FIG. 3 is a close-up, enlarged side view of the textile fabric of FIG. 9th A and 9B
The figures are similar to FIGS. 8A and 8B for Example 7, and FIGS. 1OA and 108 are similar to FIGS.
It is a figure similar to FIG. A and FIG. 8B. FIG. 11 is a photograph of a cross section of Example 3. 1 other person FtG, 5A Fig, 58 FfG, 6A RRRRRR FIG, 68 RRRRR FIG, 7A FIG, 78 FiG, 8A FIG, 88 FIG, 9A Procedural amendment April 9, 1988 Commissioner of the Japan Patent Office 1k Mr. Akira Kuchi 1. Indication of the case Patent Order No. 1145 of 1988 2. Name of the invention Mimic thread with different tensions 3. Relationship with the person making the amendment Patent applicant name Name E.I. Dupont de Nimois・And Company 4, Agent Postal code 107 5, Date of amendment order (voluntary) - 66th case amendment, Type sheet of "Detailed description of the invention" in the ice specification (1) Specification slip, page 21, 12-13 In the line, ``the place where the high tension thread meets'' should be corrected to ``the place where it is introduced.'' Procedurally 〇 Masa certain F (method) % formula % 1, Indication of the case 1988 Patent 'H No. 1145 2, Name of the invention ``j2 twisted yarn 3 with different tensions, Person making the amendment'' Related Patent Applicant Name: E.I. Pont de Nemois & Company 4, Agent: 107 Telephone: 585-2256 5, Date of Amendment Order: March 31, 1932 (Shipping Date)
6. The words ``3 and 5... are true'' in the 18th line of the 50th page of the amendment to the 13th line of page 51 of the amendment shall be corrected as follows. Figure 6A is a side view photograph showing the shape of the yarn of Example 3 in v5; Figure 6B is a photograph showing the shape of the same loop seen along the lateral direction of the lining in the direction of movement of the lining.
It is a photograph showing the shape of the fibers of pile carpet. FIG. 7A is a high magnification photograph showing the fiber shape of a typical loop pile edge, and FIG. 7B is a close-up side view showing the fiber shape of the carpet of FIG. 7A. FIG. 8A is a photograph showing the shape of the fibers due to the loop-pile edges of Example 6, and FIG. 8B is a close-up enlarged side photograph showing the shape of the fibers of the fiber cloth of FIG. 8A. Figures IjS9A and 19B are photographs similar to Figures 8A and 8B for Example 7,
10A and 10B are the 8th ArS! for Example 9!
This is a photograph similar to Figures I and 8B. FIG. 11 is a photograph showing the cross-sectional shape of the thread of Example 3. ”

Claims (1)

[Claims] 1. Consisting of at least one crimped continuous multifilament core yarn and at least one crimped continuous multifilament wrapped yarn, the filaments of the wrapped yarn being the core yarn of the core yarn. A crimped continuous multifilament polyamide yarn suitable for use in the manufacture of loop pile carpets characterized by being 1 to 14% longer than the filaments. 2. Consisting of at least one crimped continuous multifilament core yarn and at least one crimped continuous multifilament wrapping yarn, the filaments of the wrapping yarn being 1-14% larger than the filaments of the core yarn. A crimped continuous multifilament polypropylene yarn suitable for use in the manufacture of loop pile rugs characterized by its long length. 3. The yarn according to claim 1 or 2, wherein some filaments of the wound yarn are lightly joined to each other. 4. The yarn according to claim 2, wherein the cylindrical bulk of the wrapped yarn is about 70 to 90% of that of the core yarn. 5. The yarn according to claim 1 or 2, wherein the number of twists after boil-off is at least 1 twist/inch (39 twists/m). 6. The yarn according to claim 5, wherein the yarn has substantially no true twist. 7. The yarn of claim 1, wherein the number of twists after boil-off is at least 2 twists/inch (79 twists/m). 8. The yarn according to claim 3, wherein the winding yarn is wound in an irregular inverted coil shape around the core yarn. 9. The yarn of claim 3 further comprising less than 10% of uncrimped filaments. 10. The yarn according to claim 9, wherein the uncrimped filament has antistatic properties. 11. A yarn according to claim 5, wherein the core yarns are aligned along the axis of the yarn, the axis running in an irregular inverted coil around the circumference of the short core yarn. 12. The yarn according to claim 1, wherein the cylindrical bulk of the wrapped yarn is about 70 to 85% of that of the core yarn. 13. The yarn according to claim 1, wherein the crimped core yarn is polypropylene. 14. (a) passing at least two crimped polyamide multifilament yarns under different tensions and in a false-twisted state through a heating zone; (b) heating the false-twisted yarns with saturated steam; c) A process for producing crimped continuous polyamide multifilament yarn suitable for use in the production of loop pile carpets, comprising the step of subjecting the yarn to a false twist. 15. (a) passing at least two crimped polypropylene multifilament yarns under different tensions and in a false-twisted state through a heating zone; (b) heating the false-twisted yarns with saturated steam; c) A process for producing crimped continuous polypropylene multifilament yarn suitable for use in the production of loop pile carpets, comprising the step of subjecting the yarn to a false twist. 16. about 0.02 to 0.25 gp in at least one of the high tension yarns of the crimped multifilament yarn;
d and at least one of the other lower tension threads of the crimped multifilament yarn is about 0.00
The tension of the yarn under tension is 8 to 0.16 gpd, and the tension of the yarn under low tension is 0.012 to 0.
．． 16. A method according to claim 14 or 15, which is 16 gpd lower. 17. The method according to claim 16, wherein the yarn is false-twisted in a torque jet. 18. The method according to claim 17, wherein substantially no water is trapped in the saturated steam. Claim 18 further comprising the step of winding the yarn at a winding speed greater than 19,200 ypm (183 mpm).
The method described in section. 20. The method of claim 18, wherein the angle between the high tension yarn and the low tension yarn at the location where the yarns are plied is at least about 10 degrees. 21, about 0.04 to 0.16 gp in at least one of the high tension yarns of the crimped multifilament yarn;
16. The method according to claim 14 or 15, wherein the tension of the low tension yarn is 0.032 to 0.10 gpd lower than the tension of the high tension yarn.