JPH0135096B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention is used for water jet looms and air jet looms (hereinafter referred to as jet looms) that weave at high speeds of 500 revolutions per minute or more.
The present invention relates to a method for warping synthetic fiber non-sized yarn. Conventionally, the majority of warping has been carried out in parallel with sizing, using the warping slasher method, which has been adopted for warping warps used in shuttle looms, innovative looms such as jet looms and rapier looms. However, in recent years, attempts have been made to omit the sizing process to save energy during preparation and processing, as well as reduce costs, and some brands have already begun implementing this and have established a route for it. For example, the use of non-sized yarn in high-speed looms running at speeds of 500 times per minute or more is also being considered, mainly for water jet looms. However, high-speed weaving using non-sized yarns has the problem of generating warp fuzz, which necessitates a lower operating rate compared to sizing yarns.To counter this, various techniques such as increasing the degree of interlacing, oiling, waxing, etc. Countermeasures have been taken, and one effective measure is to use twisted yarn to prevent the occurrence of fuzz and increase the operating rate. The inventor of the present invention found that most of the areas where warp fluff occurs frequently in the fabric during weaving are the selvage yarns, that fuzz occurs in the selvage yarn area on the nozzle side due to single filament breakage, and that in the selvage yarn area on the waste yarn side on the opposite side of the nozzle, fluff occurs due to breakage of the single filament. The occurrence of nap-like fuzz due to defects was confirmed in a long-term running test using interlaced yarn at high speed weaving in a water jet loom. In other words, it has become clear that how to prevent the occurrence of fuzz at the selvage yarn location is a major point that determines the operating rate during high-speed weaving using non-sized yarn. Therefore, it can be seen that it is sufficient to use twisted yarn with high binding property in the selvage yarn portion. However, there are also problems in warping using this twisted yarn as the selvage yarn. In other words, by making only the selvage yarn into a twisted yarn, the actual fineness becomes thicker than the ground yarn, so the rough winding beam has a high selvage height, and even if this is wound back to the warp beam, this tendency does not change; It becomes taller and the rolled up diameter becomes thicker only at the ears. This is not a particular problem in the case of beams with relatively small winding diameters, such as those used in shuttle looms, but in high-speed looms that require a large number of windings, such as jet looms, the winding diameter becomes large. Therefore, the ears are high,
During weaving, the length of unwinding from the warp beam becomes longer during weaving, resulting in uneven warp tension, which causes collapse of the selvage layer and loosening of the selvage threads, making it impossible to weave. Therefore, there arises an inconvenience in that the number of lines must be limited unavoidably. Also, currently the average rotation speed of the water jet room is
The rotation speed is 400 to 500 times per minute, but if the rotation speed is higher than this, the warp tension and the pump injection force must be increased. This is because it is necessary to increase the warp tension so that opening and closing can be performed quickly and accurately, and to increase the weft insertion speed by increasing the pump jetting force to cope with high-speed insertion. However, as the rotation of the nozzle side selvage yarn increases, in addition to the increased tension described above, high tension is added to the nozzle side selvage yarn due to the increased degree of interlacing with the weft yarn before cutting. The tension is much higher than that of the waste yarn side selvage yarn, which causes weave shrinkage, and the aforementioned single filament breakage continues to increase, resulting in more and more fluff. On the other hand, the thread on the waste thread side has a low tension, and in the case of a water jet loom,
Due to the increase in jetting power, the jetted water with increased scattering power comes into contact with the product, resulting in more opening defects and the occurrence of nap-like fuzz. The application of high tension to the nozzle side selvage yarns occurs particularly when the nozzle side selvedge yarns are closed; that is, when the weft yarns are ejected, all the warp yarns maintain a nearly uniform tension, but when the weft yarns are closed and knitted, they are gripped by the grippers. The fixed weft portion on the nozzle side is squeezed by the reed end between the gripper and the heat cutter until it is cut by the heat cutter. Therefore, the tension in the weft section suddenly increases, and due to this high tension, the degree of intersection with the nozzle side selvedge warp that intersects with the weft section increases, and the warp is greatly bent, so high tension is applied to the warp. As the filament is added suddenly, single filament breakage occurs frequently and fluff tends to occur frequently. In addition, the reason why the waste yarn side selvage yarn has low tension is that, unlike the weft portion on the nozzle side, the waste yarn side weft portion is not gripped and fixed with something like a gripper, and the weft end This is because the warp threads are not bent significantly because they are woven in a loose, jumping-back pattern. As the rotational speed of the jet room increases, the jetting force of the pump increases, so in the case of a water jet room, the scattering force of the jetted water increases, and the jetted water may collide, as described above. As a result, the impact applied to the open warp yarns, which have become low in tension, becomes stronger, which increases the rate of shedding failures and tends to increase the nap-like fuzz. The above tendency becomes more pronounced as the rotational speed of the jet loom is increased and the weaving speed is increased. An object of the present invention is to provide a warping method that can solve the above problems. That is, when warping a synthetic fiber non-sized yarn to be used in a jet loom that rotates at a high speed of 500 times/min or more, the present invention arranges twisted yarns only in the warp of the selvage yarn part, and creates a zigzag reed pitch in the warp selvage part. 10 to 50% coarser than the ground thread part, and the selvage thread winding tension is 20 to 70% lower on the nozzle side and 20 to 70% higher on the waste thread side compared to the ground thread winding tension. This is a distinctive warping method. The configuration of the present invention will be explained in detail below. That is, as described above, the problem when high-speed weaving is performed using a jet loom with a rotation speed of 500 revolutions per minute or more using synthetic fiber non-sized yarn is a reduction in the operating rate due to the generation of fuzz. In the present invention, the occurrence of fuzz is prevented by using twisted yarn only in the selvage yarn portion where fuzz is frequently generated.
In order to avoid that the warp beam becomes selvedge height during warping and causes uneven warp tension during weaving, the zigzag reed pitch of the warper selvage is first changed to make it coarser than the reed pitch of the ground yarn portion. The purpose of this is to reduce the overlap between yarns by coarsening the warp yarn density in the selvedges, thereby preventing the selvedges from becoming too high. The degree of roughening varies depending on the number of windings, yarn type, and number of twists, but by making it coarser in the range of 10 to 50% than the ground yarn reed density, the selvage height will be eliminated and the beam surface will be equal. Becomes high. In addition, to change the pitch of this zigzag reed, you simply need to remove the ears and replace it with one of the appropriate pitch depending on the yarn used, but this does not require complicated equipment or a lot of effort. There is no such thing, so there is no increase in production costs. Now, while taking such measures to prevent high fluff, we also take measures to prevent fuzz by using twisted yarn with high binding properties in the selvage yarns where fuzz is frequently generated. The use of twisted yarns alone is not sufficient; high tension is applied to the warp on the nozzle side edge by the driven weft, causing breakage of the single filament. It is also necessary to take measures to prevent the nip-like fuzz caused by poor opening due to the low tension of the weft and the increased scattering force of the weft conveying fluid. For this purpose, as a result of investigating the tension behavior during weaving using nylon and polyester yarns, we found that during warping, the selvage yarn winding tension on the nozzle side was lower than the base yarn winding tension, and the selvage yarn winding tension on the waste yarn side was I learned that the above objective can be achieved by increasing the tension. The extent of this is that the selvage yarn winding tension on the nozzle side is 20 to 70 compared to the ground yarn winding tension.
%, and the result was that it was sufficient to increase the selvage yarn winding tension on the waste yarn side by 20 to 70%. Note that if the adjustment is made outside of this range, there will be a tendency for ears to hang or become loose, so it is necessary to make adjustments within this range. Examples of the present invention will be listed next, but the technical scope of the present invention is not limited thereby.

[Table] Using non-sized nylon yarn semi-dull 70d/16f, the untwisted yarn of the nylon yarn is used for the ground yarn part, and the S of the nylon yarn is used for the selvedge part, each with 60 pieces (right). Twisted yarns each having a twist of 300 times/M were arranged and warped using the zigzag reed pitch and warping tension according to the method of the present invention described in column (a) of the table above. Using Tsudakoma WJL ZW-200, weaved taffeta with a total warp and warp density of 210/inch.
As a result, although 250 threads were rolled up by warping, the selvage height was not reached, and the nozzle side selvage thread tension and waste thread side selvage thread tension during weaving were both equal to the ground thread tension as shown in column (a) of the table above. The tension was almost the same, and the tension did not become high or low. Therefore, the generation of fuzz was significantly reduced compared to the conventional method, and a high operating rate could be ensured. In contrast, the conventional method of zigzag reed pitch and warping using warping tension described in column (b) of the table above was installed on the same Tsudakoma W/J/L ZW-200 with the same rotation speed. When weaving the same taffeta, warping reached a limit of 120 threads, and anything beyond that caused the selvage layer to collapse. In addition, during weaving, the tension between the selvedges fluctuates greatly, resulting in an unstable state, and at the nozzle side selvage threads, single filament breakage occurs due to the high tension, and fuzz occurs frequently, and the number of stops due to the fuzz on the selvedge warp yarns. As shown in the table above, the number of cases was much higher than that of the method according to the present invention, and the operating rate was low. As mentioned above, when warping synthetic fiber non-sizing yarn used in jet looms that perform high-speed weaving of 500 times/min or more, twisted yarn is used only in the selvedges, and warper selvage yarn is used to prevent the resulting selvage height. The combination of making the zigzag reed pitch in the yarn section coarser than the reed pitch in the ground thread section and making the winding tension at both ends lower on the nozzle side and higher on the waste yarn side than the winding tension in the ground yarn section. By this,
It is possible to significantly prevent the generation of fuzz and ensure a high operating rate of the jet room. Note that this effect is the same even if a single yarn of different fineness, which is different from the ground yarn, is used as the selvage yarn.

Claims (1)

[Claims] 1. When warping synthetic fiber non-sized yarn for use in a jet loom that rotates at high speeds of 500 times/min or more, twisted yarns are arranged only in the warp of the selvage part, and the zigzag reed pitch of the warper selvage part is 10% smaller than that of the ground thread part. Roughen the yarn in the range of ~50%, and set the selvage yarn winding tension to 20 to 70% of the ground yarn winding tension on the nozzle side.
A warping method characterized by winding up the waste thread 20 to 70% higher.