JP2020200570A - Method for producing free-cut warp knitted fabric based on rsj warp knitting machine - Google Patents

Abstract

To provide a method for producing free-cut warp knitted fabric based on a RSJ warp knitting machine.SOLUTION: A method comprises the steps of preparing a lap thread of dry spinning spandex or a naked thread of extra-fine dry spinning spandex, and warping the lap thread of the dry spinning spandex or the naked thread of the extra-fine dry spinning spandex at a certain draft ratio, the warping step including a step that is used to select corns with a same weight for warping in which the weight deviation rate is controlled within 3%, and upward and downward tension deviations are controlled within 1 cN, and a step of forming a fabric structure with the mixture of chain knitting, tricot knitting, and fleece cord by feeding the lap thread of the dry spinning spandex into a hole of a jacquard guide bar of a RSJ warp knitting machine or feeding two of the naked threads of the extra-fine dry spinning spandex or other knitting material threads into the hole.SELECTED DRAWING: Figure 2

Description

The present invention relates to a method for producing a free-cut warp knitted fabric based on an RSJ warp knitting machine.

Unlike a multi-bar Russell machine with at least 18 pattern guide bars, a jacquard warp knitting machine consists only of multiple guide bars with jacquard devices. In that case, RSJ series jacquard warp knitting machines are widely used to produce various warp knitting pattern fabrics due to the new piezo jacquard system and its excellent performance. Fabrics knitted by RSJ series jacquard warp knitting machines (RSJ fabrics) are increasingly used in the form of clothing fabrics, decorative materials, and industrial materials, and the development and use of RSJ fabrics is rapidly increasing in the market. Change. Conventional fabrics easily fray under the action of external forces (including cleaning, tension, etc.) in the direction opposite to the knitting direction. The anti-fray properties of current RSJ fabrics are usually improved by increasing the number of picks and finishes of the machine during knitting in the warp direction, but this method significantly increases the cost of RSJ fabrics and free cuts. The function of is not fully realized.

Cutting RSJ fabrics, which features free-cutting, requires a high degree of freedom, which significantly reduces the remaining odds and pieces in the manufacturing process and requires energy savings. Therefore, research and development on how to control costs and deliver good free-cut performance is well received by the market.

The main purpose of the present application is to provide the RSJ fabric with good anti-fray performance, reduce the warp knitting density, and increase the fiber elasticity without losing the fiber feel of the RSJ fabric and adversely affecting the appearance. is there.

In the present application, a knitting method based on an RSJ type warp knitting machine is proposed to solve a problem in the art. Raw materials with dry-spun spandex wraps or double-threaded extra-fine dry-spun spandex bare yarns and separate knitting yarns have been adopted and these raw materials. The uniform draft ratio of is achieved by the specific warp control of the present invention. RSJ-type warp knitting machines alternate between raw materials with dry-spun spundex wrap yarns, or extra-fine dry-spun spundex bare yarns and another knitting yarn that are threaded through a jacquard guide in multiple wales. By knitting, it may be used to form a base texture with a mixture of chain knitting, tricot knitting, and lined cord knitting, and based on such texture, the stitches are in the warp direction. And in the weft direction, it is more strongly contracted by the elastic yarn material to hold the other yarns tightly together, thereby knitting the stitches tightly and making it difficult to loosen in many directions, thereby making it conventional. Goodly eliminates conflicts between fray prevention, feel, cost, etc.

The embodiments of the present invention realized by the use of a wrap yarn material with dry spun spandex do not involve the need for modifications to the stand configuration of the RSJ warp knitting machine and thus have a higher degree of freedom in the choice of machine stand. It is a feature.

The embodiments of the present invention realized by the use of a material having an extrafine dry spun spundex bare yarn and another knitting yarn (eg, jacquard knitting yarn) threaded in a jacquard guide are two separate embodiments. Yarn (ie, jacquard knitting yarn and bare yarn of ultra-fine dry spun spundex) is fed simultaneously into the same hole in the jacquard guide bar by installing a set of yarn delivery system, yarn feed system, and column fixing system. It is characterized by being able to be.

To achieve a uniform draft ratio of dry-spun spandex wrap or ultrafine dry-spun spandex bare yarn, and thus to facilitate knitting with jacquard bars, the present invention provides a uniform warping control system. Developed using.

The method according to the invention is (unlimited) for RSJ5 / 1 or RSJ5 / 1EL type warp knitting machines having, for example, two jacquard bars, three knitting ground bars, and one inlay bar. Applicable. Jacquard bars can be used primarily for knitting patterns and textures, interlining bars can be used primarily for knitting textures, and inlay bars are primarily elastic raw materials. Can be used to send.

The RSJ free-cut fabric produced by the method of the present invention has excellent warp and weft elasticity and resilience as well as other good qualities, in addition to anti-fray and soft and comfortable feel.

Hereinafter, in order to explain the present invention more clearly, an exemplary embodiment rather than a limited embodiment will be introduced in combination with the accompanying drawings.

FIG. 3 is a schematic view of a stitch structure knitted with a bare yarn of ultrafine dry spinning spandex and another known knitting yarn, two threads threaded into a jacquard guide according to the present application. It is the schematic of the yarn delivery unit of the improved RSJ warp knitting machine by this application.

Hereinafter, the technical solutions of the embodiments of the present application will be described clearly and thoroughly. It is clear that the embodiments described are only part of, but not all, of the embodiments of the present application. Based on the embodiments herein, any other embodiment realized by one of ordinary skill in the art without creative action is included within the scope of protection of the present application.

The present invention provides a method for producing a warp knitted fabric with an RSJ warp knitting machine, and the fabric produced by this method has preferable free-cut characteristics and various wearing characteristics. Such knitting methods use a raw material with dry-spun spandex wrap yarn, or a raw material with extra-fine dry-spun spandex bare yarn and another knitting material yarn that is threaded through a jacquard guide for a particular texture. The structure can be formed in the RSJ warp knitting machine in the following manner. That is, a single warp is knitted alternately on several wales, making the stitch completely tight in the warp and weft directions.

Embodiment 1 of the present invention is realized by knitting a wrap yarn of dry spun spandex.
1. Wrap yarn with dry spun spandex is prepared instead of the traditional knitting material.
2. Wrap yarns with dry spun spandex are wound around the warp beam by a particular warp so that each wrap yarn on the warp beam has a uniform draft ratio.
3. Certain anti-fray texture structures are RSJ warp so that a single warp is knitted alternately in several wales, making the stitches completely drawn and tight in the warp and weft directions. Formed by a knitting machine.

The present invention requires that the fiber stitches can be tightly woven between the courses. Dry-spun spandex wrap yarns meet this requirement very well. Dry-spun spandex wrap yarns consist of core yarns (ie, superelastic dry-spun spandex yarns) in which outer filament yarns or outer staple yarns are wrapped externally. The outer yarn spirally wraps the core yarn to form a composite wrap yarn. This composite wrap yarn has smoothness and smoothness with good bulk and bulge, less fluffing, higher strength and less breakage. The composite wrap yarn may be formed of suitable core and outer yarns according to actual requirements, the strength of which is higher than any of the individual yarns. In the knitting process, this high-strength yarn is very important in terms of efficiency and quality.

Wrap yarns with dry-spun spandex are formed by dry-spun spandex core yarns that are spirally surrounded by extrafine outer yarns and have good elastic elongation and resilience, and have good heat shrinkage properties. In addition, the wrap yarn stitches firmly fix the legs or underwraps of other yarns in the warp and weft directions into the stitches of those wrap yarns, and realize fray prevention characteristics from all angles and free cut. It is possible to attract as many wales as possible to achieve the function. Preferably, an ultrafine, highly elastic material can be used as the outer yarn to wrap the yarn of dry-spun spandex, which is also accompanied by good wearing comfort and a number of other excellent wearing properties. It gives the dough a great feel and significantly reduces the dough density (and thus reduces the cost of raw materials).

Since wrap yarns with dry-spun spandex have certain elastic elongations to ensure the certainty of the knitting, a constant draft ratio of elastic composite yarns is specified to achieve constant tension in the knitting. It may be guaranteed only through the warping process of.

Knitting on an RSJ warp knitting machine requires that the warping causes the raw material to be wrapped around the warping beam as a package that can be used on this machine. Spandex yarn is highly elastic and can be stretched 6-7 times. In order to achieve a high constant draft ratio of each yarn on the warp beam, it is necessary to strictly control the warp tension of the wrap yarn material provided with dry spun spandex. For this purpose, it is necessary to use the original cones of the same size for aging and select cones with the same weight for warping by the weighing method, and the weight deviation rate is within 3%. Should be controlled by. In the warping process, the upward and downward deviations of tension are controlled within the range of 1cN, preferably the height of the damping level of the warping tension device is detected one by one. In addition, the final draft is tightly controlled during warping, and each cone of the same mass must be warped with threads of the same length to achieve the goal of uniform tension. Moreover, when using these cones, the cones in the same raw material box should be avoided from being attached to the same thread stand of the warp machine.

In addition, the influence of the geological structure on the free-cut characteristics is very important. A common mechanical type of ground structure is formed from chain knitting so that the warp forms a stitch on one wales and is limitedly associated with other stitches in the weft direction. In the present invention, the texture structure with a mixture of chain knitting, tricot knitting, and fleece cord knitting is formed by an RSJ warp knitting machine, which alternately knits threads in different wales and at different levels. Superimposes and interlocks on other threads to achieve anti-fray properties from all angles.

The method in this embodiment, in which the free-cut product is formed on an RSJ warp knitting machine by using a composite wrap yarn with dry spun spandex, is widely and commonly used without the restrictions of a machine stand, but is specific. A warping control system is needed to ensure constant draft ratio.

Embodiment 2 of the present invention is realized by knitting two extra-fine dry-spun spandex bare yarns and another knitting material yarn threaded in a jacquard guide.
1. Another yarn delivery unit is installed in front of the jacquard yarn delivery unit in addition to the original yarn delivery unit of the RSJ warp knitting machine (each from front and back as in the conventional design in the art). Do not insert into the guide holes of one jacquard bar), which makes it easy to insert the elastic thread into the holes of the jacquard guide bar from the front side. The most striking advantage of such threading is that the situation where elastic threads are prone to sticking and knotting during the activation process is fully taken into account, thereby helping workers to deal with thread defects as much as possible. It is a point to do.
2. A new stand-alone yarn running system suitable for ultrafine dry spinning spandex nudes has been added, which can help prevent adhesion or knots when large quantities of ultrafine elastic dry spinning spandex yarn are fed. ..
3. Through a specific warping control process similar to Embodiment 1, the ultrafine dry-spun spandex nudes are warped at a uniform draft ratio, resulting in a warping beam package suitable for use in machines. can get.
4. Two yarns (ie, ultrafine dry spun spandex yarn and another knitting material yarn) are simultaneously inserted, superimposed and knitted into the holes of the jacquard guide.

In the knitting method of the second embodiment of the present invention, the bare child of the ultrafine dry-spun spandex is spundex by adding a sending device set to the front part of the RSJ warp knitting machine based on the characteristics of the RSJ warp knitting machine and the actual production needs. By adding a stand-alone thread running system suitable for the thread, it is possible to feed linearly into the hole of the guide without the influence of the inlay of the original thread.

Two ultra-fine dry-spun spandex bare yarns and conventional jacquard yarns are threaded through the holes in the jacquard guide bar. After knitting, the legs or underwraps of the other yarns are locked tightly by the strong pull of the bare yarn of the ultra-fine dry spinning spandex so that fraying does not easily occur from any direction and the fabric has free-cut characteristics. Will have.

As shown in FIG. 1, one of yarns A and B is a bare yarn of ultrafine dry spinning spandex, which has good elasticity and multiple stitches to aid in resistance to fraying. They can be in close contact and fixation together at intersections (eg, numerical positions during stitching in Figure 1).

Based on the characteristics of the RSJ warp knitting machine, a complete set of yarn travel paths is optimally styled for the bare yarn of ultra-fine dry-spun spandex to ensure the knitting of two bare yarns of ultra-fine dry-spun spandex. Designed. That is, the delivery of elastic yarns (bare yarns of ultrafine dry spinning spandex) is carried out from the upper front part of the machine without passing through the bending of the guide bar at a large angle, and these yarns are carried out in the yarn running path. Wherever possible to avoid additional friction, it is almost threaded through the hole in the jacquard guide bar located at the shortest straight distance, while this does not adversely affect the original conventional thread run. .. On the other hand, the bare yarn of ultrafine dry spun spandex has a complete set of stand-alone yarn running systems, allowing the treatment of broken yarns to be completely unaffected by the original conventional material yarns.

Because spandex and non-spandex raw materials have different drafts in the warping and knitting processes, and because there are no additional yarn delivery devices in conventional RSJ warp knitting machines, the stand-alone yarn delivery path is spandex knitting. It shall be designed so that two spandex yarn feeds are threaded to fit the.

FIG. 2 schematically shows an active thread feeding device according to the present application. Reference numeral 1 indicates a warping beam, reference numeral 2 indicates an active delivery unit, reference numeral 3 indicates a drive chain, and reference numeral 4 indicates a pillar. Pillar 4 is newly added to fix components such as a delivery unit and a thread diffusion device. In addition to the original yarn delivery unit on the RSJ stand, the active yarn delivery unit 2 is such that the bare spandex yarn on the warp beam is fed into the guide of the knitting bar according to a certain delivery amount. Newly added to drive the outgoing warping beam 1.

The material of the ultrafine dry spinning spandex warped on the warping beam 1 is finer and has lower strength. Both overly long and meandering yarn running paths cause problems with yarn breakage or yarn running position in the knitting of ultrafine dry spinning spandex. At the time of knitting, it is necessary to adjust the yarn outlet position of the ultrafine dry-spun spandex yarn on the warp beam 1, and in the present embodiment, the yarn outlet position on the warp beam is below the warp beam. .. The way the yarn comes out can be changed by changing the rotation direction of the delivery unit 2. Extra-fine dry-spun spandex yarns and knitting material yarns are threaded through the same bar needle hole so that accurate laying can be performed during knitting. The angle between the spun spandex yarn and the knitting material yarn is as small as possible, preferably substantially parallel. Even if a yarn diffusing bar is installed in the machine stand to allow the ultrafine dry spun spandex yarn to advance through this diffusing bar and thus to achieve the required angle between the ultrafine dry spun spandex yarn and the knitting material yarn. Good. If the angle from the outlet position of the ultrafine dry spun spandex yarn from the warping beam to the yarn diffusion bar can be excessively large, and that large angle can make the ultrafine dry spun spandex yarn run unsmooth, the yarn diffuses. A separate thread diffusing bar is added between the bar and the warping beam to solve this problem.

The warping of spandex nudes used in Embodiment 2 has a much larger package of spandex cones for bare yarns, does not require pre-processing, and has a sufficient material supply, which is affected by the shipping period. It is advantageous because it does not suffer from. Therefore, the comprehensive cost is more advantageous than that of Embodiment 1.

The above are two approaches to knitting fabrics with free-cut properties with RSJ warp knitting machines, both of which require a specific warping control system for the warping beam. The RSJ warp knitting machine will be improved in the second approach. A particular ground net may be designed and implemented by an RSJ warp knitting machine to knit fabrics with free-cut properties, for which any modification in the art is made in accordance with the requirements. Also, it is not listed in this application.

The above is merely a preferred embodiment of the present application and is not intended to limit the present invention. Any modifications, equivalents, substitutions, improvements, etc. made within the spirit and principles of the present application may be included within the scope of protection of the present invention.

1 Warping beam
2 Active sending unit
3 drive chain
4 pillars

Claims (5)

A method for manufacturing free-cut fabrics based on the RSJ warp knitting machine.
A step of preparing one or more yarns, wherein the yarn comprises a dry-spun spandex wrap yarn or a microdry-spun spandex bare yarn.
The dry-spun spandex wrap or the ultra-fine dry so that the dry-spun spandex wrap or the ultra-fine dry-spun spandex bare yarn is individually warped on a warping beam with a constant draft ratio. A step of performing warping on bare yarn of spun spandex, where the weighing method is used to select cones of the same weight for warping, with a weight deviation within 3%. Controlled, upward tension deviation and downward tension deviation are controlled within 1 cN in the warping process,
Send the dry-spun spandex wrap yarn into the hole in the jacquard guide bar of the RSJ warp knitting machine, or insert the extra-fine dry-spun spandex bare yarn and another knitting material yarn into the hole in the jacquard guide bar of the RSJ warp knitting machine. Steps to form a geostructure with a mixture of chain knitting, tricot knitting, and fleece cord knitting by threading
A method characterized by including. By installing another delivery unit in front of the original delivery unit of the RSJ warp knitting machine, the bare yarn of the ultrafine dry spinning spandex is inserted from the front side of the jacquard guide bar into the hole of the jacquard guide bar. The method according to claim 1, wherein the step is performed. The method according to claim 1 or 2, further comprising the step of preparing a stand-alone yarn running system for bare yarn of the ultrafine dry spun spandex. It further comprises a step of controlling the outlet position of the bare yarn of the ultrafine dry spinning spandex from the warping beam by changing the rotation direction of the other delivery unit additionally prepared. The method according to any one of claims 1 to 3. By installing the yarn diffusion bar for the bare yarn of the ultrafine dry spinning spandex, the bare yarn of the ultrafine dry spinning spandex and the other knitting material yarn are placed in the holes of the jacquard guide bar at substantially parallel angles. The method according to any one of claims 1 to 4, wherein the method includes a step of passing two threads.

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