Method of production of multi-layer fabric. RU patent 2504605.

FIELD: textiles, paper.

SUBSTANCE: method of production of multi-layer fabric lies in successive formation of one or more sheds, with simultaneous or sequential laying in them of weft yarns, beat of weft yarns to the edge of the fabric, retraction of the fabric and release of the warp. In order to reduce the load on the warp at beating, to improve dimensional stability of the fabric and the degree of filling it with yarns, and to reduce the fabric shrinkage in width, the beating of weft yarns is carried out with the open shed and the reed is retained at the fabric edge up to the subsequent laying of the weft threads. In order to stabilise the tension of the warp threads in the fabric formation cycle, the forced compensation of change in the length of the warp yarns is carried out in the shed independently for each branch of the warp and consistently with the position of the heald frame. When developing the layered-backing fabrics to reduce abrasion of warp yarns and simplify the system of management of retraction of the fabric, forming individual layers and their pulling to the other layers is carried out by changing the stroke of the movable reed, and the direction of pulling is set by tilting the movable reed when it moves to the edge of the fabric in the direction of the layer to which the newly formed layer is pulled.

EFFECT: invention enables to reduce the dynamic loads on the warp threads during beating and shedding, and to reduce the fabric shrinkage in the width.

3 cl, 4 dwg

The invention relates to the textile industry, particularly, to the weaving production of serial cycle of forming fabric, and is intended primarily for the production of multilayer and three-dimensional tissue from high-modulus threads, but could be used for production of single-layer fabrics for various purposes.

A method for producing multilayer fabric [1], which consists in the sequential formation of a framework frame layers of fabric and filling the basis of fragments periodically to frame segments of their main thread when you return fabric towards the pharynx and between the threads filling the basics.

Also known way to obtain a multilayer fabric [2] with an increased number of frame layers, where the filling fragments fasten to each other threads frame foundations.

Also known method of manufacturing of hollow multilayer tissues on the loom [3]including warp threads on the loom with the installation of the filling line of formation of multilayer hollow fabric, including a bandage on the upper and lower layered paintings threads duck, passing from one layer of the top of the canvas in the same layer of paintings and Vice versa, when in the reed produces a decrease in the number of warp in in the marginal areas of the paintings, a filling line of the machine set speed the transition weft threads from one canvas to another twist their alternately with warp layers beneath his canvases and alternately with warp each layer the other paintings from the original design weave in the paintings. In addition, when warp, involved in the formation of more than one element weave, in each placed between the warp threads, participating in the formation of only one element weave in each .

Also known method of manufacturing multilayer fabric [4], which is implemented through the weave filling threads and the two main systems, one of which is to create folds with the top and bottom flaps, stipulated by the second main system at the bottom with clamping weft threads to use a device that is mandatory raises the fold with the lower and the upper slips in a vertical position. When this fold received weave filling threads and a main thread, simultaneously with the raise in vertical position from the previous level flashing to the subsequent level flashing, finally secured in an upright position on the upper folds more mainstream, and as a device to force the rising fold, use individual Navoi-coils with individual tension main thread tension regulate the location and quantity of cargo brackets.

In all known ways of formation of multilayer tissues surf weft threads is carried out by short-term exposure rolling hips to the edge of the fabric, and the time of the surf is delayed in relation to the time , thus consolidating the weft threads crossed warp. The disadvantage of these methods is high tension basis at the time of the surf required to hold the weft threads in the fabric, which increases with and elastic modulus Flexural rigidity, main and weft threads and leads to increased strain weft threads and, consequently, shrinking of the fabric in width. Most of the thickness of a multilayer fabric excludes the application of the edge expander, reducing shrinkage tissue. The result is increased friction edging warp threads about teeth Byrd, resulting in wear of the teeth Byrd and abrasion main thread, which becomes critical for fragile modular threads (silica, basalt, quartz, carbon).

The objectives of the claimed invention is to reduce dynamic loads on the main thread in the surf and and reduce shrinkage fabric width.

Reducing the load on the main thread when the surf is ensured by the fact that surf carry out open Byrd to with open mouth and keep them weft threads on the edge of the fabric during the entire cycle of formation of the subsequent and paving the duck, then the bar is removed from the basics, move towards the pharynx, introducing basis, with a simultaneous inclination to facilitate the entry and move to the edge of the fabric with simultaneous restoration of the angle of inclination of the working edges Byrd against the fabric, which are necessary to ensure the assigned structure fabrics. Thus, reed, long time is in contact with the tissue, prevents it from shrinking width.

Reduction of additional tension of the main threads of the is achieved through the warp through individual or group, depending on how , controlled compensators lengthening, opting for a surplus of a thread at the closing of the throat and releasing a thread in the shed when you open it.

The invention is illustrated schemes, which are not covered and, moreover, do not limit the whole amount of the claims of this technical solution, but only to illustrate the materials of the particular case of implementation of the proposed method:

Figure 1 illustrates the flat weaving machine with front surf, implementing the basic processes of the proposed method, in the original position after the laying of the weft threads.

Figure 2 summarizes the major provisions of a rolling stock of open Byrd in the process of the surf.

Figure 3 illustrates the process of the subsequent .

Figure 4 presented the state of the elements of the machine after the installation of the final for fragment of tissue fillings.

To obtain a multilayer fabric due to the difference in threads in various systems of the basics you need at least two navoev, in addition to or instead of which can be installed rack with and/or needle-coil.

The technological scheme (figure 1) power system basis presents the minimum number of elements - 1 and 2, with which the warp through straightening rolls, 3, among which there can be and shafts rocky systems (not shown in the figure), is carried out through the eyes compensators 4, having the ability to enforce the controlled movement in a direction perpendicular to the plane of the basics. Next, skirting support 5 shafts, warp between the teeth of a stationary separation Byrd 6, through the eyes system 7, consisting of heald frames and/or individual (not shown in the figure) and between the teeth of a stationary guide Byrd 8 spend in a zone of formation of tissue, where the throat, educated warp, simultaneously or alternately to pave the weft threads 9, who then beat the teeth of the open rolling Byrd 10 to the edge of the fabric 11, which is periodically withdrawn from a zone of formation of the mechanism of dissipation of tissue (not shown on the scheme).

Mobile reed 10 keep in contact with cloth 11 until the end of the strip subsequent filling threads 9, after which it is removed from the tissue (up to fig.2), move in the direction of the sending Byrd (left fig.2) and turn so that the back part of his teeth was located in parallel guide Byrd 8 (right to fig.2). At that provide the coincidence of the planes teeth directing and open-Berd, which allows rolling Byrd walk freely in the gaps between the main thread in the sinking teeth rolling Byrd in the basis (down fig.2). The amount of penetration ask sufficient for subsequent transfer all laid weft threads to the edge of the fabric (right figure 2 g). While moving rolling Byrd it turns so that the edges of the teeth were parallel to the plane of the location of the weft threads in the generated stretch fabric (to the left in figure 2 g). In the manufacture of especially thick fabrics and fabrics with high reliefs can be applied two movable Byrd, who come over and under the cloth and perform the above operations surf weft threads synchronously both or one of them, leaving the second fixed in contact with the edge of the fabric.

Vacation basis and diversion of tissues takes place during operations surf primary for each longitudinal slice fabric weft threads in the directions indicated by the arrows in figure 2. Subsequent weft threads of the current fragment beat without drainage of tissues. At manufacturing of layered-frame tissue formation of separate layers produced by reducing stroke rolling Byrd without drainage of tissues, linking them with other layers is performed by increase of a course Byrd while on vacation appropriate framework and direction vertical set by corresponding rotation of rolling Byrd when moved to the edge of the fabric.

Consolidation weft threads in the fabric produced by the subsequent according to the picture weave when an individual or group movement (diagrams shows a group movement). In this case, the excessive length basis, formed at the closing of the throat, choose diversion warp from the plane of the support shaft 5 using forcibly moved compensators 4 (up to fig.3), and when opening the throat lack length basis compensate by her leave the compensator down on fig.3). Way of management compensation length basis and method of management match: when management of the key threads in use their own compensation of their length, group - group compensation. To control compensators, use the following rule: the sum of the length basis in the area of compensation and in the area of the throat remains constant during the whole process of weaving.

After the end of each produce another gasket duck (figure 4), then repeat all of the above transactions, except for the drainage of tissues, which is carried out once for the whole cycle of formation of a single fragment length tissue, i.e. when the surf of the first in this segment, the weft threads.

Thus, the claimed method allows to obtain the same loom wide range of multilayer tissues increased filling at lower pressures on the main thread and low-shrinkage fabric width.

List of information sources:

1. The method of obtaining a multilayer fabric. As USSR №719179 from 20.03.1978, MKI D03d 23/00 and D03d 11/00.

2. Multilayer fabric and method of its manufacture. As USSR №1176648 from 21.07.1983, MKI D03d 11/00.

3. A method of manufacturing of multilayer hollow tissues on the loom. As USSR №1619759 from 20.10.1999, MKI D03d 11/00.

4. Multilayer fabric and method of its manufacture. Patent of Russian Federation №2164568 from 27.03.2001, MKI D03d 11/02.

1. The method of obtaining a multilayer fabric, which consists in the sequential formation of one or more , simultaneous or sequential laying them in threading the threads, surf weft threads to the edge of the fabric, the challenge of the fabric and vacation basis, wherein, with the aim of reducing the pressures on the basis of the surf, and increase tissue and degree of occupancy of its threads and reducing shrinkage fabric width, surf weft threads carried out at the open mouth and hold the bar at the edge of the fabric up to the follow-up pads weft threads.

2. The method according to claim 1, characterized in that, to stabilize the tension of the main threads in the loop forming fabric, producing a forced compensation for the change of the length of the main threads in the shed independently for each branch basis and coordinated with the position of the remise.

3. The method according to claim 1, characterized in that, while producing layered-frame fabrics with the aim of reduction of abrasion of the main thread and the simplification of the system of management of the tap of tissue formation of the individual layers and their draw to the other segments of produce due to change in the course of rolling Byrd, and the direction draw asked by an inclination of the rolling Byrd when moved to the edge of the fabric in the direction of the layer to which the newly attract formed layer.