SU1757595A1 - Method of card web jointing - Google Patents

Abstract

Use: connection of needle-punched nonwoven fabrics. SUMMARY OF THE INVENTION 1 The edges of the joined webs are cut obliquely to the surface of the webs, they are placed with overlapping inclined surfaces, between which a polymeric film is laid. After that, the webs are ground along the edges with a zigzag seam with a seam width not less than the width of the cut in the plane of the web. 3 il.

Description

The invention relates to the manufacture of textiles, and more specifically, to the combination of thickened textiles and blanks with each other. For example, this method can be used when connecting needle-punched non-woven cloths and fiber blanks together.

A known method of joining the webs consists in cutting the edges of the webs together obliquely to the surface of the web, placing them overlap in inclined cuts and grinding them with a filament stitch.

The known method of joining mainly relates to shoe materials, namely, it is used when joining the details of berets in the fifth part of shoes. The parts are then butt-connected with the obligatory use of a rear outer belt. The operation of lowering the edges, i.e. their thinning in this case is absent. For joining the details of the upper of the shoe, adjusting seams with single or double thread stitches are widely used. However, the use of a Zigzag seam when joining overlapped shoe details is usually not allowed. The elasticity of the stitched seams in the workpiece shoe parts is achieved due to the initial flexibility of the leather raw material.

The known method does not take into account the specific features of needle-punched nonwoven webs and blanks, does not provide the necessary level of combination of the parameters of elasticity and strength of the resulting joint, which makes it difficult to use it to grind such materials.

The aim of the invention is to provide the elasticity of the connecting unit when joining needle-punching fabrics and to simplify the grinding process.

This goal is achieved by the fact that when the butt joint of the cut edges of the parts to be wiped together, a polymer film is laid between the inclined sections, and the grinding process is carried out with a zigzag seam with a seam width not less than the section width in the plane of the web.

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Thus, the peculiarity of the proposed method is the preliminary execution of an oblique cut at the joined edges of parts with increased thickness and location in the cut plane of a thin polymer film. In this case, the cut angles in the parts to be joined may differ somewhat from each other, and the material itself, for example, the details of needle-punched nonwoven webs and blanks, may undergo a certain deformation and compression to give the desired shape.

Another feature is the use of a zigzag-type seam and the choice of its width associated with the width of the cut in the plane of the web. To ensure durability, the cut edges overlap each other, forming a butt joint, and are joined together with a zigzag type suture. At the same time, the thickness of the web in the area of the joint should not significantly exceed the initial thickness of the web, which is ensured by cutting the cross section and with some help by needling the fiber during the stitching and allows the joint rigidity not to increase, i.e. maintain its elasticity. With a large sm tii, i.e. decreasing the original

thickness, joint stiffness can be further reduced without reducing strength, such as tensile strength. Making a zigzag seam is made at a width not less than the width of the cut in the plane of the web, which eliminates the free edges of the edges and increases the strength of the joint. In this case, the polymer film performs the function of not only a reinforcing element, which is known, for example, when it is used in collars and cuffs of men's shirts, but also as a component that promotes the formation of a connecting seam during stitching and smth, as well as an element that improves elasticity bending joints.

Figure 1 shows the formed connecting seam, General view; Fig. 2 shows the arrangement of the rimmed edge edges and the connecting gasket prior to the connection of the needle-punching webs, general view; FIG. 3 shows a variant of making clothes (overalls) using the proposed joint seam.

The method is implemented as follows.

Two pieces of needle-punched cloth (parts) 1 and 2, respectively, with connected edge edges 3 and 4 are pre-treated by an inclined cut with separation of cut parts 5. Next, a connecting gasket 6 of a polymeric film is placed between the cut connecting surfaces of parts 1 and 2, for example made of polyethylene (figure 2). After that, the joined edges and the surfaces are laid on each other and sewn with a 7 Zigzag thread seam. It should be noted that the angles of cut in parts 1 and 2 may differ somewhat from each other — in total, 80-120 °. Their inconsistency is then eliminated by compressing the connected parts in the area of the seam during its execution. The width of the seam should be at least the width of the cut (Fig. 1), i.e., reach or go beyond the joined edges 3 and 4 (which eliminates the separation of the edges). Excessing is possible and appropriate in a number of cases, because expanding the weld area increases its strength, while the gasket forms a Z-shape and additionally contributes to increasing the strength of the joint.

The method of connection allows the manufacture of clothing, for example, protective clothing for protection against contaminants, from needle-punched material with improved sanitary and hygienic and strength characteristics (FIG. 3).

Claims (1)

Claims method of joining, which consists in cutting edges of knitted cloths obliquely to the surface of the cloth, placing them overlap in inclined cuts and grinding them with thread seam, characterized in that in order to ensure the elasticity of the connecting unit when joining needle-felt cloths and simplify the sewing Before grinding the webs, a polymer film is laid between the inclined sections and the grinding process is performed with a zigzag stitch with a seam width equal to or less than the width of the cut. in the plane of the web. J 4 RF ii: i i: i jx g: I iLXlx n iiliii i h I yЈ Editor L. Pavlova .J Compiled by E. Krasnoselsk Techred M. Morgenkorrektor M, Keretsman 1