KR20080064740A - Method for manufacturing a non-run elastic fabric - Google Patents

Abstract

A manufacturing method of a non-run elastic fabric is provided to have the reduced mass per unit surface and the uniform elasticity toward all directions. A warp knitting machine has two thread guide bars and needle bars. A hard thread(2) is arranged to one of thread guide bars previously and an elastic thread(3) is arranged to the other of thread guide bars previously. The hard thread and the elastic thread are arranged by the same phase according to the web with the same period of 4 stitches. Three continuous stitches are obtained at three different continuous needles. The hard thread and the elastic thread are arranged in parallel to each other. The needles are arranged at a needle bar previously by the density of the number of 32-44 per inch. The web has an open type stitch and a close type stitch alternately arranged with each other.

Description

METHOD FOR MANUFACTURING A NON-RUN ELASTIC FABRIC}

The present invention relates to a method of manufacturing a non-run elastic fabric in a warp knitting machine having two thread guide bars and a needle bar, which method pre-rigids a rigid thread on one of the thread guide bars. The other yarn guide bar consists of pre-arranged elastic yarns.

As is known, fabrics are made from a plurality of yarns arranged according to a particular periodic geometry that allows for the interconnection of the yarns and the formation of squelches.

The properties of the fabric are thus determined by the geometry of the weave, the type of yarn and the dimensions of the individual squelch with the end.

In particular, so-called undulation-free elastic fabrics are made of a plurality of woven yarns (called warps) deployed in a single direction.

The fabric is made of many different kinds of yarns, in particular substantially rigid yarns and substantially elastic yarns.

Unfolded elastic fabrics are used in many different applications, in particular in garments or fabrics such as swimwear, sporting clothing, underwear and the like.

Traditional fabrics of this kind have a so-called "charmeuse" obtained through the weave of elastic yarns and rigid yarns, for example, according to a combination of tricot and double tricot weave, which gives the fabric an elastic and high quality appearance. .

The fabrics are produced industrially with knitting machines (having warp / weft looms) designed for specific purposes. The knitting machine has a system for the conveyance and movement of the yarn, which is inserted into an eyelet of the porous element provided for a specific purpose called a "weft taker" and transverse to the direction of the yarn. One or more needle rows arranged as

When the machine is in operation, the weft taker and needle are in reciprocating motion and the yarn moves continuously. In particular, the thread has a continuous vertical downward movement, and the weft taker, which keeps the thread moving, performs longitudinal and transverse reciprocating movements, and the needle installed under the weft taker interacts with the thread moved by the weft taker. Will be

The fabric is formed by the interaction of the threads and the path of the thread around the needle.

Thus, it is possible to change the properties of the fabric by changing the motion parameters of the elements constituting the machine, in particular by setting the longitudinal motion of the weft taker and also keeping the periodic movement of the needle and the continuous movement of the yarn constant.

The known art has some significant drawbacks.

In particular, it has been found that it is not possible to produce very fine and light free-elastic elastic fabrics with sufficient resistance to abrasion and various stresses.

As a result of this, several disadvantages appear, which is due in particular to the need for squelches of relatively large dimensions.

For example, swimwear made of known fabrics do not constitute sufficient barriers to sand that can penetrate between squelch and pass through the fabric. In addition, these fabrics are not resistant to chemicals, especially chlorine compounds, which are often used in swimming pools and tap water.

The fabric also has a long drying time because of its large thickness.

Finally, known elastic fabrics are non-uniform in width and length in elasticity and also less "pilling", i.e., less resistant to physical processes resulting in the formation of irregular and small fiber balls on the surface of the fabric.

The technical problem of the present invention in view of the above situation is to provide an elastic fabric without a pull-up that can substantially overcome the above-mentioned disadvantages.

Among the above technical problems, an important object of the present invention is to produce an elastic fabric having a high degree of resistance to chemicals and mechanical stress.

Another important object of the present invention is to obtain an undulation-free elastic fabric with high fineness.

It is a further object of the present invention to obtain an unwound elastic fabric with reduced mass per unit surface.

The last important object of the present invention is to obtain a fabric having a uniform elasticity in all directions.

The above technical problem and object are achieved by a non-run elastic fabric manufactured in a warp knitting machine having two thread guide bars and a needle bar, and pre-rigid rigid yarn in one of the thread guide bars. Pre-arrange elastic yarns on different thread guide bars, and arrange the rigid yarns and elastic yarns in the same phase according to the weaves having the same periodicity of four squelches, and three consecutive squelch Obtained in successive needles.

The fabrication method of the present invention is a method of producing an unwound elastic fabric, which has high resistance to chemicals and mechanical stress, high fineness, reduced mass per unit surface, and a uniform elasticity in all directions. Elastic fabric without this can be obtained.

Other advantages and features of the present invention will become more fully apparent from the following detailed description of the preferred embodiments of the present invention with reference to the accompanying drawings.

 In the figure, the entire fabric according to the invention is marked with "1".

The fabric is made of warp knitting machines having two or more rows of weft takers.

The warp knitting machine is of the known kind, for example the trade name Copcentra produced by LIBA Maschinenfabrik GmbH, Germany.

As mentioned above, the warp knitting machine suitably includes a system for transferring and moving the yarn in the beam, which thread is inserted into two bars of the porous weft taker and delivered to the needle bar.

In particular, two seal guide bars are provided one each at the front and the rear, and can linearly reciprocate in the longitudinal and transverse directions.

In addition, one same kind of yarn may be delivered to each thread guide bar, and two different kinds of yarn may be selectively delivered to two different bars.

The thread then falls away from the position corresponding to the needle, and around the needle the thread forms an open or closed squelch.

When the warp knitting machine is operated, the thread is woven by the interaction and phasing of the constant vertical motion of the yarn given by the system of longitudinal and transverse reciprocation of the thread guide bar and the system of vertical reciprocation of the needle. The fabric is formed.

In particular, the movement of the thread feed system, the reciprocating motion of the needle and the longitudinal reciprocating motion of the thread guide bar always remain substantially constant irrespective of the type of weave, and the transverse reciprocating motion of the thread guide bar depends on the type of fabric Adjusted. In fact, the movement allows the thread to pass around one needle or the other and form an open or closed squelch.

The fabric 1 is made of two different kinds of yarns: substantially rigid yarns 2 and substantially elastic yarns 3.

A yarn with an elongation of less than 20% of its total length is said to have "substantial stiffness" and a yarn with an elongation of at least 80% of its total length has a "substantial elasticity".

The rigid chamber 2 can be made of a known kind of material, for example a polyamide multifilament yarn. Alternatively, the rigid yarn may be made of polyester, polypropylene or other material.

The rigid chamber suitably has a titer of 22 to 60 dTex, more suitably 22 to 44 dTex. As is known, the titer representing the linear density of the yarn is measured in dTex, which is expressed as the weight in grams of 10 km yarn (1 dTex = 0.1 g / km).

The elastic chamber 3 is made of a known kind of material, in particular made of an elastomeric polymer, for example polyurethane. Moreover, this elastic chamber suitably has a titer of 22 to 60 dTex, more preferably 33 to 44 dTex.

In addition, the ratio of the linear density (indicated by dTex) of the rigid chamber 2 and the elastic chamber 3 is preferably 0.5 to 0.9.

In order to make the fabric 1, the threads 2, 3 are arranged in the machine described above.

In particular, the rigid chamber 2 is arranged in an eyelet of the conveying system and the front thread guide bar, and the rigid chamber 2 is placed on each weft taker of the front bar.

Likewise, the elastic chamber 3 is arranged in the loop of the conveying system and the rear thread guide bar, and the elastic chamber 3 is placed on each weft taker of the rear bar.

Alternatively, it is also possible to change the position of the yarn so that the elastic chamber 3 is arranged in the front bar and the rigid chamber 2 in the rear bar.

The yarns 2, 3 are arranged according to a weave determined by the reciprocating motion of the thread guide bar.

For example, in the accompanying drawings, two preferred ways for producing the fabric 1 are shown.

The figure schematically shows the basic structure which is repeated periodically to form the fabric 1.

Also shown in the figure are a number of points, each representing a needle in its temporary position. The needles are arranged in horizontal rows (hereinafter "rank") and vertical rows (hereinafter "line"). The line is actually determined by the periodic movement of the thread and the needle itself, and the rank is determined by the horizontal position of the needle itself, so that the line of needles represents the periodic position of one and the same needle, each rank representing a number of different needles. Indicates.

In the empty spaces between the lines, a natural number of 0 to 4 is displayed, which indicates the position where the weft takers arrange the yarns.

In particular, the weft taker can be arranged in a circle around the needle to form a closed squelch or an open squelch along a non-closed path.

The woven fabric 1 is obtained from a base portion comprising a rigid yarn 2 (indicated by a solid line) and an elastic yarn 3 (indicated by a dashed line).

The two threads 2, 3 of the basic part are arranged in the same phase, ie the two threads in each rank are always arranged in the same needle.

In addition, the threads 2, 3 are suitably always arranged in parallel, ie always follow the same path and constitute one same kind of open or closed squelch at the same needle.

Moreover, the two threads 2, 3 are arranged according to the weave having a periodicity of four squelches, in which three consecutive squelches are obtained from different needles. The term "continuous" here means not crossing the needle. The weave is also called the Atlas weave.

The weave may comprise open or closed squelches, in particular the number of closed squelches among the four squelch contemplated may vary from 0 to 4, with the remaining squelch being open.

In the weaves shown in FIGS. 1-3, the closed squelch alternates with the open squelch, in particular the closed squelch is arranged at two of the three needles.

The weave is defined by the movement of the two front and rear thread guide bars, the movements occurring in parallel so that the yarns (2, 3) are 1 to 0 in the first rank, 1 to 2 in the second rank, and 2 in the third rank. In the -3 and the fourth ranks, they can be arranged in parallel at positions corresponding to the spaces of 2 to 1.

In the weaves shown in Figures 4-6, the closed squelch alternates with the open squelch, in particular the closed squelch is arranged in the central needle.

The weave is parallel to the front and rear thread guide bars at positions corresponding to 0-1 in the first rank, 2-1 in the second rank, 3-2 in the third rank, and 1-2 in the fourth rank. It is decided to exercise.

The weave is also made on machines where the density of needles per inch (= 2.54 cm) is 32-44 and the density of weft taker per inch is the same. In particular, the needle density per inch is 40-44.

The density of the needle and weft taker will determine the size of the squelch and the number of squelch of the fabric and the surface density of the squelch. Therefore, the density of the needle per unit of measurement is a useful factor for quickly identifying the basic properties of the fabric.

The method can be produced in other types of knitting machines as long as the properties of the base part, the properties of the yarn constituting the base part, and the properties of the surface density of the squelch remain the same.

The present invention has an important advantage. In particular, the use of two yarns 2, 3 arranged in the same phase or in parallel means that the elastic yarn 3 does not operate in the opposite phase and does not cross the rigid chamber 2 itself. In this way, the mechanical friction in the fabric 1 can be significantly reduced and the durability of the two yarns, in particular the elastic yarn 3, can be made longer.

It has also been found that mechanical friction present in elastic fabrics of a known kind rapidly deteriorates known fabrics with the chemical corrosion action of certain substances present in the water and in particular sodium hypochlorite present in swimming pools and tap water.

In contrast, the present fabric 1 can maintain high resistance even in the presence of sodium hypochlorite because mechanical abrasion is practically absent.

Another important advantage also lies in the arrangement of the threads 2, 3. In fact, the base of the weave has a number of vertical squelches that are very similar to the number of horizontal squelches, and thus have a substantially square formation.

Thanks to this property, it is possible to make fabrics with very fine yarns as mentioned above and above all with a large number of squelches per unit surface.

Another advantage is that it is possible to choose seals 2, 3, which have the specified dimensions and properties and are also made of the specified material.

This property makes it possible to produce very fine and light fabrics 1.

In particular, a fabric having a mass per unit area of 160 g / m ² , 0.25 to 0.80 mm thick, about 50% smaller than the thickness of a traditional Charmeuse, and a fabric having durability beyond that of a known kind of unwound elastic fabric (1) can be made.

In addition, the fabric 1 has good coverage and resistance to sand due to its fineness.

In fact, the fineness described for the squelch forming the fabric 1 is intended to prevent sand or other particles from penetrating or passing through the squelch of the fabric.

In particular, a so-called "sand test" was carried out on the swimsuit made of the fabric (1). In this test, the swimsuit is used heavily on the surface of the sand to measure the amount of sand contained in the swimsuit. The test results are given as numerical scale values of 1 to 5. The fabric (1) always obtained the maximum score that could be given after the evaluation.

Moreover, due to the fineness itself, the fabric 1 can be dried quickly, and the feel is also good because the fabric 1 is felt as a second skin rather than a foreign body.

In addition, the fabric 1 has a high dissipation property, and thus can dissipate heat optimally.

The fabric 1 also has a uniform elasticity in all directions due to its special weave.

Finally, it has been found that the present fabric 1 has a very high resistance to peeling and curling, that is, the tendency to round and dry. In fact, in a suitable test of these two properties, this fabric (1) always showed excellent results.

1 shows the basic structure for producing the fabric of the first example according to the invention.

FIG. 2 shows the basic structure for the arrangement of the first yarn designed for producing the fabric shown in FIG. 1.

FIG. 3 shows the basic structure of the arrangement of the second yarn designed for producing the two fabrics shown in FIG. 1.

4 shows the basic structure for producing the second example fabric according to the invention.

FIG. 5 shows the basic structure for the arrangement of the first yarn designed for producing the fabric shown in FIG. 4.

FIG. 6 shows the basic structure of the arrangement of the second yarn designed for producing the fabric shown in FIG. 4.

 * Description of the symbols for the main parts of the drawings *

1: fabric 2: rigid yarn 3: elastic yarn

Claims (14)

 A method of manufacturing a non-run elastic fabric in a warp knitting machine having two thread guide bars and a needle bar, wherein the rigid thread 2 is pre-arranged in one of the thread guide bars and the other thread In the guide bar, a method for producing an unwrinkled elastic fabric comprising prearranged elastic chambers 3, The rigid yarn 2 and the elastic yarn 3 are arranged in the same phase according to the weaves having the same periodicity of four squelches, wherein three consecutive squelches are obtained from three different continuous needles. Method of producing an elastic fabric without any loosening. 2. Method according to claim 1, characterized in that the rigid chamber (2) and the elastic chamber (3) are arranged parallel to each other. 3. The needle of claim 1 or 2 wherein said needles are at a density of 32 to 44 per inch. Prearranged in said needle bar. 4. The method of claim 3, wherein the needle is prearranged in the needle bar at a density of 40 to 44 per inch. The method of claim 1 wherein a weave is provided having a closed squelch alternate with an open squelch. The method according to claim 1, wherein the rigid chamber (2) has a linear density of 22 to 44 dTex. The method according to claim 1, wherein the elastic chamber (3) has a linear density of 33 to 44 dTex. The method according to claim 1, wherein the rigid chamber (2) and the elastic chamber (3) have a linear density ratio of 0.5 to 0.9. Method according to claim 1, characterized in that one of the thread guide bars is arranged in the front, the other in the rear, and the rigid chamber (2) is arranged in the front bar. A fabric obtained from a base portion comprising a rigid yarn 2 and an elastic yarn 3 arranged in phase with each other, The fabric characterized in that the rigid yarn (3) and the elastic yarn (3) are also arranged in accordance with an atlas weave having a periodicity of four squelches. 11. Fabric according to claim 10, characterized in that the rigid yarn (2) and the elastic yarn (3) are arranged parallel to each other. 12. The fabric according to claim 10 or 11, wherein the rigid yarn (2) has a linear density of 22 to 44 dTex. 13. The fabric according to one or more of claims 10 to 12, wherein the elastic yarn (3) has a linear density of 33 to 44 dTex. 14. Fabric according to one or more of claims 10 to 13, characterized in that the rigid yarn (2) and the elastic yarn (3) have a linear density ratio of 0.5 to 0.9.

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