DE1469425B - Method of joining separate, consecutive polyamide yarns to form a single continuous length of yarn - Google Patents

Description

1 2. .

The invention relates to a method of joining stockings, known in which synthetic linear

that of separate, consecutive polyamide fibers, in particular polyamide fibers, or those thereof

yarn to form a single endless length of yarn. fabric, a heat treatment in

When transferring polyamide yarns in the presence of an agent they are subjected

It is often necessary for woven fabrics to swell two yarn ends 5 somewhat, but not loosen them. When

to connect when breaks occur or when such means is z. B. water or steam

turns the lengths of yarn for its intended purpose.

are not long enough. Usually the ends of the known labor described above are combined, by assigning them in the form of knots, however, are not suitable for tying the subject together or connects. The knotting or io man a teaching regarding the knot-free knotting is unsatisfactory as this will unsplice or join the ends of two to give pleasant and unsightly lumps in the fibers or threads from it.

fabricated fabric forms. It is obvious that there is a technical need

Knots or knots during the transfer for a new and better way of joining

of the yarn can be dissolved into a fabric. Obviously joining or joining of polyamide yarns

Lich a knot-free yarn is of exceptional quality, which eliminates the disadvantages that have arisen up to now.

Length desired and of technical interest. be turned around and avoided.

For this purpose, yarns were hand made or it is therefore an object of the invention to provide

spliced together by machine; however, one method for connecting separate,

like working methods have been quite expensive so far. 20 consecutive polyamide yarns to form

In addition, various adhesives and a single endless length of yarn were also used

Tried chemical binders to no avail. thermochemical. Association through use

Adhesives are characterized by the low level of binding they produce - a special binding agent,

strength limits when they are used in connection- the subject of the invention is therefore a

drive the or joining of two ends of poly-25, which is characterized in that one

amide yarn can be used; the known chemical parallel overlapping end portions of the respective ones

Binders have a tendency to produce yarns with a solution of 40 to 85 weight-

of bonds that remain sticky, coated percent chloral hydrate with aging and then the

discoloration and poor dyeability inherent to coated end parts in contact with each other

have shafts. 3 ° heating to a temperature in the range of 60 to

It is known to produce paper from 150 ° C for a period of 1 to 60 seconds

Polyethylene terephthalate fibers the fibers in which the dries out.

The starting paper formed for them with a solution. The chloral hydrate can thereby lower in water from chloral hydrate on the surface for swelling to saturated aliphatic monohydric alcohols, bring and raise the swollen state again- 35 halogenated alkanols, lower dialkyl ethers, as soon as the desired mutual liability is resolved.

of the fibers in the starting paper is achieved in order to

This way of making papers of greater strength- the ends are overlapped so that the connection

put. is obtained between the ends. A part of

It is also a process for finishing 40 yarns that is chosen as the connection point

Fibers made of synthetic linear high polymers with preferably a small amount of chloral

Amide groups in the chain coated or impregnated by pressing together hydrate solution. The up

known of tangled fiber layers, whereby this can be done in different ways when producing the binding agent,

higher temperature and in the presence of swelling. For example, the means

are subjected to such a high pressure, 45 sprayed onto the yarn, applied by means of a wick,

that the fibers are brushed or padded against each other at the crossing points. Besides that

deform superficially on the sides. The yarns can be separated or combined into the fibers

a so-called surface structure, d. H. an on-medium to be immersed.

roughened surface, so that the concentration of chloraryl hydrate in the contact surfaces interrupted and a better solution depends on many factors, such as the ability to warp is achieved. Bring work method, the proportion of the yarn

Also is a process for surface-absorbed liquid or polymeric binding staple fibers from a thermoplastic structure of the yarn. It has been found that Material containing mats or layers for BiI- methanol or water with a content of about Formation of a strong uniform structure is known to be good 55 40 to 85 percent by weight chloral hydrate where a mat or layer of intertwined or results leads. However, optimal bin-matted, non-plasticized staple fibers, which are given low tensile strength by treating with chloral-tens partially made of thermoplastic material, saturated or almost saturated methanol hydrate standing, being treated with water on the surface or applying water. The temperature of the solution and then the wetted mat material of FIG. 60 when applied to the yarn is not critical. It Subjected to the action of a heated surface, it has been found that room temperature becomes completely whereby at least a part of the thermoplastic is satisfactory, although higher and lower see staple fibers on the surfaces alone softened temperatures can be applied. By doing and converge. The thereby available Endpro area in which the union or connection of the Dukt consists of a non-woven fabric, which is to take place from 65 yarns, it is necessary that the arbitrarily intertwined fibers is formed. Yarn a sufficient amount of the binding agent

There is ultimately a method of taking in order to create a strong knotless connection of the

To effect crease resistance on textile goods, in particular women's yarns. A heating of the binder

load-bearing yarns can be done by means of radiation, convection and heat conduction. Preferably the yarns are supplied with heat through contact with heated surfaces. The time of suspension of heat is, as indicated above, 1 to 60 seconds, the length of time increasing depending on the titer of the yarn, the concentration of chloral hydrate, the particular agent changes to heating and other factors.

During the heating, the yarns to be joined are pressed together under pressure to form a to bring about a better connection. This can be achieved by clicking on opposite sides Sides of the area of the yarns to be joined. However, it is not required that Pressing yarns together on both sides as a good connection can be obtained by making presses the yarn down onto a heated surface. The heating causes the drying of the Solution of chloral hydrate wet yarns. Usually it is not necessary to run the yarn in a subsequent one To clean the operation in order to reduce the solvent after-effects of chloral hydrate or mitigate.

Finally, before any further treatment, which the yarns, the yarns, a considerable amount of time or imposed substantial elongation or elongation, or a disorder or disorder of the yarns brings with it, chilled. The cooling can be achieved by directly applying a coolant to them will. However, it is perfectly satisfactory to have the heated area in equilibrium with it Let it come to room temperature. After cooling, the yarns can undergo the normal processing tensions that occur when they are converted into weave or the like are required.

The invention is explained in more detail below with reference to the drawing.

Fi g. 1 illustrates an embodiment of the application a solution of chloral hydrate on two polyamide strands;

Fig. 2 shows an embodiment of the heating of the solution-carrying polyamide strands, and

F i g. 3 shows an enlarged illustration of polyamide strands connected according to the invention.

An embodiment of the method according to the invention is as follows.

Yarns 10 and 11, between which a knot-free connection is desired, are in contiguous parallel alignment or relationship arranged. When the connection is near the ends of the If yarn is desired, ends 12 and 13 of yarns 10 and 11, respectively, are overlapped as shown in FIG. -

A suitable solution of chloral hydrate 14 is provided in a container 15. A wick material 16, which is carried on a pole 17, extends into the solution. Because of ability of the wick material 16 to draw up a steady or uniform supply of liquid by means of capillary attraction, the solution is applied to the area of connection of the yarns 18 by applying the Bringing yarn into contact with the wick material.

After the area of the yarn has absorbed a sufficient amount of the solution of chloral hydrate has to produce a satisfactory connection, the yarns are out of contact with the wick material and in contact with a heated surface provided by a slot 20 brought. The slot is formed by two walls 21 and 22 which are arranged parallel to one another at a distance from one another and a connecting floor surface 23 delimits. Heat is generated by an electrical heating element inside a holder 24 supplied, wherein the electrical energy of the heating device by means of electrical Lines 25 and 26 connected to a suitable source of electrical energy supply are supplied.

Without pulling the yarns apart, the treated and heated yarn area is cooled to a to effect a strong knot-free bond between the yarns at 27. The free ends 28 and 30 can be removed by means of severing knives (not shown) or similar cutting devices. The cutting off The loose ends is desirable for most purposes, especially when the connected Yarns are then used in the formation of fabric.

In practice, one grabs the yarn near the ends 12 and 13 and brings the Yarns in contact with the wick material 16, which is chloral hydrate dissolved in a solvent contains. After the yarns have absorbed a suitable amount of the solution, the yarns will pulled down onto the heated surface 23 of the slot 20. After a predetermined period of time, which has been determined experimentally to achieve optimal results are the yarns lifted from the surface and without disturbing the connection surface or the connection area 18 chilled. ,

The yarns which can be joined together by the method of operation according to the invention, can range from single thread yarns to a desired number of threads. The yarns can be made from continuous filaments or drawn from staple fibers. For yarns with a high For titers, it may be necessary to "increase the application time and the heating time.

The yarns are made of polyamide material. PoIy- ^ amide is a long-chain, synthetic, polymeric ^ amide, which is an integral part of the main polymer chain contains repeating amide groups, and can be spun into threads in which the structural elements can be oriented in the direction of the axis. Special types of polyamide, from which the threads can be made include Polyhexamethylene adipamide, polymeric poly-ε-caproic acid amide / polyhexamethylene sebacic acid amide as well as polymerization product of pyrrolidone, polyamide of 7-ammoheptanoic acid and polyamide of 11-aminoundecanoic acid and its fiber or thread-forming acids Copolymers.

The invention is explained in more detail below with the aid of examples.

Example!.

A cold-drawn polyhexamethylene adipamide yarn with a tensile strength of 3.1 g each and about half a twist or twist for every 2.54 cm of a Z twist is cut. The yarn contains 204 single threads and has a total denier of 3690 den. The two ends are in adjoining

the parallel arrangement or relationship overlaps. At room temperature a methanol solution is used a content of 65 percent by weight chloral hydrate by means of a wick on part of the yarn of a 1.27 cm wide applied between the overlapped ends. Immediately afterwards, the Yarns are drawn down together over a surface heated to 110 ° C., as shown in FIG. 2, until the Yarns have become essentially dry. The time of connection with the surface is 5 seconds. The yarns are cooled to room temperature. The one obtained from the connected ends Strand has a tensile strength of 1.55 g each, whereby this is 50% < represents the original yarn strength. This strength of the bond is completely surprising, because when the same procedure is repeated using an aqueous solution of Calcium chloride little or no binding has been obtained. This type of bond is also the connection superior that is produced by using resorcinol, with this superiority in the sizes of the original strength, variability in bond strengths, coloring and im Shows lack of discoloration and "stickiness".

Example2

A cold drawn polyhexamethylene adipamide yarn with a tensile strength of 8.9 g each and 0.38 twist per 2.54 cm of a Z twist is cut. The yarn contains 210 single threads and has a total denier of 1260 den. The two ends are overlapped in an adjacent parallel arrangement. At room temperature it becomes a methanol solution with a content of 65 percent by weight chloral hydrate by means of a wicking material to one Part of the yarn applied in a width of about 1.27 cm between the overlapped ends. Right away then the yarns are pulled down together over a surface heated to 110 ° C, as in Fig. 2 until the yarns are essentially dry, the bonding time being compared with that of Surface is 5 seconds. The yarns are cooled to room temperature. The one from the connected The strand obtained at the ends has a tensile strength of 3.6 g each, which is 40% of the original Of yarn strength. It has been found that the bond strengths or strengths are high are more uniform than the splice made by the application of solutions of calcium chloride or Resorcinol have been produced. This means that the connections or splices made according to the invention have been generated show a much smaller deviation than under the splice points, generated by the use of other solvents is present.

Examples

When polymeric ε-aminocaproic acid yarns according to those described in the previous examples When working together, comparable excellent bond strengths are obtained.

A cold drawn e-aminocaproic acid yarn with a manufacturer twist and a tensile strength of 7.7 g each is cut. The yarn contains

ίο 136 single threads and has a total titre of 840 den. The two ends are overlapped in an adjacent parallel arrangement. At room temperature a methanol solution with a content of 70 percent by weight is made by means of a wick material Chloral hydrate on part of the yarns with a width of about 1.27 cm between the overlapped Applied ends. Immediately afterwards, the yarns are put together on a heated surface at 110 ° C, as shown in Fig. 2, pulled down until the yarns are substantially dry, the Connection time with the surface is 5 seconds. The yarns are cooled to room temperature. The strand obtained from the connected or united ends has a tensile strength of 1.9 g each, which corresponds to 25% of the original yarn strength.

It is thus found that the method according to the invention affords several advantages. A New method of making or achieving a bond between polyamide yarns is provided. The process is simple and cheap. The union of the two ends of yarn becomes without Application of a disruptive knot is achieved, making the union or connection strong and lasting is. In addition, fabrics made from yarns have their ends through the process be connected according to the invention, a more pleasing appearance. The dyeability of the chamois is furthermore, it is not adversely affected, and the bonds do not remain tacky and they do not suffer discoloration with aging.

Claims (2)

Patent claims: 1. A method for joining separate, successive polyamide yarns to form a single continuous length of yarn, characterized in that parallel overlapping end parts of the respective yarns are coated with a solution of 40 to 85 percent by weight of chloral hydrate and then the coated end parts are in contact with one another by heating a temperature in the range of 60 to 150 ° C for a period of 1 to 60 seconds.
2. The method according to claim 1, characterized in that the chloral hydrate in applies methanolic or aqueous solution. 1 sheet of drawings