DE2436997A1 - Sewing thread material - is composed of synthetic filament core cladded with staple fibre material to withstand friction heat of high-speed needles - Google Patents

Abstract

Sewing thread in the form of a core yarn, where the core is of continuous, stretched and fixed synthetic spun material and the cladding uses fibres of vegetable or semi- or full-synthetic origin. The cladding is twisted at the same rate as the core so that it is fully cladded. Two or more of these cored threads, which have been twisted in opposite directions, are twisted together so that the end product is free of loops. The process allows a two-component thread to be formed from a mixture of continuous filament and staple fibres to increase the range of effects, withstanding friction heat up to 400 degrees C at the needles of high-speed sewing machines.

Description

Sewing thread made of core thread The invention relates to a sewing thread, which is wholly or partially made of core yarn.

In the context of the invention, core yarn is understood to mean a thread which is primarily composed of two components.

In the course of the spinning process, a thread, mainly textile, is used Textile material laid and connected to the first, the inner thread by twisting. According to this known process for the production of core yarns is located the so-called inner or soul thread is always in the middle of the finished product; d. H. the wrapping is done in such a way that the core thread is usually fully covered is.

For the best possible connection between the thread of the soul and the wrapping are different Proposals became known.

Such Ooregarne can in a known manner, the respective Purpose assigned; t, made from a wide variety of materials composed be. The soul thread can z. B. consist of synthetic endless material; the Wrapping material can be synthetic or animal to achieve the desired effects or of vegetable origin. It can also be made up of mixtures of these different Materials exist.

These core threads or yarns, which are known per se, become more known Techniques processed into various end products.

So was z. B. suggested in weaving by incorporating such Core yarns to achieve a particularly structured surface. For a special one Crepe effect was further suggested as a no or only slight soul thread to choose stretched synthetic material after processing it into a flat structure in a subsequent fixing process a desired shrinkage and thus a special one to achieve a structured surface (G.M. 1760165).

According to another suggestion, spinning and twisting should be carried out at the same time be combined in one operation, whereby for better adhesion of the wrapping materials these are provided with a spinning size (G.M. 1799659).

According to another proposal that has become known, production should be carried out of the core yarn in such a way that spin twist and subsequent twist twist oppose each other in the direction of rotation, which ultimately results in an open or almost open, i.e. rotation-free thread association is created. The particular advantage of this The proposed method should be as voluminous as possible, d. H.

consist of material capable of covering in the fabric (DAS 1155040).

It was also proposed to improve the adhesion of soul thread - Wrapping to heat or pasteify the synthetic core thread so much, that the wrapping fibers or threads in use with a corresponding roll-in pressed or rolled into the soul thread (DAS 1222827).

The invention relates to a sewing thread made from core yarns.

According to the invention it was recognized that a combination of endless synthetic Material in connection with staple material for the preparation of an optimal sewing thread can have particular technological and application advantages if it is achieved that in the finished sewing thread on the one hand the high tensile strength of the endless synthetic material and on the other hand the required special surface structure is achieved. One for versatile and especially for fast sewing processes suitable sewing thread is the subject of the invention.

According to the invention, a core yarn processed into endless, with regard to synthetic thread that is largely stretched and fixed in its vent stretching process, used as a soul. The wrapping can, the respective end-use purpose assigned as a sewing thread, consist of staple threads or fibers of various origins. According to the invention, the wrapping material can be particularly advantageously long-stapled Cotton or torn or cut thread parts, fully or semi-aesthetic Be origin. One such for the manufacture of sewing threads according to the invention aligned core yarn is compared to conventional spinning twists with a high spinning twist, z. B. 1000 Drehungenlm generated, according to the invention it was recognized that a excessive spin twist for the subsequent twisting process to produce a largely Kringle-free sewing thread, especially for an optimal adhesive connection of the core thread - Wrapping material, is of crucial importance. The relationship between the soul thread Wrapping material according to the invention is about 70% core thread at 30 ffi wrapping material; wherein the technique of wrapping is chosen so that the wrapping material the Soul thread completely covers. Through this perfect so-called disguise of the Core thread is achieved according to the invention that those made from these core yarns .The surface of the sewing threads consists exclusively of covering material, and are aligned in such a way that the wrapping material is roughly spiral-scale-like is spun on the thread of the soul.

Let the technical development and further training of the sewing machines Increasingly high sewing speeds, which is why the thread passed through the needle due to the high level of needle heating, at least when it is stopped at the moment heat damage during sewing in the needle. This significant exposure to heat - it can reach up to 4000C on the needle on fast-running sewing machines - is There are special requirements for the sewing thread used to form the seam. This during to counteract the unavoidable high needle heating that occurs during the sewing process, d. H. Making the sewing thread suitable for such adverse circumstances is ultimately in the particular object of the invention.

The core yarn used according to the invention with staple material on his In connection with the final twist, the surface results in a roughly rough one Thread surface. This rough thread surface leaves during the fast running During the sewing process, small air particles are constantly being carried away on the surface, causing excessive heating of the needle is prevented. At the same time, if the Wrapping z. B. is made of cotton, a heat insulating function. These The cooling effect achieved with the sewing thread made of core yarn according to the invention is for one trouble-free sewing operation of extraordinary lightness. The knowledge one To create sewing thread in which on the one hand an optimally high strength and on the other hand the aforementioned needle cooling is achieved, outlines the foregoing invention and it took a number of considerations and a multitude of attempts to achieve them to incorporate both requirements into a sewing thread product.

In order to achieve the necessary sewing thread strength, according to the invention two or three such single core yarns combined. Your intimate connection takes place in a manner known per se by twisting. The twists are in accordance with of the invention against the spin rotation and that with approximately the same rotation size set.

Then the core sewing thread produced in the spinning and twisting process is used colored in a manner known per se and thereby resp.

below with the sewing threads for high processing speed the usual finishing agents (e.g. various waxes, ceresin, paraffin, etc.).

The subject of the invention is thus a sewing thread which is suitable the demands of high strength that arise at high sewing speeds while at the same time achieving the necessary needle cooling and thus protecting the synthetic To withstand the thread core against exposure to excessive heat.

The invention is explained in more detail in the following exemplary embodiment: A core yarn, formed from a pre-stretched, largely fixed so-called Core thread made of polyester dtex 74, becomes with 1050 turns S with long staple Cotton spun around in such a way that the soul thread is completely covered.

The proportion of wrapping material to the soul thread is around 65 % Soul thread and 35 ° / s wrapping material and the end number dtex 125. Two of these Core yarns are made with 1080 Z twists after known cleaning or plying twisted together using the wet twisting process. These are rewound to dye packages, dried and wound into sales spools. The thread surface is with provided with a sliding finish.

Claim:

Claims (1)

PATENT CLAIM Sewing thread made of core yarn, thus g e k e n n z e i c It doesn't mean that a thread of the soul consists of endless, largely stretched out and fixed synthetic material in the spinning process with fibers or thread parts of vegetable, semi or fully synthetic origin with simultaneous twisting so coated becomes that the thread of the soul is completely covered, and that two or more such Cords with a twist opposite to that of the spin twist, twisted together with the proviso that the thread structure twisted in this way is largely free of curls is.