CZ300487B6 - Impregnated threading rope and impregnation process thereof� - Google Patents

Abstract

This invention discloses an impregnated threading rope (1), which is made of composite yarn (4) comprising a multifilament high strength polyamide thread or polyamide staple yarn and being provided with two impregnating coatings (2, 3). The first coating (2) is made of dressing of every rope (1) composite yarn (4) by a hydrophobic suspension. The second coating (3) consists of a surface hydrophobic dressing agent of the rope (1). Impregnation is performed for every composite yarn (4), which is preheated before wreathing, and than is applied a hydrophilic suspension to it, which dries, thermally fixes and cools again during composite yarn (4) tension. While wreathing the rope (1) on a wreathing machine from these, with this procedure impregnated composite yarn (4), is the rope (1), while tightened in tension, thermally fixed, cooled again and the hydrophobic dressing agent is applied on its surface, which hydrophobic dressing agent dries and thermally fixes during the rope (1) tension.

Description

Impregnated paper guiding rope and method of its impregnation

Technical field

BACKGROUND OF THE INVENTION The present invention relates to an impregnated papermaking lead rope and to a method of impregnating it which increasingly protects the rope from the harmful effects of the papermaking machine, in particular from the ingress of foreign chemical and mechanical substances, from high temperatures and water.

BACKGROUND OF THE INVENTION

Three types of impregnated paper roll ropes are currently known.

The first type is a paper guided rope with surface protection. Its input material is a multi-parliamentary polyamide fiber with a fineness of 940 or 1400 or 1880 dtex. After nine, six or four, the fibers twist together with a protective twist. The result is a twisted yarn, which is an input raw material for the production of knitted rope on a sp flying machine. The braided rope, seen from both eight and strand, is then impregnated with a stable hydrophobic impregnation based on organic resins. At the same time, the thermal fixation of the rope takes place, which results in an undesirable reduction in the rope elongation. This rope shows good protection against abrasion or water, but only on the surface. As soon as the outer sheath is disrupted, the surrounding foreign particles immediately penetrate the inner structure of the rope, resulting in a sharp reduction in service life. This process of disrupting the surface protection is supported by the distinctive internal friction of the individual filaments. In addition, the rope is under the influence of high temperature in the paper machine environment, which results not only in damage to the surface protective layer of the rope but also in thermal degradation of the polyamide material. As a result of these effects, the lifetime of the rope is relatively short, even though it is provided with a high-quality surface impregnation layer.

The second type is a paper guiding rope with twisted yarn protection. The starting material is a multi-parliamentary polyamide fiber with a fineness of 940 or 400 or 1880 dtex. These fibers are cut by nine, six or four with a protective twist in the twisted yarn, which in this case is also the raw material for the production of the braided rope. The individual twisted yarns are then impregnated mainly on the basis of paraffin. The application is carried out in several ways. An older method is finishing through a bath with an impregnating solution. According to a more recent process, the impregnating solution is applied to the fiber by means of application rollers. After the application process, the fiber is thermally fixed and impregnated in the twisted yarn. From this impregnated twisted yarn, a paper guiding rope, generally also eight-strand, is braided on a stranding machine. Unlike the previous procedure, this rope has a significantly longer life in the paper machine due to the deep protection of each twisted yarn. Impregnation of twisted yarns protects the rope not only from water but also from high temperature, even if the rope surface layer is damaged. The disadvantage of this protection, however, is the considerably lower stability, especially in conditions where the adverse effects in the paper machine are intensive. In addition, there is a significant shape deformation during use of the rope, which reduces the shelf life of the impregnated rope. For these reasons, impregnated lead-in ropes cannot be used in demanding sections of the paper stationary, where the impregnation with water or chemical solutions is washed out.

The third type is a paper lead rope made of water resistant materials. The input material is a multi-parliamentary polyester fiber, mostly of 1100 dtex. The filament is combined eight times under a protective twist to produce a twisted yarn, which is the feedstock for the production of a braided rope on a stranding machine, in a similar manner to the previous types of lead ropes. The product is an 8-strand braided rope that is not impregnated afterwards. The main advantage of this rope is high resistance to water and high temperature, which

It is given by the material from which the rope is made. The disadvantage is, on the other hand, a very low abrasion resistance in the paper machine because of the low elasticity of the polyester fiber. Low abrasion resistance causes frequent breaks of individual filaments, causing a significant decrease in the strength of these ropes, leading in some cases to their break. This type of lead rope therefore has a very low lifetime, despite the high heat and chemically resistant material from which the ropes are made.

It is clear from the prior art that for each type of impregnated papermaking lead rope its impregnation has achieved only a partial resistance of the rope to existing pollutants in the paper machine environment. It is therefore an object of the present invention to provide such a rope which combines all the properties of the prior art impregnated paper roll ropes, protecting the leading rope from the effects of harmful substances and influences in the paper machine environment and thereby increasing its life.

SUMMARY OF THE INVENTION

These drawbacks are largely solved by the impregnated papermaking lead rope and the impregnation method of the present invention. The essence of the rope consists of two impregnating layers, the first layer consisting of finishing each rope yarn with a hydrophobic suspension weighing 1 to 5% of the weight of the dry yarn and the second layer consisting of a surface hydrophobic fabric softener rope weighing 1 up to 6% by weight of dry rope. The two impregnation is achieved in a manner that each twisted yarn is sized before the rope is braided so that the twisted yarn is preheated to a temperature of 120 to 190 ° C, followed by a hydrophobic slurry of 1 to 5 % by weight of the dry yarn, which is dried at a tension of 1 to 100N on it and thermally fixed at a temperature of 150 to 190 ° C. The finished twisted yarn is then cooled back and, when knitting a rope of impregnated twisted yarn on a stranding machine, the rope is thermally fixed at a temperature of 200 to 300 N at a temperature of up to 200 ° C and the braided rope is cooled back. Finally, a hydrophobic fabric softener of 1 to 6% by weight of the dry rope is applied to its surface, which is dried at a tension of 300 to 1000 N on the rope and thermally fixed at 140 to 200 ° C. In this way, the papermaking lead rope is provided with a double protective layer, of which the first protective layer is located on each twisted yarn and protects the rope against the ingress of foreign matter into the internal structure of the rope. This layer also greatly increases the high temperature resistance of the rope. The second protective layer is located on the rope surface and protects the rope against abrasion, providing a higher stiffness, which results in an increase in the shape stability of the rope and in the creation of a stable impermeable layer that prevents foreign parts from entering the rope. This double protective layer greatly increases the lifetime of the lead rope when used in a paper machine, compared to the life of the prior art impregnated paper lead rope.

Overview of the drawings

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an illustration of a short section of an impregnated rope knitted from twisted yarn fiber; and FIG. 2 is a cross-sectional view of the impregnated rope.

DETAILED DESCRIPTION OF THE INVENTION

The impregnated papermaking lead rope 1 according to the invention in the illustrated embodiment is made of a twisted yarn 4, which consists of a multifilament high tenacity polyamide fiber or a polyamide staple yarn, i.e. it is made in the same or similar way as hitherto.

-2GB 300487 B6 Known unimpregnated paper ropes paper guiding ropes impregnated with impregnation methods known to date. Newly, the actual impregnation of this rope 1, which is carried out in two impregnation layers 2, 3, is solved so that the first impregnation layer 2 consists of finishing each twisted yarn 4 with a hydrophobic suspension weighing 3-4% by weight of dry yarn 4. for example based on paraffin and the second impregnation coating 3 is formed by a surface hydrophobic fabric conditioner of a rope 1 having a weight of 3 to 5% by weight of a dry rope 1, eg based on organic resins.

The method of impregnating the papermaking line 1 according to the invention is such that each of the twisted yarn 4, made by combining six polyamide multifilament fibers on a circular twisting machine under a twist of 84 z / m, is impregnated on a finishing stand where the twisted yarn 4 unwinds through the entrance galets to the fixation chamber. There, the twisted yarn 4 is preheated to a temperature of about 170 ° C and then passes through a space where a finishing consisting of a hydrophobic suspension, for example based on paraffin, is applied, with a deposit of about 3% by weight of the dry twisted yarn 4.

The finish is applied to the twisted yarn 4 by means of spreading discs which wade in containers with a hydrophobic suspension. After finishing, it is dried on a twisted yarn 4 in a fixation chamber and thermally fixed under a stable tension in a tension of approx. 50 N. The dried and impregnated twisted yarn 4 is then re-cooled on the output galets and wound on paper tubes at minimum tension. . From these tubes, the impregnated twisted yarn 4 is rewound on a winding stand and at the same time combines into two to five yarns 4 into bobbins which are placed on the spindles of the flying machine. The impregnation in this first coating ensures perfect protection of the inner twisted yarns 4 of the rope 1 against chemical and thermal degradation. On the sp flying machine, where the rope 1 is knitted from already impregnated yarns 4, then the knitted rope 1 passes through infrared emitters where it is fixed at its stable tensile strength of 200 to 300 N and at a temperature of approx. winding on the winding drum sp of the flying machine, where the rope 1 is also gradually cooled back. An impregnation coating of 4 to 5% by weight of the dry rope 1 is applied to the rope 1 thus prepared by passing it over a bath with a hydrophobic finish, for example based on organic resins. Then the rope 1 passes through a system of squeezing rollers and nozzles which ensure penetration of the impregnation into the inner layers of the rope 1 and removal of excess impregnation from its surface. Finally, the impregnated rope 1 is fed into the fixation chamber, where, at its stable tensile strength of about 500 N, the impregnation is dried and fixed at a temperature of 165 to 195 ° C. After passing the impregnated rope 1 through the fixing chamber, it is wound onto a metal winding drum. The impregnation in this second coating, located on the surface of the paper lead rope 1, forms a stable impermeable layer thereon which protects it against the ingress of foreign particles, against abrasion and which ensures a higher rigidity of the rope and hence its shape stability.

Industrial applicability

The solution according to the invention is useful in the production of impregnated paper rope, but can also be applied in the production of special braided ropes and long or flat technical textiles from natural or synthetic fibers with the necessary impregnation against foreign harmful substances and influences. products.

Claims (2)

PATENT CLAIMS 1. An impregnated papermaking lead rope made of a twisted yarn (4) comprising a multifilament high-strength polyamide fiber or polyamide staple yarn, characterized in that the rope (1) is provided with two impregnation layers (2, 3) of which the first impregnation The deposit (2) is formed by finishing each twisted yarn (4) of the rope (1) with a hydrophobic suspension weighing 1 to 5% of the weight of the dry twisted yarn (4) and the second deposit (3) is a surface hydrophobic fabric softener. by weight of 1 to 6% by weight of the dry rope (1). 2. The method of impregnating a papermaking lead according to claim 1, wherein each twisted yarn (4) is pre-knitted prior to knitting such that the twisted yarn (4) is preheated to a temperature of 120 to 190 [deg.] C. and then hydrophobic. a suspension having a deposit of 1 to 5% by weight The dry twisted yarn (4) is dried and thermally fixed at a temperature of 150 to 190 ° C at a tension tension of 1 to 100 N, and the finished twisted yarn (4) is then cooled back, and then the rope is braided (1) from impregnated twisted yarns (4) on a stranding machine, this rope (1) is thermally fixed at a temperature of 200 to 300 N at a temperature of up to 200 ° C, then the rope (1) is cooled back and on its surface apply a hydrophobic fabric softener with a coating of 1 to 6% by weight of the dry rope (1), 20 which is dried at a tension of the rope (1) with a force of 300 to 1000 N and thermally fixed at a temperature of 140 to 200 ° C.