KR100595595B1 - Process for preparing elastic yarn package to be unwound uniformally - Google Patents

Abstract

The present invention is characterized in that the resilient yarn rewinding using this yarn after the production of the yarn, in order to achieve the improvement of maritime properties, when rewinding the elastic yarn, such as paper pipe or plastic pipe The winding angle (ie, ridge angle) wound on the core should be kept at 10 to 30 degrees, and the magnesium stearate, calcium stearate, magnesium oxide, calcium oxide, To prevent adhesion between yarns by imparting an anti-sticking agent such as titanium oxide or by applying a lubricant such as a silicone-based oil such as polydimethylsiloxane or a hydrocarbon-based oil such as paraffin, and do not impart an anti-sticking agent or lubricant to the polymer. In this case, the silicone-based or hydrocarbon-based component alone or an emulsion containing the component is applied in the process of winding up the polymer after spinning. To provide lubricity.

Elastic yarn, Winding body, Rolling take off, Over the end take off, Anti-sticking agent, Lubricant, Sea-driving force, Maritime property, Volume, Winding angle, Rewinding, OTETO maritime property, Diaper Power

Description

Process for Preparing Elastic Yarn Package to be Unwound Uniformally             

Figure 1 shows the winding ridge angle (Θ) of the elastic yarn winding body produced by the present invention.

The present invention relates to a method for manufacturing an elastic yarn winding body, and more particularly, in order to continuously use the elastic yarn used in hygiene products, a conventional rolling take-off (RTO) method and another over-end end take With respect to the over-the-end-take-off (OTETO) method, a winding angle (i.e., winding on a core such as a paper tube or a plastic tube) after rewinding (ie, Ridge) is maintained at 10 to 30 degrees, and the polymer is imparted with an anti-sticking agent such as magnesium stearate, calcium stearate, magnesium oxide, calcium oxide, titanium oxide, or polydimethyl Lubricants such as silicone-based emulsions such as dimethyl siloxane or hydrocarbon-based emulsions such as paraffin are applied to prevent inter-stick adhesion, and anti-adhesives to the polymer In the case where no lubricant is added, the present invention relates to a method for producing an elastic yarn winding body provided with lubricating property by applying a silicone-based or hydrocarbon-based component alone or an emulsion containing the component in the process of winding up the polymer after spinning.

Elastic yarns are widely used in industrial, medical, and clothing applications that require elasticity because of their excellent elastic recovery and improved fit.However, the use of hygienic products such as diapers and sanitary napkins is increasing worldwide. Is in.

The elastic yarns used in this sanitary article are usually provided as winding bodies, except for some rubber yarns. The elastic yarns are used by dissolving elastic yarns from the winding bodies. To be excellent is basic. By the way, the non-uniformity of the sea power is more serious problem in the over-end take-off method than the conventional rolling take-off method, the sea non-uniformity even causes a decrease in the post-process operation rate by trimming the elastic yarn. In general, the elastic yarn has a high adhesive strength between yarns due to the nature of the polymer, and in general, since the rolling take-off method has been applied, it is not easy to maintain a uniform sea power by applying the over-end take-off method. When the winding amount of the winding body is increased, the variation in the maritime tension between the winding body layers becomes larger, and in particular, uniform seaming and prevention of trimming of the inner layer having high stress are particularly difficult problems. Of course, the smaller the amount of yarn wound on the winding body, the smaller the deviation of the sea power between the inside and the outside of the winding body, so that more uniform sea power can be secured, but the cost burden of the winding body producer and the winding of the sanitary goods manufacturer worker Because of the burden of increasing the frequency of exchange, the volume reduction of the winding body itself is not very economical.

In general, when the volume of the elastic yarn winding body is large, the productivity in the hygiene product production process is high, but the seamability is poor due to the adhesion between the wound elastic yarn. As such, if the maritime property and the sea power are not constant, there is a problem in that the wearing pressure and appearance of the sanitary products are different, resulting in an increase in dissatisfaction of the real user, and frequent operation of the thread in the production process of the sanitary products causes a very poor operation rate. . Therefore, there is a demand for the development of a technique capable of improving the maritime properties while increasing the volume of the elastic yarn winding body.

Korean Patent No. 132788 (Registration No. 97-991) sets the winding shrinkage rate of the elastic yarn winding body low in order to improve the problem that the elastic yarn itself has high adhesive strength and does not deteriorate. It is proposed a technique to increase the amount of emulsion deposition within the range, the content is the ratio of the winding width (A) and the winding thickness (B) (B / A) is 0.4 or more and the elastic yarn appearance elongation (C) in the winding body ( %) And the elastic agent coating agent D (weight%) of the elastic yarn are elastic yarn winding bodies having a relationship of D-5 ≦ C ≦ D + 5 and D ≦ 2.

However, since the conventional elastic yarn winding body has an oil adhesion amount of 2% by weight or less, and the winding thickness (B) / winding width (A) is 0.4 or more, the seam tension of the outer layer and the inner layer during the production of a multi-volume winding body of 1.5 kg or more is increased. There is a problem in that a large number of trimming occurs in the post-process which causes the difference to largely dissolve the thread.

In addition, the contents mentioned in the Korean Patent No. 132788 are technical contents corresponding to the conventional method of the conventional method of rolling take-off method, and when the elastic yarn products manufactured by the concept and method are interpreted by the over-end end-off method. It is difficult to ensure good maritime properties.

The present invention has been made to produce an elastic yarn winding body that is more applicable to the over-end end take-off dissolving method, which has been actively introduced in recent years, with the remaining problems of the conventional rolling take-off dissolving method described above, without using a large amount of emulsion. It is to provide an elastic yarn winding body for over-end take-off that can significantly improve the sea resolution and at the same time increase the volume to improve productivity.

For achieving the above object of the present invention

The elastic yarn winding of the present invention is characterized in that it is rewound using elastic yarn simulation, and the winding angle at the time of rewinding is 10 to 30 degrees.

In addition, one or two or more anti-sticking agents selected from magnesium stearate, calcium stearate, magnesium oxide, calcium oxide or titanium oxide in the polyurethane-based or polyurethaneurea-based polymer for producing the elastic yarn winding body, The content of the anti-sticking agent is preferably 0.1 to 3.0% by weight based on the polymer solids.

In addition, in the polyurethane-based or polyurethane urea-based polymer for producing the elastic yarn winding body comprises a lubricant selected from polydimethylsiloxane or hydrocarbon, the content of the lubricant is preferably 0.5 to 4.5% by weight relative to the solid content.

In addition, it is preferable to use an emulsion containing polydimethylsiloxane or hydrocarbon when winding or rewinding the elastic yarn wool, and the content of the emulsion is preferably 0.5 to 3% based on the weight of the yarn.

Hereinafter, the present invention will be described in more detail.

The elastic yarn to which the present invention can be applied is not particularly limited, such as polyether-based polyurethane-based elastic yarn, polyester-based elastic yarn, polyamide-based elastic yarn, and the like.

The segmented polyurethane polymer that can be used to prepare the elastic yarn of the present invention is prepared by reacting organic diisocyanate and polymer diol to prepare a polyurethane precursor as known in the art to which the present invention belongs, and then dissolving it in an organic solvent. And reacted with diamines and monoamines.

The organic diisocyanate used in the present invention includes diphenylmethane-4,4'-diisocyanate, hexamethylene diisocyanate, toluene diisocyanate, butylene diisocyanate, hydrogenated P, P-methylene diisocyanate and the like. As the polymer diol, polytetramethylene ether glycol, polypropylene glycol, polycarbonate diol, and the like may be used. The diamines are used as chain extenders, and examples thereof include ethylenediamine, propylenediamine, hydrazine, and the like. In addition, the monoamine is used as a chain terminator, and examples thereof include diethylamine, monoethanolamine, dimethylamine, and the like. In addition to the above-mentioned components, as the other additives, UV stabilizers, antioxidants, NOx gas yellowing inhibitors, dyeing enhancers, chlorine resistant agents and the like may be additionally used.

The core technical configuration of the present invention is to add magnesium stearate, calcium stearate, magnesium oxide, calcium oxide, titanium oxide, and the like as an anti-sticking agent to the polymer during elastic yarn polymerization. At this time, the content of the anti-sticking agent used is preferably 0.1 to 3.0% by weight based on the polymer solids. If the content of the anti-sticking agent is less than 0.1% by weight, the effect of lowering the adhesion between the edges is insignificant, and since it cannot be smoothly dissolved, it is difficult to apply for OTETO. It is possible to improve the maritime property by excellent effect, but there is a problem in that the spinning workability deteriorates rapidly due to an increase in aggregation between inorganic additives due to an increase in the input content.

In addition, the core technology configuration of the present invention is a silicone-based emulsion such as polydimethylsiloxane (polydimethylsiloxane) or a lubricant such as a hydrocarbon-based emulsion such as paraffin (Paraffin) is added to the polymer to stick between yarns Characterized in that to prevent. At this time, the amount of lubricant used is preferably 0.5 to 4.5% by weight based on the polymer solids. If the lubricant content is less than 0.5% by weight, the effect of reducing the interlude friction or the improvement of nautical properties by anti-sticking is insufficient.If the lubricant content is greater than 4.5% by weight, the spandex yarn and the adhesive may be used in the manufacture of diapers. Insufficient adhesion, or inadequate adhesion between the spandex yarn and the nonwoven fabric (or film) can cause fatal defects.

In the present invention, since the anti-adhesion between the yarns is prevented by applying an anti-sticking agent or a lubricant to the polymer, it is possible to primarily remove the possibility of poor degradability when dissolving in the over-end take off method.

In the present invention, after the elastic yarn wool yarn is produced from the polymer, the yarn is rewound with a rewinder, and the winding ridge angle is set within 10 to 30 degrees to remove the secondary matters. Ideal winding formation was difficult at 3 degrees below the winding ridge, and maritime defects occurred between 4 and 9 degrees, and ballooning at sea level was extremely poor at sea temperatures between 31 and 38 degrees. And, at 39 degrees or more, there is a problem that the winding is wound in a very narrow width, the four layers collapsed during winding.

In addition, in the present invention, when the anti-sticking agent or lubricant is not added to the polymer, the silicone-based or hydrocarbon-based component alone or an emulsion containing the component when winding up the yarn or rewinding the yarn for the purpose of improving maritime properties. Was applied, but the effect of improving the disintegration property obtained by applying the emulsion component during the production or rewinding of the wool was the same. At this time, the content of the emulsion is preferably 0.5 to 3% by weight based on the weight of the yarn. When the content of the emulsion is less than 0.5% by weight, the effect of improving sea ash by reducing the friction between the sand or preventing the adhesion is insufficient, and when the content of the emulsion is more than 3% by weight, the spandex yarn and the adhesive may be used in the manufacture of diapers. Insufficient adhesion or insufficient adhesion between spandex yarn and the nonwoven (or film) can cause fatal defects.

The elastic yarn fineness of the present invention is preferably 100 denier or more, and there is no limitation on the winding width and the winding amount of the winding body, but the winding width is preferably about 75 to 300 mm and the winding amount is about 1.5 to 7 kg.

Hereinafter, the present invention will be described in more detail with reference to examples, but these examples are for illustrative purposes only and should not be construed as limiting the scope of the present invention.

Examples 1 to 4, Comparative Example 1

518 g of diphenylmethane-4,4'-diisocyanate and 2328 g of polytetramethylene ether glycol (molecular weight 1800) were reacted with stirring at 85 ° C. for 90 minutes in a nitrogen stream to prepare a polyurethane precursor containing an isocyanate at both ends. . After the polyurethane precursor was cooled to room temperature, 4643 g of dimethylacetamide was added thereto and dissolved to obtain a polyurethane precursor solution. Subsequently, a solution in which 54 g of propylenediamine and 9.1 g of diethylamine were dissolved in 1889 g of dimethylacetamide was added to the polyurethane precursor solution at 10 ° C. or lower to prepare a segmented polyurethane urea polymer solution.

Magnesium stearate was added 0.1% (Example 1), 0.4% (Example 2), 0.7% (Example 3), 3.0% (Example 4), 5.0% (Comparative Example 1) as an anti-sticking agent to the polymer. After defoaming, the spinning temperature was adjusted to 250 ° C. in a dry spinning process, and 3 kg of polyurethane elastic yarn simulation of 720d was wound up, and this yarn was rewinded using a rewinder (manufactured by SSM), and the winding angle was constant at 18 degrees. It was set as the type.

The interlayer dissipation force and uniformity of the rewinding winding body thus manufactured were evaluated, and the dissolution property was evaluated in the over-end take-off dissolving apparatus used in the diaper (disposable diaper) manufacturing facility. Table 1 shows.

Examples 5-8, Comparative Example 2

A rewinding winding body was prepared in the same manner as in Example 1, but calcium stearate was used as an anti-sticking agent. The evaluation results are shown in Table 1 below.

Examples 9-12, Comparative Example 3

A rewinding winding body was prepared in the same manner as in Example 1, but magnesium oxide was used as an anti-sticking agent. The evaluation results are shown in Table 1 below.

Examples 13-16, Comparative Example 4

A rewinding winding body was prepared in the same manner as in Example 1, but titanium oxide was used as an anti-sticking agent. The evaluation results are shown in Table 1 below.

Examples 17-19, Comparative Example 5

A rewinding winding body was prepared in the same manner as in Example 1, but 10 centipoise of polydimethylsiloxane (cp) was added to the polymer as a lubricant instead of an anti-sticking agent, 0.5% was added (Example 17), and 1.0% was added (these were carried out. Example 18), 3.0% input (Example 19), 5.0% input (Comparative Example 5) The evaluation results are shown in Table 1 below.

Examples 20-22, Comparative Example 6

A rewinding winding body was prepared in the same manner as in Example 17, except that 10 centipoise (cp) of hydrocarbon (alkene + cycloalkane) was added to the polymer as a lubricant instead of polydimethylsiloxane (Example 20). , 1.0% input (Example 21), 4.5% input (Example 22), 6.0% input (Comparative Example 6) The evaluation results are shown in Table 1 below.

Examples 23-25, Comparative Example 7

        In the same manner as in Example 1, a rewinding winding body was prepared, but an anti-sticking agent or lubricant was not added to the polymer, and a spinning oil containing 60% and 40% of polydimethylsiloxane and hydrocarbon in the winding process of the rewinding company, respectively. The lubricant was supplied to the yarn of elastic yarn using. The lubricant supply amount was 0.5% (Example 23), 1.0% (Example 24), 3.0% (Example 25), 5.0% (Comparative Example 7), and the results are shown in Tables 1 and 2 below. It was.

Comparative Example 8

A rewinding winding body was prepared in the same manner as in Example 1, except that an anti-sticking agent and a lubricant were not added to the polymer, and no spinning oil was applied when rewinding. The evaluation results are shown in Table 1 below.

TABLE 1

TABLE 2

Examples 26-31, Comparative Examples 9-22

Prepare a rewinding winding body in the same manner as in Example 1, but added magnesium stearate by content (0.4%, 3.0%) as an anti-sticking agent, and the winding angles when rewinding were 3 degrees, 4 degrees, and 9 degrees. , 18 degrees, 25 degrees, 30 degrees, 35 degrees, 38 degrees, 39 degrees, 45 degrees, the results of evaluation for each condition are shown in Table 3 below.

TABLE 3

Comparative Examples 23 to 33

Except for adjusting the winding angle was carried out in the same manner as in Comparative Example 8, the results are shown in Table 4 below.

TABLE 4

[Assessment Methods]

* Sea power for each winding part: The sea power shown in the above table is the average level and deviation of the sea power when the outer, middle and inner layers of the winding are dismantled by OETO method using Rothschild F-Meter Winder R1083. It shows laboratory data which measured. It is not important that the absolute value (average) is large or low, and the uniformity (deviation) between the outside, the middle, the inner layer, and within one layer is important. In addition, the meaning of the sea power is a downstream characteristic that is expressed by combining the elastic modulus, winding shrinkage ratio, and the cohesion between yarns. There is no standardized method of measuring this sea power in BISFA.

* OETO method maritime decay: It is put into the process of manufacturing the actual diaper, and it decomposes by OETO method, and measures the rate of trimming due to poor maritime defects. It represents the number of trimmed averages in one day by feeding into one diaper manufacturing machine. The operating condition of the diaper manufacturing machine is 250% of elastic yarn draw ratio (DR) and the manufacturing speed of diaper is about 450 sheets per minute based on infant diaper.

* Diaper Power (Leg): Dissolves the elastic yarn by the above OETO method, passes through the tension controller (KTF's BTSR, etc.), which is an appropriate sea power adjusting device, and puts it into the diaper manufacturing machine and applies it to the leg part of the diaper. The power of the leg part of the manufactured diaper product is evaluated by using Inston, an elongation measuring instrument. The mean value is also important, but uniformity is particularly important. The uniformity of diaper power means the power uniformity of elastic yarn used in the manufacture of diaper.

The wound body manufacturing method provided by the present invention greatly improves the dissolvability of the elastic yarn used in the over-end take-off dissolution method, which is recently applied in the sanitary product manufacturing process, and improves the operation rate of hygienic goods manufacturers such as diapers and sanitary napkins. It can contribute to cost reduction.

Claims (4)

delete In the polyurethane-based or polyurethane urea-based elastic yarn winding body of 400 to 2000 denier, The elastic yarn winding is to be re-wound by the winding angle of 10 to 30 degrees using an elastic yarn simulation, The elastic yarn wool yarn contains at least one anti-sticking agent selected from the group consisting of magnesium stearate, calcium stearate, magnesium oxide, calcium oxide or titanium oxide in the polyurethane-based or polyurethaneurea-based polymers in an amount of 0.1 to 3.0 wt% based on the weight of the polymer solids. An elastic yarn winding body excellent in sea property, characterized by the above-mentioned. In the polyurethane-based or polyurethane urea-based elastic yarn winding body of 400 to 2000 denier, The elastic yarn winding is to be re-wound by the winding angle of 10 to 30 degrees using an elastic yarn simulation, The elastic yarn wool yarn is excellent elastic yarn winding body characterized in that the polyurethane-based polyurethane urea-based polymer containing a lubricant selected from polydimethylsiloxane or hydrocarbon 0.5 to 4.5% by weight relative to the weight of the polymer solids. In the polyurethane-based or polyurethane urea-based elastic yarn winding body of 400 to 2000 denier, The elastic yarn winding is to be re-wound by the winding angle of 10 to 30 degrees using an elastic yarn simulation, The elastic yarn winding body having excellent sea-sailing properties, characterized in that the oil containing polydimethylsiloxane or hydrocarbon is given in 0.5 to 3% by weight relative to the weight of the elastic yarn wool yarn when winding or rewinding the elastic yarn wool yarn.

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