JPH04146258A - Method for processing napped fabric - Google Patents

Abstract

PURPOSE:To enable tapering treatment without laid down fiber even in the case of a napped fabric composed of fine pile yarn, sharpen the tips of fuzz and process the subject fabric by applying a specific coating liquid to a fuzz surface layer of the napped fabric according to a noncontact method and heat- treating the resultant fabric. CONSTITUTION:A coating liquid, containing an alkali and a paste and having 10-800 P viscosity is applied to the fuzz surface layer part of a napped fabric having fuzz composed of polyester-based fiber according to a noncontact method and heat treatment is then performed to process the objective fabric. Furthermore, the aforementioned noncontact method is preferably a slit die coating or reverse coating and the coating liquid preferably contains a weight reduction accelerator.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for processing a napped fabric made of polyester fibers and having naps. In more detail,
The present invention relates to a method of processing a napped fabric made of the polyester fiber to sharpen the napped tip.

[Prior Art] The piloerection of mink fur is roughly divided into a stinging hair component and a fluffy hair component. While the cotton hair component is thin and short raised hair, the comb hair component is thick and long raised hair with a tapered tip, giving it a luxurious appearance and feel.

Among synthetic fibers, many attempts have been made to taper the ends of napped fibers made of polyester fibers to obtain napped fabrics that resemble animal hair.

For example, Japanese Patent Publication No. Sho 4L4910 proposes a method of immersing the napped tip of a napped fabric in a treatment liquid. However, when carrying out the process on an industrial scale, it is extremely difficult to uniformly immerse the raised portion of a large area of fabric in the treatment liquid. In addition, due to fluctuations in the liquid level due to movement of the fabric or vibrations of the equipment, variations in the degree of rise of the processing liquid in the direction of napping, the concentration of the processing liquid, or the processing temperature occur, making it extremely difficult to achieve uniform tapering. There's a problem.

In addition, as a method for tapering a raised fabric, Japanese Patent Application Laid-Open No. 555706
As shown in Japanese Patent No. 9 and Japanese Unexamined Patent Publication No. 56-58067, there is a method in which a viscosity treatment agent such as a solvent or a decomposing agent is applied to the raised surface by a contact method such as knife coating or textile printing and then heated. However, in this method, the napped surface is pressed down or rubbed with considerable pressure, so the napped hair is processed in a laid-down state, and a good tapered state cannot be obtained.

Furthermore, as a method for tapering a raised fabric using a non-contact method, Japanese Patent Application Laid-Open No. 57-154460 and Japanese Patent Application Laid-Open No. 622847
As disclosed in Japanese Patent No. 7, there is a method of applying a solvent or a decomposing agent in the form of a spray or foam and then heating it. However, with these methods, it is very difficult to control the amount of adhesion uniformly, and a good tapered state cannot be obtained.

[Problems to be Solved by the Invention] The present invention solves the problems of the prior art described above, that is, it is possible to uniformly apply a coating liquid without causing the napped fibers of the napped fabric to fall down, and to An object of the present invention is to provide a method for processing a napped fabric that can continuously and efficiently taper napped fibers.

[Means for Solving the Problems] In order to solve the above problems, the method for processing a raised fabric of the present invention has the following configuration. That is, it is characterized by applying a coating liquid containing an alkali and a sizing agent and having a viscosity of 10 to 800 voids by a non-contact method to the raised surface layer of a raised fabric made of polyester fibers, and then heat-treated. This is a method of processing raised fabric.

The present invention will be explained in more detail below.

The polyester fibers constituting the nap of the nap fabric used in the processing method of the present invention are polyethylene terephthalate, polybutylene terephthalate, or copolymerized with these as main components and isophthalic acid, pentasodium sulfoisophthalate, polyalkylene glycol, etc. Fibers made of modified polyester or the like are used.

The coating liquid used in the processing method of the present invention contains an alkali in order to alkali decompose the tips of the naps made of the polyester fibers and make them tapered, and to selectively process only the tips of the naps, as will be described later. It contains a sizing agent to achieve a viscosity within this range.

As the alkali, for example, sodium hydroxide, potassium hydroxide, etc. are used, and sodium hydroxide is preferable from the viewpoint of cost. The alkali concentration of the coating liquid is preferably 5 to 50 W1%, more preferably 10 to 40 wt%, from the viewpoint of treatment efficiency and solubility of alkali in water.

Further, the sizing agent is preferably an alkali-resistant sizing agent, and examples of such sizing agents include sodium polyacrylate and carboxymethyl starch.

From the viewpoint of shortening the processing time, it is also preferable to include a weight loss accelerator in the coating liquid. Examples of weight loss accelerators that are commonly used include quaternary ammonium salts, amine compounds, and phosphoric acid ester compounds.The concentration of the weight loss accelerator in the coating liquid is adjusted so as not to reduce the viscosity of the coating liquid. From the point of view 8
wj% or less is preferably selected.

The coating liquid is a mixture of these alkalis, a sizing agent, and, if necessary, a weight loss accelerator, and has a viscosity of 10 to 10%.
800 poise, preferably 30 to 500 poise, more preferably 15 to 400 poise.

In the present invention, viscosity refers to a value measured using a B-type viscometer at 25°C.

If the viscosity of the coating liquid is less than 10 voids, continuous and uniform coating will be difficult. On the other hand, if the viscosity of the coating solution exceeds 800 voids, there is a problem that a uniform thin film cannot be coated due to insufficient film properties.

In the method of the present invention, a non-contact method is used in order to apply the coating liquid to a uniform thickness on the surface of the raised fabric without destroying the raised fabric.

A non-contact coating solution application method that does not destroy the nap fibers can be achieved by using, for example, a slit die coater shown in FIG. 1 or a reverse coater shown in FIG. 2.

When using a slit die coater, the thickness of the coating liquid applied from the slit die and the clearance (gap between the tip of the die and the napped surface layer) are the same or slightly larger. The coating liquid can be applied without contacting the parts.

By this method, it is possible to apply a coating liquid without causing hairs to fall even to napped fibers with a single fiber fineness of about 0°1 denier, which tend to fall.

In addition to the above-mentioned non-contact coating method, in order to prevent the napping portion from falling due to the coating pressure of the coating solution, the angle θ of the slit die coater must be adjusted to provide resistance to the napping fibers. 90° to 0°, or even 60° to avoid
It is preferable to set the angle as small as 5°.

Here, the angle θ of the slit die coater is defined as the angle θ between the parallel plane and the coating immediately before discharge in the slit die coater, when a plane parallel to the fabric surface is taken as a reference (0°), as shown in Fig. 1. The angle formed with the liquid surface.

The thickness of the coating film is set to 5 from the viewpoint of obtaining a uniform tapered shape of the nap.
A range of 0 to 500μ is preferred. The thickness of the coating film can be controlled by adjusting the gap between the slit die when using a slit die coater, or by adjusting the distance between the base film or release paper and the knife coater when using a reverse coater.

The coating liquid is uniformly applied to the napped surface layer using a slit die coater or a reverse coater, and the oil napped structure is subsequently heat-treated.

Heating methods include dry heat at 80-150°C, 80-150°C
Either a steaming process at 30°C or a superheated steaming process at 130-200°C is employed, and steaming at 90-120°C is preferably employed from the viewpoint of facilitating control of the tapered shape.

After the processing method of the present invention, washing with hot water, washing with water, and drying are carried out by conventional methods as necessary.

Further, the dyeing step may be performed before or after the processing method of the present invention, or at the same time as the processing method. here,
Simultaneously means that the processing method of the present invention is carried out with the dye coexisting in the coating solution.

From the viewpoint of facilitating hue control, it is preferable to carry out the processing of the present invention before dyeing.

The present invention will be further described below based on Examples.

[Example] (Examples 1 to 8. Comparative Examples 1 to 4) The front filament yarn (1000-10Of) is made of polyester homopolymer, and the middle and back are made of polyester copolymer copolymerized with 10 mol% of isophthalic acid component. Using filament yarn (75D-361) with a flood shrinkage rate of 20%, the front of the 28G tissue is I10/8/9, and the middle and back are I10/1.
A 3-part tricot knitted with /2 was knitted, and the fabric was dyed, cloth-raised, and shirred to a thickness of 3.0 mm.
A raised knitted fabric with a raised length of 2.0 was produced.

Furthermore, the raised yarn was processed into an upright state using a heat brush.

Next, tapering was performed under the following conditions.

<Coating liquid formulation> - Alkali: Sodium hydroxide (solid) 2 to 30 parts - Weight loss accelerator: Quaternary ammonium salt-based "Marcellin PE5J" (manufactured by Kasei Kagaku ■) 0 to 10 parts - Sizing agent: Carboxymethyl starch type 1 Nitsuka gum 2
A'' (10% original glue) (manufactured by Nicca Chemical Industry ■) 50 parts/Water 18-46 parts The formulations for each of these Example Nos. are summarized in Table 1.

Slit die conditions> ・Gap: 100μ ・Working width: 600mm <Coating conditions> ・Coating liquid application speed: 4 m/min ・Coating liquid coating film thickness: 200μ ・Clearance: 600μ ・Nursed fabric Conveying speed = 2 m/min・Slit die angle θ: 30° Furthermore, for comparison, 10 parts of weight loss accelerator and 20 parts of water were added.
Example 1~ except that the viscosity of the coating liquid was 5 voids.
Processing was carried out in exactly the same manner as in Example 7 (Comparative Example 1).

Further, hand printing using a 100 mesh screen (Comparative Example 2) and knife coating using a small coating device (Comparative Example 3) were performed using a coating liquid having the same composition as in Example 1. Next, Table 2 shows the results of observing the coating state immediately after coating.

As can be seen from Table 2, in the coating of the present invention, the coating solution is mostly placed on the raised surface layer, making it a non-contact coating.

Subsequently, the product was steamed at 100° C. for 5 minutes using a normal pressure steamer to remove hot water, desize the product, and air dry it.

However, only the steaming in Example 8 was performed at 100°C and 25°C.
It was a minute.

The results of observing the tapered state of the nap of the obtained nap fabric are shown in FIG.

(Example 9) 100D-100f and 100D-25f on the front
Two types of filament yarns with different finenesses made of polyester homopolymer of Flood shrinkage rate 20 when copolymerized with 10 mol%
A napped knitted fabric was knitted under the same conditions as in Example 1 using a modified polyester filament yarn of 100D-361%.

Next, using the coating solution prepared in Example 3, coating was performed using a slit die coater under the following conditions.

<Slit die conditions> ・Gap = 150μ ・Working width: 600mm Coating conditions> ・Coating liquid coating speed = 4 m/min ・Coating liquid coating film thickness: 300μ ・Clearance: 800μ ・Fleated fabric Conveyance speed: 2m/min・Slit die angle: 20°The coating state was observed immediately after coating, and the coating was steamed for 5 minutes at 100°C in an ordinary pressure steamer, washed with hot water, desized, and air dried. Table 2 also shows the results of observing the tapered state of the nap of the obtained nap fabric.

(Example 10) 100D made of polyester homopolymer on the front
-10Of filament yarn, middle and back filament yarn with flood shrinkage rate of 20% made of polyester copolymer copolymerized with 10 mol% isophthalic acid component (
75D-36[), the front of the 28G tissue is I1
On 0/8/9, I got a 3-part tricot set with middle back I10/1/2 conditions. Next, dyeing, napping, and shirring are carried out using conventional methods to obtain a thickness of 3.
A raised knitted fabric with a nap length of 2.0 mm and a nap length of 2.0 mm was produced. Furthermore, the raised yarn was processed into an upright state using a heat brush.

Next, tapering was performed under the following conditions.

<Coating liquid formulation> - Alkali: 20 parts of sodium hydroxide (solid) - Weight loss accelerator: 2 parts of quaternary ammonium salt-based Marceline PE5J (manufactured by Kasei Kagaku ■) - Sizing agent: Sodium polyacrylate System's "Aron 20LJ (manufactured by Toagosei Kagaku ■) 50 parts, water 28 parts <Slit die conditions> - Gap = 50μ - Working width: 600 order <Coating conditions> - Coating liquid application speed 25 m/min・Coating film thickness of coating liquid: 100 μ ・Clearance: 2 mm ・Transportation speed of raised fabric: 2.5 m/min ・Slit die angle θ: 30° Results of observing the coating state immediately after coating and normal pressure steamer - Steam at 100℃ for 5 minutes,
Table 2 also shows the results of observing the tapered state of the nap of the napped fabric obtained by washing with hot water, descaling, and air drying.

(Example 11) Using the same napped knitted fabric and coating solution as used in Example 10, a coating film with a thickness of 300μ was formed on a polypropylene film by knife coating, as shown in Fig. 2. did. The traveling speed of the polypropylene film at this time was 5 m/min.

As shown in FIG. 3, the pile yarn was bonded onto the coating film with the pile facing downward, and steaming was performed at 100° C. for 5 minutes using an ordinary pressure steamer. Next, wash with hot water, descale, air dry,
Table 2 also shows the results of observing the tapered state of the nap of the obtained nap fabric.

[Effects of the Invention] According to the method of the present invention, even in the case of a napped fabric made of thin pile yarns that tend to fall down, ideal tapering treatment without falling down can be achieved.

[Brief explanation of drawings]

Fig. 1 is a side view showing an example of a slit die coater device for implementing the method of the present invention and a coating situation on a raised fabric, and Fig. 2 is a reverse coater device and a raised fabric for implementing the method of the present invention. FIG. FIG. 3 is a schematic side view showing an example of the tapered state of the nap of the nap fabric obtained by the method of the present invention. In the figure: 1: Coating liquid tank 2: Coating liquid feed pump Slit die Napped fabric heat treatment area Running direction of the napped fabric Knife coater Polypropylene film

Claims (4)

[Claims] (1) Applying a coating liquid containing an alkali and a sizing agent and having a viscosity of 10 to 800 poise by a non-contact method to the raised surface layer of a raised fabric made of polyester fibers,
A method for processing a raised fabric, which is then subjected to heat treatment. (2) The method for processing a raised fabric according to claim (1), wherein the non-contact method is slit die coating or reverse coating. (3) The method for processing a raised fabric according to claim (1), wherein the coating liquid contains a weight loss accelerator. (4) The nap consists of two or more types of polyester fibers with different alkali decomposition properties, and the single fiber fineness is 0.1 to
A method for processing a raised fabric according to claim (1), which is a mixture of 30 denier.