JPH073665A - Dyeing of sewn product - Google Patents

Abstract

PURPOSE:To provide a dyeing process capable of dyeing a sewn product while suppressing the occurrence of puckering, fluff and crease at the seam part. CONSTITUTION:A sewn product is produced by using a cellulosic cloth applied with 5-50wt.% of a polyethylene glycol having a molecular weight of 400-20,000. The sewn product is crosslinked with formaldehyde in vapor phase and dyed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of dyeing a sewn product made of a cellulose fiber cloth.

[0002]

2. Description of the Related Art A method in which a cloth made of cellulose fibers is sewn and then dyed has been vigorously carried out in the past several years, which is called product dyeing. However, the dyed product has a problem that it does not look as good as a normal product in which a dyed fabric is sewn and its appearance is significantly different. That is, since the dyed product is dyed after sewing, a shrinkage difference occurs between the seam portion and the non-seam portion, which causes puckering, and the fabric surface is fluffy or glossy. As it is damaged, it has an appearance with a feeling of being used or washed.

Therefore, the dyed products using the cellulosic fiber cloth are commercialized only in the casual and fashion fields where the feeling of second hand and worn-out feeling are required.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of such a situation as described above, and it is possible to dye a sewn product made of a cellulosic fiber cloth without giving a secondhanded appearance. The purpose is.

[0005]

SUMMARY OF THE INVENTION The present invention achieves the above object and has the following configuration. That is, the present invention is characterized in that a sewn product made of a cellulose cloth containing 5 to 50% by weight of polyethylene glycol having a molecular weight of 400 to 20,000 is crosslinked with formaldehyde in a gas phase and then dyed. The gist is a method of dyeing a sewn product.

The present invention will be described in detail below.

Cellulose fibers applicable to the present invention are
Examples of the material include cotton, hemp, rayon, and the like, and a composite material such as a mixed fiber of these fibers and a synthetic fiber or a natural protein fiber such as wool and silk, mixed twist, and mixed weave. In this case, it is desirable that at least 30% or more of the cellulose fiber is contained.

First, a woven or knitted fabric composed of these fibers is subjected to scouring, bleaching, and calcination by a usual method, and, if necessary, mercerizing. For fabrics that use warping glue during warping, desizing is performed.

Next, an aqueous solution of polyethylene glycol is uniformly applied using a padding device, and water is removed using a dryer.

The polyethylene glycol used is optimally one having a molecular weight of about 400 to 20,000. If the molecular weight is 400 or less, the fluidity is large and the cloth is sticky, making it difficult to sew. Also, if the molecular weight is 20,000 or more, the water solubility is low, and it takes time and effort to dissolve it in an aqueous solution, and the cost is also high. It is not suitable because it will be expensive. Applying these polyethylene glycols to the dough is 5-5
The concentration of the aqueous solution is adjusted to 0% by weight before use.

The cloth thus pretreated is used to sew in a desired shape.

Here, these sewn products are subjected to a crosslinking treatment using formaldehyde and an acid catalyst. To carry out the cross-linking treatment of cellulosic fibers in the gas phase with formaldehyde, a method of mixing an aqueous formaldehyde solution with high-pressure steam and using it as a mixed gas with water, formaldehyde gas generated by heating paraformaldehyde with mineral oil is used. And a method of using a methanol solution of formaldehyde as a mixed gas with methanol can be used. Hydrogen chloride, sulfurous acid gas or the like can be used as the catalyst.

At the time of the crosslinking treatment, formaldehyde is preferably bound to the cellulose fiber in an amount of about 0.1 to 0.5% by weight. The crosslinking reaction is completed by heat treatment at 50 to 130 ° C. for 5 to 30 minutes.

In the method of the present invention, the formaldehyde-crosslinked sewn product is dyed. At the time of dyeing, a paddle type dyeing machine, a rotary type dyeing machine, an Overmeier dyeing machine or the like is used as a dyeing machine, and a dye such as a reactive dye, a direct dye or a vat dye is used as a dyeing agent. Dye according to the product dyeing method.

[0015]

[Operation] The essence of the method of the present invention is to sew a cloth preliminarily impregnated with polyethylene glycol, cross-link it in the vapor phase of formaldehyde, and then dye the product. In order to meet recent demands for short delivery times, small lots, and multi-product production, dyeing products after sewing has become a very important production system. In this case, as in the present invention, if the sewn product is subjected to a crosslinking treatment in a vapor phase state without being wetted with water in advance, the sewn state is retained even after the dyeing process using the next water is finished. Unlike ordinary dyeing of cellulosic fiber products, puckering, wrinkles, fluff, etc. are much less likely to occur, and a product with an appearance that is almost the same as general products dyed with cloth for sewing is obtained. I found that I can do it. This is because the form retention was imparted to the cellulose fiber by the cross-linking of formaldehyde, and as a result, shrinkage resistance, wrinkle resistance, pleating retention, etc. were improved, and the change in morphology was suppressed even during the dyeing process. Is.

When formaldehyde is subjected to a crosslinking treatment for the purpose of maintaining the shape of the sewn product, the swelling property of the fiber in water is lowered, so that the dyeing property is deteriorated. To deal with this problem, if polyethylene glycol is added to the fiber in advance as in the present invention, the fiber has hydrophilicity even after the crosslinking treatment with formaldehyde, so that the deterioration of dyeability is suppressed. Will be able to. It is presumed that this is because the distribution region of the cross-linking portion of formaldehyde is changed by pre-filling the amorphous region of the cellulosic fiber molecule with polyethylene glycol.
In other words, it is considered that in the amorphous region, a portion where a relatively large amount of water molecules are likely to enter has been swollen with polyethylene glycol in advance, which makes it difficult to form crosslinks in the portion having a relatively wide molecular gap. . In addition, although this polyethylene glycol is partially cross-linked with formaldehyde, most of it is dissolved in water during dyeing, and it is less likely that dyeability is impaired.

[0017]

EXAMPLES Next, the method of the present invention will be described more specifically by way of examples.

Example 1 A plain woven fabric of 100% cotton (both warp and weft 40 single yarn, warp density 115 yarns / inch, weft density 75 yarns / inch) was quilled, desizing, scouring and bleaching in the usual manner. , After mercerizing,
An aqueous solution of polyethylene glycol 150 g / l having a molecular weight of 1,200 was prepared, adjusted to a pickup of 60% using a padding device and applied, and then water was removed by a drier.

Next, a dress shirt was sewn using this woven fabric.

Here, formaldehyde was vaporized at a concentration of 70,000 ppm using a gas-phase formaldehyde processing apparatus, and hydrogen sulfide of 5,000 ppm was used as a catalyst, and the amount of formaldehyde cross-linking was about 0.7. %, Heat treatment was performed at 120 ° C. for 4 minutes to complete the crosslinking reaction with formaldehyde.

After that, a rotary dyeing machine was used to dye light blue with a reactive dye (2.5% owf) by a conventional method, and thereafter, a tumble dryer was used for drying.

The dress shirt which has been processed in this way has a very beautiful appearance, has almost no puckering or fluffing, and can be sewn after dyeing only by lightly ironing it. It looked like a product.

For comparison with the present invention, a dress shirt was obtained in the same manner as in this example except that the vapor phase formaldehyde crosslinking was omitted in this example. This dyed product had puckering at the seams, fluffs and wrinkles, giving it the appearance of a casual shirt.

For comparison with the present invention, except that the polyethylene glycol used in this example is omitted,
A dress shirt for comparison was obtained by the same method as in this example. This shirt did not have puckering, fluff, or wrinkles in the seam, but it had a difficulty in dyeing, and compared with the method of the present invention using polyethylene glycol, the dyeing density was greatly reduced and the color was light. Only the hue of was obtained.

[0025]

EFFECTS OF THE INVENTION According to the method of the present invention, it is possible to obtain a dyed product in which the puckering, fluff and wrinkles in the seam portion are less likely to occur and the dyeing property is not a problem at all.

Claims (1)

[Claims] 1. A sewn product made of cellulose cloth containing 5 to 50% by weight of polyethylene glycol having a molecular weight of 400 to 20,000 is crosslinked with formaldehyde in a gas phase and then dyed. Dyeing method for sewn products.