CS259476B1 - Fabrics with warp lye creping and method of their production - Google Patents

Description

The invention relates to fabrics with a permanent crepe effect which can be obtained on fabrics or knitted fabrics by sodium hydroxide solution. The textiles contain cotton in some niece systems, synthetic fibers in the second system, or a mixed yarn of cotton and synthetic fibers. Polyamide or polyester is most commonly used as a synthetic material. .

The most common method of creping cotton fabrics is to utilize fiber shrinkage due to the local effect of highly concentrated alkaline lye. However, the permanence of the effects thus obtained, both in the wash and in the long-term mechanical stress, especially in the wet, is limited.

Also, cotton blends with synthetic fibers have a number of conventional treatments, and these fabrics and knitted fabrics are used for a variety of products. However, so far it has not been possible to create significant creping on knitted fabrics, which would be qualitatively comparable β by so-called caustic crepe on cotton fabrics. So far, only creping achieved mechanically on a calendering calender or on a special Bandura creping machine is known. In any case, the extent and depth of the crepe effect corresponding to the caustic creps known in 100% cotton fabrics was not achieved. These cotton liquor crepes are in demand on the market because of their plump character and are advantageously used in the clothing, bedding and other fields. Their production is economically advantageous.

It is an object of the invention to eliminate the aforementioned defects and to achieve a permanent and economically advantageous crepe treatment on knitted fabrics of a mixture of cotton and synthetic fibers. For this purpose, textiles are constructed which contain cotton in one thread system and synthetic fibers in the other, most often polyamide or polyester. Also, a blend of cotton with synthetic fibers may be used in both thread systems of the fabric, the synthetic fibers comprising fabrics of from 25 to 60% by weight. Also used is a fabric structure that imparts minimal resistance to the shrinkage forces of the cotton portion and allows maximum crepe effect.

This object has been achieved by a fabric made according to the invention, in which the warp is of cotton yarn, which may contain up to 40% by weight of polyester, polyamide, polypropylene fibers, with a fineness of 16.5 to 35.5 tex, preferably of 1500 to 3%. 200 threads per meter and a weft made of polyester, polyamide, polypropylene silk with a fineness of 5.6 to 11.0 tex, in addition 2,500 to 5,000 threads per meter. Alternatively, the weft is a polyester, polyamide, polypropylene yarn, which may contain up to 35% by weight of cotton. This yarn exhibits a fineness of 16.5 to 35.5 tex, a spacing of 1500 to 3000 threads per meter. The weave of such a fabric is plain or repetitive.

The process for preparing this fabric is characterized in that the pretreatment is carried out with a soda water at a concentration of 2 to 10 g / l with the addition of a detergent having a curing and scouring effect and bleaching is carried out with sodium hypochlorite at a concentration of 2 to 5 g / l at normal ambient temperature. Subsequently, the solution or paste containing sodium hydroxide is applied at a dose of 31 to 42% by weight. The fabric is then dried for 5 to 10 minutes in a loosely stacked state at a temperature of 40 to 70 ° C.

followed by resting for at least 10 minutes at normal ambient temperature.

Dewatering is performed by centrifugation and drying, including fixation and elimination of mechanical stress on the fabric in all directions.

The advantage of the two-component fabrics according to the invention is that, compared to pure cotton fabrics, their synthetic fraction is not subject to precipitation due to sodium hydroxide solution, so that by creping with lye there is not so much lateral shrinkage of the fabric as cotton fabrics during creping. This makes it possible to produce crepe from the knitted fabrics of the invention with the resultant.

width up to 140 cm, which is not possible in cotton fabrics with conventional textile drapery machinery, allowing fabrics to be fabricated before creping, up to a width of 160 cm. This width for fabrics is insufficient to achieve a final width of crepe of 140 cm due to the considerable transverse precipitation due to caustic soda. At the same time, reaching the final width of 140 cm is very important for the production of bedding and some decorative and other textiles.

The fabric of the invention is constructed using the following principles:

- the warp consists of cotton yarn or a cotton / synthetic fiber blend, such as polyester, polyamide or polypropylene, containing at least 60% by weight of cotton,

- synthetic woven fabrics of polyester, polyamide or polypropylene, or yarns of these fibers, or mixed yarns of cotton and synthetic polyester, polyamide, polypropylene, in which cotton is present up to 35% by weight, are used in the weft,

- a fabric structure is used which will assist as much as possible the differential precipitation of the strips wetted with sodium hydroxide solution as opposed to the surrounding, i.e., secondary strips not wetted with this lye, which creates optimal creping.

These are canvas and ryps and the following fabric parameters.

Range weight • 85 to 169 Range get an outline 1 500 to 3 200 Range get the weft 2 500 to 5 000 Greek silk ^ pro synteti 1 500 to 3 000 for yarn, [texj, Range Outline Outline 16.5 to 35.5 Range the fineness of the weft · ' 5.6 to 11 [tex], for silk Range the fineness of the weft 16.5 to 35.5 & ^ез 3>

for yarn.

When refining the fabric according to the invention, particular emphasis is placed on avoiding the loss or loss of the fabric. reduced shrinkage of the cotton portion prior to creping. This means that the action of strongly alkaline baths is excluded, instead of caustic soda, the soda is only made with soda, the dose of which does not exceed 3 g / l for the jig processing and 15 g / l for the continuous treatment.

Bleaching is carried out at elevated temperature in the case of PAD / b and sodium hypochlorite, the concentration of which does not exceed 2.5 g / l of active chlorine per jig and 6 g / l of active chlorine in continuous processing, in the case of PES / b commonly used.

The pretreated fabric is optionally dyed or printed by conventional means.

The actual creping is carried out in a known manner by printing or printing. by applying longitudinal or oblique strips, or by printing regularly spaced rectangles or similar geometric shapes, the printing paste containing sodium hydroxide in a dose of 31 to 42% by weight.

After application resp. tilting the caustic soda followed by 5 to 10 min. drying in a loosely stacked state in a mansard heated to 40 to 70 ° C and subsequent standing for at least 10 min. at normal ambient temperature. Following the rinsing and acidification in the usual way, it is advantageous in the last bath to soak the goods with a suitable touch and antistatic agent, for example Syntamin NI at a dose of up to 4 g / l.

Drainage is accomplished by centrifugation or decanting. The goods are further dried on a machine where longitudinal stresses and presses on the rolls are avoided as far as possible, i.e. drum dryers are excluded. Advantageously, the adjustment works as much as possible in advance;

The thermofixation is carried out under the same mechanical conditions as mentioned in the drying, the temperature regime is chosen according to the type of the synthetic fiber and the weight of the fabric, or the drying and fixing are preferably combined into one operation. Depending on the circumstances, thermofixation should be included before dyeing or printing or after creping. Due to the specific nature of the crepe product, the final thermofixation may be omitted.

The application by touch and antistatic or stabilizing effect of the finish can be realized by spraying device, so-called micro-loading before drying or fixation.

Example 1 woven woven fabric;

warp 10 tex x 2 cotton weft 6.7 tex PADh smooth gets gray 2 750/2 100 x 2 Qn ^] basis weight gray 0404 [gm ² ] basis weight adjusted 130 [cf.m ² ] binding ryps representation of components 54 ba / 46 PAĎh

The fabric is pretreated with soda and detergent, for example Syntapon AB, bleached with 5 g / l of active hypochlorite, thermofixed at 185 ° C, printed with reactive dyes and creped by applying sodium hydroxide at a concentration of 39 ° B in longitudinal strips 12 mm, with regular spacing of 6 mm between them.

Example 2

The fabric as in Example 1, wherein the thermofixation is omitted during its pretreatment.

Example 3 woven dresser:

warp weft receives raw basis weight raw basis weight modified weave canvas representation of components tex cotton tex PESh shaped

400/2 300. [Ль ¹ ]

100 [gm ² ]

122 [gm ² ]

7 * 1 ba / 29 PESh

The fabrics were pretreated with hot-dipping and peroxide bleaching, stained with disperse and cuprophemyl dyes, and subjected to creping under the conditions of Example 1.

Example 4

Bedding knitted

warp 29>, 5 cotton escape 6.7 PADh smooth

getting dun basis weight raw basis weight adjusted bond ryps representation of components 2 500/2 200 x 2118 (gm ² ) 146 [gm 62 ba / 38 PADh

This fabric is preconditioned, printed and creped as described in Example 1 or 2.

Example 5

Woven bedding:

warp 16,5 tex cotton escape 20 tex 65 PES / 35 ba getting dun basis weight gray basis weight adjusted weave canvas representation of components 2 700/2 300 105 130 [g.m 66 ba / 33 PESs

This fabric is pretreated, dyed and creped as described in Example 3.

Claims (2)

.1. Fabrics with warp lye creping, in particular knitted fabric, consisting of a mixed two-component material, comprising cotton fibers in one thread system of the fabric and synthetic fibers in another thread system of the fabric, or a mixed yarn of cotton and synthetic fibers. containing, optionally, a proportion of polyester, polyamide, polypropylene fibers of up to 40% by weight, with a fineness of 16.5 to 35.5 tex and additionally 1 500 to 3 200 threads per meter, the weft being polyester, polyamide, polypropylene silk of fineness 5 , 6 to 11 tex and, in addition, 2,500 to 5,000 yarns per meter or polyester, polyamide, polypropylene yarns, optionally containing up to 35% by weight of cotton, with a fineness of 16.5 to 35.5 tex and a total of 1 500 up to 3 000 threads per meter, whose weave is linen or rep. 2. A method for producing a warp-lime crepe fabric according to item 1, comprising sizing or washing the wash, scrubbing or bleaching, creping itself, drying, fabric lay-off, flushing, acidification and optionally fabric softening and antistatic agents, further dewatering , drying and thermofixation, characterized in that in the pretreatment, the brewing is carried out with soda at a concentration of 2 to 10 g / l with the addition of a detergent having a curing and washing effect and bleaching with sodium hypochlorite at a concentration of 2 to 5 g / l at normal ambient temperature; followed by the application of a solution or paste containing sodium hydroxide in a dose of 31 to 42% by weight, drying for 5 to 10 minutes in a loosely stacked state at a temperature of 40 to 70 ° C followed by resting for at least 10 minutes at normal ambient temperature; is performed by centrifugation and drying, including fixation, avoiding mechanical stress on the fabric in all directions.