JP3222320B2 - Scouring and bleaching of natural fiber pile knitted fabric - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of continuously scouring and bleaching a knitted fabric of natural fibers such as cotton and wool knitted by a double Russell knitting machine.

[0002]

2. Description of the Related Art Blankets are indispensable as hanging bedding in Western European bed styles, and are becoming widespread in Japan with the westernization of lifestyle. Blankets often come into direct contact with the human body, require heat retention and moisture absorption, require high heat retention and moisture absorption, and also require a soft feel. In recent years, the production of cotton blankets has been growing rapidly due to its good feel and good washability. Traditionally, to manufacture cotton blankets,
Although a method of using a tufting machine to implant a cotton yarn in a cotton base fabric in a pile form has been common, there is room for improvement in the production efficiency and feel of a cotton tuft blanket.

On the other hand, a method of using a pile knitted fabric knitted by a double Russell knitting machine manufactured by KARL MAYER CORPORATION in Germany has been applied to the production of an acrylic blanket, and high production efficiency and high feel are maintained. When this method is applied to the production of cotton blankets, the knitted double knitted fabric is first cut center from the center of the pile with a knife to divide the knitted fabric into two knitted fabrics, and then each of the knitted fabrics or a jet dyeing machine is used. It is necessary to perform scouring and bleaching.

[0004]

However, when a single-sided pile knitted fabric obtained by center-cutting a double knitted fabric is subjected to scouring and bleaching with a liquid jet dyeing machine, the amount of chemicals and water used becomes relatively large, resulting in cost reduction. In addition, the knitted fabric is scoured and bleached while being wrapped in a rope shape, and tends to be spotted. The remaining rope marks lower the quality of the knitted fabric and cause defective products. A large amount of short fibers fall from the pile cut by the center cut during the scouring and bleaching process, which greatly deteriorates the environment for the scouring and bleaching operation and reduces the efficiency due to clogging of the filter. These short fibers flow into wastewater and degrade water treatment conditions.

[0005] The present invention provides a natural fiber in which the double knitted fabric before the center cut is subjected to scouring and bleaching to use a relatively small amount of chemicals, water and the like, and does not generate defective products bleached in spots. It is intended to provide a scouring and bleaching method for pile knitted fabric. Another object of the present invention is to provide a scouring and bleaching method for a natural fiber pile knitted fabric in which the production efficiency of a knitted fabric is significantly improved by performing a center cut after scouring and bleaching a double knitted fabric. .

[0006]

SUMMARY OF THE INVENTION The present invention relates to a double knitted fabric 1 knitted by a double Russell knitting machine 24 (FIG. 5) for scouring and bleaching a pile knitted fabric of natural fibers such as cotton and wool.
(FIG. 1) is used as it is. The double knitted fabric 1 is passed through a dipping tank 16 containing a solution of a scouring agent and a bleaching agent, squeezed by roll padders 17 and 17 in a vat bleaching apparatus 4 of FIG. To promote.

[0007] Thereafter, the double knitted fabric 1 is sequentially washed with a plurality of washing machines 19 set at a gradually lower water temperature to be washed with water. It is preferable that the washing machine 19 arranges, for example, six tanks in series, and sets the temperature of the hot water of each washing machine to gradually lower from about 80 ° C. to 40 ° C.

The washed double knitted fabric 1 is dried by circulating in a hot air chamber 22 after dehydration treatment. Generally, the dimensions of the pin tenter dryer 21 (FIG. 4) are stabilized. Finally, as shown in FIG. 6, the pile of the scoured and bleached double knitted fabric 1 is cut at the center.

[0009]

According to the method of the present invention, since the double knitted fabric 1 is scoured and bleached in a spread state, bleaching does not become uneven, and no defective products due to residual rope marks are generated. In the method of the present invention, the double knitted fabric 1 is subjected to scouring bleaching, washing, and softening treatment, and then is stretched by drying while being strained in the width direction.

In the method of the present invention, the double knitted fabric 1 is continuously scoured and bleached using the vat bleaching device 4,
The amount of water, scouring agent and bleaching agent used can be reduced, and the production efficiency is dramatically improved. For example, according to the conventional method using a jet dyeing machine, a double knitted fabric is batch-processed by 7 times.
After 50m bleaching, the preparatory process (30min.
), Scouring and bleaching process (heating of the solution of scouring bleach at 60 ° C for 20 minutes, scouring and bleaching at 60 ° C for 20 minutes, saturated steam of 8 minutes)
Heating at 0 ° C and 90 ° C for 20 minutes and steaming at 80 ° C for 40 minutes
, 40 minutes for steaming at 90 ° C, 10 minutes for drainage of scouring bleach), washing process (20 minutes at 70 ° C heating of water, 70 minutes)
(For example, 20 minutes for the washing process at 10 ° C. and 10 minutes for the draining process of the washing water), which requires 230 minutes in total.
000 liters, all of which can be reduced to less than half according to the method of the invention.

[0011]

Next, the present invention will be described with reference to examples. The double knitted fabric 1 used in the method of the present invention is usually knitted by a Karl Meyer double raschel machine. As illustrated in FIG. 5, the double knitted fabric 1 used in the method of the present invention includes two latch needles 25, 25 in a double Russell machine 24.
, Five guides 26 are arranged, and a large number of guides 26 are arranged in a length corresponding to the width of the carpet toward the paper surface direction of FIG. Then, the base fabric 27 is knitted by cotton filament yarn independently by the front and rear two guides 26a, and the front and rear base fabrics 27 are connected by the cotton pile yarn.

The base fabric 27 in the knitted double knitted fabric 1
Although not shown, a vertical knitted fabric having a predetermined width is constituted by a vertical knitted fabric having a complicated stitch structure, and a horizontal insertion yarn laying in a stitch of each vertical knitting yarn. In the double knitted fabric 1, the individual stitches are strongly tightened so that the cotton pile yarn 28 is firmly held by the base fabrics 27, 27. Ground 1
When the scouring and bleaching process is performed with both side edges of the knitted fabric free, the entire knitted fabric is wound around a rope.

In order to scour and bleach the double knitted fabric 1 in a spread state, the double knitted fabric 1 is temporarily held in the square 15 in FIG. And a sewing machine (not shown) to enable continuous running. The double knitted fabric 1 in the square 15 has a feed roller 3
, And passed through an immersion tank 16 containing a solution of scouring agent and bleaching agent, and then squeezed by roll pads 17, 17 of rubber mangles.

An example of the preparation of the scouring agent and the bleach color paste used in the vat bleaching apparatus 4 is as follows. The composition of 1000 liters of the pad solution is, for example, 30 liters of 35% hydrogen peroxide, 8 kg of caustic soda (flake), and Tripon A-7.
4 (product name) 3 kg, TRIPON BA-44 (product name)
Add 3 kg and dilute with water. The pad conditions are:
The mangle pressure of the roll padder 17, 17 is 1.0 kg /
cm ² .

The double knitted fabric 1 has a steamer 1 after scouring and bleaching.
8 and suspended in a loop on a hanging bar 5 connected to a conveyor chain in the steamer, and steamed with saturated steam at 98-100 ° C. for 12-15 minutes. At this time, the double knitted fabric 1 rapidly reaches the atmospheric temperature in the steamer 18, and the reaction proceeds in a short time.

The steam-heat treated double knitted fabric 1 is a steamer 1
8 and then sequentially pass through six washing machines 19 to wash with water. In the washing machine 19, a rubber-stainless steel squeezing roll is rotatably installed for each tank,
The washing effect is improved by repeatedly replacing the knitted fabric with water. The tank temperature of the washing machine 19 is 85 to 85 in the first tank and the second tank.
90 ° C., 70 ° C. in the third tank, and 40 ° C. in the fourth to sixth tanks. As a result, the impurities of the cotton pile yarn reacted in the steamer are separated and removed from the double knitted fabric 1, and the excess chemical used in the scouring and bleaching step is efficiently removed.

As shown in FIG. 4, the double-knitted fabric 1 washed with water is transported in the air for an appropriate time, and then washed again with the washing tank 42.
And sent to the splat jet 6. Splat Jet 6
, The lower rubber roller 43 and one metal roller 44
, And is fed into the flexible tank 46 while being squeezed by the other metal roller 45. A softener (trade name:
20 g / l of silicolane 520) is added, and a plurality of mangles 47 repeatedly enter and exit the flexible tank 46. The double knitted fabric 1 that has exited the flexible tank 46 is squeezed by the upper rubber roller 48 and the other metal roller 45,
And send it out while squeezing. It is preferable that compressed air is injected into a space formed by the rubber rollers 43 and 48 and the metal rollers 44 and 45 by a compressor (not shown), and the squeezing effect is enhanced by continuous blowing of the air.

The softened double knitted fabric 1 corrects the skew of the texture and the curvature of the texture by using a pair 62 of oblique rollers and curved rollers (FIG. 3). Thereafter, in the pin tenter dryer 21 (FIG. 4), the both sides of the double knitted fabric 1 are gripped by the tenter clips 63 and widened, while the hot air chamber 22 is circulated and dried to stabilize the dimensions. The pin tenter dryer 21 has an in-machine temperature of 8 chambers and 2 chambers and a cloth speed of 10 to 2.
It is 0 m / min and the hot air temperature is 120 to 130 ° C. Even if this hot air is blown from both the upper and lower surfaces of the double knitted fabric 1, the pile yarn is hardly affected by the temperature and the wind speed.

As described above, the scoured and bleached double knitted fabric 1
As shown in FIG. 6, is sent to a knife cutting device 30 and is center-cut by an endless band knife 32 to form two single-sided pile knitted fabrics 2. As a result, even when scouring and bleaching and finishing are performed to produce a cotton pile knitted fabric, a good working environment can be maintained without short fibers falling off the pile during scouring and bleaching.

[0020]

According to the method of the present invention, the double knitted fabric is subjected to continuous scouring and bleaching and then center-cut to reduce the amount of water, scouring agent and bleaching agent, leading to cost reduction. Moreover, the production efficiency is dramatically improved. According to the scouring and bleaching method of the present invention, since the double knitted fabric is scoured and bleached in a spread state, the double knitted fabric is not bleached to spots, the occurrence of defective products is reduced, and the quality of the natural fiber pile knitted fabric is improved.

In the method of the present invention, a short scouring and bleaching operation environment can be maintained without any short fibers from falling off the pile and contaminating the scouring and bleaching apparatus and the splat jet. The scoured and bleached double knitted fabric can be easily cut at the center because the pile fibers are flexible, so that the center cutting speed can be increased and no cut unevenness occurs.

[Brief description of the drawings]

FIG. 1 is an enlarged partial cross-sectional view of a double knitted fabric subjected to scouring and bleaching treatment by the method of the present invention.

FIG. 2 is a schematic side view showing a vat bleaching apparatus, a steamer, and a washing machine used in a scouring bleaching process.

FIG. 3 is a schematic plan view showing a set of diagonal rollers for correcting the skew of the texture and the curvature of the texture.

FIG. 4 is a schematic sectional view showing a splat jet and a pin tenter dryer.

FIG. 5 is a schematic side view showing a main part of a double Russell machine for knitting a double knitted fabric.

FIG. 6 is a schematic sectional view showing a knife cutting device for center cutting a double knitted fabric.

[Explanation of symbols]

 Reference Signs List 1 double knitted fabric 2 single-sided pile knitted fabric 4 bat bleaching device 17 roll padder 18 steamer 19 washing machine 22 hot air chamber

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) D06L 1/00-3/16 D06B 1/00-23/30 D06C 3/00-29/00

Claims (3)

(57) [Claims] 1. A scouring agent for knitted fabric of natural fibers such as cotton and wool.
In a scouring and bleaching method for pile knitted fabric that is immersed in a bleach solution and then washed and dewatered and then dried, the double knitted fabric knitted from natural fibers such as cotton and wool is scoured and bleached in an expanded form
To be held in the square,
When the anti-butt of the previous double knitted fabric was seen, the next double knitted fabric was
The double knitted fabric is passed through a dipping tank containing a solution of a scouring agent or a bleaching agent, and then squeezed with a roll padder, and then reacted with saturated steam in a steamer. It washed sequentially passed through multiple washing machine after accelerated and then by circulating hot air chamber after dehydrated and dried and finally the natural fiber pile knitted fabric that center cut double knitted fabric of the pile Scouring bleaching method. 2. A scouring agent for knitting natural fibers such as cotton and wool.
Or after immersion in a bleach solution and after washing and dehydration
In scouring and bleaching of pile fabrics that dry, cotton and wool
Double knitted fabric knitted from any natural fiber
After passing through the dip tank containing the bleach solution,
And then squeezed by saturated steam in the steamer.
After washing, pass through multiple washing machines sequentially to wash with water
Then, after dehydration treatment, the oblique roller and the curved roller
Correct the texture skew and the curvature of the texture with the
In the inter dryer, both ends of the double knitted fabric are tentered.
Circulate the hot air chamber while holding it wide with clips and dry it.
Dry and finally cut the double knitted fabric center
A scouring and bleaching method for knitted fiber pile knitted fabric . 3. A softening treatment is performed during the dehydration treatment ,
Do not squeeze the double knitted fabric from the soft tank with a rubber roller and a metal roller.
Rolled out, formed with each rubber roller and metal roller
By injecting compressed air into the space, the continuous air
3. The squeezing effect is enhanced by a special blowing.
The scouring bleaching method described.