JPH0919393A - Wiping cloth consisting of high-density knitted fabric and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide wiping cloth which is soft, has excellent dimensional stability, is free from fraying and has a good wiping property by using large-fineness fibers of specific fineness as the inner layer part of a knitted fabric and exposing extremely fine fibers on the front layer part so as to have blisters, thereby entanglivy both fibers to each other. SOLUTION: The polyester high-density knitted fabric is composed of the composite yarn consisting of the extremely fine synthetic fibers temporally twisted mainly to single fiber fineness of <=0.1 denier and the large-fineness synthetic fibers of single fiber fineness of >=1. The relatively inner layer part of the knitted fabric is formed of the large-fines fibers and the extremely fine fibers are exposed in the relatively front layer part of the knitted fabric so as to have the blisters. Both fibers are interlinked with each other. The combining ratio is preferably 60 to 70wt.% in terms of bulkiness, hand and wiping property. The extremely fine fibers are preferably longer by >=3% than the large-fineness fibers. The extremely fine fibers of low shrinkage subjected to temporally twisting and the large-fineness fibers of high shrinkage are subjected to a fluid entangling treatment and, therefore, the extremely fine fibers are exposed on the front surface by having the blisters and the soft hand is obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiping cloth made of a high-density knitted fabric having a high contaminant wiping property or a high adsorption action, and a method for producing the same.

[0002]

2. Description of the Related Art With the rapid progress of the electronic information society, a wiping cloth having a high contaminant removal performance is required for cleaning not only conventional glasses and lenses but also the screens of electronic devices represented by liquid crystal screens. It Conventional cotton and paper cannot be used as a wiping cloth in the field where fluff and dust are disliked.

In recent years, a cloth using ultrafine fibers has been proposed as a wiping cloth. For example, a wiping cloth characterized by the bulkiness of a fabric made of ultrafine fibers of 0.9 denier or less is proposed in JP-A-61-103428, and ultrafine yarn of 0.2 denier or less and 0.5 to 10 An entangled knitted woven fabric made of denier fibers and a method for producing the same have been proposed in JP-A-63-212364.

However, these woven fabrics have the drawbacks that not only the texture is hard, but also they are too slippery with respect to the material using glass as the substrate, and conversely, they are not slippery and the wiping workability is poor. In addition, the knitted fabric has a drawback that it is deformed due to the elasticity of the knitted fabric or deformed after being stretched, which is called laughter. There were also problems such as excessive slippage and insufficient wipeability due to the roughness of the stitches.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to improve the above-mentioned drawbacks and to make a polyester-based knitted fabric having a soft texture, excellent dimensional stability, no frayed cutting surface, and wiping. It is an object of the present invention to provide a wiping cloth made of a high-density knitted fabric having good take-off property and wiping workability, and a manufacturing method thereof.

[0006]

The present invention has the following constitution in order to solve the above problems. That is, the polyester high-density knitted fabric is mainly composed of a composite yarn composed of a temporary twisted ultrafine synthetic fiber having a single yarn fineness of 0.1 denier or less and a thick fine synthetic fiber having a single yarn fineness of 1 denier or more,
The high-fineness fibers relatively form the inner layer portion of the knitted fabric, and the ultrafine fibers appear relatively with a bulge on the surface layer portion of the knitted fabric, and these two fibers form entanglement with each other. This is a wiping cloth made of a high-density knitted fabric.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail.

The material constituting the wiping cloth of the present invention is composed of ultrafine synthetic fibers which are temporarily twisted and have a fineness of single yarn of 0.1 denier or less, and synthetic fibers of large fineness of 1 denier or more.

The above ultrafine synthetic fibers and large fineness synthetic fibers are
It is preferably made of polyester, but other synthetic fibers such as polyamide may be used. When both the ultrafine synthetic fiber and the large fineness synthetic fiber are polyester, there is no problem even if the polyamide or carbon fiber is contained in a small amount within 10%. The fineness of the ultrafine fibers is 0.1 denier or less, preferably 0.01 to 0.08 denier. Furthermore, 0.05-0.
It is more preferably in the range of 06 denier. The fineness of the fiber is 1 denier or more, preferably 2 to 4 denier.

When the fineness fiber is less than 1 denier,
The knit will consist of only fine fibers,
It does not feel stiff, lacks dimensional stability, and expresses a "laugh" peculiar to knitwear.

In the present invention, the composite ratio of the ultrafine fibers and the fineness fibers is important, and it is preferable that the ultrafine fibers are contained at least in a larger amount than the fineness fibers. From the viewpoint of the bulkiness, texture, and wipeability of the fabric, the ultrafine fibers are 50-
80% by weight is preferable, and further 60%
It is more preferable that the content is up to 70% by weight.

Basically, fibers having a fineness of 1 denier or more occupy the remaining portion. However, it does not matter if antistatic fibers such as carbon fibers are included as needed.
Fibers with a fineness of 1 denier or more are preferably raw silk that has not been temporarily twisted.

Further, it has a shrinkage property higher than that of the ultrafine fibers before the heat treatment. The shrinkage ratio is not particularly limited, but what is important is that the shrinkage property with respect to heat is greater than that of the ultrafine fibers. It is preferable that the fine fiber has a shrinkage of 10 to 25%, while the ultrafine fiber has a shrinkage of 4 to 8% in boiling water. In particular, those having a shrinkage ratio that is 4 to 8% higher than the boiling water shrinkage ratio of the ultrafine fibers are more preferable. That is, the heat treatment such as dyeing causes the large fineness fibers to contract more than the ultrafine fibers to form the inside of the fiber bundle of the knit structure.
Due to this difference in shrinkage, after the heat treatment, the fibers of large fineness relatively form the inner layer part of the yarn (the inner layer part of the knit), and the ultrafine fibers relatively form the surface part of the yarn (the surface layer part of the knit). Will be done. The difference in yarn length between the two is preferably such that the ultrafine fibers are 3% or more longer than the large fineness fibers.

On the other hand, the ultrafine fibers are crimped by temporary twisting. This temporary twist shrinkage disturbs the single fiber array one by one, increasing the bulkiness of the surface of the knitted fabric.

In the present invention, the low-shrink ultrafine fibers and the high-shrink high-fineness fibers that have been temporarily twisted as described above are subjected to a fluid entanglement treatment, and both are entangled with each other to be compositely integrated. Since this composite yarn is integrated by entanglement without being twisted, after shrinkage treatment, ultrafine fibers appear with a bulge on the surface and the texture becomes extremely soft.

The density of the knitted fabric is a well mainly composed of ultrafine fibers,
It is preferable that the course has a high density of 25,000 lines / in or more. More preferably 30,000 to 50,000 lines / in
And the density of. For example, 60/80 denier composite yarn consisting of 650 filament ultrafine fibers and large fineness fibers
If the density is in, it is considered that the fiber is composed of 39000 filaments / in. Here, if it is less than 25,000 yarns / in, the knitted fabric will be soft and firm, and the wipeability will be poor. From the standpoint of wiping-off, the greater the number of fibers, the better, but the texture,
There is no infinitely high density in terms of wiping workability and the degree of clearance between threads.

Further, the disorder of the arrangement of the single fibers constituting the knitted fabric may result in a wiping cloth having no directionality in wiping property. This arrangement disorder does not necessarily occur, but can be obtained by subjecting the surface of the knitted fabric to water jet processing. By water jetting the surface of the knitted fabric, the single fibers constituting the knitting yarn are disturbed, a part of the ultrafine fibers on the surface are intertwined with the large fineness fibers toward the inside of the yarn, and the directionality of the stitches is further randomized, Densitometer: The knitting density becomes unreadable or very difficult to read with a urnometer, and the surface of the knitted fabric changes to a chamois.

The wiping cloth of the present invention has good dimensional stability despite the knitted fabric. That is, the shrinkage ratio by dry heat treatment at 160 ° C. is 5% or less, and the dimensional change by washing is 5% or less. Both are preferably 3% or less.

The dimensional change due to the dry heat treatment at 160 ° C. was measured according to JIS L1042 “Test method for shrinkage rate of woven fabric. However, the dry heat treatment temperature and time were 160 ° C. × 3.
And was hung vertically in a hot air dryer.

The washing treatment was carried out by the method described in JIS L0217, 40 ° C. × 25 minutes and 10 minutes of rinsing.

Although the knitted fabric has a large dimensional change due to heat, and it has been difficult to suppress the dimensional change to 5% or less, the knitted fabric of the present invention has a dimensional change of 5% due to dry heat treatment at 160 ° C. and a wash. By using the following knitted fabric and by being entangled with each other, it is possible to obtain a wiping cloth made of a polyester knitted fabric that is excellent in dimensional stability and has a non-frayed cut surface.

For the quality of the wiping cloth, not only the dirt wiping performance but also the wiping workability is important. The wiping performance and the wiping workability are related to the friction resistance between the plate glass and the wiping cloth. The wiping cloth of the present invention has a frictional resistance between the present wiping cloth and a glass plate under a load of 1 kg / 35 cm ^{2 in} the range of 400 to 900 g. The wiping cloth was excellent in workability.

The frictional resistance was measured by the following measuring method.

Weight of 1 kg when the area of the circular part is 35 cm ^2.
Using the cylindrical body of, the wiping cloth cut slightly larger than the area of the circular portion of the cylindrical body is brought into close contact with the circular portion of the cylindrical body, and the surplus portion is aligned with the cylindrical portion of the cylindrical body. Is fitted into the cylindrical body, and the surplus portion of the wiping cloth along the tubular portion is fixed with a rubber band. Then, the wiping cloth attached to the above-mentioned cylinder is moved on a normal plate glass at a speed of 10 cm / min, and its resistance value is measured by using a U gauge.

It has also been found that the wiping cloth of the present invention largely depends on the wiping property of the thickness of the cloth, and that the wiping cloth having a thickness of 0.4 to 0.8 mm has excellent wiping property and handling. In particular, those having a thickness of 0.5 to 0.7 mm are preferable. 0.4
If it is less than mm, dirt cannot be sufficiently absorbed, and if it exceeds 0.8 mm, handling property becomes poor.

The thickness was measured using a dial gauge (Peacock meter) with a load of 7 g / cm ² .

Further, the wiping cloth of the present invention has a strong affinity for hydrophobic dirt and has an action of selectively adsorbing the dirt of the washing liquid at the time of washing. If added, it also has the effect of preventing darkening of synthetic fibers.

Next, an example of the method for manufacturing the wiping cloth of the present invention will be described.

The wiping cloth of the present invention comprises a temporary shrinkage yarn (A) of a low shrinkage polyester composite fiber filament having a sea-island structure having an island component of 0.1 denier or less and a high shrinkage polyester raw yarn of a high fineness fiber ( B) is aligned and the knitted fabric in which the interlock method is knitted by the circular knitting machine with the composite yarn entangled with the air nozzle is used as a raw material, and this raw material is subjected to hot water treatment to remove sea components. By removing this sea component, ultrafine fibers having a denier of 0.1 or less can be obtained. Treatment in the presence of alkali is effective for removing sea components, and sodium hydroxide is usually used.

It is also possible to use peelable split fibers instead of the sea-island structure composite fibers. For the temporary twisting, ordinary Woolly processing or the like can be used.

Any method may be used to make the knit, but the circular knitting interlock method is effective in terms of productivity and prevention of fraying in cutting.

The method of entwining the ultrafine fibers is achieved by the fluid entanglement of the temporary twisted ultrafine fibers of the present invention and the high shrinkage raw silk, and the entanglement is further promoted by the water jet processing.

The fine-definition, highly-shrinkable yarn is subjected to shrinkage treatment by heat treatment such as dyeing to float up the ultrafine fibers, and further the water pressure of the water jet process causes shrinkage of 1 to 3%, and at the same time, the single fibers constituting the knitting yarn are formed. Disturbance causes a part of the ultrafine fibers on the surface to be entangled with the high-definition fibers toward the inside of the yarn, and the directionality of the stitches becomes random, making it difficult to see.

That is, after dyeing the fabric after sea removal, 5
By injecting a fluid of 0 to 100 kg / cm ² from the small holes onto the surface of the cloth, the ultrafine fibers are separated from each other almost one by one, and the ultrafine fibers have a form in which they float on the surface of the cloth. The reason why the ultrafine fibers are selectively raised on the surface of the fabric is due to the action of the fineness fiber having a larger shrinkage ratio than the ultrafine fibers. That is, by water jet processing, the fibers are disturbed in the arrangement and become random arrangement, the high shrinkage yarn having a large single fiber fineness selectively forms the inner layer portion, and the ultrafine fiber having a small single fiber fineness forms the surface layer portion. The wiping cloth can be formed to have a bulge.

The dyeing is carried out by the usual dyeing methods for polyester. That is, with a disperse dye, 120 to 135
High-temperature dyeing at ℃ is applied, and the rate of temperature rise is preferably 0.5 to 2 ° C / min from the viewpoint of dyeing property of the ultrafine yarn. The water jet processed fabric is dried and finished set. If necessary, an antistatic treatment or a water absorption treatment does not affect the wiping property and does not cause any problem.

In the present invention, even in circular knitting, the cut surface is less likely to be frayed due to the shrinking action of the high shrinkage yarn and the entanglement by the fluid entanglement treatment and the water jet processing. The high-density polyester knitted fabric of the present invention has an unprecedentedly excellent wiping property as a wiping cloth, and is an oil film for glasses, lenses, liquid crystal materials, electronic information materials, devices, pearls, jewelry, automobile windows, etc. It is possible to wipe off dirt etc. with high precision.

The wiping property was evaluated by the following method. Silicone oil SH200 (manufactured by Toray Dow Corning Silicone Co., Ltd.) was dropped by an injection needle on a glass plate of about 5 mg, and a cylindrical load having a diameter of 45 mm and a weight of 1 kg was applied to one end face of a cloth having a thickness of about 1 mm. Fixed sample (wiping cloth)
Is placed on a glass plate and moved at a speed of 1 m / min to wipe off the silicone. Next, a toner for a dry copying machine (SF-76)
T (manufactured by Sharp Corp.) is sprinkled on a glass plate, and the toner is blown off with compressed air (1 kg / cm ² ). A cellophane tape manufactured by Sekisui Chemical Co., Ltd. is attached to the surface of the glass plate to remove the residual toner on the glass plate, and the degree of the toner attached to the cellophane tape is determined. It was visually evaluated on a scale of 5 on the scale that no toner adhered (completely wiped off the glass plate of silicone) was grade 5, and that on which a very large amount of toner remained was grade 1. The wiping workability, texture, and degree of laughter were sensory evaluated.

[0038]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on embodiments.

Example 1 Ultrafine fibers were 50 denier 9 filaments, [70 islands / filament: manufactured by Toray Co., Ltd.] sea-island type polyester, whose island component was polyethylene terephthalate and whose sea component was polyester terephthalic acid and 5 sodium. Fibers (sea-island ratio of 10/90) made of alkali hot water-soluble polyester made of a sulfoisophthalic acid copolymer were used. The boiling water shrinkage of this yarn was 5.8%. As the high shrink raw silk, a polyester yarn of 30 denier 12 filaments [manufactured by Toray Industries, Inc.] was used. The shrinkage of this thread is 1
3.8%. On the other hand, ultrafine fibers are temporarily twisted without de-sealing (temporary twist number: 3000 T / M, temperature: 180
C.), aligned with the high shrinkage raw yarn, and air-entangled (overfeed rate of ultrafine yarn: 2%, air pressure: 3 kg / cm ² ) to obtain a composite yarn. Further, a circular knitting machine 32G, 36 inches) was used to knit in an interlock system to obtain a raw machine. The raw material was once heat-treated at 130 ° C. for 20 minutes and then further treated at 80 ° C. for 30 minutes in the presence of 1% sodium hydroxide to completely remove sea components. Next, it was dyed by a usual method and subjected to water jet processing from the surface under a pressure of 100 Kg / cm ² . After that, heat setting was performed at 130 ° C., and the number of wells and courses was set to 60 / in. The ratio of the ultrafine fibers of the obtained knitted fabric was 65% by weight, and the number of single fibers composed mainly of the ultrafine fibers was a high density knitted fabric having a well course of about 35,000 filaments / in or more. The basis weight is 210 g / m ² , and the width is 6 against the raw fabric.
Shrinked to 8%, length: 72%. However, the product 160
It was a wiping cloth having a dimensional stability with a dry heat shrinkage at 1.6 ° C. of 1.6% and a washing shrinkage of 2% or less.

FIG. 1 is a SEM photograph of the surface of the knitted fabric after the water jet processing in the above embodiment, and FIG. 2 is a SEM photograph of the surface of the knitted fabric after the dyeing in the above embodiment and before the water jet processing. As shown in FIG. 1, the appearance of the wiping cloth of the present invention lost the structure of the knitted fabric and was as if it was chamois, and the texture was supple. There was no laughter due to stretching.

Comparative Example 1 A knitted fabric made of the same composite yarn as in Example 1 was prepared by the same method up to dyeing and finished without water jet processing. The texture was supple and rich in elasticity, but it had a lot of laughter and lacked dimensional stability.

Comparative Example 2 The same sea-island type polyester as in Example 1 was processed in the same manner as in Example 1 using a yarn that was aligned with the high shrinkage raw yarn without temporary twisting. The basis weight of the obtained knit is 195 g / m ² ,
The appearance was chamois, but the laughter was large due to the lack of elasticity and a slight lack of elasticity.

Comparative Example 3 The same method as in Example 1 was carried out using only the yarn obtained by aligning two high shrinkage yarns with Example 1 alone. The knit obtained was hard and lacked in flexibility.

Comparative Example 4 A plain weave fabric (unit weight: 230 g / cm ² ) composed of the same composite yarn of sea-island type polyester and high shrinkage yarn as in Example 1 was prepared,
A wiping cloth was manufactured as a trial under the same conditions as in Example 1 below.
The texture was hard and the wiping workability was poor, and it was unsatisfactory as a wiping cloth. Table 1 shows the wiping properties and fabric characteristics of Example 1 and Comparative Examples 1 to 4.

[0045]

[Table 1] The cloth of Example 1 had excellent wiping properties / wiping workability / texture and had no laughter. In Comparative Example 1, since the water jet processing was not performed, the shrinkage of the fiber was not sufficient, and the fineness of the ultrafine yarn was poor. Comparative Example 2 lacked entanglement between single fibers, had little feeling of volume, and had drawbacks in wiping workability and laughter. In Comparative Example 3, the high shrinkage yarn alone has a large single yarn fineness and poor wiping property. Comparative Example 4 has the same raw yarn used but has a woven structure, so that the wiping workability is poor and the texture is hard.

Example 2 Ultrafine fibers are 100 denier 18 filaments [70 islands /
Filament: manufactured by Toray Industries, Inc.] Sea-island type polyester, the island component is polyethylene terephthalate, and the sea component is an alkali hot water-soluble polyester composed of a copolymer of terephthalic acid and 5 sodium sulfoisophthalic acid as the acid component of the polyester. Fiber (sea island ratio is 10/90)
Was used. As the high shrink raw silk, a polyester yarn of 30 denier 12 filaments [manufactured by Toray Industries, Inc.] was used. The following processing was performed in the same manner as in Example 1. However, the product well and course were set to 38 / in, respectively. The resulting knitted fabric had a basis weight of 238 g / m ² , the appearance was chamois and the texture was supple. There was no laughter due to stretching.

Comparative Example 5 Ultrafine fiber 50 denier 9 filaments [70 islands / filament: manufactured by Toray Industries, Inc.] Sea-island type polyester with island component polyethylene terephthalate and sea component polyester with terephthalic acid and 5 sodium sulfoisophthalate as acid components A plain weave made of fibers (sea island ratio of 10/90) made of an alkali hot water-soluble polyester made of an acid copolymer was desalted by the method of Example 1 and dyed and water jet processed. The resulting fabric has a basis weight of 80 g / m ^2.
It was a thin dough.

The performance of the knitted fabric obtained in Example 2 and the woven fabric obtained in Comparative Example 5 as a wiping cloth was investigated and shown in Table 2.

The product of Example 2 had a high wiping property and a feeling of volume, and the wiping workability was also good. On the other hand, Comparative Example 5
The woven fabric of No. 3 had good wiping properties, but had a small thickness and lacked in volume feeling, and was insufficient in terms of wiping capacity.

[0050]

[Table 2]

[0051]

EFFECTS OF THE INVENTION The wiping cloth made of the high-density polyester knitted fabric of the present invention is a knitted fabric, but it is excellent in dimensional stability, is hard to be frayed from the cut surface, and the ultrafine yarn appears with a bulge on the surface of the knitted fabric. In addition, it has the effects of having a soft texture, an appropriate volume feeling, friction resistance, and excellent wiping performance / wiping workability.

[Brief description of the drawings]

FIG. 1 is a SEM photograph of a surface of a knitted fabric after water jet processing in Example 1 of the present invention.

FIG. 2 is a SEM photograph of a surface of a knitted fabric after dyeing and before water jet processing in Example 1 of the present invention.

Claims (11)

[Claims] 1. A high-density knitted fabric mainly composed of a composite yarn composed of a temporary twisted ultrafine synthetic fiber having a fineness of 0.1 denier or less and a synthetic fine fiber having a fineness of 1 denier or more, The high-fineness fibers relatively form the inner layer portion of the knitted fabric, and the ultrafine fibers appear relatively with a bulge on the surface layer portion of the knitted fabric, and these two fibers form entanglement with each other. A wiping cloth made of high-density knitted fabric. 2. The wiping cloth made of a high-density knitted fabric according to claim 1, wherein the knitted fabric surface layer portion has a disordered arrangement of ultrafine single fibers to the extent that the stitches cannot be seen. 3. A monofilament containing at least 50 to 80% by weight of ultrafine fibers and mainly composed of the ultrafine fibers is used for both the well and the course.
The wiping cloth made of the high-density knitted fabric according to claim 1 or 2, wherein the wiping cloth is composed of 5,000 or more yarns / in. 4. A wiping cloth made of a high-density knitted fabric according to any one of claims 1 to 3, wherein the ultrafine fibers have a yarn length difference of 3% or more than the large fineness fibers. 5. A wiping cloth made of a high-density knitted fabric according to claim 1, which has a dry heat shrinkage at 160 ° C. of 5% or less and a washing shrinkage of 5% or less. . 6. The friction resistance under a load of 1 kg / 35 cm ² is 4
It is in the range of 00 to 900 g.
A wiping cloth made of the high-density knitted fabric according to any one of items 1 to 5. 7. A wiping cloth made of a high density knitted fabric according to claim 1, wherein the knitted fabric is a circular knitted fabric. 8. A wiping cloth made of a high-density knitted fabric according to claim 1, wherein the knitted fabric has a thickness of 0.4 to 0.8 mm. 9. The ultrafine synthetic fiber and the large fineness synthetic fiber are made of polyester.
To a high-density knitted fabric according to any one of 10. A knitted fabric produced by knitting using a composite yarn composed of a composite fiber temporary twisted yarn having a sea-island structure with a fineness of an island component of 0.1 denier or less and a high shrinkage fiber in hot water. A method for producing a wiping cloth composed of a high-density knitted fabric, which comprises subjecting the knitted fabric surface to water jet processing after treatment to remove sea components. 11. The boiling water shrinkage ratio of the high fineness fiber is 10 to 25.
The method for manufacturing a wiping cloth made of a high-density knitted fabric according to claim 10, wherein the wiping cloth is in the range of%.