JP2904548B2 - Double knitted fabric with pile - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a double knitted fabric having a pile. More specifically, the present invention relates to a double knitted fabric having a pile, which is suitable for a water supply material such as a towel or a foot wipe mat, which is required to have a high water absorbing function.

[Prior art and problems to be solved by the invention] Conventionally, pile fabrics having excellent water absorption are used for water-absorbing materials such as towels and foot wiping mats which require water absorption because of their structure and high basis weight. It has been. However, the water-absorbing performance of these pile fabrics mainly depends on the water-absorbing properties of the material fibers, and therefore the amount of water absorption per unit area is naturally limited, and is not always satisfactory in individual fields. For example, towels used after bathing and after washing hair need to quickly remove water from the body surface and paper, and high water absorption performance is required.However, when removing moisture from hair after washing hair, Despite the insufficient removal, the user often experiences that the towel surface is already wet and a new wiping effect cannot be obtained. In addition, the same applies to a foot wiping mat provided in a dressing room such as a bathroom or a pool yard, and because of insufficient water absorption, a sticky wet or wet feeling is left, which may be very unpleasant.

In order to improve water absorption from such a thing, the thickness of the pile fabric is increased to increase the basis weight per unit area, the pile shape and density of the fabric surface are increased to increase the surface area, and the single-sided pile fabric is bonded by bonding. Attempts have been made to improve the water-absorbing performance by combining them, but if the basis weight is increased, the amount of water absorption is slightly improved, but the weight becomes heavy and the feeling becomes hard, which is not preferable.

In addition, improvement by pile shape and density is effective,
Not enough. Further, the method of laminating a single-sided pile fabric has a disadvantage that the texture is inevitably hard because two fabrics are laminated with an adhesive. Thus, there is not yet a fabric having sufficient water absorption that can be used in these fields.

SUMMARY OF THE INVENTION An object of the present invention is to provide a fabric which is excellent in water propagation, has extremely large water absorption, and has good wiping properties.

[Means for solving the problem]

The process of absorbing water by a fabric begins with the encounter between the fabric and water, at which time the water is at the interface with the fabric. Next, the water migrates onto the fiber on the surface of the fabric, and the water further propagates on the surface of the fiber, and spreads three-dimensionally to the surface and the inside of the fabric. This continuous state is the process of water absorption, and the quality of water absorption is determined by how fast water is absorbed.

The present inventors have conducted intensive studies on the principle of water absorption of the fabric, and as a result, the water absorption performance of the fabric is determined by the total amount of water absorption by the fiber itself and the amount of water retained inside the fabric. In order to find the difference, and to improve the water absorption performance of the fabric, it is only necessary to increase the water absorption of the fiber itself, the water retention inside the fabric, and the water retention of the fabric surface, which will be described later. The focus was on using a high material and forming a fabric structure having a high water retention effect.

The water supply amount of the fiber itself, the water retention amount inside the cloth, and the water retention amount on the cloth surface were determined as follows.

A commercially available cotton pile fabric towel was obtained, washed with a conventional household washing machine, dried, and weighed (A). Next, [1] the sample was immersed in normal-temperature water for 30 minutes, taken out, left suspended for 5 minutes, and weighed (B). [2] The same immersion was dehydrated for 30 seconds with a dehydrator of a household washing machine and weighed (C). Further [3]
The other was centrifugally dehydrated at 3500 rpm for 5 minutes and weighed (D). For (D), the dehydration time was changed to 5, 7, and 10 minutes, but no change was observed in the weight.

The water absorption capacity in each method was determined by the following equation.

[1] Method B / A [2] Method C / A [3] Method D / A According to it, [1] method is 3.25, [2] method is 0.85, and [3] method is 0.33.
Was obtained.

By the way, using a pile knitted fabric of polyester and similarly evaluated, [1] method was 2.73, [2] method was 0.28,
The method [3] obtained a result of 0.01.

The method [3] is the amount of water absorbed by the fiber itself, the method [2] is the amount of water absorbed by the fiber itself and the amount of water retained inside the cloth, and the method [1] is the amount of water absorbed by the fiber itself, the amount of water retained inside the cloth and the surface of the cloth. It indicates the amount of water retained.

The present inventors have arrived at the present invention as a result of intensive studies based on the above findings. That is, the above-mentioned object of the present invention is a knitted fabric comprising the front and back ground knitted fabrics and a connecting yarn for connecting them, wherein a pile is formed on at least one surface of the knitted fabric, and This is achieved by a double knitted fabric, wherein the connecting yarn is a yarn made of a fiber having a water swelling degree of 60% or more. More preferably, the connecting yarn is a regenerated cellulose fiber yarn. Furthermore, it is preferable to arrange the individual stitches of the ground knitted fabric portion such that the yarn forming the ground knitted fabric appears on the inner side and the connecting yarn appears on the outer side.

With this configuration, it is possible to obtain a double knitted fabric with dramatically improved water propagation and water absorption.

FIG. 1 is a schematic perspective view showing a preferred example of a double knitted fabric having a pile according to the present invention. As shown in FIG. 1, the double knitted fabric 1 of the present invention comprises a front knitted fabric 2 and a back knitted fabric 3.
And a connecting yarn 4 for connecting both ground knitted fabrics 2 and 3, and piles 5 a and 5 b are provided on both surfaces of the knitted fabric 1. A space 6 is formed around the connection yarn 4. The pile may be provided only on one side of the knitted fabric 1, more particularly on the side that water first contacts in use. The pile shape in the double knitted fabric of the present invention is a raised pile.

Further, it is preferable to set the layer composed of the connecting yarn 4 and the space 6 so that the distance between the front and back knitted fabrics is at least 1 mm or more in order to achieve the object of the present invention.

The double knitted fabric having the raised pile of the present invention can be produced by the following method.

Knit a double knitted fabric using a double lash warp knitting machine having two rows of needle beds or a double needle bed circular knitting machine, and then, with a yarn of a knitted fabric that supports the connecting yarns present on the front and back knitted fabrics The double knitted fabric of the raised pile can be obtained by raising the portion of the connecting yarn existing for connection in the front and back knitted fabrics.

In this case, the individual stitches of the ground knitted fabric portion are composed of the connecting yarn and the yarn forming the ground knitted fabric. If the reversible arrangement is adopted so that the connecting yarn appears on the outside, the water absorbing property of the knitted fabric, the stickiness of the surface,
This is preferable because the feeling can be further improved.

When the denier of the yarn forming the ground knitted fabric portion is 1, the denier of the connecting yarn is preferably 1.2 or more, more preferably 1.5 or more.
With the above, the reversible effect of each stitch of the ground knitted fabric portion constituted by two types of yarns is improved.

When the bending hardness of the yarn forming the ground knitted fabric is set to 1, the same effect can be obtained by setting the bending hardness of the connecting yarn to preferably 2 or more.

This makes it possible to easily raise the connecting yarn arranged on the outside using a general raising machine.

As the reversible effect increases, the proportion of the connecting yarn on the surface of the ground knitted fabric portion increases. When the knitted fabric is raised, the raised surface is covered only with the yarn constituting the connecting portion, so that a cloth having various characteristics can be obtained depending on the material used for the connecting yarn.

Further, it is necessary to use fibers having excellent water absorbency for part or all of the pile portion and the connecting yarn formed on the surface, and in particular, a yarn made of a fiber having a water swelling degree of 60% or more as the connecting yarn. It is necessary to use.

The degree of water swelling here indicates that the larger the value of the weight ratio of the fiber to the absolute dry weight when wet, the more water is taken into the fiber. To give some examples,
The viscose rayon has a water swelling degree of 95 to 100%, and the copper ammonia method rayon has a water swelling degree of 60 to 70%, and a yarn composed of these fibers can be used as a connecting yarn. Also, yarns made of regenerated cellulose fibers such as polynosic fibers or artificial fibers having a water swelling degree of 60% or more by chemical modification can be used as the connecting yarns. As described later, the water swelling degree is a physical property determined by measuring a test piece made of a yarn or a cloth. Yarn composed of ultra-fine fibers such as cross-section fibers and 0.1 denier or less
If the yarn is 60% or more, the object of the present invention can be achieved.

[Action]

In the double knitted fabric of the present invention, the presence of the pile on the surface of the knitted fabric increases the contact area between the fiber and the water, thereby increasing the water absorption speed and increasing the water holding capacity in the pile portion. Became.

Further, the present invention is characterized in that it comprises a front and back ground knitted fabric and a connecting yarn for connecting them, and the water absorbed and retained by the pile is composed of a connecting yarn of a double knitted fabric and an air layer. Water is conveyed to the connecting portion, where the water is retained and absorbed, so that an unprecedentedly high water absorption rate and water absorption can be obtained.

Furthermore, it was also found out that such a fabric structure was excellent in texture and feeling compared to those obtained by bonding a conventional cotton pile fabric or a raised fabric.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to Examples, and a performance comparison with Comparative Examples will be made.

 The water absorption performance in this example is represented by the degree of water swelling and the water absorption ratio.

Prior to the description of the embodiments, definitions and measurement methods of technical terms used for performance evaluation are collectively shown.

水 Water swelling degree: A test piece (yarn or cloth) is immersed in normal-temperature water for 15 minutes, dehydrated at 3500 rpm for 5 minutes with a centrifugal dehydrator, and weighed (A).

Further, drying is performed at 105 ° C. for 120 minutes using a dryer, and the absolute dry weight is obtained (B).

Ask at.

◎ Water absorption: The test piece (yarn or cloth) is immersed in room temperature water for 30 minutes, and then subjected to the following dehydration to determine the water absorption ratio with respect to the weight before immersion in room temperature water.

That is, after being immersed in room temperature water, it is taken out and suspended for 5 minutes, and weighed.

◎ Yarn bending hardness: Measuring machine “KESF” manufactured by Kato Tech Co., Ltd.
B2. Pure bending tester "was used to determine the bending hardness of the yarn.

A feeling of stickiness on the surface: The stickiness on the surface of the test piece after dehydration was evaluated by a handling test using five monitors in the measurement of water absorption.

A: No stickiness was felt at all.

○: 〃 I do not feel much.

Δ: Slightly sticky.

×: Stickiness is severe.

風 Hand: Performed by evaluating the sensitivity of five monitors.

：: Good texture.

Δ: 普通 Normal.

×: 〃 Bad.

Examples 1 to 3 Using a double Raschel warp knitting machine having two rows of needle beds manufactured by River Co., the front and back ground knitted fabric portions were composed of 70 denier, 24 filament nylon filament yarns, and were used as connecting yarns.
A double knit fabric was obtained using a 150 denier, 40 filament viscose rayon yarn. The bending hardness of the nylon filament yarn is 5 × 10 ⁻⁴ g.cm/line, and the bending hardness of the viscose rayon yarn is 1.6 × 10 ⁻⁴ g.cm/line. At this time 2
The spacing of the needle beds in the rows was changed to 3mm, 5mm, 7mm. The double knitted fabric thus obtained was dyed, and then the viscose rayon yarn in the needle loops of the front and back ground knitted fabric portions was brushed using a raising machine to obtain the double knitted fabric of the present invention. .

In the case where the spacing of the needle bed 5mm are obtained double knitted fabric of 600 g / m ^2, the distance from the outer surface of the land knitted fabric of the front of the double knitted fabric to the back side of the land knitted outer surface Was 4 mm when measured without compressing the knitted fabric. (Excluding the length of the pile portion shown in FIG. 1) Further, as comparative examples, those which do not raise the surface of the double knitted fabric of the example were prepared, and the water absorption ratios of Examples 1 to 3 and Comparative Examples 1 to 3 were prepared. , The stickiness of the surface was evaluated and the result
It is shown in the table.

As shown in Table 1, the double knitted fabrics of Examples 1 to 3 exhibited extremely high water absorption, which could not be obtained with the conventional knitted fabric, and had a good feel.

Examples 4 to 7 Double knitted fabrics were obtained under the following conditions using a double Raschel warp knitting machine having two rows of needle beds manufactured by River Corporation. The reversible effect was evaluated by changing the bending hardness of the nylon yarn and viscose rayon connecting yarn forming the ground knitted fabric portion and the denier ratio of the yarn as shown in Table 2 by setting the interval between the two needle beds to 3 mm. . The evaluation method was determined by dyeing the connected yarn. As shown in Table 2, the present invention provided an extremely good reversible effect. Also, the viscose rayon yarns in the needle loops of the front and back knitted fabric portions were raised on the knitted fabric using a raising machine, and the water absorption ratio and the stickiness of the surface were evaluated. The results are shown in Table 2.

As shown in Table 2, the product of the present invention exhibited extremely high water absorption, and the brushed surface was covered with only viscose rayon yarn.

[Effects of the Invention] The double knitted fabric having the pile of the present invention has extremely high water transmission and water absorption, and is required to have moisture absorption and heat retention as well as in the field of water supply materials such as towels and foot wipe mats. Sheets,
It is suitable for the field of bedding such as towels and the field of clothing.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a preferred example of a double knitted fabric having a pile according to the present invention. 1 ... double knitted fabric having a pile, 2, 3 ... ground knitted fabric, 4 ... connecting yarn, 5a, 5b ... pile, 6 ... space.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-24437 (JP, A) JP-A-61-37214 (JP, A) Fully open Showa 64-7284 (JP, U) Really open Showa 64- 7283 (JP, U) Fully open 1987-164876 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) D04B 1/00-1/28 D04B 21/00-21/20 A47G 27/02

Claims (2)

(57) [Claims] 1. A knitted fabric comprising front and back ground knitted fabrics and connecting yarns for connecting them, wherein a pile is formed on at least one surface of the knitted fabric, and the connecting yarns are 60% A double knitted fabric characterized by a yarn made of a fiber having the above-mentioned water swelling degree. 2. The double knitted fabric according to claim 1, wherein said connecting yarn is a regenerated cellulose fiber yarn.