JP2002235263A - Knitted fabric having excellent windproof property and soft feeing, and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a knitted fabric having both soft feeling and excellent windproof properties. SOLUTION: In this knitted fabric air permeability P (ml/cm2.s) of the knitted fabric, fineness T (dtex) of the yarn composing the knitted fabric, course density D1 (number/2.54 cm) and wale density D2 (number/2.54 cm) of the knitted fabric weave simultaneously satisfies the following formulae (1) and (2).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a knitted fabric excellent in windproofness used for clothing such as casual, sports, athletic and the like.

[0002]

2. Description of the Related Art Knitted fabrics having low air permeability are widely used as windproof knitted fabrics for clothing such as casual, sports, athletic, etc. Generally, these windproofed knitted fabrics have a course density and a wale density of a knitted fabric. It is obtained by increasing the density as much as possible, that is, by increasing the density of the knitted structure. Conventionally, the density of the knitted fabric has been increased by using a high-density knitting machine (high gauge) and carefully examining knitting conditions and the like, but as the number of supplied yarns increases,
The knitting preparation and knitting operations become complicated, and it is difficult to improve the knitting speed.In addition, yarn breakage is liable to occur at the time of knitting, and the cost is increased due to a decrease in yield. Had. Further, as another method, a method has been proposed in which at least a part of the knitted fabric is made of high-shrinkable fibers, and the high-shrinkable fibers are shrunk in a dyeing step to increase the density of the knitted fabric. In this case, the texture of the knitted fabric is likely to be hard, and there is a concern that the commercial value of the windproof knitted fabric may be reduced.

[0003]

SUMMARY OF THE INVENTION In view of the above situation, an object of the present invention is to provide a knitted fabric having both a soft touch and excellent windproofness.

[0004]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, the knitted fabric has an efficient structure by applying a high-pressure liquid columnar flow while running the knitted fabric in a spread state. Was found to be filled, and by further examination, the relationship between the product of the half power of fineness usually called a cover factor and the knitting density (hereinafter sometimes abbreviated as CF) and the air permeability of the knitted fabric As a result of the investigation, despite the fact that it is a knitted fabric with a low CF and soft texture, it has reached the technical idea of realizing excellent windproofness (low air permeability),
The present invention has been completed. The filling of the knitted fabric in the present invention means that a gap generated in a stitch loop of the knitted fabric is closed.

That is, the gist of the present invention is as follows. First, the air permeability P (ml / cm ² · second) of the knit, the fineness T (decitex) of the yarn constituting the knit, and the course density D of the knit structure
₁ (books / 2.54cm) and wale density D ₂ (books / 2.54c)
m) simultaneously satisfies the following formulas (1) and (2).

[0006]

(Equation 2)

Second, the method for producing a knitted fabric according to claim 1, further comprising a step of applying a high-pressure liquid columnar flow to the surface of the knitted fabric.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
The knitted fabric of the present invention has both a soft hand and a windproof property. Usually, the texture of the knitted material tends to be harder as the knitting density D (the number of yarns per unit width length of the knitted structure) increases, and the texture tends to be harder as the fineness T of the yarn increases. On the other hand, the air permeability P (the lower the air permeability, the better the wind resistance), which is a measure of the wind resistance, is generally lower as the knitting density D increases, and lower as the yarn fineness T increases.

By the way, a cover factor is often used as a scale indicating the two-dimensional density of the structure on the surface of the knitted fabric, and the cover factor is represented by, for example, the following formula.

[0010]

(Equation 3) CF: Cover factor D: Knitting density T: Fineness

The cover factor is a measure of the proportion of the portion occupied by the yarn (the portion that is not a void) in the area of the surface of the knitted fabric (the product of the width and length of the knitted fabric).
Generally, the larger the cover factor, the lower the air permeability. The knitted fabric of the present invention achieves both of these contradictory characteristics, and has a permeability P (ml / c) of the knitted fabric.
m ² · sec), the fineness T (decitex) of the yarn constituting the knitted fabric, the course density D ₁ (books / 2.54 cm) and the wale density D ₂ (books / 2.54 cm) of the knitted fabric are represented by the following formulas. A knitted fabric that satisfies (1) and (2) simultaneously, and preferably a knitted fabric that satisfies the following formulas (1) and (2) at the same time.

[0012]

(Equation 4)

[0013]

(Equation 5)

Which satisfies the above equations (1) and (2) simultaneously.
If not, the wind resistance is not good for the cover factor.
Can not achieve both softness of the texture and excellent windproofness,
The object of the present invention cannot be achieved. In addition, as the value of P,
From the viewpoint of wind resistance, 250 (ml / cm^Two・ Seconds) Less is better
Preferably, 230 (ml / cm^Two・ Second) The following is more preferable
, 200 (ml / cm ^TwoSecond) is particularly preferred. Ma
D₁× √T and D_Two× ΔT is difficult to knit
From the viewpoint of pod texture, each must be 500 or less.
Is preferred.

Next, a method for producing the knitted fabric of the present invention will be described. First, a yarn is knitted to obtain a knit. The type of the fiber material constituting the yarn and the cross-sectional form of the fiber are not particularly limited, and various yarns made of various fiber materials can be used. Can be used without. The fineness of the yarn is also not particularly limited, but considering the effect of tissue filling by the high-pressure liquid columnar flow described below and the softness of the texture, it is preferable that the single fiber fineness is not so large, and the single fiber fineness is not so large. A spun yarn or a multifilament yarn composed of fibers of about 5 dtex or less is preferably used. Also, the knitting structure is not particularly limited, and a knitted fabric can be obtained by a conventional method using a known knitting machine.

Next, a step of applying a high-pressure liquid columnar flow to the surface of the knitted fabric while running the obtained knitted fabric in a spread state is performed. In addition, as the step of applying the high-pressure liquid columnar flow to the surface of the knit, after knitting, after scouring, after presetting, after dyeing, etc.
It may be performed at any time.

In the present invention, the high-pressure liquid columnar flow refers to a liquid flow obtained by injecting a liquid at a high pressure through a fine injection hole. As the liquid, water or warm water is preferably used for ease of handling, but may contain a surfactant, an oil agent, a finishing agent, and the like. As the injection hole, a fine hole having a hole diameter of 0.05 to 1.00 mm, particularly a circular hole having a diameter of about 0.1 to 0.4 mm or an elliptical fine hole having a long diameter of about 0.10 to 0.60 mm is preferable. Injection hole diameter is 0.05mm
If it is less than 100%, the frequency at which the injection holes are closed is increased, which is not practically preferable. On the other hand, if it exceeds 1.00 mm, the high pressure liquid columnar flow is too thick, and it tends to be difficult to obtain a uniform treatment effect, which is not preferable.

The injection holes as described above are preferably on a straight line.
By injecting the liquid at a high pressure from an injection nozzle having a plurality of rows arranged at intervals of about 5 to 30 pieces / cm, a high-pressure liquid columnar flow can be provided. At this time, although it depends on the diameter of the injection holes, the sum of the dimensions of each of the arranged injection holes in the width direction with respect to the distance H in the width direction of the knitted fabric (a plurality of rows arranged in a plurality of rows along the width direction). It is particularly preferable to design the arrangement density of the injection holes such that the value obtained by accumulating the dimensions of the injection holes is 0.7 H or more, which is advantageous in obtaining an even and uniform processing effect.

The flow velocity of the high pressure liquid columnar flow is 2 m / sec.
300 m / sec is preferred. If the flow velocity is less than 2 m / sec, the desired effect may not be obtained even if the high-pressure liquid columnar flow is applied for a long time due to energy shortage. On the other hand, if the flow velocity exceeds 300 m / sec, the energy is too large, and the fibers constituting the knitted fabric may be cut and the knitted fabric structure may be largely disturbed (run or the like), which is not preferable.

The injection pressure of the high pressure liquid columnar flow is 0.4
A pressure of about 15 MPa is preferably employed. Injection pressure
If the pressure is less than 0.4 MPa, the treatment effect of the high-pressure liquid columnar flow is small, and it becomes difficult to fill the fabric structure, which is not preferable. On the other hand, if the injection pressure exceeds 15 MPa, the texture of the knitted fabric is disturbed to cause partial density unevenness, or the fibers constituting the knitted fabric are cut to cause a decrease in the physical properties of the knitted fabric,
It is not preferable because the knitted fabric itself may be cut.

When applying the high-pressure liquid columnar flow to the surface of the knitted fabric, the distance between the surface of the knitted fabric and the injection hole is 0.5 to 1
About 5 cm is preferable. If this distance exceeds 15 cm, the high-pressure liquid columnar flow will be disturbed or the energy loss will be large due to air resistance or static electricity generated by friction with the air, resulting in a large decrease in treatment efficiency and a decrease in treatment effect. It is not preferable because uniformity may be caused. On the other hand, if the distance is less than 0.5 cm, the knitted fabric may come into contact with the injection hole, or the surface texture of the knitted fabric is greatly disturbed, and the trace of the water flow appears as a warp, and the knitted product It is not preferable because the value may be greatly impaired.

In the present invention, when the step of applying the high-pressure liquid columnar flow to the surface of the knitted fabric is performed, it is desirable that the knitted fabric be run in a spread state. If the knitted fabric is run in a rope-like or partially overlapped state rather than a spread-like shape, uniform treatment cannot be performed, and it may cause unevenness or uneven surface feeling in the windproof, which is preferable. Absent.

The running speed of the knitted fabric at this time is preferably in the range of 1 to 50 m / min from the viewpoint that the knitted fabric structure can be sufficiently filled, and particularly preferably in the range of 3 to 25 m / min. preferable. If the speed at which the knit is run is less than 1 m / min, it tends to be difficult to fill the knit structure, and the processing speed is too slow to lower the productivity as a continuous process, which is not preferable. On the other hand, if the running speed of the knitted fabric exceeds 50 m / min, the time during which the high-pressure liquid columnar flow can act on the fibers constituting the knitted fabric is too short, and the knitted fabric is not easily filled, which is not preferable.

By performing the step of applying the high-pressure liquid columnar flow to the surface of the knitted fabric, the fiber bundles constituting the knitted fabric are loosened and defibrated, the knitted fabric is filled, and the windproofness of the knitted fabric is improved. In particular, by performing the above-described processing while running the knitted fabric, the high-pressure liquid columnar flow acts on the surface of the knitted fabric relatively obliquely from above, so that the fiber bundles constituting the knitted fabric are perpendicular to the surface of the knitted fabric. Not only that, it is also loosened in the horizontal direction and is more effectively defibrated. In this way, the apparent fiber bundle becomes larger by being loosened and defibrated, the gap of the stitch loop is closed, and at the tissue point where the stitch loop intersects, the intersecting area has a superimposed structure in which the intersecting area is large. The voids between the yarns formed in the structure are extremely small, and as a result, the knitted fabric obtained by applying the high-pressure liquid columnar flow has significantly reduced air permeability and excellent windproofness. In addition, by performing the step of applying the high-pressure liquid columnar flow to the surface of the knitted fabric, since the entanglement of the fiber between the fiber bundles constituting the knitted fabric or at the tissue point also occurs, there is a concern due to movement during washing and wearing. The knitted structure and the arrangement of the constituent fibers are less likely to be disturbed, and the obtained windproof property is held semipermanently. On the other hand, since the treatment for applying the high-pressure liquid columnar flow to the surface of the knitted fabric does not involve an increase in knitting density, it is difficult to harden the texture of the knitted fabric, and the high-pressure liquid columnar flow acts to fill the knitted fabric structure. At the same time, the knitted fabric of the present invention, which is soft, has high quality, and is excellent in windproofness, has an effect of softening the texture of rubbing and throwing.

[0025]

Next, the present invention will be described specifically with reference to examples. The characteristics of the knitted fabric shown in the examples were measured or evaluated by the following methods. -Air permeability P Measured according to JIS L1018. The smaller the value of the air permeability, the more excellent the wind resistance. -Hand feeling A sensory test was performed by touch, and the hardness of the knitted fabric was relatively evaluated in the following three grades. ：: Soft. Δ: Somewhat hard. X: Hard.

Example 1 Using a polyester filament false twist yarn and 167 dtex / 48 filament, a circular knitted fabric having a tissue interlock was knitted (hook diameter: 33 inches, gauge number: 32G).
This was subjected to scouring, presetting and dyeing according to a conventional method. Then, using a spunlace device manufactured by Honeycomb, while the knitted fabric was run at a speed of 10 m / min in a spread state, the injection holes having a hole diameter of 0.14 mm were 160 cm at 0.6 mm intervals.
By injecting water at a normal temperature (about 20 ° C.) at a pressure of 4.9 MPa from the injection nozzles arranged in three rows between the nozzles, a high-pressure water column flow was applied to the surface of the knitted fabric. Then, the knitted fabric was subjected to a final set by a conventional method to obtain a knitted fabric of the present invention.

Example 2 Polyester filament false twist yarn, 84 dtex /
A knit of the present invention was obtained in the same manner as in Example 1 except that 72 filaments were used and knitting density was changed.

Comparative Example 1 A circular knitted fabric having a tissue interlock was knitted using the same polyester filament false-twisted yarn as in Example 1, and this was subjected to scouring, presetting, dyeing, and final setting by a conventional method, and a knitted fabric for comparison was obtained. I got

Comparative Example 2 Using the same polyester filament false twist yarn as in Example 1, a knitted circular knitted fabric having a high-density tissue interlock was formed by knitting as much as possible on a knitting machine during knitting. This was subjected to scouring, pre-setting, dyeing and final setting by a conventional method to obtain a knitted fabric for comparison.

Example 3 Circular knitted fabric made of textured nylon using a nylon filament false twist yarn and a 78 decitex / 36 filament having a hot water shrinkage (measured in accordance with JIS L1013 A method, the same applies hereinafter) of 5%. (Kama diameter: 30 inches, gauge number: 28 G), and scouring and presetting were performed by a conventional method. Then, using a spunlace device manufactured by Honeycomb, while the knitted fabric was run at a speed of 15 m / min in a spread state, injection holes having a hole diameter of 0.32 mm were arranged in three rows at intervals of 0.6 mm between 160 cm. 3. from the nozzle;
By injecting normal-temperature water at a pressure of 9 MPa, a high-pressure water columnar flow was applied to the surface of the knitted fabric. Then, the knitted fabric was subjected to dyeing and final setting by a conventional method to obtain a knitted fabric of the present invention.

Comparative Example 3 Nylon filament false twist yarn having a hot water shrinkage of 5%, 78
Using a decitex / 36 filament, knit a circular knit of tissue sheeting, knead it with a conventional method, scour,
Dyeing and final setting were performed to obtain a knitted fabric for comparison.

Comparative Example 4 Nylon filament false twist yarn having a hot water shrinkage of 15%, 7
Using 8 dtex / 36 filaments, a circular knitted fabric made of tissue is knitted, subjected to scouring, presetting, dyeing, and final setting by a conventional method, and densified by shrinking the knitted material in a dyeing process. A knitted fabric for comparison was obtained.

With respect to the above Examples and Comparative Examples, the density (finish density), air permeability, and texture of the obtained knitted product are shown in Table 1 below.
Shown in For each knit, the air permeability P and D
_The results of examining the relationship between ₁ × ΔT and D ₂ × ΔT are shown in FIGS.

[0034]

[Table 1]

As shown in FIGS. 1 to 3, the knitted fabric of the present invention that satisfies the above-mentioned equations (1) and (2) at the same time has a low air permeability for the knitted fabric density (cover factor). As can be seen from the results in Table 1, it had both excellent windproofness and soft texture. On the other hand, in the comparative example, the above formulas (1) and (2) were not satisfied. That is, the knitted fabrics of Comparative Examples 1 and 3 had the same level of cover factor as the knitted fabric of the example, and had the same softness of the hand, but had a large air permeability and were inferior in windproofness. The knitted fabrics of Comparative Examples 2 and 4
Not only was it inferior in wind resistance to the knitted fabric of the example, but also inferior in softness of the hand.

[0036]

The knitted fabric of the present invention is an epoch-making knitted fabric having both soft texture and excellent windproofness,
It can be suitably used for clothing such as sports and athletic. Further, according to the production method of the present invention including the step of applying a high-pressure liquid columnar flow to the surface of the knit, without impairing the soft texture of the knit, versatile, at low cost, semipermanent excellent Wind resistance can be imparted to the knitted fabric, and the knitted fabric of the present invention can be manufactured.

[Brief description of the drawings]

FIG. 1 Fineness T and course density D _{1 of} the yarn constituting the knitted fabric
Is a graph showing the relationship between the values of D ₁ × ΔT determined from the above formula on the vertical axis and the value of the air permeability P of the knitted material on the horizontal axis.

FIG. 2 Fineness T and wale density D of yarn constituting a knitted fabric
₂ is a graph showing the relationship between D ₂ × ΔT obtained from No. ₂ on the vertical axis and the value of the air permeability P of the knitted material on the horizontal axis.

FIG. 3 shows the relationship between the value of D ₁ × √T and the value of P, and D ₂ × √
5 is a graph showing the relationship between the value of T and the value of P at the same time.

[Explanation of symbols]

a ₁ Example 1 (course) b ₁ Example 2 (course) c ₁ Example 3 (course) d ₁ Comparative Example 1 (course) e ₁ Comparative Example 2 (course) f ₁ Comparative Example 3 (course) g ₁ Comparative Example 4 (course) a ₂ Example 1 (Wale) b ₂ Example 2 (Wale) c ₂ Example 3 (Wale) d ₂ Comparative Example 1 (Wale) e ₂ Comparative Example 2 (Wale) f ₂ Comparative Example 3 (Wale) g ₂ Comparative Example 4 (Wale)

Claims (2)

[Claims] 1. The air permeability P (ml / cm ² · second) of the knitted fabric, the fineness T (decitex) of the yarn constituting the knitted fabric, the course density D ₁ (book / 2.54 cm) of the knitted fabric and the wale density A knitted fabric characterized in that D ₂ (books / 2.54 cm) simultaneously satisfies the following formulas (1) and (2). (Equation 1) 2. The method for producing a knitted fabric according to claim 1, further comprising a step of applying a high-pressure liquid columnar flow to the surface of the knitted fabric.