JP2007075236A - Blood flow rate promoting elastic stocking - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide elastic stockings reducing stuffed feeling by applying moisture-absorbing/releasing property to the elastic stockings apt to be a thick texture and providing the user with a comfortable wearing feeling. <P>SOLUTION: The blood flow rate promoting elastic stockings are characterized in using the texture having the moisture-absorbing/releasing difference ratio ΔMR of 2.5% or more at least in the leg portions in the stockings formed of polyamide fiber and elastic fiber. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a blood flow velocity-enhancing elastic stocking intended not only for medical purposes such as thrombus generation suppression and varicose vein prevention but also for the purpose of suppressing swelling of the lower limbs.
The stockings referred to in the present invention refer to pantyhose, long stockings up to the inseam, and stockings and tights products represented by short stockings under the knee.

Conventionally, thrombosis that has occurred in the veins of the lower limbs is carried to the lungs in the bloodstream, clogging the pulmonary arteries and reducing the oxygen supply capacity in the body, pulmonary embolism is known, and in severe cases It can lead to death.
Thrombus is known to occur in veins where blood flow stagnation or regurgitation has occurred. One of the causes of pulmonary embolism is due to general anesthesia for surgical patients. When anesthesia acts on the human body, blood vessel dilation is induced, and as a result, the venous blood flow velocity in the lower limbs is reduced and thrombus is generated.

  In addition, even in healthy persons, if the sitting state continues for a long time with a vehicle or desk work, blood circulation in the lower limbs may deteriorate and swelling may occur. Further worsening induces blood clots that can flow into the lungs and cause acute pulmonary embolism known as “economy class syndrome”.

  For such symptoms, it is necessary to promote the blood flow velocity of the lower limb vein, and elastic stockings are conventionally known as an effective means and are widely used mainly in medical institutions. In addition, non-medical elastic stockings for preventing swelling are commercially available for healthy persons.

  The general design concept of an elastic stocking is to apply a pumping action to venous blood by applying the highest pressure on the ankle and then applying a pressure gradient that decreases the pressure toward the upper limb. However, the magnitude of the pressure and the setting of the pressure gradient vary depending on the disease and the purpose of wearing, and various elastic stockings have been proposed regardless of medical use or non-medical use.

  For example, JP-A-2-19501, JP-A-11-47186, and JP-A-13-140104 propose stockings that increase the blood flow rate step by step for each part of the leg. Yes.

However, such elastic stockings often use fibers with strong stretch force in order to apply a large pressure, which inevitably becomes a fabric with a great sense of ground thickness and a fabric with mixed stitches. As a result, there is a drawback that heat can be easily stored in the fabric, air permeability is poor, and a feeling of stuffiness is easily felt. The difference in moisture absorption and release rate ΔMR between the stocking fabrics is usually as small as about 2.0%.
Japanese Patent Laid-Open No. 2-19501 Japanese Patent Laid-Open No. 11-47186 Japanese Patent Laid-Open No. 13-140104

  The object of the present invention is to solve the above-mentioned drawbacks of the prior art, thereby reducing the feeling of stuffiness when wearing stockings and providing a comfortable wearing feeling.

In order to achieve the above object, the blood flow velocity promoting elastic stocking of the present invention has the following configuration.
(1) A blood flow velocity promoting elastic stocking characterized in that, in a stocking mainly composed of polyamide fiber and elastic fiber, a fabric having a moisture absorption / release difference ΔMR of 2.5% or more is used at least in the leg part. .
(2) The blood flow velocity promoting elastic stocking according to the above 1, wherein at least some of the polyamide fibers constituting the stocking contain 3% to 20% by weight of polyvinylpyrrolidone.
(3) The blood flow velocity promoting elastic stocking according to the above (1) or (2), wherein an elastic fiber having moisture absorption / release properties is used at least in part.

  The blood flow velocity promoting elastic stocking of the present invention improves the feeling of stuffiness by using a knitted fabric to which moisture absorption and desorption is imparted, and provides a comfortable wearing feeling.

  Hereinafter, the blood flow velocity promoting elastic stocking of the present invention will be described.

  The blood flow velocity promoting elastic stocking of the present invention requires that the moisture absorption difference ΔMR (hereinafter referred to as ΔMR only) is 2.5% or more in at least a part of the fabric, and is 3.0% by weight or more. If there is, it is preferable because a comfortable feeling can be realized. If ΔMR is smaller than 2.5%, sufficient moisture absorption / release properties cannot be obtained, and the feeling of stuffiness when worn is not eliminated, resulting in poor comfort.

  The elastic stocking of the present invention is composed of a coated elastic yarn in which a polyamide fiber is coated with a single or double core yarn represented by polyurethane or a non-elastic yarn represented by polyamide continuous fiber.

  Generally, stockings can be classified into a zokkki type and a knitting type depending on the use of the leg part, and all knitted yarns are knitted with the same covered elastic yarn or all yarns are knitted with the same inelastic yarn. The knitting type is one in which the coated elastic yarn and the polyamide continuous fiber are alternately knitted. The stockings of the present invention may be of any type, and are not limited thereto, and may be a lay-in type in which covered elastic yarns are inserted into a ground knitted fabric knitted with polyamide continuous fibers.

  A general elastic stocking is composed of a waistband, a panty, a leg, a heel, and a toe in the case of the pantyhose shown in FIG. 1, and a rubber band in the case of the long stocking and the short stocking shown in FIG. Part, leg part, heel part, and toe part. Moreover, in order to give the role of the monitor hole for confirming congestion, it may be an open toe type that does not have a toe part.

  The blood flow velocity promoting elastic stocking of the present invention changes the pressure applied to each part of the leg and provides a pressure action gradient to give a pump action to the lower limb vein. The basic design is the largest on the ankle. The pressure is applied, and the pressure is gradually lowered toward the top. Various theories have been proposed with respect to the magnitude and gradient of the wearing pressure. Typical examples include the Sigel theory of 18 mmHg at the ankle, 14 mmHg at the calf, and 10 mmHg at the thigh. Regarding the pressure design of the quick acceleration elastic stockings, there is no particular limitation on the pressure value or pressure gradient.

  In order to impart moisture absorption / release properties that can be realized, it is preferable to use a fabric having moisture absorption / release properties for the leg portion having the largest composition ratio in the stockings. Further, it is more preferable to use a fabric having moisture absorption / release properties at a relatively small component such as a heel part or a toe part. In addition, if it is a pantyhose type, if the fabric which has moisture absorption / release property is used also for a panty part, a wear comfortable feeling increases and it is effective.

  As a means for imparting moisture absorption / release properties to the fabric, a method for imparting moisture absorption / release properties to the fiber itself by adding moisture absorption / release components to the polymer, or moisture absorption / release after knitting and dyeing the knitted fabric A method of coating a resin containing a component is generally carried out, but from the viewpoint of durability of moisture absorption / release performance and fabric texture, a method of adding a moisture absorption / release component to the polymer of the fiber itself is preferable.

  As the fiber containing the moisture absorbing / releasing component, it is preferable to employ polyamide long fibers that occupy most of the weight ratio with respect to the fabric, regardless of whether it is a zock type or a knit type. ΔMR increases as the weight ratio of the hygroscopic polyamide long fibers increases, but in order to give the desired hygroscopic properties, the weight ratio of the polyamide fibers having hygroscopic properties is 30% by weight or more based on the weight of the fabric. It is preferable that it is 50% by weight or more.

  In addition, as a means for imparting moisture absorption / release properties to the polyamide long fiber itself, any method may be used as long as the desired moisture absorption / release properties can be imparted. For example, inorganic particles such as acrylic metal-modified particles exhibiting moisture absorption / release properties are mixed with the polymer. Typical methods include a polymer alloy method in which a component exhibiting moisture absorption / release properties is bonded to a polyamide polymer at a molecular level, but from the viewpoint of providing excellent moisture absorption, sufficient strength and whiteness The latter is desirable, and specific moisture absorbing / releasing components include polyether ester, polyether amide, polyether imide amide, polyether ester amide, polyvinyl pyrrolidone, etc., from the viewpoint of moisture absorbing / releasing performance and yarn production stability. Polymer obtained by adding polyvinylpyrrolidone (hereinafter referred to as PVP) to polyamide and melt spinning Alloy type polyamides are preferred. The amount of the combined polyvinyl pyrrolidone is preferably 3% by weight or more from the viewpoint of imparting sufficient moisture absorption and desorption, and moisture absorption and desorption performance increases as the amount of combination increases, but conversely increases. If it is too high, problems such as deterioration of spinnability and decrease in fiber strength occur, so the composite ratio must be 20% by weight or less.

  Furthermore, it is preferable to use an elastic fiber having moisture absorbing / releasing properties because the moisture absorbing / releasing property of the entire stocking is increased.

  Here, polyurethane elastic fibers, polyamide elastomer elastic fibers, polyester elastomer elastic fibers, etc. are used as the elastic fibers forming the core yarn of the coated elastic yarn, but from the viewpoint of elastic characteristics and thermal characteristics for stockings. It is preferable to use polyurethane elastic fibers.

  The polyamide fiber referred to in the present invention mainly refers to nylon 6 and nylon 66, but may be nylon 610, nylon 46, or a composite of these polymers. Further, the polyamide may be blended with a matting agent, a pigment, an antistatic agent, etc., if necessary, and there are no restrictions on the fineness, the number of single yarns, and the cross-sectional shape. For example, in addition to a general round cross section, a deformed cross section such as a trilobal cross section or a hollow cross section may be used.

  The stockings in the present invention refer to stockings and tights products represented by pantyhose, long stockings up to the inseam, and short stockings under the knee.

  Moreover, you may give a deodorizing function and an antibacterial function to stockings by post-processing.

  Hereinafter, the present invention will be described in more detail with reference to examples.

In the examples, ΔMR (%) was determined by the following method. However, the present invention is not limited to these examples.
[ΔMR (%) of fiber]
Cut the stocking leg fabric about 1cm × 1cm square, weight after standing for 24 hours when completely dry (W1), weight after standing for 24 hours under 20 ℃ × 65% RH atmosphere (W2), 30 ℃ × The weight (W3) after being left for 24 hours in a 90% RH atmosphere is measured, and the moisture absorption rate in each atmosphere is determined by the following formula.

MR1 = ((W2-W1) / W1) × 100
MR2 = ((W3-W1) / W1) × 100
The moisture absorption / release moisture difference ΔMR is obtained by the following equation.
ΔMR = MR2-MR1
Here, the moisture absorption rate (%) = ((weight after moisture absorption−weight during absolute drying) / weight during absolute drying) × 100.
[Moe feeling]
Evaluation was performed by sensory evaluation when five subjects (A to E) wear stockings continuously for 8 hours. The results were evaluated in four grades: ◎: extremely comfortable, ○: comfortable, Δ: slightly uncomfortable, ×: unpleasant.

[Example 1]
A stock of two damp yarns of 78 dtex containing 48 wt% PVP and 48 filaments of hygroscopic nylon 6 woolly is used as a ground yarn for stockings, and 33 dtex containing 26 wt% of PVP in 395 dtex polyurethane fiber. Double-covering yarn (double twist: 1200 T / m, covering draft: 4.0, hereinafter referred to as DCY) in which double moisture-absorbing nylon 6 wooly yarn is wound in a four-neck knitting machine Knit, open toe type long stockings. Note that DCY lay-in is not performed on the heel portion, and the heel portion is composed of only ground wooly nylon.

  The stockings were dyed at a dyeing temperature of 90 ° C. for 30 minutes, dried, and then set for 10 seconds with a dry heat of 110 ° C. to produce a product.

When the ΔMR of the leg part of the obtained stockings was measured, it was 3.8%, and the sensory evaluation of the feeling of stuffiness was as shown in Table 1, and the feeling of stuffiness was not felt.
[Example 2]
A long stocking was knitted with the same fiber configuration and knitting design as in Example 1 except that 33 dtex, 26 filament polyamide long fiber used for DCY winding yarn was made of yarn that did not use PVP at all. The same dyeing process was applied to produce a product.

  The ΔMR of the leg part of the obtained stocking was measured and found to be 3.5%, and the sensory evaluation of the stuffiness was as shown in Table 1 and was good.

[Comparative Example 1]
The same fiber configuration as that used in Example 1, but using nylon 6 long fiber in which no PVP is added to any polyamide long fiber, the same knitting design and dyeing process as in Example 1 are used to produce a long stocking. Commercialized.

  The ΔMR of the leg part of the obtained stocking was measured and found to be 1.8%, and the sensory evaluation of stuffiness was as shown in Table 1 and was inferior in comfort.

[Comparative Example 2]
A long stocking is knitted with the same fiber configuration and knitting design as in Example 1 except that a ground yarn of 78 dtex, 48 filament nylon 6 long fiber with no PVP added is used, and the same dyeing process as in Example 1 And commercialized.
The ΔMR of the leg part of the obtained stocking was measured and found to be 2.0%, and the sensory evaluation of stuffiness was as shown in Table 1 and was inferior in comfort.

It is a mimetic diagram of stockings concerning the present invention. It is a side view of the long stocking concerning the present invention.

Explanation of symbols

1: Leg part 2: Heel part 3: Toe part 4: Waist band part 5: Panty part 6: Rubber part

Claims (3)

A blood flow velocity promoting elastic stocking characterized in that, in a stocking mainly composed of polyamide fiber and elastic fiber, a fabric having a moisture absorption difference ΔMR of 2.5% or more is used at least in a leg part. 2. The blood flow velocity promoting elastic stocking according to claim 1, wherein at least some of the polyamide fibers contain 3% by weight to 20% by weight of polyvinylpyrrolidone. The elastic stockings for promoting blood flow velocity according to claim 1 or 2, wherein elastic fibers having moisture absorption / release properties are used at least in part.

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