JP2006327977A - Cloth product having printed layer containing bamboo powder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide cloth products having a printed layer but nevertheless excellent in moisture absorbing and releasing properties, and excellent in antibacterial properties and ultraviolet shielding properties. <P>SOLUTION: The cloth product has a printed layer containing bamboo powder obtained by crushing the skin parts-removed bamboo trunk. The cloth products, even their parts having a printed layer, are excellent in moisture absorbing and releasing properties and, further, excellent in antibacterial properties and ultraviolet shielding properties. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a fabric product having a bamboo powder-containing printed layer.

  Conventionally, there has been a demand for fabric products that effectively exhibit functions such as antibacterial properties of bamboo and have high moisture absorption and desorption properties.

  It is generally known that bamboo has antibacterial properties. For example, for the purpose of antibacterial, deodorant and mite prevention, a technique is known in which a bonding process is performed using a fiber adhesive containing fine powder of bamboo mainly composed of the epidermis and the cuticle part close to the epidermis (patent) Reference 1). The outer skin of the bamboo skin and the cuticle that is close to the skin, the outer layer of the bamboo basket, is a silicic acid component that has a finer bundle sheath, a higher specific gravity, and a relatively higher active ingredient ratio than the meat part of the bamboo basket, the so-called central pillar. Is contained in a large amount, is hard and easily becomes an ultrafine powder, and has a very low moisture absorption / release property of about 1/2 to 1/3.

  On the other hand, since bamboo powder itself does not bind or adhere to fibers, various synthetic resins or synthetic rubber latices are used in combination as binders to provide practical consumption. These synthetic resins or synthetic rubber latices Has little moisture absorption / release performance.

Although it has high functionality such as antibacterial properties, it adheres the fine powder of bamboo mainly composed of the skin with relatively low moisture absorption / release properties and the cuticle part close to the skin with a binding material with almost no moisture absorption / release performance. In the bamboo fine powder processed products up to now, the fine powder is embedded in the binder and the moisture absorption / release property is poor, so that the expected effective functional effect was practically not obtained. Since the surface of the fabric was covered, it was easy to get stuffy if the moisture absorption and desorption properties were poor, and there was discomfort when worn.
Japanese Patent No. 3200689

An object of the present invention is to provide a fabric product that is excellent in moisture absorption and desorption, and has excellent antibacterial and ultraviolet shielding properties even if it has a printed layer.
The present invention compensates for the lack of the above-mentioned bamboo fine powder processing products as described above, and further, a bamboo powder-containing printed layer that effectively, economically and aesthetically exhibits many functions possessed by bamboo. It aims at providing the cloth product which has.

The present invention relates to a fabric product having a printed layer containing bamboo powder obtained by crushing a bamboo bamboo meat part from which a skin part has been removed.
In order to achieve the above-mentioned object, the functional printed fabric according to the present invention uses a relatively coarse bamboo powder obtained by crushing the central portion of a bamboo basket made of so-called parenchyma. A fabric product having a printed layer printed and developed on a fabric as a color pattern with a fixing medium.

  The fabric product of the present invention is excellent in moisture absorption and desorption, even in a portion having a printed layer, and is further excellent in antibacterial properties and ultraviolet shielding properties.

  The fabric product of the present invention has a printed layer containing bamboo powder.

  In the present invention, the fabric product on which the print layer is formed is a processed product processed into the form of interiors such as clothing such as T-shirts, pants, casual wear, and pajamas, bags, sheets, futon sides, curtains, and chairs. In addition to the simple fabric having the form of the fabric before processing, it is used in the concept (hereinafter sometimes simply referred to as fabric). The material fibers constituting the fabric product are not particularly limited, and may be, for example, cotton fibers, other natural fibers such as hemp and bamboo, cellulosic fibers such as rayon, chemical fibers such as polyester, and mixed fibers thereof.

  The bamboo powder used in the present invention is made of a relatively coarse bamboo powder obtained by crushing the central portion of the bamboo basket made of so-called parenchyma. The skin of the bamboo material and the cuticle portion close to the skin, that is, the fine powder of the outer layer of the bamboo shoot is a factor that lowers the effect expected of the present invention, and therefore it is preferable to remove as much as possible for the purpose of the present invention.

  Bamboo flour has various shapes ranging from granular to needle-like. The average particle size of the granular pulverized product is preferably 50% by number or more, particularly preferably 60% by number or more, having a particle size of 30 to 80 μm from the viewpoint of moisture absorption and desorption. In this case, there are cases where 2 to 3% by number of acicular fragments having a length in the major axis direction of 60 μm to 180 μm are mixed, and these acicular pieces contribute to further improvement in moisture absorption and desorption properties intended by the present invention. And I do not exclude it in particular. The preferred average particle size of bamboo powder having such a particle size distribution is 35 to 70 μm, particularly 40 to 60 μm.

  The particle size distribution and average particle size of the bamboo powder can be measured by a laser diffraction / scattering type particle size distribution measuring apparatus LA-700 manufactured by Horiba Ltd. The particle size means the maximum length (dimension) in the major axis direction of the bamboo powder particles. The particle size distribution and the average particle size do not have to be measured by the above device, and may be measured by any device as long as it can be measured according to the same principle as the above device.

  The method for preparing bamboo powder is not particularly limited as long as the bamboo bran portion of the bamboo from which the skin portion has been removed is crushed and pulverized. For example, the method described in JP-A-2003-71315 can be employed. . That is, the surface of the bamboo trunk material that has been naturally dried and cut to a predetermined length is ground by sandpaper to remove the skin portion. The skin portion means a surface layer portion having a depth of about 1 mm from the outermost surface of the bamboo, including a so-called cuticle portion). Next, the bamboo bran portion of the bamboo from which the skin portion has been removed is processed into a plate-like bamboo material that is divided into a plurality at substantially equal intervals in the circumferential direction by a cutter device. Thereafter, the plate-like bamboo material is crushed stepwise by a crushing device equipped with a cutter and a crushing device using a pulverizing action by a screen plate to obtain bamboo powder of a predetermined size. In the present invention, the skin portion does not necessarily have to be completely removed, and the bamboo powder may contain only a small amount of the skin portion as long as the object of the present invention is achieved.

  Bamboo used in the present invention may be of any kind, and for example, Miso bamboo, true bamboo, light bamboo, female bamboo and the like can be used. Preferably, a bamboo material of 5th grade or less having a relatively thick bamboo shoot, for example, a 3rd grade buddhist bamboo, can exhibit the effect of the present invention more.

  In order to form a printed layer on a fabric as a color pattern with a sticking agent containing bamboo crushed pieces and colorants, a stencil printing method, specifically, a bamboo screen using a rotary screen printing machine or a flat screen printing machine. Printing is carried out by conventional means using a screen type of a permeating mesh.

  In detail, when forming the print layer, first, at least a binder, a paste, the bamboo powder and a solvent are mixed to prepare a print paste. Usually, pigments and / or dyes are further mixed as color materials in the print paste.

  The content ratio of bamboo powder with respect to the total amount of print paste is not particularly limited as long as the object of the present invention is achieved. Usually, the content ratio of bamboo powder with respect to the total amount of the print layer after drying is within the range described below. For example, 1 to 300 g / L, particularly 5 to 100 g / L is preferable.

As the binder, paste, solvent, pigment, and dye, those conventionally used in the field of printed fabrics can be used.
As the binder, for example, synthetic resins such as acrylic emulsion and polyurethane, natural rubber, synthetic rubber latex and the like can be used.

  As the paste, for example, natural paste, synthetic paste, emulsion paste, and the like can be used.

  The solvent is not particularly limited as long as it can dissolve the binder, and water is usually used.

  As the coloring material, an organic or inorganic pigment is usually used, but an anionic dye such as a reactive dye, an acid dye, a direct dye, a cationic dye, or a disperse dye is used as necessary.

  After preparing the print paste, a print layer is formed on a cloth such as a cloth by a flat screen method, a rotary screen method or the like.

  It is preferable that the dough is previously exposed. Under-bleaching is a bleaching step using an oxidizing / reducing agent in addition to removing impurities and warp paste contained in cellulose fibers.

  After the print layer is formed on the dough, the dough having the print layer is baked to fix the bamboo powder and the pigment to the dough. As for baking temperature, 150-160 degreeC is suitable normally.

  After baking, if necessary, the fabric having the print layer is steamed to dye the dye. The steaming conditions are preferably 100 to 110 ° C.

  After the steaming, the fabric having the print layer is washed with water and dried. After washing with water, it is preferable to finish softly before drying.

The content ratio of bamboo powder with respect to the total amount of the printed layer after drying is not particularly limited as long as the object of the present invention is achieved, and is usually 0.1 to 30 g / m ² , particularly 0.5 to 10 g / m. ² is preferred.

(Examples 1-3 and Comparative Examples 1-3)
Hereinafter, the present invention will be described based on specific examples.
Examples 1 to 3 in Table 1 are implementation formulation examples based on the present invention, and Comparative Examples 1 to 3 are comparative formulation examples that verify the significance of the present invention.

  Bamboo powder A shown in Table 1 is a bamboo powder according to the present invention obtained by crushing a bamboo bran portion of a three-year-old bamboo shoot. The particle size distribution was 60% by number with a particle size distribution of 30 to 80 μm, and the average particle size was 50 μm.

  Bamboo powder B in Table 1 is a comparative bamboo powder obtained by crushing only the skin of the same third-year ginger Munetake and the portion close to the skin. The particle size distribution was 80% by number of 10 to 50 μm, and the average particle size was 10 μm.

  The O / W reducer in Table 1 is a conventional aqueous emulsion base paste (printing medium) having a 40:60 ratio of terpene and water containing 3% of a nonionic emulsifier.

  R / W Fixer 756K-1 (manufactured by Dainippon Ink Co., Ltd.) in Table 1 is an aqueous nonionic acrylic resin emulsion that is commonly used to bind bamboo powder and pigment to fiber fabrics. The amount necessary and sufficient for practical consumption performance is 1.5 to 2.0 times the concentration of pigment and bamboo powder.

  R / W Blue FF2R (manufactured by Dainippon Ink Co., Ltd.) in Table 1 is one of water-based pigment coloring materials that are commonly used to obtain color and pattern printed products.

  A predetermined amount of bamboo powder, a pigment and a fixer were added to the above reducer while stirring with a mixer, and finally a slight amount of water was added to adjust the viscosity for printing. The apparent viscosity of the obtained printing paste was 4000 to 5000 mPa · s (rotary viscometer R = 460 rpm, manufactured by Toyo Seiki Co., Ltd.).

100% cotton broad scouring, printing color paste containing the above bamboo powder on bleached fabric, using a regular flat screen printing machine, after baking at 155 ° C × 2 minutes, washed with water, After drying, a fabric product (printed fabric) having a printed layer containing bamboo powder for use in a functional evaluation test for verifying the present invention was prepared. The printing screen used was 800 mesh, opening 247 μm, aperture ratio 60%, thickness 115 μm, and transmission volume 69 cc / m ² .

  In Comparative Example 2, the fabric was subjected to the evaluation described later without forming a print layer.

(Evaluation)
The obtained printed fabric was evaluated for the following items, and the results are shown in Table 2.
・ Bamboo powder adhesion amount Measured the weight of the fabric before the printing process, the weight of the printing process, and the weight of the fabric after drying, calculated the chemical adhesion amount of the whole fabric, and calculated the bamboo powder adhesion amount on the fabric from the blending ratio of bamboo powder .

-Antibacterial test method: It was performed according to JIS L 1092 (antibacterial test method for textile products).
Test strain: Staphylococcus aureus Washing method: Washing based on JIS L 0217 103 method was performed a predetermined number of times. As the detergent, a JAFET standard detergent (detergent designated by the Textile Evaluation Technology Council) that does not affect the antibacterial evaluation was used.
Judgment method: According to the standards set by the Fiber Evaluation Technology Council, in the case of antibacterial and deodorant processed fiber products, if the bacteriostatic activity value is 2.2 or more, it is determined to be effective.

-UV shielding properties Evaluation was performed based on the average UV shielding rate and the UPF value. The transmittance measurement data is shown in FIG.
The average ultraviolet shielding ratio is obtained by measuring a ratio of shielding light of each wavelength in a wavelength range of 280 to 400 nm using a spectrophotometer, and calculating an average value of the shielding ratio in the wavelength range. It is a value that represents how much ultraviolet rays are shielded. Larger values are preferred.
The UPF value is a value measured and calculated by a method defined by the Australian / New Zealand standard (AS / NZS4399). This is a value calculated by measuring the shielding rate at a wavelength of 290 to 400 nm at intervals of 5 nm and taking into consideration the sensitivity of the skin and the relative energy of sunlight for each wavelength. Larger values are preferred.

Moisture absorption / release property A test cloth of 4.5 cm × 4.5 cm was dried in advance at 110 ° C. for 2 hours and weighed to obtain an absolute dry weight (W ₀ ). Next, it was placed in a thermo-hygrostat adjusted to a temperature of 30 ° C. and a humidity of 90% under high humidity conditions, and the weight (W _H90 ) was measured after 90 minutes. Subsequently, the sample was placed in a thermo-hygrostat adjusted to a temperature of 20 ° C. and a humidity of 65% under standard conditions, and the weight (W _S90 ) was measured after 90 minutes. The moisture content under high humidity conditions and the moisture content under standard conditions were calculated according to the following equations.
The moisture content of the under high humidity conditions _{= ((W H90 -W 0)} / W 0) × 100
Moisture content under standard conditions = ((W _S90 −W ₀ ) / W ₀ ) × 100

It is a graph which shows the measurement data of the transmittance | permeability in an Example and a comparative example.

Claims (1)

A fabric product having a printed layer containing bamboo powder obtained by crushing bamboo bamboo meat of bamboo.

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