JPH041032A - Stretchable flocked material - Google Patents

Abstract

PURPOSE:To obtain a flocked material simultaneously satisfying stretchability, air permeability, flexibility and wearing comfortability and formed into beautiful flocked cloth by merely superposing the same on cloth to be covered under heating and pressure by flocking the surface of a specific nonwoven fabric composed of a fiber of an elastic hot melt resin with a staple fiber group. CONSTITUTION:The melting temp. of an elastic hot melt resin is 150 deg.C or lower and a nonwoven fabric composed of the fiber of the elastic hot melt resin has stress at the time of 100% elongation of 250g/cm or less and 100% stretch recovery of 85% or more. The wt. basis of the hot melt nonwoven fabric to be used is pref. within the range of 40 - 160g/m<2>. When the basis wt. is below 40g/m<2>, fiber density is high and voids become too many and it becomes difficult to perform the uniform and dense flocking with staple fibers without generating spots and, when the basis wt. exceeds 160g/m<2>, no pref. effect is obtained because an obtained flocked material becomes inferior to air permeability or flexibility.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a flocked body, and more particularly to a stretchable flocked body that can be suitably used as a marking area for sports clothing.

(Prior technology) Using a sheet material such as woven or knitted fabric, non-woven fabric, paper, film, or foam as a base material, single fibers made of natural or synthetic fibers are flocked onto the base material by vibration method or electrostatic flocking method. It is known to obtain such a flocked sheet, and it is also common practice to use this flocked sheet as a surface material for clothing, bags, ornaments, and the like.

For example, the present applicant has previously proposed in Japanese Patent Laid-Open No. 60-2353 a stretchable flocked fabric in which short non-elastic fibers are flocked after applying an adhesive to a polyurethane elastic nonwoven fabric. Further, Japanese Patent Publication No. 53-5347 discloses fabrics such as wasobean, which are made by flocking short fibers onto a polyamide thermoadhesive resin film via an adhesive.

(Problems to be Solved by the Invention) When laminating the flocked fabric disclosed in JP-A-60-2353 on other fabrics, synthetic leather, foam, etc., it is necessary to use an adhesive. In addition to increasing the number of coating steps, it also requires advanced and difficult techniques to select an adhesive that does not impair the flexibility and elasticity of the polyurethane elastic nonwoven fabric that is the flocked base fabric, and to apply the adhesive. On the other hand, the special public official 1973-534
In the flocked body described in Publication No. 7, the short fibers can be directly bonded to the adherend film using a thin adhesive layer without using a base fabric for flocking, and the flocked body without a thick feeling can be created. However, since the adhesive sublayer is formed in the form of a film, the resulting flocked body has no air permeability, and the adhesive resin film is made of polyamide. Therefore, it has the disadvantage of having almost no elasticity. Therefore, when this flocked body is attached to clothing as a mark, the elasticity of the attached part is impaired, and free movement of the body is hindered, giving an uncomfortable feeling when worn. This drawback becomes especially noticeable when such non-stretch flocked materials are attached to the fabric of sports clothing that stretches vertically and horizontally, such as athletic shirts, uniforms, and leotards, and the difference in elasticity between the two causes the marked area to tighten. occurs, which in turn promotes peeling of the marked area.

The present invention simultaneously satisfies the properties of stretchability, breathability, flexibility, and wearing comfort that conventional flocked materials have not been able to achieve, and allows beautiful flocked materials to be created simply by overlapping the adherend fabric and heating and pressing. The purpose is to provide flocked bodies from which fabrics can be obtained.

(Means for solving the problem) That is, the elastic flocked body of the present invention is made of fibers of an elastic hot melt resin, and has a melting temperature of 150''cB or less.
It is characterized in that short fibers are flocked on the surface of a nonwoven fabric having a stress at 100% elongation of 250 g/cm or less and an elongation recovery rate after 100% elongation of 85% or more. The present invention will be explained in detail below.

The elastic hot melt resin used in the present invention includes, for example, polyurethane, ethylene-vinyl acetate copolymer or its partial hydrolyzate, ethylene-acrylic ester copolymer, styrene-butadiene-styrene block copolymer, etc. Thermoplastic elastic resins with relatively low melting temperatures are acceptable.

If necessary, the elastic resin may be given an adhesive finish, wax, or
It may also contain plasticizers, stabilizers, etc. All of these materials are required to have melt fluidity and thermal stability that enable normal melt spinning.

The melting temperature of the above-mentioned elastic real-melt resin must be 150'C or lower.6 This is because, as will be described later, when this is used as a base material for flocking and as an adhesive to be heat-bonded to clothing fabric as an adherend, This is because raising the temperature more than necessary is uneconomical and gives an excessive thermal history to the adherend and short fibers for flocking, making it difficult to maintain their morphology and physical properties.

In addition, in order for the flocked body of the present invention to have sufficient elasticity when adhered to an adherend, the nonwoven fabric made of the fibers of the elastic hot melt resin must have a stress at 100% elongation of 250 g/cm or less. and 100% of 85% or more
The elongation recovery rate must be determined. This is because when the flocked body of the present invention is attached to clothing fabric, the degree of elongation of the clothing fabric that is stretched due to body movement is considered to be about 100% at most, and the flocked body is stretched to the same degree. In order to be able to wear it with virtually no resistance when stretched, the stress at 100% elongation of the long-fiber real melt nonwoven fabric, which is the flocked base material, must be 2.
50 g/cm or less, and furthermore, it is important for the feeling of wearing that the flocked body quickly recovers from elongation as the clothing loosens, and it must have high elongation recovery performance as described above. This is because it is necessary.

The method of processing the above-mentioned elastic hot-melt resin into a hot-melt nonwoven fabric involves melt-spinning the resin and thinning and stretching the spun fibers using hot air blown from separate wave channels in the spinneret, at a distance of a certain distance from the spinneret surface. A melt injection spinning method (also known as a melt blow method) can be advantageously employed in which a nonwoven fabric is obtained at once by bonding fibers together using the self-fusing properties of the resin on a collection net set up at a certain distance. The nonwoven fabric made of long fibers obtained in this way has isotropic elasticity within a practical range, and can be stretched easily in all directions, and is self-bonding, so a binder for adhesion between the fibers cannot be used. Therefore, the texture is extremely soft and suitable. Due to these advantages, when this nonwoven fabric is attached to an adherend fabric as a base material for a mark, it can easily follow the elongation of the fabric.

The basis weight of the hot melt nonwoven fabric used in the present invention is 40
Preferably it is in the range of ~160 g/m2. If the basis weight is less than 40 g/m2, the fiber density will be coarse and there will be too many voids, making it difficult to plant short fibers evenly and densely. On the other hand, if the basis weight is 160 g/m2, the air permeability of the flocked body This is undesirable because it results in poor flexibility.

Next, a method for flocking short fibers onto the surface of a hot melt nonwoven fabric will be explained. First, a flocking adhesive is applied to the surface of the nonwoven fabric. Adhesives include synthetic rubber, aryl,
Using a type such as urethane that does not impair the flexibility and elasticity of the flocked material, the solution or emulsion is applied or sprayed to maintain the air permeability of the flocked base fabric. In this case, the amount of adhesive applied should be kept to the minimum necessary in order to maintain the above-mentioned excellent performance of the flocked body such as flexibility, and also in consideration of economic efficiency. 20g/m
" is suitable.Next, short fibers made of natural or synthetic fibers such as cotton, nylon, polyester, olefin, rayon, etc. are flocked onto the surface of the nonwoven fabric to which the adhesive has been attached.The known vibration method is used as the flocking method. , electrostatic method, etc. can be applied.

Electrostatic method is preferable to flock uniformly and densely, for example, short fiber pile is flocked under a voltage of about 30,000 volts or more, and then baked at a temperature of 100°C or more and below the melting temperature of hot melt nonwoven fabric. Bye.

(Operations and Effects) The structural feature of the flocked body of the present invention is that short fibers are flocked with an adhesive on the surface of an isotropically stretchable real-melt nonwoven fabric. In other words, the pot-melt nonwoven fabric functions both as a flocked base fabric and as an adhesive for the adherend. Therefore, by cutting the flocked body of the present invention into, for example, a patch shape, stacking it on the adherend fabric, and heat-bonding the flocked body side or the adherend side using a heat press machine, iron, etc.,
A flocked fabric in which short fibers for flocking are closely fixed on an adherend can be obtained.The effects of the flocked body of the present invention are listed as follows.

■ The flocked body expands and contracts freely in all directions, so when a patch/mark fabric made from it is attached to clothing, the patch/mark fabric can fully follow the elongation of the garment due to body movements, making it look completely strange. You can wear it without any problems. Especially the larger the shape of the patch/mark (for example, 10cm or more)
, this effect is clearly exhibited.

■ Because the true melt nonwoven fabric that serves as the base fabric for the flocked body uses a thin type with a relatively small basis weight, even if its constituent fibers melt and deform when bonded to the adherend, they do not completely form into a film and still have pores. Therefore, breathability is not impaired.

■ When this flocked body is attached to an adherend using a press machine, iron, etc., air bubbles can be easily removed when pressed because this flocked body has air permeability, and there are no defects that can be seen when pasting with a film-type hot melt. No adhesive portion remains and the entire surface can be reliably bonded.

■ Because the base fabric of the flocked body is fibrous, it melts more easily than film-type hot melt, requires less time to attach, and can suppress excessive heat history to the flocked short fibers.

(Example) JIS A hardness 75, breaking strength 210 kg/cm",
Breaking elongation 820%, 100% elongation modulus 43kg/
Adipate-based thermoplastic polyurethane resin having physical properties of flow start temperature 126°C and apparent viscosity 870 poise at 19°C using a Koka type flow tester was melt-blown at a spindle temperature of 190°C to obtain a fabric weight of 74 g/cm.
A real-melt nonwoven fabric having a size of 1.5 m was obtained.

The physical properties of this nonwoven fabric according to JIS L-1096 were
Shown in the table.

Next, an acrylic-vinyl acetate copolymer resin emulsion adhesive was applied to the true-melt nonwoven fabric using a doctor knife so that the amount of pure adhesion was 15 g/m''.

Red polyester short fibers with a cut length of 1.2 mm were electrostatically flocked onto this surface under a voltage of 40,000 volts,
A stretchable flocked body was prepared by heat curing (baking) at ℃ for 15 minutes.

The physical properties of this flocked body are shown in Table 2.

Uniform uniform numbers are made from this flocked material and heat-pressed onto the back of sports shirts at 130℃ x 0.4 kg/
It was attached under the adhesive conditions of cm" x 3 Q seconds.

When I tested wearing this shirt, the part of my back that corresponds to my uniform number stretched easily during rapid body movements, and I didn't feel any discomfort at all.

Claims (1)

[Claims] Made of elastic hot-melt resin fibers, with a melting temperature of 150°C or less, and a stress of 250g/cm at 100% elongation.
Hereinafter, a stretchable flocked body in which short fibers are flocked on the surface of a nonwoven fabric having a 100% elongation recovery rate of 85% or more.