JPH0571697B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for drawing a pattern on the raised surface of a fabric having synthetic fibers.

[Prior art and problems]

BACKGROUND ART Conventionally, a method of pressing a heated embossing roller onto the surface of a fabric has been adopted as a method for creating patterns by creating irregularities on the surface of a fabric containing synthetic fibers.

However, if the heating temperature of the embossing roller is increased in order to sharpen the edges, the pressed area may become film-like, and even the periphery of the pressed area may contract and deform due to the radiant heat of the embossing roller.

Therefore, with the conventional method, it is difficult to depict a sharp uneven pattern with a delicate shape, and it is considered almost impossible, especially on thin fabrics.

In Japanese Patent Publication No. 58-3063, a synthetic fiber fabric with a colored pattern is irradiated with infrared rays at a temperature of about 100°C, and the heat generation difference caused by the difference in heat absorption between the colored patterns of different shades is used to create a melting depression difference in the synthetic fiber fabric. A method for creating a colored embossed pattern is described.

However, the embossed pattern is not drawn on the printed fabric that passes through an infrared irradiation device using a gas burner, an infrared lamp, etc.
Although the method disclosed in No. 58-3063 works as an idea, it cannot be put into practice.

[Object of the Invention] Therefore, an object of the present invention is to create a delicate and clear uneven pattern using a heating method, regardless of the thickness of the fabric, without causing any disadvantageous thermal deformation of the fabric.

[Structure of the invention]

The present invention achieves the above object by attaching graphite or carbon black to the raised surface of a fabric having synthetic fibers, and irradiating the raised surface with near-infrared rays (wavelength: 720 to 1500 mμ). The adhered graphite or carbon black is heated to generate heat, and the synthetic fiber napped to which graphite or carbon black is attached is thermally shrunk or melted through the generated graphite or carbon black, and the synthetic fiber napped is thermally shrunk or melted. It is characterized by drawing a design on the raised surface.

That is, the present invention is based on the knowledge that electromagnetic waves have the function of causing substances to generate heat, but the degree of heat generation varies depending on the substance, and that there are substances that generate heat at a much higher temperature than synthetic fibers. The knowledge that there are substances that generate heat even more strongly when exposed to electromagnetic waves of specific wavelengths, among other things,
Under near-infrared rays, a type of electromagnetic radiation that exists in the wavelength range of 720 to 1500 mμ, graphite or carbon black generates heat to a much higher temperature than other substances, and the degree of heat generation is higher than that of graphite or carbon black, regardless of the coloring density of the graphite or carbon black. This is due to the unique properties of a substance called carbon black, and was completed based on the knowledge that the heat generating properties of graphite and carbon black do not occur in wavelength bands other than near-infrared rays with wavelengths of 720 to 1500 mμ.

Therefore, in the present invention, graphite, carbon black, or other black carbon is used as a substance that generates heat at a much higher temperature than synthetic fibers, and it is also possible to conveniently use a pencil made of graphite.

In order to more effectively implement the present invention in terms of wavelength bands, it is recommended to apply near-infrared rays whose center wavelength is around 750 mμ, which is closer to visible light.

The near-infrared rays employed in the present invention will be explained as follows.

That is, infrared rays exist in an electrical frequency band of 10 ¹¹ Hz to 4×10 ¹⁴ Hz, and have a wide wavelength band of 0.72μ to 1000μ between visible light and microwaves.

Infrared rays existing in the wavelength band from 0.72μ to 1.5μ are called near-infrared rays, and from 1.5μ to 1.5μ
Infrared rays in the wavelength band up to 5.6μ are called mid-infrared rays, and infrared rays in the wavelength band from 5.6μ to 1000μ are called far infrared rays.

Near-infrared lamps, mid-infrared lamps, and far-infrared lamps are each classified and commercially available according to such differentiated wavelengths.

In the present invention, a lamp that emits near-infrared rays from 0.72μ to 1.5μ is used, and in particular, 0.75μ
It is recommended to use a near-infrared irradiation lamp whose main wavelength is around (750 mμ) and irradiate from a close distance of 10 cm or less.

As explained above, graphite or carbon black used in the present invention belongs to black substances, but not all black substances or dark-colored substances are applicable to the present invention as a medium for heating synthetic fibers. The invention is limited to graphite or carbon black, and even if it is a black substance or a dark-colored substance, the present invention cannot be carried out using substances other than graphite or carbon black.
The intended purpose of the invention is not achieved.

That is, in the present invention, "adhering graphite or carbon black to the nap of synthetic fibers" does not mean "coloring the synthetic fibers black or dark colors."

Therefore, the amount of graphite or carbon black to be attached to the synthetic fibers may be as small as 0.1 wt% owf or less, which is enough to not color the synthetic fibers. The graphite or carbon black may be colored extremely deep or black in advance with a coloring agent (dye) other than graphite or carbon black to such an extent that it will not be colored. There is no need to wash and remove the fabric after irradiation, and the effects of the present invention occur almost independently of the color and shade of the fabric, which is a very remarkable feature of the present invention.

Specifically, when near-infrared rays are irradiated from a close distance of 10 cm or less, the amount of graphite or carbon black attached to the nap of the synthetic fiber may be about 0.1 wt % owf, which does not particularly color the synthetic fiber.

The synthetic fibers to which the present invention is applied include nylon, acrylic fibers, polyester fibers, vinylon fibers, etc., and the types thereof are not limited.

Graphite or carbon black may be directly attached to the synthetic fiber as it is by scattering its powder, or may be applied together with a binder.

For example, when using a pencil made of graphite or carbon black, draw the desired design by running the pencil across the surface of the nap fabric until the graphite or carbon black, which is the material of the pencil lead, is lightly attached.
When passed under a near-infrared lamp, the synthetic fibers coated with graphite or carbon black shrink due to heat, creating a concave-convex pattern in which the pencil-drawn design becomes concave and other areas convex. In this way, special equipment such as a textile printing machine or a printing machine is not required to attach graphite or carbon black to synthetic fibers, and therefore, the present invention can be carried out easily.

In the present invention, graphite or carbon black is not used to color synthetic fibers, but as a medium for heating synthetic fibers.
After its use, it may be washed off the fabric.

The degree to which the synthetic fibers are heated depends on the amount of near-infrared irradiation (the distance between the irradiation device and the synthetic fibers and the irradiation time), the amount of graphite or carbon black attached, a heat-resistant additive that prevents changes due to heating of the synthetic fibers, or This can be controlled using a change accelerator that accelerates the change caused by heating.

As the heat-resistant aid, flame retardants such as aluminum hydroxide, melting inhibitors such as silicone rubber and other reactive silicon compounds, and foaming agents such as diazocarbonamide are used.

These heat-resistant aids, especially reactive silicon compounds applied as melt-inhibiting agents, are capable of causing heat shrinkage without reducing the degree of crystallinity of the polymers that compose synthetic fibers, and of maintaining the strength of synthetic fibers after shrinkage. You can use it if you want.

Reactive silicone compounds that can be used for this purpose include dimethylpolysiloxane, methylhydrodienepolysiloxane, epoxy-modified dimethylpolysiloxane, and amine-modified polysiloxane.

As the change accelerator, an alkaline or acidic corrosive agent that corrodes synthetic fibers, such as caustic soda (alkali) for polyester fibers, is used.

The raised fabrics to which the present invention is applied include raised tricots, raised knits, moquettes, electrostatic flocked fabrics, and the like.

Hereinafter, this will be explained in detail using examples.

〔Example〕

Acrylic emulsion resin (solid content 40%) 35
The brushed surface of a brushed fabric with a basis weight of 450 g/m ² is made by kneading 33 parts by weight of mineral turpentine, 0.5 parts by weight of carbon black, and 31.5 parts by weight of water with polyester fibers. Printing was performed using a screen printing machine to a layer basis weight of approximately 45 g/m ² ).

Next, after drying the coating film, the main wavelength
A cylindrical near-infrared lamp with an output of 2kw (2kw/m) per unit length (m) that emits near-infrared rays of around 750mμ is passed through a close distance of 50mm at a speed of 5m/min, and the carbon black imprint is printed. The area was irradiated with near-infrared rays.

As a result, only the brushed fluff coated with carbon black melted and shrunk and fused to the base of the brushed fabric, and as the polyester fibers melted and contracted and became thicker, darkened recesses were formed on the brushed surface. .

On the other hand, the raised fluff that was not coated with carbon black remained as it was and became a convex portion.

In this way, a fabric was obtained in which a sharp uneven pattern suitable for latticework was drawn on the raised surface.

FIG. 1 is a photograph showing the fabric thus obtained, enlarged three times. Figure 2 is an 80x magnification micrograph showing the boundary between the areas of the fabric where the paint was applied and the areas where the paint was not.

〔Effect of the invention〕

The effects of the present invention occur as follows.

(1) The raised surface is not directly heated by a heating device such as an embossing roller, but is indirectly heated by near-infrared rays via graphite or carbon black attached to the raised surface. Therefore, the raised fluff in the area where graphite or carbon black is not present is not heated and does not shrink or melt in the same way as the raised fluff where graphite or carbon black is present.

(2) Graphite or carbon black can be applied to very small and limited areas.

For this reason, it is possible to heat only a very small part of the napped surface, and it is therefore possible to create uneven patterns with fine patterns and sharp edges, and the entire napped fabric is not heated, making it possible to heat graphite or carbon. Since only the part where the black is attached is indirectly heated, it is also possible to draw designs on extremely thin raised fabrics.

(3) Graphite or carbon black is not used to color synthetic fibers, but as a medium to heat synthetic fibers, and the amount of graphite or carbon black applied is 0.1% by weight, which is enough to not color synthetic fibers.
A trace amount of less than wf is sufficient, and it can be deposited by a printing device.

Therefore, by using a printing device to print an uneven pattern by printing graphite or carbon black without coloring the periphery of the pattern drawn with dyes or pigments other than graphite or carbon black, it is possible to create a three-dimensional and colorful pattern. It is possible to obtain a raised fabric that is innovative in terms of design.

(4) Graphite or carbon black generates heat high enough to heat and deform synthetic fibers only when intensely irradiated with near-infrared rays from a close distance.
A small amount of near-infrared rays contained in sunlight or light from lamps deforms synthetic fibers and does not generate much heat.

Therefore, even if graphite or carbon black remains attached to the raised fabric treated according to the present invention, it does not pose any practical problem. A subsequent wash-off is not necessarily required.

(5) Graphite or carbon black is not used to color the raised fabric, and the raised fabric to which the present invention is applied may contain coloring agents other than graphite or carbon black to the extent that it is not colored by graphite or carbon black. The fabric may be colored in advance in an extremely dark or black color using a dye (dye), and the above effect occurs almost regardless of the color or shade of the fabric.

[Brief explanation of drawings]

FIG. 1 is an enlarged photo of the fibers on the surface of the napped fabric according to the example, and FIG. 2 is a partially enlarged microscopic photo of the fibers on the surface of the napped fabric according to the example.

Claims (1)

[Scope of Claims] 1 (a) Partially attaching graphite or carbon black to the raised surface of a fabric having synthetic fibers, (b) Injecting near infrared rays (wavelength: 720 to 720) to the raised surface of the fabric.
1500 mμ) to heat the adhered graphite or carbon black to generate heat; (c) heat-shrink or melt the synthetic fiber naps to which the graphite or carbon black has adhered through the heated graphite or carbon black; (d) A method for patterning a synthetic fiber napped fabric, characterized by: (d) creating an uneven pattern on the napped surface by heat shrinking or melting the napped synthetic fibers. 2. A method for patterning a synthetic fiber napkin fabric according to claim 1, characterized in that the adhesion of graphite or carbon black is carried out using a printing machine. 3. A method for patterning a synthetic fiber napkin fabric according to claim 1, characterized in that graphite or carbon black is applied by drawing a pattern with a pencil.