KR20020027890A - A process of preparing open lens typed reflective materials - Google Patents

Abstract

PURPOSE: A method for fabricating an open type recursive reflection material is provided, which improves friction endurance by improving brightness of the recursive reflection material and adhesion with a fiber base film. CONSTITUTION: According to the method, a water-soluble adhesive(2) as thick as 20-30 micrometers is coated on a base film(1). And after spraying a glass beads(3) on the water-soluble adhesion, an aluminum is deposited thereon. After coating an adhesive resin(5) on the glass beads deposited with the aluminum, a fiber base film or a film base film(6) is laminated. Thus, the water-soluble adhesive and the base film are laminated by rising the above stacked body with a water. The water-soluble adhesive is a water-soluble transparent acrylic resin, and a diameter of the glass beads is 45-50 micrometers. And the adhesive resin is a polyurethane resin.

Description

A process of preparing open lens typed reflective materials

The present invention relates to a method of manufacturing an open lens retroreflective material having excellent luminance. Retroreflective material is a material for retroreflecting incident light at the same direction as the incident direction or at the same angle, and is widely used for traffic signs, safety signs, and clothing. The surface shape of the retroreflective material is divided into a close lens type mainly used for traffic signs and safety signs, and an open lens type mainly used for clothes.

Closing lens type is a form in which glass beads are covered with thick transparent resin and have a flat surface. As a result of the transparent resin covering the beads, the cloth lens type is excellent in friction and washing durability, but the retroreflective performance in a blind spot is poor. In addition, cloth lens type is thick and drape, so it can not be used for clothing is used only for traffic signs, such as limited.

On the other hand, the open lens type is relatively easy to manufacture because there is no transparent resin layer covering the beads, and excellent in retroreflective performance in square, and its safety is sufficiently secured even if the angle of incidence of light changes depending on the mobility. It is also thin and draped, making it ideal for use as clothing. However, such open lens type is hemispherical in shape because the beads protrude, there is a weak durability for friction and washing. In order to compensate for the durability problem, many researches have been conducted on the strong adhesive resin which can greatly improve the adhesive strength between the fiber base or the film base 6 and the beads. It is not working.

For example, Japanese Patent Application Laid-Open No. 57-149577 proposes a method of using a solid saturated polyester resin as an adhesive component, which has excellent adhesion and feel. There is discomfort. In addition, the open lens retroreflective material is formed not only on the beads but on the entire resin layer supporting the beads. As a result, light reflection and scattering occurred, and thus there was a limit in expressing excellent luminance value.

An object of the present invention is to provide a method of manufacturing an open lens retroreflective material having good friction and washing durability and excellent luminance. To this end, the present invention is characterized in that the aluminum deposition layer 4 is formed only on the hemispheres of the beads. The aluminum vapor deposition layer 4 formed in the hemisphere of the beads improves the luminance value of the retroreflective material and also improves the adhesiveness with the fiber substrate, thereby improving the friction durability.

1 is an enlarged cross-sectional view of an open lens retroreflective material manufactured by the present invention.

Fig. 2 is an enlarged cross-sectional view of a laminate (pre-washing state) manufactured through steps 1 to 3 of the present invention.

※ Explanation of code of main part of drawing

1: base film 2: water-soluble adhesive

3: glass beads 4: aluminum deposition layer

5: adhesive resin 6: fiber base or film base

The method of manufacturing the open lens retroreflective material of the present invention for achieving the above problems is (i) a step of coating the water-soluble adhesive (2) on the base film (1) to a thickness of 20 ~ 30㎛ (first step) (Ii) spraying glass beads (3) on the water-soluble adhesive and then depositing aluminum thereon (second step), (i) adhesive resin (5) on the aluminum-deposited glass beads (3) (3) step of laminating the fibrous base or the film base 6 thereon after coating and (iii) the step of washing the laminate thus prepared to peel the water-soluble adhesive (2) and the base film (1). And (fourth step).

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

First of all, the present invention coats the water-soluble adhesive 2 on the base film 1 with a thickness of 20 to 30 μm (first step). In coating, a comb coater is used. At this time, a polyester film, paper, etc. are used as a base film, and a water-soluble transparent acrylic resin is used as a water-soluble adhesive. The thickness of the base film is preferably about 25㎛. If the non-fiber substrate film 6 is laminated on the aluminum deposition layer 4 in the third step below, it is preferable to use a water-soluble material such as paper as a base film to easily dissolve the water-soluble adhesive by washing with water. desirable. After laminating a release film on the base film 1 to which the water-soluble adhesive agent 2 was coated, they are wound up. In the next step, the release film is peeled off, and then the glass beads 3 are sprayed onto the water-soluble adhesive 2 coated on the base film 1. Alternatively, the glass beads 3 may be sprayed thereon immediately after coating the water-soluble adhesive 2 on the base film 1 without laminating and peeling off the release film. It is preferable that the diameter of the glass beads 3 used at this time is 45-50 micrometers.

Subsequently, aluminum is deposited on the sprayed glass beads 3 to form an aluminum deposition layer 4 on the glass beads surface (second step).

Subsequently, the adhesive resin 5 is coated on the aluminum deposition layer 4, and then the fiber base or the film base 6 is laminated thereon to prepare a laminate (third step). The laminate thus produced has a cross-sectional state as shown in FIG. In this case, a polyurethane resin or the like may be used as the adhesive resin, and a fabric or the like may be used as the fiber substrate. The adhesive resin 5 may be applied to the entire surface of the aluminum deposition layer 4 by a comb coater, or may be partially coated in a specific design shape by using a gravure roller having irregularities on the surface thereof. In the case of partially applying the adhesive resin on the aluminum deposition layer 4, the retroreflective material is laminated only on the portion of the fibrous substrate or the film substrate 6 to which the adhesive resin is applied. In this case, it is very convenient to omit a separate sewing or hot-melt operation of the retroreflective material, such as fabric.

As described above, the fibrous substrate or the film substrate 6 is laminated on the aluminum deposition layer 4 with the adhesive resin 5, and then washed with water to remove the water-soluble adhesive 2 and the base film 1 to form a final open lens. A type retroreflective material is manufactured (step 4). When the laminate as shown in FIG. 2 is washed with water, the water-soluble adhesive 2 in FIG. 2 is dissolved by water, and the base film 1 naturally peels off. The cross-sectional state of the product after washing is as shown in FIG.

In the present invention, since the aluminum deposition layer 4 is formed on the hemisphere surface of the glass beads 3, a superior luminance value can be expressed, and adhesion to the fiber base is improved, and washing and friction durability are also improved. Can be.

In the present invention, the luminance value of the retroreflective material was measured by the JIS 9117 method, the friction fastness was measured by the KSK 0605 method, the distance at night time was measured at an angle of 90 °.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. However, the present invention is not limited only to the following examples.

Example 1

A transparent acrylic resin is coated on the polyester film using a commer coater to a thickness of 25 μm, sprayed glass beads having a diameter of 45 μm on the polyester film, and aluminum is deposited thereon to form an aluminum deposition layer. Partial coating of a polyurethane resin using a gravure roller on the aluminum deposition layer and then laminating the fabric thereon to prepare a laminate as shown in FIG. Subsequently, the laminate is washed with water to produce an open lens retroreflective material as shown in FIG. 1. The results of evaluating the physical properties of the prepared retroreflective material are shown in Table 1.

Example 2

A transparent acrylic resin is coated to a thickness of 30 μm on the polyester film by using a commer coater, and glass beads having a diameter of 50 μm are sprayed thereon, and aluminum is deposited thereon to form an aluminum deposition layer. The front surface of the polyurethane resin is coated on the aluminum deposition layer by using a commer coater, and then a film substrate is laminated thereon to prepare a laminate as shown in FIG. 2. Subsequently, the laminate is washed with water to produce an open lens retroreflective material as shown in FIG. 1. The results of evaluating the physical properties of the prepared retroreflective material are shown in Table 1.

Comparative Example 1

A solvent-type dry polyurethane resin solution mixed with an aluminum plate on a polyamide fabric was coated with a thickness of 25 μm, and the front surface was coated with a water-soluble polyurethane resin solution containing 50% by weight of glass beads, followed by washing with water. An open lens retroreflective material is manufactured. The results of evaluating the physical properties of the prepared retroreflective material are shown in Table 1.

Property evaluation result of retroreflective material division Luminance value Night viewing distance (m) Raw materials 30 times of washing Friction 200 Example 1 98 150 120 130 Example 2 96 145 120 125 Comparative Example 1 70 120 90 85

The retroreflective material produced by the method of the present invention is an open type, which is particularly excellent in luminance value, and also has good washing and friction durability. Therefore, it is very useful for clothing. In addition, in the present invention, the adhesive resin may be partially coated with a gravure roller to directly laminate the retroreflective material on a fiber substrate or the like in a desired design form.

Claims (5)

Method for producing an open lens retroreflective material comprising the following steps. -Below- (Iii) coating the water-soluble adhesive 2 on the base film 1 to a thickness of 20 to 30 µm (first step), (Ii) spraying glass beads 3 on the water-soluble pressure-sensitive adhesive and then depositing aluminum thereon (second step), (Iii) coating the adhesive resin 5 on the glass beads 3 on which aluminum is deposited, and then laminating the fibrous base or the film base 6 thereon (third step); (Iii) The process of water-washing the laminated body manufactured in this way and peeling a water-soluble adhesive 2 and a base film 1 (4th process). The method for producing an open lens retroreflective material according to claim 1, wherein the water-soluble adhesive is a water-soluble transparent acrylic resin. The method of manufacturing an open lens retroreflective material according to claim 1, wherein the glass beads 3 have a diameter of 45 to 50 µm. The method of manufacturing an open lens retroreflective material according to claim 1, wherein the adhesive resin (5) is a polyurethane resin. The method of manufacturing an open lens retroreflective material according to claim 1, characterized in that the adhesive resin (5) is partially coated on the glass beads (3) on which aluminum is deposited with a gravure roller.