JPH063286A - Gloss imparting agent to inspection target material surface - Google Patents

Abstract

PURPOSE:To provide a gloss imparting agent capable of giving a desired gloss to the surface of a material to be inspected in a surface inspection device by reverse reflecting screen. CONSTITUTION:In a gloss imparting agent for inspection target surface for giving a gloss to the surface of a material to be inspected which is subjected to surface inspection by use of a reverse reflecting screen, a liquid having a surface tension less than 40 dyne/cm, a viscosity of 1.0-50cps, and a contact angle with the inspection target surface less than 15 deg. is applied to the surface of the material to be inspected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gloss-imparting agent applied to make a surface of an object to be inspected glossy when performing a surface inspection using a retroreflective screen.

[0002]

2. Description of the Related Art For example, the surface inspection is important for products such as automobile outer panels where slight surface irregularities or wrinkles have a great influence on the product value. A surface inspection device using a retroreflective screen has been developed as a means for such surface inspection. According to this apparatus, the unevenness having a height of about 10 μm on the relatively flat surface can be optically emphasized, so that the existing position of the defect can be easily found and the defect can be quantitatively evaluated. . The basic structure of the surface inspection apparatus using the retro-reflection screen is as shown in FIG. 4, and the elements of the lamp 32 are arranged at relative positions so that the light of the lamp 32 hits the surface of the inspection object 33 and is reflected toward the retro-reflection screen 30. To be done. When the surface of the inspection object 33 is arranged between the retro-reflective screen 30 and the lamp 32, the lamp 32
Is reflected by the inspection object 33 toward the retro-reflective screen 30, this light is reflected by the retro-reflective screen 30 in the same direction as the incident optical axis, and is reflected again on the surface of the inspection object 33. It is captured by the camera 31 located at a position slightly distant from the lamp 32. In the image captured by the camera 31, the surface irregularities that cannot be seen with the naked eye are emphasized, and the position of the defect can be easily detected. In the surface inspection apparatus using the retroreflective screen outlined above, the surface of the inspection object 33 needs to have a certain level of gloss (surface roughness Ra = 0.05 μm or less). The glossiness is improved by applying a gloss-imparting liquid such as oil. FIG. 5 shows an outer plate 13 conveyed by a conveyor 6 from a press line 12 for manufacturing an outer plate of an automobile,
An example of a process of inspecting by the surface inspection device 10 using a retroreflective screen is shown, and the lamp 2, the camera 1, and the retroreflective screen 5 which are the components described above are provided, and the surface can be automatically inspected. Is configured. Since the surface of the pressed outer plate 13 has a low glossiness, it is difficult to make an inspection object as it is.
The gloss liquid is applied before it is conveyed to 0. That is, the rust preventive / cleaning oil is applied as a gloss liquid by the gloss liquid spraying device 8 arranged near the exit of the press line 12.

[0003]

The surface of the object to be inspected in the above-described surface inspection apparatus using the retroreflective screen is required to have a gloss of 70 or more, and a mirror surface that does not cause minute unevenness when the gloss liquid is applied. Need to be. In the above example, rust-prevention / cleaning oil is applied as a gloss liquid to the pressed steel sheet to obtain a certain degree of inspection suitability. However, a gloss-imparting agent that can improve the surface gloss ratio in a short time, the material of the inspection object It has been desired to develop a gloss-imparting agent suitable for such purposes. The present invention was developed to meet the above-mentioned demands, and an object of the present invention is to provide a gloss-imparting agent for a surface of an object to be inspected by a retroreflective screen that can obtain a required glossiness in a short time.

[0004]

In order to achieve the above object, the means adopted by the present invention is the gloss of the surface of the object to be inspected for giving a gloss to the surface of the object to be inspected using a retroreflective screen. In the imparting agent, the surface tension under the working environment is 40 dyne / cm or less, and the viscosity is 1.0 to 5
A 0 cps liquid with a contact angle of 1 with the surface of the inspection object
It is a gloss imparting agent for the surface of an inspection object, which is characterized by being 5 degrees or less.

[0005]

[Function] As for the physical properties of the gloss-imparting agent that can obtain the required glossiness in a short time, the liquid exhibiting low surface tension, low viscosity and low contact angle with the object to be inspected has good coatability and excellent smoothness. It was obtained by an experiment in which various liquids were applied to the surface of the object to be inspected to obtain a thin film surface and to immediately obtain the required surface glossiness. The specific values of the contact angle are measured by the droplet method with a direct reading contact angle meter at a working environment temperature of 20 ° C, and a smooth and good coating film is obtained when the contact angle with the surface to be inspected is 15 degrees or less. However, if the contact angle exceeds 15 degrees, cissing, crater, etc. occur and it becomes difficult to form a uniform coating film. In the physical properties of the gloss-imparting agent, when the surface tension is 40 Dyne / cm or more, cissing and craters occur on the film surface coated with the gloss-imparting agent, and a smooth mirror surface is not formed. Also, when the clay is 1.0 cps or less, when the gloss imparting agent is applied on the surface to be inspected, the liquid flows too much and it becomes difficult to form a mirror surface, and when the clay is 50 cps or more, the gloss imparting agent is applied. A pinhole is likely to occur on the film surface, and in order to prevent it, it takes time to increase the film thickness or to make it a mirror surface.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings for the understanding of the present invention. The following embodiments are examples of embodying the present invention and do not limit the technical scope of the present invention. Various luster imparting agents were applied to steel sheet panels as inspection objects in this example, and the results were compared and verified. The steel plate panel is 70 mm x 150 mm, and the following (1) to (4)
10 g of the liquid used as the example of the present invention and the comparative example of (5) to (7)
Was coated with an air spray gun, and the coating state was visually observed. (1) Aliphatic hydrocarbon solvent (Isoper L manufactured by Exxon Chemical Co., Ltd.) (2) Liquid paraffin (100-S manufactured by Chuo Kasei Co., Ltd.) (3) Leveling agent-silicone aliphatic hydrocarbon solvent (Isopar L manufactured by Exxon Chemical Co., Ltd.) System surfactant addition amount: 0.
03% (Bky-302 manufactured by Big Chemie Japan) (4) Aliphatic hydrocarbon solvent (Isopar L manufactured by Exxon Chemical Co.) Leveling agent-silicone oil 100 cps Addition amount: 1.0% (manufactured by Toray Silicone) (5) ) Xylene (6) Ethylene glycol (7) Isophorone The required physical properties of the liquids (1) to (7) are shown in Table 1 below, and the coating state of each liquid is shown in FIGS. In each figure, (a) is a cross-sectional view and (b) is a plan view. In FIG. 1, a perfectly smooth film surface is formed and the gloss ratio is high, and in FIG. 2, minute pinholes are present. 3 shows a state in which the film surface is not completely formed, and FIG. 3 shows a state in which cissing occurs and the film surface is not formed.

[Table 1] As a result of observing the state in which the liquids of (1) to (7) were applied to the steel sheet panel, the surface tension under the working environment was 40 dyne / cm or less and the viscosity was 1.0 to
It was concluded that a liquid of 50 cps and having a contact angle with a steel plate panel of 15 degrees or less is suitable as a gloss imparting agent.

[0007]

As described above, according to the present invention, a liquid having a surface tension of 40 dyne / cm or less and a viscosity of 1.0 to 50 cps in a working environment and having a contact angle with an inspection object of 15 degrees or less. By using such a liquid as a gloss imparting agent, it is possible to perform a more accurate and reliable surface inspection in a surface inspection device using a retroreflective screen.

[Brief description of drawings]

FIG. 1 is a cross-sectional view (a) and a plan view (b) showing a good coating state of a gloss-imparting agent according to an example of the present invention.

FIG. 2 is a cross-sectional view (a) and a plan view (b) showing a coating state in which a pinhole is formed by coating the gloss-imparting agent according to the embodiment.

FIG. 3 is a cross-sectional view (a) and a plan view (b) showing a coating state in which a gloss-imparting agent is applied as a comparative example and a film surface is not formed.

FIG. 4 is a perspective view showing a basic configuration of a surface inspection device using a retro-reflection screen.

FIG. 5 is a perspective view showing a specific example of surface inspection using a retroreflective screen.

[Explanation of symbols]

 1 --- Inspection object (steel plate panel) 2 --- Gloss-imparting agent

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koichi Ito 2-6-1, Nishi-Nagasu-cho, Amagasaki City Nard Institute Co., Ltd. (72) Inventor Yoei Mizue 2-6-1-1, Nishi-Nagasu-cho, Amagasaki-shi Nard Institute Co., Ltd.

Claims (1)

[Claims] 1. A gloss imparting agent for a surface of an object to be inspected, which is used for surface inspection using a retroreflective screen, wherein a surface tension in a working environment is 4 or less.
A gloss imparting agent for a surface of an object to be inspected, which is a liquid having a dyne / cm of 0 dyne / cm or less and a viscosity of 1.0 to 50 cps, and a contact angle with the surface of the object to be inspected is 15 degrees or less.