JPH05188003A - Manufacture of long-sized molded product - Google Patents

Abstract

PURPOSE:To provide a manufacturing method of a long-sized molded product, which is capable of securely detecting the condition of the primer coating without mixing a dye or the like in the primer. CONSTITUTION:A plurality of slit beams consisting of the colors which are easily discriminated from the color of a work (W), have sharp edges and equal pitches are projected in the diagonal direction relative to the primer coated surface 18 of the work (W) by means of a light source 11, an irregular reflex plate 12, a color filter 13 and a slit plate 14. The condition of the primer coating is detected on the basis of the difference of the reflection factor of the slit beams by means of a color camera 15 arranged in the vertical direction relative to the primer coated surface 18 of the work (W), an image processing device 20 and a CRT display device 25. This arrangement allows mixing of a dye or the like in the primer to be unnecessary, and at the same time, allows the condition of the primer coating of the work which is a long-sized molded product to be easily and securely detected under a normally bright working environment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a long molded article, and more particularly to a method for producing a long molded article for detecting the application of a liquid substance and its state.

[0002]

2. Description of the Related Art Conventionally, in automobiles and the like, a molding having a protective effect and the like is formed by an extruder using a soft resin such as vinyl chloride. This molding is attached to the side surface of the automobile or the like via an adhesive or a double-sided adhesive tape. In the production of the molding, on the coated surface of the adhesive or the like, first, to improve the surface accuracy by eliminating fine irregularities on the surface of the material, to strengthen the adhesive force when using the adhesive, usually, A primer, which is a liquid substance, is applied as the undercoat. Here, the primer is applied to the entire surface of the application surface of the molding adhesive or the like, so that the application step is continuously performed after the extrusion molding step. At this time, an appropriate dye or the like is mixed in the primer in order to determine whether or not the primer has been applied to the entire surface. Molding, which is a long molded product, is manufactured by a method of detecting the coating state of the primer by visual inspection.

[0003]

As described above, the use of a dye or the like unrelated to the original purpose of the primer, such as for eliminating fine irregularities on the surface of the material, in the primer is costly. In addition to the above, there is a problem that the types of the primer and the dye are restricted so as not to lower the adhesive strength.

The present invention has been made in order to solve the above problems, and its purpose is to reliably detect the applied state of a primer without mixing a dye or the like into a liquid substance such as a primer. It is to provide a method for producing a long molded product that can be manufactured.

[0005]

The structure of the invention for solving the above-mentioned problems is a long-length molded article that is extrusion-molded, a liquid substance is applied to at least one surface of the long-length molded product, and the application state of the liquid substance is detected. In the method for producing a long molded article, slit light is projected from an oblique direction with respect to the coating surface of the liquid substance of the long molded article, and the reflectance of the slit light on the coated surface of the long molded article The application state of the long molded product is detected based on the difference.

[0006]

The slit light is projected obliquely with respect to the surface of the long molded product on which the liquid substance is applied, for example, in the width direction of the long molded product with a sharp edge in a color that is easily distinguishable from the long molded product. Be illuminated. Then, the coating state of the liquid substance is detected, for example, by the difference in the reflectance of the slit light in the vertical direction with respect to the coating surface of the long molded product. That is,
If the application state of the liquid substance on the coated surface of the long molded product is good, the sharp edge of the projected slit light can be clearly confirmed on the coated surface of the long molded product coated with the liquid substance as it is. Become.

[0007]

EXAMPLES The present invention will be described below based on specific examples. FIG. 1 is a schematic diagram showing the overall configuration of an inspection apparatus using the method for producing a long molded product according to the present invention. In the arrow direction from left to right in the drawing, a work W of a long molded product, which is a molding made of vinyl chloride extruded by an extruder (not shown), is conveyed and moved.
On the work W, a primer which is a liquid substance in the previous step is applied to the primer application surface 18 indicated by the flat portion (mesh display portion) on the upper surface. A light source 11 such as a halogen lamp, an irregular reflection plate 12 such as frosted glass, a color filter 13 and a slit plate 14 are provided on the upper left of the conveying surface of the work W, and the slit light is projected onto the primer application surface 18 of the work W. It is shining. The light emitted from the light source 11 is
The diffuse reflection plate 12 provides light having a substantially uniform brightness per unit area. Further, the color filter 13 provided on the rear surface of the diffuse reflection plate 12 makes the light from the light source 11 have a wavelength in a uniform specific band that is easy to confirm with respect to the surface color of the work W. Here, as the color of light projected onto the surface of the work W, white is suitable when the surface color of the work W is black, and red is suitable when the surface color of the work W is white. As shown in the front view of FIG. 3, the slit plate 13 is a thin metal plate having a sufficient length in the width direction of the work W and formed with a plurality of parallel slits at equal pitches. ing. An optical black coating is applied so that unnecessary reflection does not occur at the slit end surface of the slit plate 13.

The slit light projecting surface of the primer application surface 18 of the work W is imaged by the color camera 15 arranged in the direction perpendicular to the primer application surface 18 of the work W. still,
When the moving speed of the work W is fast, the color camera 1 with an electronic shutter is provided so that the captured image is not blurred.
5 is used. The video signal from the color camera 15 is read by the image processing device 20 at a predetermined sampling time, and the result is displayed on the screen of the CRT display device 25 as shown in FIG. The image processing device 20
Is mainly composed of an A / D converter 21, a CPU 22, a ROM 23 storing a control program, and a RAM 24 storing image data and the like.

Next, the CP used in the apparatus of this embodiment.
The operation will be described based on the flowchart of FIG. 2 showing the processing procedure of U22. The program is repeatedly executed at a predetermined sampling time. First, in step 100, initialization is executed as initialization. Next, in step 102, the color camera 1
The video signal from 5 is converted from an analog signal into a digital signal by the A / D converter 21 and read. Next, in step 104, the duty ratio of the portion of the primer application surface 18 where the brightness of the slit light is equal to or higher than a predetermined value in the moving direction of the work W is calculated.
It should be noted that the good or bad primer coating state does not occur in spots, and if the primer coating state becomes poor, it will cover the entire primer coating surface 18, so that the coating state at only a predetermined position as described above should be detected. The purpose is achieved in. When the work W is coated with the primer, a sharp edge is formed by the slit light and the duty ratio is large, and when the work W is not coated with the primer, the slit light is diffusely reflected on the surface of the substrate of the work W. Therefore, a sharp edge is not formed and the duty ratio is small. Next, the routine proceeds to step 106, where it is judged if the duty ratio calculated at step 104 is a predetermined value or more. If the duty ratio is equal to or greater than the predetermined value in step 106, the process proceeds to step 108 and GOOD is displayed on the screen of the CRT display device 25. If the duty ratio is not equal to or greater than the predetermined value in step 106, the process proceeds to step 110 and NG (defective) is displayed on the screen of the CRT display device 25. After displaying the steps 108 and 110, the program is terminated.

Here, it is possible to eliminate the structure of the color camera 15 and the subsequent parts in the apparatus of the above embodiment and simply visually detect the surface of the work W on which the slit light is projected. In this case, slit light in the width direction of the work W can be clearly recognized as a good primer application state. On the other hand, if the primer application state is poor, the slit light becomes diffusely reflected due to the influence of the unevenness of the surface of the base material of the work W. Therefore, when a problem occurs in the primer coating process of the previous process, it can be pointed out immediately.

As described above, by using the method for manufacturing a long molded product of the present invention, the primer application state of the work W can be reliably detected without mixing the dye or the like into the primer. Further, this apparatus is particularly effective for in-line inspection of the coating state of the primer on the extruded work. In this embodiment, the molding is performed by primer coating, but in addition to this, it can be used for coating an adhesive or a lubricant on the surface (coated surface) of a long molded product.

[0012]

Industrial Applicability According to the present invention, slit light is projected obliquely to the surface of a long molded product on which the liquid substance is applied, and the long surface is formed by the difference in the reflectance of the slit light. Since the application state of the liquid substance to the lengthy molded product can be detected, it is not necessary to mix a dye or the like in the liquid substance, and the application state of the liquid substance of the long molded product can be easily and surely detected. This eliminates the need for extra material costs other than the liquid substance when applying the liquid substance. In addition, the liquid substance has an effect that it is not restricted by a mixing condition such as a dye.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an overall configuration of an inspection apparatus using a method for manufacturing a long molded product according to a specific example of the present invention.

FIG. 2 is a flowchart showing a processing procedure of a CPU used in the apparatus of the embodiment.

FIG. 3 is a front view showing a slit plate according to the apparatus of the embodiment.

FIG. 4 is an explanatory diagram showing a display state of the CRT display device according to the device of the embodiment.

[Explanation of symbols]

11-Light source 12-Diffuse reflector 13-Color filter
14-Slit plate 15-Color camera 18-Primer (liquid substance) application surface 20-Image processing device 25-CRT display device W-
Work (long molded product)

Claims (1)

[Claims] 1. A method for producing a long molded article, comprising extruding a long molded article, applying a liquid substance to at least one surface of the long molded article, and detecting the coating state of the liquid substance. Slit light is projected from an oblique direction with respect to a coating surface of a substance, and a coating state of the long molded article is detected by a difference in reflectance of the slit light on the coating surface of the long molded article. And a method for producing a long molded article.