JPH0457220B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a method for displaying the positions of defects such as flaws, bubbles, streaks, etc. that occur in strip-shaped objects such as photographic film and photographic paper. Furthermore, the present invention relates to a method of displaying such a defect position at an edge portion along the longitudinal direction of a strip.

(B) Prior art and its problems For example, when producing photosensitive materials such as photographic film or photographic paper, a strip base is coated with a photosensitive agent and/or
Or, the final product is obtained through a process of applying and drying various coating liquids that play a supporting role, and a process of slitting and cutting the strip after this process to make it easier for the user to use. However, defects in the strips that occur during the coating and drying process must be removed before packaging.

In order to remove such defects in strips before packaging, it is necessary to clearly identify the defect location.
The first method is to indicate the distance from a reference position such as the starting end of the strip, and the second method is to display a mark indicating the defect position on the strip itself. The first method is that the starting end of the strip may be partially missing before the defect is removed, or/furthermore, due to an error in the measuring device that measures the length from the reference position, it may deviate from the defect position during removal, resulting in an error. The second method is often used mainly due to the disadvantage of causing removal. In the second method, the defect position is displayed directly on the defective part, such as by making a hole in the defective part by punching, or by spraying ink onto the defective part in spots. In order to indicate the longitudinal position of the defect, there are known methods such as pasting a label with adhesive to the end of the edge along the length of the strip closest to the defect, and also applying ink to the end of the edge. . The present invention relates to the latter.

There are different ways to remove defects on strips that occur during the coating and drying process before packaging, depending on whether the defect is continuous in the longitudinal direction of the strip like a streak or if it is a point-like defect. It is naturally different. In other words, in the case of a point defect, only the point defect portion or the entire width including the point defect portion is removed, whereas in the case of a streak defect, the defect is removed in the width direction in order to increase the product yield as much as possible. It is removed continuously in the longitudinal direction in limited areas. In order to remove point defects and streak defects separately in this way, it is necessary to display the defect positions so that they can be distinguished from each other. However, as shown, it is impossible to distinguish between them. There are methods to make this possible, such as changing the shape or color of the adhesive label with point defects and streak defects, and changing the color of the ink. If the defects are mixed together, the display of defect positions may be confused, and if the removal work must be carried out in a dark room, such as with photosensitive materials, it may be difficult to distinguish them.

(C) Purpose of the Invention The purpose of the present invention is to obtain a method for classifying defects in a strip into two types and displaying defect positions so that each defect can be efficiently removed.

More specifically, it is an object of the present invention to obtain a method of displaying defect positions that can efficiently remove defects in a strip by dividing defects into streak defects and dot defects.

Here, a streak defect refers to a defect whose length in the longitudinal direction is larger than the length in the width direction of the defect, and a dot defect generally refers to the opposite defect. It varies depending on the size or shape of the product.

(D) Structure of the Invention As a result of various studies, the present inventors found that when displaying the defect position at the edge of a strip, the position of the first type of defect (streaky defect) is displayed at one edge. section,
It has been found that the above object can be achieved by displaying the position of the second type of defect (point-like defect) at the other ear end.

Needless to mention, methods for indicating the defective position of a strip-shaped article include a method of pasting a label with adhesive on the edge portion along the longitudinal direction and a method of applying ink. However, in the previously known literature, there is a method of the present invention, that is, a method of displaying the defect position of a strip at the end of an edge along the longitudinal direction of the strip. There is no description regarding a method for displaying a defect position of a strip-shaped object, which is characterized by displaying the position of a defect on one end of a belt-like object and displaying a point-shaped defect position on the other end of the band.

(E) Examples Next, examples will be described to explain the present invention in more detail, but the present invention is not limited thereto, and various applications can be made within the scope of the claims.

FIG. 4 shows an example of displaying defect positions using a known method that is not based on the present invention.

In FIG. 4A, labels 2 are affixed to two edges of the defect, at the beginning and end, to indicate the position of the streaky defect 3.

In FIG. 4B, a label 2 is attached to the edge of the defect to indicate the position of the point defect 4.

Although the types of defects in A and B are completely different, the label attachment status is the same, and the type of defect cannot be determined from the label attachment status.

FIG. 1 shows an example of displaying defect positions according to the present invention.

In Fig. 1, the starting position and ending position of the streaky defect 3 are at one edge of the strip (the upper part in the figure).
In addition, since the position of the dot-like defect 4 is displayed by pasting a label on the other end of the strip (at the bottom in the figure), there is no mistaking the stripe-like defect from the dot-like defect. Second
The figure shows a method for detecting defects in photosensitive materials and a method for displaying defect positions according to the present invention.

In FIG. 2, a defect detector 5 detects defects on the surface of the photosensitive material 1 traveling in the longitudinal direction. As the defect detector 5, a flying spot type detector using a laser beam is effective.

The signal from the detected defect is determined by the defect determination device 6 as to whether it is a defect or a streak defect, and also determines whether to remove it in the next process.If removal is necessary, a label is attached. The command is transmitted to the delay device 7. After the defect passes the defect detector, the delay device 7 causes the labeling devices 8A and 8 to
This is a device for delaying the labeling command signal to the labeling devices 8A and 8B for the time necessary to travel until reaching point B. The label pasting device 8A is a device for pasting a label 2 with adhesive indicating the start and end positions of streak-like defects to one end of the photosensitive material. The label pasting device 8B is a device for pasting the adhesive label 2 indicating the position of a dot-shaped defect onto the other end of the photosensitive material. The printing device 9 is a device for printing on the recording paper 10 the approximate length from the starting edge of the photosensitive material and the accurate position in the width direction of the detected defect.

FIG. 3 shows the basic configuration of a slitting device including the process of removing defective parts of the photosensitive material.

In FIG. 3, before a photosensitive material 1 containing a defect is cut by a slitting device 12, a label indicating a position of a streak defect and a label 2 indicating a position of a dot defect are detected by a label detector 14, and the traveling of the photosensitive material is controlled. The detection signal is transmitted to the drive control device 13. The drive control device 13 stops the photosensitive material travel drive motor 11 and notifies the operator with a buzzer or the like. The operator determines whether the reason for the stoppage is due to a streaky defect or a dotted defect, and with reference to the recording paper 10 in FIG.
6 and the defective portion is discharged into a reject container 17.

(F) Effects of the Invention As is clear from the above explanation, according to the present invention, defects on a strip are clearly displayed as streak defects and dot defects, so the task of distinguishing and removing defective locations is possible. can be done efficiently and without error.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a strip-like object for explaining a method of displaying a defect position according to the method of the present invention. FIG. 2 is a schematic diagram showing a method for detecting defects in photosensitive materials and a method for displaying defect positions according to the present invention. FIG. 3 is a schematic diagram showing the basic configuration of a slitting device including a step of removing defective portions of a photosensitive material. FIG. 4 is a diagram showing an example of a band-shaped object for explaining a method of displaying a defect position using a known method that is not based on the present invention. 1...Band-shaped object or photosensitive material, 2...Label with adhesive, 3...Striation defect, 4...Point defect, 5...
... Defect detector, 6 ... Defect determination device, 7 ... Signal delay device, 8 ... Label pasting machine, 9 ... Printing device, 10 ... Defect recording paper, 11 ... Travel drive motor, 12 ... Slitting Device, 13...
Traveling drive motor control device, 14... Defect position display label detector, 15... Cutting device, 1
6...Product, 17...Reject container.

Claims (1)

[Claims] 1. In a method of displaying the defect position of a strip at an edge along the longitudinal direction of the strip, defects are classified into two types, and the position of the first type of defect is displayed at one edge. . A method for displaying a defect position of a band-shaped object for removing a defective portion, characterized in that the position of a second type of defect is displayed at the other edge.