JPH0718931B2 - How to detect the presence of transparent film - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a simple method for detecting whether or not a transparent film is present in a predetermined portion.

<Prior Art> In order to detect whether or not there is a film in a predetermined portion, it is sufficient to use a photoelectric switch or the like as long as the film is opaque, but when the film is transparent, Sensual methods such as visual and tactile were the mainstream. However, handling a large amount by such a method was a difficult problem.

In recent years, heat-shrinkable cap seals and labels made of transparent film are often used in the mouth and body of containers,
Such a cap seal is an effective means of ensuring that the product has not been opened. However, since such a cap seal or the like is continuously inserted and covered at the mouth of the container by an automatic machine, there are cases in which a coating error occurs. It is a problem in that the uncovered product goes out as it is because of unopened failure, and it is necessary to strictly check it.

<Means for Solving Problems> The present invention provides a simple method for detecting whether or not a cap seal or the like as described above is inserted and covered in a predetermined portion of the container mouth, that is, the presence or absence of a transparent film in the predetermined portion. One of the purposes is to provide such a method.

Furthermore, the present invention can detect whether or not a transparent film is arranged on a predetermined portion of an appropriate material surface, and this point is made for another purpose.

That is, the feature is that in a method of detecting the presence or absence of a transparent film coated with another material, an electromagnetic wave from an energy source including infrared rays is radiated to a predetermined location,
The point is to detect the presence or absence of the transparent film at the predetermined location by measuring the reflection intensity of far infrared rays having a wavelength of μm to 20 μm.

Next, the means for solving the problems will be described in more detail.

Examples of the energy source containing infrared rays according to the present invention include infrared lamps and incandescent bulbs, and there is no particular limitation. In order to measure the reflection intensity of far infrared rays in the electromagnetic wave from such an energy source, a thermoelectromotive force type element in the infrared region, for example, a detector such as a thermopile or a pyroelectric element can be exemplified and there is no particular limitation.

At this time, the reflected electromagnetic wave needs to be cut out from something other than far infrared rays to be measured, and it is necessary to take out a preferable wavelength that can be measured by the detector by using a material such as a filter. It is necessary to select a wavelength that matches the light absorption band of the transparent film.

For example, when the above-mentioned thermopile or pyroelectric element is used as a detector, it is preferable to measure the reflection intensity in this range by extracting a wavelength in an appropriate range from infrared rays of about 7 to 20 μm with the filter or the like. desirable. Of course, depending on the accuracy of the detector, infrared rays having a wavelength other than the above value can be detected, but the far infrared rays are suitable for detecting the presence or absence of a transparent film.

For example, when the transparent film is made of vinyl chloride, the absorption band of light in the infrared region of vinyl chloride has a wavelength
There are several such as 3.4 μm or around 5.8 μm and 7 μm to 12 μm. Among them, 7 μm to 12 μm
The part m is wide and stable. Therefore, the wavelength is 7 μm
It is suitable to utilize far infrared radiation, including being ~ 12 μm.

Far-infrared is the infrared ray technology "Heating and its application", edited by the Federation of Infrared Technology Committee, page 3, (Showa 36
According to October 20, 2010, published by Denki Shoin Co., Ltd., the wavelength is generally 4 μm or longer, and the wavelength of 4 μm or shorter is said to be near infrared.

In order to represent the reflection intensity in the present invention, reflectance or transmittance may be used as a factor, but other factors may be used and are not particularly limited.

The above-mentioned filter may be used before radiating electromagnetic waves to a predetermined place, or may be used thereafter, and is not particularly limited, but when used before radiating to a predetermined place, the above-mentioned filter among electromagnetic waves is used. The transmitted wavelength is radiated to a predetermined place.

The transparent film is a generic term for films, sheets, plates and the like having appropriate transparency such as vinyl chloride, polypropylene, polyethylene and polyethylene terephthalate.
If it is transparent even if it is colored, a colorless and transparent one is generally used. Such a transparent film may or may not be heat-shrinkable, but is preferably heat-shrinkable when it is used for the cap seal, label or the like.

There are many cases where such a transparent film is used together with other materials, and therefore, the present invention detects whether or not the transparent film is provided in a predetermined portion of such other material, and the other material is used here. Examples of such materials include glass bottles, containers such as plastic bottles, pipes, other materials having a cylindrical outer shape, paper, film, and other plate-shaped materials,
There is no particular limitation.

For example, when using a transparent film with a container, it is common to apply the above-mentioned cap seal, label, etc. to the mouth or body of the container, and when used with a plate-shaped material, it is transparent to the plate-shaped material. It is conceivable to adapt in such a way as to laminate the film.

Thus, in order to detect whether or not the transparent film used together with other materials is present in a predetermined portion, it is sufficient to detect the reflection intensity of far infrared rays having a wavelength of 7 μm to 20 μm in an electromagnetic wave from an energy source including infrared rays. At this time, it is preferable to measure the reflection intensity in the case where the preliminarily transparent film is present on the other material and the case where it is not present, and to set a specific reference value based on this value.

And, in the case of the reflection intensity below the reference value or the reflection intensity above the reference value, the presence or absence of the transparent film can be determined by comparing and determining the presence or absence of the transparent film, respectively. Can be detected extremely easily.

Of course, this reference value may be arbitrarily set depending on the types and properties of the transparent film and other materials, and there is no particular limitation. It is not necessary to set it if comparison is possible without setting such a reference value.

By doing so, it is possible to easily detect whether or not the transparent film is present at a predetermined location only by radiating an electromagnetic wave from an energy source including infrared rays to the predetermined location.

In this case, it does not matter where the predetermined location is,
The place where the presence or absence of a transparent film is most easily detected is desirable.

The above is exemplary description of the preferred embodiment of the present invention.
Needless to say, the present invention is not limited to this aspect.

<Example 1> It was investigated by the following method whether or not the mouth of the glass bottle was covered with a cap seal made of a tubular body of a transparent heat-shrinkable film having a thickness of 40 to 50 µ.

That is, a filter that radiates an electromagnetic wave using a 100 V, 100 W incandescent bulb as an energy source at a central portion of the position where the cap seal is legally covered, and transmits a wavelength of 7 to 20 μ at a position where the electromagnetic wave is reflected. And a thermopile for detecting the reflection intensity of far infrared rays transmitted through the filter were used to measure the reflection intensity, in this example the reflectance.

At this time, if there is a transparent film, the reflectance is 20%, if not, it is 100%, and the line with this average value of 60% is set as the reference value, and by comparing the measured data and the reference value with a computer, The presence or absence of a transparent film at the mouth of the glass bottle was detected.

According to this example, the presence or absence of a cap seal at the mouth of a glass bottle can be detected very easily even during continuous production operation by an automatic machine, and if cap seal coating is not applied or if a coating error occurs, immediate response is possible. It has become possible.

<Example 2> When a transparent plastic film was continuously thermocompression-laminated on a printed art paper, the same electromagnetic wave as in Example 1 was radiated to both sides of the running art paper, and the transparent plastic film was formed by the same method. The presence or absence of is detected.

As a result, it is possible to immediately detect a defective laminated portion, which is extremely convenient.

<Effects of the Invention> As described above, according to the present invention, it is possible to detect whether or not a transparent film is present in a predetermined portion by an extremely simple method, and is expected to be applied to various industrial fields in the future. Is.

Claims (1)

[Claims] 1. A method for detecting the presence or absence of a transparent film coated with another material, wherein an electromagnetic wave from an energy source including infrared rays is radiated to a predetermined location to measure the reflection intensity of far infrared rays having a wavelength of 7 μm to 20 μm. The method for detecting the presence or absence of the transparent film at the predetermined location by performing the above.