JP2003302905A - Defect checkable transparent printing label and transparent drink bottle fitted therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a defect checkable transparent printing label having a function capable of checking various kinds of defects of the transparent printing label in particular. <P>SOLUTION: The defect checkable transparent printing label is a transparent label having transparent printing layers (2 and 2a) on the surface of a transparent substrate film (1) and is provided with near IR absorption layers (3, 3a and 3b) containing a near IR absorption agent in positions of any among an outside surface (3) of the transparent substrate film opposite to the transparent printing layer or a lower layer (3a) of the transparent printing layer or an upper layer (3b) of the transparent printing layer. The heat shrinkable or non- heat shrinkable cylindrical label of such label is used by being fitted to the transparent drink bottle. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a defect-inspecting transparent print label and a transparent beverage bottle equipped with the label, which enables inspection of defects formed on a transparent print label (which does not have a white opaque image). .

[0002]

2. Description of the Related Art Generally, a transparent beverage container such as a PET bottle has a printed tubular film attached as a label to make a product.
The required image is printed using blue, yellow, etc. ink, and then white ink is used to perform solid printing on the entire surface. Therefore, a printing layer is formed which is in an opaque state and does not transmit light. Although a transparent beverage container mounted with a printed label having such an opaque layer is finally subjected to a defect inspection and shipped, this defect is often mainly related to the mounted label. The drawbacks that occur on the attached label are mainly disturbances in the shape of the perforation holes provided in the label, and tears from the folds formed on the cylindrical label before wearing. Here, the perforations in the shape of the perforations were not accurately formed in the perforation process, or when they were attached to a bottle or the like due to heat shrinkage, the perforations were broken and two pieces were connected. It is like a flat hole. Regarding breakage from the fold, the cylindrical label (original) before wearing is folded in two and rolled, but even if this is opened and contracted / installed, this fold does not disappear and remains. ing. It is a break from this fold.

A known inspection means for the defects of the opaque printed label uses, for example, a white fluorescent lamp as a light source, which is illuminated from behind the labeled PET bottle and is placed on the opposite side. The image is captured by the attached CCD camera, and light leaks from the defect (transmission) by image processing.
There is a method of detecting defect by detecting the defect, or a method of using infrared light as a light source and similarly capturing an image with a CCD camera with a visible light cut filter and performing image processing.

[0004]

By the way, the above-mentioned conventional defect inspection means are not sufficient because of the following problems. One of them is that the accuracy of defect inspection is poor for (substantially) transparent printed labels printed in red, blue, yellow, etc. without providing a white opaque underlayer. The use of this transparent printed label has been particularly increased recently, and the development of a new inspection method is also urgently needed. The second is that the size and shape of the defect have a detection limit, and the third is that it may or may not be possible to determine whether the position of the attached label is correct or not.

The present invention is particularly directed to the transparent printed label, and by finding a new defect detecting means, the conventional problems can be solved and finer defects can be detected with high accuracy. The solution is as follows.

[0006]

That is, the present invention is based on claim 1 as a main invention, which is a transparent substrate film (1).
A transparent label having a transparent printing layer (2 or 2a) on one side thereof, the outer surface (3) of the transparent substrate film opposite to the transparent printing layer (2), and the lower layer (3) of the transparent printing layer (2a).
a) or a near-infrared absorbing layer (3, 3) containing a near-infrared absorbing agent at any position of the upper layer (3b) of the transparent printing layer (2).
It is a defect-inspecting transparent printed label characterized by being provided with a or 3b).

The transparent label having the defect inspection property is a heat-shrinkable or non-heat-shrinkable transparent cylindrical label (4, 5).
Claim 2 is provided as follows.

A third aspect of the present invention provides the transparent cylindrical label (4, 5) as a transparent beverage bottle. Hereinafter, each of the inventions will be described in detail in the following embodiments.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The defect inspecting transparent printed label which constitutes the main invention will be described. First, the name of the defect inspecting transparent print label (hereinafter, simply referred to as defect inspecting label or label) is given mainly because of the defects existing in the label as described above, and this is the label having the ability to be effectively inspected. It is a thing. The label is composed of a transparent substrate film (1) effective as a label, a transparent printing layer (2 or 2a) and a near infrared ray absorbing layer (3, 3a or 3b). The description will be made with reference to this. This is shown in Figure 1 (cross section),
First, the first transparent substrate film will be described.

The transparent substrate film No. 1 may be either heat-shrinkable or non-heat-shrinkable as the shrinking property, but it needs to be transparent. The higher this transparency, the better,
This is because the transparency of the transparent printing layer (2 or 2a) based on red, blue, yellow or the like is further increased, and the higher the transparency, the more the defect inspection performance is improved.
The total light transmittance is preferably 70% or more. Heat resistance of about 60 ° C or higher is also required.

When the film is heat-shrinkable, the resin for the transparent substrate film 1 is preferably a copolyester resin, a cyclic or acyclic olefin resin, a polystyrene resin, or a polyvinyl chloride resin. . The transparent substrate film 1 may be a monolayer film or a multilayer film having two or more layers.

As is generally known, the cyclic olefin-based resin is obtained by polymerization (ring opening / hydrogenation or addition reaction) of norbornene, or a cyclic olefin monomer found in tetracyclododecene or derivatives thereof. A single polymer, a copolymer of a cyclic olefin monomer and an α-olefin such as ethylene or propylene, or a resin obtained by blending this copolymer with a linear polyolefin resin. Above all, more preferred is the blend resin. The linear polyolefin resin selected from the blend resin is more preferably linear low-density polyethylene and / or linear ultra-low density polyethylene, and the blend ratio thereof is 100% by weight of the cyclic olefin resin (single or copolymer). 10 to 100 parts by weight is preferable with respect to parts. The acyclic olefin resin is usually called simply olefin resin, and preferable resins include propylene-ethylene random copolymer and propylene-ethylene-1-butene random copolymer. When the transparent base film 1 is non-heat-shrinkable, preferred resins include polyethylene terephthalate resin, polypropylene resin, and syndiotactic polystyrene resin. It should be noted that the term "...- based resin" is used here because it may be a resin alone or may be a resin which is copolymerized or blended with another resin.

The heat-shrinkability and non-heat-shrinkability of the transparent substrate film 1 depend on the use form of the finally obtained defect-inspecting label for an article to be packaged (container, etc.). Is performed by stretching the film in a longitudinal and / or transverse direction at a necessary ratio by a stretching operation. Regarding the stretching in the longitudinal and transverse directions, when the label has a tubular shape, it is general that the label is stretched in the lateral direction (circumferential direction) more than in the longitudinal direction. The draw ratio is about 2 to 10 times in the transverse direction, preferably 3 to 7 times, and 1 to 2 times in the longitudinal direction. On the other hand, in the case of non-shrinkability, generally, a biaxial stretching operation is performed, and after this stretching, heat setting (at least a temperature higher than the temperature at which the container is mounted) imparts this.

The thickness of the transparent substrate film 1 needs to be determined in consideration of the strength of the support and appropriate flexibility in addition to the type of resin used, but in most cases it is about 20-.
It can be 100 μm.

The transparent substrate film 1 is formed by using a T-die melt extruder which is generally used, but the stretching (this stretching may be performed separately) may be performed continuously with the melt extrusion. In some cases, it may be done separately. The stretching means at that time is either a tenter stretching generally performed or a combination of roll stretching and tenter stretching. Needless to say, it is permissible to add a small amount of various additives (for example, weathering agents, antioxidants, antistatic agents, etc.) to the film.

Next, the near infrared absorbing layer (3, 3a, 3b) will be described. First, there are three cases where the layer is provided. One of them is (1A) in FIG. That is, the transparent printing layer (2) provided on one side of the transparent substrate film 1.
The position of the outer surface 3 of the film opposite to that, the position 2 of which is indicated by (1B) (3a), that is, the lower layer of the transparent printing layer (2a), and the position 3 of which is indicated by (1C) (3b), that is, transparent It is an upper layer of the printing layer (2). Basically, it may be provided at any one of these positions, but it is not avoided to be provided at any two or more positions. Among these one position, the case (1A) is preferable. This is because the direct contact with the transparent print layer may not give a good result to the print image quality.

The near infrared absorbing layers 3, 3a and 3b are
It is formed by coating a resin solution prepared by mixing and dispersing a predetermined amount of a near-infrared absorbing agent. In this case, a resin (matrix) that disperses the absorbent is first selected, which includes adhesion to the transparent substrate film 1, mixing and dispersibility with the near infrared absorbent, transparency, and heat resistance (60%). It is necessary to take into consideration the coating property and the like). As the resin satisfying such conditions, for example, an ultraviolet curable acrylic resin (a liquid oligomer or prepolymer is used as a raw material) or methyl ethyl ketone, dioxolane, dimethylformaldehyde, tetrahydrofuran, toluene, xylene, methyl cellosolve is used. , Thermoplastic resins such as acrylic resins, urethane resins or acryl-urethane resins, and thermoplastic copolyester resins which are dissolved in chloroform or the like alone or in an appropriate mixed solvent thereof.

As the near-infrared absorbing agent, about 800 to 11
A near-infrared dye having a maximum peak wavelength of 00 nm, which includes organic dyes, metal oxides, and organometallic complexes.
However, in the present invention, the organic dye is desirable in consideration of the compatibility with the resin and the solubility in the organic solvent.
For example, when classifying them from the structure, anthraquinone series, phthalocyanine series, naphthoquinone series, (naphthalo)
Examples include cyanine type, polymer condensed azo type, and pyrrole type. Which of these is selected is selected in view of matching with the wavelength of the infrared light source used for the defect inspection. Therefore, in order to achieve complete absorption, it may be preferable to use one kind or it may be better to mix two or more kinds.

The amount of the near infrared absorber added to the resin is
It is necessary to decide the balance with the transparency as well as the infrared absorption effect. In terms of transparency, since the absorbent itself is colored, if it increases, the transparency of the whole will be affected and also the quality of the printed image will be affected. The balance between these two is about 1 to 1
It is 0% by weight (based on solid content), preferably 3 to 7% by weight.

The layer thickness of the near-infrared absorbing layers 3, 3a, 3b must be determined in consideration of the balance between the infrared absorbing effect and the transparency, but within the range of the amount of the near-infrared absorbing agent added. The balance is 1 to 10 μm, preferably 2 to 8 μm (when the amount of the near infrared absorber is large, the balance is set in a thin direction).

The near infrared absorption layers 3, 3a and 3b are formed by
First, a predetermined amount of the resin and the near-infrared absorbing agent is uniformly dissolved and mixed with a common solvent for both, and then adjusted to an appropriate solution viscosity according to the coating means. Then, the transparent substrate film 1 is coated on the entire surface at any one of the above positions by a gravure printing method, a bar coater method, or a screen printing method in some cases, and dried (hot air or ultraviolet rays) to be formed. In order to improve the adhesion to the film 1, if necessary, pretreatment may be carried out by means generally known as pretreatment such as corona discharge.

Next, the formation of the transparent print layers 2, 2a will be described. First of all, the transparency of the printed layer means that at least near-infrared light is absorbed by the near-infrared absorption layer 3, 3a or 3
It is necessary that the light is absorbed by b and becomes substantially a black shadow, and that this black shadow light can pass through the printing layer and be caught by the CCD camera. The influence of the printing layer on the transparency is when two to three colors of red, blue and yellow are layered rather than a single color. For example, the total light transmittance in the case where each color is solidly overprinted with 175 lines. Is about 3%. Even with such a low transmittance, the transmission of near-infrared light will not be blocked. This is because the near-infrared light is absorbed by the near-infrared absorption layer and becomes a black shadow, which is transmitted through the three-color solid overprint portion,
As it is, it becomes a black shadow and can be detected and imaged by the CCD camera together with the above defects. In other words, even if three-color overprinting is performed on the print image, it does not affect the defect inspectability, so any print design may be used (of course, the same for one and two colors). From the results of the three-color overprinting, it can be said that the minimum transmittance of the printing layer is 3% in total light transmittance, but it is not limited to this. In addition, 1 with black ink
The total light transmittance in the case of a 75-line solid printing single layer is a little over 8%, but this black printing layer has some influence on the imaging accuracy by the CCD camera, but it cannot be said that the defect detection cannot be performed.

The transparent printing layer may be printed by a screen printing method or the like, but is usually a gravure printing method.
As the printing ink, a commonly used water-based or oil-based acrylic or urethane resin ink is used.

The layer thickness of the transparent printing layer 2 or 2a is 0.5 to
The thickness is 10 μm, preferably 1 to 5 μm. With this layer thickness, not only the print quality but also the transparency can be secured. When two or three colors are layered, it is desirable to set each color so that it falls within this thickness range.

The transparent label having the above-mentioned structure is a transparent label having an excellent defect inspection performance capable of detecting even minute defects which could not be detected by the conventional method. It is preferred, but preferred) to be used with the heat-shrinkable or non-heat-shrinkable transparent tubular labels (4,5) provided in claim 2. The tubular label generally refers to a rigid or semi-rigid transparent container including a body (circular shape, polygonal shape), a bottom and a mouth. The transparency of the object to be packaged may be about 10% or more in total light transmittance, and thus may be (transparent) colored.
The object to be packaged is generally a hard or semi-rigid beverage bottle such as a glass bottle or a PET bottle, which is 70% without coloring.
There is more than a degree. The tubular label is attached to the bottle ten times. Even if the bottle is filled with the colored beverage, there is no problem as long as it has the transmittance of about 10% or more.

Here, the heat-shrinkable transparent cylindrical label (4) or the non-heat-shrinkable transparent cylindrical label (5) is generally used as follows in the case of the beverage bottle as an example. There is. That is, in the transparent tubular label (4), when there is unevenness on the trunk, or when the wearer wears it from the torso or bottom to the shoulder to the mouth, to the neck, and the transparent tubular label (5), This is the case when it is worn only on the torso. Of course, the heat-shrinkable tubular label is used in any case.
Therefore, the heat-shrinkable tubular label is more preferable because it has a wider application range. After the bottle has been used, in order to separate and collect the main body and the attached label, perforations are generally formed in a vertical shape on the label.

A heat-shrinkable transparent label before being attached to a transparent beverage bottle is illustrated in the front view of FIG. 2 (2A). In other words, it is in the state of a label that has been formed into a tubular shape in advance before being attached. Here, 4a is a contact portion where both ends are polymerized and adhered. On the other hand, the non-heat-shrinkable transparent label before being attached to the transparent beverage bottle is illustrated in FIG. This is like the heat shrinkable transparent tubular label,
It is in a flat state because it is not molded into a tubular shape in advance but is worn while rolling on the bottle. This rebounding and wearing are performed by the heat-sensitive adhesive layer 5a provided on both inner end surfaces. Hereinafter, this 5 is referred to as a developed non-heat-shrinkable transparent cylindrical label. 4b and 5b are perforations, which are torn from here to separate them from the main body.

The heat-shrinkable transparent cylindrical label 4 or the expanded non-heat-shrinkable transparent cylindrical label 5 is attached to the transparent beverage bottle as follows. First, in the case of the heat shrinkability 4, the web-like label on which the near-infrared absorbing layer and the transparent printing layer are formed is continuously supplied to the center seal zone, where both ends are removed by a solvent or heat. It is polymerized and adhered to form a tubular shape, which is once folded into a flat shape and taken up by a roll. Therefore, it is unavoidable that a crease is formed on both sides due to being wound up on a roll, and the crease remains even after the bottle is put on the back. In particular, many tear defects other than perforations are caused by this fold. The tubular label wound on a roll is cut transversely to a predetermined size, opened in a tubular shape, inserted into a supplied transparent bottle, and finally sent to a hot air (steam) zone for heat shrinkage. While being fitted and fixed. On the other hand, the non-heat shrinkage 5 is generally performed discontinuously or continuously. The difference between the two is particularly when the heat-sensitive adhesive layer 5a is formed. That is, in the case of discontinuity, the heat-sensitive adhesive layer 5a is formed in advance, and this is temporarily wound into a roll shape. After that, when necessary, she unwinds and wears a tight fit. Therefore, by rolling with a roll, the adhesive layer is generally provided with a blocking means. If this is continuous, first form the heat-sensitive adhesive layer 5a, then cut transversely to a predetermined size, affix one end of the heat-sensitive adhesive layer 5a to the barrel of the bottle waiting for this, Next, the bottle is rotated while rotating to polymerize the other end of the heat-sensitive adhesive layer 5a. The adhesion fixing at one end and the polymerization at the other end are preliminarily heated to develop the tackiness. It is said that this series of steps is continuously performed. Regarding the above-mentioned drawbacks, the non-heat-shrinkable transparent tubular printed label has no fold line as in the case of the heat-shrinkable transparent tubular printed label, and therefore, no tearing defect occurs due to this.

The inspection means for the label having the above-mentioned defects is performed as follows, for example. A transparent beverage bottle equipped with the transparent cylindrical label 4 or the expanded non-heat-shrinkable transparent cylindrical label 5 is placed at the center, and a near infrared LED (light source) and a CCD camera are arranged in front of and behind the transparent beverage bottle to keep the transmitted light. This is performed by a method called image pickup and image processing. When there is no defect, the transmitted light appears as a black shadow, and when there is a defect, that part appears bright, so that the image can be discriminated.

A method using a resin containing a fluorescent dye is known in order to detect the unevenness of the resin coating.
The present inventors changed this to the near-infrared absorbing layer of the present invention to form a fluorescent absorbing layer, and tested it in the same manner as above. The result is that the inspection itself must first be performed constantly in a dark room, workability is poor and not productive, detectable defects are not clearly imaged, and there is a limit to the size of the projected image, etc. However, when the beverage bottle is displayed in a store, it is confirmed that the fluorescent color is emitted, so that it does not give a pleasant feeling, and the above problems cannot be solved.

[0031]

EXAMPLES The present invention will be described in more detail with reference to the following examples.

Example 1 First, the following materials were prepared. Transparent substrate film 1 (hereinafter referred to as substrate film) A polyester heat-shrinkable film (thickness: 50 μm) made of a mixture of Eastman Chemical Co., Ltd., PETG 50 wt% and Kanebo Synthetic Fiber Co., Ltd., FGS10 50 wt%. Roll-rolled film cut to a width of 300 mm. The total light transmittance of the film is about 88%, and the heat shrinkability is, for example, 80 ° C. warm water / 10 sec.
%, Vertical 3%. 90% warm water / 10% for 51% in width and 5% in length
It has the characteristics of. ● Coating liquid for near-infrared absorption layer 3, oily acrylic transparent resin liquid (Toyo Ink Mfg. Co., Ltd., oily gravure printing ink, LP super, solid content 30% by weight, toluene and ethyl acetate 3% by weight of (soluble) phthalocyanine-based near infrared absorber (manufactured by Nippon Shokubai Kagaku Kogyo Co., Ltd., TX-
EX-906B, maximum absorption wavelength 922 (toluene)) added and uniformly dissolved. Hereinafter referred to as near infrared coating liquid. ● A printing ink for the transparent printing layer 2, a water-based acrylic gravure ink of red, blue, and yellow (Aqua Ecology series manufactured by Toyo Ink Mfg. Co., Ltd.) is used, and each color ink is a mixed solvent of water and IPA. Dilute (volume 1: 1),
Adjusted to an appropriate gravure ink density (about 2 Pa · s).

Next, the near-infrared coating solution was coated on the entire surface of the base film by gravure printing, and subsequently dried by heating (hot air drying tunnel at 50 to 55 ° C.). The desired near-infrared absorption layer 3 is formed with sufficient adhesion,
The layer thickness was 2.2 μm. Hereinafter, it is referred to as a near-infrared absorbing base film.

Next, gravure printing (175 line gravure plate) was performed on the opposite surface of the near-infrared absorbing base film with the yellow, blue and red printing inks. The printing here is a solid image for each color in the order of yellow, blue, and red.
After printing each color, drying at 45 ° C. was performed to overlap the three colors.
Each color is laminated with sufficient adhesion, the total thickness of this printing layer is 4.0 μm, and the total light transmittance of the whole is 3.5.
%Met.

Further, the following test was conducted in order to confirm the near-infrared absorbing ability of the printing film. The printing film 1
A portion is cut (100 × 100 mm) and hung vertically, and a planar near-infrared LED light source (AL-402 / 2.
2 mW · peak wavelength 910 nm arranged in a plane at intervals of 5 mm in length and width), and a CCD camera connected to a monitor was arranged on the opposite side of the printing layer 2. Next, all the operating states were set, the light source was first turned on, the transmitted light was imaged by the CCD camera placed on the opposite side, and it was displayed on a monitor for observation. As a result, no transmitted light was seen in any of them, and a black image having a size of 100 × 100 mm was clearly observed. This result shows that it has the capability of surely inspecting the presence or absence of the above-mentioned defects.

Next, both ends of the printing film are first separated by 40
The film was trimmed in units of mm to have a width of 220 mm, and was adhesively sealed with an organic solvent under the following conditions to form a tubular film. Bending both ends of the 220 mm wide printing film (printing surface is inside) that is continuously supplied so that both ends are in the center, while simultaneously overlapping both ends with 4 mm width, 1, 3 -Dioxolane and n-hexane were mixed in a ratio of 10 to 1 (volume), and while coating this,
It was passed through a heating (70 ° C.) nipping roller and thermocompression bonded to form a tubular film. The formed tubular film was folded on both sides to be flat and wound on a roll. Incidentally, the sealing means here is performed by the organic solvent sealing method, but the sealing can also be performed by another ultrasonic method or the like. Which one is selected is determined in consideration of the type of the transparent substrate film 1, workability and the like.

Next, while the continuous tubular film wound on the roll is opened, perforations are continuously drilled vertically at a position 10 mm away from the seal portion with a hole diameter of 0.7 mm and a pitch of 2 mm. Then, the film was continuously cut in units of 100 mm in length and processed into a tubular film for mounting on a bottle. Then, one piece of this tubular film is taken out, and a perforation portion and a fold portion are provided with defects in advance, and this printed portion is placed inside (body angle) circular PET bottle (diameter 65 mm, body length 85).
mm) and heat shrink (85 ℃ in steam tunnel)
The two-step heating for 5 seconds at 95 ° C. for 7 seconds) was performed. This wearing state is shown in FIG. 3 (front view). 6 in the figure
Is a (body angle) circular PET bottle body, 7 is a transparent cylindrical print label that is shrink-fitted and fixed, 7a is a flat hole formed by connecting two adjacent perforations (hereinafter referred to as defect 1), 7
Reference character b indicates a breakage defect (hereinafter referred to as defect 2) which is created by breaking the fold line in advance. Hereinafter, this bottle is referred to as a defect bottle.
As a comparative sample, a cylindrical film which does not have the above-mentioned defects was similarly obtained by shrink-fitting and fixing to a (body angle) circular PET bottle. Hereinafter this bottle is referred to as a comparative bottle.

Then, the comparative bottle and the defect bottle were filled with drinking water, and the following defect inspection was conducted. Also in the defect inspection here, the planar near-infrared LED light source used above and C
It was projected on a monitor using a CD camera and visually checked. That is, the comparative bottle and the defect bottle were set up side by side and the above-mentioned planar near-infrared LED light source was vertically installed at a distance of 3 cm (the defect bottle faces the defect surface). On the opposite side, one CCD camera was placed 25 cm apart on each side and connected to a monitor. Next, the light source was turned on, the transmitted light was imaged by a CCD camera, and the image was projected on a monitor for observation. The results are shown in FIG. In the figure (4
A) is an image of a comparative bottle, and (4B) is an image of a defect bottle. In the comparative bottle, normal perforations can be visually recognized in the dim shadow (near infrared absorption layer) with clear brightness, and in the defective bottle, defects 1 and 2 are further displayed in the image of the comparative bottle. The corresponding flaws are shown in brightness. Since the result can immediately confirm the presence or absence of a defect, it is possible to automatically inspect the defect.
In the figure, the image 8 is a double-sided overlapped portion, which appears darker than the dim shaded portion, and the white cap (unnumbered) appears completely black. The fact that the image with 8 and the cap can be clearly seen also indicates that it can be used for the inspection of the mounting position of the label.

[0039]

Since the present invention is constructed as described above, it has the following effects.

With regard to transparent printed labels, which have been difficult to detect by the conventional defect inspection method, it becomes possible to inspect finer defects, which leads to further improvement in quality.

Further, it becomes possible to inspect whether the label is attached or not.

[Brief description of drawings]

"

FIG. 1 is a cross-sectional view showing an example of the structure of a defect inspection label.

FIG. 2 shows a transparent printed cylindrical label front view and a developed transparent printed non-cylindrical label plan view.

FIG. 3 is a front view of a plastic bottle with a transparent printing tubular label attached thereto.

FIG. 4 is a monitor image obtained by imaging Example 1.

[Explanation of symbols]

1 ... ・ ・ ・ Transparent substrate film 2, 2a: Transparent printing layer 3, 3a, 3b ... Near infrared ray absorption layer 4 ・ ・ ・ ・ ・ ・ Heat-shrinkable tubular label 5 ... Expandable non-heat-shrinkable tubular label 6 ... Round PET bottle 7 ・ ・ ・ ・ ・ ・ Wearing transparent printing tubular label

Claims (3)

[Claims] 1. A transparent label having a transparent printing layer (2 or 2a) on one surface of a transparent substrate film (1), the outer surface (3) of the transparent substrate film opposite to the transparent printing layer (2),
Near-infrared absorbing layer (3, 3a, or 3b) containing a near-infrared absorbing agent at any position of the lower layer (3a) of the transparent printing layer (2a) or the upper layer (3b) of the transparent printing layer (2). A defect-inspecting transparent printed label, characterized by being provided with. 2. The defect-inspecting transparent printed label according to claim 1, wherein the defect-inspecting transparent label is a heat-shrinkable or non-heat-shrinkable cylindrical label (4, 5). 3. A transparent beverage bottle in which the cylindrical labels (4, 5) are attached to the transparent beverage bottle (6) with perforations.