JP4117452B2 - Defect inspection transparent printing label and transparent beverage bottle wearing it - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention particularly relates to a defect-inspecting transparent printed label that enables inspection of defects formed on a transparent printed label (without a white opaque image) and a transparent beverage bottle equipped with the label.
[0002]
[Prior art]
Generally, a transparent beverage container such as a plastic bottle is a product with a printed cylindrical film attached as a label, but in many cases, this printing uses inks such as red, blue, yellow, etc. The necessary images are printed, and the entire surface is printed with white ink on it. Accordingly, a printing layer that is opaque and does not transmit light is formed.
The transparent beverage container mounted with the printed label having such an opaque layer is finally shipped after being subjected to defect inspection, but this defect is often mainly related to the mounted label.
The disadvantages that occur on the mounting label are mainly the perturbation of the shape of the perforated holes provided in the label or the tear from the fold formed in the cylindrical label before wearing. Here, the perforation of the perforation shape was not accurately drilled in the perforation drilling process, or two of the perforation holes were broken when the bottle was installed by heat shrinkage. It becomes something like a flat hole.
As for tearing from the crease, the cylindrical label (raw material) before wearing is folded in two and rolled into a roll, but this crease remains undisturbed even if it is opened and contracted / attached. ing. It is a tear from this crease.
[0003]
A known inspection means for the disadvantages of the opaque printed label is, for example, a white fluorescent lamp as a light source, which is illuminated from behind the labeled PET bottle and placed on the opposite side with a CCD with a polarizing filter. Images are captured with a camera, and image processing is used to detect light leakage (transmission) from defects and determine whether it is good or bad. Infrared light is used as the light source and images are similarly captured with a CCD camera with a visible light cut filter. There are methods for processing to detect defects.
[0004]
[Problems to be solved by the invention]
By the way, the conventional defect inspection means has the following problems and is not sufficient.
One is that the accuracy of defect inspection is poor for (substantially) transparent printed labels printed in red, blue, yellow, etc. without a white opaque underlayer. The use of transparent printing labels has been particularly increasing recently, and the development of new inspection methods is urgently needed.
Second, there are detection limits on the size and shape of defects,
Third, there are cases where it is possible to determine whether the attached label position is correct or not.
[0005]
In particular, the present invention relates to the transparent printed label, and by finding a new defect detection means, the conventional problems can be solved and fine defects can be detected with higher accuracy. The solution is as follows.
[0006]
[Means for Solving the Problems]
That is, the present invention is based on claim 1 first, which is a transparent label having a transparent printing layer (2 or 2a) on one side of the transparent substrate film (1), and the transparent printing layer (2) and Near-infrared ray containing a near-infrared absorber at any position on the outer surface (3) of the opposite transparent substrate film, the lower layer (3a) of the transparent printing layer (2a) or the upper layer (3b) of the transparent printing layer (2) A transparent printed label provided with an absorbent layer (3, 3a, or 3b), and capable of detecting the following defect (B) of the label by the following inspection method (A).
(A) The defect inspection method is a method in which a near infrared ray is applied to a beverage bottle with a transparent printing cylindrical label, and a black shadow formed by absorbing near infrared light in the near infrared absorption layer is imaged with a CCD camera. is there.
(B) Disadvantages of the transparent printing cylindrical label are perforation perforations provided in the label and / or tearing from the folds formed on the label before wearing.
[0008]
The usage form of the said transparent printing cylindrical label (4, 5) provides Claim 2 as a transparent beverage bottle. Each of the above inventions will be described in detail in the following embodiments.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The defect inspecting transparent printing label constituting the main invention will be described.
First of all, the name of a defect-inspecting transparent printed label (hereinafter simply referred to as a defect-inspecting label or label) is given mainly because of the defect that can be effectively inspected, as described above. Is.
The label is composed of a transparent substrate film (1) effective as a label, a transparent printed layer (2 or 2a), and a near-infrared absorbing layer (3, 3a, or 3b). This will be described with reference to this.
This is shown in FIG. 1 (cross section). First, the transparent substrate film 1 will be described.
[0010]
1 is a transparent substrate film, but it may be either heat shrinkable or non-heat shrinkable, but it must be transparent. The higher the transparency, the better, but this is to improve the transparency of the transparent printed layer (2 or 2a) based on red, blue, yellow, etc. The higher the transparency, the better the defect inspection performance. Because it becomes. It is better that the total light transmittance is 70% or more. Heat resistance of about 60 ° C. or higher is also necessary.
[0011]
When the film is heat-shrinkable, the resin as 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 single layer film or a multilayer film having two or more layers.
[0012]
As generally known, the cyclic olefin-based resin is a single polymer obtained by polymerization (ring-opening / hydrogenation or addition reaction) of a cyclic olefin monomer found in norbornene, tetracyclododecene or derivatives thereof, etc. Examples thereof include a copolymer of a cyclic olefin monomer and an α-olefin such as ethylene and propylene, and a resin obtained by blending a linear polyolefin resin with this copolymer. In particular, this blend resin is more preferable. The linear polyolefin resin selected by the blend resin is more preferably a linear low density polyethylene and / or a linear ultra low density polyethylene, and the blend ratio thereof is also 100% by weight of the cyclic olefin resin (single or copolymer). It is good to set it as 10-100 weight part with respect to a part.
The acyclic olefin resin is usually simply referred to as an olefin resin, and preferable resins include propylene-ethylene random copolymer and propylene-ethylene-1-butene random copolymer.
Moreover, when the transparent base film 1 is non-heat-shrinkable, preferable resins include polyethylene terephthalate resin, polypropylene resin, and syndiotactic polystyrene resin.
In addition, it is expressed here as a system resin because it may be copolymerized or may be a resin blended with other resins as well as a single resin.
[0013]
The heat shrinkability and non-heat shrinkability of the transparent substrate film 1 depend on the form of use of the final defect-inspectable label to be packaged (container, etc.). If heat shrinkability is required, this is a stretching operation. By stretching at a required magnification in the longitudinal and / or transverse direction.
Regarding the stretching in the vertical and horizontal directions, when the label is cylindrical, it is generally stretched more in the horizontal direction (circumferential direction) than in the vertical direction. This stretch ratio is about 2 to 10 times in the transverse direction, desirably 3 to 7 times, and 1 to 2 times in the longitudinal direction.
On the other hand, in the case of non-shrinkage, generally, a biaxial stretching operation is performed, and this is imparted by performing heat setting (at least higher than the mounting temperature to the container) after this stretching.
[0014]
The thickness of the transparent substrate film 1 needs to be determined in consideration of the strength as supportability and appropriate flexibility in addition to the type of resin used, but in most cases, the thickness can be adjusted to about 20 to 100 μm. .
[0015]
The transparent substrate film 1 is formed using a commonly used T-die melt extruder, and the stretching (this stretching may be performed separately) may be performed continuously with the melt extrusion or separately. Sometimes it is done. The stretching means at that time is either a tenter stretching generally performed or a combination of roll stretching and tenter stretching. Of course, it is permissible for the film to contain a small amount of various additives (for example, weathering agent, antioxidant, antistatic agent, etc.).
[0016]
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 position of the film outer surface 3 opposite to the transparent printing layer (2) provided on one side of the transparent substrate film 1, the position of (3a) indicated by (1B), that is, the lower layer of the transparent printing layer (2a), The third is the position (3b) indicated by (1C), that is, the upper layer of the transparent printing layer (2).
Basically, it may be provided at any one of these positions, but it is not avoided to provide at any two or more positions.
Among these one positions, the case of (1A) is preferable. This is because the direct contact with the transparent print layer may not give a good result with respect to the print image quality.
[0017]
The near-infrared absorbing layers 3, 3a, 3b are formed by coating a resin solution prepared by mixing and dispersing a predetermined amount of a near-infrared absorber. In this case, first, a resin (matrix) in which the absorbent is dispersed is selected. This includes adhesion to the transparent substrate film 1, mixed dispersibility with the near infrared absorbent, transparency, and heat resistance (60). It is necessary to consider coating properties and the like.
Examples of the resin satisfying such conditions include 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. Acrylic, urethane-based, acrylic-urethane-based thermoplastic resins, thermoplastic copolyester resins, etc., which are dissolved in chloroform or the like alone or in an appropriate mixed solvent thereof.
[0018]
The near-infrared absorber is a near-infrared dye having a maximum peak wavelength at about 800 to 1100 nm, and includes organic dyes, metal oxides, and organometallic complexes. However, in the present invention, an organic dye is desirable in consideration of compatibility with the resin and solubility in the organic solvent. For example, when classified according to the structure, anthraquinone, phthalocyanine, naphthoquinone, (naphthal) cyanine, polymer condensed azo, and pyrrole are listed. Which of these is selected is selected in view of matching with the wavelength of the infrared light source used for defect inspection. Therefore, in order to achieve complete absorption, one type may be sufficient, and it may be better to mix two or more types.
[0019]
The amount of the near-infrared absorber added to the resin needs to be determined based on a balance with transparency as well as an infrared absorption effect. In terms of transparency, since the absorbent itself is colored, if it increases, it affects the overall transparency and also affects the image quality of the printed image. The balance between the two is about 1 to 10% by weight (based on solids), preferably 3 to 7% by weight.
[0020]
The layer thickness of the near-infrared absorbing layers 3, 3a, 3b also needs to be determined based on a balance between the infrared absorbing effect and transparency, but in the range of the addition amount of the near-infrared absorbing agent, 1 to 10 μm. , Preferably 2 to 8 μm (when the amount of the near-infrared absorber is large, set in a thin direction).
[0021]
The near-infrared absorbing layers 3, 3a, 3b are formed by first dissolving and mixing a predetermined amount of the resin and the near-infrared absorbing agent uniformly with a common solvent of both, and then adjusting the viscosity to an appropriate solution according to the coating means. adjust. Then, it is formed on the entire surface of the transparent substrate film 1 by the gravure printing method, the bar coater method, or the screen printing method in some cases, and dried (hot air or ultraviolet rays).
In order to increase the adhesion to the film 1, if necessary, it may be pretreated by means generally known as pretreatment such as corona discharge.
[0022]
Next, formation of the transparent printing layers 2 and 2a will be described.
First, the transparency of the printed layer is that at least near-infrared light is absorbed by the near-infrared absorbing layer 3, 3 a or 3 b to become substantially black shadow, and this black shadow light is transmitted through the printed layer. It needs to be enough that the CCD camera can catch it.
The effect of the printed 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 when each color is overprinted with 175 lines is used. Is about 3%. Even at such a low transmittance, the transmission of near-infrared light is not blocked. This is because near-infrared light is absorbed by the near-infrared absorbing layer and becomes a black shadow, which passes through the three-color solid overprinted portion and becomes a black shadow as it is, which is picked up and detected by the CCD camera together with the above-mentioned defects. In other words, even if three-color overprinting is performed as a printed image, there is no effect on defect inspection, so any printing design can be made (of course, one or two colors are the same). From the result of the three-color overprinting, the minimum transparency of the printed layer can be said to be 3% in terms of the total light transmittance, but it is not limited thereto.
Note that the total light transmittance in the case of a single layer of 175 line solid printing with black ink is slightly over 8%. However, this black printed layer has a slight influence on the imaging accuracy of the CCD camera, but the above-mentioned defect cannot be detected. Not to say.
[0023]
The transparent printing layer may be printed by a screen printing method or the like, but usually by a gravure printing method. As the printing ink, a water-based or oil-based acrylic or urethane resin ink generally used is used.
[0024]
The layer thickness of the transparent printing layer 2 or 2a is 0.5 to 10 [mu] m, preferably 1 to 5 [mu] m. With this layer thickness, not only the printing image quality but also the transparency can be secured. When two to three colors are overlaid, it is desirable to set each color so that it is within this thickness range.
[0025]
The transparent label having the above configuration is a transparent label having excellent defect inspection performance that can detect even a minute defect that could not be detected in the past, but the usage form of this label (although it may be a single non-shrinkable flat label) Use in the heat-shrinkable or non-heat-shrinkable transparent cylindrical label (4, 5) provided in claim 2 is preferred.
By saying the cylindrical label, the object to be packaged is generally a rigid or semi-rigid transparent container having a trunk (circular or polygonal), a bottom and a mouth. The transparency of the package itself may be about 10% or more in terms of total light transmittance, and therefore may be (transparent) colored. The packaged item is generally a hard or semi-rigid beverage bottle such as a glass bottle or a PET bottle. This cylindrical label is wound around the bottle.
Even if the bottle is filled with a colored beverage, there is no problem as long as it has a transmittance of about 10% or more.
[0026]
Here, the heat-shrinkable transparent cylindrical label (4) or the non-heat-shrinkable transparent cylindrical label (5) is generally used as follows, taking the case of the beverage bottle as an example.
That is, in the transparent cylindrical label (4), there is an unevenness in the body part, or when it is worn around the body or from the bottom to the shoulder and neck, and in the transparent cylindrical label (5), This is a case where it is wound only on the trunk. Of course, the heat-shrinkable cylindrical label is used in any case. Therefore, it can be said that the heat-shrinkable cylindrical label is more preferable because it has a wider application range.
After the bottle is used up, perforations are generally cut vertically on the label in order to separate and recover the main body and the mounting label.
[0027]
The heat-shrinkable transparent label before being attached to the transparent beverage bottle is exemplified in front views of FIGS. That is, it is a state of a label that is formed into a cylindrical shape before wearing. Here, 4a is a close contact portion where both ends are polymerized and bonded.
On the other hand, the non-heat-shrinkable transparent label before wearing on the transparent beverage bottle is exemplified by the drawings (2B) and 5 (plane). Unlike the heat-shrinkable transparent cylindrical label, this is not formed into a cylindrical shape in advance, but is worn while being wound on the bottle, so that it is in a flat state. This winding and wearing is performed by the heat-sensitive adhesive layer 5a provided on both inner side surfaces. Hereinafter, this 5 is referred to as a developed non-heat-shrinkable transparent cylindrical label.
In addition, 4b and 5b are perforations and are torn from here and separated from the main body.
[0028]
The heat-shrinkable transparent cylindrical label 4 or the development 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 the both ends thereof are heated with a solvent or heat. The polymer is closely attached and molded into a cylindrical shape, which is once folded into a flat shape and taken up by a roll. Therefore, it is inevitable that the folds are creased on the both sides by being wound on the roll, and the folds remain even after being wound around the bottle. In particular, there are many tear defects other than perforations from this fold. The cylindrical label wound around the roll is cut transversely to a predetermined size, opened into a cylindrical shape, inserted into the 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-thermal 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, when it is discontinuous, the heat-sensitive adhesive layer 5a is formed in advance and is wound up in a roll shape. After that, unwind it as needed and wear it once. Therefore, by taking up with a roll, the adhesive layer is generally provided with blocking means.
When this is continuous, first, the heat-sensitive adhesive layer 5a is formed, then cross cut into a predetermined size, and one end of the heat-sensitive adhesive layer 5a is attached and fixed to the body of the bottle waiting for this, Next, the bottle is rolled while rotating to polymerize the other end of the heat-sensitive adhesive layer 5a. The one-end attachment fixing and the other-end polymerization are preliminarily heated to develop adhesiveness. This series of processes is performed continuously.
Regarding the above-mentioned drawbacks, the non-heat-shrinkable transparent cylindrical printing label does not have a crease as in the case of the heat-shrinkable transparent cylindrical printing label, so that there is no tearing defect caused by this.
[0029]
The inspection means for the label having the defect is performed as follows, for example.
A transparent beverage bottle wearing the transparent cylindrical label 4 or the developed non-heat-shrinkable transparent cylindrical label 5 is centered, and near-infrared LEDs (light sources) and a CCD camera are arranged on the front and back of the bottle to transmit the transmitted light. This is done by taking an image and processing the image. The transmitted light appears as a black shadow when there is no defect, and when there is a defect, that portion is reflected brightly so that the image can be identified.
[0030]
In addition, in order to detect the unevenness of the resin coating, a method using a resin containing a fluorescent dye is known. However, the present inventors changed this to the near infrared absorption layer of the present invention, and changed the fluorescence absorption. It was tested as before.
The result is that the inspection itself must be constantly performed in a dark room, the workability is not good and it is not productive, the defects that can be detected are not clearly imaged, and there is a limit to the size that can be copied, etc. In addition, when a beverage bottle is displayed at a storefront, a fluorescent color is emitted, so it has been confirmed that it does not give a pleasant feeling and the above problem cannot be solved.
[0031]
【Example】
Hereinafter, the present invention will be described in more detail with reference to examples.
[0032]
(Example 1)
First, the following materials were prepared.
● Transparent substrate film 1 (hereinafter referred to as substrate film)
A roll-wrapped film obtained by cutting a polyester heat-shrinkable film (thickness 50 μm) made of Eastman Chemical Co., Ltd., PETG 50% by weight and Kanebo Gosei Co., Ltd., FGS10 50% by weight into a width of 300 mm.
The total light transmittance of the film is about 88%, and the heat shrinkage is, for example, 43% horizontal and 3% vertical at 80 ° C. hot water / 10 seconds. It has characteristics of 51% horizontal and 5% vertical at 90 ° C. warm water / 10 seconds.
● Coating solution for near-infrared absorbing layer 3
Use an oil-based acrylic transparent resin liquid (manufactured by Toyo Ink Manufacturing Co., Ltd., oil-based gravure printing ink / LP super, dissolved in a mixed solvent of toluene and ethyl acetate with a solid content of 30% by weight). A weight-soluble (soluble) phthalocyanine-based near-infrared absorber (manufactured by Nippon Shokubai Chemical Industry Co., Ltd., TX-EX-906B, maximum absorption wavelength 922 (toluene)) was added and dissolved uniformly. Hereinafter, it is referred to as a near infrared coating solution.
● Printing ink for transparent printing layer 2,
Using red, blue and yellow water-based acrylic gravure ink (Aqua Eco-series manufactured by Toyo Ink Manufacturing Co., Ltd.), and diluting each color ink with a mixed solvent of water and IPA (volume one to one) Adjusted to an appropriate gravure ink concentration (about 2 Pa · s).
[0033]
Next, a near-infrared coating solution was coated on the entire surface of the substrate film by gravure printing, followed by heat drying (hot air drying tunnel at 50 to 55 ° C.). The desired near-infrared absorbing layer 3 was formed with sufficient adhesion, and the layer thickness was 2.2 μm. Hereinafter, it is referred to as a near infrared absorbing substrate film.
[0034]
Next, gravure printing (175-line gravure plate) with the yellow, blue and red printing inks was performed on the opposite surface of the near infrared absorbing substrate film. The printing here was printing in a solid image for each color in the order of yellow, blue, and red, and after each color printing, drying was performed at 45 ° C. to superimpose the three colors. Each color was laminated with sufficient adhesion. The total thickness of the printed layer was 4.0 μm, and the total light transmittance was 3.5%.
[0035]
In addition, the following test was performed to confirm the near infrared absorption ability of the printing film.
A part of the printing film is cut (100 × 100 mm) and hung vertically, and a near-infrared LED light source (AL-402.2. 2 mW / peak wavelength of 910 nm arranged in a plane at intervals of 5 mm in length and width), and a CCD camera connected to a monitor was disposed on the opposite side of the printed layer 2. Next, all the light sources were turned on, the light source was turned on, and the transmitted light was picked up with a CCD camera placed on the opposite side, which was displayed on a monitor and observed. As a result, no transmitted light was observed 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 reliably inspecting the presence or absence of the above-mentioned defects.
[0036]
Next, both ends of the printing film were first trimmed by 40 mm each to a width of 220 mm, and then adhered and sealed using an organic solvent under the following conditions to form a cylindrical film.
At the same time that the both ends of the 220 mm wide printing film (printed surface is inside) are folded inward so that both ends are in the center, the both ends are superposed at the same time, and at the joints 1, 3 -Dioxolane and n-hexane were mixed at a ratio of 10 to 1 (volume), applied, and passed through a heated (70 ° C) nipping roller, and heat-pressed to form a cylindrical film. The formed cylindrical film was wound up on a roll while being folded flat on both sides.
The sealing means here is performed by the organic solvent sealing method, but it can also be sealed by other ultrasonic methods. Which one is selected is determined in consideration of the type of the transparent substrate film 1 and workability.
[0037]
Next, while opening the continuous cylindrical film wound around the roll, a perforation is 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. The film was continuously cut in units of 100 mm and processed into a cylindrical film for bottle mounting. Then, take out one piece of this cylindrical film, preliminarily provide defects in the perforation and crease, and insert it into a circular PET bottle (diameter 65 mm, cylinder length 85 mm) with the printed part inside (body angle) Then, heat shrinkage (two-step heating at 85 ° C. for 5 seconds and 95 ° C. for 7 seconds) was performed in a steam tunnel. This wearing state is shown in FIG. 3 (front view).
In the figure, 6 is a (bottle angle) circular PET bottle body, 7 is a transparent tubular printed label that is shrink-fitted and fixed, 7a a flat hole formed by joining two adjacent perforations (hereinafter referred to as Defect 1), Reference numeral 7b denotes a breaking defect (hereinafter referred to as defect 2) made by breaking a crease in advance. Hereinafter, this bottle is called a defect bottle.
In addition, as a comparative sample, it was obtained by shrink-fitting and fixing to a (bottle angle) circular PET bottle in the same manner using the cylindrical film not provided with the above-mentioned defects. Hereinafter, this bottle is referred to as a comparative bottle.
[0038]
Then, the comparative bottle and the defect bottle were filled with drinking water, and the next defect inspection was performed.
In the defect inspection here, the planar near-infrared LED light source and the CCD camera used above were used and displayed on a monitor and confirmed by visual inspection.
That is, the comparative bottle and the defect bottle were placed side by side, and the above-mentioned planar near-infrared LED light source was suspended 3 cm apart (the defect bottle is opposite to the defect surface). On the opposite side, one CCD camera was placed 25 cm apart from each other and connected to a monitor. Next, the light source was turned on, and the transmitted light was imaged with a CCD camera, which was projected on a monitor and observed. The result was as shown in FIG. In the figure, (4A) is an image of a comparative bottle, and (4B) is an image of a defect bottle.
In the comparative bottle, the normal perforation can be visually recognized with a brightness that can be clearly distinguished in the dim shade (near infrared absorption layer). Corresponding defects are shown in brightness. Since this result can immediately confirm the presence or absence of a defect, it can also be automatically inspected.
In the figure, the image 8 is an overlapped portion at both ends, which appears blacker than the dark shaded portion, and the white cap (unnumbered) appears completely black. The fact that the image of 8 and the cap can be clearly seen indicates that it can also be used for the inspection of the label wearing position.
[0039]
【The invention's effect】
Since this invention is comprised as mentioned above, there exist the following effects.
[0040]
With regard to transparent printing labels, which are difficult to detect with conventional defect inspection methods, it is possible to inspect fine defects, leading to further quality improvement, and the like.
[0041]
In addition, it is possible to check the correctness of the label mounting position.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a configuration example 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 cylindrical label.
FIG. 4 is a monitor image in which Example 1 is imaged.
DESCRIPTION OF SYMBOLS 1 ... Transparent substrate film 2, 2a ... Transparent printing layer 3, 3a, 3b ... Near-infrared ray absorption layer 4 ... Heat-shrinkable cylindrical label 5 ··················· Unfoldable non-heat-shrinkable cylindrical label 6 ·····························································

Claims (3)

A transparent printing layer (2 or 2a) on one surface of the transparent substrate film (1),
Any position of the outer surface (3) of the transparent substrate film opposite to the transparent printing layer (2), the lower layer (3a) of the transparent printing layer (2a), or the upper layer (3b) of the transparent printing layer (2) A transparent printed label provided with a near infrared absorbing layer (3, 3a, or 3b) containing a near infrared absorbing agent ,
The transparent substrate film is composed of at least one selected from the group consisting of a copolyester resin, a cyclic or acyclic olefin resin, a polystyrene resin, and a polyvinyl chloride resin,
The near-infrared absorbing layer has a near-infrared absorber in an amount of 1 to 10 weights in at least one resin selected from the group consisting of acrylic resins, urethane resins, acrylic-urethane resins, and thermoplastic copolymer polyester resins. % (Based on solid content), and the near infrared absorption layer has a thickness of 1 to 10 μm,
The transparent printing layer contains at least one selected from the group consisting of water-based or oil-based acrylic and urethane resin inks,
The transparent printing cylindrical label which can detect the following fault (B) of a label with the following inspection method (A).
(A) The defect inspection method is a method in which a near infrared ray is applied to a beverage bottle on which a transparent printing cylindrical label is mounted, and a black shadow formed by absorbing near infrared light in a near infrared absorption layer is imaged with a CCD camera. .
(B) Disadvantages of the transparent printing cylindrical label are perforation perforations provided in the label and / or tearing from the folds formed on the label before wearing. The near-infrared absorber is at least one near-infrared dye selected from the group consisting of anthraquinone, phthalocyanine, naphthoquinone, (naphthal) cyanine, polymer condensed azo, and pyrrole. Item 2. The transparent printing cylindrical label according to Item 1. The transparent drink bottle which mounted | wore with the transparent printing cylindrical label which enables the defect inspection on the label of Claim 1 or 2 .

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