JP6222172B2 - label - Google Patents

Description

The present invention relates to a label having a pattern-like adhesive layer (adhesive layer) on the back surface of a substrate, and more specifically, the adhesive does not ooze out from the pattern of the adhesive layer, and a special adhesive. The present invention relates to a label having a part where adhesiveness is partially lowered without using an agent and a part where adhesive strength is not lowered.

There is a pressure-sensitive adhesive label in which the surface of the pressure-sensitive adhesive layer previously applied to the entire back surface of the base material is printed with printing ink so as not to have adhesiveness. (Patent Document 1) In the case of this invention, since the thickness of the printing layer is smaller than the thickness of the pressure-sensitive adhesive layer, there is a problem that the pressure-sensitive adhesive oozes out over time. In particular, when UV curable ink is used as the printing ink, there is a problem that the adhesive layer cracks due to curing shrinkage of the UV curable ink, and the adhesive oozes out from the crack.

In addition, by adding a component that reacts and solidifies the pressure-sensitive adhesive layer to the printing layer, only the portion of the pressure-sensitive adhesive layer corresponding to the printing layer is solidified, and a patterned pressure-sensitive adhesive layer other than the solidified portion remains. There are labels to use. (Patent Document 2)
In the case of this label, it is necessary to prepare a special pressure-sensitive adhesive and printing ink in order to form a pattern, and there is a problem that a special component is required even in a portion where it is not desired to be solidified. In addition, there is a problem that cannot be coped with when it is desired to create a part having a partially reduced adhesive strength.

Further, in an adhesive print sheet in which an adhesive layer that is inactive under normal conditions is provided on the surface of the sheet substrate, the adhesive of the laser irradiation unit is obtained by laser irradiation of the sheet substrate unit having the adhesive layer. Patent Document 3 describes that processing lines such as predetermined sewing lines, cut lines, and half cut lines formed by sublimation removal of layers and sheet base materials are applied.
In this adhesive print sheet, a line such as a sewing line is processed by laser irradiation, and there is a problem that it is impossible to create a part in which the adhesive strength is partially lowered as in the above case.
Japanese Utility Model Publication No. 58-46429 Japanese Patent No. 3769697 JP-A-9-268273

Accordingly, the present invention relates to a label having a layer (adhesive layer) having a patterned sticky on the back surface of the base material, without adhesive oozes from the pattern of the pressure-sensitive adhesive layer, also special without the use of adhesive or the like, also partially the adhesive was low portion, adhesion is an object to provide a label having a portion which is not reduced.

In order to solve the above problems, the present onset Ming, on one side of the substrate, the label having an adhesive layer coated with pressure-sensitive adhesive of the same composition, the pressure-sensitive adhesive layer, any adhesive strength in normal state It is either a pressure-sensitive adhesive, a wet-sensitive adhesive, or a heat-sensitive adhesive that is activated by any one of pressurization, humidification, and heating and exhibits adhesive strength, and is cut by laser light. a possible adhesive layer, and a strong bonding portion where the adhesive layer is highly adhesive in the state in which the thickness has been applied in a range of 50 m to 200 m, substantially in thickness of the number or the adhesive layer is no μm a non-adhesive portion which adhesive force is not state, the state becomes weakly joined portion between the adhesive strength of the non-adhered portion between the strong bonding portion in 70% or less of the thickness of the thickness of the strong bond portion , And the like.

According to the onset bright, yet label having an adhesive layer coated with pressure-sensitive adhesive of the same composition, and strong bonding portion, and a weakly joined portion, and the unbonded portion may coexist in a single label.

It is sectional drawing of the label which shows one Example of this invention. It is sectional drawing of the label which shows one Example of this invention. It is sectional drawing of the label which shows one Example of this invention. It is the schematic of the label which shows one Example of this invention. It is the schematic of the label which shows one Example of this invention. It is the schematic of the label which shows one Example of this invention. It is the schematic of the label which shows one Example of this invention. It is the schematic which shows the manufacturing method of the label which shows one Example of this invention. It is the schematic explaining the apparatus used when enlarging a laser irradiation area. It is a graph which shows the thickness of an adhesive layer, and the relationship of adhesive force. It is the schematic which shows the structure which is an example of a laser processing apparatus. It is sectional drawing which shows the manufacturing method of the label which shows one Example of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view of a label showing one embodiment of the present invention.
On the base material 2, it has a pressure-sensitive adhesive layer 3, and the pressure-sensitive adhesive layer 3 has a temporary bonding part (weak bonding part) 5 as a part that has been scraped off by laser irradiation, and has been irradiated with laser. The temporary adhesive portion 5 and the strong adhesive portion 6 coexist on one label 1. As for the said temporary adhesion part 5, the adhesive layer 3 is scraped off from the surface side by laser irradiation, and the adhesive force is falling. In FIG. 1, the strong adhesion portion 6 and the temporary adhesion portion 5 exist in one label 1. However, the present invention is not limited to this, and for example, the adhesive portion of the entire label can be used as the temporary adhesion portion.

FIG. 2 is a sectional view of a label showing one embodiment of the present invention.
The adhesive layer 3 is scraped off by the laser irradiation on the base material 2 at the portion not subjected to the laser irradiation, and has an adhesive force capable of temporarily adhering with a decrease in the adhesive force. The adhesive layer 3 is scraped off by the portion, that is, the temporary adhesive portion 5 and further by laser irradiation, the adhesive layer 3 is lost, and the non-adhered portion 7 is formed as a portion having no adhesive force on one label 1. Coexist. In FIG. 2, the non-bonded portion 7 is shown in a state where the pressure-sensitive adhesive layer 3 is scraped off and the pressure-sensitive adhesive layer 3 is not present. However, the present invention is not limited to this, but the pressure-sensitive adhesive layer is thin (approximately several μm thick). It can also be made substantially non-sticky. In FIG. 2, the strong adhesion part 6, the non-adhesion part 7, and the temporary adhesion part 5 exist in one label 1, but not limited thereto, for example, only the non-adhesion part 7 and the temporary adhesion part 5. Or only the strongly bonded portion 6 and the non-bonded portion 7 can be present.

FIG. 3 is a sectional view of a label showing one embodiment of the present invention.
A temporary adhesive portion 5 having an adhesive layer 3 on the substrate 2, the adhesive layer 3 being scraped off by laser irradiation and having reduced adhesive force, and a strong adhesive portion of a portion not irradiated with laser 6 coexist on one label 1. And the release paper 4 is laminated | stacked so that all the adhesive layers of the strong adhesion part 6 and the temporary adhesion part 5 may be covered. The label 1 shown in FIG. 3 is practically used because the entire surface of the pressure-sensitive adhesive layer 3 is protected by the release paper 4 so that unnecessary portions and the pressure-sensitive adhesive layer do not adhere to waste during the handling of the label. It is highly probable.

FIG. 4 is a schematic view of a label showing one embodiment of the present invention, FIG. 4 (1) is a plan view of the label, and a cross-sectional view of L−L ′ of the label is shown in FIG. 4 (2). It is a thing. The illustrated label 1 is an example of a delivery slip. An adhesive layer 3 is provided on the back surface of the base 2 excluding both left and right ends (A, B) of the slip, covers the adhesive layer 3, and the base 2 The release papers 4 are stacked in accordance with the size. The illustrated label 1 is a long continuous sheet, and variable information such as a delivery address, a zip code, and a name is printed on the surface of the base material 2 (variable printing).

In label-type slips, an adhesive is generally applied to the entire back surface of a base material, and release papers are stacked to cover the adhesive. Usually, the release paper is not peeled except when the label is attached, but if there is an adhesive at the end of the label when printing with a printer, it will rub when the adhesive is printed, or the printer Adhesive adheres to the contact area with the ink and becomes an obstructive factor such as print stains. On the other hand, it is necessary to remove glue (adhesive) at both ends of the label. Conventionally, when an adhesive is applied to a wide original fabric, desizing is performed at a predetermined interval. However, in this method, when producing labels with a wide variety of widths, it is necessary to manufacture various stocks that have been defatted and stocked, resulting in manufacturing problems.

On the other hand, the present invention is an example in which the pressure-sensitive adhesive layer is scraped off by irradiating the pressure-sensitive adhesive layer with laser, and in this case, the pressure-sensitive adhesive layer at both ends of the label is almost completely removed. . This desizing portion is an unbonded portion. As a result, it is possible to easily form the desizing portion by scraping off the pressure-sensitive adhesive layer by laser irradiation without taking the trouble of desizing at the time of producing the original fabric. In this example, a label with release paper is shown. However, the present invention is not limited to this and can be applied to a so-called linerless label without release paper, and a silicone resin is provided on the surface opposite to the surface on which the pressure-sensitive adhesive layer is provided. A release layer such as a release resin is applied to form a release layer. However, the surface of the label base material provided with a thermosensitive coloring layer is used. In this case, the pressure-sensitive adhesive layer is in contact with the release layer of the substrate and is handled in the form of a rolled up roll, and blocking by the pressure-sensitive adhesive can be prevented by winding. However, at the time of thermal recording, when the label is conveyed by the printer, it is necessary to remove the glue at least at both ends of the label, and the rolls can be rotated and driven so as to sandwich the removed part.

FIG. 5 is a schematic diagram of a label showing one embodiment of the present invention, FIG. 5 (1) is a plan view of the label, and a cross-sectional view of the label taken along line MM 'is shown in FIG. 5 (2). It is a thing. The illustrated label 1 is an example of a delivery slip, and the delivery slip portion has a specification that allows the perforations (8, 9) to be peeled off and separated. The label slip shown in the figure includes both left and right ends (A, B) of the slip, a portion sandwiched between cut perforations 8, 9 of the delivery slip, and a region C near the perforation 8 and a region D near the perforation 9. Then, there is no adhesive layer and the paste is removed. That is, the desizing part is an unbonded part. Moreover, the adhesive layer 3 exists in the area | region where the desizing is not carried out, The release paper 4 according to the magnitude | size of the base material 2 is laminated | stacked covering the adhesive layer 3. As shown in FIG. The illustrated label 1 is a long continuous sheet, and variable information such as a delivery address, a zip code, and a name is printed on the surface of the base material 2 (variable printing).

As described above, if a label type slip is printed with a printer and there is an adhesive at the end of the label, it will rub when the adhesive is printed, or the adhesive will adhere to the contact area with the printer. As a result, it becomes an obstruction factor such as print smear. On the other hand, it is necessary to remove glue (adhesive) at both ends of the label. Conventionally, when an adhesive is applied to a wide original fabric, desizing is performed at a predetermined interval. However, in this method, when producing labels with a wide variety of widths, it is necessary to manufacture various stocks that have been defatted and stocked, resulting in manufacturing problems.

On the other hand, in the present invention, both ends of the label (A, B), the portion sandwiched between the cut perforations 8, 9 of the delivery slip, and the area C near the perforation 8 and the vicinity D of the perforation 9 Then, desizing was performed. That is, the pressure-sensitive adhesive layer in the designated area is irradiated with a laser to scrape off the pressure-sensitive adhesive layer, and in this case, almost all the pressure-sensitive adhesive layer is removed. As a result, it is possible to easily form the desizing portion by scraping off the pressure-sensitive adhesive layer by laser irradiation without taking the trouble of desizing at the time of producing the original fabric. In the above, a label with release paper is shown, but not limited to this, it can be applied to a so-called linerless label without release paper, and a silicone resin or the like is provided on the surface opposite to the surface on which the adhesive layer is provided. A release layer is formed by applying a release resin. However, the surface of the label base material provided with a thermosensitive coloring layer is used.

FIG. 6 is a schematic view of a label showing one embodiment of the present invention, FIG. 6 (1) is a plan view of the label, and a cross-sectional view of the label along N-N 'is shown in FIG. 6 (2). It is a thing. The illustrated label 1 is an example of a delivery slip. The delivery slip portion has a specification in which the perforations (8, 9) can be peeled off and separated, and is the same as the label of FIG. 5, but the label of FIG. 1 has a pseudo-adhesive specification on the delivery slip. That is, pseudo-adhesion means temporary adhesion that can be releasably adhered.

The label shown in FIG. 6 is a single label formed with a strongly bonded portion and a weakly bonded portion (temporary bonded portion). Conventionally, it is weakly bonded to a coating portion of a strong adhesive that is strongly bonded. It was necessary to partially coat the coating part of the weak adhesive. However, in the present invention, a common raw material coated with a strong adhesive is used on the entire back surface of the label, and according to the desired specifications, the strong adhesive layer is irradiated with a laser to scrape the adhesive layer, The weak adhesive layer or both ends of the label could be in a state where the adhesive layer was removed. In this way, by changing and adjusting the amount of the pressure-sensitive adhesive layer to be scraped off by laser irradiation according to the application under the condition of using a common raw material, the weakly bonded portion (temporary bonded portion) and the pressure-sensitive adhesive layer are completely removed. No part (non-adhered part) and strong adhesive part could be arranged freely.

The illustrated label slip has no adhesive layer at both left and right ends (A, B), and is glued. In addition, the adhesive layer is scraped off at the portion sandwiched between the cut perforations 8 and 9 of the delivery slip, and in the vicinity of the perforation 8 and the vicinity D of the perforation 8, and the thickness thereof is reduced. The part excluding the desizing part and the temporary adhesive part has the original pressure-sensitive adhesive layer 3, covers the pressure-sensitive adhesive layer 3, and is peeled off in accordance with the size of the base material 2. Paper 4 is laminated. The illustrated label 1 is a long continuous sheet, and variable information such as a delivery address, a zip code, and a name is printed on the surface of the base material 2 (variable printing).

As described above, if a label type slip is printed with a printer and there is an adhesive at the end of the label, it will rub when the adhesive is printed, or the adhesive will adhere to the contact area with the printer. As a result, it becomes an obstruction factor such as print smear. On the other hand, it is necessary to remove glue (adhesive) at both ends of the label. Conventionally, when an adhesive is applied to a wide original fabric, desizing is performed at a predetermined interval. However, in this method, when producing labels with a wide variety of widths, it is necessary to manufacture various stocks that have been defatted and stocked, resulting in manufacturing problems.

On the other hand, in the present invention, desizing is performed at both ends (A, B) of the label, and the portion sandwiched between the cut perforations 8, 9 of the delivery slip and the perforations 8 Temporary adhesion portions are formed in the region of the vicinity C and the vicinity D of the perforation 9. That is, by irradiating the pressure-sensitive adhesive layer in the designated area with a laser, the pressure-sensitive adhesive layer is scraped off, almost all of the pressure-sensitive adhesive layer is removed to form a desizing portion, and a laser is applied to the pressure-sensitive adhesive layer. By irradiating, the pressure-sensitive adhesive layer is scraped off to form a temporary adhesion portion. As a result, it is possible to easily form the pasting portion and the temporary bonding portion by scraping the pressure-sensitive adhesive layer by laser irradiation without taking the trouble of performing pasting at the time of producing the original fabric. In the above, a label with release paper is shown, but not limited to this, it can be applied to a so-called linerless label without release paper, and a silicone resin or the like is provided on the surface opposite to the surface on which the adhesive layer is provided. A release layer is formed by applying a release resin. However, the surface of the label base material provided with a thermosensitive coloring layer is used.

FIG. 7 is a schematic view of a label showing one embodiment of the present invention, FIG. 7 (1) is a plan view of the label, and a cross-sectional view of the label is shown in FIG. 7 (2). The illustrated label is a single label formed with a strong adhesion portion and a weak adhesion portion (temporary adhesion portion). As a bi-fold postcard, the label is folded at the central perforation 15 and pasted at the temporary adhesion portion 5. In addition, the entry field can be concealed, which is a so-called concealment postcard. The weakly bonded portion (temporary bonded portion) is a portion where the pressure-sensitive adhesive layer 3 is scraped off by laser irradiation. Further, the strong adhesion portion is a portion that is not irradiated with a laser in the original state of the pressure-sensitive adhesive layer provided between the base material 2 and the release paper 4.

Conventionally, it has been necessary to partially coat and manufacture a coating part of a strong pressure-sensitive adhesive that provides strong adhesion and a coating part of a weak pressure-sensitive adhesive that provides weak adhesion. However, in the present invention, a common raw material coated with a strong adhesive is used on the entire back surface of the label, and the strong adhesive layer at a predetermined location is irradiated with laser in accordance with the specifications of the concealing postcard, The agent layer was scraped off to form a weakly bonded part. The label which is a concealed postcard shown in the figure has a questionnaire entry column on the left half, and the right half has the release paper 4 peeled off at the center cut position so that the entire left half including the adjacent questionnaire entry column is hidden. In addition, the left half and the right half can be folded at the fold perforation 15 and temporarily attached by the weakly bonded portion 5 on the right half to be used as a postcard.

The concealed postcard label shown in FIG. 7 can be produced by a manufacturing method as shown in FIG. It is a label consisting of a base material / adhesive layer / release paper, and uses a common raw material that is coated with a strong adhesive on the entire back surface of the base material and is provided with an adhesive layer. A certain winding is supplied from the paper feeding unit 11 of the manufacturing apparatus. However, a release paper cutting portion is provided at the center of the original fabric, and the original fabric supplied from the paper supply unit 11 is peeled off and wound up using the cut portion. The laminate with the pressure-sensitive adhesive layer exposed in the right half as shown in FIG. 7 (1) is transported, and the laser beam is irradiated to the pressure-sensitive adhesive layer by a laser processing apparatus to scrape off the pressure-sensitive adhesive layer and remove the weakly bonded portion. Form. Moreover, a folding sewing machine can be formed by laser irradiation at the center of the base material of the label. Release paper is supplied from the take-up so as to cover the formed weakly bonded portion, and is bonded (applied). Thereafter, the long laminate of substrate / pressure-sensitive adhesive layer (including weakly bonded portion) / release paper is sheet-cut to obtain a label which is a concealing postcard of the present invention.

Each layer constituting the label of the present invention will be described in detail below.
(Base material)
The substrate 2 is not particularly limited as long as it can support the pressure-sensitive adhesive layer and maintain the handleability of the label. For example, fine paper, art paper, coated paper, cast coated paper, synthetic resin or emulsion impregnated paper, synthetic rubber latex impregnated paper, synthetic resin internal paper, paper such as cellulose fiber paper, polyolefin (polyethylene, polypropylene, etc.), Plastic sheets of various synthetic resins such as polystyrene, polycarbonate, polyethylene terephthalate, polyvinyl chloride, polymethacrylate, etc., white opaque films formed by adding white pigments and fillers to these synthetic resins, or fine inside the substrate A film (so-called synthetic paper) having voids (microvoids) can be used as a substrate.

In addition, the surface of the substrate (the surface opposite to the surface on which the pressure-sensitive adhesive layer is provided) can be recorded by thermal coloring recording, thermal transfer recording, non-impact recording such as inkjet recording, dot impact recording, handwriting, etc. Preferably, paper suitable for these recording methods is used. For example, thermal coloring paper (thermal paper), thermal transfer recording paper, ink jet recording paper, paper having writing properties, and the like. The thickness of the substrate is usually about 3 to 300 μm, and in the present invention, it is preferable to use a substrate having a thickness of about 20 to 175 μm in consideration of handling suitability, laser irradiation suitability, and the like.

(Adhesive layer)
The pressure-sensitive adhesive layer 3 enables a label to be attached to an arbitrary object. Under normal conditions, use pressure-sensitive adhesives, wet-sensitive adhesives, and heat-sensitive adhesives that do not have any adhesive strength and are activated by pressure, humidification, heating, etc. to exert adhesive strength. However, it is preferable to use acrylic, natural rubber, and synthetic rubber adhesives having adhesiveness from the normal state. As the acrylic pressure-sensitive adhesive, one having as a main component an acrylic copolymer having a glass transition temperature of −20 ° C. or lower obtained by copolymerizing two or more kinds of various acrylic esters can be used. If necessary, rosin, rosin derivatives, terpene resin, petroleum resin, corbal, alkylphenol and other tackifiers, softeners such as process oil, carbon black, silicate, calcium carbonate, clay, etc. A filler, a solvent such as toluene, hexane, unleaded gasoline, an anti-aging agent, or the like is appropriately used.

Further, as the natural rubber-based pressure-sensitive adhesive, a material mainly composed of natural rubber and appropriately blended with the above-described tackifier, softener, filler, solvent, anti-aging agent and the like is used. Moreover, as a synthetic rubber adhesive, an SBR adhesive, an isoprene rubber adhesive, an isobutylene rubber adhesive, and the like are preferably used. As the SBR pressure-sensitive adhesive, styrene-butadiene rubber as a main component, and the above-mentioned tackifier, softener, filler, solvent, anti-aging agent and the like appropriately blended are used.

As the isoprene rubber-based pressure-sensitive adhesive, a material mainly composed of isoprene rubber and appropriately blended with the above-described tackifier, softener, filler, solvent, anti-aging agent and the like is used. As the isobutylene rubber-based pressure-sensitive adhesive, a material mainly composed of isobutylene rubber and appropriately blended with the above-described tackifier, softener, filler, solvent, anti-aging agent and the like is used.

The thickness of the pressure-sensitive adhesive layer is 50 μm to 200 μm, and preferably 70 to 150 μm. When the thickness is less than 50 μm, the adhesive strength is reduced, and the pressure-sensitive adhesive layer is scraped off by laser irradiation, and it becomes difficult to form a temporary adhesive portion having a reduced adhesive strength. On the other hand, when the thickness exceeds 300 μm, the adhesive force becomes excessive, causing problems such as difficulty in peeling when peeling from the release paper.

(Release paper)
The release paper 4 is laminated on the pressure-sensitive adhesive layer on the base material, and is formed by providing a release layer on one surface of the paper base material. Examples of the paper substrate include fine paper, art paper, lightweight coated paper, finely coated paper, coated paper, cast coated paper, synthetic resin or emulsion impregnated paper, synthetic rubber latex impregnated paper, synthetic resin internal paper, etc. It is done. The thickness of the paper substrate is about 10 to 200 μm. The release layer can be formed by applying a silicone-based release agent or a wax-type release agent on the above paper base, or by extruding a polyethylene resin or the like. In order to form the release layer uniformly in a thin film, extrusion coating of polyethylene resin is preferable.

(Label manufacturing method)
Hereinafter, a method of manufacturing the label, will be described.
By changing the laser irradiation conditions for the pressure-sensitive adhesive layer, the amount of the pressure-sensitive adhesive layer to be scraped can be changed from the structure of the label provided with the pressure-sensitive adhesive layer on the entire surface of one side of the base material. Is a manufacturing method of a label to be formed so as to produce fewer parts than before laser irradiation. The portion where the thickness of the pressure-sensitive adhesive layer is smaller than that before laser irradiation is preferably 70% or less compared with that before laser irradiation. The means for cutting the adhesive layer by laser irradiation in the present invention, that is, the laser processing means uses YAG laser, carbon dioxide laser, ruby laser or the like as the laser beam, and particularly the YAG laser has a short wavelength and becomes a minute spot. Since it can condense, finer processing is possible and it is preferably used. In the present invention, the terms laser irradiation and laser light irradiation are used, but “laser” and “laser light” have the same meaning, and there is no difference between the terms.

An example of the laser processing means used in the present invention will be described. First, the laser light is condensed by a lens and irradiated to the surface of the pressure-sensitive adhesive layer of the label. At that time, by changing the laser beam irradiation time or the laser output value (laser beam intensity × irradiated area), the depth to be cut, that is, the depth to be cut, in other words, the pressure-sensitive adhesive layer that remains after being processed. The thickness can be adjusted. The intensity of the laser light can be adjusted, for example, from 100 W to 600 W, and the irradiation area can be 50 to 800 μm in diameter. That is, when the laser beam irradiation time is short, the cutting depth is small, and the thickness of the remaining pressure-sensitive adhesive layer is not much different from that before irradiation. And the irradiation time of a laser beam can be lengthened, and the thickness of the remaining adhesive layer can be made small compared with before irradiation. In addition, when the laser beam output is small, the thickness of the remaining adhesive layer remains the same as before irradiation, and the laser beam output is increased to irradiate the remaining adhesive layer thickness. It can be made smaller than before. As described above, the adhesive layer can be easily cut with high accuracy, good reproducibility, and non-contact with the processed portion.

As an example of changing the laser irradiation area, the irradiation area can be increased as follows. An apparatus as shown in FIG. 9 can be used, and a laser light source 31, a lens 33 arranged coaxially with a light beam of the laser light 32 emitted from the laser light source 31, and an optical axis 34 of the lens 33. The first reflector 35a that reflects the laser beam 32 disposed in the direction away from the optical axis 34 and the laser beam 32 reflected by the first reflector 35a are applied to the adhesive layer surface 36 of the label. It is comprised from the optical path change part 35 comprised from the arrange | positioned 2nd reflector 35b.

Laser light 32 emitted from the laser light source 31 is collected by the lens 33 to concentrate the energy density, reflected by the first reflector 35a and the second reflector 35b, and the position of the focal point 40 of the lens 33. , The laser beam 32 becomes the thinnest, spreads again, and is applied to the pressure-sensitive adhesive layer surface 36 that is the irradiation surface.

The optical path changing unit 35 composed of the first reflector 35a and the second reflector 35b rotates around the optical axis 34 of the lens 33 as a rotation axis. Thereby, the laser beam 32 irradiated on the irradiation surface 36 is scanned around the optical axis 34, and the irradiation area of the irradiation surface of the laser beam is expanded, and as a result, the irradiation area can be increased.

Further, the residue of the pressure-sensitive adhesive layer cut by laser irradiation can be sucked and discharged outside using a duct connected to a blower device. In this way, the cut adhesive does not transfer and adhere to the surface of the label, and the processed portion is not stressed and burrs and distortions do not occur. The laser processing means preferably uses a laser beam in an infrared region of about 0.9 to 11 μm, and the portion irradiated with the laser light is heated. The portion irradiated with the laser light is locally heated and cut by blowing off the portion in the liquid phase in the state exceeding the melting point of the portion, and laser processing is performed.

Laser machining means in the manufacturing method of the label is by laser processing apparatus described below, scraping the pressure-sensitive adhesive layer of the label, than the thickness of the adhesive layer as before laser irradiation, at least form a partial or less 70% It is preferable to do. Thereby, it is easy to form a part having an adhesive force that can be temporarily bonded due to a decrease in the adhesive force, that is, a temporarily bonded part. For example, when the thickness of the adhesive layer of the label before laser irradiation is L, the irradiation (radiation) energy, which is the product of the laser light irradiation time and the laser light output value, is W under the laser irradiation conditions. By irradiating the pressure-sensitive adhesive layer with a laser, the pressure-sensitive adhesive layer having a thickness of 0.3 L was scraped off, and a pressure-sensitive adhesive layer having a thickness of 0.7 L remained on the label. This time, when the irradiation (radiation) energy was 2 W, the 0.5 L-thick adhesive layer was scraped off, and the 0.5 L-thick adhesive layer remained on the label.

As described above, under the laser irradiation conditions, the irradiation (radiation) energy to the pressure-sensitive adhesive layer is substantially proportional to the amount of the pressure-sensitive adhesive layer that is scraped off. As a result, if the irradiation (radiation) energy is large, the residual The thickness of the pressure-sensitive adhesive layer is reduced. Therefore, the irradiation (radiation) energy may be secured at a certain level or higher under the laser irradiation conditions so that the thickness of the pressure-sensitive adhesive layer is 70% or less as compared with that before laser irradiation. In addition, the portion where the thickness of the pressure-sensitive adhesive layer is 70% or less compared with that before laser irradiation includes a portion having a pressure-sensitive adhesive force that can be temporarily bonded due to a decrease in the pressure-sensitive adhesive force. This is because, for example, when the thickness of the pressure-sensitive adhesive layer of the label before laser irradiation is L and the adhesive force at this time is M, the thickness of the pressure-sensitive adhesive layer is irradiated by laser irradiation under a certain laser irradiation condition. When the pressure becomes 0.7 L, the relationship between the thickness of the pressure-sensitive adhesive layer and the pressure-sensitive adhesive force is substantially proportional so that the pressure-sensitive adhesive strength becomes 0.7M to 0.9M.

Further, for example, when the thickness of the pressure-sensitive adhesive layer of the label before laser irradiation is L and the adhesive force at this time is M, laser irradiation is performed under a certain laser irradiation condition, and the thickness of the pressure-sensitive adhesive layer is 0. The adhesive strength at 5L is set to be 0.5M to 0.8M. The proportional relationship between the thickness of the pressure-sensitive adhesive layer and the pressure-sensitive adhesive force varies depending on the type of pressure-sensitive adhesive used in the pressure-sensitive adhesive layer.
Proportional relationship M = kL

As an example of the above-mentioned relational expression, for example, an acrylic adhesive made by Toyo Ink (water-based emulsion type, trade name: Orbine BPW6111) as an adhesive, Nisshinbo Co., Ltd. E-03A, tackifier (adhesive) SK-370N manufactured by Harima Kasei Co., Ltd. is used as an imparting agent), and their blending ratio (mass basis) is mixed with pressure-sensitive adhesive / crosslinking agent / tackifier = 1000/11/30, and Oji is used as a base material. With a bar coater, the adhesive layer coating solution of the above mixed solution is applied in a predetermined amount (10 μm, 15 μm, 20 μm at the time of drying) to high-quality paper manufactured by Paper Manufacturing Co., Ltd. OKH (55 kg / sixth edition). The sample was prepared by coating.

The adhesive strength was measured according to the 180 ° peel test described in JIS Z0237. SUS304 was used as the adherend, and measurement was performed after 30 minutes had passed since the adhesive layer of the sample was attached. As a result, the 10 μm thick adhesive layer was 10.9 N / 25 mm wide, the 15 μm thick adhesive layer was 14 N / 25 mm wide, and the 20 μm thick adhesive layer was 18.5 N / 25 mm wide. FIG. 10 plots the data of the pressure-sensitive adhesive layer thickness and the adhesive strength, and draws an approximate straight line so that it passes through the zero point. The adhesive strength (N / 25 mm width) = 0.95 × adhesive layer Thus, k = 0.95 in the above relational expression. And when the thickness of the pressure-sensitive adhesive layer is 70% (14 μm) from the original state, the adhesive strength is 13.3 N / 25 mm width.

In the present invention, the portion having an adhesive force that can be temporarily bonded due to a decrease in the adhesive strength, that is, the portion where the thickness of the pressure-sensitive adhesive layer is 70% or less compared with that before laser irradiation is representative. But not limited to. That is, the temporary adhesion part in the present invention means that the label can be peeled off from the adherend by hand so that the label is not broken after the label is attached to the adherend by the adhesive layer. It is.

As shown in FIG. 11, the laser processing apparatus includes a laser oscillator 20 including a laser head 21, a processing optical system (lens) 22, and a laser power source 23, and a label 1 that is a workpiece. In the horizontal plane of the XY table 24, the XY table 24 that can move in the horizontal plane (XY plane), the Z table 25 that moves the laser head 21 and the processing optical system (lens) 22 in the vertical direction (Z-axis direction), and the XY table 24 The laser processing apparatus 30 includes a main controller 26 that automatically or manually controls the movement operation, the vertical movement operation of the Z table 25, and the oscillation operation of the laser oscillator 20.

By controlling the main controller of the laser processing apparatus as described above, the amount of the adhesive layer to be cut and the position to be cut are changed to form the temporarily bonded portion 5 and the unbonded portion 7 as shown in FIGS. it can. In order to change the cutting position, for example, the position of the optical path changing unit 35 of the apparatus described above may be adjusted. Although not shown in FIG. 11, a detection mark is provided on the label, the detection mark is used as a laser irradiation start detection signal, and the conveyance of the label is controlled to move and adjust the processing position. It is preferable to use a means for doing this together. In particular, when the label is not a single sheet, but a long continuous sheet, when the continuous sheet is continuously irradiated with laser, the processed label is placed on a horizontal table on which a label under the laser head is placed. This is because the label to be processed next can be prepared at the processing position of the horizontal table.

In the manufacturing method of the label, the label is a continuous long sheet, the laser radiation on the continuous sheet performed continuously, it is preferable to wind the label is discharged. Further, the label is a long continuous sheet, the laser irradiation is continuously performed on the continuous sheet, and a roll-like release paper is laminated on the pressure-sensitive adhesive layer and supplied. It is desirable to discharge and wind up the attached label.

An example of this manufacturing method will be described with reference to FIG. The label manufacturing apparatus 10 shown in FIG. 12 has a pressure-sensitive adhesive layer provided on the entire surface of one surface of a base material, and winds up a label on which a release paper is laminated on the pressure-sensitive adhesive layer. The release paper 4 and the laminate of the base material / adhesive layer are separated by a separation unit 12 made of a pair of rolls installed in the paper supply unit 11, and each of them is transported to laminate the base material / adhesive layer. In the body, the pressure-sensitive adhesive layer is scraped off by laser irradiation in the laser processing apparatus 30, and a portion where the thickness of the pressure-sensitive adhesive layer is smaller than that before laser irradiation is formed. Next, the laser-processed base material / adhesive layer laminate and the release paper 4 once separated are laminated again at the united portion 13 composed of a pair of rolls so that they are laminated again. Thus, the label 1 of the present invention is formed and wound up at the discharge portion 14.

DESCRIPTION OF SYMBOLS 1 Label 2 Base material 3 Adhesive layer 4 Release paper 5 Temporary adhesion part 6 Strong adhesion part 7 Non-adhesion part 8, 9 Perforation 10 Label manufacturing apparatus 11 Paper feed part 12 Separation part 13 Merge part 14 Discharge part 15 Fold perforation 20 Laser oscillator 21 Laser head 22 Processing optical system (lens)
23 Laser power supply 24 XY table 25 Z table 26 Main controller 30 Laser processing device 31 Laser light source 32 Laser light 33 Lens 34 Optical axis 35a First reflector 35b Second reflector 35 Optical path conversion unit 36 Adhesive layer surface (irradiation surface) )
40 focus

Claims (1)

In a label having an adhesive layer coated with an adhesive of the same composition on one side of the substrate,
The pressure-sensitive adhesive layer does not have any adhesive force in a normal state, and is activated by any one of pressurization, humidification, and warming, and exhibits pressure-sensitive adhesive, wet pressure-sensitive adhesive, and heat-sensitive adhesive. An adhesive layer that is any of the agents and can be cut by a laser beam,
A strongly bonded portion where the adhesive layer is strongly bonded in a state where the thickness is applied in a range of 50 μm to 200 μm ;
And unbonded portion in a state substantially adhesive strength is not in Thickness of the number or the adhesive layer is not [mu] m,
A weakly bonded portion where the adhesive strength is in a state between the strongly bonded portion and the non-bonded portion at a thickness of 70% or less of the thickness of the strong bonded portion;
A label characterized by having.

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