JPH07121108A - Non-separable label base paper - Google Patents

Abstract

(57) [Summary] [Purpose] Even if the heat-activatable adhesive layer formed on the label base paper is heated, it does not adversely affect the thermosensitive color former layer.
Provides non-separable label base paper. A heat-activatable adhesive layer 20 is formed on the main surface of the label base material 12 by a heat-activatable adhesive mixed with a heat absorbing material , and a thermosensitive coloring agent layer is formed on the main surface on the opposite side of the label base material 12. 1
8 is a non-separable label base paper 10 on which 8 is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-separable label base paper which does not have a release paper and which is heated and melted by a heat-activatable adhesive layer to be stuck on the surface of an adherend.

[0002]

2. Description of the Related Art A conventional non-separable label sticking apparatus forms a predetermined label shape by cutting all parts of a normal label base paper across its both ends in the width direction and forming it on its back surface. The heat-activatable adhesive layer thus prepared is melted by heating and attached to the surface of the article to be attached.

[0003]

When the conventional non-separable label is stuck by the sticking device, the label base paper to be the label is heated, so that the thermosensitive color developing agent layer formed on the surface thereof is adversely affected.

Therefore, a main object of the present invention is to provide a non-separable label base paper which does not adversely affect the thermosensitive color developing agent layer even if the heat-activatable adhesive layer formed on the label base paper is heated. Is.

[0005]

According to the present invention, a heat-activatable adhesive layer is formed on a main surface of a label base material by a heat-activatable adhesive agent in which black carbon is mixed, and a main surface on the opposite side of the label base material is formed. It is a non-separable label base paper on which a thermosensitive color former layer is formed.

[0006]

When the label base material is heated, the heat absorbing layer formed on the main surface of the label base material opposite to the heat-sensitive color developing agent layer absorbs the light rays of the heat-activatable adhesive layer, for example, when it is heated by a strobe. .

The heat-activatable adhesive layer is heated to activate the heat-activatable adhesive layer, and the heat-activatable adhesive layer is attached to an object to be attached.

[0008]

According to the present invention, the label base paper has the thermosensitive color developing agent layer formed on one main surface thereof and the heat absorbing layer formed on the other main surface thereof. When the heat-activatable adhesive layer is heated, for example, it can absorb a light ray when it is heated by a strobe to improve the heat efficiency, and the heat-sensitive color developing agent layer does not unnecessarily develop color.

The above-mentioned objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of the embodiments with reference to the drawings.

[0010]

1 is a perspective view showing a non-separable label base paper as an embodiment of the present invention, FIG. 2 is a sectional view of the embodiment shown in FIG. 1, and FIG. 3 is a view of the embodiment shown in FIG. It is a top view explaining the state which formed the cutting part in the label part of label raw paper.

As shown in FIG. 1, the label base paper 10 has a band-shaped label base material 12 made of paper or the like, on which the lines corresponding to the shape of the label are printed, and the label base material 12 is printed. An image corresponding to the label is printed on the surface of the label, and is cut only partially in the flow direction at the time of printing so as not to come into contact with the both side ends of the label base material 12 by the blade type processing such as a straight line or a curved line. And 14b are formed, and the partial cut portions 14a and 14b form a shape similar to the shape of the label 16.

A thermosensitive color former layer 18 is formed on one main surface of the label base material 12 to develop a color by heating.
The heat-sensitive color former layer 18 is formed by applying, for example, a mixture of a color former, a color former and a binder onto the surface of the label substrate 12 and drying.

In this case, as the color former, for example,
3,3-bis (p-dimethylaminophenyl) -6-dimethylaminophthalide, 3,3-bis (p-dimethylaminophenyl) phthalide, 3- (p-dimethylaminophenyl) -3- (1,2) -Dimethylindol-3-yl) phthalide, 3- (p-dimethylaminophenyl)-
3- (2-methylindol-3-yl) phthalide,
3,3-bis (1,2-dimethylindol-3-yl) -5-dimethylaminophthalide, 3,3-bis (1,2-dimethylindol-3-yl) -6-dimethylaminophthalide, 3,3-bis (9-ethylcarbazol-3-yl) -6-dimethylaminophthalide,
3,3-bis (2-phenylindol-3-yl)-
6-Dimethylaminophthalide, 3-p-dimethylaminophenyl-3- (1-methylpyrrol-3-yl) -6
-Triallylmethane dyes such as dimethylaminophthalide, 4,4'-bis-dimethylaminobenzhydrylbenzyl ether, N-halophenyl-leukoauramine, N-2,4,5-trichlorophenylleucoaamine, etc. Diphenylmethane dyes, benzoyl leuco methylene blue, p-nitrobenzoyl leuco methylene blue and other thiazine dyes, 3-methyl-spiro-dinaphthobilan, 3-ethyl-spiro-dinaphthobilan,
3-phenyl-spiro-dinaphthobilan, 3-benzyl-spiro-dinaphthobilan, 3-methyl-naphtho (6 '
-Methoxybenzo) spirobilan, spiro dyes such as 3-propyl-spiro-dibenzobilane, rhodamine-
Lactam dyes such as β-anilinolactam, rhodamine (p-nitroanilino) lactam and rhodamine (o-chloroanilino) lactam, 3-dimethylamino-7-
Methoxyfluorane, 3-diethylamino-6-methoxyfluorane, 3-diethylamino-7-methoxyfluorane, 3-diethylamino-7-chlorofluorane,
3-diethylamino-6-methyl-7-chlorofluorane, 3-diethylamino-6,7-dimethylfluorane, 3- (N-ethyl-p-toluidino) -7-methylfluorane, 3-diethylamino-7- N-acetyl-
N-methylaminofluorane, 3-diethylamino-7
-N-methylaminofluorane, 3-diethylamino-
7-dibenzylaminofluorane, 3-diethylamino-7-N-methyl-N-benzylaminofluorane, 3
-Diethylamino-7-N-chloroethyl-N-methylaminofluorane, 3-diethylamino-7-N-diethylaminofluorane, 3- (N-ethyl-p-toluidino) -6-methyl-7-phenylaminofluorane ,
3- (N-ethyl-p-toluidino) -6-methyl-7
-(P-toluidino) fluorane, 3-diethylamino-6-methyl-7-phenylaminofluorane, 3-diethylamino-7- (2-carbomethoxy-phenylamino) fluorane, 3- (N-ethyl-N-iso) -Amylamino) -6-methyl-7-phenylaminofluorane, 3- (N-cyclohexyl-N-methylamino)
-6-Methyl-7-phenylaminofluorane, 3-pyrrolidino-6-methyl-7-phenylaminofluorane, 3-piperidino-6-methyl-7-phenylaminofluorane, 3-diethylamino-6-methyl- 7-Xylidinofluorane, 3-diethylamino-7- (o-
Chlorophenylamino) fluorane, 3-dibutylamino-7- (o-chlorophenylamino) fluorane, 3
Examples thereof include fluorane dyes such as -pyrrolidino-6-methyl-7-p-butylphenylaminofluorane.

Examples of colorants include inorganic clay substances such as activated clay, acid clay, attabulgite, bentonite, colloidal silica and aluminum silicate, 4-tert-butylphenol, 4-hydroxydiphenoxide, α-naphthol. , Β-naphthol, 4
-Hydroxyacetophenol, 4-tert-octylcatechol, 2,2'-dihydroxydiphenol,
2,2'-methylenebis (4-methyl-6-tert-
Isobutylphenol), 4,4'-isopropylidenebis (2-tert-butylphenol), 4,4'-
sec-butylidene diphenol, 4-phenylphenol, 4,4'-isopropylidene diphenol (bisphenol A), 2,2'-methylenebis (4-chlorophenol), hydroquinone, 4,4'-cyclohexylidene diphenol, Benzyl 4-hydroxybenzoate, dimethyl 4-hydroxyphthalate, hydroquinone monobenzyl ether, novolac type phenol resin, phenolic compounds such as phenol polymer, benzoic acid,
p-tert-butylbenzoic acid, trichlorobenzoic acid,
Terephthalic acid, 3-sec-butyl-4-hydroxybenzoic acid, 3-cyclohexyl-4-hydroxybenzoic acid, 3,5-dimethyl-4-hydroxybenzoic acid, salicylic acid, 3-isopropylsalicylic acid, 3-tert-
Butyl salicylic acid, 3-benzyl salicylic acid, 3- (α
-Methylbenzyl) salicylic acid, 3-chloro-5- (α
-Methylbenzyl) salicylic acid, 3,5-di-tert
-Butylsalicylic acid, 3-phenyl-5- (α, α-dimethylbenzyl) salicylic acid, aromatic carboxylic acids such as 3,5-di-α-methylbenzylsalicylic acid, and these phenolic compounds, aromatic carboxylic acids and Examples thereof include organic acidic substances such as salts with polyvalent metals such as zinc, magnesium, aluminum, calcium, titanium, manganese, tin and nickel.

Further, examples of the binder include polyvinyl alcohol, methyl cellulose, methoxy cellulose, hydroxyethyl cellulose, carboxymethyl cellulose, modified starch, polyvinyl pyrrolidone, acrylic acid ester, polyacrylamide and the like.

Further, on the back surface of the label substrate 12, for example, a water-dispersible carbon black is mixed with an emulsion, and further mixed with, for example, a heat-activatable adhesive to coat the heat-activatable adhesive layer 20. Are formed.

The partial cut portions 14a and 14b formed on the label base material 12 are preliminarily formed so as to reach the back surface from the front surface of the label base material 12 by, for example, a die roll corresponding to the upper and lower edges of the label 16. It is formed by subjecting the blade to a blade shape process. Since this preliminary blade cutting is formed only in the flow direction of the label base material 12 at the time of printing,
The strength of the paper forming the label substrate 12 does not decrease.

Further, in this embodiment, the label substrate 1
Since both side edges are formed in parallel with the paper-making direction of the paper which constitutes 2, the cutting length of the cutting blade is shortened when the label substrate 12 is cut by the label cutting device as described later, and Since it is unidirectional with respect to the paper-making direction of the paper, the cutting efficiency can be improved and the sharpness of the cutting blade can be kept long and good.

The hot-melt adhesive for forming the heat-activatable adhesive layer 20 formed on the back surface of the label substrate 12 has, for example, a delayed tack property, and is basically a polymer and a solid. It is composed of a plasticizer, preferably contains a tackifier, and may further contain an antioxidant and other additives.

Examples of polymers are polyvinyl acetate, polybutyl methacrylate, vinyl chloride-vinylidene chloride copolymer, synthetic rubber, vinyl acetate-2-ethylhexyl allylate acrylate, vinyl acetate-ethylene copolymer, vinylpyrrolidone-styrene copolymer. , Styrene-butadiene copolymer, vinylpyrrolidone-ethyl acrylate copolymer, etc. can be selected.

Solid plasticizers include crystallized plasticizers and amorphous plasticizers. The crystallized solid plasticizer is not tacky. On the other hand, the amorphous solid plasticizer has tackiness.

Examples of such solid plasticizers include dicyclohexyl ortho-phthalate, diphenyl ortho-phthalate, dihexyl ortho-phthalate, dihydroabietyl ortho-phthalate, dimethyl isophthalate, stellulose benzoate, ethylene glycol dibenzoate, Trimethylolethane tribenzoate, triglyceride tribenzoate, pentaerythritol tetrabenzoate, stellulose octaacetate, tricyclohexyl citrate, N-cyclohexyl-p-toluenesulfonamide, dehydroabietylamine carbonate, methoxyethyl-urea stearate. There is a complex.

Examples of the tackifier include indene resin, ethyl cellulose, petroleum resin (hydrocarbon resin), terpene resin, rosin derivative (polymerized rosin, hydrogenated rosin, pentaerythritol ester of rosin, resin acid dimer).

Next, a label sticking apparatus for molding and sticking to an object to be stuck using the label base paper 10 which is one embodiment of the present invention will be described with reference to FIGS. 5 to 9.

The label applying device 30 includes a label supplying device 32 for supplying a label. This label feeder 3
2 includes a winding reel 34, a label detector 36, a label feeding roller 38, and a winding roll 40. Then, the label base paper 10 is rotatably held on the winding reel 34, and the label base paper 10 passes through the label detector 36 via the label feed roller 38 and is then wound by the winding roll 40. A label forming device 42 for forming a label is provided.

The winding reel 34 is composed of a motor, a gear connected to the motor, a shaft, and a reel which is fixed to the shaft and rotatably holds the label base paper 10 for correcting the deflection of the label base paper 10 being transferred. In addition, the label base paper 10 is pulled with a very weak force in the direction opposite to the transport direction of the label base paper 10.

The label detector 36 is composed of a photoelectric element or the like, and the photoelectric element is installed so as to sandwich the label base paper 10 to detect the pitch of the label base paper 10.

The label forming apparatus 42 includes a die roll 44 for cutting the partial cut portions 14a and 14b of the label base paper 10 so as to be continuous and a die roll 44 for the label base paper 10.
Includes a pressure drum 46 that is urged to be pressed toward and is rotatably fixed. The blade mold formed on the die roll 44 causes the left and right ends of the partial cutting portions 14a and 14b formed on the label base paper 10 to move. The label substrate 12 is formed so as to be partially cut from the front surface to the back surface of the label base material 12.

As shown in FIGS. 3 and 4, the label forming apparatus 42 cuts the partial cutting portions 14a and 14b and the die roll 44.
The label base material 12 is punched out by 8a and 48b, and a predetermined label 16 shape is obtained.

The portion other than the label 16 of the label base paper 10 punched out by the label forming device 42, that is, the scrap portion, is wound around the winding roll 40 as it is, but only the relatively hard label 16 is unwound forward as it is. And is formed so as to reach the label sticking device 50.

The label sticking device 50, which heats the label 16 supplied from the label supply device 32 to activate the heat-activatable adhesive layer 20 and sticks it to the adherend A, is a heat-activatable sticking of the label 16. Heating device 5 for heating agent layer 20
2 and a sticking means 54 for sticking the label 16 to the adherend A with the adhesive force of the activated heat-activatable adhesive layer 20.

The label sticking device 50 has a transfer device 56 for transferring the label 16 between the heating device 52 and the sticking device 54.
The transfer device 56 includes a driving roller 58 connected to a motor (not shown) and is rotatably formed by the motor. The label applying device 50 has a roller 6 at the other end.
0 is formed, and another roller 62 is rotatably mounted between them, and a plurality of adsorption belts 64 made of stainless steel belts are provided at predetermined intervals between these rollers 58, 60 and 62. It has been suspended.

Therefore, when the drive roller 58 is rotated, the rollers 60 and 62 rotate together with the suction belt 64, and the suction belt 64 transfers the label 16 in accordance with the speed at which the adherend A is sent. It is set to an appropriate speed so that

The suction belt 64 is covered with a suction cover 66, and a suction fan 68 attached to the upper portion of the suction cover 66 generates a suction force between the suction belts 64. .

Below the suction belt 64, between the drive roller 58 and the roller 62, there is a predetermined distance from the suction belt 64, for example, 70 ° C. to 80 ° C.
A heating device 52 is provided which heats the heat-activatable adhesive layer 20 by heat of ° C, and which is equipped with, for example, a xenon flash lamp.

By the heating of the heating device 52, the heat-activatable adhesive layer 20 of the label 16 sent while being adsorbed on the surface of the adsorption belt 64 is heated and activated.

Further, the adherend A of the label sticking device 50
A suction box 70 is provided above the portion to be attached to
The suction box 70 is made of a substance through which gas is difficult to pass, like the suction cover 66 described above, and the air inside the suction box 70 is made negative by the suction fan 68 so that the suction force of the suction belt 64 can be increased. Has been formed.

That is, even at the portion where the label 16 is attached to the adherend A, negative pressure is applied near the suction belt 64, and the label 16 is formed so as to be sucked and held. Is formed with a sticking device 54 for sticking the label 16 toward the adherend A.

As shown in FIG. 7, this sticking device 54 includes a pressing device 72 as a pressing means, and the pressing device 72
Includes a pressing rod 74 made of a cylindrical metal rod, and is vertically provided inside the suction box 70.

An elastic body 76 made of a coil-shaped spring is provided around the outer peripheral surface of the pressing rod 74 constituting the pressing device 72. The elastic body 76 has one end fixed to the upper end of the pressing rod 74 and is pressed. A hollow cylindrical label pressing portion 78 made of a flexible material such as soft plastic is formed at the lower end of the rod 74.

An pushing device 80 is formed along the pushing rod 74 as a pushing means for pushing the pushing rod 74 of the pushing device 72 toward the adherend A in the vertical direction.

In the pushing device 80, an actuator 82 composed of a cylinder such as hydraulic pressure or air is vertically installed vertically, and a pushing rod 74 of a pushing device 72 is slid on a tip of a rod 84 which is an operating body of the actuator 82. A holding portion 86, which is a holding means including a bearing having a bearing and the like, which holds the bearing freely, is formed. The bearing portion 86 of the holding portion 86 is formed.
The middle part of the pressing rod 74 is held at a. The lower end of the elastic body 76 is fixed to the upper end of the holding portion 86.

In the lower part of the pushing device 80, a stopper portion 90 as a stopping means is formed at a position near the lowermost end of the stroke of the actuator 82 so as to suddenly stop the advancing operation of the rod 84 of the actuator 82.

In the stopper portion 90, a stopper piece 94 made of sponge or the like which is a buffer is attached to the upper surface of the L-shaped fixing material 92 with a double-sided tape, and the stopper portion 94 is a surface contacting with the tip of the rod 84 of the pushing device 80. The fixing member 92 is fixed to an appropriate position of the suction box 70 so that the piece 94 is located.

On the peripheral surface of the pushing rod 74, the pushing device 80 is located near the uppermost end of the stroke of the actuator 82 of the pushing device 80 and between the lower end of the elastic body 76 and the upper end of the label pushing portion 78. A ring-shaped cushioning body 100 made of an elastic material such as sponge is provided around a portion of the holding portion 86 that contacts the lower surface.

That is, on the upper surface of the annular mounting piece 102,
A cushioning material 104 such as a sponge is attached, and the cushioning body 100 is attached by fixing the annular mounting piece 102 to the peripheral surface of the pressing rod 74. Therefore, the elastic body 76
Even if the pressing rod 74 is pulled back by the action of, the shock absorbing force is absorbed by the buffer body 100, and it is possible to endure long-term use.

As shown in FIGS. 8 and 9, the label pressing portion 78 is made of a soft material such as soft plastic, and has a hollow cylindrical main body 110 having a hollow portion 112 in its body.
In order to prevent the axis 110a of the cylindrical main body 110 from forming a plane parallel to the surface of the label 16, the cylindrical main body 110 is attached to the pressing rod 74 which is the pressing body of the label 16 so as to be substantially orthogonal in this embodiment. And holes 114.

A buffer groove 1 is formed on the peripheral surface of the cylindrical main body 110.
16 is formed, and the pressing portion 1 is provided at the lower end of the tubular main body 110.
18 is formed.

The pressing portion 118 is formed in a brim shape as a whole having a hakama shape that gradually opens to the outside and a tip thereof formed in a substantially sharp shape.

Mounting hole 114 as a mounting portion for the pressing device 72
Is a through hole formed in the upper part of the tubular body 110, and the lower end of the pressing rod 74 of the pressing device 72 is fitted into the mounting hole 114, and the tubular body 110 is relatively strong due to its elasticity. The label pressing portion 78 is formed so as to be attached to the pressing rod 74.

In this embodiment, the lower end portion of the pressing rod 74 is provided with a mounting groove 120 around it, and a mounting head 122 is formed in the lower portion of the mounting groove 120 so that the cylindrical main body 110 is pressed by the pressing rod 74. It is formed so as to be relatively firmly attached to 74.

Next, the operating conditions of this embodiment will be described. First, as shown in FIGS. 5 and 6, the label base paper 1
The roll 0 is attached to the winding reel 34, the label base paper 10 is passed through the label feeding roller 38 of the label supply device 32, the label detector 36 and the label forming device 42, and the label base paper 10 is partially cut. 14a and 1
The label 16 is formed by cutting so that the left and right ends of 4b are connected to each other.

The label 16 is the label forming device 4
The label 16 that is fed forward from 2 is fed out,
Due to the negative pressure generated by the action of the suction fan 68, the suction belt 68 is suction-held on the lower surface of the suction belt 64.

Next, the heating device 52 operates to heat and activate the heat-activatable adhesive layer 20 on the back surface of the label 16 to generate adhesive force, which is suction-held on the surface of the rotating suction belt 64. It can be moved to the position where it can be attached to the adherend A as it is.

Next, the extrusion device 80 operates and the extrusion device 8 is operated.
When the rod 84 of the actuator 82 of No. 0 rapidly descends, the lower surface of the holding portion 86 causes the buffer body 10 to move.
When 0 is pressed, the pressing rod 74 of the pressing device 72 is rapidly lowered in parallel with the lowering movement of the rod 84 via the buffer body 100.

Then, the rod 84 of the actuator 82
Stopper portion 90 provided near the lowermost end of the stroke
Then, the lowermost surface of the holding portion 86 hits, and the descending movement of the rod 84 suddenly stops.

On the other hand, the pushing device 80 for holding the pressing rod 74.
Of the pressing rod 74 lowered in parallel with the downward movement of the holding portion 86 of the
Is further lowered as it is against the elastic body 76 by the inertial force of the pressing rod 74 to push the label 16 suction-held on the lower surface of the suction belt 64, and the heat-activatable adhesive layer 20 of the label 16 is pushed. The surface of is in contact with the upper surface of the adherend A conveyed by the conveying device 110 and is adhered to the adherend A.

At this time, since the label pressing portion 78 made of a flexible material is formed in the lower part of the pressing rod 74, the label pressing portion 78 absorbs the impact due to the downward movement of the pressing rod 74, and the label pressing portion 78 absorbs the shock. The descending motion does not press and crush the adherend A.

In this embodiment, two pressing devices 72 are formed side by side, as shown in FIG.
Each of them is configured so that the pressing rod 64 descends independently.

Therefore, even if the surface of the adherend A has an uneven surface or a step, the pressing rods 74 of the pressing devices 72 accurately reach the surface of the adherend A and are dense. The label 16 can be attached to the surface of the adherend A.

[Brief description of drawings]

FIG. 1 is a perspective view showing a non-separable label base paper as an embodiment of the present invention.

FIG. 2 is a sectional view of the embodiment shown in FIG.

FIG. 3 is a plan view illustrating a state in which a cutting portion is formed in the label portion of the label raw paper of the embodiment shown in FIG.

FIG. 4 is a plan view showing a label molded by the embodiment shown in FIG.

5 is a perspective view showing a label sticking device for forming and sticking the non-separable label of the embodiment shown in FIG. 1. FIG.

FIG. 6 is a front view in which a part of the example shown in FIG.

FIG. 7 is a cross-sectional view showing the main parts of the sticking apparatus of the example shown in FIG.

FIG. 8 is a partially cutaway front view showing an example of a label pressing portion.

9 is a cross-sectional view taken along the line VIII-VIII in FIG.

[Explanation of symbols]

 10 Label Base Paper 12 Label Substrate 14a, 14b Partial Cut Section 16 Label 18 Thermosensitive Coloring Agent Layer 20 Thermally Activated Adhesive Layer 30 Labeling Device 32 Label Supply Device 34 Winding Reel 36 Label Detector 38 Label Feed Roller 40 Winding Roll 42 label forming device 44 die roll 46 impression cylinder 48a, 48b cutting part 50 label sticking device 52 heating device 54 sticking device 56 transfer device 58 drive roller 60, 62 roller 64 suction belt 66 suction cover 68 suction fan 70 suction box 72 pressing device 74 Pressing bar 76 Elastic body 78 Label pressing part 80 Extrusion device 82 Actuator 84 Rod 86 Holding part 90 Stopper part 92 Fixing material 94 Stopper piece 100 Buffer body 102 Circular mounting piece 104 Buffer material 110 Hollow tubular body 110a Line 112 the hollow portion 114 mounting hole 116 buffer groove 118 pressing portion 120 mounting groove 122 for mounting the head 124 conveying device

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[Procedure amendment]

[Submission date] April 13, 1993

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0005

[Correction method] Change

[Correction content]

[0005]

According to the present invention, a heat-activatable adhesive layer is formed on a main surface of a label base material with a heat-activatable adhesive material mixed with a heat absorbing material , and the opposite side of the label base material is formed. It is a non-separable label base paper having a thermosensitive color developing agent layer formed on its main surface.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location D21H 19/80 27/00 G09F 3/00 F 7323-5G 3/10 C 7323-5G

Claims (3)

[Claims] 1. A heat-activatable adhesive layer is formed on the main surface of a label substrate with a heat-activatable adhesive mixed with black carbon, and a heat-sensitive color former layer is formed on the opposite main surface of the label substrate. Non-separable label base paper. 2. The non-separable label base paper according to claim 1, wherein the black carbon forming the heat-activatable adhesive layer is water-dispersible type carbon mixed with an emulsion. 3. The non-separable label base paper according to claim 1, wherein the heat-activatable adhesive layer is coated with a delayed tack adhesive.