JP5644233B2 - Manhole cover curing label - Google Patents

Description

  The present invention relates to a label used for curing a manhole cover during asphalt paving.

  When paving the road where the manhole is installed with asphalt, a label is affixed on the lid of the manhole, and curing is performed so that asphalt powder and earth and sand do not enter the recess on the lid surface. ing. Conventionally, a protective cover (Patent Document 1) in which a pressure-sensitive adhesive layer is provided on one side of a synthetic rubber sheet has been used as a label used in such applications.

JP 2001-11880 A

However, the protective cover described in Patent Document 1 is originally intended to prevent slipping of a vehicle passing over the protective cover, and uses a synthetic rubber sheet, which is not inexpensive. In addition, when used for curing at asphalt pavement, a high temperature asphalt of about 160 ° C. is placed, so that it is useless once. Therefore, a low-cost curing label is required.
Further, since the label for curing is peeled off after the completion of the construction, it is also required that the releasability is good, for example, the base material of the label is not torn at the time of peeling, and no adhesive remains on the manhole cover surface.
The present invention has been made in view of the above circumstances, and an object thereof is to provide a manhole cover curing label that is inexpensive and has good removability.

The present invention for solving the above problems has the following aspects.
[1] A label used for curing a manhole cover during asphalt pavement,
Kraft paper and a label body having an adhesive layer laminated on one side of the kraft paper, and a release sheet laminated on the surface of the label body on the adhesive layer side ,
The pressure-sensitive adhesive layer, conforming to JIS Z-0237 (2000 years), versus stainless steel plate adhesion as measured under conditions of 23 ° C. is, 100-200 N / m der Ru manhole cover curing label.
[2] The manhole cover curing label according to [1], wherein the pressure-sensitive adhesive layer has a thickness of 15 to 30 g / m ² as a dry coating amount .
[3] The label for curing a manhole cover according to [1] or [2], wherein the kraft paper is a stretched paper that has been subjected to kulpack processing.
[4] The manhole cover curing label according to any one of [1] to [3], wherein the basis weight of the craft paper is 60 to 110 g / m ² .
[5] The manhole cover curing label according to any one of [1] to [4], wherein a waterproof film is laminated on the surface of the label body on the kraft paper side.
[6] The manhole cover curing label according to [5], wherein a corona discharge treatment is applied to a surface of the waterproof film opposite to the craft paper side.

  According to the present invention, it is possible to provide a manhole cover curing label that is inexpensive and has good removability.

It is a schematic sectional drawing (Drawing 1 (a)) and a top view (Drawing 1 (b)) of a label for manhole cover curing concerning one embodiment of the present invention.

Hereinafter, an embodiment is shown and the manhole cover curing label of this invention is demonstrated.
FIG. 1 shows a manhole cover curing label (hereinafter simply referred to as a label) 10 according to a first embodiment of the present invention. FIG. 1A is a schematic sectional view of the label 10, and FIG. 1B is a top view thereof.
The label 10 includes a kraft paper 1 and a label body 11 having an adhesive layer 2 laminated on one side of the kraft paper 1, and a release sheet 12 laminated on the surface of the label body 11 on the adhesive layer 2 side. .
A waterproof film 3 is laminated on the surface of the label body 11 on the kraft paper 1 side. Although the waterproof film 3 is not always essential, the waterproof film 3 improves the water resistance of the label 10 and damages the kraft paper 1 due to rain or the like after being attached to the manhole cover and before asphalt is placed. It is possible to prevent the peeling from the manhole cover.
The label 10 is formed with a circular half-cut portion 13 having substantially the same size as the manhole cover to be cured, with a depth reaching the inside of the release sheet 12 from the surface on the waterproof film 3 side. Thereby, at the time of use, the circular label main body 11 inside the half cut part 13 can be peeled from the release sheet 12, and can be stuck on the upper surface of the manhole cover.

[Label body 11]
The kraft paper 1 is a paper whose main component is pulp (craft pulp) manufactured by the kraft method.
The kraft paper 1 may contain various additives in addition to kraft pulp. Examples of the additive include a wet paper strength agent.

The craft paper 1 may be flat, but is preferably stretched paper that has been subjected to kurpack processing or the like. By using stretched paper (craft stretched paper) as the kraft paper 1, when the label 10 is affixed to the manhole cover surface, the label 10 is easily deformed along the irregularities on the manhole cover surface. The adhesiveness of is improved.
For example, kulpack processing is processing that causes paper to shrink finely on a paper machine, and by applying the processing in a predetermined direction (for example, the length direction), the paper has a stretching property in the predetermined direction. Become. In Kurupak processing, a device that rotates an endless thick rubber belt by pressure is usually attached to a part of a paper machine dryer roll via a nip roll, and the wet paper is placed between the dryer roll and the previously stretched rubber belt. And the paper is shrunk using the shrinkage of the rubber belt.
As the kraft stretch paper, craft paper type 5 No. 1 described in JIS P 3401 (2000) is preferable.

The thickness of the kraft paper 1 is preferably 60 to 110 g / m ^{2 and} more preferably 70 to 80 g / m ² as the basis weight. When the basis weight is equal to or more than the lower limit of the above range, the kraft paper 1 is not easily broken at the time of peeling from the manhole cover, and re-peelability is improved. Exceeding the upper limit leads to increased costs.

The kraft paper 1 may be further impregnated or coated with a resin. Thereby, the water resistance of the label main body 11 further improves.
Examples of the resin impregnated or applied to the kraft paper 1 include polyvinyl alcohol (PVA), styrene butadiene rubber (SBR), starch, and acrylic resin.
The impregnation or application of the resin to the kraft paper 1 is a method in which the resin is dissolved or dispersed in water, a solvent or the like to prepare a resin liquid, which is applied to the kraft paper 1 and dried. A method of taking out kraft paper 1 and then taking it out and drying it may be mentioned.

The pressure-sensitive adhesive layer 2 is a layer for sticking the kraft paper 1 to the manhole cover.
The pressure-sensitive adhesive layer 2 is preferably 40 to 300 N / m, and has an adhesive strength to a stainless steel plate of 40 to 300 N / m, measured under a condition of 23 ° C. in accordance with JIS JIS Z-0237 (2000). / M is more preferable, and 150 to 200 N / m is more preferable. When the adhesive strength is at least the lower limit within the above range, the adhesiveness to the manhole cover is good. Moreover, when it is below the upper limit value, the removability is good, and the kraft paper 1 is not easily broken at the time of peeling, and the adhesive layer 2 remains (glue residue) on the manhole cover after peeling.
The pressure-sensitive adhesive force can be adjusted by the type of pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 2, the amount of the crosslinking agent blended in the pressure-sensitive adhesive, the thickness of the pressure-sensitive adhesive layer 2, and the like.

As an adhesive which comprises the adhesive layer 2, arbitrary adhesives, such as a natural rubber adhesive, a synthetic rubber adhesive, an acrylic adhesive, a urethane adhesive, a silicone adhesive, can be used, for example. Examples of the dosage form of the pressure-sensitive adhesive include a solvent type, an emulsion type, a solventless type, and a hot melt type, and any dosage form may be used.
If necessary, other auxiliary agents may be added to the pressure-sensitive adhesive. Examples of the other auxiliary agents include thickeners, pH adjusters, tackifiers, cross-linking agents, adhesive particles, antifoaming agents, antiseptic / antifungal agents, pigments, inorganic fillers, stabilizers, wetting agents, wetting agents. Etc.
In the present invention, among the above, acrylic pressure-sensitive adhesives are preferable from the viewpoint of durability, economy, and the like, and acrylic pressure-sensitive adhesives in which a crosslinking agent is blended are particularly preferable.

The thickness of the pressure-sensitive adhesive layer 2 is preferably 10 to 50 g / m ² , more preferably 15 to 30 g / m ² , and still more preferably 18 to 22 g / m ² as a dry coating amount. When the dry coating amount is not less than the lower limit of the above range, the adhesion to the manhole cover is improved, and when it is not more than the upper limit, the removability is improved.

The waterproof film 3 is not particularly limited as long as it is a film that does not transmit water and can be laminated to the kraft paper 1. For example, any one selected from polyethylene, polypropylene, polyethylene terephthalate, polyvinyl chloride, polyurethane, and the like. Examples thereof include a film composed of one kind or a mixture of two or more kinds, and a multilayer film obtained by laminating two or more of these films. Among these, a polyethylene film is preferable in terms of economy.
10-30 micrometers is preferable and, as for the thickness of the waterproof film 3, 13-20 micrometers is more preferable. When the thickness is not less than the lower limit of the above range, the effect of imparting water resistance is sufficiently obtained, and when it is not more than the upper limit, the economy is improved.
The waterproof film 3 is sufficient if it can prevent rain until asphalt is placed, and it may not be possible to prevent rain after asphalt paving. Further, the strength of the label body 11 itself is maintained by the kraft paper 1. Therefore, the waterproof film 3 may not have resistance to heat during asphalt pavement.

A printed layer may be formed on the upper surface of the label main body 11, that is, the surface on the waterproof film 3 side, in order to display a product name, a manhole size, an application (for example, “for OO”) and the like. Therefore, it is preferable that the surface of the waterproof film 3 opposite to the kraft paper 1 side is subjected to corona discharge treatment. Thereby, the wettability of a process surface increases and printability improves.
The corona discharge treatment is preferably performed so that the wetting index of the treated surface measured according to JIS K6768 is 38 dyne / cm or more, more preferably 40 dyne / cm or more. The greater the wetting index, the higher the affinity for ink and the better the printability.
The corona discharge treatment can be performed using a known corona discharge treatment apparatus.

[Peeling sheet 12]
The release sheet 12 is not particularly limited, and a known release sheet used for a label or the like can be used. For example, what has the base material for release sheets and the release agent layer provided in the adhesive layer 2 side of the base material for release sheets is mentioned.
Examples of the release sheet substrate include papers such as high-quality paper and glassine paper; plastic films such as polyethylene terephthalate film and polypropylene film; and the like.
Examples of the release agent constituting the release agent layer include addition type or condensation type silicone release agents, long-chain alkyl group-containing compounds, and the like.

[Manufacturing Method of Label 10]
Although the manufacturing method of the label 10 is not particularly limited, for example, the step of laminating the waterproof film 3 on one side of the kraft paper 1 and the side of the kraft paper 1 opposite to the side on which the waterproof film 3 is laminated are adhered. The label 10 can be manufactured by sequentially performing the step of laminating the release sheet 12 via the agent layer 2 and the step of forming the half cut portion 13 from the waterproof film 3 side.
As a method of laminating the release sheet 12 on the kraft paper 1 via the pressure-sensitive adhesive layer 2, for example, the pressure-sensitive adhesive layer forming coating liquid containing the pressure-sensitive adhesive is applied to the release sheet 12 and dried. After the layer 2 is formed, the adhesive layer 2 is attached to the surface of the kraft paper 1 opposite to the side on which the waterproof film 3 is laminated (transfer method). A method of applying the pressure-sensitive adhesive layer-forming coating solution on the surface opposite to the side on which the film is laminated, drying to form the pressure-sensitive adhesive layer 2, and attaching the release sheet 12 to the pressure-sensitive adhesive layer 2 (Direct coating method). Among these, the transfer method is preferable because it does not damage the base material (craft paper).
The coating of the coating solution for forming the adhesive layer can be carried out using a known coating apparatus, and examples of the coating apparatus include a knife coater, a micro bar coater, an air knife coater, a reverse roll coater, a reverse gravure coater, and a variogravure. Examples include a coater, a die coater, and a curtain coater. As a drying method, for example, hot air drying, infrared drying, vacuum drying, or the like can be applied.
Half cut part 13 can be formed, for example using a cylindrical cutter.

[How to use label 10]
As described above, the label 10 is used by peeling the label body 11 inside the half cut portion 13 from the release sheet 3 and sticking it to the surface of a manhole cover installed on the road. After the label body 11 is attached, asphalt heated to about 160 ° C. is laid, and the road is paved with asphalt by rolling using a road roller of about 1 to 10 t. Thereafter, the label body 11 is peeled off together with the asphalt on the label body 11, and the cured manhole cover is exposed.

As described above, the label 10 is inexpensive because the base material of the label main body 11 is the kraft paper 1. In addition, it has good impact resistance and heat resistance, such as breakage or deformation when the label body 11 is stuck on a manhole cover, deformation or damage due to heat (about 160 ° C.) when asphalt is laid on the label body 11, etc. It is also difficult for problems to occur. Therefore, the removability is also good, and when peeling after asphalt pavement, the label main body 11 is not easily broken, and a part of the pressure-sensitive adhesive layer 2 remains on the manhole cover surface. In addition, because it does not become industrial waste, it is environmentally friendly.
Further, the waterproof film 3 is provided on the upper surface of the kraft paper 1 to improve the water resistance, and it is possible to prevent the label main body 11 from being damaged due to rain or the like after being attached to the manhole cover and before the asphalt is placed. .

In addition, this invention is not limited to the said embodiment.
For example, although an example in which the waterproof film 3 is provided is shown, the waterproof film 3 may not be provided. In this case, the kraft paper 1 may be either one impregnated with resin or one not impregnated, but if one impregnated with resin is used, the same water resistance can be obtained without providing the waterproof film 3. This is preferable because an effect of improving the property is obtained.
Further, a printed layer may be formed on the surface of the waterproof film 3 or the surface of the kraft paper 1. As a method for forming the printing layer, a known printing method such as an offset printing method, a gravure printing method, a screen printing method or the like can be used.
Moreover, although the label 10 was made into a square and the example which peeled one part of the label main body 11 with the circular half cut part 13 was shown, label 10 itself is good also as a circle shape.

EXAMPLES The present invention will be specifically described below with reference to examples and comparative examples, but the present invention is not limited thereto.
[Example 1]
A label having the same configuration as that of the label 10 shown in FIG. 1 was produced by the following procedure.
A polyethylene film was laminated with an extruder on one side of kraft paper ("bleached stretch paper" manufactured by Oji Paper Co., Ltd., basis weight 75 g / m ² ). Hereinafter, this is referred to as PE craft paper.
Next, “acrylic crosslinked type F7F” (manufactured by Toyo Ink Co., Ltd.) is applied to a release sheet (“Direct Silicone Sepa (U8C)” manufactured by Oji Tac Co., Ltd.) at a dry coating amount of 22 g / m ² and dried. Thus, an adhesive layer was formed. The pressure-sensitive adhesive layer was attached to the surface of PE kraft paper opposite to the side on which the polyethylene film was laminated, and then half-cut using a cylindrical cutter from the polyethylene film side to obtain a label.

With respect to the obtained label, the wetting index of the outermost surface (corona discharge treated surface) on the waterproof film side was measured according to JIS K6768, and was 42 dyne / cm.
Moreover, when the circular label main body inside a half cut part was peeled off, when the adhesive strength (23 degreeC) with respect to a stainless steel plate of the adhesive layer of this label main body was measured based on JISZ-0237 (2000) 150 N / m.

[ Reference Example 2]
In Example 1, a label was prepared in the same procedure as in Example 1 except that “acrylic crosslinked type F6M” (manufactured by Toyo Ink Co., Ltd.) was used as the adhesive instead of “acrylic crosslinked type F7F”.
About the obtained label, when the adhesive force (23 degreeC) with respect to a stainless steel plate of the adhesive layer of a label main body was measured like the above, it was 320 N / m.

[Comparative Example 1]
In Example 1, art paper (“Art Coated Paper” manufactured by Oji Paper Co., Ltd., basis weight 157 g / m ² ) was used instead of PE kraft paper, and “acrylic emulsion” (manufactured by Seiden Chemical Co., Ltd.) was used as an adhesive. A label was prepared in the same procedure as in Example 1 except that the same “Direct Silicone Sepa (U8C)” (manufactured by Oji Tac Co.) as in Example 1 was used as the release sheet.
About the obtained label, when the adhesive force (23 degreeC) with respect to a stainless steel plate of the adhesive layer of a label main body was measured like the above, it was 580 N / m.

[Comparative Example 2]
In Example 1, instead of PE kraft paper, synthetic paper (“YUPO (registered trademark) 110” manufactured by YUPO CORPORATION, thickness 110 μm) made of polypropylene (PP) as a main raw material was used. A label was prepared in the same procedure as in Example 1 except that an “adhesive two-component crosslinking type” (manufactured by Seiden Chemical Co., Ltd.) was used and a polyethylene-laminated release paper was used as the release sheet.
About the obtained label, when the adhesive force (23 degreeC) with respect to the stainless steel plate of the adhesive layer of a label main body was measured like the above, it was 500 N / m.

The following evaluation was performed about the label obtained in Example 1 , Reference Example 2, and Comparative Examples 1-2.
<Evaluation of removability after asphalt pavement>
First, a slate asphalt for pavement defined in JIS K 2207 (petroleum asphalt) was prepared as an asphalt mixture.
Next, on the road surface in which a manhole closed with a circular lid with a diameter of 60 cm is installed in the center, the circular label body inside the half-cut portion is peeled from the label obtained in each example on the upper surface of the manhole cover. And stuck. Thereafter, the asphalt composite material having a temperature of 160 ° C. was laid on the road surface, and rolling was performed using a 1 t road roller.
30 minutes after laying the asphalt mixture, the label body stuck on the manhole cover was peeled off, and the state of tearing of the label body and the state of adhesive residue were observed, and the removability was evaluated according to the following evaluation criteria. .
(Evaluation criteria)
○: No tearing of the label body or adhesive residue on the manhole cover surface was observed.
Δ: The label body was torn or some adhesive residue was left on the manhole cover surface, but it was within the allowable range.
X: The label main body was broken or the adhesive residue on the manhole cover surface was remarkable.

As shown in the above results, the labels of Example 1 and Reference Example 2 had good removability from the manhole cover after asphalt paving.
On the other hand, although the same paper base was used, the label of Comparative Example 1 based on art paper had the label body broken when peeled after asphalt paving, and the adhesive residue was also remarkable. Further, the label of Comparative Example 2 based on synthetic paper containing PP as a main raw material was excellent in strength at room temperature, but was punctured during asphalt paving and was greatly torn during peeling.

  DESCRIPTION OF SYMBOLS 1 ... Kraft paper, 2 ... Adhesive layer, 3 ... Waterproof film, 10 ... Label for manhole cover curing, 11 ... Label body, 12 ... Release sheet, 13 ... Half cut part

Claims (6)

A label used to cure the manhole cover during asphalt paving,
Kraft paper and a label body having an adhesive layer laminated on one side of the kraft paper, and a release sheet laminated on the surface of the label body on the adhesive layer side ,
The pressure-sensitive adhesive layer, conforming to JIS Z-0237 (2000 years), versus stainless steel plate adhesion as measured under conditions of 23 ° C. is, 100-200 N / m der Ru manhole cover curing label. The thickness of the pressure-sensitive adhesive layer is 15 to 30 g / m as a dry coating amount. ² The manhole cover curing label according to claim 1, wherein   The manhole cover curing label according to claim 1 or 2, wherein the kraft paper is stretched paper subjected to kurpack processing. The basis weight of the kraft paper is 60~110g / ^{m 2,} the manhole cover curing label according to any one of claims 1-3.   The label for a manhole cover curing according to any one of claims 1 to 4, wherein a waterproof film is laminated on a surface of the label main body on the craft paper side.   The manhole cover curing label according to claim 5, wherein a corona discharge treatment is applied to a surface of the waterproof film opposite to the craft paper side.

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