CN116354184A

CN116354184A - Rolling body

Info

Publication number: CN116354184A
Application number: CN202211636055.2A
Authority: CN
Inventors: 金子知仁
Original assignee: Fujifilm Corp
Current assignee: Fujifilm Corp
Priority date: 2021-12-27
Filing date: 2022-12-14
Publication date: 2023-06-30
Also published as: CN218754271U

Abstract

The invention provides a roll body with excellent damage inhibition and conveying efficiency of microcapsules. A roll body is provided with a core and a long sheet wound around the core, wherein the long sheet is provided with a base sheet, and a spacer and microcapsules located on at least one surface or both surfaces of the base sheet, the spacer is provided along the winding direction of the long sheet, the thickness of the spacer is less than 2.5mm, and the cross-sectional diameter of the roll body is 15cm or less.

Description

Rolling body

Technical Field

The invention relates to a winding drum body.

Background

The pressure measuring material is used for applications such as a bonding process of liquid crystal glass, solder printing on a printed wiring board, and pressure adjustment between rolls. Such a pressure measurement material includes, for example, a measurement sheet represented by Prescale (trade name; registered trademark) supplied from fujifilm corporation. The measurement piece has a feature that the sheet is cut into an arbitrary size according to the measurement site and used. Further, unlike so-called pressure-sensitive copying paper in which a color reaction is caused by a high line pressure based on a pen pressure, a pressure-sensitive sheet has a feature that a surface pressure can be measured.

The surface of the test piece is provided with a color former such as a leuco dye or a diazo compound or microcapsules containing a color former for coloring the color former. The microcapsules are broken by applying a predetermined pressure to the microcapsules, and for example, the color former is discharged to the outside of the microcapsules to cause a color reaction with the color former disposed outside the microcapsules.

In the case where the microcapsules are destroyed before the pressure is measured, the pressure cannot be measured, and thus care must be taken to handle the measurement sheet.

For example, when a pressure measuring sheet is wound around a core to form a roll body, a base sheet provided in the pressure measuring sheet is brought into contact with the microcapsules, and pressure is applied to the microcapsules to cause the microcapsules to be destroyed, or when the microcapsules are broken by an impact during conveyance of the roll body, the microcapsules may be destroyed.

In patent document 1, in order to suppress the destruction of the microcapsules, a pressure measuring sheet is proposed, which is a pressure measuring material that uses a color reaction between a color former and a color former, and includes: a base; a color former layer containing microcapsules containing a color former and disposed on the substrate; and a spacer provided at an edge portion of the base body.

Patent document 1: international publication No. 2021/171867

Disclosure of Invention

However, there is a demand for downsizing of a roll body in which a test piece or the like is wound around a core from the viewpoint of conveyance efficiency. An object of an embodiment of the present invention is to provide a roll body excellent in microcapsule breakage inhibition and transport efficiency.

The specific means for solving the problems are as follows.

The roll body is provided with a core and a long sheet wound around the core, wherein the long sheet is provided with a base sheet, and a spacer and microcapsules which are positioned on at least one surface or both surfaces of the base sheet, the spacer is arranged along the winding direction of the long sheet, the thickness of the spacer is less than 2.5mm, and the cross-sectional diameter of the roll body is 15cm or less.

<2> the roll body according to the above <1>, wherein,

the spacer comprises a rubber material.

<3> the roll body according to the above <1> or <2>, wherein,

the thickness of the spacer is 0.5mm or more.

<4> the roll body according to any one of the above <1> to <3>, wherein,

the spacer has a Shore hardness of 35HS or more.

<5> the roll body according to any one of the above <1> to <4>, wherein,

the spacers are provided at both ends of the base sheet in a direction orthogonal to the winding direction.

<6> the roll body according to any one of the above <1> to <5>, wherein,

the thickness of the spacer varies by 10% or less in the winding direction.

<7> the roll body according to any one of the above <1> to <6>, wherein,

the long sheet is used for a test piece.

Effects of the invention

According to an embodiment of the present invention, a roll body excellent in the breakage suppression property and the transport efficiency of microcapsules can be provided.

Drawings

Fig. 1 is a perspective view showing an embodiment of the roll body of the present invention.

Fig. 2 is a cross-sectional view taken along line A-A of a long sheet provided in the roll body shown in fig. 1.

Fig. 3 is a sectional view taken along line B-B of the drum body shown in fig. 1.

Symbol description

1-core, 2-long sheet, 3-spacer, 4-flange, 5-substrate sheet, 6-adhesive layer, 7-microcapsule, 10-roll, L-roll cross-sectional diameter, L-core inner diameter, X-winding direction.

Detailed Description

In the present invention, in the numerical ranges indicated by "to" respectively, the numerical values before and after "to" are included as the minimum value and the maximum value.

In the numerical ranges described in stages in the present invention, the upper limit value or the lower limit value described in one numerical range may be replaced with the upper limit value or the lower limit value of the other numerical range described in stages. In the numerical ranges described in the present invention, the upper limit or the lower limit of the numerical range may be replaced with the values shown in the examples.

In the present invention, each component may contain a plurality of corresponding substances.

In the present invention, the term "layer" may include a case where only a part of the region is formed in addition to a case where the region is formed integrally when the region where the layer or film exists is observed.

In the present invention, the long-sized sheet refers to a sheet having a length longer in the longitudinal direction than in the width direction.

In the present invention, the cross-sectional diameter of the roll body means the length of a straight line connecting 2 points on the outer periphery of the long sheet wound around the core and the midpoint of the core.

In the present invention, the rubber material means a compound having rubber elasticity at 25 ℃.

The compound having rubber elasticity is a compound having a larger displacement amount with respect to force than the metal.

The shore hardness of the compound having rubber elasticity is preferably 20HS or more, more preferably 35HS or more, still more preferably 40HS or more, and still more preferably 55HS or more. The upper limit of the shore hardness can be set to 100HS or less.

In the present invention, the Shore hardness is measured according to JIS Z2246 (2000).

In the present invention, the thickness of the spacer or the like is measured as follows.

At 3 positions 15cm, 35cm and 55cm from one end of the spacer or the like in the longitudinal direction, the thickness was measured for every 3 points, an average value of the thicknesses of 9 points in total was calculated, and the value obtained by rounding the 2 nd position of the decimal point of the average value was taken as the thickness.

The thickness variation of the spacer was measured as follows.

The thickness was measured at 3 points from the end of the spacer 15cm, 35cm and 55cm from the longitudinal direction. The difference between the maximum value and the minimum value of the thicknesses of the total 9 points was obtained, divided by the average value of the thicknesses of the total 9 points, multiplied by 100 times, and rounded at the 2 nd position of the decimal point, thereby measuring the deviation of the thickness of the spacer.

The variation in thickness of the spacer means a variation in thickness in the winding direction of the long sheet.

In measuring the thickness, a digital dial thickness gauge was used.

In the present invention, when the embodiments are described with reference to the drawings, the configuration of the embodiments is not limited to the configuration shown in the drawings. The sizes of the components in the drawings are conceptual, and the relative relationship between the sizes of the components is not limited thereto.

[ Rolling body ]

The roll body of the present invention comprises a core and a long sheet wound around the core, wherein the long sheet comprises a base sheet, and a spacer and microcapsules located on at least a part of one or both surfaces of the base sheet, the spacer is provided along the winding direction of the long sheet, the thickness of the spacer is less than 2.5mm, and the cross-sectional diameter of the roll body is 15cm or less.

The microcapsule of the roll body of the present invention is excellent in the damage-suppressing property and the transporting efficiency. The reason for the above effect is presumed as follows, but is not limited thereto.

The thickness of the spacer of the long sheet material of the roll body is less than 2.5mm. It is assumed that the thickness of the spacer is smaller than 2.5mm, so that the cross-sectional diameter of the roll body obtained by winding the long sheet material around the core is reduced, and the roll body having a larger area than a predetermined area can be accommodated, thereby improving the conveyance efficiency.

Further, it is assumed that the breakage of the microcapsules caused by the externally applied force is suppressed because the radius of curvature of the long sheet near the surface of the roll body is reduced and the strength is improved by making the cross-sectional diameter of the roll body 15cm or less.

The cross-sectional diameter of the roll body is preferably 14cm or less, more preferably 13cm or less.

The cross-sectional diameter of the roll body is preferably 10cm or more, more preferably 11cm or more, from the viewpoint of improving the transport efficiency.

The cross-sectional diameter of the roll body is preferably 5cm to 15cm from the viewpoint of both excellent microcapsule breakage inhibition and transportation efficiency.

The lower limit of the cross-sectional diameter of the roll body is not particularly limited, and can be 1cm or more, for example.

(Long sheet)

The long sheet has a base sheet, and spacers and microcapsules located on at least a part of one or both surfaces of the base sheet.

The material of the base sheet is not particularly limited, and examples thereof include pulp paper, resin sheet, synthetic paper, and laminate thereof.

Examples of the pulp paper include high-quality paper, medium-quality paper, base paper, neutral paper, acid paper, coated paper, on-press coated paper, cast coated paper, light coated paper, paper impregnated with a resin, recycled paper, and the like.

Examples of the resin sheet include polyester sheets such as polyethylene terephthalate sheets, cellulose sheets such as cellulose triacetate, polyolefin sheets such as polypropylene and polyethylene, and polystyrene sheets.

Specific examples of the synthetic paper include paper (YUPO or the like) in which polypropylene, polyethylene terephthalate or the like is biaxially stretched to form a plurality of micro voids, and paper made of synthetic fibers such as polyethylene, polypropylene, polyethylene terephthalate or polyamide.

In the case where the long sheet is a measurement sheet, the long sheet is preferably a resin sheet, synthetic paper or a laminate of these, and more preferably a resin sheet, from the viewpoint of improving the color development density.

The substrate sheet is preferably subjected to a surface treatment such as corona discharge treatment, whereby adhesion to microcapsules, spacers, and the like can be improved.

The thickness of the base sheet is preferably 10 μm to 300 μm, more preferably 30 μm to 250 μm, and even more preferably 50 μm to 150 μm from the viewpoint of improving the breakage suppression property and the transport efficiency of the microcapsules.

The long sheet of the present invention has spacers.

The spacers may be provided on one surface of the base sheet or on both surfaces. From the viewpoint of manufacturing cost, the spacer is preferably provided on one surface of the base material sheet.

The spacer may be provided on the base sheet so as to be in contact with the base sheet, or may be provided on the microcapsule, the adhesive layer, or the like.

The spacer may be provided along the winding direction of the base sheet, or may be provided on a part of the winding direction or may be provided on the whole of the winding direction. The spacer is preferably provided on the whole of the long sheet in the winding direction from the viewpoint of improving the breakage suppression of the microcapsules.

In the case where the spacer is provided at a part of the winding direction, the spacer may be provided in a belt shape (continuously) or may be provided intermittently.

From the viewpoint of improving the breakage suppression property of the microcapsules, the spacers are preferably provided at one end or both ends of the base sheet in the direction orthogonal to the winding direction, and more preferably at both ends.

The term "disposed at one end or both ends" includes not only the case where the end of the spacer overlaps or exceeds the end of the base material sheet but also the case where the distance between the end of the spacer and the end of the base material sheet is 50mm or less.

"orthogonal" means a direction of 60 ° to 120 °, preferably 70 ° to 110 °, more preferably 80 ° to 100 °, and even more preferably 85 ° to 95 ° with respect to the winding direction of the base sheet.

The spacer can comprise an adhesive. The binder may be a rubber material, a foamed polymer, or the like.

Examples of the rubber material include natural rubber, isoprene rubber, styrene rubber, polyolefin rubber (ethylene propylene diene rubber, chlorosulfonated polyethylene, etc.), nitrile rubber, butadiene rubber (acrylonitrile butadiene rubber, etc.), neoprene rubber, polyurethane rubber, silicone rubber, and these foams.

Examples of the foam polymer include foams of polymers such as polyolefin (polyethylene, polypropylene, etc.), polystyrene, polyethylene (polyvinyl chloride, polyvinyl acetate, etc.), etc.

From the viewpoint of improving the breakage suppression of the microcapsules, a rubber material is preferable, and polyolefin rubber, chloroprene rubber, silicone rubber, or these foams are more preferable.

The spacer may contain 1 or 2 or more additives. Examples of the additives include pigments, dyes, ultraviolet absorbers, light stabilizers, antioxidants, paraffin waxes, and odor inhibitors.

The thickness of the spacer is preferably 2.3mm or less, more preferably 2.1m or less, from the viewpoint of improving the conveying efficiency. Further, the thickness of the spacer is set to 2.3mm or less, whereby the manufacturing cost can be reduced, and it is preferable from the viewpoint of environmental protection.

The thickness of the spacer is preferably 0.2mm or more, more preferably 0.5mm or more, further preferably 1.0mm or more, further preferably 1.2mm or more, from the viewpoint of improving the breakage inhibition of the microcapsules.

The thickness of the spacer is preferably 0.5mm or more and less than 2.5mm, more preferably 0.5mm to 2.3mm, and even more preferably 0.6mm to 2.0mm, from the viewpoint of both excellent microcapsule breakage inhibition and transportation efficiency.

The deviation in the winding direction of the thickness of the spacer is preferably 10% or less, more preferably 5% or less, and further preferably 3% or less. The lower limit of the deviation is not particularly limited, and may be set to 0%.

By making the variation in the winding direction of the thickness of the spacer 10% or less, the cross-sectional diameter of the roll body can be easily adjusted.

In the case where a plurality of spacers are provided, for example, in the case where the spacers are provided at both ends of the base sheet in the direction orthogonal to the winding direction, the variation in the winding direction of the plurality of spacers is preferably 10% or less, more preferably 5% or less, and still more preferably 3% or less. The lower limit of the deviation is not particularly limited, and may be set to 0%.

The shore hardness of the spacer is preferably 20HS or more, more preferably 35HS or more, still more preferably 40HS or more, and still more preferably 55HS or more, from the viewpoint of improving the fracture suppression of the microcapsule.

The upper limit of the shore hardness of the spacer is not particularly limited, and may be, for example, 100HS or less.

The method for providing the spacers is not particularly limited, and the spacers can be provided on the surface of the base sheet by attaching a member containing a rubber material or the like using a double-sided tape, an adhesive or the like.

The long-sized sheet has microcapsules on a portion of the surface of the base sheet on which the spacers are provided. The microcapsules may be formed as capsules that are broken by pressurization.

The microcapsules may be provided on one side or both sides of the base sheet. From the viewpoint of manufacturing cost, the microcapsules are preferably provided on one surface of the base sheet.

The microcapsules may be provided on a part of the surface of the base sheet or may be provided on the whole. The microcapsules may be provided on the whole of the base sheet except for the portion where the spacers are provided, or the microcapsules may be provided on the whole of the base sheet with the spacers provided thereon.

The microcapsule can contain 1 or more than 2 kinds of leuco dye, diazo compound and other chromophoric agents. By using a color former, a long sheet can be used as a color former which develops color by pressurization. In the case of use as a color-developing sheet, it is generally used together with a color-developing sheet.

The color former is a dye that develops color by reacting with the color former, and includes not only a dye that changes color from a colorless state to a colored state, but also a dye that changes color from a colored state to a colored state of another hue.

Examples of the leuco dye that can be used include compounds known for use in pressure-sensitive copying paper and heat-sensitive copying paper include triphenylmethane phthalide compounds, fluoran compounds, phenothiazine compounds, indole phthalide compounds, leuco gold amines, rhodamine lactams, triphenylmethane compounds, diphenylmethane compounds, triazene compounds, spiropyran compounds, fluorene compounds, and the like.

More specifically, examples of the leuco dye include 3- (4-diethylamino-2-ethoxyphenyl) -3- (1-ethyl-2-methylindol-3-yl) -4-azaphthalide, 3- (4-diethylamino-2-ethoxyphenyl) -3- (1-n-octyl-2-methylindol-3-yl) phthalide, 3- [2, 2-bis (1-ethyl-2-methylindol-3-yl) vinyl ] -3- (4-diethylaminophenyl) -phthalide, 9- [ ethyl (3-methylbutyl) amino ] spiro [ 12H-benzo [ a ] xanthen-12, 1' (3 ' H) isobenzofuran ] -3' -one, 2-anilino-6-dibutylamino-3-methylfluoran, 6-diethylamino-3-methyl-2- (2, 6-xylyl) -fluoran, 2- (2-chloroanilino) -6-dibutylamino fluoran, 3-bis (4-dimethylaminophenyl) -6-dimethylaminophthalide, 2-diethylamino-3-fluoran, and the like.

The microcapsules can contain 1 or more than 2 solvents.

Examples of the solvent that can be used include alkyl naphthalene solvents such as diisopropylnaphthalene, diaryl alkane solvents such as 1-phenyl-1-xylylethane, alkyl biphenyl solvents such as isopropylbiphenyl, aromatic hydrocarbon solvents such as triarylmethane solvents, alkylbenzene solvents, benzyl naphthalene solvents, diaryl alkylene solvents, aryl indane solvents, aliphatic hydrocarbon solvents such as dibutyl phthalate and isoparaffin, soybean oil, corn oil, cotton seed oil, rapeseed oil, olive oil, coconut oil, castor oil, natural animal and vegetable oil solvents such as fish oil, and mineral oil solvents.

The microcapsules may contain 1 or 2 or more additives. Examples of the additives include ultraviolet absorbers, light stabilizers, antioxidants, paraffin waxes, odor inhibitors, and the like.

The wall material of the microcapsule is not particularly limited, and may be any of water-insoluble polymers and oil-insoluble polymers that have been conventionally used as wall materials of microcapsules containing leuco dyes for pressure-sensitive recording materials, and examples thereof include polyurethane, polyurea, polyurethaneurea, melamine-formaldehyde resin, acrylic resin, and gelatin.

From the viewpoint of increasing the color development concentration, the volume-based median particle diameter (hereinafter, sometimes referred to as average particle diameter) of the microcapsules is preferably 1 μm or more, more preferably 1 μm to 100 μm, and still more preferably 1 μm to 50 μm.

In the present invention, the median particle diameter based on the volume of the microcapsule is a diameter at which the total volume of the particles on the large diameter side and the small diameter side is equal when the particle diameter at which the volume of the entire microcapsule is accumulated to 50% is divided into two thresholds. I.e. the median particle diameter corresponds to the so-called D50.

In the present invention, the median particle diameter of the microcapsules is the average value of the sizes of all microcapsules lying in the range of 500 μm×500 μm, which is obtained by photographing the surface of a long-sized sheet on which the microcapsules are disposed with an optical microscope at 1000 times.

In the examples described below, the median particle diameter (average particle diameter) of the microcapsules was measured by the above method.

The microcapsules can be provided on the surface of the base sheet by applying a dispersion of the microcapsules in water, a conventionally known solvent, or the like to the surface of the base sheet, and drying the dispersion. The group of microcapsules disposed on the substrate is collectively referred to as a microcapsule-containing layer. In the case where the microcapsules contain a color former, the microcapsule-containing layer is also referred to as a color former layer.

The microcapsules may be produced by a conventionally known method such as interfacial polymerization, internal polymerization, phase separation, external polymerization, or coacervation, or may be commercially available in the form of a dispersion.

The dispersion of the microcapsules may contain a binder, and examples thereof include styrene-butadiene copolymer latex, vinyl acetate latex, acrylic latex, polyvinyl alcohol, polyacrylic acid, maleic anhydride-styrene copolymer, starch, casein, acacia, gelatin, carboxymethyl cellulose, methyl cellulose, and the like.

The coating method is not particularly limited, and an air knife coater, a bar coater, a curtain coater, a gravure coater, an extrusion coater, a die coater, a slide bead coater, a blade coater, or the like can be used.

The long sheet may have an adhesive layer between the base sheet and the microcapsule-containing layer. This can improve the adhesion of the microcapsules to the long sheet. In the case where the long sheet has an adhesive layer, microcapsules are provided on the surface of the adhesive layer. The long sheet may have 2 or more adhesive layers.

The adhesive layer may contain a resin. Examples of the resin include styrene butadiene resin, styrene (meth) acrylic resin, olefin resin, urethane resin, polyester resin, and polyvinyl alcohol resin. In the present invention, (meth) acryl means at least one of acryl and methacryl.

And, the adhesive layer may contain the above-mentioned additives.

The thickness of the adhesive layer is not particularly limited, and may be, for example, 0.01 μm to 2 μm.

The adhesive layer can be formed by applying a composition containing the above resin or the like to the surface of the base sheet and drying the same.

In one embodiment, the long sheet material provided in the roll body of the present invention is used for a test piece.

Examples of the method of the measurement sheet include a single-piece type and a two-piece type. The single sheet is a sheet having a color former layer and a later-described color former layer on the same sheet. The two sheets are a type in which 2 kinds of sheets, that is, a long sheet having a color former layer and a sheet having a color former layer, which will be described later, are prepared and combined at the time of use.

For example, when the roll body of the present invention includes a long sheet containing a color former in a microcapsule, the roll body can be used as a two-piece type load cell set together with a sheet including a color former layer. In general, two-piece type is used for low pressure.

For example, in the case where the roll body of the present invention includes a long sheet containing a color former in a microcapsule, a color former layer described later is provided between the color former layer and the adhesive layer, and the roll body is used alone as a monolithic pressure-sensitive adhesive sheet. In general, monolithic type is used for high voltage.

The roll body of the present invention is excellent in the breakage inhibition of microcapsules, and therefore can be preferably used as a low-pressure measurement load cell set for breaking microcapsules at a low pressure (for example, 0.1MPa or less).

In the case where the long sheet is used for a gauge sheet, the long sheet is pulled out from a roll body, cut into a desired size, and used for pressure measurement.

The preferred embodiment of the structure of the single-piece type developer layer and the structure of the two-piece type developer layer are the same.

The developer layer means a layer containing a developer. Examples of the color-developing agent include clay materials such as activated clay, acid clay, attapulgite, zeolite, bentonite, and kaolin, phenolic compounds, and hydroxybenzoates.

More specifically, as the color developer, 2-bis (4-hydroxyphenyl) propane [ alias: bisphenol a), 2-bis (4-hydroxyphenyl) hexafluoropropane [ alias: bisphenol AF), 2-bis (p-hydroxyphenyl) pentane, 2-bis (p-hydroxyphenyl) ethane, 2-bis (p-hydroxyphenyl) butane, 2-bis (4 ' -hydroxy-3 ',5' -dichlorophenyl) propane, 1- (p-hydroxyphenyl) cyclohexane, 1- (p-hydroxyphenyl) propane, 1- (p-hydroxyphenyl) pentane, 1- (p-hydroxyphenyl) -2-ethyl hexane, 3, 5-bis (alpha-methylbenzyl) salicylic acid and polyvalent metal salts thereof, 3, 5-bis (t-butyl) salicylic acid and polyvalent metal salts thereof, 3-alpha, alpha-dimethylbenzyl salicylic acid, polyvalent metal salts thereof, butyl p-hydroxybenzoate, benzyl p-hydroxybenzoate, 2-ethylhexyl p-hydroxybenzoate, p-phenylphenol, p-cumylphenol, and the like.

The color-developer layer may contain a binder, and examples thereof include styrene-butadiene copolymer latex, vinyl acetate latex, acrylic latex, polyvinyl alcohol, polyacrylic acid, maleic anhydride-styrene copolymer, starch, casein, gum arabic, gelatin, carboxymethyl cellulose, and methyl cellulose.

(core)

The material of the core is not particularly limited, and examples thereof include pulp paper, resin, synthetic paper, wood, metal, and the like. Among these, pulp paper is preferable from the viewpoint that the fixing strength between the core and the flange can be appropriately adjusted.

The pulp paper and synthetic paper are as described above. Examples of the resin include polyester, cellulose, polyolefin, and polystyrene. Examples of the metal include silver, copper, and nickel.

The inner diameter of the core is not particularly limited, and may be, for example, 20mm to 100mm.

The core may be provided with flanges at one or both ends, whereby unwinding and winding can be easily performed.

The material of the flange is not particularly limited, and examples thereof include pulp paper, resin, synthetic paper, wood, metal, and the like.

Next, an embodiment of the roll body according to the present invention will be described with reference to fig. 1 to 3. The roll body of the present invention is not limited to this embodiment.

Fig. 1 is a perspective view of a drum body of the present invention. Fig. 2 is a cross-sectional view taken along line A-A of a long sheet provided in the roll body of fig. 1. Fig. 3 is a B-B sectional view of the drum body.

As shown in fig. 1, a roll body 10 of the present invention includes a core 1 and a long sheet 2 wound around the core 1.

The long-sized sheet 2 has spacers 3 disposed along the winding direction X of the long-sized sheet 2.

In fig. 1, the spacers 3 may be provided at both ends in a direction orthogonal to the winding direction X of the long sheet 2.

In fig. 1, the core 1 is provided with flanges 4 at both ends.

As shown in fig. 2, the long sheet 2 includes a spacer 3, a base sheet 5, an adhesive layer 6, and microcapsules 7 (microcapsule-containing layer). In fig. 2, the spacer 3 is shown to be disposed in contact with the base sheet 5, but may be disposed on the adhesive layer 6 and the microcapsules 7.

In fig. 3, symbol L represents the cross-sectional diameter of the winding drum body 10, and symbol L represents the inner diameter of the core 1.

The roll body may be partially cut out and transported as a sheet.

In the case of overlapping and packaging the product processed into a sheet form, a method of preventing the microcapsules from being damaged by vibration or the like during transportation (a method of eliminating a gap between a packaging material and the product as much as possible, a method of sandwiching a cushioning material up and down, or the like) may be performed.

In addition, a method of preventing contact between the front and back of a sheet for low-pressure measurement including microcapsules that may be broken by a low pressure (for example, a method of sandwiching and overlapping a thick paper as a spacer in a portion that is not used for pressure determination of the sheet) may be performed.

In one embodiment, when a sheet is used for pressure measurement of a die, the long sheet is conveyed in a state of being cut into the shape of the die (sheet form).

At this time, if only the shape of the mold is cut out to provide the spacers, there is a possibility that the microcapsules existing at the portion where the sheet and the spacers contact may be destroyed.

Therefore, the shape portion of the mold and a portion (also referred to as a blank portion) different from the shape portion of the mold, which is connected to the shape portion of the mold, are cut out from the long sheet, and the spacer is provided in the blank portion, whereby the microcapsules of the sheet existing in the shape portion of the mold can be prevented from being broken and conveyed.

Examples

The above-described embodiments are specifically described below by way of examples, but the above-described embodiments are not limited to these examples.

(preparation of microcapsule dispersion liquid)

3, 3-bis (2-methyl-1-octyl-3-indolyl) phthalide (18 parts by mass) was dissolved in diarylethane (70 parts by mass) as a color former to obtain solution a.

Then, a butylene oxide adduct (0.4 parts by mass) of ethylenediamine dissolved in methyl ethyl ketone (1 part by mass) was added to the stirring solution a to obtain a solution B.

Further, a trimethylolpropane adduct (2 parts by mass) of toluene diisocyanate dissolved in methyl ethyl ketone (1 part by mass) was added to the stirring solution B to obtain a solution C.

Next, the solution C (oil phase) was added to a solution (aqueous phase) in which polyvinyl alcohol (6 parts by mass) was dissolved in water (150 parts by mass), and emulsified and dispersed.

To the emulsified and dispersed emulsion, water (300 parts by mass) was added, and the mixture was heated to 70 ℃ while stirring, and after stirring for 1 hour, the mixture was cooled to prepare a dispersion in which microcapsules containing a color former were dispersed. The average particle diameter of the obtained microcapsules was 20. Mu.m.

(preparation of composition for Forming protective ear layer)

After mixing water (75 parts by mass), sodium polyacrylate (5 parts by mass) and calcium carbonate (100 parts by mass) and dispersing them by a sand mill, styrene butadiene rubber latex (corresponding to 15 parts by mass of solid content), carboxymethyl cellulose 1% by mass aqueous solution (15 parts by mass) and sodium dodecylbenzenesulfonate 25% by mass aqueous solution (1 part by mass) were added and mixed, and further water was added to prepare a composition for forming a protective ear layer having a solid content concentration of 41.5% by mass.

(production of core A and core B)

A paper core impregnated with resin having a length of 390mm and an inner diameter of 76mm was prepared, and flanges were attached to both ends, to prepare a core a.

A paper core impregnated with resin having a length of 390mm and an inner diameter of 30mm was prepared, and flanges were attached to both ends, to prepare a core B.

The flange is made of polypropylene, and the shape of the outer periphery of the flange is regular octagon. The size of the flange (distance between 2 sides of the octagon) was adjusted to be 4em larger than the cross-sectional diameter of the roll body in each of the examples and comparative examples.

Example 1]

A biaxially stretched polyethylene terephthalate (PET) sheet was prepared, which had a thickness of 75 μm, a width of 450mm and a length of 13.1 m.

An adhesive layer A having a thickness of 0.45 μm was formed by applying an adhesive layer-forming composition A having the following composition to one surface of a biaxially stretched PET sheet using a bar coater and drying the same.

Composition A for forming an adhesive layer

14.1 parts by mass of styrene butadiene resin

( Styrene: butadiene=67:30 (mass ratio), product name: LX-407C5 manufactured by Zeon Corporation, solid content 40% by mass )

2.5 parts by mass of 2, 4-dichloro-6-hydroxy-s-triazine

(solid content 8% by mass)

0.04 part by mass of polystyrene particles

( Product name: UFN1008, manufactured by Zeon Corporation, average particle size: 2 μm and 20% by mass of solid content )

83.4 parts by mass of distilled water

The adhesive layer-forming composition B having the following composition was applied onto the adhesive layer a by a bar coater, and dried to form an adhesive layer B of 0.1 μm, thereby obtaining a laminate composed of a biaxially stretched PET sheet, the adhesive layer a and the adhesive layer B.

Composition B for forming adhesive layer

10 parts by mass of a 10.4% by mass aqueous solution of Gelatin (product name: 761 Gelatin, manufactured by Nitta Gelatin Inc.; solid content 100% by mass)

0.04 part of 3.5% by mass methanol solution of 1, 2-benzothiazolin-3-one

0.67 part by mass of a 3% by mass aqueous solution of hydroxypropyl methylcellulose (product name: metrose (registered trademark) TC5R, shin-Etsu Chemical Co., ltd.: manufactured by solid content 100% by mass)

1% by mass of sodium hydroxide aqueous solution (product name: naloaction (registered trademark) CL-95, sanyo Chemical Industries, ltd.: manufactured, solid content 1% by mass) 0.7 parts by mass

4.9 parts by mass of an antimony-doped tin oxide dispersion (product name: TDL-S, manufactured by Mitsubishi Material, 17% by mass of solid content, inorganic particles having antistatic properties)

83.7 parts by mass of distilled water

The protective ear layer forming composition was applied to both ends of the adhesive layer B of the laminate, and dried to form protective ear layers at both ends. The width of the protective ear layer was 25mm (50 mm on both sides).

The microcapsule-containing layer containing microcapsules is provided on the adhesive layer B except for the portion where the protective ear layer is formed. The median particle diameter (average particle diameter) of the microcapsules was measured by the above method and found to be 20. Mu.m.

In order to remove the protective ear layers at both ends in the width direction of the resulting sheet, the sheet was cut into a width of 360mm by a processing machine. Double-sided tape was attached to the microcapsule-containing layers on both ends in the width direction of the cut sheet, and a spacer was formed by attaching ethylene propylene diene rubber (take co., ltd. Manufactured, thickness 1.0mm, shore hardness 70HS, width 15mm; epdm rubber 1), to obtain a long-sized sheet.

The spacers are provided at both end portions in a direction along the winding direction of the long sheet and orthogonal to the winding direction.

The long sheet was wound around the core a so that the spacer of the long sheet was positioned on the inner side (core a side) and the biaxially stretched PET sheet of the long sheet was positioned on the outer side, to obtain a roll body having a cross-sectional diameter of 15cm.

< example 2 to example 23 and comparative example 1 to comparative example 4>

A roll body was produced in the same manner as in example 1, except that at least 1 condition selected from the group consisting of the cross-sectional diameter of the roll body, the material of the spacer, the thickness and shore hardness, the length of the long-sized sheet, and the kind of the core was changed to the condition shown in table 1.

The material of the spacers in table 1 is described in detail below.

EPDM rubbers 2 to 9: TAKECHI Co., LTD. Manufactured, width 15mm, thickness and Shore hardness are as shown in Table 1.

Silicone rubber 1 to silicone rubber 2: INNOVECT Co., ltd. Manufactured, width 15mm, thickness and Shore hardness are as shown in Table 1.

Foam rubber 1 to foam rubber 3: TOKIWA RUBBER CO., LTD. Manufactured, nelon, width 15mm, thickness and Shore hardness are as described in Table 1.

Foam rubber C1: TOKIWA RUBBER CO., LTD. Manufactured, neoprene foam RUBBER, width 15mm, thickness and Shore hardness are as described in Table 1.

Foam rubber C2: TOKIWA RUBBER CO., LTD. Manufactured, nelon, width 15mm, thickness and Shore hardness are as described in Table 1.

Measurement of deviation in winding direction of thickness of spacer

The long sheet was unwound from the roll body manufactured in each of examples and comparative examples, and the thickness was measured at 3 points from 3 points 15cm, 35cm, and 55cm from the longitudinal direction of the end of the spacer provided in the long sheet. The difference between the maximum value and the minimum value of the thicknesses of the total 9 points was obtained, and the difference was divided by the average value of the thicknesses of the total 9 points, and multiplied by 100 times, whereby the thickness deviation of the spacer was measured. The measurement results are shown in Table 1.

< evaluation of delivery efficiency >

The roll bodies manufactured in each of the examples and comparative examples were housed in corrugated cardboard boxes.

The size of the corrugated cardboard box is changed according to the size of the flange of the drum body, and the size is set to be just for accommodating each drum body.

The corrugated cardboard box with the drum body is stored at 1m ³ Is defined in the space of the mold.

The total storage area of the long sheets was obtained from the storage number of the spaces of the corrugated cardboard box storing the roll body in comparative example 2 and the area of the long sheets included in the roll body, and the storage area ratio of the long sheets of each example and comparative example was obtained when the total storage area was 1.0, and the results are summarized in table 1.

When the storage area ratio is large, the conveyance amount of the long sheet per unit area can be increased, and therefore the conveyance efficiency is excellent.

Evaluation of microcapsule failure inhibition

The roll bodies manufactured in each of examples and comparative examples were housed in corrugated cardboard boxes as packages in the same manner as in the conveying efficiency evaluation.

After the 1-side 3-edge 6 surface of the package was lowered (lowered height: 40 cm) according to the flow condition grade I of JIS Z0202 (2017), the roll body was taken out of the corrugated cardboard box, and a long sheet was unwound from the roll body, and the presence or absence of microcapsule breakage over the entire length was visually observed. The evaluation was performed based on the following evaluation criteria, and the results are shown in table 1.

(evaluation criteria)

A: the ratio of the area of the region where the microcapsule fracture mark (scratch) was observed to be 10% or less to the total area of the base sheet excluding the portion where the spacer was provided.

B: the above ratio is more than 10% and 30% or less.

C: the above ratio is greater than 30%.

TABLE 1

From table 1, it is clear that the roll body of the example in which the thickness of the spacer is less than 2.5mm and the cross-sectional diameter of the roll body is 15cm or less is excellent in conveying efficiency and breakage inhibition of the microcapsules as compared with the roll body of the comparative example.

It is also found that the damage suppression of the microcapsules can be further improved by comparing example 2, example 3, example 11, and example 12 with other examples and setting the thickness of the spacer to 0.5mm or more.

Further, it was found that the damage suppression of the microcapsules can be further improved by comparing example 20, example 21 and example 23 and setting the shore hardness of the spacer to 35HS or more.

It is also found that the transport efficiency can be further improved by comparing examples 5, 14, 17 and 18 and setting the cross-sectional diameter of the roll body to 5cm to 15cm.

Claims

1. A roll body comprising a core and a long sheet wound around the core,

the long sheet has a base sheet and spacers and microcapsules located on at least a part of one or both sides of the base sheet,

the spacers are arranged along the winding direction of the long-sized sheet,

the spacer has a thickness of less than 2.5mm, and,

the diameter of the section of the roller body is below 15cm.

2. The roll body of claim 1, wherein,

the spacer comprises a rubber material.

3. The roll body according to claim 1 or 2, wherein,

the thickness of the spacer is more than 0.5 mm.

4. The roll body according to claim 1 or 2, wherein,

the shore hardness of the spacer is above 35 HS.

5. The roll body according to claim 1 or 2, wherein,

6. The roll body according to claim 1 or 2, wherein,

the thickness of the spacer has a deviation of 10% or less in the winding direction.

7. The roll body according to claim 1 or 2, wherein,

the long sheet is used for a gauge sheet.