JP2009173307A - Pressure measuring sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure measuring sheet having a roll shape and high sensitivity which is unnecessary for any shock-absorbing material therearound when packing the pressure measuring sheet in the roll shape in a corrugated fiberboard box, and capable of preventing breakage of a micro-capsule during transporting and storing, and performing the measurement under a very low pressure. <P>SOLUTION: The pressure measuring sheet in the roll shape having micro-capsules including at least electron-imparting colorless precursor is wound around a core. Flanges are respectively provided on both ends of the pressure measuring sheet in the roll shape, and the difference (Y-X) between the length X(mm) in the width direction of the pressure measuring sheet in the roll shape and the length Y(mm) between the flanges is 5 mm or more. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a roll form in which a pressure measurement sheet having microcapsules containing at least an electron-donating colorless dye precursor used for measuring and recording a pressure distribution at a contact surface and a pressurized portion is wound around a winding core. This relates to a pressure measurement sheet.

Conventionally, pressure measurement sheets have been developed to accurately measure the balance, distribution, and size of the pressure applied between contact surfaces (contact pressure). For example, “Prescale” (trade name) from FUJIFILM Corporation. Is commercially available. This pressure measurement sheet is obtained by forming an electron-accepting compound (hereinafter, referred to as a color former) on a support having a color former layer containing a microencapsulated electron-donating colorless dye precursor (hereinafter sometimes referred to as “color former”). Overlapping the developer layer containing the developer (sometimes called "developer"), the microcapsule is destroyed by applying pressure, the color former in the microcapsule is brought into contact with the developer, and color is developed by a chemical reaction. It is something to be made.
In addition, recently, attempts have been made to make it possible to perform measurement at an extremely low pressure and to perform pressure measurement with an extremely small contact area (see Patent Document 1).

Such a pressure measurement sheet is usually stored and transported and stored in a cardboard box, but there is a problem that the microcapsules of the pressure measurement sheet are destroyed by an impact during transportation. This is because a pressure measurement sheet 1 having at least microcapsules shown in FIG. 1 is wound, and a roll-shaped pressure measurement sheet 10 provided with flanges 2 and 2 for preventing misalignment at both ends is placed in a cardboard box. When a strong impact is applied from the left as shown in the lower diagram of FIG. 1 during transportation, the flange 2 tilts and pressure is applied to the pressure measurement sheet 10 in the form of a roll connected to the flange 2, The A portion is curved and the microcapsules existing in the portion are broken, and the pressure cannot be measured.
For this reason, when packing a pressure measurement sheet in the form of a roll into a cardboard box, a large amount of cushioning material is placed around it to absorb the impact, but the measurement at the ultra-low pressure used in recent clean rooms However, the high-sensitivity pressure measurement sheet that can be used is insufficient to prevent the destruction of the microcapsules due to impact, and further improvement and development are desired at present.

JP 2000-32156 A

  An object of the present invention is to solve the conventional problems and achieve the following objects. That is, the present invention eliminates the need for a cushioning material around the pressure measurement sheet in the form of a roll in a cardboard box, prevents the destruction of the microcapsules during transportation and storage, and enables measurement at an ultra-low pressure. An object of the present invention is to provide a pressure measurement sheet in a highly sensitive roll form.

Means for solving the above problems are as follows. That is,
<1> A pressure measurement sheet in the form of a roll formed by winding a pressure measurement sheet having microcapsules containing at least an electron-donating colorless dye precursor around a winding core,
It has flanges at both ends of the pressure measurement sheet in the roll form,
The difference (Y-X) between the width-direction length X (mm) of the pressure measurement sheet in the roll form and the length Y (mm) between the flange and the flange is 5 mm or more. A pressure measurement sheet in the form of a roll.
<2> The pressure measurement sheet in roll form according to <1>, wherein the difference (Y-X) is 10 mm or more.
<3> The roll-type pressure measurement sheet according to any one of <1> to <2>, wherein a flange has a size larger than a diameter of an end face of the roll-type pressure measurement sheet.
<4> The roll-shaped pressure measurement sheet according to any one of <1> to <3>, wherein the flange has a polygonal shape of 4 or more and 12 or less.
<5> The pressure measurement sheet in a roll form according to any one of <1> to <4>, wherein a material of the flange is plastic.
<6> The pressure measurement sheet in the form of a roll according to any one of <1> to <5>, wherein the pressure measurement sheet has spacers at both ends in the width direction of the surface having the microcapsules.
<7> The pressure measurement sheet in the form of a roll according to <6>, wherein the spacer is made of either a rubber foam or an elastic foam.

  According to the present invention, conventional problems can be solved, and a pressure measuring sheet in the form of a roll is packed in a corrugated cardboard box, so that no cushioning material is required around it, and destruction of microcapsules during transportation and storage can be prevented. In addition, it is possible to provide a highly sensitive pressure measurement sheet in the form of a roll that can be measured at an ultra-low pressure.

  The pressure measurement sheet of the present invention is in the form of a roll formed by winding a pressure measurement sheet having a microcapsule containing at least an electron-donating colorless dye precursor around a winding core. It has a flange, a spacer, and other members as necessary.

  As shown in FIG. 2, the pressure measurement sheet of the present invention is in the form of a roll in which a pressure measurement sheet 1 having microcapsules containing at least a color former is wound around a core 3 having flanges 2 and 2 at both ends. A gap Z is formed between the pressure measurement sheet 10 in the roll form and the flange 3 (see FIG. 3).

In the present invention, as shown in FIG. 4, the length in the width direction of a pressure measurement sheet 10 in the form of a roll formed by winding a pressure measurement sheet 1 having a microcapsule containing at least an electron-donating colorless dye precursor around a winding core 3. The difference (Y-X) between X (mm) and the length Y (mm) between the flange 2 and the flange 2 is 5 mm or more, more preferably 10 mm or more, and further preferably 30 mm or more. The upper limit is preferably 100 mm. A length Y (mm) between the flange 2 and the flange 2 represents a length excluding a thickness portion of the flange.
When the difference (Y-X) is less than 5 mm, the flange presses the pressure measurement sheet (product) in the form of a roll when subjected to a strong impact by dropping or the like during cargo transportation, and as a result, the capsule is crushed. Sometimes.
In this case, the gap Z between the pressure measurement sheet 10 in the roll form and the flange 3 is preferably the same length at both ends of the pressure measurement sheet in the roll form, and the length of the gap Z is 2.5 mm or more. Is preferably 5 mm or more, more preferably 15 mm or more.
Thus, by providing a flange via the gap Z at both ends of the pressure measurement sheet 10 in the form of a roll, it is possible to prevent destruction of the microcapsules during transportation and storage. That is, when the pressure prevention sheet 10 in the form of a roll of the present invention shown in the upper part of FIG. 5 is put in a cardboard box and transported, when subjected to a strong impact from the left as shown in the lower part of FIG. 2 is inclined, but since there is a gap Z between the flange 2 and the pressure measurement sheet 10 in the roll form, the shock is absorbed by the gap Z, and the impact is not transmitted to the pressure measurement sheet in the roll form. Can be prevented from cracking.

−Flange−
As described above, the flanges are attached to both ends of a winding core having a predetermined length in order to form gaps at both ends of the pressure measurement sheet in the form of a roll.
There is no restriction | limiting in particular about the magnitude | size, thickness, mass, shape, material, etc. of the said flange, According to the objective, it can select suitably.
The size (diameter or diagonal line) of the flange is larger than the diameter of the end face of the pressure measurement sheet in the roll form, and the force is directly applied to the product when the pressure measurement sheet (product) in the roll form is placed. It is preferable from the point of not.
The thickness of the flange differs depending on the material and cannot be defined unconditionally. For example, in the case of a plastic flange, 3 mm to 20 mm is preferable.
The mass of the flange varies depending on the material and cannot be defined unconditionally. For example, in the case of a plastic flange, 10 g to 100 g is preferable.
The shape of the flange is preferably a polygon of 4 or more and 12 or less from the viewpoint of product handling, and particularly preferably a 6 to 8 polygon.
Examples of the material of the flange include plastic, paper, wood, metal, and the like, but plastic is particularly preferable because it is lightweight and paper cannot be used for clean room applications. Examples of the plastic include polypropylene (PP), polyethylene (PE), and polyethylene terephthalate (PET). Among these, a polypropylene with a low anisotropy in which the side surface portion of the flange has strength at any angle is particularly preferable, and examples thereof include Plapearl (manufactured by Takagi Sangyo Co., Ltd.).

-Roll core-
As described above, the winding core is not particularly limited in size, shape, material, etc., except that flanges are attached to both ends, and can be appropriately selected according to the purpose.
The size of the winding core differs depending on the material and cannot be defined unconditionally. For example, in the case of a paper winding core, a diameter of 50 mm to 105 mm is preferable. The length of the winding core can be appropriately selected according to the size of the gap Z between the pressure measurement sheet 10 in the roll form and the flange 3.
Examples of the material of the winding core include plastic, paper, wood, metal and the like. Among these, paper is particularly preferable. Examples of the paper include paper tube base paper and resin-impregnated paper.
The method for attaching the flange to the winding core is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include a method of fitting using another bush flange or a method of bonding with an adhesive. It is done.

-Pressure measurement sheet-
The pressure measuring sheet is not particularly limited as long as it has microcapsules containing at least an electron-donating colorless dye precursor (color former), and can be appropriately selected according to the purpose. For example, a color former and a solvent In which a microcapsule encapsulating a color developer and a developer that develops color by reacting with the color former are provided (preferably coated) on a single base material or on a separate base material, etc. Can be mentioned.
In the case of a so-called mono-sheet type in which the microcapsules and the developer are provided on a single base material, the pressure measurement sheet includes a base material such as a sheet or a film, and the base material on the base material. It comprises a developer-containing developer layer and a microcapsule-containing color developer layer, which are provided in this order from the material side, and pressurizes them by sandwiching them alone at a site where pressure or pressure distribution is to be measured.
In the case of a so-called two-sheet type in which the microcapsules and the developer are provided on separate substrates, the pressure measurement sheet is not contained in the developer on the substrate such as a sheet or a film. A surface comprising a material A having a developer layer and a material B having a color-encapsulating layer containing a microcapsule on a substrate such as a sheet or a film, on which the microcapsules of the material B are provided (color development) The surface of the agent layer) and the surface of the material A on which the electron accepting compound is provided (the surface of the developer layer) are overlapped with each other, and the pressure is applied by sandwiching the pressure or the pressure distribution in the site where the pressure distribution is to be measured.
In addition, the pressure measurement sheet is provided from the viewpoint of storage stability and handleability by coating the microcapsules enclosing the electron-donating colorless dye precursor and the electron-accepting compound on separate substrates. More preferably, it is configured as a two-sheet type.

-Spacer-
As shown in FIG. 6, spacers 4 and 4 are respectively formed in strips along the length direction of the pressure measurement sheet at both ends in the width direction of the surface of the pressure measurement sheet 1 of the present invention on the side having the microcapsules. It is preferable. Accordingly, the pressure measurement sheet can be wound with a space therebetween, and the microcapsules can be prevented from being damaged due to the pressure measurement sheets being in contact with each other during winding and use.
The material of the spacer is not particularly limited and can be appropriately selected according to the purpose. However, the pressure measuring sheet can be reduced in weight by being either a rubber foam or an elastic foam. To preferred. Examples of the rubber foam include natural rubber, isoprene rubber, styrene rubber, nitrile rubber, butadiene rubber, chloroprene rubber, urethane rubber, and the like. Examples of the elastic foam include foams such as polyethylene, polypropylene, polystyrene, polyvinyl chloride, and polyvinyl acetate.
The thickness of the spacer is preferably 3 mm to 15 mm.
There is no restriction | limiting in particular as a method of providing a spacer on the said pressure measurement sheet | seat, According to the objective, it can select suitably, For example, the method of sticking with a double-sided tape, the method of sticking with an adhesive agent, etc. are mentioned.

The roll-type pressure measurement sheet of the present invention is packed in a cardboard box 20 as shown in FIG. 7, and is transported and stored.
In FIG. 7, reference numeral 11 denotes a partition plate, which is provided to prevent the pressure measurement sheet 10 in the roll form of the present invention from coming into contact with the pressure measurement sheet 12 in another roll form.
In FIG. 17, reference numeral 13 denotes a cushioning material. By using the pressure measurement sheet in the form of a roll according to the present invention, the microcapsule can be prevented from being damaged even if the cushioning material is not used. A small amount is fine.
There is no restriction | limiting in particular as said cardboard box, According to the objective, it can select suitably, For example, a polypropylene cardboard is preferable.
Also, if the corrugated side corrugations (corrugations) of the corrugated cardboard box are parallel to the bottom surface, the repulsive force is small compared to ordinary corrugated corrugated cardboard, and it is easy to fold. Further, it is preferable from the point of being able to prevent damage when taking out the roll-type pressure measurement sheet from the cardboard during packaging.

  The pressure measurement sheet in the form of a roll according to the present invention can accurately measure the balance, distribution, and size of pressure, such as automobiles, construction machines, motorcycles, ships, aircraft, electronic equipment, roll nip pressure, fluid pressure. It can be applied to various fields such as medical treatment. Especially as an ultra-low pressure measurement sheet used in a clean room, confirm the uniformity of the connecting surface of the semiconductor chip and lead wire, confirm the uniformity of the squeegee pressure in the production of multilayer substrates, and mount components on the thick film substrate Confirming the parallelism of parts and contactability of connecting pins, confirmation of uniformity, balance, and pressure level of glass-to-glass bonding process in liquid crystal, plasma display and flat CRT cathode ray tube manufacturing , And the like.

  Examples of the present invention will be described below, but the present invention is not limited to these examples.

Example 1
<Preparation of pressure measurement sheet>
On a polyethylene terephthalate (PET) film having a width of 450 mm and a thickness of 75 μm, the following color former layer forming coating solution and the following protective ear layer forming coating solution are sequentially applied without any gaps, and then dried to obtain a color former. An electron donating colorless dye sheet having a layer width of 400 mm and a protective ear layer width of 25 mm on one side (50 mm on both sides) was prepared.

-Coating solution for forming color former layer-
18 parts by mass of Compound A represented by the following structural formula as a color former was dissolved in 70 parts by mass of diarylethane to obtain Solution A. Further, 0.4 part by mass of an ethylenediamine butylene oxide adduct dissolved in 1 part by mass of methyl ethyl ketone was added to the stirring solution A to obtain a solution B. Furthermore, 2 parts by mass of a trimethylolpropane adduct of tolylene diisocyanate dissolved in 1 part by mass of methyl ethyl ketone was added to the solution B being stirred to obtain a solution C.
Next, the solution C was added to a solution obtained by dissolving 6 parts by mass of polyvinyl alcohol in 150 parts by mass of water, and emulsified and dispersed. 300 parts by mass of water was added to the emulsified liquid after emulsification and dispersion, and the mixture was heated to 70 ° C. with stirring, stirred for 1 hour and then cooled to prepare a microcapsule liquid containing microcapsules encapsulating the color former. The median diameter of the obtained microcapsules based on the volume standard was 20 μm. The median diameter was measured using a multisizer (manufactured by Coulter). The prepared microcapsule solution was used as a coating solution for forming a color former layer.

-Protective ear layer forming coating solution-
After mixing 75 parts by weight of water, 5 parts by weight of sodium polyacrylate, and 100 parts by weight of calcium carbonate and dispersing with a sand mill, the SBR latex is equivalent to 15 parts by weight of solid content, and 15 parts by weight of an aqueous solution of 1% by weight of carboxymethyl cellulose. Then, 1 part by mass of an aqueous solution of 25% by mass of sodium dodecylbenzenesulfonate was added and mixed, and water was further added to adjust the solid content concentration to 41.5% by mass to prepare a coating solution for forming a protective ear layer.

The central part of the obtained sheet was cut into a width of 350 mm using a processing machine. The following double-sided tape is affixed to both edge portions of the cut sheet, the following spacer is affixed, wound up on a flanged core shown in FIG. 2, and has a cross-sectional diameter of 170 mm and a mass of 800 g as shown in FIG. A roll-shaped pressure measurement sheet was prepared.
The difference (Y-X) between the length X (mm) in the width direction of the pressure measurement sheet in the roll form of Example 1 and the length Y (mm) between the flanges is 30 mm. A gap Z of 15 mm is formed.

-Spacer-
Material: Neoprene foam rubber (manufactured by Tokiwa Rubber Co., Ltd.), width 15 mm, thickness 5 mm
-Double-sided tape-
Japanese paper + acrylic adhesive (manufactured by Sekisui Chemical Co., Ltd., double tack tape # 595), width 10 mm
-Roll core-
Made of paper (resin impregnation), length 390mm
−Flange−
Material: Polypropylene (PP), Shape: Octagon, Size: 210mm, Thickness: 5mm

(Example 2)
-Production of pressure measurement sheet-
In Example 1, the pressure measurement sheet of the roll form of Example 2 was produced like Example 1 except having changed the length of the winding core into 400 mm.
The difference (Y-X) between the length X (mm) in the width direction of the roll-shaped pressure measurement sheet of Example 2 and the length Y (mm) between the flanges is 40 mm. A gap Z of 20 mm is formed.

(Example 3)
-Production of pressure measurement sheet-
In Example 1, the pressure measurement sheet of the roll form of Example 3 was produced like Example 1 except having changed the length of the winding core into 370 mm.
The difference (Y-X) between the length X (mm) in the width direction of the roll-shaped pressure measurement sheet of Example 3 produced and the length Y (mm) between the flanges is 10 mm, and both sides A gap Z of 5 mm is formed.

Example 4
-Production of pressure measurement sheet-
In Example 1, a roll-shaped pressure measurement sheet of Example 4 was produced in the same manner as in Example 1 except that the length of the winding core was changed to 365 mm.
The difference (Y-X) between the length X (mm) in the width direction of the roll-shaped pressure measurement sheet of Example 4 and the length Y (mm) between the flanges is 5 mm. A gap Z of 2.5 mm is formed.

(Comparative Example 1)
-Production of pressure measurement sheet-
In Example 1, a roll-type pressure measurement sheet of Comparative Example 1 was produced in the same manner as Example 1 except that the length of the winding core was changed to 363 mm.
The difference (Y-X) between the length X (mm) in the width direction of the roll-shaped pressure measurement sheet of Comparative Example 1 and the length Y (mm) between the flanges is 3 mm. A gap Z of 1.5 mm is formed.

<Drop test>
A pressure measurement sheet in the form of each roll was placed in a cardboard box, and one corner, three ridges, and six surfaces were dropped based on the distribution condition level III of JIS Z0202, and evaluated according to the following criteria. The results are shown in Table 1.
〔Evaluation criteria〕
○: No trace of the microcapsule was found.
(Triangle | delta): The trace which the microcapsule was destroyed was recognized slightly (a level which can be actually used).
X: Many traces of the microcapsules were observed.

  The roll pressure measurement sheet of the present invention can accurately measure the balance, distribution, and size of pressure, such as automobiles, construction machines, motorcycles, ships, aircraft, electronic equipment, nip pressure of rolls, fluid pressure, medical care. It can be applied to various fields such as.

FIG. 1 is a view showing a pressure measuring sheet in the form of a conventional roll and a state when the sheet receives an impact. FIG. 2 is a diagram showing an example of a flanged core used in the roll-type pressure measurement sheet of the present invention. FIG. 3 is a diagram showing an example of a pressure measurement sheet in the form of a roll according to the present invention. FIG. 4 is an explanatory diagram showing an example of a pressure measurement sheet in the form of a roll according to the present invention. FIG. 5 is a diagram showing a pressure measurement sheet in the form of a roll according to the present invention and a state when the sheet receives an impact. FIG. 6 is a view showing a state in which a spacer is attached to the pressure measurement sheet of the present invention. FIG. 7 is a view showing a state in which the pressure measurement sheet in the form of a roll according to the present invention is packed in a cardboard box.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pressure measurement sheet 2 Flange 3 Winding core 4 Spacer 10 Roll form pressure measurement sheet 20 Corrugated cardboard box

Claims (7)

A pressure measurement sheet in the form of a roll formed by winding a pressure measurement sheet having microcapsules containing at least an electron-donating colorless dye precursor around a winding core,
It has flanges at both ends of the pressure measurement sheet in the roll form,
The difference (Y-X) between the width-direction length X (mm) of the pressure measurement sheet in the roll form and the length Y (mm) between the flange and the flange is 5 mm or more. A pressure measurement sheet in the form of a roll.   The pressure measurement sheet in the form of a roll according to claim 1, wherein the difference (Y-X) is 10 mm or more.   The roll-type pressure measurement sheet according to claim 1, wherein the flange has a larger size than a diameter of an end face of the roll-type pressure measurement sheet.   The pressure measurement sheet in the form of a roll according to any one of claims 1 to 3, wherein the flange has a polygonal shape of 4 or more and 12 or less.   The roll-shaped pressure measurement sheet according to any one of claims 1 to 4, wherein a material of the flange is plastic.   The pressure measurement sheet in the form of a roll according to any one of claims 1 to 5, wherein the pressure measurement sheet has spacers at both ends in the width direction of the surface having the microcapsules.   The pressure measuring sheet in the form of a roll according to claim 6, wherein a material of the spacer is any one of a rubber foam and an elastic foam.

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