JP2010042618A - Repeatedly writable sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a repeatedly writable sheet in which writing performance and storage performance are improved. <P>SOLUTION: The repeatedly writable sheet is at least composed of a film with an adhesive layer formed on one side and of a backing sheet, wherein the adhesive layer of the film and the backing sheet are laminated to face each other. At least in a part of the other side of the film, there is formed an ink layer by printing the ink. The adhesive layer has an adhesion of 0.5-70 mN/25 mm, while the backing sheet has a smoothness of 25 sec. or higher, at least in a part corresponding to the ink layer of the film. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a sheet that can be used repeatedly for various purposes such as characters for infants and the like, practice of drawing and drawing, play with drawing, teaching materials, and the like.

  Conventionally, as a product of this type, a wax is applied on a colored mount, and a plastic film is detachably pasted on the top surface, and the top surface of the plastic film is pressed with a stick-shaped writing instrument or the like. Provide products that can freely write letters, pictures, etc., and then can erase the letters, pictures, etc. by peeling the plastic film, and repeat the display of the letters, pictures, etc. Has been.

  Such conventional products require a relatively large pressing force at the time of writing, and the pressing force causes unevenness accompanying the handwriting to remain on the wax-coated surface, which is more likely to get dust, and if left after writing It erased in a relatively short time.

  Therefore, for example, in Patent Document 1, a silicone layer having adhesive elasticity is formed on the upper surface of the colored mount, and a mat film is detachably pasted on the upper surface of the silicone layer, so that it is affected by temperature and the like. You can write letters, pictures, etc. with a light touch, there will be no handwriting, dust will not stick, letters, pictures, etc. will be maintained for a long time after writing, and there will be no film peeling sound There has been proposed a playground equipment that can be smoothly peeled off and is highly durable and practical.

  However, such educational playground equipment is usually stored in a state where the colored mount and the film overlap each other (the upper cover serves as a protective cover). However, particularly in a high temperature environment such as summer, the colored mount and the film are stored. Is stored in a state where they overlap each other for a long period of time, the colored backing sheet and the film adhere to each other (cause blocking), and cannot be used as a product. In order to prevent this, the adhesiveness of the silicone layer has been suppressed. However, when writing letters and pictures, etc., a relatively large pressing force was still necessary. In the educational use of children with weak strength, a writing instrument such as a stick having a high hardness such as plastic is required, which is problematic from the viewpoint of safety. Even though the adhesiveness is suppressed, there is still a blocking problem because a silicone layer having adhesive elasticity is provided on the mount.

JP 2001-142387 A

  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a sheet that can be repeatedly described with improved writing performance and storage performance.

  The above object of the present invention comprises at least a film in which a pressure-sensitive adhesive is applied on one side to form a pressure-sensitive adhesive layer, and a release paper covering the pressure-sensitive adhesive layer, and at least the other side of the film An ink layer is formed by printing a part of the ink layer, and the adhesive strength of the pressure-sensitive adhesive layer is 0.5 to 70 mN / 25 mm. Achieved by:

  In addition, the object of the present invention includes at least a film having a pressure-sensitive adhesive layer formed on one side and a pressure-sensitive adhesive layer, and a mount so that the pressure-sensitive adhesive layer and the mount of the film face each other. An ink layer is formed by printing ink on at least a part of the other surface of the film, and the adhesive layer has an adhesive strength of 0.5 to 70 mN / 25 mm. The mount is achieved by providing a sheet that can be repeatedly described, wherein the smoothness of at least a portion corresponding to the ink layer of the film is 25 seconds or more.

  The above object of the present invention is achieved by providing a sheet that can be repeatedly described, characterized in that a release paper that covers the pressure-sensitive adhesive layer is provided between the film and the mount. Is achieved.

  Furthermore, the object of the present invention is to provide a sheet that can be repeatedly described, characterized in that a color difference ΔE between the ink layer and at least a portion corresponding to the ink layer of the mount is 10.0 or more. Is achieved more effectively.

  According to the sheet that can be repeatedly described according to the present invention, it comprises at least a film in which a pressure-sensitive adhesive is applied to one side to form a pressure-sensitive adhesive layer, and a release paper that covers the pressure-sensitive adhesive layer, and the other side of the film. Ink is printed on at least a part of the surface to form an ink layer. Furthermore, since the adhesive strength of the adhesive layer is 0.5 to 70 mN / 25 mm, it is possible to improve writing performance and storage performance. become able to.

  In addition, according to the sheet that can be repeatedly described according to the present invention, at least a film having a pressure-sensitive adhesive layer formed on one side and a pressure-sensitive adhesive layer is provided, and the pressure-sensitive adhesive layer of the film is opposed to the paper mount. The ink layer is printed on at least a part of the other side of the film to form an ink layer, and the adhesive layer has an adhesive strength of 0.5 to 70 mN / 25 mm. Since the smoothness of at least the portion corresponding to the ink layer of the film is 25 seconds or more, the writing performance and the storage performance can be improved.

  Furthermore, storage performance can be further improved by providing release paper that covers the adhesive layer between the film and the mount.

  Hereinafter, a sheet that can be repeatedly described according to the present invention will be described in detail with reference to the drawings. In addition, this invention is not necessarily limited to the following embodiment, Of course, the structure can be changed suitably in the range which does not deviate from a claim.

  FIG. 1 is a perspective view of a sheet (hereinafter referred to as “the present sheet”) 1 that can be repeatedly described according to the present invention, and FIG. 2 is a cross-sectional view taken along the line II of FIG. That is, as shown in the figure, this sheet 1 comprises at least a film 3 having a pressure-sensitive adhesive layer 2 formed by applying a pressure-sensitive adhesive on one side, and a mount 4, and the pressure-sensitive adhesive of the film 3 on the upper surface of the mount 4. The layers 2 are stacked so as to face each other. Ink is printed on at least a part of the other surface of the film 3 to form an ink layer 5.

  As the film 3, an ethylene-vinyl alcohol copolymer comprising a thermoplastic resin alone such as polyethylene, polypropylene, polybutene, methacryl, thermoplastic polyester, polyvinyl alcohol, and fluorine, and various copolymer resins. Various known materials such as a film, a fluorine resin film such as polyvinyl fluoride, polyvinylidene fluoride, and ethylene tetrafluoroethylene, and an olefin film coated with a urethane or acrylic coating agent can be used.

  Moreover, it is preferable that the film 3 used for this sheet | seat 1 is 500 micrometers or less in thickness. If the thickness of the film 3 exceeds 500 μm, the pressing force required at the time of writing increases, and the writing performance may deteriorate.

  The pressure-sensitive adhesive layer 2 formed on the film 3 has an adhesive force measured in accordance with JIS-Z0237 of 0.5 to 70 mN / 25 mm, preferably 10 to 60 mN / 25 mm. Thereby, the writing performance and storage performance of the sheet 1 can be improved. That is, it becomes possible to increase the adhesiveness than the conventional one, and it becomes possible to describe characters etc. even with light writing pressure, so for example, it was made of cardboard etc. without using a plastic rod-like thing It is possible to write with a safe thing such as a writing thing 6 (one shaped like a writing instrument). In addition, “improvement of storage performance” in the specification of the present application means that the adhesive layer 2 of the film 3 is less likely to stick to the mount 4 over time.

  When the adhesive strength is less than 0.5 mN / 25 mm, blocking problems do not occur and storage performance can be improved, but the pressing force during writing cannot be lowered, and a stick-shaped writing instrument is provided. It is necessary and cannot improve the writing performance. On the other hand, when the adhesive strength exceeds 70 mN / 25 mm, the writing performance can be improved, but a blocking problem may occur, and the storage performance is deteriorated.

  The adhesive strength can be adjusted by using an adhesive having low adhesiveness or by suppressing the adhesive on the surface of the adhesive layer 2. Here, as a method for suppressing the glue, varnish or the like can be printed on a part of the surface of the pressure-sensitive adhesive layer 2 or the entire surface of the pressure-sensitive adhesive layer 2.

  Moreover, as an adhesive apply | coated to the single side | surface of the film 3, well-known various adhesives, such as an acrylic type, rubber type, a vinyl ether type, a silicon type, a urethane resin type, can be used. Among these, acrylic and urethane resin-based pressure-sensitive adhesives are preferable because they are excellent in removability and re-adhesion.

  Furthermore, the ink applied to the other surface of the film 3, that is, the surface opposite to the surface on which the pressure-sensitive adhesive layer 2 of the film 3 is provided, and the ink forming the ink layer 5 includes oil-based ink, ultraviolet curable ink, and the like. Various known ones can be used. However, the ink applied to the film 3 is preferably not a dark color but a light color such as white in consideration of character expression.

  Further, at least a portion 7 of the mount 4 corresponding to the ink layer 5 of the film 3 has a smoothness measured in accordance with JIS-P8119 of 25 seconds or more, preferably 50 seconds or more. The adhesiveness with the film 3 becomes high because the smoothness of the mount 4 is 25 seconds or more. Thereby, writing performance can be improved and also expression of characters etc. can be improved. If the smoothness is less than 25 seconds, the pressing force when writing characters or the like cannot be reduced, the writing performance of the sheet 1 cannot be improved, and the hardness is high when writing. There may be a need for a rod-shaped one.

  As a method for imparting smoothness to the mount 4, besides increasing the smoothness of the mount 4 itself, it is also possible to increase the smoothness by various known methods such as laminating or applying ink. Is possible.

  As the mount 4, various known papers such as cardboard and paperboard can be used. As described above, since various types of cardboard can be used as the mount 4, various printing and decoration such as foil stamping can be performed according to the purpose of use of the sheet 1. It can also improve the performance. In this way, when a printable paper is used as the mount 4, for example, characters are printed on a portion 7 corresponding to the ink layer 5 provided on the film 3 on the surface facing the film 3 of the mount 4. By tracing the characters printed on the mount 4 from above, it can also be used for child education. Such printing can be performed not on the mount 4 but also on the upper surface of the ink layer 5 of the film 3.

  Further, the color difference ΔE measured according to JIS-P8150 between the ink layer 5 and the portion 7 of the mount 4 corresponding to the ink layer 5 is 10.0 or more, preferably 15.0 to 25.0. It is preferable to adjust the color tone of the ink layer 5 and the portion 7 corresponding to the ink layer 5 of the mount 4. In this case, from the viewpoint of character development, it is preferable that light ink is used for the ink layer 5 and that at least a portion 7 of the mount 4 corresponding to the ink layer 5 is colored or printed darkly. In addition, when ΔE is less than 10.0, written characters or the like on the ink layer 5 of the film 3 do not appear visibly, or even if characters or the like appear visibly, the written characters or the like can be seen. It is difficult, that is, the character expression is reduced.

  Further, it is preferable to fix one side (one end) of the film 3 to the mount 4. As a means for fixing the film 3 to the mount 4, an adhesive or the like is applied to one side of the film 3 and adhered to the mount 4, and as shown in FIG. Various means such as sandwiching and fixing the corners of the film 3 can be used. By fixing one side (one end) of the film 3 to the mount 4, it becomes easy for an infant to easily return the film 3 to a certain place when it is re-peeled and re-adhered. By storing the release paper 9 between the mounts 4, the film 3 or the mount 4 can be prevented from being lost.

  The present sheet 1 thus configured is described by writing characters and the like from above the ink layer 5 of the film 3 in a state where the film 3 is laminated on the mount 4 and then peeling the film 3 from the mount 4. You can erase the characters you have made. Thereafter, the character 3 can be written again by laminating the film 3 on the mount 4 again. Thus, this sheet 1 can repeat description and deletion of characters and the like.

  Further, when the sheet 1 is stored or transported (when not in use), it is preferable that a release paper 9 is provided between the film 3 and the mount 4 as shown in FIG. Thereby, this sheet | seat 1 can be stored, without the base paper 4 and the adhesive layer 2 provided in the film 3 contacting. Therefore, even if it is stored for a long time in a high temperature environment such as summer, blocking does not occur and the storage performance of the sheet 1 can be further improved.

  The release paper 9 used for the sheet 1 includes a silicon resin, an acrylic resin, a long-chain alkyl polymer, a polyolefin, an alkyd resin, a fluorine compound, etc. on the surface of the film 3 in contact with the portion where the pressure-sensitive adhesive layer 2 is formed. Various known materials such as tack paper, high-quality paper, kraft paper, coated paper, glassine paper, and recycled paper on which the release agent is printed or applied can be used.

  Next, another embodiment of the present invention will be described. FIG. 4 is a schematic cross-sectional view of a sheet according to another embodiment of the present invention. As shown in the figure, this sheet 1 ′ is configured to include at least a film 3 in which a pressure-sensitive adhesive is applied on one side and a pressure-sensitive adhesive layer 2 is formed, and a release paper 9. That is, the other configuration except that the mount 4 is not provided is the same as that of the sheet 1 that can be repeatedly described according to the present invention. Therefore, in the following, the same reference numerals are given to the same components as those of the seat 1, and the description thereof is omitted.

  Similarly to the sheet 1, ink is printed on at least a part of the other surface of the film 3, that is, the surface opposite to the surface on which the pressure-sensitive adhesive layer 2 of the film 3 is provided. The adhesive strength of the pressure-sensitive adhesive layer 2 is 0.5 to 70 mN / 25 mm.

  The sheet 1 ′ thus configured has the release paper 9 peeled off during use, and the characters 3 and the like are repeatedly described by pasting the film 3 having the adhesive layer 2 on, for example, a refrigerator, a wall, a tile, a desk or the like. can do. In addition, although the target object which affixes the film 3 can be affixed on a well-known various thing, it is preferable to affix and use on a thing with high smoothness. Specifically, the object to which the film 3 is pasted is the ink layer 5 and the object of the film 3 having a smoothness measured according to JIS-P8119 of 25 seconds or more and measured according to JIS-P8150. The color difference ΔE is preferably 10.0 or more.

  At this time, the peripheral edge of the film 3 is adhesive so that the sheet 1 ′ is not displaced or dropped when the sheet 1 ′ is attached to a highly smooth surface, particularly a vertical surface. It is preferable to keep the property strong. At that time, if the adhesive strength measured in accordance with JIS-Z0237 is 20 to 70 mN / 25 mm, the adhesive strength of the peripheral edge of the film 3 will not be peeled off even if it is attached to a vertical surface, and Re-peeling is possible even with this force.

  As described above, the sheet that can be repeatedly described according to the present invention has been described in detail. However, the present invention is not limited to the shape of the film 3 or the mount 4, but various known shapes such as a circle, a heart shape, and a star shape. It can be changed as appropriate.

  In order to confirm the effect of the sheet that can be repeatedly described according to the present invention, the following various samples were prepared, and a test for evaluating the quality of each sample was performed. Note that the present embodiment does not limit the present invention, and it is needless to say that the configuration can be changed as appropriate without departing from the scope of the claims.

  Fifteen types of sheets that can be repeatedly described according to the present invention (referred to as “Example 1” to “Example 15”) were prepared as shown in Table 1, and these Examples 1 to In order to make a comparison with Example 15, two types of sheets (referred to as “Comparative Example 1” and “Comparative Example 2”) were produced in the configuration shown in Table 1.

[Example 1]
A polyester film E5107 manufactured by Toyobo Co., Ltd. is used as the film, and a urethane resin adhesive is used as an adhesive on one side of the film, and an adhesive layer adjusted to have an adhesive strength of 70 mN / 25 mm is formed. In addition, a white ink layer was formed on the other surface using white ink.
Further, as the mount, a commercially available coated cardboard having a surface smoothness of 50 seconds and a dark blue color was used.

  Further, Examples 2 to 15 and Comparative Examples 1 and 2 were prepared in the same manner as in Example 1 except for the conditions shown in Table 1, and the present invention was evaluated. In addition, the plus cover PP20 of DIC Corporation was used as PP laminate, and the color quality paper (medium thickness blue) made by Daio Paper Co., Ltd. was used as the quality paper.

  “Smoothness (seconds)” in Table 1 is a value measured in accordance with JIS-P8119.

  “Adhesive strength (mN / 25 mm)” is a value obtained by measuring the adhesive strength of the adhesive layer of the film to the SUS plate according to JIS-Z0237.

“Color difference (ΔE)” is the color difference between the ink layer provided on the film and the mount of the part corresponding to this ink layer. L ^* , a ^* , b ^* are measured with a spectral white photometer, and JIS -A value calculated according to P8150.

  Table 1 shows the results of quality evaluation for all of these Examples and Comparative Examples, that is, the evaluation of character expression and sticking over time. This quality evaluation was performed under environmental conditions of a temperature of 23 ± 2 ° C. and a humidity of 50 ± 2% in accordance with JIS-P8111.

Here, “expression of characters” was written on the film as ABC, 123, such as “Iroha”, and the visual evaluation of the clarity, that is, the evaluation of the writing performance, and the evaluation criteria were as follows.
A: All types of characters are clear.
○: Some characters are blurred, but can be read even with kanji with many strokes.
Δ: Kanji with many strokes is difficult to read.
×: Characters cannot be recognized.

In addition, “sticking with time” means that the adhesive layer of the film and the backing paper are pasted together, and after 24 hours have passed, the sticking when the film is peeled off from the backing paper is subjected to a sensory evaluation, that is, the protective performance is The evaluation criteria were as follows.
A: Easy to peel off.
○: There is a slight resistance to peeling, but there is no problem.
Δ: Resistance to peeling, and a level difficult for infants to peel off.
X: Cannot be peeled off or the mount is damaged when peeled off.

From Table 1, it can be seen that the sheet that can be repeatedly described according to the present invention can achieve both storage performance and writing performance.

It is a perspective view which shows the time of use of the sheet | seat which can be described repeatedly concerning this invention. It is II sectional drawing of FIG. It is a schematic sectional drawing of the sheet | seat which can be described repeatedly concerning this invention which shows states other than the time of use. It is a schematic sectional drawing of the sheet | seat which can be described repeatedly concerning other embodiment of this invention.

Explanation of symbols

1,1 'Sheet 2 which can be repeatedly described according to the present invention Adhesive layer 3 Film 4 Mount 5 Ink layer 8 Cut line 9 Release paper

Claims (4)

It comprises at least a film in which a pressure-sensitive adhesive is applied on one side to form a pressure-sensitive adhesive layer, and a release paper that covers the pressure-sensitive adhesive layer,
An ink layer is formed by printing ink on at least a part of the other surface of the film,
Moreover, the adhesive strength of the said adhesive layer is 0.5-70 mN / 25mm, The sheet | seat which can be described repeatedly characterized by the above-mentioned. It comprises at least a film in which an adhesive is applied to one side and an adhesive layer is formed, and a mount, and is laminated so that the adhesive layer and the mount of the film face each other.
An ink layer is formed by printing ink on at least a part of the other surface of the film,
The pressure-sensitive adhesive layer has an adhesive strength of 0.5 to 70 mN / 25 mm,
The mount is a sheet that can be repeatedly described, wherein the smoothness of at least a portion corresponding to the ink layer of the film is 25 seconds or more.   The repeatable sheet according to claim 2, wherein a release paper that covers the pressure-sensitive adhesive layer is provided between the film and the mount.   4. The repeatable sheet according to claim 2, wherein a color difference ΔE between the ink layer and at least a portion corresponding to the ink layer of the mount is 10.0 or more. 5.

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