JP2006248120A - Decorative sheet and plastering method of decorative sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a decorative sheet capable of preventing an elongation and distortion of a decorative surface in case of plastering the decorative sheet on a three-dimensional body to be plastered and forming the three-dimensional decorative surface, and to provide a plastering method of the decorative sheet. <P>SOLUTION: The decorative sheet 1 has a decorative film 5 and an application tape 4. Tensile modulus (E) of the whole decorative sheet 1 is not more than 400 MPa, and the equation (1) of ä(E<SB>1</SB>×T<SB>1</SB>)/(E<SB>1</SB>×T<SB>1</SB>+E<SB>2</SB>×T<SB>2</SB>)}≤0.5 is satisfied, wherein E<SB>1</SB>and T<SB>1</SB>are tensile modulus and thickness of the application tape 4 respectively, and E<SB>2</SB>and T<SB>2</SB>are tensile modulus and thickness of the decorative film 5 respectively. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a decorative sheet capable of decorating the surface of various objects and a method for attaching the decorative sheet. In particular, the present invention relates to a decorative sheet and a decorative sheet attaching method capable of suppressing the elongation and distortion of the decorative surface when the decorative sheet is attached to a three-dimensional object to be bonded to form a three-dimensional decorative surface.

  Conventionally, when a decorative film is pasted on an adherend, it is manually pasted using a squeegee or the like. In this method, when pasting on a three-dimensional surface such as a curved surface, the pasting can be performed without any problem without wrinkling even if the decorative film is not stretched, but the pasting proceeds. Accordingly, wrinkles are generated, and it was necessary to apply the film while stretching it locally. Therefore, there is a problem that the decorative surface is distorted. Further, there is a problem that it takes time to apply the decorative film by such manual work. In addition, when the decorative film is pasted on the curved surface, the distortion increases as the area increases, so it is difficult to use a decorative film with a large area.

  Further, as another method for attaching the decorative film to the adherend, there is disclosed a method of attaching the decorative film to the adherend while forming the decorative film by reduced pressure molding (see Patent Document 1). In this method, a decorative space and a predetermined vacuum forming apparatus are used to form a closed space, an object to be adhered is mounted in the closed space, and the interior of the closed space is decompressed to attach the decorative film to the object to be adhered. It was to be attached. According to this method, if the adherend and the decorative film are stuck in a state where air is held between them, or if the adherend has a concave portion, the decorative film does not follow the shape of the concave portion. There was a problem that the decorative film did not stick to the concave surface of the concave portion.

Japanese Patent Laid-Open No. 56-113420

  The present invention relates to a decorative sheet that can suppress wrinkles, elongation, and distortion of the decorative surface when the decorative sheet is applied to a three-dimensional object to be bonded to form a three-dimensional decorative surface. Providing a method.

The present invention is a decorative sheet comprising a decorative film and an application tape, the tensile elastic modulus (E) of the entire decorative sheet is 400 MPa or less, and the tensile elastic modulus (E ₁ ) and thickness (T ₁ ) of the application tape. And a decorative sheet in which the relationship between the tensile elastic modulus (E ₂ ) and the thickness (T ₂ ) of the decorative film is represented by the following formula (1).
{(E ₁ × T ₁ ) / (E ₁ × T ₁ + E ₂ × T ₂ )} ≦ 0.5 (1)

The present invention is also a method of attaching a decorative sheet comprising a decorative film and an application tape to an adherend, wherein the tensile elastic modulus (E) of the entire decorative sheet is 400 MPa or less, and the tensile elasticity of the application tape The decorative sheet represented by the following formula (1) is applied and the relationship between the rate (E ₁ ) and thickness (T ₁ ) and the tensile modulus (E ₂ ) and thickness (T ₂ ) of the decorative film is stretched and pasted It provides a pasting method to be pasted on the body.
{(E ₁ × T ₁ ) / (E ₁ × T ₁ + E ₂ × T ₂ )} ≦ 0.5 (1)

  In the present invention, it is preferable that the decorative sheet is stretched and stretched at a stretch ratio smaller than the yield point elongation.

  In the decorative sheet of the present invention, the overall tensile elastic modulus and the thickness and tensile elastic modulus of each of the decorative film and the application tape are in the above-described relationship, and therefore the decorative sheet is attached to a three-dimensional adherend. In this case, it is possible to suppress wrinkles, stretch and distortion of the decorative surface. Moreover, the decorative sheet sticking method of the present invention makes it possible to form a decorative surface with less wrinkles, stretch and distortion using the decorative sheet.

  Next, embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments, and is within the scope of the present invention. Based on this knowledge, it should be understood that design changes, improvements, etc. can be made as appropriate.

  Fig.1 (a) is a typical top view which shows one Embodiment of the decorating sheet of this invention, FIG.1 (b) is the AA cross section which passes along the center 22 of the decorating sheet 1 in Fig.1 (a). FIG. A decorative sheet 1 shown in FIGS. 1A and 1B includes a decorative film 5 and an application tape 4. The decorative film 5 has a decorative surface 51, and the application tape 4 is attached to the decorative film 5 so as to cover the decorative surface 51.

The tensile modulus (E) of the entire decorative sheet 1 is 400 MPa or less. By setting the tensile modulus (E) to 400 MPa or less, preferably 200 MPa or less, and more preferably 100 MPa or less, the decorative sheet 1 is stretched and attached to a three-dimensional object to be bonded, and the decorative surface 51 is three-dimensional. When deforming to a smooth surface, the decorative sheet 1 can flexibly follow the shape of the adherend, and the decorative surface 51 can be prevented from being wrinkled. Although there is no restriction | limiting in the minimum of a tensile elasticity modulus (E), Usually, a 10 MPa or more thing is used. Note that the tensile elastic modulus (E) is obtained by laminating the decorative film 5 and the application tape 4 as shown in FIG. 2 to make a sample sheet 10 having the same size, and this sheet is subjected to the following measurement conditions with a tensile tester. It can be determined by measuring.
Measurement conditions (JIS K7127 / 2/300)
Tensile speed: 300 mm / min
Test piece: Distance between initial chucks = 100 mm, width = 15 mm
Tensile modulus calculation method: In elongation up to 100% elongation, the slope of stress value is calculated at 1% pitch, and the maximum value is taken as tensile modulus (MPa).

Furthermore, in the decorative sheet 1, the tensile elastic modulus (E ₁ ) and thickness (T ₁ ) of the application tape 4 and the tensile elastic modulus (E ₂ ) and thickness (T ₂ ) of the decorative film 5 are expressed by the following formula (1). The relationship represented by is satisfied.
{E ₁ × T ₁ / (E ₁ × T ₁ + E ₂ × T ₂ )} ≦ 0.5 (1)

The value of {(E ₁ × T ₁ ) / (E ₁ × T ₁ + E ₂ × T ₂ )} (hereinafter sometimes referred to as “E-ratio”) is 0.5 or less, preferably 0.4 or less. More preferably, by being 0.3 or less, the elongation of the decorative surface 51 can be suppressed, and the difference between the elongation rate near the center of the decorative surface 51 and the elongation rate near the peripheral portion can be reduced. 51 distortion can be suppressed.

There is no particular limitation on the thickness of the application tape 4 (T _1), with the energy for deforming the thickness (T ₁₎ is too thick increases, which is not preferable changes in the direction E-Ratio increases. On the other hand, if the thickness (T ₁ ) is too thin, it is not preferable because it is easily broken during deformation. The thickness (T ₁ ) is preferably in the range of 30 to 1000 μm, more preferably in the range of 50 to 800 μm, and particularly preferably in the range of 80 to 300 μm.

There is no particular restriction on the tensile modulus (E ₁ ) of the application tape. However, if the tensile modulus (E ₁ ) is too high, it is preferable because energy for deformation increases and E-Ratio increases. Absent. Moreover, since the tensile elasticity modulus (E) of the whole decoration film changes in the direction which becomes large, it is not preferable. On the other hand, if the tensile elastic modulus (E ₁ ) is too low, it is not preferable because it is easily broken during deformation. The tensile modulus (E ₁ ) is preferably in the range of 10 to 1000 MPa, more preferably in the range of 15 to 400 MPa, and particularly preferably in the range of 20 to 200 MPa.

There is no particular limitation on the thickness of the decorative film (T _2), the thickness (T ₂₎ energy for deforming is too thick large undesirably. On the other hand, if the thickness (T ₂ ) is too small, it is not preferable because it easily breaks during deformation and changes in the direction in which E-Ratio increases. The thickness (T ₂ ) is preferably in the range of 10 to 500 μm, more preferably in the range of 15 to 200 μm, and particularly preferably in the range of 20 to 100 μm.

The tensile elastic modulus (E ₂ ) of the decorative film is not particularly limited, but if the tensile elastic modulus (E ₂ ) is too high, the energy required for deformation increases and the tensile elastic modulus (E) of the entire decorative film increases. Since it changes in the direction which becomes large, it is not preferable. On the other hand, if the tensile modulus (E ₂ ) is too low, it tends to be broken at the time of deformation, and the E-Ratio changes in an increasing direction, which is not preferable. The tensile modulus (E ₂ ) is preferably in the range of 10 to 1500 MPa, more preferably in the range of 30 to 1000 MPa, and particularly preferably in the range of 50 to 500 MPa.

The thickness of the entire decorative sheet 1, that is, the value of (T ₁ + T ₂ ) is not particularly limited. However, if the thickness (T ₁ + T ₂ ) is too thick, energy for deformation is increased, which is not preferable. On the other hand, if the thickness (T ₁ + T ₂ ) is too thin, problems such as tearing during deformation are likely to occur, which is not preferable. The thickness (T ₁ + T ₂ ) is preferably in the range of 30 to 1000 μm, more preferably in the range of 50 to 800 μm, and particularly preferably in the range of 100 to 300 μm.

  The yield point elongation (%) in the tensile test of the entire decorative sheet 1 is also preferably large. If the yield point elongation is larger than the stretch ratio (elongation rate) when the decorative sheet 1 is stretched and pasted to the adherend, the decorative sheet is stretched at a stretch ratio within a range that stretches relatively evenly before the yield point. While being pasted on the adherend, it is possible to suppress the distortion of the decorative surface. Accordingly, the yield point elongation (%) of the entire decorative sheet 1 is preferably 20% or more, more preferably 50% or more, and particularly preferably 100% or more. In addition, yield point elongation (%) means the elongation rate until it reaches the yield point in the tensile test under the same conditions as the measurement of the tensile modulus (E).

  As shown in FIG. 3, the decorative film 5 has a base layer 2 and a base layer 2 and a base layer 2 formed of an ink or the like to form a pattern and the like, and a transparent protective layer 9 is formed on the base layer 2. It is preferable to have. Here, the decoration layer 3 constitutes a pattern, a figure, a character, a symbol, a color, a combination thereof, and the like, and may be intermittently or continuously formed on the entire surface of the base material 2 or intermittently on a part of the surface. Or may be formed continuously or continuously.

  Although there is no restriction | limiting in particular in the material which mainly comprises the base material of an application tape and a decoration film, Usually, it is thermoplastic materials, such as resin. Preferable materials mainly constituting the application tape include PVC (vinyl chloride resin), PE (polyethylene), PP (polypropylene), PE (polyethylene) / PP (polypropylene), urethane resin, acrylic resin, ionomer resin, silicon resin, Examples thereof include natural rubber and synthetic rubber. Preferable materials mainly constituting the base of the decorative film include vinyl chloride resin, urethane resin, acrylic resin, olefin resin, ionomer resin, fluororesin, polycarbonate resin and the like.

  The decorative sheet 1 normally includes an adhesive layer 6 between the application tape 4 and the decorative film 5 as shown in FIG. Furthermore, an adhesive layer 7 is provided on the surface of the decorative film 5 opposite to the application tape 4. By setting it as such a form, the decoration sheet 1 can be easily affixed on a to-be-adhered body, and after applying, the application tape 4 can be peeled off and removed easily. Further, a protective liner 8 is usually disposed on the surface of the adhesive layer 7 so that dust or the like does not adhere to the surface of the adhesive layer 7 before use. When the decorative sheet 1 is pasted on the adherend, this liner is removed and used.

  Although there is no restriction | limiting in particular in the adhesive used for the adhesion layer 7, An acrylic adhesive, a rubber adhesive, etc. can be used. Moreover, you may arrange | position a heat sensitive adhesive instead of an adhesive. Although there is no restriction | limiting in particular in the thickness of the adhesion layer 7, 15-30 micrometers is preferable. The pressure-sensitive adhesive used for the pressure-sensitive adhesive layer 6 is preferably one having a lower adhesive strength than the pressure-sensitive adhesive used for the pressure-sensitive adhesive layer 7. For example, an acrylic adhesive, a synthetic rubber adhesive, etc. can be used.

  Moreover, when a decoration sheet is affixed on a to-be-adhered body, it is preferable that the application tape 4 is larger than the decoration film 5, as shown to Fig.1 (a) and (b). With such a configuration, the edge of the application tape 4 can be fixed, and the decorative sheet 1 can be attached to the adherend, which can be easily attached and the elongation of the decorative surface can be suppressed. The ratio (La / Ld) of the length La of the application tape 4 to the length Ld of the decorative film 5 in the cross section of the decorative film as shown in FIG. 1 (b) is preferably 1.05 or more, More preferably, it is 1.1 or more. And the part which becomes such a relationship is preferably 50% or more, more preferably 80% or more, and more preferably 100% of the total area of the decorative sheet (area in the plane parallel to the decorative surface 51). It is particularly preferred.

  Next, a method of attaching the decorative sheet described above to a three-dimensional object to be applied will be described based on a specific example.

  FIGS. 4A to 4D show an example of an attaching method for attaching the decorative sheet 1 to a sphere. As shown in FIG. 4A, the edge of the decorative sheet 1, that is, the edge 15 of the application tape 4 is held by the clip 16, and the spherical adherend 19 is brought into contact with the decorative film 5. At this time, it is preferable to grip almost the entire circumference of the decorative sheet 1 by the clip 16. Then, as shown in FIGS. 4B and 4C, the decorative sheet 1 and / or the adherend body 19 is moved in a state where tension is applied to the decorative sheet 1, and the decorative film 5 is curved on the adherend body 19. Paste along the shape. In this way, the decorative surface can be curved while the decorative sheet 1 is stretched by the method of sticking the decorative film 5 to the adherend 19 while holding the edge 15 and applying a predetermined range of tension. And by using the decorative sheet 1 described above, it is possible to form a decorative surface with little elongation or distortion. Finally, by peeling off and removing the application tape 4, a three-dimensional decorative surface 51 along the adherend 19 can be formed as shown in FIG. In addition, it can be set as the decoration surface where elongation and distortion are smaller by sticking the decoration sheet 1 to a to-be-adhered body so that it may become a draw ratio smaller than the yield point elongation of the decoration sheet 1. FIG.

  Another method for stretching the decorative sheet to form a three-dimensional decorative surface is a reduced pressure or pressure molding method using a mold. For example, as shown in FIG. 5, the decorative sheet 1 is set on the mold 17, and a three-dimensional decorative surface is formed by pressurizing or depressurizing the decorative sheet 1 so as to deform along the surface 18 of the mold 17. Can do. Thereafter, the decorative sheet 1 can be attached to the adherend by putting the adherend into the mold. In addition, there is no restriction | limiting in particular in the shape of a to-be-adhered body, A convex shape, a concave shape, or the shape which combined these may be sufficient.

  EXAMPLES Hereinafter, although this invention is demonstrated further in detail based on an Example, this invention is not limited to these Examples.

(Evaluation methods)
A concave mold 11 having a radius of curvature of 110 mm and a depth (D) of 75 mm shown in FIG. 6 is used as an adherend, and the grip width (X) on the cross section passing through the center of the mold 11 is 200 mm. The elongation percentage of the entire decorative surface ("Elongation" in Table 2) and (Elongation ratio of peripheral part) / (Elongation ratio of central part) ("Distortion" in Table 2) ) And the presence or absence of wrinkles was observed. The percentage of elongation at the periphery of the decorative surface and the percentage of elongation at the center are printed on a line passing through the center of the decorative film at predetermined intervals. Obtained from change. Further, the draw ratio in this evaluation is obtained by dividing the difference between the grip width (X) in the cross section shown in FIG. 6 and the length after the width portion is stretched along the mold by the grip width (X). 34% from the following equation (2).
(Length after stretching-grip width) / grip width × 100 =
(268 mm−200 mm) / 200 mm × 100 = 34 (%) (2)

(Examples 1-6 and Comparative Examples 1-10)
As the film for the base material of the application tape and the decorative film, the film shown in Table 1 was used in the combination shown in Table 2 to obtain a decorative sheet. The obtained decorative sheet was evaluated by the above-described evaluation method. In Comparative Examples 7 to 10, a scale is printed on a single-layer film having a width of 160 mm and evaluated. The evaluation results are shown in Table 2. In Table 2, the case where wrinkles were observed was marked with ×, and the case where wrinkles were not observed was marked with ○.

  From Table 1, since the decorative sheets of Examples 1 to 6 have a small E-Ratio and a low tensile elastic modulus (E), the elongation (elongation) of the entire decorative surface is small, distortion is small, and wrinkles are also observed. A good decorative surface after pasting that was not observed and was close to the decorative surface before pasting could be obtained. In the decorative sheets of Comparative Examples 1 to 4, since the tensile elastic modulus (E) was too large, wrinkles were generated on the decorative surface, and the decorative sheet could not be successfully attached to the curved surface of the adherend. Therefore, it was not possible to measure elongation and distortion. Since the decorative sheet of Comparative Example 5 had an E-Ratio that was too large, the elongation and distortion were too large. The decorative sheet of Comparative Example 6 also had too large E-Ratio, and could not be successfully attached to the curved surface of the adherend. Since the decorative sheets of Comparative Examples 7 to 10 were single layers, the elongation was too large.

  The decorative sheet and the decorative sheet attaching method of the present invention suppress the wrinkles, elongation, and distortion of the decorative surface when the decorative sheet is applied to a three-dimensional object to be bonded to form a three-dimensional decorative surface. Therefore, it can be used in various fields where a three-dimensional decorative surface is desired.

Fig.1 (a) is a typical top view which shows one Embodiment of the decorating sheet of this invention, FIG.1 (b) is AA sectional drawing which passes along the center 22 of the decorating sheet in Fig.1 (a). It is. It is typical sectional drawing which shows the form at the time of testing the decoration sheet of this invention with a tensile tester. It is typical sectional drawing which shows another embodiment of the decorating sheet of this invention. FIGS. 4A to 4D are schematic process diagrams showing an embodiment of the decorative sheet attaching method of the present invention. It is a schematic diagram which shows another embodiment of the sticking method of the decoration sheet | seat of this invention. It is typical sectional drawing which shows the evaluation method in an Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Decorative sheet, 2 ... Base material, 3 ... Decorative layer, 4 ... Application tape, 5 ... Decorative film, 6, 7 ... Adhesive layer, 8 ... Liner, 9 ... Protective layer, 10 ... Sample sheet, 11 ... Mold, DESCRIPTION OF SYMBOLS 15 ... Edge of (application tape), 16 ... Clip, 17 ... Type | mold, 18 ... (Type | mold) surface, 19 ... To-be-adhered body, 22 ... Center of a decoration sheet, 51 ... Decoration surface.

Claims (3)

A decorative sheet comprising a decorative film and an application tape, wherein the tensile elastic modulus (E) of the entire decorative sheet is 400 MPa or less, the tensile elastic modulus (E ₁ ) and thickness (T ₁ ) of the application tape, and the decorative film A decorative sheet whose relationship with the tensile modulus (E ₂ ) and thickness (T ₂ ) is represented by the following formula (1).
{(E ₁ × T ₁ ) / (E ₁ × T ₁ + E ₂ × T ₂ )} ≦ 0.5 (1) A method of attaching a decorative sheet comprising a decorative film and an application tape to an adherend, wherein the tensile elastic modulus (E) of the entire decorative sheet is 400 MPa or less, and the tensile elastic modulus (E ₁ ) of the application tape and thickness (T ₁₎ and the tensile modulus of the decorative film (E ₂₎ and the thickness (T ₂₎ the relationship between the by stretching a decorative sheet represented by the following formula (1) stuck to an adhered member step To paste decorative sheets containing
{(E ₁ × T ₁ ) / (E ₁ × T ₁ + E ₂ × T ₂ )} ≦ 0.5 (1)   The method for adhering a decorative sheet according to claim 2, wherein the decorative sheet is stretched at a stretch ratio smaller than the yield point elongation of the decorative sheet and is pasted on the adherend.

Images