JP2013132828A - Transfer film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily form a fine rugged shape on a product surface.SOLUTION: The transfer film 100 includes: a substrate film 1 on the surface of which a predetermined concave pattern 6 is formed; a first decorative layer 8 formed inside the substrate film along the concave pattern of the substrate film 1; a separation layer 2 provided to the lower layer of the substrate film 1; a second decorative layer 3 formed on the lower layer of the separation layer 2 by inkjet printing or the like; and an adhesive layer 4 provided to the lower layer of the second decorative layer 3. With a transfer layer 5 being temporarily cured, the transfer film 100 is adhered to the curved surface of a product, and the transfer layer 5 is radiated with ultraviolet rays to be completely cured, causing the substrate film 1 to be separated. Thereby even a fine rugged shape can be easily formed on the surface of a product. Furthermore the first decorative layer 8 appears directly as a convex pattern 7 on the surface of the separation layer 2, with enhanced decoration property.

Description

  The present invention relates to a transfer film for performing decoration by transferring a film to the surface of a product.

  Conventionally, an IMD (In-Mold Decoration) technique for decorating a material by attaching a printed film is known. FIG. 9 is an explanatory diagram showing a decoration method by IMD disclosed in Patent Document 1. In FIG. In this decoration method, a decorative layer 502 using an ultraviolet curable ink is laminated on a transparent synthetic resin film 501, and a white pressing layer 503 and a binder layer 504 are further laminated. Then, the transfer film 500 is thermocompression bonded to the surface of the resin molded body as the product S through the binder layer 504.

JP 2008-272946 A

In recent years, there has been a demand for further decorating properties for products decorated with IMD technology, and for example, decorating that forms irregularities on the surface of a film has been proposed. However, when forming irregularities on the surface of the film by ink jet printing, there is a problem that it is extremely difficult to form fine irregularities.

Then, the objective of this invention is providing the film for transfer which can form fine uneven | corrugated shape on the film surface easily, and can improve decorating property.

  The transfer film according to the present invention is a transfer film provided with a transfer layer for decorating the product surface on the surface of the base film, and a recess in the thickness direction is formed on the surface of the base film. A first decorative layer is formed in the interior along the recess.

When the transfer film is attached to the surface of the product and the base film is peeled off from the transfer layer along the interface, convex portions corresponding to the concave portions of the base film are transferred to the surface of the transfer layer. And the 1st decoration layer formed inside along the recessed part appears on the surface of a transfer layer as the said convex part. Thereby, the convex-shaped decoration can be easily given to the product surface. Moreover, the said base film can be reused after peeling. The 1st decoration layer also includes the case where it is provided in a part of inside of a recessed part. Further, the releasability of the base film is formed by a material having high releasability with respect to an ultraviolet curable resin or a thermosetting resin that can be a material of the transfer layer, or releasability from the transfer layer. It is realized by applying surface modification to improve the surface. Moreover, when giving releasability to a transfer layer, it is possible to form a transfer layer with a material having high releasability with respect to the material of the base film or to improve releasability with the base film. This is realized by applying surface modification to the surface of the transfer layer.

The transfer layer may be composed of a release layer that also serves as a hard coat layer and an ink-jet decorative layer, or may be composed of only a colorless or colored release layer, or an ink-jet decorative layer. It may consist only of.

In the transfer film according to the present invention, the base film further has a releasability that can be peeled along the interface with the transfer layer, and the transfer layer includes a release layer for the base film. In addition, it is preferable that the release layer and the first decorative layer are bonded.

In addition to the substrate film having releasability, the substrate film can be peeled cleanly at the interface between the substrate film and the release layer by providing a release layer in the transfer layer, and the first decorative layer By bonding to the release layer, the first decorative layer is also reliably peeled from the base film together with the release layer. Thereby, since the recessed part shape of a base film is transcribe | transferred neatly as expected, the decorating property of a product improves more. Bonding between the first decorative layer and the release layer depends on whether they are chemically bonded by the same or similar material or physically bonded at the interface.

In the transfer film according to the present invention, it is preferable that the transfer layer has a second decorative layer on which a printing composed of a shape, a pattern, a color, or a combination thereof is applied below the release layer.

  According to the structure which concerns, decoration property can further be improved by the synergistic effect of the 1st decoration layer formed in the recessed part, and the said 2nd decoration layer.

In the transfer film according to the present invention, the transfer layer can be peeled along the interface with the base film, and is printed with a shape, a pattern, a color, or a combination thereof. It is preferable that the decorative layer is formed by bonding to the lower layer of the first decorative layer.

  That is, by forming the transfer layer with the second decorative layer, the decorating property can be further improved by the synergistic effect of the first decorative layer and the second decorative layer. In addition, since the second decorative layer is made peelable while being bonded to the first decorative layer, the concave shape of the base film is transferred cleanly as expected when the base film is peeled off. , The decorativeness of the product is further improved. Bonding between the first decorative layer and the release layer depends on whether they are chemically bonded by the same or similar material or physically bonded at the interface.

In the transfer film according to the present invention, it is preferable that a register mark formed by a concave portion is provided outside the decorative region of the base film.

  When forming a 1st decoration layer with an inkjet along the recessed part of a base film, it is necessary to recognize the position on the said base film of the said recessed part with an inkjet printer. For this reason, when forming a recessed part in a base film, the recessed part used as a register mark is formed, and after positioning with this register mark, inkjet printing is performed to the recessed part of a decoration area | region. Thereby, a 1st decoration layer can be formed in the inside along a recessed part.

In the transfer film according to the present invention, it is preferable that the first decorative layer is formed thicker than the depth of the recess, and the release layer is formed around a protruding portion protruding from the base film.

  By forming the release layer around the protruding portion, the contact area between the first decorative layer and the release layer is increased, and the first decorative layer is difficult to be removed from the release layer. Thereby, the decorating effect can be maintained over a long period of time.

  According to the present invention, high decorativeness can be imparted to the surface of the product, and a fine uneven shape can be efficiently formed. Moreover, since a 1st decorating layer appears as a convex pattern on the surface of a product, a higher decorating effect is acquired.

It is sectional drawing which shows the structure of the film for transfer which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows an example of the manufacturing method of a base film. It is explanatory drawing which shows an example of the formation method of the register mark of a base film. It is a top view which shows the base film in which the register mark was formed. It is explanatory drawing which shows the modification of a base film. It is sectional drawing which shows the modification of the film for transfer. It is sectional drawing which shows the film for transfer which concerns on Embodiment 2 of this invention. It is sectional drawing which shows the film for transfer which concerns on Embodiment 3 of this invention. It is explanatory drawing which shows an example of the decorating method by the conventional IMD.

(Embodiment 1)
FIG. 1 is a cross-sectional view showing the structure of a transfer film according to Embodiment 1 of the present invention, where (a) shows a state before peeling of a base film, and (b) shows that a transfer film is attached to a product surface. The state which attached and peeled the base film is shown. This transfer film 100 is formed on the inside of the base film 1 having a predetermined concave pattern 6 formed on the surface thereof, along the concave pattern 6 of the base film 1 and is hard coated (protected) after the main curing. A first decorative layer 8 having a function as a part of the layer), a release layer 2 provided as a lower layer of the base film 1 and functioning as a hard coat layer after the main curing, and a lower layer of the release layer 2 It consists of the 2nd decoration layer 3 formed by the inkjet printing etc., and the contact bonding layer 4 provided in the lower layer of the 2nd decoration layer 3. FIG. Since the first decorative layer 8, the release layer 2, and the second decorative layer 3 are attached to the product S via the adhesive layer 4 and decorated with the convex pattern 7, the first decorative layer is formed. The decorative layer 8, the release layer 2, and the second decorative layer 3 are referred to as a transfer layer 5.

The base film 1 is made of an olefin-based resin having high peelability (details will be described later), and the concave pattern 6 on the surface thereof is formed in the thickness direction of the base film 1. The concave pattern 6 includes a rectangular cross section, an inverted trapezoid, and the like.

  The first decorative layer 8 is formed inside the concave pattern 6 along the concave pattern 6 by inkjet using an ultraviolet curable ink. In this ink jet printing, the register film 56 (see FIG. 4) provided on the base film 1 is used to position the base film 1 with respect to the ink head (not shown), and then precisely at the position where the concave pattern 6 is formed. Apply ink to The register mark 56 is detected by a sensor provided in the ink jet printer that forms the first decorative layer 8. The control device of the ink jet printer holds the position information of the concave pattern 6 and the register mark 56. The control device specifies the position of the register mark 56 from the output signal of the sensor, and positions the concave pattern 6 with respect to the ink head based on the position information. Then, ink is applied to the inside of the predetermined concave pattern 6 based on the position information held.

By using an ink mainly composed of isobornyl acrylate (about 50% by weight), tetrahydrofurfuryl acrylate (about 20% by weight) modified amine acrylate oligomer (about 10 to 25% by weight), Tensile elongation can be obtained. The 1st decoration layer 8 performs the ultraviolet irradiation by LED at low energy at the time of the printing by an inkjet printer, and hardens the ink. In addition, you may harden by natural drying. In the cured state, the tensile elongation of the ink is about 100%. In addition, this 1st decoration layer 8 can also omit provisional hardening by the adhesiveness with the empty peeling layer 2, and the peelability with the base film 1. FIG.

  For the release layer 2, a transparent ultraviolet curable (UV curable) resin material is used. In particular, when the hard coat layer is also used, an acrylate resin is used. Specifically, it is preferable to use a polymer acrylate as the main component. The polymer acrylate can be temporarily cured by heating at 70 ° C. for 5 minutes with a dryer, and the tensile elongation (JIS K7127) at that time is about 50%. In addition, you may make it harden | cure by natural drying. The hardness at the time of temporary curing is about F in pencil hardness (JIS K 5600-5-4 paint general test method, mechanical properties of coating film, scratch hardness (pencil method)). That is, since the polymer type acrylate has a pencil hardness of about F even in the pre-cured state, the polymer type acrylate has a high peelability with respect to the base film 1 and has a high tensile elongation. Extensibility can be increased.

The main curing of the release layer 2 with ultraviolet rays is performed with a high-pressure mercury lamp (80 W / cm) under an energy condition of 500 mJ / cm ² . The main wavelength of the high-pressure mercury lamp is 365 nm, and the wavelength components of 254 nm, 313 nm, 405 nm, and 436 nm are strong, which is suitable for curing the release layer 2 made of polymer type acrylate.

As another material of the release layer 2, urethane acrylate can be used. Examples of other acrylate resins include urethane methacrylate, bisphenol A, bisphenol F, bisphenol AD, water-added bisphenol A, dimer acid-modified epoxy acrylate or epoxy methacrylate, polyester, and the like. It is also possible to use a system acrylate, a polyester system methacrylate, a silicone system acrylate, a silicone system methacrylate, an alkyd system acrylate, an alkyd system methacrylate, or the like.

  The release layer 2 is formed by a coater, gravure printing, screen printing, ink jet, or the like. The thickness of the release layer 2 is about 10 μm to 50 μm in the state including the binder, and 5 μm to 15 μm in the state after drying.

In the above description, the release layer 2 is temporarily cured. However, depending on the viscosity and material of the release layer 2, high extensibility can be maintained without being temporarily cured. In such a case, the temporary curing step can be omitted, and the material of the release layer 2 can be used as the release layer 2 before curing while being printed or applied. Furthermore, if the decorative printing layer 3 is laminated and formed on the peeling layer 2, the peeling layer 2 is held between the base film 1 and the decorative printing layer 3, so that the transfer can be performed without temporary curing. Easy to handle film.

  The second decorative layer 3 is composed of a printed drawing layer drawn by inkjet using ultraviolet curable ink and a white pressing layer obtained by inkjet printing white toner for increasing the saturation of the printed drawing layer. The 2nd decoration layer 3 is formed with the desired printing content which consists of a shape, a pattern, a color, or those combinations. By using an ink mainly composed of isobornyl acrylate (about 50% by weight), tetrahydrofurfuryl acrylate (about 20% by weight) modified amine acrylate oligomer (about 10 to 25% by weight), Tensile elongation can be obtained. 5-40 micrometers is preferable and, as for the thickness of the 2nd decoration layer 3, 20-30 micrometers is more preferable.

Note that the second decorative layer 3 may be formed by using a screen printing method, a gravure printing method, a pad printing method, an offset printing method, a thermal transfer printing method, or the like in addition to the inkjet. Note that the white pressing layer can be omitted depending on the contents of the print design. The white pressing layer may be formed by screen printing or may be formed by laminating a white resin layer. The second decorative layer 3 cures ink by performing ultraviolet irradiation with LEDs with low energy during printing by an ink jet printer. It may be cured by natural drying. In the temporarily cured state, the tensile elongation of the ink is about 100%. Depending on the material and viscosity used for the decorative printing layer 3, it may not be cured at this time, and may be cured by being irradiated with ultraviolet rays under the above conditions after being attached to the product S.

For the adhesive layer 4, for example, a material whose main component is cyclohexanone is used. In addition, resins such as acrylic resin, vinyl chloride resin, vinyl acetate resin, polyester resin, and polyamide resin can be used. The thickness of the adhesive layer 4 varies depending on the type of resin of the product S to be attached, but is generally about 5 to 30 μm.

  As shown in FIG. 1B, the transfer film 100 is attached to the surface of the product S via the adhesive layer 4, and then the base film 1 is peeled off from the release layer 2, and the transfer layer 5 is removed. The surface of the product S is decorated by curing. Since the convex pattern 7 corresponding to the concave pattern 6 of the base film 1 is formed on the transfer layer 5, the decoration having the desired convex pattern 7 on the surface of the product S by peeling the base film 1. It can be performed. Furthermore, since the transferred convex pattern 7 is formed by the first decorative layer 8, it is possible to perform a higher level of decoration such as the convex pattern 7 itself being colored independently.

Affixing to the product S is performed by, for example, an IML (In-Mold Lamination) technique. In the IML, the transfer film 100 is placed in a predetermined mold, and the transfer film 100 is attached to the surface of the product S with the mold closed. In addition to the IML, a roll type or up-down type thermal transfer, vacuum press transfer, or the like may be used for attaching the transfer film 100.

  In particular, when the transfer film 100 according to the present invention is attached to the curved portion (or corner portion) of the product S, the base film 1 itself has extensibility and the transfer layer 5 is highly stretched in a temporarily cured state. Therefore, the transfer film 100 has high flexibility as a whole. In other words, since the transfer layer 5 has higher extensibility than the base film 1, the transfer film 100 follows the deformation and elongation of the base film 1, and moves the transfer film 100 along the curved portion (or corner portion) of the product S. Can be pasted without difficulty.

And after peeling off the base film 1, the transfer layer 5 is irradiated with ultraviolet rays having a specific wavelength to be fully cured. The 1st decoration layer 8 and the peeling layer 2 function as a hard-coat layer by this hardening. The hardness of the release layer 2 during main curing is H to 2H in pencil hardness (JIS K 5600-5-4 paint general test method, mechanical properties of coating film, scratch hardness (pencil method)). An LED, a mercury lamp, a metal halide lamp, or the like is used for ultraviolet irradiation.

If necessary, finish curing may be performed by irradiating the first decorative layer 8 and the second decorative layer 3 with ultraviolet irradiation around 380 nm which is the main wavelength. In this case, the altitudes of the first decorative layer 8 and the second decorative layer 3 are improved to F to H by pencil hardness.

  Moreover, since the base film 1 has extensibility, the peelability from the transfer layer 5 is good, and it can be reused after peeling. In addition, when reusing the base film 1, it is preferable to remove dust or the like attached to the surface with a cleaner or the like.

  Further, the release layer 2 may be fully cured before the base film 1 is peeled off. The base film 1 is made of PE or PP and has a thickness of about 50 μm to 150 μm, so that it sufficiently transmits ultraviolet rays. For this reason, an ultraviolet-ray can be irradiated from on the base film 1. Moreover, since the 1st decoration layer 8 and the peeling layer 2 couple | bond together firmly by this hardening, when peeling the base film 1 from the transfer layer 5, it is beautiful from the interface of the transfer layer 5 and the base film 1 Peel off. In other words, since the first decorative layer 8 does not remain attached to the inside of the concave pattern 6, the convex pattern 7 as intended can be formed.

(Manufacturing method of base film)
Drawing 2 is an explanatory view showing an example of a manufacturing method of a substrate film. First, as shown in FIG. 2A, a convex pattern 52 to be formed on the surface of the release layer 2 is formed on the surface of a metal roller 51.

  Subsequently, as shown in FIG. 2B, the material 54 of the base film 1 is applied on the table 53 with high flatness. The base film 1 is made of an olefin resin having high releasability. For example, polypropylene resin (PP resin), polyethylene resin (PE resin), ethylene vinyl acetate copolymer resin (EVA resin), polyolefin soft resin (TPO resin), polyethylene terephthalate resin (PET resin), polycarbonate resin (PC resin) Etc. Among these olefin-based resins, it has been found that a polypropylene resin (PP resin) and a polyethylene resin (PE resin) have the most preferable releasability as the base film 1 based on the trial research by the inventors. In addition, 50-250 micrometers is preferable and the thickness of the said base film 1 has more preferable 100-180 micrometers.

  Next, as shown in FIG. 2 (c), the roller 51 is rolled on the material 54 of the base film 1 coated on the table 53, and the convex pattern 52 on the roller surface is used as the concave pattern 6 of the base film 1. Transcript. Thereby, the predetermined concave pattern 6 is formed on the surface of the base film 1 as shown in FIG. Subsequently, the base film 1 on which the concave pattern 6 is formed is cross-linked and removed from the table 53 to obtain a base film 1 having a predetermined concave pattern 6 as shown in FIG.

  FIG. 3 is an explanatory view showing an example of a method for forming a register mark of a base film. When forming a registration mark on the base film 1, as shown in FIG. 3A, a convex pattern 55 for forming a registration mark 56 is provided on the surface of the roller 51. Then, as shown in FIG. 3B, this roller 51 is pressed against the material 54 of the base film 1 while being rotated (simultaneously in the transfer step in FIG. 2C), and FIG. As shown in FIG. 5, the image is transferred as a register mark 56 of the base film 1. Subsequently, the base film 1 is cross-linked and removed from the table 53 to obtain a base film 1 having a register mark 56 having a predetermined shape as shown in FIG. 3D (in the step shown in FIG. 2E above). Equivalent to).

  FIG. 4 is a plan view showing a base film on which a register mark is formed. The base film 1 has a decoration region 70 in which the concave pattern 6 in which the first decoration layer 8 is to be formed, and registration marks 56 are formed at the four corners outside the decoration region 70. Is done. As described above, the ink jet printer specifies the position of the concave pattern 6 from the detection signal of the register mark 56 by the sensor, and applies ink along the concave pattern 6.

  The register mark 56 is, for example, a quadrangle. The rectangular inner side of the register mark 56 may be a mat surface or a pear surface. Since the register mark 56 is only formed as a recess, it is difficult to read by the sensor. Therefore, by forming minute irregularities on the surface of the convex pattern 55 of the roller 51 and forming a mat surface or pear ground, Change the reflectance. Thereby, the register mark 56 is easily read by the sensor. The shape of the register mark 56 is not limited to a quadrangle. Although the base film 1 is manufactured as described above, the manufacturing method of the base film 1 is not limited to this.

  As shown in FIG. 5, a release layer 61 may be formed on the surface of the base film 1. In particular, it is effective when a polyethylene terephthalate resin (PET resin) or a polycarbonate resin (PC resin) having a slightly inferior moldability is used. When another material having releasability is laminated, the concave pattern 6 is buried, so that the release layer 61 is preferably provided as a surface modification layer by a laser or the like.

  Since the transfer layer 5 has high extensibility of about 1.5 to 2.0 times in the plane direction before the main curing, the elongation of the entire transfer film depends on the elongation of the base film 1. Become. As above-mentioned, since the base film 1 is a material with suitable PP resin or PE resin, and the thickness is about 140 micrometers, it can anticipate the tensile elongation of 20-30%. For this reason, since the high extensibility is obtained as the whole transfer film, it can be naturally attached to the curved surface or corner portion of the product S.

  According to the transfer film 100 described above, since the convex pattern 7 is formed on the surface of the release layer 2 along the concave pattern 6 of the base film 1, the convex pattern 7 can be expressed easily. Thereby, a high level of decoration can be performed on the surface of the product S. Furthermore, since the convex pattern 7 itself is formed as the first decorative layer 8, a higher level of decoration can be achieved by coloring only the convex pattern 8 or the like. In addition, since the transfer film 100 has high extensibility, it can be naturally attached to a curved portion or a corner portion of the product S. Moreover, since the base film 1 can be reused, the production efficiency of the transfer film 100 is improved.

  Moreover, you may make it form a 1st decorating layer only in a part of specific concave pattern 6 (illustration omitted). In other portions, the peeling layer 2 enters the concave pattern 6 to form the convex pattern 7.

  Further, as shown in FIG. 6, the transfer layer 62 may be formed by omitting the second decorative layer 3 and coloring the release layer 2. Thereby, the decoration by coloring and the convex pattern 7 on the surface of the peeling layer 2 is attained. As the colorant in this case, a metallic pigment made of a scale-like foil powder of a metal, an alloy, or a metal compound such as aluminum, chromium, nickel, tin, titanium, iron phosphide, copper, gold, silver, or brass, mica-like Pearlescent pigment made of foil powder such as iron oxide, titanium dioxide coated mica, titanium dioxide coated bismuth oxychloride, bismuth oxychloride, titanium dioxide coated talc, fish scale foil, colored titanium dioxide coated mica, basic lead carbonate, Fluorescent pigments such as strontium aluminate, calcium aluminate, barium aluminate, zinc sulfide, calcium sulfide, white inorganic pigments such as titanium dioxide, zinc white, antimony trioxide, zinc white, petal, vermilion, ultramarine blue, cobalt blue, Inorganic pigments such as titanium yellow, yellow lead, carbon black, isoindolinone yellow, Hansa Yellow A Quinacridone red, it Permanent Red 4R, phthalocyanine blue, be mixed Indanthrene Blue RS, (including dyes) organic pigments such as aniline black 1 or 2 or more.

(Embodiment 2)
FIG. 7 is a sectional view showing a transfer film according to Embodiment 2 of the present invention. This transfer film 200 has a configuration in which the release layer 2 of the transfer film 100 described in Embodiment 1 is omitted. The first decorative layer 8 and the second decorative layer 203 as the transfer layer 205 are directly formed on the base film 1. The method for forming the first decorative layer 8 is as in the first embodiment.

The second decorative layer 203 includes a print drawing layer 231 drawn by inkjet using ultraviolet curable ink (the same UV ink as in the first embodiment), and white toner for increasing the saturation of the print drawing layer 231. It consists of a white pressing layer 232 printed by inkjet. The second decorative layer 203 may be formed using a screen printing method, a gravure printing method, a pad printing method, an offset printing method, a thermal transfer printing method, or the like, in addition to the inkjet. The white pressing layer may be formed by screen printing. The white pressing layer 232 may be a pressing layer made of UV clear ink or colored ink.

After forming the 2nd decoration layer 203 on the base film 1, it hardens | cures by irradiating an ultraviolet-ray with LED incorporated in an inkjet printer. The hardness of the ink after curing is about F in pencil hardness. Note that, depending on the material and viscosity used for the second decorative layer 203, it may not be cured at this point, and may be cured by being irradiated with ultraviolet rays under the above conditions after being attached to the product S.

The adhesive layer 4 similar to that of the first embodiment is provided below the cured second decorative layer 203. Then, the transfer film 200 is attached to the surface of the product S. Since the first decorative layer 8 and the second decorative layer 203 extend about 100% in the cured state, the first decorative layer 8 and the second decorative layer 203 are deformed by flexibly following the deformation of the base film 1 when the base film 1 is attached. For this reason, it can be naturally attached to the curved surface of the product S or the like.

  Then, the base film 1 is peeled from the first decorative layer 8 and the second decorative layer 203. Since the base film 1 made of PP or PE has high releasability by itself, the base film 1 is peeled cleanly from the first decorative layer 8 and the second decorative layer 203. Moreover, since the 1st decoration layer 8 and the 2nd decoration layer 203 are printed with the same UV ink, it couple | bonds firmly by hardening. For this reason, when peeling the base film 1 from the transfer layer 205, it peels cleanly from the interface between the transfer layer 205 and the base film 1. In other words, the first decorative layer 8 does not remain attached inside the concave pattern 6. Thereby, the convex pattern 7 as expected can be formed on the surface of the second decorative layer 203. Furthermore, since the 1st decoration layer 8 and the 2nd decoration layer 203 are laminated | stacked directly, high decorating property is acquired. In addition, this first cured first decorative layer 8 and second decorative layer 203 also function as a hard coat layer on the surface of the product S.

  According to the transfer film 200 having the above configuration, the release layer 2 can be omitted, so that the manufacturing process is simplified and the cost of the product S can be suppressed.

(Embodiment 3)
FIG. 8 is a cross-sectional view showing a part of a transfer film according to Embodiment 3 of the present invention. In this transfer film, the first decorative layer 8 is made thicker than the depth of the concave pattern 6 in the configuration of the first embodiment, and is raised from the surface of the concave pattern 6 of the base film 1. In this state, the release layer 2 is formed in the lower layer of the first decorative layer 8, and the periphery of the protruding portion 9 that protrudes and protrudes from the first decorative layer 8 is restrained by the release layer 2. In other words, the protruding portion 9 acts as an anchor for the release layer 2, increases the contact area between the release layer 2 and the first decorative layer 8, and the first decorative layer 8 is difficult to be removed from the release layer 2. To do.

  In this way, it is possible to prevent the first decorative layer 8 from being removed from the interface with the release layer 2 when the base film 1 is released from the release layer 2. Moreover, since it becomes difficult to remove the 1st decorating layer 8 after transcription | transfer to a product, a decorating effect can be hold | maintained for a long period of time.

The invention can also be specified from the above-described embodiment as follows.
The transfer film according to the first invention is a transfer film provided with a transfer layer for decorating the product surface on the surface of the base film, wherein the base film is along the interface with the transfer layer. It has a releasable releasability and has unevenness in the thickness direction on its surface, and the transfer layer is made of a resin having a higher extensibility than the base film.

When the transfer film is attached to the surface of the product and the base film is peeled from the transfer layer along the interface, the unevenness corresponding to the unevenness of the base film is transferred to the surface of the transfer layer. Thereby, uneven | corrugated shaped decoration can be easily given to the product surface. Further, since the transfer layer has higher extensibility than the base film, it is deformed following the deformation and elongation of the transfer film when it is attached to a product. For this reason, even if it is a product which has a curved surface, since the film for transfer can be reliably affixed, a beautiful decoration can be performed. Moreover, since the said base film can be reused after peeling, the expensive base film which has a micro uneven | corrugated shape can be used effectively. The transfer layer may be composed of a combination of a release layer that also serves as a hard coat layer and a decorative printing layer by inkjet, or may be composed of only a colorless or colored release layer, or by inkjet. You may be comprised only from a decoration printing layer. In addition, the base film is formed of a material that has high releasability with respect to an ultraviolet curable resin or a thermosetting resin, or is subjected to surface modification that can improve releasability.

The transfer film according to a second invention is the transfer film according to the first invention, wherein the transfer layer further comprises a release layer that can be peeled along an interface with the base film, and a layer provided below the release layer. It is characterized by comprising a decorative layer.

  By providing the release layer, the base film can be cleanly peeled at the interface between the base film and the release layer. For this reason, the uneven | corrugated shape of a base film is transferred neatly as expected. Moreover, the decoration layer under the peeling layer can be seen through the peeling layer. For this reason, the decorating property of a product improves more.

The transfer film according to a third invention is characterized in that, in the first or second invention, the transfer layer is in a temporarily cured state.

  Since the temporarily cured resin has higher extensibility than the main cured state, as a result, the extensibility of the entire transfer film is improved. If the transfer film is affixed to the surface of the product before the transfer layer is fully cured, the transfer film is flexibly deformed and reliably affixed even if the product has a curved surface. After pasting, after the transfer layer is fully cured, the substrate film is peeled off, thereby realizing a beautiful decoration with irregular shapes.

The transfer film according to a fourth invention is characterized in that, in any one of the first to third inventions, the base film is made of an olefin resin.

  That is, high releasability can be obtained by forming the base film itself from an olefin resin. For this reason, the peelability from the transfer layer is enhanced, and the uneven shape of the substrate film is transferred cleanly as expected.

The base film of the transfer film according to the fifth invention is a base film that forms a transfer layer that decorates the product surface, and the base film can be peeled along the interface with the transfer layer. It has a good mold release property and has unevenness in the thickness direction formed on the surface thereof.

100 Transfer Film 1 Base Film 2 Peeling Layer 3 Second Decorating Layer 4 Adhesive Layer 5 Transfer Layer 6 Concave Pattern 7 Convex Pattern 8 First Decorating Layer S Product

Claims (6)

A transfer film provided with a transfer layer for decorating the product surface on the surface of the base film,
A transfer film, wherein a recess in the thickness direction is formed on the surface of the base film, and a first decorative layer is formed inside the recess along the recess. Further, the base film has a release property that can be peeled along the interface with the transfer layer, and the transfer layer includes a release layer for the base film, and the release layer and the first layer. The transfer film according to claim 1, wherein the decorative layer is bonded. The transfer film according to claim 2, wherein the transfer layer has a second decorative layer on which a printing composed of a shape, a pattern, a color, or a combination thereof is applied below the release layer.   Further, the transfer layer may be peeled along the interface with the base film, and the second decorative layer on which the printing made of a shape, a pattern, a color, or a combination thereof is applied is the first decorative layer. The transfer film according to claim 1, wherein the transfer film is bonded to a lower layer of the layer.   Furthermore, the registration mark formed in the recessed part is provided in the outer side of the decorating area | region of the said base film, The film for transfer as described in any one of Claims 1-4 characterized by the above-mentioned. The said 1st decorating layer is formed thicker than the depth of a recessed part, and the said peeling layer is formed in the circumference | surroundings of the protrusion part which protruded from the base film. The transfer film described in 1.

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