JP2019059181A - Release sheet - Google Patents

Abstract

To provide a release sheet capable of manufacturing a print material in which a printed material have a surface image and a printed material having a backside image are accurately laminated.SOLUTION: In a release sheet, a support part and a release part are integrated. The release part is peelable from the support part. The release part has a laminate structure in which, from the support part side, a base material for a release part and an image formation part are laminated in this order. A coefficient of static friction measured according to JIS-P-8147(2010) between faces of the release part located at an interface side with the support part is regulated to be 0.25 or less.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a release sheet.

  A print having an image on both sides is not only for photo applications such as photo books but also for games such as toys and trading cards because of its high decorativeness and the large amount of information that can be installed on print objects. And so on, there are various applications. As a method of producing a printed matter having such an image on both sides, a method of superimposing a printed matter on which a front image is formed and a printed matter on which a back image is formed, for example, (i) A front image and a back image are respectively formed on the same surface of the receptive layer of one thermal transfer image receiving sheet using a thermal transfer image receiving sheet provided with a receptive layer on the surface and a back layer on the other surface of the substrate For each of the front and back image forming portions, the thermal transfer image receiving sheet is cut so as to include the image portion, and the respective thermal transfer image receiving sheets cut (the printed matter having the cut front image and the cut back image (I) a method of producing a printed matter by laminating the printed matter having the above in a manner such that the back layers are in contact with each other and laminating the superposed printed matter in a laminate or a case; A front image is formed on the photo receiving sheet, a back image is formed on the other one of the thermal transfer image receiving sheets, and one heat transfer image receiving sheet (printed matter) on which the front image is formed, and the other on which the back image is formed. There can be mentioned a method of producing a print by overlapping one thermal transfer image-receiving sheet (printed matter) such that the back layers are in contact with each other.

In addition to this, (iii) on the first surface side and the first surface side of the support and the second surface side on the opposite side across the support as proposed in Patent Document 1; A printed image is formed by forming a front image on the ink receiving layer on the first side and forming a back image on the ink receiving layer on the second side using a double-sided recording medium having two or more ink receiving layers each. (Ii) As disclosed in Patent Document 2, a method for producing the same, and a release part in which a receiving layer, a colored layer, a base material layer, and an adhesive layer are laminated in this order, and a release sheet, A front image is formed on the receptive layer of one seal-type thermal transfer image-receiving sheet using the seal-type thermal transfer image-receiving sheet in which the release surface of the release sheet and the pressure-sensitive adhesive layer of the release part are releasably bonded. The release part on which the image is formed is peeled off from the release sheet to make a printed matter, and then one other seal type heat is generated. A reverse image is formed on the receiving layer of the copying image receiving sheet, and the release portion on which the reverse image is formed is peeled off from the release sheet to form a printed matter, and a printed matter on which the front image is formed and a reverse image are formed. A method of producing a printed matter, and the like can be mentioned by overlapping the printed matter with each other such that the adhesive layers are in contact with each other, and laminating them by using the adhesiveness.

In the use of printed matter having images on both sides, there is also a demand for obtaining printed matter in which a printed matter having a front image and a printed matter having a reverse image are accurately superimposed. However, as described above, the thermal transfer image receiving sheet having the receiving layer on one side of the substrate is generally prepared based on the purpose of improving the transportability inside the printer and suppressing the meandering of the thermal transfer image receiving sheet in the printer. A back layer is provided on the other side of the material, and the back friction is designed to be high. Therefore, as in the methods (i) and (ii), when the thermal transfer image receiving sheet on which the image is formed is superposed such that the back layers of the thermal transfer image receiving sheet are in contact with each other, As a result, there is a problem that it is difficult to finely move the superimposed printed materials and adjust their positions.

On the other hand, according to the method of (iii) above, it is not necessary to superimpose the front image and the back image,
As compared with the methods (i) and (ii), by enhancing the positional accuracy when forming the image, it is possible to manufacture a print in which the front image and the back image are accurately superimposed. However, this method requires a printer mechanism that forms a front image on the ink receiving layer on the first surface side, and then inverts the image forming surface when forming the back image on the ink receiving layer on the second surface side. It becomes. When the back image is formed on the ink receiving layer on the second side, it is necessary to bring the ink receiving layer on the first side (the ink receiving layer on which the front image is formed) into contact with the transport unit of the printer. The contact may cause scratches or wrinkles on the front image formed on the ink receiving layer on the first side. If a shift occurs in the formation position of the image when forming the front image and the back image, the yield is lowered. Moreover, the above-mentioned (ii
In the method of 2.), there is a problem that it is difficult to align itself by the tackiness.

JP, 2011-173411, A JP 2002-2127 A

  The present invention has been made in view of such a situation, and provides a release sheet capable of manufacturing a printed matter having a front image and a printed matter in which a printed matter having a back image is accurately superimposed. To be the main issue.

  A release sheet according to an embodiment of the present disclosure for solving the above problems is a release sheet in which a support portion and a release portion are integrated, and the release portion can be peeled off from the support portion. The mold release unit has a laminated structure in which a support for a mold release unit and an image forming layer are laminated in this order from the support unit side, and is positioned on the peeling interface side with the support unit. The static friction coefficient measured according to JIS-P-8147 (2010) between the surfaces of the mold release portion is 0.25 or less.

  Further, in the release sheet, the support for release part has a laminated structure in which a release layer and a base for release part are laminated in this order from the support side, and for the release part The thickness of the substrate may be 100 μm or less.

  In addition, in the release sheet, the base for the release part may have a single layer structure made of only a foamed polyolefin resin base or a laminated structure including a foamed polyolefin base resin. In addition, the support portion includes a support portion base material, and the support portion base material has a single layer structure made of only a foamed polyolefin resin substrate or a laminated structure including a foamed polyolefin resin substrate. It may be

  In addition, the above-mentioned foamed polyolefin resin base material may be a resin base material composed of a resin composition containing either one or both of a foamed polypropylene resin and a foamed polyethylene terephthalate resin.

  Moreover, the static friction coefficient measured based on JIS-P-8147 (2010) of the surfaces of the said support part located in the side which does not contact the said mold release part may be larger than 0.25.

  According to the release sheet according to the embodiment of the present disclosure, it is possible to manufacture a printed matter in which the printed matter having the front image and the printed matter having the reverse image are superimposed with high positional accuracy.

It is a schematic sectional drawing which shows an example of the release sheet of this indication. It is a schematic sectional drawing which shows an example of the release sheet of this indication. BRIEF DESCRIPTION OF THE DRAWINGS It is process drawing which shows an example of the manufacturing method of the printed material using the release sheet of this indication, and (a)-(c) is all schematic sectional drawing.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings and the like. Note that the present invention can be implemented in many different modes, and is not construed as being limited to the description of the embodiments exemplified below. In addition, the drawings may be schematically represented with respect to the width, thickness, and the like of each portion in comparison with the actual embodiment in order to clarify the description, but this is merely an example, and the interpretation of the present invention is limited. It is not a thing. In the specification of the present application and the drawings, the same elements as those described above with reference to the drawings in the drawings may be denoted by the same reference numerals, and the detailed description may be appropriately omitted.

<< Release sheet >>
As shown in FIGS. 1 and 2, in the release sheet 100 according to the embodiment of the present disclosure (hereinafter referred to as the release sheet of the present disclosure), the support portion 10 and the release portion 50 form an integral unit. The mold release unit 50 is provided so as to be peelable from the support unit 10. Further, the mold release unit 50 has a laminated structure in which the mold release unit base 55A and the image forming layer 60 are laminated in this order from the support unit 10 side. 1 and 2 are schematic cross-sectional views showing an example of the release sheet 100 of the present disclosure, and in the release sheet 100 in the form shown in FIG. 1, the support portion 10 is from the support base material 10A. The mold release unit 50 is formed by laminating the mold release unit base 55A (release unit support 55) and the image forming layer 60 in this order from the support unit 10 side. It has a laminated structure, and the support base material 10A is in contact with the release part base 55A of the release part support 55. Further, the release sheet 100 in the form shown in FIG. 2 has a laminated structure in which the support portion 10 is formed by laminating the support portion base material 10A and the adhesive layer 10B, and the release portion 50 has the support portion 10. It has a laminated structure in which the support 55 for the mold release portion, which is a laminate of the mold release layer 55B and the substrate 55A for the mold release portion, and the image forming layer 60 are laminated in this order from the side The adhesive layer 10B of the portion 10 is in contact with the release layer 55B that constitutes the support 55 for release portion.

  In describing each configuration of the release sheet 100 of the present disclosure, first, an example of a method of producing a printed matter using the release sheet 100 of the present disclosure will be described. In addition, the release sheet 100 of this indication is not used only for the use of manufacture of this printed matter.

  As an example of the production of a printed material using the release sheet 100 of the present disclosure, as shown in FIG. 3A, a front image 70A and a back image 70B are formed on the image forming layer 60 forming the release section 50. Form respectively. There is no particular limitation on the method of forming the front image 70A and the back image 70B, and conventionally known forming methods such as a sublimation thermal transfer method, a melt thermal transfer method, an inkjet printing method, etc. may be selected appropriately. Further, the configuration of the image forming layer 60 may be appropriately designed according to the type of the image forming method.

  Next, as shown in FIG. 3B, a mold release unit 50A having a front image 70A (hereinafter referred to as a mold release unit 50A) and a mold release unit 50B having a back image 70B (hereinafter referred to as a mold release unit 50B) Each of the above is cut and separated in the thickness direction of the release sheet 100. The mold release unit 50A and the mold release unit 50B can also be referred to as a printed matter having the front image 70A and a printed matter having the back image 70B, respectively. The cutting and separating method is not particularly limited. For example, after forming the front image 70A and the back image 70B, the release unit 50A and the release unit 50B are cut using a cutter unit provided inside and outside the printer. To separate the mold release portion 50A and the mold release portion 50B in advance by a general half-cut processing means such as rotary die processing or Thomson processing for the release sheet. After forming the front image 70A and the back image 70B by performing half cut processing, the mold release unit 50A and the mold release unit 50B can be separated using the half cut processing portion. In addition, perforating (it may be referred to as punching or cutting line processing) is performed in advance in the thickness direction of the release part 50 or in the thickness direction of the release sheet, and a front image is obtained. After forming 70A and the back image 70B, it is possible to separate the mold release portion 50A and the mold release portion 50B by using the perforated portion. In the illustrated embodiment, the release portion is cut so as to penetrate only the release portion 50 in the thickness direction, but even if the entire release sheet 100 is cut in the thickness direction. Good.

  Next, as shown in FIG. 3C, the release part 50A and the release part 50B, which are cut, are peeled off from the support part 10. Next, as shown in FIG. 3 (d), the surfaces of the mold release unit 50 located on the peeling interface side with the support unit 10 are in contact with each other (in the embodiment shown in FIG. 3 (d) And the mold release portion 50A and the mold release portion 50B are overlapped so that the upper surface of the support portion 55 for mold release portion is in contact with the lower surface of the support member 55 for mold release portion of the mold release portion 50B. The other mold release section (for example, mold release section 50B) is moved relative to (for example, the mold release section 50A) to perform alignment. Finally, the printed matter is manufactured by fixing the aligned release parts using various fixing methods. As various fixing methods, for example, a method of sealing in a laminate, a case that can be fitted, and the like can be mentioned.

  In the above alignment, in order to accurately align the mold release portions by moving the other mold release portion with respect to one of the mold release portions, the mold release portions in a state of being superposed are precisely adjusted. It is necessary to move. Specifically, in the configuration of the release sheet 100 of the present disclosure, it is necessary that the frictional force between the surfaces of the release portion 50 located on the peeling interface side with the support portion 10 be small. For example, when the release sheet 100 of the form shown in FIG. 1 is used, the surfaces of the base 55A for release part are used, or when the release sheet 100 of the form shown in FIG. It is necessary that the frictional force between the surfaces of the mold layer 55B be small. This is because when the frictional force at the portion where the surfaces of the mold release portions 50 contact each other is too high, the mold release portions are overlapped and the other mold release portion is moved with respect to one of the mold release portions. In addition, due to the magnitude of the frictional force, it becomes difficult to move the mold release portion with fine precision, and the alignment between the mold release portions can not be performed accurately.

  So, in the release sheet 100 of this indication, the static friction coefficient measured based on JIS-P-8147 (2010) of the surfaces of the mold release part 50 located in the peeling interface side with the support part 10 is 0. 25 or less. In other words, the static friction coefficient measured according to JIS-P-8147 (2010) of the surfaces of the mold release unit 50 located on the surface of the mold release unit 50 exposed by peeling from the support unit 10 is It is specified in 0.25 or less.

  In addition, the static friction coefficient as used in this-application specification means the static friction coefficient measured by the following method.

(Measurement method of static friction coefficient)
A release sheet is prepared, and the release portion is separated from the support portion of the release sheet. The separated mold release portions are cut in the thickness direction to prepare a pair of mold release portions. Hereinafter, the pair of mold release portions is referred to as a mold release portion X and a mold release portion Y. Also, hereinafter, in the measurement of the coefficient of static friction, in release parts X and Y separated and cut from the support part, the surface located on the peeling interface side with the support part at the stage before separation and cut from the support part The mold release portions X and Y are referred to as one surface, and the opposite surface is referred to as the other surface of the mold release portions X and Y.
The stage and the mold release portion X are fixed such that the stage and the other surface of the mold release portion X are in contact with each other (one side of the mold release portion X is the top surface). Next, one surface of the mold release section X and one surface of the mold release section Y are in contact with each other on the mold release section X fixed on the stage (the other surface of the mold release section Y is an upper surface And the release part Y are superimposed.
Next, a plastic plate molded to 100 mm × 60 mm is placed on the other surface of the mold release portion Y, and the mold release portion X and the mold release portion Y are brought into close contact with each other.
Next, a 1 kg weight was placed on a plastic plate, and a tensile speed of 10 mm / min. Then, the static friction force when moving the plastic plate by 50 mm is measured, and the static friction coefficient is calculated from the measured value.
The static friction force is measured using a surface property measuring machine (HEIDON SURFACE PROPERTY TESTER 14DR, Shinto Scientific Co., Ltd.).

  According to the release sheet 100 of the present disclosure in which such a definition is made, the surface of the release portion 50A located on the release interface side with the support 10 and the release interface located on the release interface side with the support 10 The mold release portion 50A and the mold release portion 50B are superimposed on each other so that the surface of the portion 50B is in contact with the other mold release portion (for example, mold release portion 50A). When the mold release unit 50B is moved for alignment, the mold release unit 50 can be moved with fine precision. Thereby, alignment of the mold release parts 50 in which the image was formed can be performed accurately.

  In the case where the requirement of the release sheet 100 of the present disclosure is not satisfied, specifically, the static friction coefficient of the surfaces of the release portion 50 located on the peeling interface side with the support portion 10 is larger than 0.25. In this case, the frictional force becomes too large when the mold release portions are overlapped and one mold release portion is moved relative to the other mold release portion, and the other mold release portion becomes fine. It becomes difficult to move with accuracy. That is, it is difficult to accurately align the mold release portions. Hereinafter, the static friction coefficient in the specification of the present invention means a static friction coefficient measured in accordance with JIS-P-8147 (2010) unless otherwise noted.

  In a preferred form of the mold release unit 50, the static friction coefficient of the surfaces of the mold release unit 50 located on the peeling interface side with the support unit 10 is 0.20 or less, and particularly 0.17 or less. The lower limit value is not limited in any way, but is about 0.05 in consideration of the manufacturing cost and the like.

  Hereinafter, each configuration of the release sheet 100 of the present disclosure will be specifically described. In the release sheet 100 of the present disclosure, the support portion 10 and the release portion 50 are integrated, the release portion 50 can be peeled off from the support portion 10, and the release portion 50 is a support portion. The mold supporting portion 55 and the image forming layer 60 are stacked in this order from the 10 side, and the static friction coefficient between the surfaces of the mold releasing portion 50 located on the peeling interface side with the support portion 10 is 0.25 or less As long as the conditions of the above are satisfied, the present invention is not limited to the embodiment shown below.

<Support part>
The support portion 10 is an essential component of the release sheet 100 of the present disclosure. There is no limitation in particular about the support part 10, A single layer structure may be exhibited and the laminated structure may be exhibited. For example, as shown in FIG. 1, the support portion 10 may have a single-layer structure composed of only the support portion base material 10A, and as shown in FIG. 2, the support portion 10 may be a support portion base material 10A. It may be a laminated structure of the adhesive layer 10B. Also, other configurations may be employed. For example, it may be a laminated structure in which a back layer (not shown), a support base 10A, and an adhesive layer 10B are laminated in this order, and the support base 10A, a primer layer (not shown), an adhesive layer 10B. Or the like may be a laminated structure formed by laminating in this order, or may be a structure in which these structures are appropriately combined.

(Base material for support part)
As the support base material 10A, for example, stretched or unstretched plastic such as polyethylene terephthalate, polyester resin such as polyethylene naphthalate, polypropylene resin, polycarbonate resin, cellulose acetate resin, polyethylene derivative, polyamide resin, polymethylpentene resin, etc. Resin base material (may be film), high quality paper, coated paper, resin coated paper, art paper, cast coated paper, paperboard, emulsion impregnated paper, synthetic rubber latex impregnated paper, synthetic resin internally added paper, cellulose fiber paper Etc. can be mentioned.

  In addition, when the image formation on the image forming layer 60 of the release sheet 100 of the present disclosure is performed by a printer including a spike roller or the like, a resin base having a void inside as the support base 10A. It is preferable to use (film), a foamed resin substrate (film), a resin substrate (film) having hollow particles, or the like. In particular, it is preferable that the support portion base material 10A have a single-layer structure made of only a foamed polyolefin resin substrate or a laminated structure including a foamed polyolefin resin substrate. As the foamed polyolefin resin, a foamed polypropylene resin and a foamed polyethylene terephthalate resin are suitable. As the support portion base material 10A having a laminated structure, a laminated structure of a non-foamed polyolefin resin substrate and a foamed polyolefin resin substrate, for example, a non-foamed polypropylene resin substrate, a foamed polypropylene resin substrate Can be mentioned. The base member 10A for a support part having a preferable laminated structure has a configuration in which a non-foamed polyolefin resin substrate and a foamed polyolefin resin substrate are laminated in this order from the mold release portion 50 side. The expanded polyolefin resin base material and the non-expanded polyolefin resin base material may be laminated in this order from the release part 50 side. In addition, the foamed polyolefin resin base and the non-foamed polyolefin resin base may be combined arbitrarily, and three or more layers of these resin bases may be laminated in any order. According to the support base 10A including the foamed polyolefin-based resin base, it is possible to improve the transportability when the release sheet 100 including the support base 10A is transported in the printer. Specifically, due to the presence of the foamed polyolefin-based resin substrate, the support portion 10 of the release sheet 100 can sufficiently grip the transport member of the printer, for example, the spike roller, etc. The transportability of the release sheet 100 can be improved.

  As a resin base material which has a void inside, the polyolefin resin base material which has a void inside can be mentioned, for example. Examples of polyolefin resins include polyesters with high heat resistance such as polyethylene, polyethylene terephthalate and polyethylene naphthalate, and polyolefin resins such as polypropylene, polybutene, polyisobutene, polybutadiene, polyisoprene and ethylene-vinyl acetate copolymer. it can.

  The resin base material which has a void in an inside can be obtained by two methods shown below, for example. One is a method in which inorganic fine particles are kneaded into a polymer, and when the compound is stretched, microvoids are generated with the inorganic fine particles as a core, and the other one is incompatible with the main resin. This is a method of creating a compound in which polymers (one or more) may be blended. When viewed microscopically, polymers form a fine sea-island structure, and by stretching this compound, voids are generated due to exfoliation of the sea-island interface or large deformation of the polymer forming islands.

  The thickness of the support portion base material 10A is not particularly limited, and may be set in consideration of the entire thickness of the release sheet 100. For example, in consideration of the conveyance force of the printer, the entire thickness of the release sheet 100 is preferably in the range of 50 μm to 1500 μm, and more preferably in the range of 100 μm to 300 μm. Therefore, the thickness of the support portion base material 10A is preferably set in such a range that the thickness of the release sheet 100 is the above-mentioned preferable thickness. The same applies to the thickness of the adhesive layer 10B and other optional layers constituting the support portion.

(Adhesive layer)
As shown in FIG. 2, in order to enhance the adhesion between the support 10 and the release part 50, the support 10 may have a laminated structure of a support base 10A and an adhesive layer 10B. There is no limitation in particular about the component of the adhesion layer 10B, and it may set suitably in consideration of adhesiveness with the mold release part 50. Examples of components of the adhesive layer 10B include acrylic resins, vinyl resins, polyester resins, urethane resins, polyamide resins, epoxy resins, rubber resins, ionomer resins, and the like. The thickness of the adhesive layer 10B is not particularly limited, but is generally in the range of 5 μm to 20 μm, preferably in the range of 8 μm to 10 μm.

  In addition, when the support portion 10 includes the adhesive layer 10B, when the release portion 50 is peeled from the support portion 10, the adhesive layer 10B shifts to the peeled release portion 50 side. The adhesive force between the support base material 10A and the adhesive layer 10B is higher than the adhesive force with the component (the support member 55 for mold release) in contact with the adhesive layer 10B in order to suppress ing. For example, corona discharge treatment, flame treatment, ozone treatment, ultraviolet treatment on the surface of the support base material 10A in contact with the adhesive layer 10B as a method for enhancing the adhesion between the support base material 10A and the adhesive layer 10B. Radiation treatment, roughening treatment, chemical treatment, plasma treatment, low temperature plasma treatment, primer treatment, grafting treatment and the like can be mentioned. The primer treatment referred to here includes a configuration in which a primer layer (not shown) is provided between the support portion base material 10A and the adhesive layer 10B. In addition, a primer layer comprises the support part 10 in this case.

  In the release sheet 100 of the present disclosure, the coefficient of static friction between the surfaces of the support portion 10 located on the side not in contact with the release portion 50 (the lower surface of the support portion base 10A in the embodiment shown in FIGS. Although there is no limitation, it is preferably greater than 0.25, and more preferably 0.35 or more. By setting the static friction coefficient of the surfaces of the support portion 10 located on the side not in contact with the mold release portion to a preferable range, for example, formation of an image on the image forming layer 60 of the mold release sheet 100 of the present disclosure When it is carried out by a printer provided with a heating member such as, it can be suppressed that the heating member slips from the surface of the support 10 in contact with the heating member. As a result, the occurrence of wrinkles and the like in the image formed on the image forming layer 60 can be suppressed.

  Moreover, in the form shown in FIG. 1 and FIG. 2, the surface of the support part 10 on the side not in contact with the mold release part is the surface of the support base material 10A. An optional layer (for example, a back friction adjusting layer) for adjusting the static friction coefficient is positioned on the surface of the non-supporting portion 10, and the surfaces of the supporting portion 10 located on the side not in contact with the mold release portion 50 The coefficient of static friction can also be adjusted.

<Release part>
As shown in FIGS. 1 and 2, in the release sheet 100 of the present disclosure, the support portion 10 and the release portion 50 are integrated, and the release portion 50 can be peeled off from the support portion 10. There is. In addition, the mold release unit 50 has a laminated structure in which the mold release unit support 55 and the image forming layer 60 are laminated in this order from the support unit 10 side.

(Support for mold release part)
The release part support 55 may have a single layer structure or a laminated structure. For example, as shown in FIG. 1, the support 55 for the mold release portion may be composed of only the base material 55A for the mold release portion, and as shown in FIG. 2, the support 55 for the mold release portion is supported. From the part 10 side, it is good also as a laminated structure formed by laminating | stacking the mold release layer 55B and the base material 55A for mold release parts in this order. Also, other configurations may be employed.

  The release sheet 100 of the present disclosure is exposed by peeling off the release portion 50 from the support portion 10, in other words, the static friction coefficient of the surfaces of the release portion 50 located on the release interface side with the support portion 10. The coefficient of static friction between the surfaces of the support 55 for the mold release portion to be formed is specified to be 0.25 or less. Therefore, as shown in FIG. 1, in the case where the mold release portion support 55 is configured only with the mold release portion base 55A, the coefficient of static friction between the mold release portions 55A is 0.25. It becomes below. On the other hand, as shown in FIG. 2, in the case where the release member support 55 has a laminated structure including the release layer 55 B and the release member base 55 A from the support 10 side, The layer located on the peeling interface side of the above becomes the release layer 55B. Therefore, in this case, the coefficient of static friction between the surfaces of the release layer 55B is 0.25 or less. Also when the support 55 for release part has a laminated structure, the layer located on the peeling interface side with the support 10 is a layer other than the release layer 55B or the base 55A for release part. It is similar.

(Base material for mold release part)
As the mold release portion base 55A as an example forming the mold release portion support 55, the resin base materials listed in the support portion base 10A described in the above support portion can be appropriately selected and used. , Detailed description here is omitted.

  In the case where the release sheet 100 of the present disclosure and a thermal transfer sheet having a color material layer are combined and energy is applied to the thermal transfer sheet to form a thermal transfer image on the image forming layer 60, support for the release portion It is preferable that the body 55 has thermal insulation which holds the energy applied from the thermal transfer sheet in the mold release portion. Therefore, in the illustrated embodiment, it is preferable that the mold release portion base 55A have a heat insulating property that holds the energy applied from the thermal transfer sheet inside. By imparting thermal insulation to the release part base material 55A, an image with high density can be formed on the image forming layer. Examples of the heat releasing part base material 55A having thermal insulation include a foamed resin base material, a resin base material having voids inside, a resin base material having hollow particles, and the like.

  Among these, it is preferable that the substrate 55A for release part have a single-layer structure made of only a foamed polyolefin resin substrate or a laminated structure including a foamed polyolefin resin substrate. As the foamed polyolefin resin, a foamed polypropylene resin and a foamed polyethylene terephthalate resin are suitable. A laminated structure of a non-foamed polyolefin resin substrate and a foamed polyolefin resin substrate, for example, a non-foamed polypropylene resin substrate, and a foamed polypropylene resin substrate, as the mold release portion substrate 55A of the laminated structure And laminated structures. The substrate 55A for release part having a preferable laminated structure has a configuration in which a non-foamed polyolefin resin substrate and a foamed polyolefin resin substrate are laminated in this order from the support portion 10 side. In addition, the expanded polyolefin resin base material and the non-expanded polyolefin resin base material may be laminated in this order from the support portion 10 side. In addition, the foamed polyolefin resin base and the non-foamed polyolefin resin base may be combined arbitrarily, and three or more layers of these resin bases may be laminated in any order.

  Further, in the production of a printed product as an example using the release sheet 100 of the present disclosure, the release section 50 of the release sheet 100 is cut in the thickness direction. Therefore, the thickness of the substrate 55A for release part is 100 μm or less in consideration of the cutting suitability at the time of this cutting, specifically, the wear of the cutting mechanism such as a cutter, the processing suitability at the cutting, etc. Is preferred. In addition, in the form shown in FIG.3 (b), although it cuts so that only a mold release part may penetrate in a thickness direction, it can also be cut | judged so that the release sheet whole may be penetrated in a thickness direction.

  As shown in FIG. 1, in the case where the support 55 for release part has a single-layer structure consisting of only the release part base 55A, the release part base located on the peeling interface side with the support part. The coefficient of static friction between the mold release portion base materials 55A is set to 0.25 or less by a method of enhancing the smoothness of the surface of the material 55A or a method of incorporating a mold release component in the mold release portion base material 55A. Can. When the mold release portion base 55A is made of a resin base having voids, a resin base having hollow particles, or a foamed resin base in order to impart thermal insulation to the mold release portion 50, The coefficient of friction between the surfaces of the substrate 55A for releasing part tends to increase. Therefore, in the case of using a heat insulating base material as the mold release portion base 55A, the surface of the mold release portion 50 located on the peeling interface side with the support portion 10 is a layer for adjusting the static friction coefficient, As shown in FIG. 2, the coefficient of static friction of the surfaces of the mold release portion 50 located on the side of the peeling interface with the support portion may be adjusted to 0.25 or less as the mold release layer 55B.

  As a component of the release layer 55B, the coefficient of static friction of the surfaces of the release portion located on the side of the peeling interface with the support portion (the lower surfaces of the release layer 55B in the embodiment shown in FIG. 2) is 0.25 or less There is no particular limitation as long as the components that can be used are appropriately selected. As an example, various silicone modified resins such as waxes, silicone wax, silicone resin, silicone modified acrylic resin, fluorine resin, fluorine modified resin, polyvinyl alcohol, acrylic resin, thermosetting epoxy-amino copolymer, and thermosetting resin Alkyd-amino copolymer (thermosetting amino alkyd resin), melamine based resin, cellulose based resin, urea based resin, polyolefin based resin, acrylic based resin, cellulose based resin and the like can be mentioned. The release layer 55B may contain one type of component alone, or may contain two or more types of components.

  The range of 0.1 micrometer or more and 0.4 micrometer or less can be mentioned as an example of the thickness of the mold release layer 55B. In addition, a primer layer (not shown) may be provided between the mold release portion base 55A and the mold release layer 55B.

(Image forming layer)
An image forming layer 60 is provided on the release layer support 55. The image forming layer 60 constitutes a releasing unit 50.

  The image forming layer 60 may be appropriately selected according to the image formed on the image forming layer 60, and is not limited in any way. In particular, the release sheet of the present disclosure is a support for the release portion 55 exposed by peeling the surfaces of the release portion 50 located on the release interface side with the support portion 10, that is, releasing the release portion 50. The image forming layer 60 not located on the peeling interface side with the support portion 10 overlaps the above-described mold release portion 50A and the mold release portion 50B. When performing alignment, it does not contribute to the accuracy of the alignment at all and can be set arbitrarily.

  For example, by combining a thermal transfer sheet provided with a dye layer containing a sublimation dye and the release sheet of the present disclosure, the sublimation dye is transferred to the image forming layer 60 by a sublimation thermal transfer method to form an image. In the latter case, the image forming layer 60 may be made of a material capable of receiving a sublimation dye.

  Examples of materials capable of receiving a sublimation dye include polyolefin resins such as polypropylene, halogenated resins such as polyvinyl chloride or polyvinylidene chloride, polyvinyl acetate, vinyl chloride-vinyl acetate copolymer, ethylene-vinyl acetate Copolymers or vinyl resins such as polyacrylates, polyester resins such as polyethylene terephthalate or polybutylene terephthalate, polystyrene resins, polyamide resins, copolymers of olefins such as ethylene or propylene with other vinyl polymers, Examples thereof include cellulose resins such as ionomers and cellulose diacetate, and solvent resins such as polycarbonate and acrylic resins. One of these materials may be used alone, or two or more of these materials may be used in combination. The thickness of the image forming layer 60 in this case is preferably in the range of 0.5 μm to 10 μm, and more preferably in the range of 2 μm to 5 μm.

  When an image is formed on the image forming layer 60 using an inkjet printer, the image forming layer 60 may be made of a material that can accept inkjet ink. As such an image forming layer 60, any of those conventionally known in the field of ink jet printing can be selected.

  In the above description, the image forming layer 60 is mainly described as a layer before the thermal transfer image is formed, but a layer on which an image is formed in advance may be used as the image forming layer.

  In addition, although the release sheet 100 of the present disclosure has a configuration in which the release portion 50 can be removed from the support portion 10, the support portion 10 and the release portion 50 are integrated when forming an image on the image forming layer 60. Take a configuration. That is, by appropriately selecting the thickness of the support portion 10 which does not ultimately contribute to the production of a print, the thickness of the release sheet 100 can be made a thickness capable of optimizing the conveyance force in the printer. it can.

  Next, the present invention will be more specifically described by way of examples and comparative examples. Hereinafter, unless otherwise noted, parts or% are based on mass and are values before conversion to solid content.

(Preparation of base material)
Base 1 Foamed polyethylene terephthalate film (thickness: 75 μm)
(Crisper Toyobo Co., Ltd.)
Base material 2: Foamed polyethylene terephthalate film (thickness: 100 μm)
(Crisper Toyobo Co., Ltd.)
Base material 3: Foamed polyethylene terephthalate film (thickness: 125 μm)
(Crisper Toyobo Co., Ltd.)
Base material 4: non-foamed polyethylene terephthalate film (thickness: 100 μm)
(Lumirror Toray Corporation)

Example 1
The above base material 1 is used as the substrate for the release part, and the thickness of the release layer coating liquid having the following composition on drying on one side of this release part substrate is 0.25 μm when dried By applying and drying to form a release layer, a release portion support was obtained in which the release portion base and the release layer were laminated. Also, on the other surface of the release part base material, a receiving layer coating liquid of the following composition is applied and dried so as to have a dry thickness of 4.2 μm, and a receiving layer (image forming layer (image forming layer) Thus, a mold release portion provided with a receiving layer (image forming layer) on a support for mold release portion was obtained.
Moreover, using the above-mentioned base material 2 as a base for a support part, the coating liquid for an adhesive layer of the following composition is applied on one surface of this base for a support part so that the thickness at the time of drying becomes 9 μm. -The support part in which the adhesion layer was provided on the base material for support parts was obtained by drying and forming an adhesion layer.
Next, an example in which the support portion and the release portion are integrated by bonding the obtained support portion and the release portion so that the adhesive layer of the support portion and the release layer of the release portion are in contact with each other. A release sheet of 1 was obtained.

(Coating fluid for release layer)
-Addition polymerization agent silicone 100 parts (KS847H Shin-Etsu Chemical Co., Ltd.)
-200 parts of toluene

(Coating fluid for receptive layer)
・ Vinyl chloride-vinyl acetate copolymer 12 parts (Solvaine (registered trademark) C Nisshin Chemical Industry Co., Ltd.)
-Epoxy modified silicone 0.8 parts (X-22-3000T Shin-Etsu Chemical Co., Ltd.)
· Amino-modified silicone 0.24 part (X-22-1660B-3 Shin-Etsu Chemical Co., Ltd.)
-Toluene 30 parts-Methyl ethyl ketone 30 parts

(Coating fluid for adhesive layer)
・ Acrylic copolymer 15 parts (SK dyne 1251 Soken Chemical Co., Ltd.)
Hardener 0.33 parts (hardener L-45 Soken Chemical Co., Ltd.)
Hardening agent 0.1 part (E-AX Soken Chemical Co., Ltd.)
-Ethyl acetate 16.14 parts

(Example 2)
The release sheet of Example 2 is obtained in the same manner as in Example 1 except that instead of the base 1 described above, the base 2 for the release part is used to form the support for the release part. Obtained.

(Example 3)
The release sheet of Example 3 is obtained in the same manner as in Example 1 except that instead of the base 1 described above, the base 3 for the release part is used to form the support for the release part. Obtained.

(Example 4)
The release sheet of Example 4 is obtained in the same manner as in Example 1 except that instead of the base 1 described above, the base 4 for the release part is used to form the support for the release part. Obtained.

(Example 5)
A release sheet of Example 5 was obtained in the same manner as Example 1, except that the base 4 was used as the base for the support instead of the base 2 to form the support.

(Example 6)
The seal is peeled off from a commercially available seal paper (name seal factory ZEST Co., Ltd.) consisting of a seal and separate paper, and the separated paper after peeling is used as a release layer, and the peeling interface with the seal of the separate paper Is carried out in the same manner as Example 1 except that the opposite surface was bonded to one surface of the substrate 1 as a substrate for release part using an adhesive to form a release part. The release sheet of Example 6 was obtained. The separate paper is usually discarded after peeling the seal, and in the release sheet of Example 6, the surface located on the peeling interface side of the mold release portion is the peeling surface with the seal of the separate paper. ing.

(Example 7)
The seal is peeled off from a commercially available seal paper (Mickey & Minnie Hologram Big Sticker Co., Ltd. Motobayashi Co., Ltd.) consisting of a seal and separate paper, and the peeled separate paper is used as a release layer, and the seal with the separate paper The same as in Example 1 except that the surface opposite to the peeling interface was attached to one surface of the substrate 1 as a substrate for release part using an adhesive to form a release part. Thus, a release sheet of Example 7 was obtained. The separate paper is usually discarded after peeling the seal, and in the release sheet of Example 7, the surface located on the peeling interface side of the mold release portion is the peeling surface with the seal of the separate paper. ing.

(Comparative example 1)
A genuine ribbon (thermal transfer image receiving sheet) of a sublimation transfer printer (DS40, Dai Nippon Printing Co., Ltd.) was used as Comparative Example 1. Hereinafter, the thermal transfer image receiving sheet of Comparative Example 1 is referred to.

(Comparative example 2)
A4 inkjet copying paper (KJ-M16A4-100) (Kokuyo Co., Ltd.) was used as Comparative Example 2. Hereinafter, the ink jet copying paper of Comparative Example 2 is referred to.

(Formation of image)
A release type transfer printer (DS 40, Dai Nippon Printing Co., Ltd.), the release sheet of each example, and the thermal transfer image receiving sheet of comparative example 1 are used in combination, and the release sheet of each example and comparative example 1 The thermal transfer image A and the thermal transfer image B were formed at predetermined intervals on the receiving layer of the thermal transfer image receiving sheet. The thermal transfer image A and the thermal transfer image B are both black solid images (image gradation: 0/255 gradation) of the same shape. No image formation was performed on the inkjet copying paper of Comparative Example 2.

(Cut)
Subsequently, using a cutter, the release sheet of each of Examples and Comparative Examples in which the thermal transfer image A and the thermal transfer image B were formed was cut in the thickness direction along the outer edges of the thermal transfer image A and the thermal transfer image B. In addition, in the release sheet of the example, the cutting is performed so as to penetrate only the release portion, and the thermal transfer image receiving sheet of Comparative Example 1 having no release portion and the inkjet copy sheet of Comparative Example 2 The cutting was performed so as to penetrate the whole in the thickness direction. In addition, about the inkjet copying paper of the comparative example 2 which is not forming the thermal transfer image, it cut | judged so that it might become the same shape as each Example.

(Peeling)
Subsequently, the release part having the thermal transfer image A and the release part having the thermal transfer image B were peeled off from the supporting part.

(Measurement of static friction coefficient)
The release part having the above-mentioned thermal transfer image A and the release part having the thermal transfer image B obtained by using the release sheet of each example are overlapped so that the respective release layers are in contact with each other, The static friction coefficient between the layer surfaces was determined by the "method of measuring the static friction coefficient" described above in accordance with JIS-P-8147 (2010). The thermal transfer image receiving sheet of Comparative Example 1 is superimposed such that the back sides of the cut thermal transfer image receiving sheet (surfaces on the side on which the thermal transfer image is not formed) are in contact with each other. With regard to the sheets, the coefficient of static friction was measured by superposing them so that the cut inkjet copy sheets were in contact with each other. The measurement results are shown in Table 1.

(Alignment evaluation)
The release portion having the thermal transfer image A and the release portion having the thermal transfer image B, obtained using the release sheet of each example, are superimposed such that the respective release layers are in contact with each other, and the thermal transfer image is obtained. The ease of alignment when adjusted with a finger so that the directions of A and thermal transfer image B accurately coincide with each other, and the quality of the mold release part were evaluated based on the following evaluation criteria. The evaluation results are shown in Table 1 together. The thermal transfer image-receiving sheet of Comparative Example 1 is overlapped such that the back surfaces of the thermal transfer image-receiving sheet are in contact with each other, and the ink jet copy sheet of Comparative Example 2 is in contact with the surfaces of the ink jet copy sheet. Evaluation was performed by overlapping.

"Evaluation criteria"
A: The positions of each other can be easily adjusted and readjusted, and there is no occurrence of quality defects due to rubbing.
NG (1): It is possible to adjust and re-adjust each other's position, but a quality defect such as fuzz or surface flaw due to rubbing occurs.
NG (2): Once alignment fails, it is not possible to perform alignment again.

(Image density evaluation)
The reflection density of the thermal transfer image A (black solid image) formed on the receptive layer of the release sheet of each example and the thermal transfer image receiving sheet of Comparative Example 1 is measured by a spectrometer (i1 X-Rite), and The concentration was evaluated based on the evaluation criteria of The evaluation results are shown in Table 1.

"Evaluation criteria"
A: The reflection density of the black solid image is 2.0 or more.
B: The reflection density of the black solid image is 1.5 or more and less than 2.0.
NG: The reflection density of the black solid image is less than 1.5.

(Conveyance evaluation)
A sublimation type transfer printer (DS40, Dai Nippon Printing Co., Ltd.), the release sheet of each example, and the thermal transfer image receiving sheet of Comparative Example 1 are used in combination to form 10000 images for each, 1000 sheets. For each print, the presence or absence of misregistration (color shift) due to transport failure was visually confirmed, and transportability was evaluated based on the following evaluation criteria. The evaluation results are shown in Table 1 together.

"Evaluation criteria"
A: No misregistration occurs at the completion of printing of 10000 sheets.
B: A registration error occurred at the completion of printing of 8,000 to 9,000 sheets.
C: A registration error occurred at the completion of printing of 5,000 to 7,000 sheets.

(Shipping evaluation)
Half removal (only the release part) and all removal of the release sheet of each example were performed using a pinnacle blade (blade height 2 mm) (Takatani Cutlery Co., Ltd.). The punching quality of the sheet was confirmed every 10,000 times of punching, and the punching quality at the time when the number of times of punching reached the specified number was sensory-evaluated.

"Evaluation criteria"
A: When 100000 times were reached, there was no removal failure of the release sheet for both half and half removal.
B: At any one time of 5000 to 90,000 times, at least one of the half removal and all removal occurred a removal failure of the release sheet.
C: At any one time of 10000 to 40000 times, at least one of the half removal and the full removal occurred a removal failure of the release sheet.

100 release sheet 10 support portion 10A support portion base material 10B adhesive layer 50 release portion 55 support portion 55A support portion 55A release portion base 55B release layer 60 image formation layer

Claims (6)

It is a release sheet in which the support portion and the release portion are integrated,
The release part is provided so as to be removable from the support part,
The release part has a laminated structure in which a support for release part and an image forming layer are laminated in this order from the support part side,
The static friction coefficient measured according to JIS-P-8147 (2010) of the surfaces of the mold release portion located on the side of the peeling interface with the support portion is 0.25 or less.
A release sheet characterized by The support for release part has a laminated structure in which a release layer and a base for release part are laminated in this order from the support side,
The thickness of the substrate for release part is 100 μm or less.
The release sheet according to claim 1, characterized in that: The base for the release part has a single layer structure made of only a foamed polyolefin resin base, or a laminated structure including a foamed polyolefin base resin.
The release sheet according to claim 2, wherein the release sheet. The support includes a support base,
The base for the support portion has a single-layer structure made of only a foamed polyolefin-based resin base, or a laminated structure including a foamed polyolefin-based resin base.
The release sheet according to any one of claims 1 to 3, characterized in that: The foamed polyolefin resin substrate is a resin substrate comprising a resin composition containing either or both of a foamed polypropylene resin and a foamed polyethylene terephthalate resin.
The release sheet according to claim 3 or 4 characterized by things. The coefficient of static friction measured according to JIS-P-8147 (2010) of the faces of the support portion positioned on the side not in contact with the mold release portion is greater than 0.25,
The release sheet according to any one of claims 1 to 4, characterized in that:

Images