JP6623327B2 - Composite sheet - Google Patents

Description

  The present invention relates to a composite sheet. More specifically, the present invention relates to a composite sheet excellent in flexibility, durability against repeated bending fatigue, light resistance, heat fusion, workability, dimensional accuracy, and excellent strength characteristics such as tear resistance.

  In recent years, in the fields of bookbinding, automotive sheets, packaging materials, and the like, there is an increasing demand for sheet materials that are thin and flexible and have high durability.

  For example, in the bookbinding field, after the four terrorist attacks using airplanes, etc., which occurred frequently in the United States on September 11, 2001, the demand for enhanced security of passports increased, and the United States led the normal The transition from passports to electronic passports with advanced security has begun. This new electronic passport uses a plastics data page for writing personal information.

  A sheet made of polycarbonate resin having excellent durability and strength is mainly used for the plastic data page. Specifically, the plastics data page (hereinafter sometimes simply referred to as “data page”) includes a plurality of polycarbonate resin sheets, a sheet called an inlet in which an IC chip and an antenna are arranged, and a data page. And a flexible sheet for joining the electronic passport cover. The plastics data page is an important page for providing a personal authentication function in which personal information such as nationality, gender, photograph, and name is recorded. Further, the flexible sheet for joining the data page and the electronic passport cover is a very important sheet for firmly joining important pages on which personal information is recorded. This flexible sheet is also called a hinge sheet.

  Therefore, as a hinge sheet satisfying such requirements, for example, a woven fabric made of polyester or polyamide yarn has been proposed.

  Here, the joining method of the hinge sheet and the polycarbonate resin sheet is such that after forming a laminate in which the polycarbonate resin sheet is disposed on the front side and the back side of the hinge sheet, the laminate is heated and pressurized (data page heating and pressurization). Lamination step). By performing such a data page heating and pressing laminating step, a part of the softened polycarbonate resin sheet enters the opening of the fabric from the front and back sides of the fabric, and the polycarbonate resin disposed above and below the fabric at the opening of the fabric. A method of connecting the polycarbonate resins constituting the sheet to each other can be adopted. In this way, a connection structure of the polycarbonate resin sheets on the front and back sides of the fabric is formed.

  However, in the data page heating / pressing lamination process, there is a case where a problem that a proper connection structure cannot be formed due to a variation in heating / pressing conditions depending on an apparatus or a manual operation may occur. That is, peeling may occur between the fabric and the upper and lower polycarbonate resin sheets.

  When such a problem occurs, it means that personal information and IC-Chip written by laser marking on the data page can be easily forged by a forger, and the personal authentication function of the passport This is a problem related to the fundamentals of

  Therefore, in recent years, a hinge sheet comprising a woven fabric and a thermoplastic resin sheet having excellent flexibility such as a thermoplastic polyurethane elastomer has been proposed (for example, see Patent Document 1).

  According to Patent Literature 1, a woven sheet is produced by plain weaving using a single yarn (monofilament) made of at least one kind of polymer yarn selected from the group consisting of polyester, polyamide, and polypropylene. Further, after that, the thermoplastic resin sheet laminated with the fabric is heated and pressurized to soften and penetrate into the opening of the fabric, and to completely close the opening, the opening ratio of the fabric (the area of the opening relative to the area of the fabric) Is increased (substantially 50% or more).

Patent No. 4456175

  However, the polymer yarn of the woven fabric in the sheet described in Patent Literature 1 is a single yarn (monofilament), and the strength such as the tear strength of the hinge sheet is inferior due to the large opening ratio of the woven fabric. There was a problem. In general, a data page has a configuration in which a plurality of polycarbonate resin sheets are arranged above and below an inlet sheet and a hinge sheet.

  Further, the sheets described in Patent Document 1 are formed by pressing each of the plurality of sheets as described above under a high temperature of 180 to 200 ° C. by using a vacuum press machine, so that the respective sheets are strongly heated and fused. ing. However, the polypropylene used in the hinge sheet described in Patent Literature 1 has a melting point of 160 to 165 ° C, and thus melts in the data page heating lamination step. For this reason, the hinge sheet made of a polypropylene woven sheet has a problem that the strength for firmly joining the data page to the cover is not exhibited.

  Therefore, the sheet described in Patent Literature 1 has a significant problem in that strength properties such as tear resistance and repeated bending durability, which are important functions of the hinge sheet, cannot be exhibited. That is, the data page can be torn and removed from the stitched portion of the passport, and there is a possibility that the forgery of the passport or the like is performed.

  Under such circumstances, development of a composite sheet (that is, a hinge sheet) having excellent strength properties such as tear resistance and repeated bending durability has been desired.

  The present invention has been made to solve the problems of the related art as described above. That is, a composite sheet having excellent strength characteristics such as tear resistance and repeated bending durability and capable of preventing a data page from being torn and removed from a knitting site such as a passport by using as a hinge sheet for a passport or the like is provided. I do.

  According to the present invention, the following composite sheet is provided.

[1] A composite sheet of a woven sheet having at least a warp and a weft and having an opening formed therein, and a thermoplastic elastomer having excellent flexibility,
The woven sheet is a woven sheet in which the warp and the weft are all made of polyester multifilament or polyamide multifilament,
The thermoplastic elastomer has a surface hardness of 60 or more and 83 or less according to JIS-A, and a difference in yellowness (ΔYI) after a test time of 400 hours by a xenon arc test of 5 or less,
The thermoplastic elastomer enters the opening of the woven sheet and closes the opening of the woven sheet ,
The woven sheet is a composite sheet having an opening ratio of 50 to 75% .

[2] The composite sheet according to [1], wherein the opening of the woven fabric sheet is in a region surrounded by the warp and the weft, and has an intersection at a portion where the warp and the weft intersect.

[3] The composite sheet according to [1] or [2], wherein the warp and the weft have a diameter of 60 to 120 μm, respectively.
[4] The composite sheet according to any one of [1] to [3], wherein the polyester multifilament and the polyamide multifilament each include 30 to 200 fiber yarns.

  The composite sheet of the present invention is excellent in flexibility, durability against repeated bending fatigue, light resistance, heat fusion, workability, dimensional accuracy, and also excellent strength characteristics such as tear resistance.

It is a perspective view showing typically one embodiment of a composite sheet of the present invention. It is explanatory drawing in evaluation of the softness | flexibility in the composite sheet of an Example and a comparative example. It is explanatory drawing in evaluation of the fusion | melting strength in the composite sheet of an Example and a comparative example. It is explanatory drawing in evaluation of the fusion | melting strength in the composite sheet of an Example and a comparative example. It is explanatory drawing in evaluation of generation | occurrence | production of the wrinkle in the composite sheet of an Example and a comparative example. It is explanatory drawing in evaluation of generation | occurrence | production of the wrinkle in the composite sheet of an Example and a comparative example. FIG. 2 is a partially enlarged view schematically showing a state in which a portion including an opening of a woven sheet in one embodiment of the composite sheet of the present invention is enlarged and cut out.

  Hereinafter, embodiments for carrying out the present invention will be described, but the present invention is not limited to the following embodiments. That is, it is understood that, based on the ordinary knowledge of those skilled in the art, modifications and improvements made to the following embodiments are also included in the scope of the present invention without departing from the spirit of the present invention. Should be.

[1] Composite sheet:
As one embodiment of the composite sheet of the present invention, there is a composite sheet 100 as shown in FIG. The composite sheet 100 is a composite sheet of a woven fabric sheet 11 having at least a warp and a weft and formed with an opening, and a thermoplastic elastomer 12 having excellent flexibility. The woven fabric sheet 11 is a woven fabric sheet in which the warp and the weft are all made of polyester multifilament or polyamide multifilament. Further, the thermoplastic elastomer has a surface hardness of 60 or more and 83 or less according to JIS-A, and a difference in yellowness (ΔYI) after 400 hours of a xenon arc test is 5 or less. In the composite sheet 100, the thermoplastic elastomer enters the opening of the woven sheet and closes the opening of the woven sheet.

  The composite sheet 100 has excellent flexibility and excellent tear strength in addition to excellent flexibility, durability against repeated bending fatigue, light resistance, heat fusion, workability, and dimensional accuracy. For this reason, the composite sheet 100 can provide an electronic passport with extremely high forgery resistance particularly when used as a hinge sheet in an electronic passport data page.

[1-1] Textile sheet:
The diameters of the warp and the weft of the woven sheet are not particularly limited, and a numerical value in a range according to the intended use can be selected. For example, the thickness of the electronic passport is determined for each country, but the overall thickness is specified to some extent. The thickness of the hinge sheet disposed therein is determined within a certain range due to the total thickness being defined. Therefore, the diameter of the yarn is preferably an appropriate size.

  Specifically, the diameters of the warp and the weft of the woven fabric sheet are preferably in the range of 60 to 120 μm, respectively, more preferably 70 to 100 μm, and particularly preferably 80 to 100 μm. . When the diameter of each of the warp and the weft is within the above range, the composite sheet exhibits excellent flexibility and excellent tear strength. If the diameter of each of the warp and the weft is less than the lower limit value, the tear diameter may be too small to obtain a sufficient tear strength. If the diameter of each of the warp and the weft exceeds the upper limit, the woven fabric sheet becomes too thick, so that the flexibility of the composite sheet (hinge sheet) cannot be sufficiently obtained, and the electronic passport data page becomes thick. In some cases.

  The diameters of the warp and the weft can be measured using any device capable of correctly measuring the shape. Examples thereof include a digital microscope, a one-shot 3D shape measuring machine, a laser microscope, and image size measurement. , A 3D scanner type three-dimensional measuring machine, or various devices such as a caliper can be used. This is a value measured using a digital microscope.

Further, the opening ratio of the woven fabric sheet is not particularly limited, but an industrial product of the woven fabric sheet having an opening ratio of more than 80% is not generally used, and therefore generally has an upper limit of 80%. The reason for this is probably that if the opening ratio exceeds 80%, the openings are too wide, and in the process of weaving the woven sheet, for example, problems such as curling and wrinkling may occur. . Alternatively, even after a weaving process, even if a woven sheet is obtained, the intersections (intersections) where the warp and the weft of the woven sheet intersect are too few, and the intersection of the woven sheet shifts, so-called misalignment. It is presumed that it may be difficult to maintain the quality as an industrial product. Further, in such a case, it is conceivable to bond the intersection with an adhesive, which is very special. Here, the aperture ratio of the fabric sheet Ri 50% to 75% der, particularly preferred arbitrarily to be 50% to 60%. When the opening ratio of the woven fabric sheet is within the above range, excellent flexibility of the woven fabric sheet is exhibited. If the opening ratio of the woven fabric sheet is less than the lower limit, the flexibility of the woven fabric sheet cannot be obtained, and the flexibility of the composite sheet becomes insufficient.

  The aperture ratio of the woven sheet refers to the ratio of the area of the opening to the area of the entire woven sheet. In this opening, an intersection 15 is formed in a region surrounded by the yarns (warp 12a and weft 12b (see FIG. 7)) constituting the woven fabric sheet, that is, at a portion where the warp and weft intersect. It can also be said that it is a hole defined by 15. And, more specifically, the aperture ratio of the woven fabric sheet is expressed by the formula: aperture ratio = [((A-1) × (A-2)) ÷ ((P-1) × (P-2))] × It is a value calculated by 100 (%). Here, as shown in FIG. 7, "A-1" is the distance between the adjacent warps 12a, and "A-2" is the distance between the adjacent wefts 12b. "P-1" is the distance between the intermediate positions (the position where the central axis is located) of the adjacent wefts 12b, and "P-2" is the distance between the adjacent warps 12a. FIG. 7 is a partially enlarged view schematically showing a state in which a portion including an opening of the woven fabric sheet is enlarged and cut out.

  In the case of a multifilament, the diameter of the yarn (wire diameter) indicates the diameter in the width direction. Here, the multifilaments of the woven sheet do not exhibit an extremely elliptical shape (to the extent that they are not circular when viewed closely). In such a multifilament, the softening effect is such that when the woven sheet is bent, the cross section of the multifilament changes from a circular shape to an elliptical shape, so that the diameter of the yarn in the bending direction becomes smaller, and the yarn in the right-angle direction becomes smaller. The diameter increases (becomes elliptical). Thereby, it is more excellent in flexibility than a woven sheet containing a monofilament.

  The multifilament is subjected to tensile tension in the warp direction when weaving a woven fabric, so that the cross section of the warp becomes somewhat elliptical. Further, the weft is also applied with a slight tensile tension in order to knit the weft with respect to the warp to which the tensile tension is applied. Therefore, the cross section of the weft is also somewhat elliptical. At this time, the diameters of the warp and the weft are elliptical diameters (major diameters) in the longitudinal direction. However, at the stage of fabric (without thermoplastic elastomer), the cross section of the yarn is not extremely elliptical. At this stage, the shape is slightly elliptical, and its shape slightly changes depending on the tensile tension applied to the warp and the weft and the production speed. When such a fabric enters the gap between the heating rolls together with the soft sheet, a compressive force is applied between the two rolls. As a result, the cross section of the yarn in the obtained composite sheet has an elliptical shape.

  The woven sheet is a woven sheet in which the warp and the weft are all made of polyester multifilament or polyamide multifilament.

  The woven sheet is excellent in flexibility of the woven sheet because the thickness of the woven sheet is smaller than that of the woven sheet composed of only monofilaments having the same yarn diameter.

  Specifically, all the warp and weft yarns are made into multifilaments made of a predetermined material. By doing so, the cross-sectional shape of each of the warp and the weft at the intersection at the intersection of the warp and the weft (hereinafter sometimes referred to as “intersection” as appropriate) may be increased due to the tensile tension at the time of weaving. Be elliptical. For example, since the multifilament is formed by twisting a plurality of single yarns, the single yarn is displaced along the length direction of the mating yarn at the intersection of the warp and the weft, so that the cross section of the multifilament is flattened. It has an elliptical shape (not a perfect circle). Therefore, the thickness of the intersection of the warp and the weft in the woven fabric sheet is reduced due to the flat deformation of the yarn. And since it can be said that the thickness of the woven fabric sheet is equal to the thickness of this intersection, a reduction in the thickness of the intersection is synonymous with a reduction in the thickness of the woven fabric sheet. Therefore, when using the same yarn diameter, the woven fabric sheet using the multifilament has a smaller thickness than the woven fabric sheet composed only of the monofilament. From another viewpoint, if the thickness of the woven fabric sheet is the same, the woven fabric sheet using the multifilament can be used with a larger yarn diameter than the woven fabric sheet composed of only the monofilament. Will have excellent strength properties.

  That is, when a “composite sheet” having the above “woven sheet” and “thermoplastic elastomer” is used as a hinge sheet, the hinge sheet becomes a hinge sheet having a woven sheet made of a monofilament having the same thread diameter and a thermoplastic elastomer. Compared to the sheet, the strength is equal but the flexibility is excellent.

  Further, when compared with a woven sheet having the same thickness, a multifilament having a larger diameter than the monofilament can be used, so that the strength of the woven sheet is excellent. This hinge sheet (composite sheet) composed of a woven sheet and a thermoplastic elastomer layer has the same flexibility as a hinge sheet composed of a monofilament of the same thickness, which is composed of a woven sheet and a thermoplastic elastomer layer. However, it is excellent in strength.

  The “multifilament” is a yarn (for example, a twisted yarn) composed of a plurality of fiber yarns (single yarns), and the number of fiber yarns is not particularly limited. It is a book. Specifically, the “polyester multifilament” is a yarn composed of a plurality of polyester fiber yarns (single yarns). Further, the “monofilament” is a yarn composed of one fiber yarn.

  The woven sheet is not particularly limited, but is preferably a woven sheet composed of at least one kind of weave selected from the group consisting of plain weave and twill weave, and may be woven with plain weave. More preferred. With such a weaving method, the manufacturing unit price is relatively low.

  The thickness of the woven sheet is not particularly limited, and a numerical value in a range according to the intended use can be selected. For example, the thickness of the electronic passport is determined for each country, but the overall thickness is specified to some extent. When the overall thickness is defined, the thickness of the hinge sheet disposed therein is determined within a certain range. This woven sheet preferably has a thickness of 70 to 150 μm, more preferably 90 to 140 μm, and particularly preferably 100 to 140 μm. When the thickness of the woven fabric sheet is in the above range, there is an advantage that the tear resistance of the woven fabric sheet is excellent and the flexibility of the obtained composite sheet is excellent. If the thickness of the woven sheet is less than the lower limit, the tear resistance of the woven sheet may be reduced. If the thickness of the woven sheet exceeds the upper limit, the flexibility of the obtained composite sheet may be reduced.

[1-2] Thermoplastic elastomer:
The thermoplastic elastomer needs to have a surface hardness of 60 or more and 83 or less according to JIS-A, and preferably 70 to 83. When the surface hardness according to JIS-A is within the above range, both the flexibility and the effect of suppressing the generation of wrinkles at the hinge portion are compatible. If the surface hardness is less than the lower limit, it is difficult to produce a thin sheet such as a hinge sheet. If the surface hardness exceeds the upper limit, the flexibility of the composite sheet cannot be sufficiently obtained. Note that wrinkles at the hinge portion occur as follows. That is, in the heating and laminating step for manufacturing the polycarbonate sheet laminate, the soft resin (thermoplastic elastomer) in the hinge sheet softens and flows and protrudes into the hinge portion, thereby generating wrinkles. Note that, in the electronic passport, the polycarbonate sheet laminate is a data page for storing an image, a number, and the like of an individual in an IC chip (IC-Chip), and for drawing by laser marking.

  “Surface hardness is JIS-A” means “Type A” for medium hardness (such as general rubber) in the JIS standard.

  Examples of the thermoplastic elastomer include a thermoplastic polyurethane elastomer, a thermoplastic polyamide elastomer, a thermoplastic polyester elastomer, and a thermoplastic acrylic elastomer. These can be used alone or in combination of two or more.

  Further, the difference in yellowness (ΔYI) of the thermoplastic elastomer after a test time of 400 hours by a xenon arc test needs to be 5 or less, preferably 3 or less, more preferably 2 or less. Is particularly preferred. When the difference in yellowness (ΔYI) after a test time of 400 hours by the xenon arc test is 5 or less, durability can be ensured even when used for a long time like an electronic passport. On the other hand, if the difference in yellowness (ΔYI) after 400 hours of the xenon arc test is more than 5, discoloration occurs not only due to long-term use (ie, due to aging) but also in the light resistance test. Since the strength of the thermoplastic elastomer decreases, the strength of the hinge portion of the data page decreases. Therefore, it is not preferable as a hinge sheet for an electronic passport.

  In the composite sheet of the present invention, the thermoplastic elastomer enters the opening of the woven sheet and closes the opening of the woven sheet. In other words, in the composite sheet of the present invention, a filling layer made of a thermoplastic elastomer is formed at the opening of the woven fabric sheet, and the opening of the woven fabric is closed by this filling layer.

  In the composite sheet of the present invention, an inorganic filler, an organic filler, and the like may be mixed as long as the function is not impaired.

  The thickness of the composite sheet of the present invention is not particularly limited, but may be, for example, 70 to 160 μm.

[1-3] Uses of composite sheet:
The composite sheet of the present invention can be used as a hinge sheet used for a passport.

[2] Production method of composite sheet:
The composite sheet of the present invention can be produced, for example, as follows.

  The method for producing a composite sheet according to the present invention may include a soft sheet forming step and a softening invasion step. The soft sheet forming step is a step of forming a soft sheet made of a thermoplastic elastomer by melt extrusion using an extruder with a T-die. And the softening invasion step includes a softening invasion step A or a softening invasion step B.

  In the softening intrusion step A, after laminating a soft sheet and a woven sheet having at least a warp and a weft and having an opening formed therein, a metal roll / rubber roll for heating and cooling (metal roll and rubber roll are used) Using a pair of rolls), the soft sheet and the woven sheet are heated and pressurized, and the thermoplastic elastomer constituting the soft sheet is softened and penetrated into the opening of the woven sheet. This is a step of producing a composite sheet in which the elastomer is integrated. Note that a plurality of rolls such as a metal roll / metal roll and a metal roll / rubber roll can be used. Here, in the heating and pressing lamination of a thin sheet (about 20 to 200 μm), a combination of a metal roll / rubber roll is generally used, but a metal roll / metal roll is also used. In the case of metal rolls / metal rolls, the roll gap is narrow because the sheet is thin, and when the metal roll is in a heated state, it is accompanied by thermal expansion of the metal roll and micro-vibration of roll rotation. Since there is a concern that the metal rolls may contact each other in the gap, a combination of a metal roll / rubber roll is generally used.

  In the softening invasion step B, a soft sheet in a softened state immediately after being extruded from an extruder with a T-die and a woven sheet having at least a warp and a weft and an opening formed therein are laminated, and the softened state is obtained. The soft sheet and the woven sheet are pressure-pressed using a pair of metal rolls. Then, the thermoplastic elastomer constituting the soft sheet is softened and penetrated into the opening of the woven sheet. Thereafter, the composite sheet is caused to enter between the metal roll and the rubber roll in the next heated state, and the thermoplastic elastomer is penetrated to the side opposite to the side where the soft sheet is softened and penetrated into the woven sheet. Then, a thermoplastic elastomer skin layer is formed on both sides of the woven sheet, and the thickness is controlled to a predetermined value. Thereafter, the composite sheet is guided between the cooled metal roll and the rubber roll, and the composite sheet is cooled to produce a composite sheet in which the woven fabric and the thermoplastic elastomer are integrated. However, the arrangement and number of the metal rolls and rubber rolls have been described above by way of example, and other combinations may be used.

  According to the manufacturing method as described above, flexibility, excellent durability in repeated bending fatigue, light resistance, heat fusing property, workability, dimensional accuracy, and further, strength properties such as tear resistance, repeated bending durability, etc. It is possible to manufacture a composite sheet excellent in quality.

[2-1] Flexible sheet molding step:
As the thermoplastic elastomer, those having a surface hardness of 40 or more and 83 or less according to JIS-A can be used, and the same thermoplastic elastomers as described in the above-described composite sheet of the present invention can be used.

  As the extruder with a T-die, a conventionally known one can be appropriately selected and used. Further, as the conditions for the melt extrusion molding, conventionally known conditions can be appropriately adopted.

[2-2] Softening penetration step:
As the softening invasion step, for example, any of the above softening invasion steps A and B can be selected.

[2-2-1] Softening penetration step A:
As the “metal roll / rubber roll for heating and cooling”, conventionally known rolls can be appropriately selected and used.

  As the conditions for heating and pressing the soft sheet and the woven sheet, conventionally known conditions can be appropriately adopted.

[2-2-2] Softening penetration step B:
"The soft sheet in the softened state immediately after being extruded" means that the thermoplastic elastomer enters the opening of the woven sheet by pressing using a pair of metal rolls, and the thermoplastic elastomer and the woven sheet are pressed together. It means a soft sheet in a state where it does.

  As the pair of metal rolls, conventionally known rolls can be appropriately selected and used.

  The conditions for applying pressure using a metal roll are not particularly limited, and conventionally known conditions can be appropriately adopted.

  Hereinafter, the present invention will be specifically described based on examples and comparative examples, but the present invention is not limited to these examples and comparative examples.

[Test method]
[1] Soft sheet (1) Surface hardness:
The surface hardness of the prepared soft sheet was measured in accordance with JIS-K7311.
(2) Light fastness:
The samples were treated with a Xenon arc tester (black panel temperature = 63 ° C.) manufactured by Suga Test Machine for 400 hours, and the change in yellowness before and after the treatment (ΔYI) was measured.

[2] Composite sheet (1) Flexibility:
After cutting the composite sheet into a size of 50 mm in width × 200 mm in length to obtain a sheet test piece A, the sheet test piece A was placed on the horizontal table 21 shown in FIG. At this time, the sheet test piece A protruded from the end of the horizontal base 21 with a length of 50 mm (a part in the length direction). Then, the glass plate 22 (width 100 mm, length 200 mm, thickness 3 mm) was placed on the sheet test piece A. Then, the extent (length D) of the protruding portion of the sheet test piece A was measured. It should be noted that the length D of this sag is, when viewed from the side as shown in FIG. 2, an extension line (shown by a broken line in FIG. 2) of the upper surface of the sheet test piece A on which the horizontal table 21 is placed. The distance to the farthest part (the tip of the protruding sheet test piece A) was used. After the measurement, the following four grades were evaluated.
G1: 25mm or more "excellent in flexibility"
G2: 20 or more and less than 25 mm "good flexibility"
B1: 15 to less than 20 mm "insufficient flexibility"
B2: less than 15 mm "poor in flexibility"

(2) Tear strength:
The tear strength of the composite sheet was measured in accordance with JIS-K7128-1, and the maximum value was determined.

  The tear strength is preferably higher, specifically, it is preferably 90 N / mm or more, and more preferably 150 N / mm or more.

(3) Fusing strength:
The composite sheet was cut into a size of 15 cm in length × 15 cm in width to produce a sheet test piece B, and four 200 μm-thick polycarbonate sheets (white) (white polycarbonate resin sheet 31) of the same dimensions were prepared. Then, these are laminated in order from the bottom so that a polycarbonate sheet (white) 31, a polycarbonate sheet (white) 31, a sheet test piece B, a polycarbonate sheet (white) 31, and a polycarbonate sheet (white) 31 are formed. I got a piece. Thereafter, a part (10 cm from the end) of the surface of the polycarbonate sheet (white) 31 placed on the sheet test piece B on the sheet test piece B side was coated with black magic ink (in FIG. 3, The black magic ink portion is indicated by reference numeral 32). Thereafter, a polyimide film 35 was arranged above and below the laminated test piece, and further, a SUS plate 36 was arranged above and below this (see FIG. 3). Then, it was heated and pressed at a heating temperature of 185 ° C. by a vacuum heating compression molding machine, and then cooled to obtain a heated laminated test piece. The portion where the black magic ink was applied was in a state where the polycarbonate sheet (white) and the sheet test piece B were not fused, and this portion was used as a pick portion (chuck portion) in the peeling test (180 ° peel test). .

  Thereafter, the heat-laminated test piece was cut so as to have a width of 20 mm, thereby producing a peel test test piece 40. Then, a 180 ° peel test was performed using the peel test specimen 40 at a test speed of 200 mm / min as shown in FIG. 4, and the peel strength (N / mm) was measured. The peel strength was evaluated as the fusion strength.

  The peel strength is preferably higher, specifically, 6 N / mm or more.

(4) Wrinkles in the binding part of the sewing machine:
The following sheets were laminated in order from the bottom to obtain a polycarbonate sheet laminate 50 (see FIG. 6). Specifically, a transparent polycarbonate sheet 51 having a length of 125 mm, a width of 85 mm, and a thickness of 100 μm, a transparent polycarbonate sheet 52 of the same dimension for laser marking having a thickness of 100 μm, a white polycarbonate sheet 53 of the same dimension having a thickness of 200 μm, and a length of 125 mm A composite sheet 100 having a width of 95 mm, a white polycarbonate sheet 53 of the same size for printing with a thickness of 200 μm, a transparent polycarbonate sheet 52 of the same size for laser marking with a thickness of 100 μm, and a transparent polycarbonate sheet 51 of the same size with a thickness of 100 μm were laminated in this order. . The composite sheet 100 was arranged so as to project 10 mm from the obtained polycarbonate sheet laminate 50. Then, as shown in FIG. 5, the laminated body 50 was disposed so as to be sandwiched between a SUS plate 36 having a length of 200 mm, a width of 200 mm, and a thickness of 2 mm and a polyimide film 35 having a length of 200 mm, a width of 200 mm, and a thickness of 125 μm. . Thereafter, this was heated and pressed by a vacuum heating compression molding machine at a heating temperature of 185 ° C. and a pressure of 140 N / mm, and then cooled to obtain a polycarbonate sheet laminate 50 shown in FIG. In the polycarbonate sheet laminate 50, the occurrence of wrinkles at a portion (the sewing machine binding portion 100a) of the composite sheet 100 projecting 10 mm from the polycarbonate sheet laminate 50 was visually observed and evaluated as follows.
W-1: Wrinkles are hardly generated.
W-2: Some wrinkles are observed, but sewing can be performed without any problem.
W-3: It is difficult to bind the sewing machine due to generation of wrinkles.

  The data page of the electronic passport has a hinge sheet overhanging from the polycarbonate sheet laminate, and the overhanging portion is used for sewing and binding with a cover and a visa sheet. For this reason, it is preferable that wrinkles are not generated in the sewing machine binding portion.

(Example 1)
"Composite sheet [H1]"
First, a soft film (S1) was obtained. Specifically, a polyether-based non-yellowing thermoplastic polyurethane elastomer having a surface hardness (JIS-A) of 80 (manufactured by BASF Japan, trade name “Elastollan NY80”) is charged into an extruder equipped with a T-die and heated to 200 ° C. A soft film (S1) having a thickness of 60 μm was obtained by melt extrusion molding. Using this soft film (S1), the surface hardness and light resistance were measured. The ΔYI value was determined from the following.

[△ YI value]
The yellowness before and after the light resistance test was measured according to JIS-K7373, and the ΔYI value was determined by the following equation.
Formula: ΔYI = YI (400) −YI (0)
However, in the above formula, YI (0) is the yellowness before the light fastness test, and YI (400) is the yellowness after the light fastness test. In the present invention, ΔYI of the thermoplastic elastomer is 5 or less, and the soft film made of the thermoplastic elastomer has excellent light resistance.

  The following woven sheet was used for the woven sheet (F1). That is, the yarn type was polyester multifilament, the wire diameter was 83 μm, the plain weave, the opening ratio was 55%, and the thickness was 100 μm.

  Next, a composite sheet [H1] was obtained using the soft film (S1) and the woven sheet (F1). Specifically, after laminating the soft film (S1) and the woven sheet (F1), it is compressed using a hot roll laminator at a heating roll temperature of 160 ° C., and a part (heat) of the soft film (S1). (Plastic elastomer) was softened and penetrated into the openings of the woven sheet (F1), and the thermoplastic elastomer was embedded in the openings of the woven sheet (F1). Thus, a composite sheet [H1] having a thickness of 110 μm was obtained.

  Various tests were performed on the obtained composite sheet [H1] as shown in Table 1.

  In Tables 1 to 4, "polyester (multi)" indicates that the yarn type is a polyester multifilament, and "polyamide (multi)" indicates that the yarn type is a polyamide multifilament.

(Examples 2 to 8, Reference Examples 9 and 10 , Comparative Examples 1 to 8)
A composite sheet was produced in the same manner as in Example 1 except that the conditions shown in Tables 1 to 4 were satisfied. Various tests were performed on the produced composite sheet as shown in Tables 1 to 4.

(result)
As shown in Tables 1 to 4, the composite sheets of Examples 1 to 8 and Reference Examples 9 and 10 were superior to the composite sheets of Comparative Examples 1 to 4 in light resistance, flexibility, strength, and polycarbonate. It was confirmed that it had a heat-sealing strength with the resin sheet.

  On the other hand, Comparative Example 1 has excellent light resistance, flexibility, and heat-sealing strength with a polycarbonate resin sheet, but is inferior in tear strength. Furthermore, in Comparative Example 1, although the wire diameter is the same (83 μm) in comparison with Example 1, the thickness of the woven fabric is 130 μm, and therefore, the thickness of the composite sheet using the woven fabric is 140 μm. is there. That is, in Comparative Example 1, the thickness is larger than the thickness (110 μm) of the composite sheet of Example 1. In other words, the tear strength of the composite sheet of Comparative Example 1 having a thickness of 140 μm is inferior to that of the composite sheet of Example 1 having a thickness of 110 μm.

  Like the ID card, the total thickness of the electronic passport data page is preferably about 800 μm, and the hinge sheet is desirably as thin as possible as long as the strength such as the tear strength can be maintained at a constant level. From such a viewpoint, the composite sheet of Comparative Example 1 is difficult to be practically used because it is thick and has poor tear strength.

  Comparative Example 2 is inferior in flexibility because the surface hardness of the thermoplastic elastomer is too high.

  Comparative Example 3 is inferior in workability and dimensional accuracy because the surface hardness of the thermoplastic elastomer is too low, so that when used as a hinge sheet, wrinkles of the sewing machine binding portion are greatly generated.

  In Comparative Example 4, since a general-purpose type thermoplastic polyurethane elastomer was used, the light resistance was insufficient, and it was difficult to practically use a hinge sheet for an electronic passport that requires long-term durability.

As described above, the composite sheets of Examples 1 to 8 and Reference Examples 9 and 10 are excellent in flexibility, durability against repeated bending fatigue, light resistance, heat fusion, workability, and dimensional accuracy, and furthermore, tear. It was confirmed that strength characteristics such as resistance were excellent. Therefore, it can be used as a hinge sheet for a passport.

  The composite sheet of the present invention can be used as a hinge sheet for a passport.

11: Textile sheet, 12: Thermoplastic elastomer, 21: Horizontal base, 22: Glass plate, 31: White polycarbonate resin sheet (polycarbonate sheet (white)), 32: Black magic ink part, 35: Polyimide film, 36: SUS Plate, 40: Test specimen for peel test, 50: Polycarbonate sheet laminate, 51: Transparent polycarbonate sheet, 52: Transparent polycarbonate sheet for laser marking, 53: White polycarbonate sheet for printing, 100: Composite sheet, A: Sheet specimen , B: sheet test piece, D: sag length.

Claims (4)

A fabric sheet having at least a warp and a weft and having an opening formed therein, and a composite sheet of a thermoplastic elastomer having excellent flexibility,
The woven sheet is a woven sheet in which the warp and the weft are all made of polyester multifilament or polyamide multifilament,
The thermoplastic elastomer has a surface hardness of 60 or more and 83 or less according to JIS-A, and a difference in yellowness (ΔYI) after a test time of 400 hours by a xenon arc test of 5 or less,
The thermoplastic elastomer enters the opening of the woven sheet and closes the opening of the woven sheet ,
The woven sheet is a composite sheet having an opening ratio of 50 to 75% .   2. The composite sheet according to claim 1, wherein the opening of the woven fabric sheet is located in a region surrounded by the warp and the weft, and has an intersection at a portion where the warp and the weft intersect. 3.   3. The composite sheet according to claim 1, wherein the woven sheet has a diameter of each of the warp and the weft of 60 to 120 μm. 4. The composite sheet according to any one of claims 1 to 3, wherein the polyester multifilament and the polyamide multifilament each include 30 to 200 fiber yarns.