JP2019072911A - Composite sheet - Google Patents

Abstract

To provide a composite sheet excellent in strength properties, such as tearing resistance and repeated bending durability.SOLUTION: A composite sheet 100 is formed of a fabric sheet 11 having at least a warp and a weft and having an opening and a thermoplastic elastomer 12 excellent in flexibility. The fabric sheet 11 has all warp and weft consisting of a polyester multifilament or a polyamide multifilament, and the thermoplastic elastomer 12 has a surface hardness of 60 or more and 83 or less in JIS-A and a yellowness difference (▵YI) of 5 or less after a test time of 400 hours by a xenon arc test and penetrates into the opening of the fabric sheet 11 to close the opening of the fabric sheet 11.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a composite sheet. More particularly, the present invention relates to a composite sheet which is excellent in flexibility, repeated bending fatigue durability, light resistance, heat fusion property, processability, dimensional accuracy, and strength characteristics such as tear resistance.

  In recent years, in the field of bookbinding, automotive sheets, packaging materials, etc., the demand for thin, flexible and highly durable sheet materials is increasing.

  For example, in the field of bookbinding, the need for security enhancement of passports has increased after four terrorist attacks using aircraft etc. which occurred simultaneously in the United States on September 11, 2001 at the same time. The transition from passports to e-passports with high security has begun. The new electronic passport uses a plastics data page for writing personal information.

  In this plastic data page, a sheet made of polycarbonate resin excellent in durability and strength is mainly used. Specifically, the plastics data page (hereinafter sometimes referred to simply as "data page") includes a plurality of polycarbonate resin sheets, a sheet called an inlet on 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 identification function in which personal information such as nationality, gender, photos, names, etc. is recorded. Furthermore, the flexible sheet for joining the data page and the electronic passport cover is a very important sheet for firmly joining the important page in which personal information is recorded. And this flexible sheet is also called a hinge sheet.

  Then, as a hinge sheet which meets such a demand, textiles which consist of yarn of polyester or polyamide, for example are proposed.

  Here, the method of joining the hinge sheet and the polycarbonate resin sheet is as follows: 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 pressing) Stacking process). By performing such a data page heating and pressing laminating process, a polycarbonate resin sheet in which a part of the softened polycarbonate resin sheet is made to enter the opening of the fabric from the front and back of the fabric, and polycarbonate resins disposed above and below the fabric at the opening of the fabric A method may be employed in which the polycarbonate resins constituting the sheet are connected to each other. In this way, a connecting structure of polycarbonate resin sheets on the front and back sides of the fabric is formed.

  However, in the data page heating and pressing laminating process, the heating and pressing conditions may vary depending on the apparatus, or may vary due to an artificial operation, and a problem may occur that an appropriate connection structure is not formed. That is, peeling may occur between the fabric and the upper and lower polycarbonate resin sheets.

  If such a problem occurs, it means that even personal information and IC-Chip written by laser marking on the data page can be easily forged by a forger, and the personal identification function possessed by passport is Problem related to the basis of

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

  According to Patent Document 1, a woven sheet is produced in plain weave using a single yarn (monofilament) composed of at least one type of polymer yarn selected from the group consisting of polyester, polyamide, and polypropylene. After that, the thermoplastic resin sheet laminated with the fabric is heated and pressurized to soften and enter the opening of the fabric, and the opening ratio of the fabric (area of the opening relative to the area of the fabric) in order to completely close the opening. Ratio) is large (substantially 50% or more).

Patent No. 4456175

  However, the polymeric yarns of the woven fabric in the sheet described in Patent Document 1 are inferior in strength such as tear strength of the hinge sheet due to being a single yarn (monofilament) and the large open area ratio of the woven fabric, etc. There was a problem with Generally, the data page has a configuration in which a plurality of polycarbonate resin sheets are disposed above and below the inlet sheet and the hinge sheet.

  Furthermore, the sheets described in Patent Document 1 press each of the plurality of sheets as described above under a high temperature of 180 to 200 ° C. using a vacuum press to firmly heat and fuse the respective sheets. ing. However, since the polypropylene used in the hinge sheet described in Patent Document 1 has a melting point of 160 to 165 ° C., it melts in the data page heating and laminating step. From such a thing, the hinge sheet | seat which consists of a textile sheet made from polypropylene has the problem that the intensity | strength for joining a data page firmly to a cover is not exhibited.

  Therefore, the sheet described in Patent Document 1 has a major problem that it can not exhibit strength characteristics such as tear resistance and repeated bending durability which are important functions of the hinge sheet. That is, the data page can be torn and removed from the stitched part of the passport, and there is a possibility that the passport or the like will be forged.

  From such a thing, development of the composite sheet (namely, hinge sheet | seat) excellent in the strength characteristics, such as tear resistance and repeated bending durability, is desired.

  The present invention has been made to solve the problems of the prior art as described above. That is, a composite sheet is provided that is excellent in strength characteristics such as tear resistance and repeated bending durability, and can be used as a hinge sheet such as a passport to prevent the data page from being torn and removed from a knit binding site such as a passport. Do.

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

[1] A composite sheet of a fabric sheet having at least warp and weft threads and having an opening formed therein, and a thermoplastic elastomer excellent in flexibility,
The woven sheet is a woven sheet in which the warp and the weft are all polyester multifilaments or polyamide multifilaments,
The thermoplastic elastomer has a surface hardness of 60 or more and 83 or less according to JIS-A, and a difference (ΔYI) in yellowness after a test time of 400 hours according to a xenon arc test is 5 or less,
A composite sheet in which the thermoplastic elastomer intrudes into the opening of the woven sheet to close the opening of the woven sheet.

[2] The composite sheet according to the above [1], wherein the opening of the fabric sheet is in a region surrounded by the warp and the weft, and a crossing portion is provided in a portion where the warp and the weft intersect.

[3] The composite sheet according to [1] or [2], wherein the diameter of each of the warp yarns and the weft yarns is 60 to 120 μm, and the opening ratio is 35 to 75%.

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

It is a perspective view which shows typically one Embodiment of the composite sheet of this 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 melt | fusion strength in the composite sheet of an Example and a comparative example. It is explanatory drawing in evaluation of the melt | fusion strength in the composite sheet of an Example and a comparative example. It is explanatory drawing in evaluation of generation | occurrence | production of the wrinkles in the composite sheet of an Example and a comparative example. It is explanatory drawing in evaluation of generation | occurrence | production of the wrinkles in the composite sheet of an Example and a comparative example. It is the elements on larger scale which show typically the state which cut out the part containing the opening part of the textile sheet in one embodiment of the composite sheet of this invention.

  Hereinafter, although the form for implementing this invention is demonstrated, this invention is not limited to the following embodiment. That is, it is understood that any of the embodiments described below can be appropriately modified or improved based on the general knowledge of those skilled in the art without departing from the spirit of the present invention and also belongs to the scope of the present invention. It should.

[1] Composite sheet:
One embodiment of the composite sheet of the present invention is a composite sheet 100 as shown in FIG. The composite sheet 100 is a composite sheet of a fabric sheet 11 having at least warp and weft threads and an opening formed therein, and a thermoplastic elastomer 12 having excellent flexibility. The fabric sheet 11 is a fabric sheet in which all warps and wefts are composed of polyester multifilaments or polyamide multifilaments. Further, the thermoplastic elastomer has a surface hardness of 60 or more and 83 or less according to JIS-A, and a difference (ΔYI) in yellowness after a test time of 400 hours according to a xenon arc test is 5 or less. Then, in the composite sheet 100, the thermoplastic elastomer intrudes into the opening of the fabric sheet to close the opening of the fabric sheet.

  This composite sheet 100 has excellent flexibility and excellent tear strength, in addition to being excellent in flexibility, repeated bending fatigue durability, light resistance, heat fusion, processability and dimensional accuracy. Therefore, the composite sheet 100 can provide an extremely high anti-counterfeit electronic passport by being particularly used as a hinge sheet in a data page of the electronic passport.

[1-1] Textile sheet:
The diameters of the warp yarns and weft yarns of the fabric sheet are not particularly limited, and a numerical value in the range corresponding to the use application can be selected. For example, the thickness of the electronic passport is determined for each country, but the overall thickness is defined to some extent. And, because the overall thickness is defined, the thickness of the hinge sheet disposed therein is also determined within a certain range. Therefore, it is preferable that the diameter of the yarn be an appropriate size.

  Specifically, the diameter of the warp and weft of the fabric sheet is preferably in the range of 60 to 120 μm, more preferably 70 to 100 μm, and particularly preferably 80 to 100 μm. . When the diameter of each of the warp yarns and weft yarns is in the above range, excellent tearing strength can be obtained while the composite sheet exhibits excellent flexibility. If the diameter of each of the warp yarns and weft yarns is less than the lower limit, sufficient tear strength may not be obtained because the yarn diameter is too thin. When each diameter of the warp and weft exceeds the upper limit value, the fabric sheet becomes too thick, so that the flexibility of the composite sheet (hinge sheet) can not be sufficiently obtained, and the electronic passport data page becomes thick. There is a possibility that

  The diameter of the warp and weft can be measured using any device that can measure the shape correctly, for example, a digital microscope, one-shot 3D shape measuring machine, laser microscope, image dimension measurement A variety of devices can be used, such as machines, 3D scanner type three-dimensional measuring machines, or calipers. It is a value measured using a digital microscope.

  Furthermore, the open area ratio of the woven sheet is not particularly limited, but the industrial product of the woven sheet having an open area exceeding 80% is not generally used, so the upper limit is generally 80%. The reason for this is presumably that if the opening ratio exceeds 80%, the opening becomes too wide, and problems such as occurrence of warping and wrinkles may occur in the process of weaving the fabric sheet. . Alternatively, after passing through the weaving process, even if a woven fabric sheet is obtained, there may be too few crossing points (intersection points) where the warp and weft of the woven fabric sheet intersect, so that the crossing points of the woven fabric sheet are deviated Etc. may occur, and it is presumed that it is difficult to maintain the quality as an industrial product. Furthermore, in such a case, it is conceivable to glue the crossing points with adhesive, which is very special. Here, the opening ratio of the fabric sheet is preferably 35 to 75%, more preferably 50 to 75%, particularly preferably 50 to 60%, and 40 to 60%. Most preferably. When the opening ratio of the woven sheet is in the above range, excellent softness is exhibited in the woven sheet. If the opening ratio of the woven sheet is less than the lower limit value, the flexibility of the woven sheet can not be obtained, and the flexibility of the composite sheet becomes insufficient.

  The open area 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 yarns (warp 12a and weft 12b (see FIG. 7)) constituting the fabric sheet, that is, a portion where the warp and weft intersect. It can be said that it is a hole divided by 15. And the opening ratio of the fabric sheet is more specifically expressed by the equation: Opening ratio = [((A-1) x (A-2)) / ((P-1) x (P-2))] x It is a value calculated by 100 (%). Here, as shown in FIG. 7, "A-1" is a distance between adjacent warps 12a, and "A-2" is a distance between adjacent wefts 12b. "P-1" is a distance between intermediate positions (positions with a central axis) of adjacent wefts 12b, and "P-2" is a distance between adjacent warps 12a. In addition, FIG. 7 is the elements on larger scale which show typically the state which expanded and cut out the part containing the opening part of a textile sheet.

  In the case of a multifilament, the diameter (wire diameter) of the yarn indicates the diameter in the width direction. Here, the multifilaments of the fabric sheet do not exhibit an extremely oval shape (in a close view, they are not round). In such multifilaments, the softness effect is that, when the fabric sheet is bent, the cross section of the multifilament changes from circular to elliptical, so that the diameter of the yarn in the bending direction decreases and the yarn in the perpendicular direction The diameter increases (becomes elliptical). Thereby, it is said that it is excellent in pliability than a textile sheet containing monofilaments.

  Since the multifilament is loaded with tensile tension in the warp direction when weaving a fabric, the cross section of the warp becomes somewhat oval. Furthermore, the weft yarn is also subjected to some tension in order to knit the weft against the warp which is under tension. Therefore, the cross section of the weft also becomes somewhat elliptical. At this time, the diameter of the warp yarn and weft yarn is the diameter (long diameter) of the oval in the longitudinal direction. However, at the textile stage (in the absence of a thermoplastic elastomer), the cross section of the yarn is not extremely elliptical. At this stage, it is slightly oval, and its shape changes slightly depending on the tension applied to the warp and weft and the production rate. When such a fabric, together with the soft sheet, enters the gap of the heating roll, a compressive force is applied between the two rolls. As a result, the cross section of the yarn in the obtained composite sheet exhibits an oval shape.

  The woven sheet is a woven sheet in which all warps and wefts are made of polyester multifilaments or polyamide multifilaments.

  The woven fabric sheet is excellent in the flexibility of the woven fabric sheet because the thickness of the woven fabric sheet is reduced as compared with the woven fabric sheet consisting only of monofilaments of the same yarn diameter.

  Specifically, all yarns of warp yarns and weft yarns are made into multifilaments made of a predetermined material. By doing this, the cross-sectional shape of each of the warp yarns and wefts at the intersections is at the intersections of the warps and wefts (hereinafter sometimes referred to as "intersections" as appropriate) due to the tensile tension at the time of weaving. It becomes oval. For example, since the multifilament is formed by twisting a plurality of single yarns, the cross section of the multifilament is flattened because the single yarn is displaced along the length direction of the opposite yarn at the intersection of the warp and weft. It has an elliptical shape (not a perfect circle). Therefore, the thickness of the intersection of the warp and weft in the fabric sheet becomes thin due to the flat deformation of the yarn. And since it can be said that the thickness of a textile sheet is equal to the thickness of this intersection part, it can be said that that the thickness of an intersection part becomes thin is synonymous with the thickness of a textile sheet becoming thin. Therefore, when using the same yarn diameter, a fabric sheet using multifilaments is thinner than a fabric sheet consisting of only monofilaments. From another point of view, if the thickness of the woven fabric sheet is the same, a woven fabric sheet using multifilaments can be used with a larger yarn diameter than a woven fabric sheet consisting only of monofilaments, so tear strength etc. The strength characteristics of the

  That is, when the “composite sheet” having the “textile sheet” and the “thermoplastic elastomer” is used as a hinge sheet, the hinge sheet is a hinge having the woven sheet consisting of monofilaments having the same yarn diameter and the thermoplastic elastomer. Compared to the sheet, it has excellent flexibility while having the same strength.

  In addition, when compared with a woven fabric sheet of the same thickness, a multifilament having a yarn diameter larger than that of monofilament yarn can be used, so that the strength of the woven fabric sheet is excellent. This "consisting of fabric sheet and thermoplastic elastomer layer" hinge sheet (composite sheet) has the same flexibility as that of "consisting of fabric sheet and thermoplastic elastomer layer" consisting of monofilaments of the same thickness. But excellent in strength.

  The term "multifilament" refers to 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, "polyester multifilament" is a yarn composed of a plurality of polyester fiber yarns (single yarns). Moreover, a "monofilament" is a yarn which consists of one fiber yarn.

  The woven sheet is not particularly limited, but is preferably a woven sheet composed of at least one weave selected from the group consisting of plain weave and twill weave, and it is a plain weave More preferable. With such a weave, the manufacturing cost is relatively low.

  The thickness of the woven sheet is not particularly limited, and a numerical value in the range corresponding to the application can be selected. For example, the thickness of the electronic passport is determined for each country, but the overall thickness is defined to some extent. And by defining the whole thickness, the thickness of the hinge sheet | seat arrange | positioned in it will also become settled in a certain range. The thickness of the woven sheet is preferably 70 to 150 μm, more preferably 90 to 140 μm, and particularly preferably 100 to 140 μm. When the thickness of the woven sheet is in the above range, there is an advantage that excellent tear resistance is exhibited for the woven sheet, and the resulting composite sheet has excellent flexibility. If the thickness of the woven sheet is less than the lower limit value, 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 resulting 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 in JIS-A, and preferably 70 to 83. When the surface hardness in JIS-A is in the above-described range, the effect of suppressing the generation of wrinkles in the flexibility and the hinge portion is compatible. When the surface hardness is less than the lower limit value, it is difficult to produce a thin sheet like a hinge sheet. If the surface hardness is above the upper limit, the flexibility of the composite sheet can not be obtained sufficiently. In addition, the wrinkles of a hinge part generate | occur | produce as follows. That is, in the heating and laminating step for producing a polycarbonate sheet laminate, the soft resin (thermoplastic elastomer) in the hinge sheet softens and flows out to the hinge part to generate wrinkles. In the electronic passport, the polycarbonate sheet laminate is a data page for storing personal images, numbers, etc. in an IC-Chip and drawing by laser marking.

  "Surface hardness is JIS-A" means "type A" for medium hardness (general rubber etc.) in JIS standard.

  As a thermoplastic elastomer, a thermoplastic polyurethane elastomer, a thermoplastic polyamide elastomer, a thermoplastic polyester elastomer, a thermoplastic acrylic elastomer etc. can be mentioned, for example. These can be used alone or in combination of two or more.

  Furthermore, the thermoplastic elastomer is required to have a difference (ΔYI) in yellowness of 5 or less after 400 hours of test time by the xenon arc test, more preferably 3 or less, and 2 or less. Is particularly preferred. When the difference (ΔYI) in yellowness after a test time of 400 hours by the xenon arc test is 5 or less, the durability can be secured even when used for a long time as in an electronic passport. On the other hand, if the difference in yellowness (ΔYI) after 400 hours of test time by the xenon arc test is more than 5, not only the color changes due to long-term use (that is, due to aging), the color change in light resistance test The strength of the hinge of the data page is reduced because the strength of the thermoplastic elastomer is reduced. Therefore, it is not preferable as a hinge sheet of an electronic passport.

  In the composite sheet of the present invention, the thermoplastic elastomer intrudes into the opening of the woven sheet to close the opening of the woven sheet. In other words, in the composite sheet of the present invention, the filling layer made of thermoplastic elastomer is formed in the opening of the fabric sheet, and the opening of the fabric is closed by the filling layer.

  In the composite sheet of the present invention, an inorganic filler, an organic filler and the like may be mixed within a range that does not impair the function.

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

[1-3] Application of Composite Sheet:
The composite sheet of the present invention can be used as a hinge sheet used in a passport.

[2] Manufacturing 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 of the present invention can have a soft sheet forming step and a softening and intruding step. The soft sheet forming step is a step of forming a soft sheet made of a thermoplastic elastomer by melt extrusion using a T-die equipped extruder. And a softening penetration process includes the softening penetration process A or the softening penetration process B.

  As the softening and infiltrating step A, a metal sheet / rubber roll for heating and cooling (metal roll and rubber roll are used after laminating a soft sheet and a fabric sheet having at least warp and weft and having an opening formed therein. Using a pair of rolls, the soft sheet and the fabric sheet are heated and pressed to soften and infiltrate the thermoplastic elastomer constituting the soft sheet into the opening of the fabric sheet, whereby the fabric sheet and the thermoplastic sheet are made It is a process of manufacturing a composite sheet in which an elastomer is integrated. As the roll, a plurality of metal rolls / metal rolls, metal rolls / rubber rolls and the like can be used. Here, in heating and pressure laminating of a thin sheet (about 20 to 200 μm), a combination of metal roll / rubber roll is generally used, but metal roll / metal roll is also used. In the case of a metal roll / metal roll, the roll gap is narrow due to a thin sheet, and the metal roll is accompanied by thermal expansion of the metal roll in a heated state and a minute roll of roll rotation. A combination of metal roll / rubber roll is common because there is a concern that metal rolls will come into contact in the gap.

  In the softening and intruding step B, a soft sheet in a softened state immediately after being extruded from a T-die-type extruder and a woven sheet having at least warps and wefts and having an opening formed therein are softened. The soft sheet and the fabric sheet are pressure-bonded using a pair of metal rolls. And the thermoplastic elastomer which comprises a soft sheet | seat softens and infiltrates into the opening part of a textile sheet. Thereafter, this composite sheet is made to enter between the next heated metal roll and rubber roll, and the thermoplastic elastomer is made to penetrate to the side opposite to the side where the soft sheet is made to soften and penetrate into the fabric sheet. Then, skin layers of thermoplastic elastomer are formed on both sides of the fabric sheet, and controlled to a predetermined thickness. Thereafter, the composite sheet is introduced between the cooled metal roll and the rubber roll, and the composite sheet is cooled to produce a composite sheet in which the fabric and the thermoplastic elastomer are integrated. However, the arrangement and number of metal rolls and rubber rolls are described above by way of example, and other combinations can naturally be used.

  According to the above manufacturing method, it is excellent in flexibility, repeated bending fatigue durability, light resistance, heat fusion, processability, dimensional accuracy, and further, strength characteristics such as tear resistance and repeated bending durability. Can produce a superior composite sheet.

[2-1] Soft Sheet Forming Process:
As the thermoplastic elastomer, one having a surface hardness of 40 or more and 83 or less in JIS-A can be used, and the same one as the thermoplastic elastomer described in the above-mentioned composite sheet of the present invention can be used.

  As the T-die-equipped extruder, conventionally known ones can be appropriately selected and used. In addition, as the conditions of melt extrusion molding, conventionally known conditions can be appropriately adopted.

[2-2] Softening intrusion process:
As the softening and infiltrating step, for example, any one of the above-mentioned softening and infiltrating steps A and B can be selected.

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

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

[2-2-2] Softening Intrusion Step B:
The “soft sheet in the softened state immediately after being extruded” means that the thermoplastic elastomer intrudes into the opening of the fabric sheet by pressing using a pair of metal rolls, and the thermoplastic elastomer and the fabric sheet are crimped. Means a soft sheet in the

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

  The conditions for pressing using a metal roll are not particularly limited, and conventionally known ones 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 produced soft sheet was measured in accordance with JIS-K7311.
(2) Light resistance:
The sample was treated with a Suga Test Instruments xenon arc tester (black panel temperature = 63 ° C.) for 400 hours, and the change in yellowness (ΔYI) before and after the treatment was measured.

[2] Composite sheet (1) Flexibility:
The composite sheet was cut into a size of width 50 mm × length 200 mm to obtain a sheet test piece A, and the sheet test piece A was placed on the horizontal table 21 shown in FIG. At this time, the sheet test piece A was protruded from the end of the horizontal base 21 with a length of 50 mm (a part in the length direction). Thereafter, the glass plate 22 (width 100 mm, length 200 mm, thickness 3 mm) was placed on the sheet test piece A. Then, the degree of sag (length D) of the overhanging portion of the sheet test piece A was measured. Incidentally, the length D of the sag is, as viewed from the side as shown in FIG. The distance to the farthest part (the tip of the overhanging sheet test piece A) was used. After measurement, the following four evaluations were made.
G1: 25 mm or more "excellent in flexibility"
G2: 20 or more and less than 25 mm "Good flexibility"
B1: 15 or more and less than 20 mm "Insufficient flexibility"
B2: Less than 15 mm "less flexible"

(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, preferably 90 N / mm or more, and more preferably 150 N / mm or more.

(3) Fusion strength:
The composite sheet was cut into a size of length 15 cm × width 15 cm to prepare a sheet test piece B, and four polycarbonate sheets (white) (white polycarbonate resin sheet 31) having a thickness of 200 μm of the same dimension were prepared. Then, these are laminated in order from the bottom into 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, and a lamination test I got a piece. After that, black magic ink was applied to a part of the surface on the side of the sheet test piece B (10 cm from the end) of the polycarbonate sheet (white) 31 placed on the sheet test piece B (in FIG. 3, The black magic ink portion is shown by reference numeral 32). Thereafter, polyimide films 35 were disposed on the upper and lower sides of the lamination test piece, and further, SUS plates 36 were disposed on the upper and lower sides thereof (see FIG. 3). Thereafter, heating and pressing were performed at a heating temperature of 185 ° C. with a vacuum heating and compression molding machine, and then cooling was performed to obtain a heat-laminated test piece. The portion coated with the black magic ink is in a state where the polycarbonate sheet (white) and the sheet test piece B do not fuse, and this portion is used as the pick portion (chuck portion) in the peeling test (180 ° peel test) .

  Thereafter, the heat-laminated test specimen was cut to a width of 20 mm to produce a test specimen for peel test 40. Then, using this test piece for peel test 40, 180 ° peel test was conducted at a test speed of 200 mm / min as shown in FIG. 4 to measure the peel strength (N / mm). This rolling strength was evaluated as fusion strength.

  The repelling strength is preferably as high as possible, specifically 6 N / mm or more.

(4) Wrinkles of sewing machine binding section:
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 for laser marking having a thickness of 100 μm of the same dimension, a white polycarbonate sheet 53 for printing having a thickness of 200 μm of the same dimension, a length of 125 mm A composite sheet 100 having a width of 95 mm, a white polycarbonate sheet 53 for printing having the same dimension of 200 μm, a transparent polycarbonate sheet 52 for laser marking having the same dimension of 100 μm, and a transparent polycarbonate sheet 51 having the same dimension of 100 μm . In addition, the composite sheet 100 was arrange | positioned so that 10 mm may be projected from the polycarbonate sheet laminated body 50 obtained. And this laminated body 50 was arrange | positioned so that it might be pinched | interposed between 200 mm in length, 200 mm in width, 2 mm in thickness SUS board 36, and 200 mm in length, 200 mm in width, 125 micrometers in thickness polyimide film 35, as shown in FIG. . Thereafter, this was heated and pressurized at a heating temperature of 185 ° C. and a pressure of 140 N / mm in a vacuum heating and compression molding machine, and then cooled to obtain a polycarbonate sheet laminate 50 shown in FIG. In the polycarbonate sheet laminate 50, the occurrence of wrinkles in a portion of the composite sheet 100 which protrudes 10 mm from the polycarbonate sheet laminate 50 (sewn stitching portion 100a) was visually observed and evaluated as follows.
W-1: Almost no wrinkles are observed.
W-2: Some occurrence of wrinkles is recognized, but sewing binding is possible without any problem.
W-3: Stitching is difficult due to large wrinkles.

  In the data page of the electronic passport, a hinge sheet protrudes from the polycarbonate sheet laminate, and the cover portion and the visa sheet are sewn together using the protruding portion. Therefore, it is preferable that no occurrence of wrinkles be recognized in the sewing machine binding unit.

Example 1
"Composition sheet (H1)"
First, a soft film (S1) was obtained. Specifically, a polyether-based non-yellowing thermoplastic polyurethane elastomer having surface hardness (JIS-A) 80 (manufactured by BASF Japan Ltd., trade name "Elastol NY 80") is introduced into an extruder with a T-die and brought to 200 ° C. A 60 μm thick soft film (S1) was obtained by melt extrusion molding. The surface hardness and the light resistance were measured using this soft film (S1). The ΔYI value was obtained from the following.

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

  The fabric sheet (F1) used the following fabric sheet. That is, the yarn type was a polyester multifilament, the wire diameter was 83 μm, a 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 fabric sheet (F1), using a heat roll laminating apparatus, the heat roll temperature is compressed to 160 ° C., and a portion of the soft film (S1) (heat The plastic elastomer) was softened into the opening of the fabric sheet (F1), and the thermoplastic elastomer was embedded in the opening of the fabric sheet (F1). Thus, a 110 μm thick composite sheet [H1] 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 polyester multifilament, and "polyamide (multi)" indicates that the yarn type is polyamide multifilament.

(Examples 2 to 6, 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. About the produced composite sheet, various tests were conducted as shown in Tables 1 to 4.

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

  On the other hand, Comparative Example 1 has excellent light resistance, flexibility, and heat fusion bonding strength with a polycarbonate resin sheet, but is inferior in tear strength. Furthermore, Comparative Example 1 has the same wire diameter (83 μm) in comparison with Example 1, but the thickness of the fabric is 130 μm. Therefore, the thickness of the composite sheet using the 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, it can be said that the tear strength of the 140 μm thick composite sheet of Comparative Example 1 is inferior to the 110 μm thick composite sheet of Example 1.

  The total thickness of the electronic passport data page is preferably around 800 μm as in the ID card, and the hinge sheet is preferably as thin as possible if the strength such as tear strength can be maintained constant. From this point of view, the composite sheet of Comparative Example 1 is difficult to put to practical use because it is thick and its tear strength is poor.

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

  In Comparative Example 3, the surface hardness of the thermoplastic elastomer is too low, and therefore, when used as a hinge sheet, large wrinkles occur in the sewing binding portion, so that the processability and the dimensional accuracy are inferior.

  In Comparative Example 4, since the general-purpose type thermoplastic polyurethane elastomer is used, the light resistance is insufficient, and it is difficult to put into practice the hinge sheet for electronic passports that requires long-term durability.

  As described above, the composite sheets of Examples 1 to 10 are excellent in flexibility, repeated bending fatigue durability, light resistance, heat fusion, processability, dimensional accuracy, and strength characteristics such as tear resistance. It has been confirmed that it is excellent. From such a thing, it can use as a hinge seat for passports, etc.

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

11: Textile sheet, 12: Thermoplastic elastomer, 21: Horizontal base, 22: Glass plate, 31: White polycarbonate resin sheet (polycarbonate sheet (white)), 32: Black magic ink portion, 35: Polyimide film, 36: SUS Plate, 40: test piece 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 test piece , B: Sheet specimen, D: Length of sag.

Claims (3)

A composite sheet of a fabric sheet having at least warp and weft threads and having an opening formed therein, and a thermoplastic elastomer excellent in flexibility,
The woven sheet is a woven sheet in which the warp and the weft are all polyester multifilaments or polyamide multifilaments,
The thermoplastic elastomer has a surface hardness of 60 or more and 83 or less according to JIS-A, and a difference (ΔYI) in yellowness after a test time of 400 hours according to a xenon arc test is 5 or less,
A composite sheet in which the thermoplastic elastomer intrudes into the opening of the woven sheet to close the opening of the woven sheet.   The composite sheet according to claim 1, wherein the opening of the fabric sheet is in an area surrounded by the warp and the weft, and a crossing point is provided at a portion where the warp and the weft intersect.   The composite sheet according to claim 1, wherein the woven sheet has a diameter of 60 to 120 μm for each of the warp yarns and the weft yarns, and an opening ratio of 35 to 75%.