Decomposable composite sheet body, forming method of decomposable composite sheet body, smart card and forming method of smart card

Abstract

In various aspects of the disclosure, a decomposable composite sheet, a method of forming a decomposable composite sheet, a smart card, and a method of forming a smart card are provided. In accordance with some illustrative embodiments herein, a smart card includes a decomposable composite sheet comprising a first sheet and a second sheet forming a laminated stack configuration and a core sheet interposed between the first sheet and the second sheet, the first sheet and the second sheet being formed of an organic composite material, the organic composite material includes cellulosic fibers embedded in a lignin matrix. The core sheet includes at least one of a fabric material and a paper material, and the core sheet includes at least one of a fabric material and a paper material.

Description

Technical Field

[0001] The present invention relates to a decomposable composite sheet, a method for forming a decomposable composite sheet, a smart card, and a method for forming a smart card. Background Art

[0002] In the past few decades, plastic products have become more popular in many applications because they are generally manufactured more economically than their non-plastic counterparts. On the other hand, the manufacture of plastic products often has high human and environmental costs. Although the finished plastic may be non-toxic, the monomers used in the manufacture of plastic products may be toxic, and small amounts of these monomers may remain in the finished product. In addition, plastic is a very durable material that degrades very slowly, resulting in a large amount of plastic waste accumulated in the past few decades, and the accumulated plastic waste may persist for hundreds or even thousands of years. In some cases, burning plastic releases toxic fumes. For example, burning polyvinyl chloride (PVC) plastic may produce dioxins. In addition, the manufacture of plastic usually generates a large amount of chemical pollutants, and at least for these reasons, there is an increasing effort to find more environmentally friendly and less toxic plastic alternatives.

[0003] After attempting to develop an environmentally friendly smart card known from document WO 2010 / 039 287A1, a card body formed of a wood material has been developed, in which the card body of the smart card is formed of wood and a magnetic stripe is formed on the back of the card body, while a chip for processing data is integrated into the card body.

[0004] When compared with a smart card formed of a plastic material, the environmentally friendly smart card made of a card body made of wood is sensitive to cracks when the card is bent. When the thickness of the card is increased, the risk of cracking the card when bending the card can be reduced, however, this results in a large-sized card that is not very user-friendly. In other methods of making the wooden smart card less sensitive to cracks when bending the card, a part of the card is replaced with a plastic or metal material, thereby producing a hybrid card (i.e., a card that is no longer mainly wood). Accordingly, the card is no longer environmentally friendly and undermines the effort to avoid plastic materials in smart cards.

[0005] In view of the above, an object is to provide a decomposable composite sheet for a smart card, a method for forming a decomposable composite sheet, a smart card, and a method for forming a smart card, the smart card being environmentally friendly and avoiding plastic materials, while reducing the sensitivity of such environmentally friendly articles to cracks when bent. Summary of the Invention

[0006] In a first aspect of the present disclosure, a decomposable composite sheet is provided. According to illustrative embodiments herein, the decomposable composite sheet includes a first sheet and a second sheet forming a laminated stack configuration and a core sheet interposed between the first sheet and the second sheet, the first sheet and the second sheet being formed of an organic composite material including cellulose fibers embedded in a lignin matrix, wherein the core sheet includes at least one of a fabric material and a paper material. Herein, a decomposable composite sheet refers to a composite sheet formed of such materials that the correspondingly formed composite sheet is at least partially decomposable.

[0007] The corresponding decomposable composite sheet can advantageously be used as a card body of a card such as a document card or an identity card or a smart card, where the decomposable composite sheet is suitable as a card body of a smart card such that a chip module and / or an RFID module and / or a dual interface module, etc. can be integrated or may be integrated into the decomposable composite sheet. In this regard, the first aspect can be considered to represent a card body of a card or a smart card. Herein, since the formation of cracks starting at the internal interface of the stack configuration can be avoided or suppressed by accommodating mechanical tension via the core sheet, the core sheet including at least one of a fabric material and a paper material gives the stack configuration improved flexibility under bending.

[0008] In some illustrative examples of the first sheet and the second sheet formed of an organic composite material including cellulose fibers embedded in a lignin matrix, it can be understood that at least one of the first sheet and the second sheet can be formed of a wood-containing material. Herein, the term wood-containing material can include all wood-containing materials that can be used as starting materials for the production of wood-based materials or solid wood products. Preferred wood-containing materials are wood particles or wood parts such as materials for manufacturing chipboard, OSB panels or other wood materials (fibers, veneer boards) and solid wood parts such as materials for manufacturing solid wood products including glued wood.

[0009] In some illustrative embodiments of the first aspect, the fabric material can include at least one of organic fibers and inorganic fibers. For example, the fabric material can be a wool material or a textile material such as a cotton material or another material based on natural fibers, etc. In this way, an environmentally friendly core sheet can be provided.

[0010] In some illustrative embodiments of the first aspect, the organic composite material may include veneered wood material. Veneered wood is a thin slice of natural wood that is attached to another body of material by gluing or pressing. Wood veneer panels are very affordable and environmentally friendly due to the minimal amount of natural wood. Compared to other types of wood, veneered wood is less prone to splitting and warping, making veneered wood very durable. In the illustrative example, veneered wood may be provided based on at least one of the following types, including fennel, ash, beech (European and American), birch, walnut, cedar, cherry, fir, pecan, holly, monkey fruit wood, maple, oak, pine, poplar, African mahogany, sycamore, and walnut.

[0011] In some illustrative embodiments of the first aspect, the thickness of the core sheet may be less than the thickness of each of the first sheet and the second sheet. For example, the thickness of the core sheet may be two times less than the thickness of each of the first sheet and the second sheet, or even less than two times less. Thus, a thin decomposable composite sheet with improved flexibility when bent can be provided.

[0012] According to some illustrative embodiments of the first aspect, at least one of the upper surface of the first sheet and the bottom surface of the second sheet may be at least partially coated with a sealant, and in the laminated stack configuration, the upper surface of the first sheet and the bottom surface of the second sheet face away from the core sheet.

[0013] According to some illustrative embodiments of the first aspect, the decomposable composite sheet may further include at least one of a first thin sheet and a second thin sheet, each of the first thin sheet and the second thin sheet being formed of a fabric material or a paper material, and at least one of the first thin sheet and the second thin sheet is disposed on the core sheet in such a way that at least one of the first thin sheet and the second thin sheet is between the core sheet and at least one of the first thin sheet and the second thin sheet in the laminated stack configuration. The provision of at least one thin sheet on the outer surface of the decomposable composite sheet improves the crack resistance during bending of the decomposable composite sheet because the thin sheet prevents crack initiation, and the first thin sheet and the second thin sheet of the organic composite material support a higher bending force before cracking.

[0014] According to some illustrative examples herein, the thickness of each of the first thin sheet and the second thin sheet may be less than the thickness of the core sheet. For example, the thickness of the first thin sheet and the second thin sheet may be at least two times less than the thickness of the core sheet. Thus, a thin decomposable composite sheet with high bending flexibility can be provided. Additionally or alternatively, at least one of the first thin sheet and the second thin sheet may be permeated with a sealant. Thus, strong interconnection of the sheets within the laminated stack configuration can be achieved.

[0015] In some illustrative embodiments of the first aspect, the sealant may be cold glue or bone glue or wood glue or a similar environmentally friendly emulsion. For example, the sealant may be one of animal glue, casing glue, urea-formaldehyde glue, phenol-formaldehyde glue, resin-formaldehyde glue, low-formaldehyde polycondensation glue, dispersion glue such as polyvinyl acetate glue, epoxy resin glue, melamine glue, and polyvinyl acetate. Other examples of the sealant may be adhesives, such as PF adhesives (phenoplast), MUPF adhesives (melamine-urea-phenol-formaldehyde), urea-formaldehyde adhesives, abbreviated as UF adhesives, melamine-containing urea adhesives, abbreviated as MUF adhesives, and PMDI adhesives (polymeric diphenylmethane diisocyanate). According to other examples, the sealant may be an adhesive, such as an adhesive including urea-formaldehyde resin (urea resin, urea-formaldehyde => UF), optionally enhanced with melamine or phenol to improve the moisture resistance of the glue joint, or in some cases, the sealant may be isocyanate (polymeric diphenylmethane diisocyanate - PMDI) or in other UF glue systems, where the molar ratio of formaldehyde to urea is increasingly reduced to meet the requirements regarding formaldehyde emissions from wood-based materials.

[0016] In a second aspect of the present disclosure, a method for forming a decomposable composite sheet is provided. According to illustrative embodiments of the second aspect, the method includes stacking a first sheet and a second sheet to form a laminated stack configuration with a core sheet interposed between the first sheet and the second sheet. Herein, the first sheet and the second sheet are formed of an organic composite material including cellulose fibers embedded in a lignin matrix, and the core sheet includes at least one of a fabric material and a paper material.

[0017] According to some illustrative embodiments of the second aspect, the method may further include at least partially depositing a sealant on at least one of the upper surface of the first sheet and the bottom surface of the second sheet, wherein the upper surface of the first sheet and the bottom surface of the second sheet face away from the core sheet in the laminated stack configuration; subsequently applying a penetration treatment that causes the sealant to at least partially penetrate into the core sheet. Thus, a smooth surface of the decomposable composite sheet can be achieved by the sealant filling the irregularities on the surfaces of the first sheet and the second sheet, and a strong interconnection of the sheets in the laminated stack configuration can be achieved.

[0018] According to some illustrative examples of the present disclosure, the penetration treatment may include a hot stamping treatment applied to the laminate stack configuration. For example, the hot stamping treatment may be applied at a temperature greater than 80 °C or greater than 100 °C, such as in the range of about 80 °C to about 180 °C, preferably about 80 °C to about 150 °C or about 100 °C to about 150 °C, or at a temperature greater than 100 °C. In a particular illustrative example herein, a pressure of approximately 5 to 50 kg / cm 2 , preferably 10 to 30 kg / cm 2 may be applied in the hot stamping treatment. For example, the duration of the hot stamping treatment may be a time interval of about 10 s to about 10 minutes, such as about 10 s to about 5 minutes or 30 s to about 5 minutes. Thus, a favorable lamination of sheets with good penetration treatment can be provided.

[0019] According to some illustrative embodiments of the second aspect, the decomposable composite sheet formed in the second aspect may be the decomposable sheet of the first aspect.

[0020] In a third aspect of the present disclosure, a smart card formed from the decomposable composite sheet of the first aspect is provided. In an illustrative embodiment herein, the smart card includes a dual-interface module integrated into the decomposable composite sheet.

[0021] According to some illustrative embodiments of the present disclosure, the dual-interface module may include an antenna wiring structure integrated into the core sheet. In some explicit illustrative examples herein, integrating the antenna wiring pattern structure into the core sheet can be achieved by depositing the antenna wiring structure on the surface of the core sheet, for example, by printing or attaching the wiring structure to the core sheet. Alternatively, the wiring structure can also be buried into the core sheet by a suitable method such as recessing or sewing the wiring into the core sheet.

[0022] In a fourth aspect of the present invention, a method of forming a smart card is provided. In an illustrative embodiment herein, the method includes forming a decomposable composite sheet according to the method of the second aspect and integrating a dual-interface module into the decomposable composite sheet.

[0023] According to some illustrative embodiments of the fourth aspect, the dual-interface module may include an antenna wiring structure integrated into the core sheet before configuring the core sheet into the laminate stack configuration.

[0024] According to some illustrative embodiments of the fourth aspect, the dual-interface module can be integrated into the decomposable composite sheet by forming a recess in the surface of the decomposable composite sheet and implanting the dual-interface module into the recess.

[0025] In the description of the various aspects of the present invention provided above and in the following detailed description, organic fibers are considered to be cellulose fibers derived from wood, rags, grass, or other plant sources, such as cotton webs, etc. In addition, inorganic fibers can be provided by polyester or environmentally friendly plastics, such as recycled polyester, PVC, bio-PVC, PET-G, or any other type of environmentally friendly plastic such as bioplastics. Some examples of bioplastics include starch-based plastics, polylactic acid (PLA) plastics, poly-3-hydroxybutyrate (PHB) plastics, polyamide 11 (PA11) plastics, bio-derived polyethylene plastics, and commonly modified bioplastics.

[0026] Although only one first sheet and one second sheet are disclosed in the context of the various aspects of the present disclosure, this does not impose any limitation on the aspects, and it should be understood that the first sheet and the second sheet can explicitly refer to representing multiple sheets of an organic composite material containing cellulose fibers embedded in a lignin matrix, the multiple sheets being composed of at least two sheets (i.e., the first sheet and the second sheet) and optionally one or more additional sheets (i.e., the third sheet, the fourth sheet, the fifth sheet, the sixth sheet, etc.). Any suitable number of sheets greater than two can be implemented in the decomposable composite sheet body. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In the drawings, the same reference numerals generally refer to the same features in different drawings. Moreover, the drawings are not necessarily drawn to scale; instead, the emphasis is generally on illustrating the principles of the present disclosure. The embodiments of the present disclosure will now be described by way of example only with reference to the following drawings, in which:

[0028] Figure 1 Schematically shows an initial stage of a process applied during the manufacture of a decomposable composite sheet according to some illustrative embodiments of the present disclosure,

[0029] Figure 2 Schematically shows, according to some illustrative embodiments of the present disclosure, Figure 1 a subsequent stage after the stage shown,

[0030] Figure 3 Schematically shows, in a cross-sectional view, the decomposable composite sheet after the completion of Figure 2 the process shown,

[0031] Figure 4 Schematically shows, in an exploded view, a smart card according to some illustrative embodiments of the present disclosure,

[0032] Figure 5a Schematically shows, according to some illustrative embodiments of the present disclosure, Figure 4 a top view of the smart card shown,

[0033] Figure 5b Schematically shows according to some illustrative embodiments of the present disclosure Figure 4 The bottom view of the smart card shown, and

[0034] Figure 6 Schematically shows in cross-section a decomposable composite sheet according to some illustrative embodiments of the present disclosure. Detailed implementation manners

[0035] According to various illustrative embodiments described below with reference to the drawings, a decomposable composite sheet is provided, which can be used as the card body of a smart card. Therefore, in order to manufacture a desired card or smart card based on the decomposable composite sheet, the decomposable composite sheet can be subjected to further processing.

[0036] Regarding Figures 1 to 3 , the processing of the decomposable composite sheet 1 is described below. Figure 1 Shows the decomposable composite sheet 1 in an initial stage during the processing of the decomposable composite sheet 1. The decomposable sheet according to the first aspect disclosed above provides the decomposable sheet 1.

[0037] Continuing to refer to Figure 1 , a sealant 8 is deposited on at least one surface of the decomposable composite sheet 1. For example, the sealant 8 can be formed on the upper surface or the opposite bottom surface of the decomposable sheet 1, and the upper surface and the bottom surface are perpendicular to the thickness direction of the sheet (the thickness direction is associated with the direction in which the sheets in the decomposable composite sheet are stacked to obtain a laminated stack configuration of the sheets in the decomposable composite sheet).

[0038] According to some illustrative examples herein, by uniformly distributing the sealant 8 on the entire surface a of the decomposable composite sheet 1, the sealant 8 can be deposited on the upper surface a of the decomposable composite sheet. For example, a drop of sealant can also be deposited on the surface a of the decomposable composite sheet 1, and the dropped sealant 8 is uniformly dispersed on the surface a of the decomposable composite sheet by a dispersion tool c. The dispersion tool c can be a putty knife, a spatula, a scraper or a roller tool, which is configured to uniformly spread and disperse a large amount of deformable material onto the surface.

[0039] Alternatively or additionally, the corresponding treatment can also be performed on the surface b to uniformly spread the sealant 8 on the surface b of the decomposable composite sheet.

[0040] In addition, as Figure 1The decomposable composite sheet 1 shown may include at least a first sheet and a second sheet of an organic composite material, and the first sheet and the second sheet are configured in a laminated stack configuration such that a core sheet is interposed between at least one of the first sheet and the second sheet. At least one of the first sheet and the second sheet of the organic composite material may include a material formed of cellulose fibers embedded in a lignin matrix. The core sheet may include at least one of a fabric material and a paper material.

[0041] According to some illustrative embodiments of the present disclosure, as in Figure 1 the stages shown, each sheet of the decomposable composite sheet 1 provided before depositing the sealant 8 may be fixed together by an adhesive layer formed between each of the first sheet and the second sheet and the core sheet. This is not a limitation to the present disclosure, and in Figure 1 the initial state, before depositing the sealant 8 on the decomposable composite sheet 1, at least one of the first sheet and the second sheet and the core sheet may be stacked loosely with each other.

[0042] According to some illustrative embodiments of the present disclosure, the core sheet of the decomposable composite sheet may be equipped with an antenna wiring structure, that is, an antenna of an RFID transmitting device and / or a magnetic stripe. However, this is not a limitation to the present disclosure and the core sheet may not be equipped with any electrical and / or magnetic structures.

[0043] Referring to Figure 2 , the decomposable composite sheet 1 in a subsequent stage during processing is schematically shown, wherein the decomposable composite sheet 1 is disposed between two platen plates 9 of a pressing tool, and the pressing tool is configured to apply at least mechanical pressure to the decomposable composite sheet 1 disposed therebetween.

[0044] The decomposable composite sheet 1 disposed in the pressing tool has the sealant 8 dispersed on the surfaces a and b of the decomposable composite sheet 1 after the stage shown in Figure 1 .

[0045] According to some illustrative embodiments of the present disclosure, the pressing tool applies mechanical pressure to the decomposable composite sheet 1 via the platen plates 9. The mechanical pressure may be in the range of approximately 10 to 30 kg / cm 2 . According to some illustrative embodiments, the pressure may be maintained for approximately 30 seconds to approximately 10 minutes, preferably approximately 30 seconds to approximately 5 minutes, and more preferably approximately 30 seconds to approximately 4 minutes. Optionally, the pressing tool may be configured to apply heat to the decomposable composite sheet during the pressing process, wherein the heat may be in the range of approximately 50 °C to 100 °C, such as 80 °C to 150 °C, and more preferably 100 °C to 150 °C. Therefore, the pressing tool may be configured to perform a hot stamping process on the decomposable composite sheet 1.

[0046] Referring to Figure 3, showing a cross-sectional view of the decomposable composite sheet 1 after the end of the hot stamping process. Figure 3 The schematic cross-sectional view in Figure 3 is not drawn to scale and shows the unevenness 2 in the surfaces a and b of the decomposable composite sheet 1 in an enlarged form. As Figure 2 schematically shown, the surfaces a and b are smooth after the pressure treatment disclosed above, and the sealant 8 fills the unevenness 2 in the surfaces a and b of the decomposable composite sheet 1. As a result, after completing the above-mentioned Figure 1 and Figure 2 processing, the decomposable composite sheet 1 has smooth surfaces SUS and SBS.

[0047] According to some illustrative embodiments, the sealant 8 not only smooths the surfaces a and b to produce smooth surfaces SUS and SBS as shown in Figure 3 , but it can also penetrate into the decomposable composite sheet 1 during the Figure 2 described processing, thereby achieving strong interaction between the sheets in the decomposable composite sheet, such that a solid decomposable composite sheet 1 is produced by the above-mentioned Figure 1 and Figure 2 described processing.

[0048] Referring to Figure 4 , a smart card 10 is schematically illustrated in an exploded view according to some illustrative embodiments of the present disclosure. The smart card 10 can be formed based on the decomposable composite sheet 1 as described above with respect to Figures 1 to 3 .

[0049] Continuing to refer to Figure 4 , the smart card 10 includes a laminated stack configuration of a core sheet 14 between a first sheet 11 and a second sheet 12. The core sheet 14 can have an antenna wiring structure 14a integrated into the core sheet 14. For example, the antenna wiring structure 14a can be printed on the core sheet 14 or the antenna wiring structure 14a can be embedded in the core sheet 14.

[0050] According to some illustrative embodiments of the present disclosure, the core sheet 14 can include at least one of a fabric material and a paper material. For example, the core sheet 14 can be formed of a fabric material to which the antenna wiring structure 14a is attached or in which the antenna structure 14a is stitched. Alternatively, the core sheet 14 can be formed of a paper material on which the antenna wiring structure 14a is mounted or in which the antenna wiring structure 14a is embedded. Although not shown, the antenna wiring structure 14a can be electrically connected to an RFID chip such that the antenna wiring structure 14a and the RFID chip form an RFID device.

[0051] According to some specific illustrative but non - limiting examples, the core sheet 14 can be formed by inserting the antenna wiring structure 14a between two pieces of fabric material or paper material, or between a piece of paper material and a piece of fabric material.

[0052] Continuing to refer to Figure 4 , the first sheet 11 and the core sheet 14 can be attached to each other via the adhesive layer 13a. For example, the adhesive layer 13a can be an environmentally friendly glue.

[0053] Similarly, the second sheet 12 can be attached to the core sheet 14 by means of the environmentally friendly glue 13b.

[0054] According to some illustrative embodiments, when the card body of the smart card 10 is subjected to the processing as described above with respect to Figures 1 to 3 , the adhesive layers 13a and 13b can be provided by a sealant, where the sealant penetrates into the card body, particularly penetrating the first sheet 11 and the second sheet 12 to at least reach (if not at least partially penetrate) the core sheet 14, thereby forming the adhesive layers 13a and 13b.

[0055] Referring to Figure 5a , a top view of the smart card 10 is schematically illustrated. The top view shows the top view of the first sheet 11 of the smart card 10, where, for example, the card module of the ISO module 24 is integrated into the smart card 10. Alternatively or additionally, the printed portion 21 is provided on the surface of the first sheet 11 such that the smart card 10 can be personalized by printing information individually onto the first sheet 11. However, this does not impose any limitation on the present disclosure, and those skilled in the art will understand that either one of the module 24 and the region 21 is optional.

[0056] Referring to Figure 5b , a bottom view of the smart card 10 is schematically illustrated, which shows a plan view of the second sheet 12. The Figure 5b bottom surface shown of the second sheet 12 can be personalized by either the printed portion 25b or the hologram portion 25a to increase the security of the smart card 10. Alternatively or additionally, a magnetic stripe 26 can be provided in the second sheet 12. For example, the second sheet 12 can be recessed and the magnetic stripe 26 can be inserted into the recess such that the bottom surface of the second sheet 12 is a smooth and flush surface. However, this does not impose any limitation on the present disclosure, and those skilled in the art will understand that either one of the magnetic stripe 26 and the personalized printing 25a, 25b is optional.

[0057] Referring to Figure 4 , the smart card 10 can be provided by providing according to the above with respect to Figure 3The decomposable composite sheet 1 is formed by integrating a decomposable composite sheet and integrating a dual-interface module such as an ISO module 24 into the decomposable composite sheet. In addition, the decomposable composite sheet can be personalized according to the printed portion 21 on the first sheet 11 and / or the magnetic stripe 26 and / or personalizations 25a and 25b on the second sheet 12. This does not impose any limitation on the present disclosure, and those skilled in the art will understand that a smart card 10 can be provided without the dual-interface module 24.

[0058] Referring Figure 6 , a cross-sectional view schematically illustrates the decomposable composite sheet 1'. Figure 6 The cross-sectional view in

[0059] The decomposable composite sheet 1' includes the core sheet 14 as described above, the adhesive layers 13a and 13b as described above, and the first sheet 11 and the second sheet 12 as described above. According to the decomposable composite sheet 1 as described above, a laminated stack configuration including the core sheet 14 and the first sheet 11 and the second sheet 12 can be formed.

[0060] According to some illustrative examples herein, the first sheet 11 and the second sheet 12 can be formed of cherry wood veneer, while the core sheet 14 can be formed of a cotton web. However, this does not impose any limitation on the present disclosure, and suitable different materials can be alternatively employed.

[0061] According to some illustrative embodiments of the present disclosure, the core sheet 14 can have an antenna wiring structure corresponding to the antenna wiring structure 14a integrated in the core sheet as described above with respect to Figure 4 .

[0062] Continuing to refer Figure 6 , the laminated stack configuration formed by the core sheet 14 and the first sheet 11 and the second sheet 12 can further include thin sheets 32a and 32b attached to the first sheet 11 and the second sheet 12 via adhesive layers 31a and 31b. In addition, smooth surfaces 33a and 32b similar to the smooth surfaces SUS and SBS as described above with respect to Figure 3 can be provided.

[0063] According to some illustrative embodiments of the present disclosure, the thickness of the thin sheets 32a and 32b can be less than the thickness of the core sheet 14. For example, the thickness of the thin sheets 32a, 32b can be at least two times less than the thickness of the core sheet 14. The thin sheets 32a and 32b can be formed of the same material as the core sheet 14, or can be formed of different materials including at least one of a fabric material and a paper material.

[0064] In subjecting Figure 6 the decomposable composite sheet 1' to the above with respect to Figure 4 , Figure 5a andFigure 5b When personalizing as described above, it can be similar to the description of the presentation of the smart card 10 in the context of Figure 4 、 Figure 5a and Figure 5b such that the smart card is formed by the decomposable composite sheet 1'.

[0065] For example, after providing the decomposable composite sheet 1', a cavity can be formed in the decomposable composite sheet 1' to form a cavity for accommodating a dual-interface module (not shown) in the post-implantation process. For example, the recess and implantation of the dual-interface cavity can enable the antenna wiring structure (not shown) to be in electrical contact in the decomposable composite sheet 1'.

[0066] In various illustrative embodiments of the present disclosure as described herein, a sealant is employed. The sealant can be given by adhesives that can be used in the field of producing wood-based materials or adhesives or adhesive mixtures suitable for solid wood products, such as wax, resin, glue, cement emulsion, PF adhesives (phenolic plastics), MUPF adhesives (melamine-urea-phenol-formaldehyde), UF adhesives (urea-formaldehyde adhesives), MUF adhesives (urea-formaldehyde adhesives containing melamine), and PMDI adhesives (polymeric diphenylmethane diisocyanate). For example, adhesives and / or adhesive mixtures of the following adhesive categories can be preferably used:

[0067] Phenolic resin (PF)

[0068] Phenolic resin (PF) represents an important group in the field of wood adhesives. PF resins are mainly used for waterproof and weather-resistant gluing. The advantages of using PF glue are, on the one hand, low to almost no formaldehyde emissions, and on the other hand, low thickness swelling. However, compared to aminoplastic resins, PF resins cure more slowly. The produced wood-based materials have a darker color due to the dark glue joints, which is visible when using very light-colored veneers. The phenol used can be condensed and cross-linked with formaldehyde in both the alkaline and acidic ranges. A distinction is made between alkaline-hardening phenols as soluble phenolic resins and acidic-hardening phenols as phenolic varnishes. Only alkaline-hardening phenols are used in the wood-based materials industry. Phenolic resin glue is an aqueous alkaline solution composed of oligomeric to polymeric chains. The alkaline pH value can cause problems when coating these wood-based materials and when using different types of acidic woods.

[0069] PMDI adhesives

[0070] Isocyanate-based PMDI adhesives differ from UF and PF resins. Isocyanates are not condensation resins but are based on polymethylene diisocyanate (PMDI) and are mainly used in the production of wood-based materials for wet areas and for "formaldehyde-free" plywood. PMDI is particularly suitable as an adhesive for difficult-to-bond annual plants such as, for example, B. straw and bagasse. PMDI has very high adhesive properties, but this makes it extremely difficult to handle because it reacts not only with the wood surface. When isocyanates are used as adhesives, various basic reactions can occur. These include reactions with water, with the hydroxyl groups of cellulose and hemicellulose and other carbohydrates, with the hydroxyl groups of lignin and tannins, and with the COOH groups of polygalacturonic acid, uronic acid, and lignin.

[0071] Urea-formaldehyde resin (UF)

[0072] UF resins are the most important aminoplastic adhesives in the wood-based materials industry. These adhesives have amino groups (-NH2) in the form of amine bonds (R-NH2) or amide bonds (R-CO-NH2). UF resins are easy to handle and not complex to process. They can be cold-bonded and hot-glued and can be combined with other adhesive systems. After pressing, the hardened glue joints have hard plasticity and high glue strength. Compared with other adhesives, the special advantage of UF resins is their colorlessness and low price. However, the use of UF resins is not without problems. On the one hand, wood-based materials made with UF resins are insensitive to the effects of moisture and water, and on the other hand, formaldehyde is released during processing and later use of the wood-based materials. To reduce the sensitivity to moisture, melamine and sometimes also phenol are now incorporated into UF resins. By significantly reducing the molar ratio between formaldehyde and urea, formaldehyde emissions can be significantly reduced.

[0073] Melamine and melamine mixed resins (MF) Like UF resins, melamine resins also belong to the group of aminoplastics.

[0074] For cost reasons, pure melamine resins are not used at all. They are usually used as impregnating and soaking resins. However, it is common to add melamine to other resins. By adding melamine, the limited hydrolysis resistance of cured UF resins can be improved, and thickness swelling is reduced. Melamine-urea-formaldehyde resins (MUF) differ from pure UF resins in that they have higher moisture resistance and the ability to cure at temperatures above 130 °C without a special catalyst. In addition to this glue, the most common mixed resins are melamine-urea-phenol-formaldehyde resins (MUPF) and phenol-melamine resins (PMF).

[0075] Adhesives based on renewable raw materials such as, for example, B. tannins

[0076] Tannins are plant polyhydroxyphenols (tannins) that are soluble in water, alcohol, and acetone. Tannins are mainly obtained by extraction from wood, bark, leaves, and fruits. There has been a great deal of research on the use of mimosa bark extract and various pine bark extracts. Chemically, tannins are divided into hydrolysable and condensed types. Tannins are used as adhesives, in combination with formaldehyde components as crosslinking agents or with amino or phenolic resins.

[0077] Gluten glue

[0078] Gelatin is a natural glue made from waste skin, leather, or bone.

[0079] Casein glue

[0080] This glue is composed of milk and lime.

[0081] Resorcinol formaldehyde resin glue (also RF glue)

[0082] It consists of a liquid glue and a powder hardener.

[0083] Low-formaldehyde polycondensation glue

[0084] Formaldehyde is required to harden the glue resin. In most cases, the formaldehyde content is higher than that of other resin components to ensure good curing (stoichiometric excess). However, with this polycondensation glue, the reduction of free formaldehyde is achieved by adding a formaldehyde scavenger or reducing the formaldehyde content achieved.

[0085] Formaldehyde-free dispersion glue

[0086] The well-known white glue is a formaldehyde-free dispersion glue, with PVAC (polyvinyl acetate) as the adhesive, ready to use as a dispersion in water, and can be used as a cold glue, quick adhesive, veneer glue, hardening glue, varnish glue, and hot glue. It is available in stress groups D2 - D3. For D4 gluing, D3 glue is required, and a hardener is added to the D3 glue before use. There is also D2 glue that achieves D4 quality by adding a hardener.

[0087] PU glue

[0088] The most modern adhesives in the wood industry today are one-component PU adhesives (polyurethanes). They are waterproof (D4) and bond not only wood, but almost all bondable materials. These are solvent-free reactive adhesives that harden with the help of moisture. Suitable solvents are those into which the desired adhesive, antioxidant and / or preservative of the solution and optionally other components can be introduced sufficiently well (optionally with the aid of an emulsifier) and that are suitable for the wood-containing starting materials. These solvents are, for example, water and / or other organic solvents such as ethanol. Suitable solvents include mixtures of water and organic solvents, such as mixtures containing ethanol or mixtures containing different organic solvents. Suitable solvents are known to the person skilled in the art. In particular, the finished solution containing at least one adhesive and at least one antioxidant or at least one preservative (with or without an emulsifier) can be an aqueous solution or a dispersant. However, it can also be an oily or oily solution. The antioxidant and / or preservative can be emulsified, suspended and / or dispersed in the solution. Wetting the wood-containing starting materials with a solution containing at least one adhesive and at least one antioxidant or at least one preservative can be carried out by any method known to the person skilled in the art that is suitable for bringing the wood-containing starting materials into contact with a solution containing at least one adhesive and at least one antioxidant or at least one preservative.

[0089] When applying the sealant, suitable methods can be employed, such as the suitable gluing treatment as described above with respect to Figure 1 or alternatively using spraying, coating, dipping or other methods for applying the solution (for example, also adding B. in MDF production during steaming). Details regarding suitable sealants in wood processing are described, for example, in the document WO 2009 / 156258A1, the disclosure of which is incorporated herein by reference in its entirety, in particular the disclosure regarding the adhesives and gluing disclosed above in document WO 2009 / 156 258A1 is incorporated herein by reference in its entirety.

Claims

1. A decomposable composite sheet, comprising a first sheet and a second sheet forming a laminated stack configuration, and a core sheet interposed between the first sheet and the second sheet, wherein the first sheet and the second sheet are formed of an organic composite material including cellulose fibers embedded in a lignin matrix, and wherein the core sheet includes at least one of a fabric material and a paper material.

2. The decomposable composite sheet according to claim 1, wherein, The fabric material includes at least one of organic fibers and inorganic fibers.

3. The decomposable composite sheet according to claim 1 or 2, wherein, The organic composite material includes veneered wood material.

4. The decomposable composite sheet according to any one of claims 1 to 3, wherein, The thickness of the core sheet is less than the thickness of each of the first sheet and the second sheet.

5. The decomposable composite sheet according to any one of claims 1 to 4, wherein, At least one of the upper surface of the first sheet and the bottom surface of the second sheet is at least partially coated with a sealant, and the upper surface of the first sheet and the bottom surface of the second sheet face away from the core sheet in the laminated stack configuration.

6. The decomposable composite sheet according to any one of claims 1 to 5, further comprising at least one of a first thin sheet and a second thin sheet, each of the first thin sheet and the second thin sheet being formed of a fabric material or a paper material, and at least one of the first thin sheet and the second thin sheet being disposed on the core sheet in the laminated stack configuration such that at least one of the first sheet and the second sheet is interposed between the core sheet and at least one of the first thin sheet and the second thin sheet.

7. The decomposable composite sheet according to claim 6, wherein, The thickness of each of the first thin sheet and the second thin sheet is less than the thickness of the core sheet.

8. The decomposable composite sheet according to claim 6 or 7 in combination with claim 5, wherein, At least one of the first thin sheet and the second thin sheet is penetrated by the sealant.

9. A method for forming a decomposable composite sheet, the method comprising: Forming a laminated stack configuration by stacking the first sheet and the second sheet with the core sheet interposed between them, wherein the first sheet and the second sheet are formed of an organic composite material including cellulose fibers embedded in a lignin matrix, and wherein the core sheet includes at least one of a fabric material and a paper material.

10. The method according to claim 9, further comprising: At least partially depositing a sealant on at least one of the upper surface of the first sheet and the bottom surface of the second sheet, wherein the upper surface of the first sheet and the bottom surface of the second sheet face away from the core sheet in the laminated stack configuration; And subsequently, Applying a penetration treatment to cause the sealant to at least partially penetrate into the core sheet.

11. The method according to claim 10, wherein, The penetration treatment includes a hot press stamping treatment applied to the laminated stack configuration.

12. The method according to any one of claims 9 to 11, wherein, Forming the decomposable composite sheet according to any one of claims 1 to 8.

13. An intelligent card formed of the decomposable composite sheet according to any one of claims 1 to 8, the intelligent card further including a dual interface module integrated into the decomposable composite sheet.

14. The smart card according to claim 13, wherein, The dual interface module includes an antenna wiring structure integrated into the core sheet.

15. A method for forming an intelligent card, the method comprising: Forming a decomposable composite sheet according to the method according to any one of claims 9 to 12; And Integrating a dual interface module into the decomposable composite sheet.

16. The method according to claim 15, wherein, The dual-interface module includes an antenna wiring structure integrated into the core chip before the core chip is configured in the laminated stack configuration.

17. The method according to claim 15, wherein The dual-interface module is integrated into the decomposable composite sheet by forming a recess in the surface of the decomposable composite sheet and implanting the dual-interface module into the recess.

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