Decomposable composite sheet body, method of forming a decomposable composite sheet body, a smartcard, and method of forming a smartcard

Abstract

In various aspects of the present disclosure, a decomposable composite sheet body, a method of forming a decomposable composite sheet body, a smartcard, and a method of forming a smartcard are provided. According to some illustrative embodiments herein, a smart card comprises a decomposable composite sheet body, comprising a first and second sheet of organic composite material comprising cellulose fibers embedded in a matrix of lignin, and a core sheet interposed between the first and second sheets forming a laminated stacking arrangement. The core sheet comprises at least one of a fabric material and a paper material and the core sheet comprises at least one of a fabric material and a paper material.

Description

[0001] Decomposable composite sheet body, method of forming a decomposable composite sheet body, a smartcard, and method of forming a smartcard

[0002] Field of the Invention

[0003] The present invention relates to a decomposable composite sheet body, a method of forming a decomposable composite sheet body, a smartcard, and a method of forming a smartcard.

[0004] Background

[0005] Over the last decades, plastic products became more popular in many applications as plastic products are often more economical to manufacture than corresponding counterparts using non-plastic materials. On the other hand, the manufacture of plastic products tends to have higher human and environmental costs. While finished plastic may be non-toxic, monomers used in the manufacture of plastic products may be toxic and small amounts of these monomers may remain trapped in the finished products. Furthermore, plastic is a very durable material that degrades very slowly such that a great amount of plastic garbage has accumulated over the last decades and the accumulated plastic garbage may persist for hundreds or even thousands of years. In some cases, burning plastics can release toxic fumes, for example, burning plastic polyvinylchloride (PVC) may create dioxin. Furthermore, the manufacturing of plastics often creates large quantities of chemical pollutants and for at least these reasons, there is an increasing effort made to find plastic alternatives that are more environmentally friendly and less toxic.

[0006] Following attempts to develop an environmentally friendly smartcard as known from document WO 2010 / 039 287 A1 , a card body formed of wood material has been developed where the card body of the smartcard is formed from wood and a magnetic strip is formed on the backside of the card body, while a chip for processing data is integrated into the card body.

[0007] When compared to smartcards formed of plastic material, an ecofriendly smartcard manufactured from a card body made from wood is sensitive to cracks when bending the card. The risk of cracking the card upon bending the card can be reduced when increasing the thickness of the card, however, resulting in bulky cards that are not very user friendly. In other approaches to make a wooden smartcard less sensitive to cracks while bending the card is to replace part of the card with plastic or metal material, thereby creating a hybrid card (i.e. a card that is not mainly wood anymore). According cards are not ecofriendly anymore and undermine the efforts to avoid plastic material in smartcards. In view of the above-described situation it is an objective to provide a decomposable composite sheet body for a smartcard, a method of forming a decomposable composite sheet body, a smartcard, and a method of forming a smartcard that is ecofriendly and avoids plastic material while reducing the sensitivity of such an ecofriendly item to crack when bending.

[0008] Summary

[0009] In a first aspect of the disclosure, a decomposable composite sheet body is provided. In accordance with illustrative embodiments herein, the decomposable composite sheet body comprises a first and second sheet of organic composite material comprising cellulose fibers embedded in a matrix of lignin, and a core sheet interposed between the first and second sheets forming a laminated stacking arrangement, wherein the core sheet comprises at least one of a fabric material and a paper material. Herein, a decomposable composite sheet body means a composite sheet body formed of such materials that the accordingly formed composite sheet body is at least partially decomposable.

[0010] An according decomposable composite sheet body may be advantageously employed as a card body of a card, such as a document card or an identity card, or a smartcard, where the decomposable composite sheet body is suitable as a card body of a smartcard such that a chip module and / or an RFID module and / or a dual interface module and the like, is or may be integrated into the decomposable composite sheet body. In this regard, the first aspect may be considered as representing a card body of a card or a smartcard. Herein, the core sheet comprising at least one of a fabric material and a paper material equips the stacking arrangement with an improved flexibility under bending in that the formation of cracks starting at the interior interfaces of the stacking arrangement may be avoided or suppressed by accommodating mechanical tension via the core sheet.

[0011] In some illustrative examples of the first and second sheets as being formed of an organic composite material comprising cellulose fibers embedded in a matrix of lignin may be understood such that at least one of the first and second sheets may be formed of a woodcontaining material. Herein, the term wood-containing material may comprise all woodcontaining materials that can be used as starting material for the production of wood-based materials or solid wood products. Preferred wood-containing materials are wood particles or wood parts, such as materials that are used in the manufacture of chipboard, OSB panels or other wood materials (fiber, carpentry veneer boards) and solid wood parts, such as materials that are used in the manufacture of solid wood products comprising glued wood. In some illustrative embodiments of the first aspect, the fabric material may comprise at least one of organic and inorganic fibers. For example, the fabric material may be a fleece material or a textile material such as a cotton material or another material based on natural fibers and the like. In this way, an ecofriendly core sheet may be provided.

[0012] In some illustrative embodiments of the first aspect, the organic composite material may comprise veneer wood material. Wood veneer is a thin slice of natural wood attached through gluing or pressing to another material body. Wood veneer sheets are very affordable due to a minimal amount of natural wood and environmentally friendly. In comparison to other types of wood, wood veneer is less prone to splintering and warping, thereby making wood veneer very durable. In illustrative examples, wood veneer may be provided on the basis of the following types comprising at least one of Anigre, Ash, Beech (European & American), Birch, Butternut, Cedar, Cherry, Fir, Hickory, Holly, Makore, Maple, Oak, Pine, Poplar, Sapele, Sycamore, and Walnut.

[0013] In some illustrative embodiments of the first aspect, a thickness of the core sheet may be smaller than a thickness of each of the first and second sheets. For example, the thickness of the core sheet may be two times smaller than the thickness of each of the first and second sheets or even smaller than two times smaller. Accordingly, a thin decomposable composite sheet body with improved flexibility under bending may be provided.

[0014] In accordance with some illustrative embodiments of the first aspect, at least one of an upper surface of the first sheet and a bottom surface of the second sheet may be at least partially coated with a sealing agent, the upper surface of the first sheet and the bottom surface of the second sheet facing away from the core sheet in the laminated stacking arrangement.

[0015] In accordance with some illustrative embodiments of the first aspect, the decomposable composite sheet body may further comprise at least one of a first thin sheet and a second thin sheet, each of which being formed by a fabric material or a paper material, the at least one of the first thin sheet and the second thin sheet being arranged over the core sheet in the laminated stacking arrangement such that at least one of the first and second sheets is interposed between the core sheet and the at least one of the first thin sheet and the second thin sheet. Providing at least one thin sheet on an outer surface of the decomposable composite sheet body improves the crack resistivity during bending of the decomposable composite sheet body as the thin sheet prevents crack initiation and the first and second sheets of organic composite material support a higher bending force before cracking. In accordance with some illustrative examples herein, a thickness of each of the first and second thin sheets may be smaller than a thickness of the core sheet. For example, the first and second thin sheets may be at least two times smaller than the core sheet regarding its thickness. Accordingly, a thin decomposable composite sheet body with high bending flexibility may be provided. Additionally or alternatively, the at least one of the first thin sheet and the second thin sheet may be permeated by the sealing agent. Accordingly, a strong interconnection of the sheets within the laminated stacking arrangement may be achieved.

[0016] In some illustrative embodiments of the first aspect, the sealing agent may be a cold glue or bone glue or wood glue or a similar ecofriendly emulsion. For example, the sealing agent may be one of animal glue, casing glue, urea formaldehyde glue, phenol formaldehyde glue, resin formaldehyde glue, low-formaldehyde poly condensation glue, dispersion glue such as polyvinyl acetate glue, epoxy resin glue, melamine glue, and polyvinyl acetate. Other examples of the sealing agent may be given by adhesives such as PF adhesives (phenoplast), MLIPF adhesives (melamine-urea-phenol-formaldehyde), urea-formaldehyde adhesive, LIF adhesive for short, melamine-containing urea adhesives, MUF adhesives for short and PMDI adhesives (Polymeric diphenylmethane diisocyanate). According to other examples, the sealing agent may be a gluing agent such as a gluing comprising Urea-formaldehyde resins (urea resin, urea-formaldehyde => UF), optionally reinforced with melamine or phenol to improve the moisture resistance of the glue joint, or in some cases isocyanates (polymeric diphenylmethane diisocyanate - PMDI) or in other UF glue systems where the molar proportion of formaldehyde compared to urea is reduced more and more in order to comply with the requirements regarding formaldehyde emissions from wood-based materials.

[0017] In a second aspect of the present disclosure, a method of forming a decomposable composite sheet body is provided. In accordance with the illustrative embodiments of the second aspect, the method comprises forming a laminated stacking arrangement by stacking a first sheet and a second sheet with a core sheet interposed between the first and second sheets. Herein, the first and second sheets are formed of an organic composite material comprising cellulose fibers embedded in a matrix of lignin, and the core sheet comprises at least one of a fabric material and a paper material.

[0018] In accordance with some illustrative embodiments of the second aspect, the method may further comprise depositing a sealing agent at least partially on at least one of an upper surface of the first sheet and a bottom surface of the second sheet, wherein the upper surface of the first sheet and the bottom surface of the second sheet are facing away from the core sheet in the laminated stacking arrangement; and subsequently applying a permeating process for permeating the sealing agent at least partially into the core sheet. Accordingly, a smooth surface of the decomposable composite sheet body may be achieved by the sealing agent which fills unevenness in the surface of the first and second sheets, as well as a strong interconnection of the sheets in the laminated stacking arrangement maybe achieved.

[0019] In accordance with some illustrative examples herein the permeating process may comprise a hotpress stamp process applied to the laminated stacking arrangement. For example, the hotpress stamp process may be applied at temperatures greater than 80°C or greater than 100°C, such as in a range from about 80°C to about 180°C, preferably about 80°C to about 150°C or about 100°C to about 150°C, or greater than 100°C, for example. In special illustrative examples herein, a pressure of approximately 5 - 50 kg / cm2, preferably 10 - 30 kg / cm2, may be applied during the hotpress stamp process. For example, a duration of the hotstamp press process may be in 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 min. Accordingly, an advantageous lamination of the sheets with a good permeating process may be provided.

[0020] In accordance with some illustrative embodiments of the second aspect, the decomposable composite sheet body formed in the second aspect may be the decomposable sheet body of the first aspect.

[0021] In a third aspect of the present disclosure, a smart card formed of the decomposable composite sheet body of the first aspect is provided. In the illustrative embodiments herein, the smart card comprises a dual interface module integrated into the decomposable composite sheet body.

[0022] In accordance with some illustrative embodiments herein, the dual interface module may comprise an antenna wiring structure integrated into the core sheet. In some explicit illustrative examples herein, integration into the core sheet of the antenna wiring pattern structure may be achieved by depositing the antenna wiring structure on a surface of the core sheet, e.g. by printing or attaching a wiring structure to the core sheet. Alternatively, a wiring structure may be embedded into the core sheet by appropriate means such as recessing or sewing a wiring into the core sheet.

[0023] In a fourth aspect of the present invention, a method of forming a smart card is provided. In the illustrative embodiments herein, the method comprises forming a decomposable composite sheet body in accordance with the method of the second aspect and integrating a dual interface module into the decomposable composite sheet body. In accordance with some illustrative embodiments of the fourth aspect, the dual interface module may comprise an antenna wiring structure integrated into the core sheet before arranging the core sheet into the laminated stacking arrangement.

[0024] In accordance with some illustrative embodiments of the fourth aspect, the dual interface module may be integrated into the decomposable composite sheet body by forming a recess in a surface of the decomposable composite sheet body and implanting the dual interface module into the recess.

[0025] In the description of the various aspects of the present invention as provided above and the detailed description following below, organic fibers are considered as cellulose fibers derived from wood, rags, grasses or other vegetable sources, such as a cotton web and the like. Furthermore, inorganic fibers may be provided by polyester or eco friendly plastics, such as recycled polyester, PVC, bio-PVC, PET-G or any other type of ecofriendly plastic, such as bio plastics. Some examples of bioplastics include starch-based plastics, polyactic acid (PLA) plastics, poly-3-hydroxybutyrate (PHB) plastic, polyamide 1 1 (PA1 1 ) plastics, bio derived polyethylene plastics, and generally modified bioplastics.

[0026] Although only one first and one second sheet are disclosed in the context of the various aspects of the disclosure, this does not pose any limitation to the aspects and it is understood that the first and second sheet may be explicitly mentioned representatives of a plurality of sheets of an organic composite material comprising cellulose fibers embedded in a matrix of lignin, the plurality consisting of at least two sheets (i.e. the first and second sheets) and optionally one or more additional sheets (i.e. third sheet, fourth sheet, fifth sheet, sixth sheet etc.). Any suitable number of sheets greater two may be implemented in the decomposable composite sheet body.

[0027] Brief description of the drawings

[0028] In the drawings, like reference characters generally refer to the same features throughout the different drawings. Also, the drawings are not necessarily to scale, emphasis instead generally being placed upon illustrating the principles of the disclosure. Embodiments of the disclosure will now be illustrated for the sake of example only with reference to the following drawings, in which:

[0029] Fig. 1 schematically shows an initial stage of a process applied during the fabrication of a decomposable composite sheet body in accordance with some illustrative embodiments of the present disclosure, Fig. 2 schematically shows a subsequent stage following the stage illustrated in Fig. 1 in accordance with some illustrative embodiments of the present disclosure,

[0030] Fig. 3 schematically shows, in a cross sectional view, a decomposable composite sheet body after the process illustrated in Fig. 2 is completed,

[0031] Fig. 4 schematically shows in an exploded view a smartcard in accordance with some illustrative embodiments of the present disclosure,

[0032] Fig. 5a schematically shows a top view of the smartcard shown in Fig. 4 in accordance with some illustrative embodiments of the present disclosure,

[0033] Fig. 5b schematically shows a bottom view of the smartcard illustrated in Fig. 4 in accordance with some illustrative embodiments of the present disclosure, and

[0034] Fig. 6 schematically shows a decomposable composite sheet body in a cross sectional view in accordance with some illustrative embodiments of the present disclosure.

[0035] Detailed description

[0036] In accordance with various illustrative embodiments as described below with respect to the accompanying drawings, a decomposable composite sheet body is provided, which may be used as a card body of a smartcard. The decomposable composite sheet body may be therefore subjected to further processing in order to fabricate a desired card or smartcard on the basis of the decomposable composite sheet body.

[0037] With regard to Figs. 1 to 3, a processing of a decomposable composite sheet body 1 is described below. Fig. 1 shows the decomposable composite sheet body 1 in an initial stage during processing of the decomposable composite sheet body 1 . The decomposable sheet body 1 is provided in accordance with the decomposable sheet body of the first aspect disclosed above.

[0038] With ongoing reference to Fig. 1 , a sealing agent 8 is deposited on at least one surface of the decomposable composite sheet body 1. For example, the sealing agent 8 may be formed on an upper surface or an opposite bottom surface of the decomposable sheet body 1 , the upper surface and bottom surface being normal to a thickness direction of the sheet body (the thickness direction being associated with a direction along which sheets within the decomposable composite sheet body are stacked so as to obtain a laminated stacking arrangement of the sheets within the decomposable composite sheet body). In accordance with some illustrative examples herein, the sealing agent 8 may be deposited on the upper surface a of the decomposable composite sheet body by evenly distributing the sealing agent 8 across the entire surface a of the decomposable composite sheet body 1. For example, a drop of sealing agent may be deposited on the surface a of the decomposable composite sheet body 1 and the drop off sealing agent 8 may be evenly dispersed across the surface a of the decomposable composite sheet body formed by a dispersing tool c. The dispersing tool c may be a putty knife, speckle knife, spatula or roller tool configured for spreading and dispersing a bulk of deformable material evenly onto a surface.

[0039] Alternatively or additionally, the surface b may be treated accordingly to evenly spread the sealing agent 8 across the surface b of the decomposable composite sheet body.

[0040] Furthermore, the decomposable composite sheet body 1 as shown in Fig. 1 may comprise at least a first and second sheet of organic composite material being arranged in the laminated stacking arrangement such that a core sheet is interposed between the at least one first and second sheets. The at least one first and second sheets of organic composite material may comprise a material formed of cellulose fibers embedded in a matrix of lignin. The core sheet may comprise at least one of a fabric material and a paper material.

[0041] In accordance with some illustrative embodiments of the present disclosure, the individual sheets of the decomposable composite sheet body 1 as provided before depositing of the sealing agent 8 in the stage shown in Fig. 1 may be fixed together by adhesive layers formed between each of the first and second sheets and the core sheet. This does not pose any limitation to the present disclosure and the at least one first and second sheets and the core sheet may be loosely stacked in each other prior to depositing of the sealing agent 8 on the decomposable composite sheet body 1 in the initial state of Fig. 1.

[0042] In accordance with some illustrative embodiments of the present disclosure, the core sheet of the decomposable composite sheet body may be equipped with an antenna wiring structure, i.e. , an antenna of a RFID transmitting device and / or a magnetic strip. However, this does not pose any limitation to the present disclosure and the core sheet may not be equipped with any electrical and / or magnetic structure.

[0043] Referring to Fig. 2, the decomposable composite sheet body 1 is schematically shown at a subsequent stage during processing in which the decomposable composite sheet body 1 is arranged between two press plates 9 of a pressing tool which is configured to at least exert mechanical pressure to the decomposable composite sheet body 1 arranged there between. The decomposable composite sheet body 1 arranged in the pressing tool has the sealing agent 8 dispersed on the surfaces and b of the decomposable composite sheet body 1 after the stage illustrated in Fig. 1 .

[0044] In accordance with some illustrative embodiments of the present disclosure, the pressing tool applies a mechanical pressure via the pressing plates 9 to the decomposable composite sheet body 1. The mechanical pressure may be in the range of approximately 10 to 30 kg / cm2. In accordance with some illustrative embodiments, the pressure may be maintained for approximately 30 seconds to approximately 10 minutes, preferably from approximately 30 seconds to approximately 5 minutes, and more preferably for approximately 30 seconds to approximately 4 minutes. Optionally, the pressing tool may be configured to apply a heat to the decomposable composite sheet body 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. Accordingly, the pressing tool may be configured to perform a hot stamp press process to the decomposable composite sheet body 1 .

[0045] Referring to Fig. 3, a cross sectional view of the decomposable composite sheet body 1 is shown after the hotstamp press process is terminated. The schematically cross sectional view in Fig. 3 is not to scale and shows in exaggerated form an unevenness 2 in the surfaces a and b of the decomposable composite sheet body 1 . As schematically shown in Fig. 3, the surfaces a and b are smooth after the pressure process disclosed with regard to fig. 2 above and the sealing agent 8 fills the unevenness 2 in the surfaces a and b of the decomposable composite sheet body 1. As a result, the decomposable composite sheet body 1 has smooth surfaces SUS and SBS after the processes described above with respect to Figs. 1 and 2 are completed.

[0046] In accordance with some illustrative embodiments, the sealing agent 8, not only smoothens the surfaces a and b to result in the smoothened surfaces SUS and SBS as shown in Fig. 3, but it may also permeate into the decomposable composite sheet body 1 during the process described in Fig. 2, such that a strong interaction between the sheets in the decomposable composite sheet body is achieved such that a solid decomposable composite sheet body 1 results from the process described with regard to Figs. 1 and 2 above.

[0047] Referring to Fig. 4, a smartcard 10 in accordance with some illustrative embodiments of the present disclosure is schematically illustrated in an exploded view. The smartcard 10 may be formed on the basis of the decomposable composite sheet body 1 as described above with regard to Figs. 1 to 3. With continued reference to Fig. 4, the smartcard 10 comprises a laminated stacking arrangement of a core sheet 14 interposed between a first sheet 11 and a second sheet 12. The core sheet 14 may have an antenna wiring structure 14a integrated into the core sheet 14, for example, the antenna wiring structure 14a may be printed onto the core sheet 14 or the antenna wiring structure 14a may be imbedded into the core sheet 14.

[0048] In accordance with some illustrative embodiments of the present disclosure, the core sheet 14 may comprise at least one of a fabric material and a paper material. For example, the core sheet 14 may be formed by a fabric material onto which the antenna wiring structure 14a is attached or into which the antenna structure 14a is sewn. Alternatively, the core sheet 14 may be formed by a paper material on which the antenna wiring structure 14a is mounted or into which the antenna wiring structure 14a is embedded. Although not illustrated, the antenna wiring structure 14a may be electrically connected to an RFID chip such that the antenna wiring structure 14a and the RFID chip form an RFID device.

[0049] In accordance with some special illustrative but not limiting examples, the core sheet 14 may be formed by interposing the antenna wiring structure 14a between two sheets of fabric material or paper material or in between a sheet of paper material and a sheet of fabric material.

[0050] With ongoing reference to Fig. 4, the first sheet 11 and the core sheet 14 may be attached to each other via an adhesive layer 13a. For example, the adhesive layer 13a may be an ecofriendly glue.

[0051] Similarly, the second sheet 12 may be attached to the core sheet 14 by means of an ecofriendly glue 13b.

[0052] In accordance with some illustrative embodiments, the adhesive layer 13a and 13b may be provided by a sealing agent when subjecting the card body of the smartcard 10 during the fabrication process to a process as described above with regard to Figs. 1 to 3 in that the sealing agent is permeated into the card body, in particular permeating the first and second sheets 11 , 12 to at least reach, if not at least partially permeate the core sheet 14, thereby forming the adhesive layers 13a and 13b.

[0053] Referring to Fig. 5a, a top view of the smartcard 10 is schematically illustrated. The top view shows a top view of the first sheet 11 of the smartcard 10, where a card module, e.g. an ISO module, 24 is integrated into the smartcard 10. Alternatively or additionally, a printing section 21 is provided in the surface of the first sheet 11 such that the smartcard 10 may be personalized by individual printing information onto the first sheet 11. However, this does not pose any limitation to the present disclosure and the person skilled in the art will appreciate that either one of the module 24 and the area 21 are optional.

[0054] Referring to Fig. 5b, a bottom view of the smartcard 10 is schematically illustrated showing a planar view of the second sheet 12. The bottom surface shown in Fig. 5b of the second sheet 12, may be personalized by either one of a printing section 25b and a hologram section 25a to increase the security of the smartcard 10. Alternatively or additionally, a magnetic strip 26 may be provided in the second sheet 12. For example, the second sheet 12 may be recessed and the magnetic strip 26 may 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 pose any limitation to the present disclosure and the person skilled in the art will appreciate that either one of the magnetic strip 26 and the personalized printing 25a, 25b is optional.

[0055] Referring to Fig. 4, the smartcard 10 may be formed by providing a decomposable composite sheet body in accordance with a decomposable composite sheet body 1 described above with regard to Fig. 3and to integrate a dual interface module, e.g. the ISO module 24 into the decomposable composite sheet body. Furthermore, the decomposable composite sheet body may be subjected to personalization in accordance with the printing section 21 on the first sheet 11 and / or the magnetic strip 26 and / or the personalization’s 25a and 25b on the second sheet 12. This does not pose any limitation to the present disclosure and the person skilled in the art will appreciate that the smartcard 10 may be provided without the dual interface module 24.

[0056] Referring to Fig. 6, a decomposable composite sheet body T is schematically illustrated in a cross sectional view. The cross sectional view in Fig. 6 is not to scale.

[0057] The decomposable composite sheet body T comprises a core sheet 14 as described above, adhesive layer 13a and 13b as described above, and first and second sheets 11 and 12 as described above. The laminated stacking arrangement comprising the core sheet 14 and the first and second sheets 11 , 12 may be formed in accordance with the decomposable composite sheets body 1 as described above.

[0058] In accordance with some illustrative examples herein, the first and second sheets 11 , 12 may be formed of cherry veneer, while the core sheet 14 may be formed of a cotton web. However, this does not pose any limitation to the present disclosure and appropriate different materials may be employed instead. In accordance with some illustrative embodiments of the present disclosure, the core sheet 14 may have antenna wiring structure corresponding to the antenna wiring structure 14a integrated therein as described above with regard to Fig. 4.

[0059] With ongoing reference to Fig. 6, the laminated stacking arrangement formed by the core sheet 14 and the first and second sheets 11 , 12 may further comprise thin sheets 32a and 32b attached to the first and second sheets 11 , 12 via adhesive layers 31 a and 31 b. Furthermore, a smoothening surface 33a and 32b may be provided, similar to the smoothened surfaces SUS and SBS as described above with regard to Fig. 3.

[0060] In accordance with some illustrative embodiments of the present disclosure, the thin sheets 32a and 32b may have a thickness smaller than a thickness of the core sheet 14. For example, the thickness of the thin sheets 32a and 32b may be at least two times smaller than the thickness of the core sheet 14. The thin sheets 32a and 32b may be formed of the same material as the core sheet 14 or of a different material comprising at least one of a fabric material and a paper material.

[0061] Upon subjecting the decomposable composite sheet body T of Fig. 6 to a personalization as described above with regard to Figs. 4, 5a and 5b, a smartcard may be formed of the decomposable composite sheet body T in analogy to the description presented above with regard to the smartcard 10 in the context of Figs. 4, 5a and 5b.

[0062] For example, after providing the decomposable composite sheet body T, a cavity may be formed in the decomposable composite sheet body T so as to form a cavity for accommodating a dual interface module (not illustrated) in a post implantation process. For example, the recess and implantation of the dual interface cavity may be such that an antenna wiring structure (not illustrated) is electrically contacted in the decomposable composite sheet body T.

[0063] In various illustrative embodiments of the present disclosure as described herein, a sealing agent is employed. The sealing agent may be given by an adhesive that can be used in the art of producing wood-based materials or an adhesive or adhesive mixture suitable for solid wood products, e.g. waxes, resins, glues, cement milk, PF adhesives (phenoplast), MUPF adhesives (melamine-urea-phenol-formaldehyde), UF adhesive (urea-formaldehyde adhesive), MUF adhesives (melamine-containing urea-formaldehyde adhesives) and PMDI adhesives (polymeric diphenylmethane diisocyanate). For example, adhesives and / or adhesive mixtures of the following adhesive classes can preferably be used: phenolic resins (PF) The phenol-formaldehyde resins (PF) represent an important group in the field of wood binders. PF resins are mainly used for water and weather-resistant gluing. The advantages of using PF glues are, on the one hand, the low to almost no formaldehyde emission and, on the other hand, the low thickness swelling. However, PF resins cure more slowly compared to aminoplastic resins. The wooden materials produced have a darker color caused by a dark glue joint, which can be seen when using very light-colored veneer. The phenol used can condense and crosslink with formaldehyde both in the alkaline and in the acidic range. A distinction is made between the alkaline-hardening phenols as resols and the acid-hardening ones as novolaks. Only the alkaline hardening phenols are used in the wood-based materials industry. Phenolic resin glues are aqueous, alkaline solutions consisting of oligomeric to polymeric chains. The alkaline pH value can cause problems when coating these wood-based materials, as well as when using different types of acidic wood.

[0064] PMDI binders

[0065] PMDI binders based on isocyanates Unlike UF and PF resins, isocyanates do not belong to the condensation resins, but are based on polymethylene diisocyanate (PMDI) and are mainly used for the production of wood-based materials for use in humid areas and for "formaldehyde- free" glued boards. PMDI is particularly suitable as a binder for annual plants that are difficult to glue, e.g. B. Straw and bagasse. PMDI has a very high adhesive behavior, but this makes processing extremely difficult because it does not only react with the wood surface. Various basic reactions can take place when isocyanates are used as binders. These include reaction with water, with the hydroxyl groups of cellulose and hemicellulose, and others carbohydrates, with hydroxyl groups of lignin and tannins and with the COOH groups of polygalacturonic acids, uronic acids and lignins.

[0066] Urea formaldehyde resins (UF)

[0067] The UF resins are the most important group of aminoplastic binders in the wood-based materials industry. These binders have an amino group (-NH2) either in the form of the amine bond (R-NH2) or the amide bond (R-CO-NH2). UF resins are easy to handle and uncomplicated to process. They can be glued both cold and hot and a combination with other binder systems is possible. After pressing, the hardened glue joints have a duroplastic behavior and a high strength of the glue. Particular advantages of UF resins are colorlessness and low price compared to other binders. Nevertheless, the use of UF resins is not entirely without problems. On the one hand, with UF Resin-made wood-based materials are not insensitive to the effects of moisture and water, and on the other hand, formaldehyde is released during processing and when the wood-based materials are later used. In order to reduce sensitivity to moisture, melamine and sometimes also phenol are now being incorporated into the LIF resins. By greatly reducing the molar ratio between formaldehyde and urea, it was possible to greatly reduce formaldehyde emissions.

[0068] Melamine and melamine mixed resins (MF) Like UF resins, melamine resins also belong to the group of aminoplasts.

[0069] For cost reasons, pure melamine resins are hardly used at all. They are often used as impregnating and soaking resins. However, adding melamine to other resins is common. The limited resistance to hydrolysis of cured UF resins can be improved by adding melamine and thickness swelling is reduced. The melamine urea formaldehyde resins (MUF) are distinguished 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).

[0070] Binders based on renewable raw materials, e.g. B. Tannins

[0071] Tannins are vegetable polyhydroxyphenols (tannins) that are soluble in water, alcohol and acetone. Tannins are mainly obtained by extraction from wood, bark, leaves and fruit. There have been numerous studies on the use of mimosa bark extracts and various pine bark extracts. Chemically, the tannins are divided into hydrolyzable and condensed types. Tannins are used as binders either with a formaldehyde component as a crosslinking agent or in combination with amino or phenolic resins. gluten glue

[0072] Glutin glue is a natural glue made from waste skin, leather or bone.

[0073] Casein glue

[0074] This glue consists of milk and lime.

[0075] Resorcinol-formaldehyde resin glue (also RF glue)

[0076] Consists of liquid glue and powdered hardener.

[0077] Low-formaldehyde polycondensation glue

[0078] Formaldehyde is required to harden the glue resins. In most cases the formaldehyde content is higher than that of the other resin components to ensure a good cure (stoichiometric excess). However, with this polycondensation glue, the reduction of free formaldehyde is achieved by adding formaldehyde scavengers or Reduction of the formaldehyde content achieved.

[0079] Formaldehyde-free dispersion glue

[0080] The well-known white glue is a formaldehyde-free dispersion glue, based on PVAC (polyvinyl acetate) as a binder, which is supplied ready-to-use in water as a dispersion and is available as cold glue, quick binder, veneer glue, hardening glue, varnish glue and hot glue. It is available in stress groups D2-D3. For D4 gluing, a D3 glue is required, to which hardener is added before use. There are also D2 glues that achieve D4 quality with the addition of a hardener.

[0081] Pll glues

[0082] The most modern glues for the wood sector today are the one-component Pll glues (polyurethanes). They are waterproof (D4) and not only glue wood, but almost all glueable materials. These are solvent-free reactive adhesives that harden with the help of moisture. Suitable solvents are solvents into which the desired adhesives, antioxidants and / or preservatives and optionally other components of the solution can be introduced sufficiently well, optionally with the aid of emulsifiers, and which are suitable for use on wood-containing starting materials. These are, for example, water and / or other organic solvents such as alcohols. Suitable solvents include mixtures of water and organic solvents, such as mixtures containing alcohols or Mixtures containing different organic solvents. Suitable solvents are known to those 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 dispersion. However, it can also be an oily or greasy solution. The antioxidants and / or preservatives can be emulsified, suspended and / or dispersed in the solution. The wetting of 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 those skilled in the art which is suitable for bringing the woodcontaining starting materials into contact with the solution containing at least one adhesive and at least one antioxidant or at least one preservative is to take place.

[0083] When applying the sealing agent, suitable methods may be employed such as a suitable gluing treatment as described above with respect to Fig. 1 or in an alternative way using spraying, coating, dipping or other methods for applying the solution (e.g. B. in MDF production also adding during cooking). Details on appropriate sealing agents in the processing of wood are for example described in document WO 2009 / 156 258 A1 , the disclosure of which is incorporated herein in its entirety by reference, in particular the disclosure in document WO 2009 / 156 258 A1 regarding glue and gluing as disclosed above is incorporated in its entirety by reference.

Claims

CLAIMS1 . A decomposable composite sheet body, comprising a first and second sheet of organic composite material comprising cellulose fibers embedded in a matrix of lignin, and a core sheet interposed between the first and second sheets forming a laminated stacking arrangement, wherein the core sheet comprises at least one of a fabric material and a paper material.

2. The decomposable composite sheet body of claim 1 , wherein the fabric material comprises at least one of organic and inorganic fibers.

3. The decomposable composite sheet body of claim 1 or 2, wherein the organic composite material comprises veneer wood material.

4. The decomposable composite sheet body of one of claims 1 to 3, wherein a thickness of the core sheet is smaller than a thickness of each of the first and second sheets.

5. The decomposable composite sheet body of one of claims 1 to 4, wherein at least one of an upper surface of the first sheet and a bottom surface of the second sheet is at least partially coated with a sealing agent, the upper surface of the first sheet and the bottom surface of the second sheet facing away from the core sheet in the laminated stacking arrangement.

6. The decomposable composite sheet body of one of claims 1 to 5, further comprising at least one of a first thin sheet and a second thin sheet, each of which being formed by a fabric material or a paper material, the at least one of the first thin sheet and the second thin sheet being arranged over the core sheet in the laminated stacking arrangement such that at least one of the first and second sheets is interposed between the core sheet and the at least one of the first thin sheet and the second thin sheet.

7. The decomposable composite sheet body of claim 6, wherein a thickness of each of the first and second thin sheets is smaller than a thickness of the core sheet.

8. The decomposable composite sheet body of claim 6 or 7 in combination with claim 5, wherein the at least one of the first thin sheet and the second thin sheet is permeated by the sealing agent.

9. A method of forming a decomposable composite sheet body, the method comprising:forming a laminated stacking arrangement by stacking a first sheet and a second sheet with a core sheet interposed between the first and second sheets, wherein the first and second sheets are formed of an organic composite material comprising cellulose fibers embedded in a matrix of lignin, and wherein the core sheet comprises at least one of a fabric material and a paper material.

10. The method of claim 9, further comprising: depositing a sealing agent at least partially on at least one of an upper surface of the first sheet and a bottom surface of the second sheet, wherein the upper surface of the first sheet and the bottom surface of the second sheet are facing away from the core sheet in the laminated stacking arrangement; and subsequently applying a permeating process for permeating the sealing agent at least partially into the core sheet.

11. The method of claim 10, wherein the permeating process comprises a hotpress stamp process applied to the laminated stacking arrangement.

12. The method of one of claims 9 to 11 , wherein the decomposable composite sheet body of one of claims 1 to 8 is formed.

13. A smart card formed of the decomposable composite sheet body of one of claims 1 to 8, the smart card further comprising a dual interface module integrated into the decomposable composite sheet body.

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

15. A method of forming a smart card, the method comprising: forming a decomposable composite sheet body in accordance with the method of one of claims 9 to 12; and integrating a dual interface module into the decomposable composite sheet body.

16. The method of claim 15, wherein the dual interface module comprises an antenna wiring structure integrated into the core sheet before arranging the core sheet into the laminated stacking arrangement.

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

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