Injection molded part and method for producing injection molded part

Abstract

The invention relates on the one hand to an injection-molded part having a plastic base layer (4), a preferably transparent or translucent cover layer (2), and a layer between the base layer (4) and the cover layer (2) containing a separate decorative element (3), wherein the decorative element (3) is at least partially embedded in the cover layer (4) and the base layer (2). The invention also relates to a method for producing an injection-molded part, wherein the decorative element (3) is placed on an adhesive cover layer (2) and the base layer (4) is applied to the decorative element (3) by injection molding, wherein according to the invention, the separate decorative element (3) is preferably applied to the adhesive surface of the cover layer (2) by a random process and, if necessary, a second cover layer (2) is applied, the decorative element (3) is at least partially embedded in the cover layer, the cover layer (2) is allowed to dry, and the base layer (4) is applied to the decorative element (3) by injection molding so that the base layer is embedded in the rest of the decorative element.

Description

Technical Field

[0001] The invention relates to an injection molded part and a method for producing the same. The injection molded part consists of a plastic base layer, at least one preferably transparent or translucent cover layer, and a decorative layer, which is arranged between the cover layer and the base layer and contains decorative elements. The injection molded part can be produced using a method in which

[0002] - the decorative element is applied to the covering layer, and

[0003] The base layer is applied to the decorative element by plastic injection molding. Background Art

[0004] The process can be used to produce decorative and cladding components for the automotive, aircraft and furniture industries, as well as for the design of works of art.

[0005] Injection molding is a well-known process for producing decorative elements for automotive interiors. During this step, a decorative layer (e.g., aluminum, wood veneer, printed decorative film) is inserted into the cavity of a tool. An adhesive layer is laminated onto the inner surface of the decorative layer facing the tool as an adhesion promoter. The base layer of the injection-molded part is then formed by injecting a thermoplastic material into the mold cavity. During the injection process, the decorative layer is pressed against the inner surface of the mold cavity and adhered to the base layer via a laminating adhesive layer. In another known variation of the injection molding process, the decorative layer is preformed before insertion into the injection molding tool. This method, thanks to the decorative layer, allows for significantly lower manufacturing costs for aesthetically pleasing components than, for example, metal casting. The injection molding process allows for the production of not only continuous decorative surfaces but also those composed of several individual decorative elements. However, when using individual decorative elements, the inflowing plastic can displace the decorative elements, causing them to become differently arranged and their distribution across the surface to change. For example, a solution to this problem is provided in publication DE 10 2012 016 147 A1, in which a thermoplastic base layer is injected onto a two-layer surface decoration for reinforcement purposes. According to the method described therein, a second decorative layer, consisting of several individual decorative elements, is glued to a first, continuous, full-surface decorative layer. The plastic base layer is then injection-molded onto the first continuous decorative layer, and a cover layer is applied, if necessary, to serve as a protective layer on the surface of the second decorative layer. However, a disadvantage of this solution is that the decorative layer is not embedded in the injected plastic base layer and can therefore easily separate from the base layer due to mechanical stress. Summary of the Invention

[0006] The object of the present invention is to avoid the disadvantages of the prior art and to modify the injection molding process so that the pattern and design of a decorative layer consisting of several individual decorative elements can be formed as desired immediately before injection molding and this pattern and / or this design remains unchanged during the injection molding process.

[0007] Another object of the present invention is to provide an injection-molded part and a method for producing the same, which ensures stronger surface bonding and higher adhesion between layers, thereby increasing the load-bearing capacity and life of the finished injection-molded piece.

[0008] The present invention is based on the knowledge that if sufficient adhesion is achieved between the individual decorative elements forming the decorative layer and the cover layer, the previously formed decorative pattern on the cover layer remains essentially unchanged during the various steps of the injection molding process. Furthermore, if the decorative elements of the decorative layer are at least partially embedded in the adjacent layer, the bonding between the individual layers can be significantly increased.

[0009] For this purpose, we begin with an injection-molded part comprising a plastic base layer, a preferably transparent or translucent cover layer, and a decorative layer comprised of several individual decorative elements positioned between the cover layer and the base layer. According to the present invention, the decorative elements of the decorative layer are embedded in both the base layer and the cover layer of the injection-molded part. The degree of embedding in the cover layer is preferably 1-90%, based on the average cross-sectional area of the individual decorative elements, with the remaining portion of the decorative elements embedded in the base layer. This injection-molded part structure ensures sufficient adhesion between the decorative elements of the decorative layer and the cover layer, ensuring that the originally formed pattern and design remain substantially unchanged during the injection molding process. Furthermore, since the decorative elements of the decorative layer are at least partially embedded in the cover layer and the base layer, the bonding between the layers is significantly enhanced, ensuring the product's load-bearing capacity and service life even under mechanical stress during use.

[0010] In a preferred embodiment of the injection-molded part according to the invention, the covering layer consists of a thermosetting plastic with an adhesive surface that secures the position of the decorative elements before hardening. The decorative elements can be applied to the covering layer with the adhesive surface according to a predetermined pattern or in a random pattern (e.g., by sprinkling). Due to the adhesive surface of the covering layer, the arrangement of the decorative elements remains unchanged during the injection molding process.

[0011] In another possible embodiment of the injection-molded part produced according to the invention, the covering layer comprises a transparent or translucent outer load-bearing plastic layer, to the inner surface of which facing the decorative element a thermosetting plastic layer is applied, which acts as an adhesive layer to fix the position of the decorative element before curing.

[0012] In another possible embodiment of the injection-molded part produced according to the invention, the unit consisting of the base layer, the layer with the decorative element, and the cover layer is combined with a second identical multilayer unit, wherein the outer base layer is made of a transparent or translucent plastic.

[0013] In the injection molded part produced according to the present invention, the base layer and the cover layer forming the adhesive layer are formed by thermoplastics or thermosetting plastics. In order to improve the wear resistance of the cover layer forming the outer layer, thermosetting plastics are preferably used.

[0014] In the injection-molded parts produced according to the invention, the decorative elements are formed from waste products and / or natural materials.

[0015] According to the invention, we start from a method suitable for producing injection-molded parts, in which a decorative element is applied to a cover layer and a base layer is applied to the decorative element by injection molding.

[0016] In the method according to the invention

[0017] - individual decorative elements are applied to a covering layer having an adhesive surface,

[0018] - the decorative elements are embedded in the covering layer, preferably to a degree of embedding of 1% to 90% based on the size of the average cross-sectional area of the individual decorative elements,

[0019] - Wait for the sticky cover to dry,

[0020] The base layer is applied to the decorative element by injection molding so that the base layer embeds into the rest of the decorative element. The embedding degree in the base layer is preferably 99-10%, depending on the size of the decorative element.

[0021] In the method according to the invention, waste products and / or natural materials are used as decorative elements. The decorative elements can be applied to the cover layer, which serves as an adhesive layer, according to a predetermined pattern or in a random pattern (e.g., by spraying). Due to the adhesive strength of the cover layer, this arrangement remains essentially unchanged during the injection molding process, particularly after the cover layer has cured.

[0022] In a preferred variant of the method according to the invention, a cover layer with an adhesive surface is applied to a carrier layer that has been preformed according to the shape of the injection molding tool. This preformed carrier layer assumes the shape of the outer surface of the finished injection-molded part. In the case of a plastic carrier layer, a transparent or translucent plastic is preferably used to ensure visibility of the decorative element.

[0023] In another possible variant of the method according to the invention, a metal carrier layer is used, which is separated from the injection-molded part after the injection molding process. An aluminum carrier layer is preferably used as the metal carrier layer because it is easily deformable. This carrier layer can be formed from a metal sheet, for example, by cold forming, but any other known forming process can also be used.

[0024] In another possible variant of the method according to the invention, the adhesive cover layer is applied to an inner surface, preferably a lower inner surface, of the injection molding tool.

[0025] In another preferred variant of the method according to the invention, an outer carrier layer made of plastic is used, to the inner surface of which, facing the decorative element, a thermosetting plastic is applied, which inner surface of the outer carrier layer, facing the decorative element, serves as an adhesive surface for fixing the decorative element before curing.

[0026] In another possible variant of the method according to the invention, the multilayer structure consisting of the base layer, the intermediate layer with the decorative element, and the cover layer is combined with a second, identically constructed multilayer structure to form a multilayer design, the outer base layer of which is made of a transparent or translucent plastic. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Hereinafter, an injection-molded article and a method for producing the injection-molded article of the present invention are described with reference to exemplary embodiments shown in the accompanying drawings.

[0028] Figure 1 A cover layer 2 is shown in cross section with an adhesive surface applied to a carrier layer 5 , on which adhesive surface a decorative element 3 is arranged.

[0029] Figure 2 The cross-sectional view is also shown according to Figure 1 arrangement, which is inserted into the lower half of the two-part injection molding tool 1,

[0030] Figure 3 Shows that after injection molding, Figure 2 The arrangement of the base layer 4,

[0031] Figure 4 shows the injection-molded part with the carrier layer 5 after removal of the injection-molded part from the tool,

[0032] Figure 5Shows the removal of the carrier layer 5 according to Figure 4 Injection molded parts,

[0033] Figure 6 A cover layer 2 with an adhesive surface, applied to the lower half of a two-part injection molding tool 1 , is shown in cross section, on which surface a decorative element 3 is arranged.

[0034] Figure 7 Shows that after injection molding, Figure 6 The arrangement of the base layer 4,

[0035] Figure 8 shows the injection-molded part with the cover layer 2 , the decorative element 3 and the base layer 4 after removal from the tool,

[0036] Figure 9 The injection-molded part is shown after removal from the tool, and comprises a covering layer 2, a decorative element 3, a transparent or translucent base layer 4 as a carrier layer 5' for a further covering layer 2', a further layer 3' with a decorative element, and a further base layer 4'.

[0037] Figure 10 An injection-molded part removed from a tool is shown, comprising a carrier layer 5 made of a transparent or translucent plastic, a covering layer 2, a decorative element 3, a transparent or translucent base layer 4 serving as a carrier layer 5' for a further covering layer 2', a further layer with a decorative element 3', and a further base layer 4'. DETAILED DESCRIPTION

[0038] Figures 1 to 5 The essential steps of a possible variant of the method according to the invention with a carrier layer 5 are shown in cross section. Figures 6 to 8 The basic steps of another possible embodiment are shown in cross section, in which the decorative element 3 is located directly on the inner surface of the lower half of the injection molding tool 1. In order to achieve the required adhesion, this inner surface of the tool is provided with an adhesive covering layer 2.

[0039] Figure 1The adhesive cover layer 2 is applied to a carrier layer 5 and a decorative element 3, with the decorative element 3 being secured to the carrier layer 5 by the adhesive cover layer 2. The cover layer 2 can be made, for example, of a thermosetting plastic that is liquid before being applied to the carrier layer, making it easy to process. The decorative elements 3, which can be composed of waste products, natural materials, or other relatively small, regularly or irregularly shaped elements, can be applied to the cover layer 2 according to a predetermined pattern or randomly, for example by spraying. The dimensions of the decorative elements 3 are preferably between 1 mm and 10 mm, preferably between 2 mm and 8 mm, or preferably between 3 mm and 6 mm. The decorative elements 3 are embedded in the cover layer 2 to a degree of preferably 1-90%, based on the average cross-sectional area of the individual decorative elements 3. The thickness of the cover layer 2 is preferably between 0.1 mm and 5 mm, preferably between 0.2 mm and 3 mm, and preferably between 0.5 mm and 2 mm.

[0040] After the decorative element 3 has been placed on the substantially liquid or at least spreadable adhesive covering layer 2 and if necessary another adhesive covering layer is applied, drying of the covering layer 2 is awaited, ie an adhesive bond is formed between the decorative element 3 and the covering layer 2 .

[0041] The carrier layer 5 with the cover layer 2 and the decorative element 3 is then inserted into an injection molding tool, preferably into the lower half of the injection molding tool, as shown in FIG. Figure 2 After the two mold halves are closed, the cavity of the mold 1 can be filled with a base layer 4 made of plastic using an injection molding process. Figure 3 The injection molding tool 1 is shown after the injection molding process. The base layer 4 is preferably made of a thermoplastic, which is preferably not transparent or translucent, but rather a colored plastic or a plastic that is colored in its matrix. The colors of the decorative element 3 and the base layer 4 are preferably different, but can also be selected depending on the desired appearance of the decorative surface. Figure 4 The finished injection molded part is shown after removal from the tool. Figure 1 The arrangement shown differs in that the decorative element 3 is also embedded in the base layer 4. In this figure, the base layer 4 is shown above the decorative element 3, whereas in the built-in position of the piece, the base layer is located on the non-visible rear side of the piece.

[0042] The remaining part of the decorative element 3 is embedded in the base layer 4, since the layer thickness of the base layer corresponds at least to the maximum thickness of the decorative element 3. The decorative element is also embedded in the base layer 4 so that, based on the maximum size of the decorative element 3, the embedding degree is preferably between 99% and 10%.

[0043] In the case of the carrier layer 5 consisting of a metal sheet (e.g. aluminum), the carrier layer 5 is preferably removed after the injection molded part has been removed from the tool 1, so that the carrier layer 5 is no longer a component of the injection molded part. After the carrier layer 5 has been removed, the cover layer made of a transparent or translucent material, the underlying decorative layer of the decorative element 3, and the base layer 4 behind the decorative element 3 become visible, as shown in FIG. Figure 5 As shown. To optimize the tactile and aesthetic effects, the surface of the cover layer 2 can subsequently be ground and / or polished, and optionally painted. The grinding process allows for at least partial removal of the cover layer 2. With the complete removal of the cover layer 2, the decorative element 3 is exposed and directly tactile and visible. After the complete removal of the cover layer, it is recommended to cover the decorative element 3 with a cosmetic or protective lacquer layer.

[0044] In the case where the carrier layer 5 is a preformed plastic carrier layer, which preferably consists of a transparent or translucent material, it is not necessary to remove the carrier layer 5 from the injection-molded part after the injection-molded part is removed from the tool 1. In this case, the carrier layer 5 forms a component of the injection-molded product together with the cover layer 2 to which the decorative element 3 is fixed and the base layer 4 on the back of which the decorative element 3 is embedded. Optionally, such a carrier layer can also be used with Figure 4 and Figure 5 The design of the injection molded parts shown is the same, in this case we obtain a multi-layer injection molded product, such as Figure 9 and Figure 10 shown.

[0045] In another variant of the method according to the invention, the cover layer 2 is not applied to the carrier layer 5 but directly to the inner surface of the lower half of the injection molding tool 1 , as in Figure 6 As shown. The decorative element 3 can be Figure 1 The same method as shown is used for placing the cover layer 2, so it will not be described again. Figure 7 An injection molding tool 1 is shown with a finished part consisting of a cover layer 2 with an adhesive surface or substance, a decorative layer with decorative elements 3 , and a base layer 4 formed in the cavity of the tool 1 by injection molding. Figure 8 The finished injection-molded part is shown after it has been removed from the injection-molding tool 1. Since no carrier layer 5 is used in this process variant, it does not have to be removed or is not part of the injection-molded product.

[0046] Injection molded parts can also be formed, according to Figure 4 or Figure 5 Injection molding products and Figure 8The injection molded products are combined by superimposing them on each other by injection molding. In the design of such a multi-layer injection molded part, the base layer facing the visible side is preferably also composed of a transparent or translucent material. By such an arrangement and suitable material selection, two or more layers with decorative elements 3 are visible one after another, such as Figure 9 and Figure 10 shown.

[0047] Figure 5 The injection-molded part shown in FIG has a plastic base layer 4, a preferably transparent or translucent cover layer 2, and a decorative layer consisting of a decorative element 3 arranged between the base layer 4 and the cover layer 2. The intermediate layer with the decorative element 3 is at least partially embedded in the base layer 4 and the cover layer 2. Based on the thickness of the decorative element, the embedding degree in the base layer is preferably 10-99%, with the remaining portion of the decorative element 3 embedded in the base layer. Therefore, based on the maximum size of the decorative element, the embedding degree in the cover layer is preferably 90-1%.

[0048] The covering layer 2 is, for example, a layer made of a thermosetting plastic having a sticky surface that fixes the position of the decorative element 3 before curing, or the covering layer 2 is completely made of an adhesive material such as glue.

[0049] exist Figure 4 In the injection-molded part shown, the covering layer 2 comprises a transparent or translucent outer plastic carrier layer 5, on the inner surface of which facing the decorative element 3 is applied a thermosetting plastic having an adhesive surface which fixes the position of the decorative element 3 before curing, or the covering layer is made entirely of an adhesive material (such as glue).

[0050] Figure 5 The injection molded parts can be combined with themselves or with Figure 4 The multi-layer injection molded part is composed of at least two units, each unit comprising at least one base layer 4 or 4', a decorative layer with decorative elements 3 or 3', and a cover layer 2 or 2', the outer base layer 4 being made of a transparent or translucent plastic (see Figure 9 and Figure 10 ).

[0051] The base layer is made of, for example, a thermoplastic material, and the cover layer 2 forming the adhesive layer is preferably made of a thermosetting plastic.

[0052] Decorative elements 3 can be made of waste or natural materials. Examples of usable waste materials include, but are not limited to, waste from manufacturing processes: wood chips, metal shavings, metal scraps, plastic waste, paper scraps, carbon fiber, glass fiber, or basalt fiber, textile waste, metal foil waste, and paint waste. Examples of usable natural materials include, but are not limited to, gravel, snail shells, mussels, fruit bowls, wood, and minerals. The arrangement of decorative elements 3 can be freely designed based on the desired decorative appearance.

[0053] In a possible variant of the method according to the invention for producing an injection-molded part, the method steps are as follows:

[0054] a) the carrier layer 5 is produced from a metal sheet by cold forming,

[0055] b) inserting the carrier layer 5 into the lower part of the injection molding tool 1,

[0056] c) applying the cover layer 2 to the carrier layer 5,

[0057] d) spraying the decorative element 3 onto the cover layer 2,

[0058] e) waiting for the adhesive cover layer 2 to dry,

[0059] f) joining the halves of the injection molding tool 1 together and closing the injection molding tool 1,

[0060] g) forming the base layer 4 in the mold cavity by injection molding,

[0061] h) opening the mold 1 and removing the injection molded part,

[0062] i) The carrier layer 5 is separated from the injection-molded part.

[0063] As an additional step, the exposed surface of the cover layer 2 can be treated as needed. Process step b) indicated in the examples can also be used after process step d). After step d), process step c) can be repeated if necessary to fully bond the decorative element 3.

[0064] In another possible variant of the method according to the invention for producing an injection-molded part, the process steps are as follows:

[0065] a) the carrier layer 5 is produced from a transparent or translucent plastic,

[0066] b) inserting the carrier layer 5 into the lower part of the injection molding tool 1,

[0067] c) applying the cover layer 2 to the carrier layer 5,

[0068] d) spraying the decorative element 3 onto the cover layer 2,

[0069] e) waiting for the adhesive cover layer 2 to dry,

[0070] f) joining the halves of the injection molding tool 1 together and closing the injection molding tool 1,

[0071] g) forming the base layer 4 in the mold cavity by injection molding,

[0072] h) The mold 1 is opened and the injection molded part is removed.

[0073] In this variant, the carrier layer 5 is not separated from the finished injection-molded part, as it forms part of the product. Process step b) as indicated in the examples can also optionally be performed after process step d). After step d), process step c) can be repeated, if necessary, to fully bond the decorative element 3.

[0074] In a further preferred variant of the method according to the invention for producing an injection-molded part, the method steps are as follows:

[0075] a) applying the cover layer 2 to the inner surface of the lower part of the injection molding tool 1,

[0076] b) spraying the decorative element 3 onto the cover layer 2,

[0077] c) waiting for the adhesive cover layer 2 to dry,

[0078] d) joining the halves of the injection molding tool 1 together and closing the injection molding tool 1,

[0079] e) the base layer 4 is formed in the tool cavity by injection molding,

[0080] f) The mold 1 is opened and the injection molded part is removed.

[0081] As an additional step, the exposed surface of the cover layer 2 can be treated as required. After step b), process step a) can be repeated if necessary to fully bond the decorative element 3.

[0082] In each embodiment of the method, the cover layer 2 comprises a transparent or translucent thermosetting plastic having a bonding surface.

[0083] The advantage of the injection-molded part according to the present invention is that the decorative elements 3 embedded in the cover layer 2 and the base layer 4 can be connected to each other with high strength, which prevents the decorative elements 3 from being shifted or rearranged during injection molding and ensures a high load-bearing capacity for the finished product during assembly and / or use of the component.

[0084] The process can be carried out in many variants, which significantly increases the number of possible product variants. Not only single-component, but also two-component or multi-component injection molding processes can be used.

[0085] Terminology used:

[0086] 1 Injection mold

[0087] 2. 2' cover (with sticky surface)

[0088] 3.3' decorative elements

[0089] 4, 4' base

[0090] 5.5' carrier layer

Claims

1. A method for producing an injection molded product, characterized in that The following steps are used to produce multi-layer products: a) providing a carrier layer (5) preformed from a metal sheet or plastic according to the shape of the injection molding tool; b) applying a hardened, adhesive cover layer (2) to one side of the carrier layer (5), wherein the cover layer (2) is made of a transparent or translucent material and has a thickness of 0.1 mm to 5 mm; c) applying a plurality of individual decorative elements (3) to the cover layer (2) by spraying, whereby the decorative elements (3) are at least partially embedded in the cover layer (2); d) curing the cover layer (2), whereby the decorative element (3) is fixed in the carrier layer (5); e) inserting the carrier layer (5) with the hardened cover layer (2) and the fixed decorative element (3) thereon into the injection molding tool, f) injecting the injection-moldable material of the base layer (4) into the injection-mold tool onto the side of the cover layer (2) opposite the carrier layer (5), while maintaining the pattern of the decorative element (3) applied in step c) unchanged in the hardened cover layer (2); g) removing the carrier layer (5) from the finished multilayer product consisting of the base layer (4), the layer of the decorative element (3) and the covering layer (2), wherein the decorative surface having the pattern defined by the decorative element (3) is exposed on the outer side of the covering layer (2) of the injection-molded product.

2. The method according to claim 1, characterized in that The decorative elements (3) are applied in step c) on the cover layer (2) according to a predetermined pattern or in a random pattern.

3. The method according to claim 1 or 2, characterized in that The cover layer (2) is made of hardened plastic or hardened adhesive.

4. The method according to claim 1 or 2, characterized in that In a further processing step, the exposed cover layer (2) of the finished product is processed by grinding or polishing.

5. The method according to claim 1 or 2, characterized in that The decorative surface is covered with a paint layer.

6. The method according to claim 1 or 2, characterized in that The decorative element (3) is made of waste products or natural materials.

7. The method according to claim 6, characterized in that The decorative element (3) is selected from the group of the following materials: wood chips, metal shavings, metal chips, plastic waste, paper scraps, carbon fiber, glass fiber or basalt fiber, textile waste, metal foil waste, paint waste or available natural materials.

8. The method according to claim 1 or 2, characterized in that A multilayer design is formed comprising a base layer (4), an intermediate layer with a decorative element (3), and a cover layer (2), and a second multilayer design also comprising a base layer (4'), an intermediate layer with a decorative element (3'), and a cover layer (2'), wherein the outer base layer (4') is made of a transparent or translucent plastic.

9. The method according to claim 7, characterized in that The natural materials that can be used are gravel, snail shells, mussels, fruit bowls, wood, and minerals.

10. An injection molded product having a decorative surface, characterized in that it has a multilayer structure consisting of a plastic base layer (4), a cover layer (2) located on one side of the base layer (4), and a plurality of decorative elements (3), the plurality of decorative elements (3) being arranged between the base layer (4) and the cover layer (2) and also embedded in the base layer (4) and the cover layer (2), The base layer (4) is made of injection-moldable plastic material, The covering layer (2) is made of a transparent or translucent material and has a thickness of 0.1 mm to 5 mm, The decorative elements (3) are distributed on the cover layer (2) according to a predetermined pattern or in a random arrangement and form a decorative layer, and On the outside of the injection-molded product, the decorative element (3) and the covering layer (2) together form a decorative surface.

11. The injection molded product according to claim 10, wherein The decorative element (3) is made of waste products and natural materials.

12. The injection molded product according to claim 10, wherein The decorative element (3) is selected from the group of the following materials: wood chips, metal shavings, metal chips, plastic waste, paper scraps, carbon fiber, glass fiber or basalt fiber, textile waste, metal foil waste, paint waste or available natural materials.

13. The injection molded product according to claim 10, wherein A multilayer structure (5') comprising a base layer (4), an intermediate layer with a decorative element (3), and a cover layer (2), and a second structure comprising a base layer (4'), an intermediate layer with a decorative element (3'), and a cover layer (2') are formed, wherein the outer base layer (4) is made of transparent or translucent plastic.

14. The injection molded product according to claim 10, wherein The decorative surface is covered with a paint layer.

15. The injection molded product according to claim 12, wherein The natural materials that can be used are gravel, snail shells, mussels, fruit bowls, wood, and minerals.

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