KR101522838B1 - Forming method for case of mobile device - Google Patents

Abstract

The present invention relates to a method of forming a casing of a mobile device, the method including impregnating at least one layer of fiber fabric with a thermoplastic resin or laminating a thermoplastic resin sheet, , And optionally an adhesive layer is interposed therebetween to laminate the natural or artificial decorative layer. The natural or artificial decorative layer is preheated and placed in a heated mold, According to the present invention, it is possible to form a mobile device casing of various three-dimensional shapes in a simple, efficient and economical manner, Pattern, and optionally cork, or natural or artificial leather, or the texture and pattern of silk or various elastomers is free It has a high degree of freedom of design and has a high degree of impact resistance, sufficient strength and light weight, and is satisfactory in spite of the thinness of the case. A separate buffing (polishing) process for obtaining high gloss High-gloss can be achieved without any process, and the forming body can be applied directly to the insert double injection for attaching the assembly portion or for forming the surface layer.

Description

FORMING METHOD FOR CASE OF MOBILE DEVICE [0002]

The present invention relates to a method of forming a mobile device case, and more particularly, to a method of forming a thin film by impregnating at least one fiber fabric with a thermoplastic resin or by laminating a thermoplastic resin sheet and nip- (Thin), and optionally an adhesive layer is interposed therebetween to laminate the natural or artificial decorative layer, preheat the natural or artificial decorative layer, place it in a heated mold, close the mold, The present invention relates to a method of forming a mobile device case that is formed into a predetermined shape that is formed by cooling a mold and then forming a mold. The manufacturing method according to the present invention is capable of forming a mobile device case simply, efficiently, Not only can the texture and pattern of the fabric be realized as it is, but it is possible to make it into a casing, and a separate A high gloss can be achieved without a post-treatment such as a buffing or polishing process, thinning and impact resistance can be imparted to a satisfactory degree, and optionally, surface treatment can be further performed.

Today, various mobile devices such as smart phones and tablet PCs have excellent mobility, processing capability, and control characteristics, so that they can download and / or upload various information anytime and anywhere The utilization rate and frequency of use of modern people are rapidly expanding.

Such a mobile device is inherently easy to carry, which is one of its main characteristics, and it is in a trend of thinning and thinning (thinning and shrinking) in spite of rapid increase in functionality according to the development of electronic technology.

However, it is believed that the thinning of the outer case according to the prior art as a part to meet the trend of short and light weight of the mobile device described above is not limited to a thickness lower than the sacrifice in consideration of strength or impact resistance come.

In addition, the thickness of the resin material housing case having a size of a mobile phone such as a pitcher phone or a smart phone, which is particularly small in general, is generally at least 0.8 mm or more, And a thickness of about 2 mm is generally required for a resin case having a size of about 20 inches such as a notebook. Examples of the material for the case for a mobile device include a polycarbonate (PC), a thermoplastic resin, (PA), acrylonitrile butadiene styrene (ABS), alloys of PA and ABS, or glass fiber chops as a filler are homogeneously and simply mixed with the aforementioned resin raw materials. .

The applicant of the present invention has implemented a case for mobile phone having a thickness of about 0.6 mm by a resin transfer molding method (RTM: Resin Transfer Molding method) using a glass fiber fabric as a conventional method for overcoming the limitations of the above- According to one prior art, it is difficult to realize an outer case for a mobile device having a thickness less than that, and further, various natural or artificial decorative patterns other than the glass fiber fabric pattern can not be realized.

According to the prior art by the above-mentioned resin transfer molding method in which the glass fiber raw material piece by the applicant is integrated with the resin layer, the tensile strength of the external case for a mobile device is made of only thermoplastic water, or the glass fiber cloth as a filler is homogeneously Although the resin transfer molding method described above achieves a tensile strength improvement of about 4 times as much as that in the case of incorporating the resin into the glass fiber raw material, The method and apparatus are complicated and expensive, and the manufacturing efficiency is not sufficiently satisfactory.

Therefore, a first object of the present invention is to provide an efficient and economical forming method of a thinned mobile device case having a sufficiently satisfactory impact resistance, strength and light weight.

It is a second object of the present invention to provide a method of forming a mobile device casing that is effective in providing a formed body that can be directly applied to the dual injection of an assembly component or a surface layer.

A third object of the present invention is to provide a method of forming a case of a mobile device capable of achieving high gloss without a post-processing such as a separate buffing or polishing process for obtaining high gloss.

A fourth object of the present invention is to provide a method and a device for designing various textile fabric textures and patterns in addition to the above-mentioned first object, and selectively providing textures and patterns such as wooden materials such as cork, natural or artificial leather, silk or rubber, To provide a method of forming a mobile device case.

A fifth object of the present invention is to provide a method of manufacturing a fiber-reinforced plastic sheet, which comprises selectively providing a functional portion such as a carrier or an antenna for supporting an information transmitting portion such as a letter or a logo on a surface layer portion, To form a desired shape of 2D or 3D together with a case in the case of a mobile device case.

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According to a preferred aspect of the present invention to achieve the first to third objects of the present invention as described above, (A) at least one ply fabric is impregnated with a thermoplastic resin, (B) a step of thinning the thermoplastic resin impregnated fiber fabric, (C) a preheating step, (D) a step of placing the thermoplastic resin impregnated fiber fabric in a mold heated to 120 to 160 DEG C, ) And press forming to form a mobile device casing.

According to another aspect of the present invention, there is provided a method of manufacturing a thermoplastic resin sheet, comprising the steps of: (A) forming a thermoplastic resin sheet on at least one surface of a top surface and a bottom surface of each of at least one ply fiber fabric, (B) thinning the thermoplastic resin sheet laminated fiber cloth; (C) preheating; and (D) placing the thermoplastic resin sheet in a mold heated to 120 to 160 ° C to mold A mold is closed, and a mold is formed by pressurizing the mold.

Here, the at least one layer of the fiber fabric is formed of a fabric or non-fabric glass fiber, carbon fiber, aromatic polyamide fiber such as Kevla, or aramid fiber .

The thermoplastic resin may be polyurethane (PU), polymethylmethacrylate (PMMA), polyamide, or polycarbonate.

In the impregnation step, it is preferable that at least one fiber fabric drawn out from at least one fiber fabric roll is continuously passed through a guide roll to the liquid thermoplastic resin reservoir in terms of process efficiency.

The above-described thermoplastic resin sheet lamination step may be performed by continuously stacking a fiber fabric and a thermoplastic resin sheet drawn from at least one fiber fabric roll and at least one thermoplastic resin sheet roll.

In addition, the thinning step may be performed by nip pressing in which at least one layer of fabric is pressed through a nip between the upper and lower press rolls in terms of process efficiency.

The thickness of the thermoplastic resin impregnated fiber fabric after nip pressing in the thinning step is 0.1 to 0.5 mm, preferably 0.3 to 0.4 mm.

Also, it may be desirable to use at least two layers of fiber fabric in the impregnation step and lamination in the thinning step.

Also, the at least one layer of the fiber fabric may be laminated on a stainless steel thin plate.

Following the thinning step, a fiber original piece formation step is performed in which the fiber fabric is cut to a predetermined size.

In addition, following the step of forming the fiber raw material piece, a piercing step of placing the transferring and fixing pins on the raw fiber piece can be performed.

In order to accomplish the fourth object of the present invention, a natural or artificial decorative layer (sheet) is applied on the upper surface of the decorative sheet after the thinning step or the fiber element piece forming step A decorative layer laminating step for laminating can be performed.

The natural or artificial decorative layer may be natural wood or an elastomer such as natural or artificial leather or rubber, silk.

Here, the thickness of the decorative layer is 0.1 to 0.4 mm.

The above natural wood may be cork.

It is preferable that the preheating step is performed at a preheating temperature of 160 to 220 ° C and a preheating time of 30 to 60 seconds.

In addition, the preheating method in the preheating step may be performed by infrared, far-infrared irradiation, high-frequency irradiation, hot air flow, or direct heating.

In the forming step, it is preferable that the mold is pressed at a pressure of 1 to 3 ton / cm ² and pressed for 40 to 120 seconds.

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According to a preferred embodiment of the present invention, a resin-impregnated fiber fabric constituting a resin-impregnated fiber fabric laminate or a surface layer portion of a fiber fabric laminated with a thermoplastic resin sheet (not shown) A carrier or an antenna is heated and pressed together in a mold in a state where a function portion such as a carrier or an antenna for holding an information transmitting portion such as a character or a logo is included in an intermediate layer or a lower layer portion to form a desired shape of 2D or 3D Can simultaneously form together.

Following the above step (D), the step of cooling the mold (E) and then taking out a formed body for the mobile device casing is performed.

The mold cooling temperature in the step (E) is in the range of 50 to 70 占 폚.

Following the above step (E) (F), a trimming step is performed.

If necessary, it may optionally perform putty application, primer, liner, polishing, or top coating formation following the above trimming step (F).

If necessary, insert double injection may also be performed using a foaming body.

As described above, according to the forming method of the mobile device case according to the present invention, it is possible not only to form the mobile device cases of various three-dimensional shapes easily, efficiently, and economically, Has a high degree of design freedom because it can freely embody the texture and the pattern of natural wood, artificial leather, silk, or various elastomers, such as cork, and has a sufficiently satisfactory impact resistance It has high strength and light weight and can be made high in gloss without a post-treatment such as a separate buffing or polishing process for obtaining high gloss. The formed body can be used for insert injection or double insert injection for forming a surface layer You can apply it directly.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sequential process diagram illustrating the lamination process of a textile fabric in a forming method of a mobile device case according to the present invention; FIG.
FIG. 2 is another continuous process drawing showing a process of laminating a fiber fabric in a forming method of a mobile device case according to the present invention.
3A to 3D are exemplary cross-sectional views showing the structure of a fiber raw laminates produced by a continuous process.
FIGS. 4A to 4F are schematic views illustrating a process of forming a fiber fabric laminate in a method of forming a case of a mobile device according to the present invention.
5A to 5C are photographs of an example of a formed body manufactured by a forming method of a mobile device case according to the present invention.

The term " mobile device " used throughout the specification of the present invention refers to a cellular phone, an MP3 (Moving Pictures Experts Group) -1 Audio Layer-3, a PMP (Portable Media Player) , A personal digital assistant (PDA), a laptop, a mini-notebook, an ultra-mobile personal computer (UMPC), a tablet PC, a smart phone, a navigation device, Portable, electronic dictionary, and the like, and is capable of uploading and / or downloading information.

The term " forming " is defined to form at least one layer of resin-impregnated fiber fabric, optionally a decorative layer laminated thereon, in a heating mold to shape into a predetermined shape, formed body " is a general form of a mobile device case shaped in the above-described predetermined form, but it is not limited thereto and may be a specific molded product.

The term " fiber fabric " is defined to mean a variety of natural, synthetic, or blended fibers of a fabric or non-fabric and is preferably glass fiber, carbon fiber, kevla ), Or an aramid fiber.

Hereinafter, the manufacturing method of the present invention will be described in more detail with reference to the accompanying drawings.

1 is a sequential process drawing showing a laminate process of resin impregnated fiber fabrics 11, 12 and 13 in a forming method of a mobile device case according to the present invention, Fig. 2 is another process drawing, Figs. 3a to 3c 4a-4f illustrate a mold 60 of the resin-impregnated fiber fabric laminates 10,10a, 10b prepared according to Fig. 1 or 2, 5A to 5C are photographs of forming bodies 1, 1a, and 1b, respectively, formed by a forming method of a mobile device case according to the present invention. For convenience, we will mention together.

The method of forming a mobile device case according to the present invention as shown in Fig. 1 comprises the steps of impregnating at least one ply of fiber fabrics 11a, 12a and 13a with a resin liquid 21, (11, 12, 13) is thinned by using a set of laminating rolls (35, 35a), and this is preheated by using a preheater (50) And is formed by molding, pressing, and forming.

2, at least one of the upper and lower surfaces of the ply fibrous fabric (see reference numerals 11a and 12a in Fig. 1) and the stainless steel thin plate 15 A step of laminating the thermoplastic resin sheet 16 on one side, preferably in the middle thereof, with an adhesive layer interposed therebetween, and a step of thinning the laminated fiber cloth by using a pair of laminating rolls 35 and 35a And a step of preheating the same using a preheater 50 and a step of placing the mold in a heated mold 60 and molding the mold 60 and pressing the mold 60 to form the mold 60. In comparison with the above case, Except that the thermoplastic resin sheet 16 is laminated on at least one surface of the upper and lower surfaces instead of impregnating the fiber fabric (see 11a and 12a in Fig. 1) and the stainless steel foil 15 into the resin liquid 21 And essentially The same foaming method is applied and it is needless to say that the fiber cloth 13a can be used without using the stainless steel thin plate 15. If used, the thickness of the stainless steel thin plate 15 is 0.1 to 0.3 mm, 0.1 to 0.2 mm.

The at least one layer of fabric 11a, 12a, or 13a described above may be formed of any of a variety of natural or man-made fibers of a nonwoven or nonwoven fabric, but may be glass fiber, carbon fiber, or aramid (aramid) fibers can be preferably applied in the present invention.

The above resin may be a thermoplastic resin such as polyurethane (PU), polymethyl methacrylate (PMMA), polyamide (PA), or polycarbonate (PC)

1, the impregnation of the resin liquor 21 with the fiber lobes 11a, 12a and 13a is carried out by using at least one fiber drawn from at least one fiber fabric roll (not shown) Is performed by continuously passing the raw materials 11a, 12a and 13a into the liquid thermoplastic resin reservoir 20 by the guide roll 31 and the deposition roll 32. [

1, the resin-impregnated fiber fabric 11 (11, 12, 13) impregnated with the resin liquid 21 is guided by a pair of guide rolls 33, 33a, and then a set of preliminary lamination rolls Are formed into a laminated sheet by being gathered together by the laminating rolls (34, 34a), and then thinned by press passing between nips formed by a pair of laminating rolls (35, 35a).

2, the fiber cloths 11 and 12, the stainless steel thin plate 15, and the thermoplastic fiber sheet 16 interposed therebetween are guided by a pair of guide rolls 33 and 33a, respectively, After being guided, they are gathered together by a pair of preliminary lamination rolls 34, 34a to form a laminated sheet, and then pressure is passed between nips formed by a pair of laminating rolls 35, 35a, do.

1 shows an example in which three fiber fabrics 11a, 12a and 13a are used to form three layers. However, the forming method of the present invention is not limited to this, and one or two or more May be used, which is optional in the present invention.

For example, in the case of using only one fiber fabric 11a, only the thinning is performed without lamination. When two or more fiber fabrics 11a, 12a or 11a, 12a, 13a etc. are used, And thinning are simultaneously performed.

When the thinning by the above-mentioned nip pressing is performed, the thermoplastic resin liquid 21 is hardened in a state of being homogeneously infiltrated into the fiber ends 11a, 12a and 13a, and the resin impregnated fiber fabric 10 , And 10b are dependent on the number of layers to be used, the thickness is 0.1 to 0.5 mm when one to three layers are used, and preferably 0.3 to 0.4 mm from the standpoint of ensuring sufficient strength.

On the other hand, in the method of laminating a thermoplastic resin sheet (not shown) on at least one surface of at least one of the upper and lower surfaces of the ply fiber fabrics 11a, 12a and 13a, The thermoplastic resin sheet is laminated to the middle or middle and the upper surface or the lower surface of the thermoplastic resin sheet through, for example, adhesion. When the lamination rolls 35 and 35a as described above are used, (Thinned) and forms according to the same method and conditions. Therefore, the description of the same portion will be omitted.

In this case, however, the step of laminating the thermoplastic resin sheet described above is carried out by using the fiber fabrics 11a, 12a, 13a drawn out from at least one fiber fabric roll (not shown) and at least one thermoplastic resin sheet roll (not shown) A resin sheet (not shown) is laminated by a pair of preliminary lamination rolls 34 and 34a as described above via an adhesive layer, and is continuously thinned and laminated by a pair of laminating rolls 35 and 35a do.

Following the thinning, the resin-impregnated fiber fabric laminates 10, 10a and 10b are cut to predetermined dimensions using a cutter 39 to form a fibrous piece or a laminate piece (not shown) .

Meanwhile, in the illustrated example, the natural or artificial decorative layer 14 is laminated on the upper surface via an adhesive layer (not shown) after the thinning process or the process of forming the laminated piece (fiber raw piece) Which is optional in the present invention.

In the illustrated example, after thinning and / or laminating, an adhesive is applied to the top surface using an adhesive applicator, and then the natural or artificial leather or cork sheet drawn from the decorative layer (decorative sheet) (Decorative sheet) 14 made of an elastomer such as natural wood or a rubber having a specific pattern such as silk or the like is pressed and passed between the nips of a pair of the lamination rolls 38 and 38a, The resin-impregnated fiber raw material laminate 10b having the decorative layer 14 is formed, and the thickness of the decorative layer stacked is about 0.1 to 0.4 mm.

Next, the resin impregnated fiber raw material laminates 10b having the decorative layer 14 are cut to predetermined dimensions using the cutter 39 as described above to form laminate pieces (not shown).

The processes of thinning and / or laminating and / or laminating the decorative layer 14, and cutting the fiber pieces into a predetermined size may be performed in an intermittent manner, but are performed in a continuous system in terms of process efficiency Lt; / RTI >

FIG. 3A shows a case in which a resin-impregnated fiber raw material laminate 10 formed by thinning and laminating two layers of resin impregnated fiber materials 11 and 12 is formed. FIG. 3B shows a case where a three layer resin- The resin impregnated fiber raw fabric laminates 10a formed by thinning and laminating the resin impregnated fiber fabric layers 11 and 12 are thinned and laminated, And FIG. 3 (d) shows a resin-impregnated fiber raw fabric laminate 10b formed by laminating a decorative layer 14 on the upper surface thereof. FIG. Impregnated fiber fabric laminates 10c formed by thinning and laminating the thermoplastic resin sheets 16 on the upper surface of the thermoplastic resin sheet 16 and laminating the decorative layer 14 on the upper surface thereof, It was.

However, in the present invention, only a single layer of the resin-impregnated fiber fabric 11 may be thinned, and the decorative layer 14 may be laminated thereon, or three layers of the resin- The decorative layer 14 may be laminated on the resin-impregnated fiber material laminates using the resin-impregnated fiber material 13, 13, and in some cases, four or more resin-impregnated fiber materials 11, 12, 13, As described above.

Next, a forming process of shaping the resin-impregnated fiber raw material laminates 10, 10a, 10b with the deposited thermoplastic resin in a cured state into a predetermined shape using the mold 60 is shown in Figs. 4A to 4F For convenience of explanation, the laminate piece will be referred to as reference numeral 10 for resin-impregnated fiber raw laminates.

Fig. 4A shows a step of piercing a resin-impregnated fiber end laminate 10 in the form of a laminate piece cut into a predetermined dimension with a plurality of conveying and fixing pins 40. Fig.

4B shows a state in which the resin-impregnated fiber fabric laminates 10 pierced by the transfer and fixing pins 40 are preheated at a preheat temperature of 160 to 220 DEG C, preferably 170 to 180 DEG C, Impregnated fiber raw material laminate 10 which is preheated to a preheating time of 30 to 60 seconds, preferably 35 to 40 seconds to allow subsequent foaming to be smoothly performed in a short time by melting or softening the cured thermoplastic resin Indicating the preheating step.

The preheating method may be performed using various known heating means such as infrared, far-infrared irradiation, high-frequency irradiation, hot air flow, direct heating, or the like.

4C shows a heating step of the mold 60. The upper mold 61 and the lower mold 62 having the guide holes 61a into which the transfer and fixing pins 40 are inserted are heated at a temperature of 120 to 160 DEG C The resin-impregnated fiber raw material laminate 10 preheated by the preheater 50 is placed between the upper mold 61 and the lower mold 62 while being heated to a temperature of about 135 to 140 ° C.

4D and 4E illustrate the foaming step with the mold 60. The upper mold 61 and the lower mold 62 are pressurized at a pressure of 1 to 3 ton / cm ² , specifically 1.5 to 2.5 ton / cm ² and held for 40 to 120 seconds, particularly 65 to 75 seconds, to form a 2D resin-impregnated fiber fabric laminate 10 as a 3D forming body 1 for manufacturing a mobile device case The upper mold 61 and the lower mold 62 are cooled to a temperature of 50 to 70 占 폚, specifically, 60 to 65 占 폚 to cure the thermoplastic resin in the forming body 1 described above.

Next, FIG. 4F shows a mold opening step for separating the upper mold 61 and the lower mold 62, and takes out the completed forming body 1 for a mobile device casing.

Examples of various forming bodies manufactured by the foaming method for a mobile device casing according to the present invention are shown in Figs. 5A to 5C, and Fig. 5A is a cross-sectional view showing a state in which the resin impregnation (Fig. For the forming body 1 using only the fiber fabric laminates, the decorative surface 2 is represented by the pattern and texture of the fiberglass fabric.

In the figure, reference numeral 3 denotes a burr.

Fig. 5b is for a foaming body 1a using a resin-impregnated fiber material laminate in which natural leather is laminated as a decorative layer (refer to reference numeral 14 in Figs. 1 and 2), in which the decorative surface 2 is a natural leather 14a, And a pattern and a texture of FIG.

Fig. 5c is for a foaming body 1b using a resin-impregnated fiber material laminate in which cork foil is laminated as a decorative layer (refer to reference numeral 14 in Figs. 1 and 2). When the decorative surface 2 is a cork 14b, And a unique case implemented with the pattern and texture of the text.

The above-described forming bodies (1, 1a, 1b) are subjected to a step of removing burrs by trimming using a suitable known means such as a CNC laser apparatus.

If necessary, a post-processing step such as a putty application, a primer, a liner, a polishing, or a top coating may be optionally performed subsequent to the above-mentioned trimming step Of course.

Such a post-processing step may be carried out in accordance with design specifications such as a glossy or non-scratch surface, scratch-resistant surface, etc., or a scratch-resistant treatment on the surface or, if necessary, the attachment of the assembly to the foaming bodies (1, 1a, 1b) It is also possible to perform insert double injection for forming other surface layers or the like.

In the present invention, although not shown, the surface layer portion, intermediate layer portion or lower layer portion of the resin-impregnated fiber fabric layers 11, 12 and 13 constituting the resin-impregnated fiber fabric laminate 10, 10a and 10b, A functional portion such as a carrier or an antenna that carries an information transmitting portion such as a character or a logo is included in a surface layer portion or an intermediate layer portion or a low layer portion of the fiber cloths 11a, 12a, The resin or the resin sheet is melted to be homogeneously infiltrated into the fiber fabric by the heating and pressurization, and the resin or the resin sheet is uniformly infiltrated into the fiber fabric, , Which is also within the scope of the present invention.

In this case, it is of course possible to form a surface coating layer as a colored coating layer or a top coat layer to cover or compensate for a heterogeneous pattern and shape between the fiber cloth and the carrier or antenna if necessary.

Although the present invention has been described in detail with reference to the accompanying drawings, it is to be understood that the present invention is not limited thereto, and various changes and modifications may be suggested to those skilled in the art.

1,1a, 1b: Foaming body
2: decorative surface 3: burr
10, 10a, 10b: resin impregnated fabric laminates
11, 12, 13: thermoplastic resin impregnated fiber fabric
11a, 12a, 13a:
14: Decorative layer (sheet)
14a: Natural leather 14b: Cork
15: stainless steel thin plate 16: thermoplastic resin sheet
20: impregnating cell
21: resin liquid
31: Guide roll 31a: Stainless steel thin plate guide roll
31b: thermoplastic resin sheet guide roll
32: Deposition roll
33, 33a: guide rolls 34, 34a: preliminary lamination roll
35, 35a: Laminating roll 36: Adhesive applicator
37: decorative sheet roll 38,38a: laminated roll
39: Cutter
40: pin for conveying and fixing 50: preheater
60: mold
61: upper mold 61a: guide hole
62: Lower mold

Claims (32)

A method of forming a mobile device case comprising the steps of:
(A) impregnating at least one ply of fiber fabric with a thermoplastic resin;
(B) thinning the thermoplastic resin impregnated fiber fabric;
(C) preheating; And
(D) Positioning the mold in a mold heated to 120 to 160 캜 to mold and press to form. A method of forming a mobile device case comprising the steps of:
(A) laminating a thermoplastic resin sheet on at least one side of at least one of a top surface and a bottom surface of each of at least one ply fiber fabric;
(B) thinning the thermoplastic resin sheet laminated fiber fabric;
(C) preheating; And
(D) Positioning the mold in a mold heated to 120 to 160 캜 to mold and press to form. The method of any one of the preceding claims, wherein said at least one layer of fabric is formed of a fabric or non-fabric fiberglass, carbon fiber, aromatic polyamide fiber, or aramid fiber. Of forming a mobile device case. The method according to claim 1 or 2, wherein said thermoplastic resin is polyurethane (PU), polymethylmethacrylate (PMMA), polyamide, or polycarbonate. 2. The method of claim 1, wherein said impregnating step comprises at least one fiber fabric pulled from at least one fiber fabric roll by the guide rolls continuously into a liquid thermoplastic resin reservoir, Way. 3. The method according to claim 2, wherein the step of laminating the thermoplastic resin sheet is carried out by successively laminating a fiber fabric and a thermoplastic resin sheet drawn from at least one fiber fabric roll and at least one thermoplastic resin sheet roll, . The method of any one of the preceding claims, wherein the thinning step is performed by nip pressing to pass at least one layer of fabric web in a pressurized state through a nip between upper and lower press rolls. How to form the case. The method according to claim 7, wherein the thickness after the nip pressing in the thinning step is 0.1 to 0.5 mm. The method of claim 1 or 2, wherein at least two layers of the fiber fabric are laminated in the thinning step. The forming method of a mobile device case according to any one of claims 1 to 4, wherein a fiber original piece forming step of cutting a fiber fabric to a predetermined size is performed subsequent to the thinning step. The method of claim 1 or 2, wherein said at least one layer of fabric is laminated on a thin stainless steel sheet. 11. The method of claim 10, wherein a piercing step is performed following the step of forming the fiber element piece, wherein the piercing step is performed to place the transferring and fixing pins on the fiber element piece. The method of forming a casing of a mobile device according to claim 1 or 2, wherein a decorative layer-laminating step is carried out after the thinning step, in which a natural or artificial decorative layer is laminated via an adhesive layer. The method according to claim 10, wherein a decorative layer-laminating step of laminating a natural or artificial decorative layer on an upper surface thereof with an adhesive layer is performed subsequent to the fiber original piece forming step. 14. The method of claim 13, wherein said natural or artificial decorative layer is natural wood, natural or artificial leather, silk, or rubber. 16. The method of claim 15, wherein said natural wood is cork. 14. The method according to claim 13, wherein the thickness of the decorative layer is 0.1 to 0.4 mm. The method according to claim 1 or 2, wherein the preheating step is performed at a preheating temperature of 160 to 220 ° C and a preheating time of 30 to 60 seconds. The method according to claim 18, wherein the preheating method in the preheating step is performed by infrared irradiation, far infrared irradiation, high frequency irradiation, hot wind flow, or direct heating. delete The forming method of a mobile device case according to claim 1, wherein the mold is pressed at a pressure of 1 to 3 ton / cm < ² > in the forming step and pressed for 40 to 120 seconds. The method according to claim 1, further comprising the step of heating together the resin-impregnated fiber fabric laminated with the resin-impregnated fiber fabric laminate in the mold in a state in which a carrier or an antenna for supporting letters or logos is included in the surface layer portion, And pressurizing the first and second housings to integrally form. The method of producing a thermoplastic resin sheet according to claim 2, wherein a thermoplastic resin sheet is heated and pressed together in a mold in a state in which a carrier or an antenna for holding a letter or logo is contained in a surface layer portion or an intermediate layer portion or a low- A method of forming a mobile device case that integrally forms a shape. The method according to any one of claims 1 to 3, further comprising, after the forming step (D), a mold cooling step for cooling the mold (E) and then taking out a formed body for a mobile device case Of forming a mobile device case. The method according to claim 24, wherein the mold cooling temperature in the mold cooling step (E) is 50 to 70 占 폚. The method of claim 25, wherein (F) a trimming step is performed following the mold cooling step (E). 27. The method of claim 26, further comprising, after the trimming step (F), a mobile device case forming a putty application, a primer, a liner, a polishing, or a top coating, . The method of claim 24, further comprising: performing insert double injection using the forming body. delete delete delete delete

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