Skirt-free composite material flat plate protective shell and process thereof

Abstract

The invention discloses a skirt-edge-free composite material panel protection shell and a process thereof, and relates to the technical field of electronic product protection shell production, and the panel protection shell is composed of an appearance material layer, a composite material plate and a lining material layer; the preparation process of the flat plate protection shell comprises two parts of preparation of a composite material plate and veneer pasting of the plate, and the preparation of the composite material plate further comprises material lamination, molding and curing and demolding CNC trimming; and the board veneer gluing comprises the steps of primer brushing, edge covering and forming and lining microfiber hot pasting. Compared with a traditional process needing eight steps, the process only needs six steps, the technological process is short, efficiency is high, materials do not need to be transferred many times in the whole process, and therefore the positioning difficulty is low, the size precision of products is improved, the quality of the products produced in multiple batches is stable and controllable, and meanwhile due to the fact that transferring many times is not needed, the production cost is reduced. Therefore, manpower is saved, the quality problem in the machining process is solved, and machining time is saved.

Description

Technical Field

[0001] The invention relates to the technical field of production of electronic product protective shells, in particular to a composite material flat plate protective shell without skirt and a process thereof. Background Art

[0002] In the traditional iPad protective case production process, due to the limitations of the skinning process, a circle of leather skirt will be produced after the surface skinning process. Therefore, manual assistance is required to cut the excess skirt, which will cause a certain amount of material waste. At the same time, in order to maintain the appropriate fitting strength, a certain width of skirt will be retained, thus causing appearance problems and certain labor costs.

[0003] At present, the edge of tablet protective case products is mainly made by gluing the upper and lower layers of leather, which has a large skirt problem in appearance and the process is relatively complicated. The required process steps are as follows: Part 1: Preparation of composite panels Step 1: Material stacking: According to product requirements, the stacking design of composite material plates is carried out. The materials used can be resin-based fiber-reinforced composite materials. The resin can be thermosetting resins such as epoxy resin and bismaleimide, or thermoplastic resins such as PC and PA. The fibers can be glass fiber, aramid fiber or carbon fiber, etc.; Step 2: Forming and curing: Place the laminated composite material wet embryo (uncured) into the corresponding metal mold, and pressurize and cure it according to the designed process parameters (temperature: 100-200℃, pressure: 1-10MPa), and keep the pressure for about 5-30 minutes; Step 3: Demolding CNC trimming: Take out the 100% cured sheet and use CNC to trim the edge to get a better-looking edge; Part 2: Sheet metal veneer Step 1: Pre-lamination of lining microfiber: pre-lamination of adhesive film and microfiber, and hot pressing for a period of time (1-100s). After hot pressing, transfer the microfiber sheet with adhesive backing to the cold press machine, and keep the pressure and cool down for 1-100s; Step 2: Pre-pressing the elastic sheet: pre-laminate the adhesive-backed microfiber sheet and the elastic sheet together, position the hollow release film between the elastic sheet and the microfiber, and place it on the hot pressing and shaping machine for 1-100 seconds; Step 3: Lining microfiber contour cutting: Use the contour die to cut off the excess edge material, retain the product area, and remove the release film. In the area with the release film, the microfiber will not stick to the elastic sheet; Step 4: Hot-sticking of composite material board: pre-shape the board and the semi-finished product in the previous step, put them into the hot press, keep them warm and pressurized for 1-100s, and cool them down with cold air; Step 5: Leather bonding: Place the semi-finished product from the previous step into a molding fixture with a mold cavity, and bond the adhesive-backed leather, then transfer them to the hot press machine, heat and hold the pressure for 1-100s, then transfer them as a whole to the cold press machine, hold the pressure and cool for 1-50s to shape, and take out the product.

[0004] From the above, it can be seen that the whole process involves many steps (eight steps are required), each step will produce certain defects, the cumulative defect rate will be large, and the production efficiency is low and the cycle is long. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a composite material flat plate protective shell without skirt and a process thereof, which solves the problems raised by the above-mentioned background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: A composite material flat protective shell without skirt, comprising: An appearance material layer, wherein a plurality of recessed portions are reserved inside the appearance material layer; A composite material plate, wherein the composite material plate is provided in plurality and fixed correspondingly inside each recessed portion; A plurality of lining material layers are provided and fixed correspondingly on the surface of each composite material plate.

[0007] Furthermore, the appearance material layer is set to be a soft rubber material or a hard rubber material, the soft rubber material is silicone or PU, and the hard rubber material is PC.

[0008] Furthermore, the composite material plate is a composite structure of resin and fiber, the resin is epoxy resin or bismaleimide thermosetting resin or PC, PA thermoplastic resin, and the fiber is glass fiber or aramid fiber or carbon fiber.

[0009] Furthermore, the lining material layer is made of superfiber material.

[0010] The preparation process of the above-mentioned composite material flat protective case without skirt comprises the following steps: A. Preparation of composite material panels A1. Material stacking: stacking resin and fiber together to form a composite material wet embryo; A2. Molding and curing: Put the laminated composite material wet embryo into a metal mold and pressurize and cure it to obtain a cured sheet; A3. Demolding and CNC trimming: Take out the 100% cured sheet and use CNC to trim the edge to get a composite material sheet; B. Sheet veneer B1. Apply primer: Apply primer to the parts of the composite material board that need to be bonded; B2. Edge wrapping: fix the composite material board with primer on the core mold in the mold, put the raw material of the appearance material layer into the mold cavity, perform hot pressing and curing, and hot press the raw material of the appearance material layer on the surface of the composite material board; B3. Thermal bonding of lining with ultra-fiber: Lay the cut lining material layer near the parting line and cover the parting line, then transfer the whole to the hot pressing mold, put it on the hot pressing machine for bonding, and keep the pressure at a certain temperature, then cool down, and then demold to get a composite material flat protective shell without skirt.

[0011] Furthermore, in step A2, the temperature of pressurized curing is 100-200° C., the pressure is 1-10 MPa, and the holding time is 1-30 min.

[0012] Furthermore, in the step B1, the primer is an adhesive having an epoxy component or an acrylic component.

[0013] Furthermore, in step B2, the temperature of the mold hot pressing curing molding is 1-200° C., the mold closing speed is 1-10 mm / s, and the time is 0.1-30 min.

[0014] Furthermore, in step B3, the temperature of hot pressing is 1-150° C. and the pressure is 0.1-10 MPa.

[0015] Furthermore, the edge of the flat protective shell product obtained in step B3 will have a process boss to prevent demoulding damage and improve the yield, and the process boss will be shielded by the lining material layer.

[0016] The present invention provides a composite material flat protective case without skirt and a process thereof. Compared with the prior art, it has the following beneficial effects: 1. Compared with the traditional process which requires 8 steps, this process only requires 6 steps, with a short process flow and high efficiency; 2. The whole process does not require multiple material transfers, so the positioning difficulty is low, and the dimensional accuracy of the product is improved, and the quality of multi-batch production of products is stable and controllable; 3. Since there is no need for multiple transfers, it can save manpower, solve quality problems during processing, and save processing time; 4. Changing the original operation method that required 6-8 sets of tooling, fixtures and molds, this preparation process only requires 3-4 sets of tooling and molds. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the disassembled structure of the tablet protective case in the present invention; Figure 2 This is a schematic diagram of the assembly structure of the tablet protective case of the present invention; Figure 3 This is a schematic diagram of the process of step B2 in the preparation process of the present invention; Figure 4 It is a partial schematic diagram of the product obtained in step B3 of the preparation process of the present invention, which has a process boss and a parting line; Figure 5 It is a partial schematic diagram of the lining material layer shielding the parting line in the final product of the present invention.

[0018] In the figure: 1. Appearance material layer; 11. Depression; 2. Composite material plate; 3. Lining material layer; 4. Hot pressing mold; 5. Parting line; 6. Process boss. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] See also Figure 1 , 2 The present invention provides a technical solution: a composite material flat plate protective shell without a skirt, which is composed of an appearance material layer 1, a composite material plate 2 and an inner lining material layer 3, wherein a plurality of recessed portions 11 are reserved inside the appearance material layer 1, a plurality of composite material plates 2 are provided and fixed correspondingly inside each recessed portion 11, and a plurality of inner lining material layers 3 are provided and fixed correspondingly on the surface of each composite material plate 2.

[0021] Also, see Figure 3 , 4 5. The preparation process of the above-mentioned composite material flat protective case without skirt comprises the following steps: A. Preparation of composite material panels A1. Material stacking: According to product requirements, the stacking design of composite material plates is carried out. The materials used can be resin-based fiber-reinforced composite materials. The resin can be thermosetting resins such as epoxy resin and bismaleimide, or thermoplastic resins such as PC and PA. The fibers can be glass fiber, aramid fiber or carbon fiber, etc.; A2. Molding and curing: Place the laminated composite material wet embryo (uncured) into the corresponding metal mold, and pressurize and cure it according to the designed process parameters (temperature: 100-200℃, pressure: 1-10MPa), and keep the pressure for about 0.1-30min; A3, demoulding CNC trimming: take out the 100% cured sheet and use CNC to trim the edge to get a better-looking edge; B. Sheet veneer B1. Apply primer: Apply primer to the parts of the composite material board that need to be bonded. The primer can be an adhesive such as epoxy component or acrylic component to enhance the bonding strength between the leather and the composite material board. B2. Edge wrapping: The selected soft material can be soft rubber materials such as silicone, PU, ​​or plastic hard rubber materials such as PC. Fix the composite material sheet on the core mold in the mold 4, and then put the raw material of the soft material into the mold cavity. At this time, the mold is heated to a temperature of 1-200°C, depending on the softening point or curing temperature of the material. Close the mold at a closing speed of 1-10mm / s, wait for 0.1-30min, and take out the material after it is cured (such as attached Figure 3 shown); B3, Lining microfiber thermal paste: Cut the microfiber with adhesive backing into shape and paste it near the mold line 5 to cover the mold line (such as the attached Figure 4 and 5 As shown), and transferred as a whole to the hot pressing mold, put on the hot pressing machine for bonding, maintain pressure at a certain temperature, and then maintain pressure and cool down. The temperature range of the heating section is 1-150℃, and the pressure range is 0.1-10MPa. The product is demoulded. The edge of the product will have a process boss 6 to prevent demoulding damage and improve the yield. This boss will be covered by the lining.

Claims

1. A composite flat protective case without skirt, characterized in that: include: An appearance material layer (1), wherein a plurality of recessed portions (11) are reserved inside the appearance material layer (1); A composite material plate (2), wherein the composite material plate (2) is provided with a plurality of plates, which are correspondingly fixed inside each recessed portion (11); A lining material layer (3), wherein a plurality of lining material layers (3) are provided and fixed correspondingly on the surface of each composite material plate (2).

2. The composite flat protective case without skirt according to claim 1, characterized in that: The appearance material layer (1) is configured to be a soft rubber material or a hard rubber material. The soft rubber material is made of silicone or PU, and the hard rubber material is made of PC.

3. The composite flat protective case without skirt according to claim 1, characterized in that: The composite material plate (2) is a composite structure of resin and fiber, the resin is epoxy resin or bismaleimide thermosetting resin or PC, PA thermoplastic resin, and the fiber is glass fiber or aramid fiber or carbon fiber.

4. The composite flat protective case without skirt according to claim 1, characterized in that: The lining material layer (3) is made of superfiber material.

5. The composite flat protective shell without skirt according to any one of claims 1 to 4, characterized in that: The preparation process includes the following steps: A. Preparation of composite material panels A1. Material stacking: stacking resin and fiber together to form a composite material wet embryo; A2. Molding and curing: Put the laminated composite material wet embryo into a metal mold and pressurize and cure it to obtain a cured sheet; A3. Demolding and CNC trimming: Take out the 100% cured sheet and use CNC to trim the edge to get a composite material sheet; B. Sheet veneer B1. Apply primer: Apply primer to the parts of the composite material board that need to be bonded; B2. Edge wrapping: fix the composite material board with primer on the core mold in the mold, put the raw material of the appearance material layer into the mold cavity, perform hot pressing and curing, and hot press the raw material of the appearance material layer on the surface of the composite material board; B3. Thermal bonding of lining with ultra-fiber: Lay the cut lining material layer near the parting line and cover the parting line, then transfer the whole to the hot pressing mold, put it on the hot pressing machine for bonding, and keep the pressure at a certain temperature, then cool down, and then demold to get a composite material flat protective shell without skirt.

6. The process for preparing the composite flat protective case without skirt according to claim 5, characterized in that: In the step A2, the temperature of pressurized curing is 100-200° C., the pressure is 1-10 MPa, and the holding time is 1-30 min.

7. The process for preparing a composite material flat protective case without skirt according to claim 5, characterized in that: In the step B1, the primer is an adhesive having an epoxy component or an acrylic component.

8. The process for preparing a composite material flat protective case without skirt according to claim 5, characterized in that: In the step B2, the temperature of the mold hot pressing curing molding is 1-200° C., the mold closing speed is 1-10 mm / s, and the time is 0.1-30 min.

9. The process for preparing a composite material flat protective case without skirt according to claim 5, characterized in that: In the step B3, the temperature of hot pressing is 1-150° C. and the pressure is 0.1-10 MPa.

10. The process for preparing a composite material flat protective case without skirt according to claim 5, characterized in that: The edge of the flat protective shell product obtained in step B3 will have a process boss to prevent demoulding damage and improve the yield. The process boss will be shielded by the lining material layer.

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