JP6221559B2 - Manufacturing method of housing - Google Patents

Description

The technique which this application discloses relates to the manufacturing method of a housing | casing .

  2. Description of the Related Art Conventionally, a housing manufacturing method is known in which a wooden sheet is impregnated with a thermoplastic resin, and then the wooden sheet is subjected to injection molding to obtain a casing (see, for example, Patent Document 1).

JP 2012-40860 A Japanese Patent Laid-Open No. 11-42602 JP 2012-11749 A

  In the above-described housing manufacturing method, the wooden sheet is impregnated with the thermoplastic resin, and then the wooden sheet is subjected to injection molding, which is a thermal process. Therefore, the glossiness of the thermoplastic resin may appear on the surface of the wooden sheet. is there. Therefore, there is a possibility that the texture of the wood from the wooden sheet may be impaired, and there is room for improvement in order to secure the texture of the wood on the wooden sheet.

  Then, the technique which this application discloses aims at making it possible to ensure the texture of the wood in the wooden sheet which forms a housing | casing as one side surface.

In order to achieve the above object , according to one aspect of the technology disclosed in the present application, a method for manufacturing a housing including an impregnation step and a molding step is provided. In the impregnation step, a plurality of wooden sheets are impregnated with glyoxal. In the molding process, a plurality of wooden sheets to which glyoxal is fixed are stacked and set in a mold. In this molding step, a plurality of wooden sheets are bent together by hot press molding or hot steam press molding using a mold, and the core layer and the decorative layer formed by the plurality of wooden sheets are formed. A housing having is obtained.

  According to the technique disclosed in the present application, it is possible to ensure the texture of wood on the wooden sheet forming the housing.

It is a disassembled perspective view of the electronic device which concerns on 1st embodiment. It is a figure which shows the manufacturing method of the housing | casing which concerns on 1st embodiment. It is a figure which shows the manufacturing method of the housing | casing which concerns on 2nd embodiment.

[First embodiment]
First, a first embodiment of the technology disclosed in the present application will be described.
The first embodiment is a reference example.

  An electronic apparatus 10 according to the first embodiment shown in FIG. 1 is a portable terminal such as a mobile phone or a smartphone as an example, and includes a pair of housings 12 and 14 and an internal unit 16.

  One housing 12 is located on the front side of the electronic device 10, and the other housing 14 is located on the back side of the electronic device 10. One housing 12 is made of resin, and the other housing 14 is formed using a wooden sheet 22 as described later. A display 18 is assembled to one housing 12.

  The other casing 14 is formed in a flat container shape having a square shape in plan view, and an internal unit 16 is accommodated inside the other casing 14. The internal unit 16 includes a configuration for driving the display 18 such as a control board or a battery unit. In a state where the internal unit 16 is housed inside the other housing 14, the pair of housings 12 and 14 are assembled to each other by being engaged with each other at the peripheral edge portions.

  Note that the electronic device 10 is a portable terminal such as a mobile phone or a smartphone as an example, but may be a notebook personal computer or other types of electronic devices.

  Then, the manufacturing method of the above-mentioned housing | casing 14 is demonstrated.

  First, as shown in Step A of FIG. 2, the wooden sheet 22 is impregnated with the medicine 20 containing glyoxal (impregnation step). As an example, the medicine 20 is a mixture of glyoxal and a solvent (water). The chemical | medical agent 20 containing this glyoxal is impregnated by the wooden sheet 22 under vacuum conditions or pressurization conditions, for example by using the vacuum-type or pressurization-type impregnation apparatus 24. FIG. At this time, the wood sheet 22 is impregnated with 10 to 150 wt% of glyoxal. In addition, the material of the wooden sheet 22 can be selected arbitrarily and, for example, cedar or straw is used.

  Next, as shown in Step B of FIG. 2, the wooden sheet 22 is dried using, for example, a drying device 26, and the glyoxal is fixed to the wooden sheet 22 (drying step). Further, before and after the drying step, the wooden sheet 22 is cut into an appropriate shape such as a rectangular shape so that it can be set in a mold 30 described later. In the impregnation process and the drying process of the first embodiment, one wooden sheet 22 is produced for one housing 54.

  Then, as shown in steps C and D of FIG. 2, the wooden sheet 22 is subjected to a molding process involving a bending process (molding process). In the present embodiment, injection molding is performed as an example of molding processing.

  A mold 30 is used for this injection molding. The mold 30 has a core 32 and a cavity 34. A convex portion 36 is formed in the core 32 corresponding to the concave shape of the housing 14, and a concave portion 38 is formed in the cavity 34 corresponding to the concave shape of the housing 14. The core 32 is provided with a sprue 40. The tip (lower end) of the sprue 40 is open to the protruding end surface of the convex portion 36.

  Then, as shown in Step C of FIG. 2, the wooden sheet 22 to which the glyoxal is fixed as described above is inserted into the mold 30. Next, as shown in step D of FIG. 2, molten resin is injected from the sprue 40 into the mold 30 and injection molded. In this way, by performing injection molding in the mold 30, bending of the wooden sheet 22 and integral molding of the wooden sheet 22 and the resin 42 are performed simultaneously. Further, an excess portion of the injection molded casing 14 is removed by trimming.

  By the above procedure, the casing 14 having the wooden sheet 22 impregnated and fixed with glyoxal and the resin 42 integrally formed with the wooden sheet 22 by injection molding is formed. In the case 14, the wooden sheet 22 forms a decorative layer of the case 14, and the resin 42 forms a core layer of the case 14.

  Next, the operation and effect of the first embodiment will be described.

  As described above in detail, according to the first embodiment, when the housing 14 is manufactured, the wooden sheet 22 is impregnated with glyoxal and fixed. Therefore, the strength of the wooden sheet 22 is improved by this glyoxal. As a result, even when injection molding is performed on the wooden sheet 22, the resin penetrates into the wood and cracks occur in the wooden sheet 22, or cracks occur in the three-dimensional bent shape portion of the wooden sheet 22 such as a curved portion or a drawn portion. Occurrence of wrinkles and the like can be suppressed. As a result, the yield (mass productivity) of the housing 14 can be improved.

  In addition, since glyoxal is fixed to the wooden sheet 22 in advance during the manufacturing process of the housing 14, moisture absorption of the wooden sheet 22 can be suppressed by the glyoxal even after the electronic device 10 is commercialized (after shipment). Thereby, the curvature and deformation | transformation accompanying moisture absorption and drying of the wooden sheet 22 can be suppressed.

  Moreover, since the material impregnated in the wooden sheet 22 is glyoxal, it is possible to suppress the appearance of gloss on the surface of the wooden sheet 22. Thereby, the texture of the wooden sheet 22 can also be ensured.

  Moreover, since the wooden sheet 22 is impregnated with 10 to 150 wt% of glyoxal, moisture absorption of the wooden sheet 22 can be effectively suppressed. In addition, the effect which suppresses the moisture absorption of the wooden sheet 22 will become inadequate that the amount of impregnations of a glyoxal is less than 10 wt%. The maximum allowable value of the amount of glyoxal impregnation is 150 wt%.

[Second Embodiment]
Next, a second embodiment of the technology disclosed in the present application will be described.

  In the second embodiment shown in FIG. 3, instead of the above-described casing 14 (see FIG. 2), the casing 54 is manufactured in the following manner.

  That is, first, as shown in Step A of FIG. 3, the wooden sheet 22 is impregnated with the medicine 20 containing glyoxal (impregnation step). Further, as shown in step B of FIG. 3, the wooden sheet 22 is dried using, for example, a drying device 26, and the glyoxal is fixed to the wooden sheet 22 (drying step). The impregnation step and the drying step are the same as those in the first embodiment described above. However, in the impregnation process and the drying process of the second embodiment, two wooden sheets 22 are produced for one casing 54.

  Then, as shown in steps C and D in FIG. 3, the plurality of wooden sheets 22 are subjected to a molding process involving a bending process (molding process). In the present embodiment, hot press molding is performed as an example of the molding process.

  A mold 60 is used for this hot press molding. The mold 60 has a lower mold 62 and an upper mold 64. The lower mold 62 is formed with a convex portion 66 corresponding to the concave shape of the housing 54, and the upper mold 64 is formed with a concave portion 68 corresponding to the concave shape of the housing 54.

  Then, as shown in Step C of FIG. 3, the plurality of wooden sheets 22 to which the glyoxal is fixed as described above are set in the mold 60 in a state where they are stacked. At this time, the adhesive 70 is applied to the overlapping surface of the plurality of wooden sheets 22, and the plurality of wooden sheets 22 are temporarily stretched by the adhesive 70.

  The wooden sheet 22 on the lower mold 62 side forms a core layer of the casing 54, and the wooden sheet 22 on the upper mold 64 side forms a decorative layer of the casing 54. In FIG. 3, each of the pair of wooden sheets 22 is shown as a single layer, but more preferably, the core layer wooden sheet 22 has a plurality of layers (for example, four layers). Is a single layer (one layer). It is preferable that the plurality of wooden sheets 22 forming the core layer are overlapped so that the grain intersects in order to ensure strength.

  Next, as shown in step D of FIG. 3, the plurality of wooden sheets 22 are hot press-molded (laminated press molding) by the mold 60. In this manner, the plurality of wooden sheets 22 are bent by performing hot press molding in the mold 60.

  By the above procedure, a casing 54 having a plurality of wooden sheets 22 that are impregnated and fixed with glyoxal and integrated by hot press molding is formed. The number of wooden sheets 22 forming the housing 54 can be arbitrarily set.

  Next, the operation and effect of the second embodiment will be described.

  As described in detail above, according to the second embodiment, when the casing 54 is manufactured, the plurality of wooden sheets 22 are impregnated with glyoxal and fixed. Therefore, the strength of the plurality of wooden sheets 22 is improved by the glyoxal. As a result, even when hot press molding is performed on the plurality of wooden sheets 22, cracks occur in the plurality of wooden sheets 22, or cracks are formed in the three-dimensional bent shape portions such as the curved portions and the drawn portions in the plurality of wooden sheets 22. Occurrence of wrinkles and the like can be suppressed. As a result, the yield (mass productivity) of the housing 54 can be improved.

  In addition, since the glyoxal is fixed to the plurality of wooden sheets 22 in advance during the manufacturing process of the casing 54, the moisture absorption of the plurality of wooden sheets 22 is suppressed by the glyoxal even after the electronic device is commercialized (after shipment). Can do. Thereby, the curvature and deformation | transformation accompanying moisture absorption and drying of the some wooden sheet 22 can be suppressed.

  Moreover, since the material impregnated into the plurality of wooden sheets 22 is made of glyoxal, it is possible to suppress the appearance of gloss on the surface of the wooden sheet 22 of the decorative layer. Thereby, the texture of the wood of the wooden sheet 22 forming the decorative layer can be secured.

  Further, since the plurality of wooden sheets 22 are impregnated with 10 to 150 wt% of glyoxal, moisture absorption of the plurality of wooden sheets 22 can be effectively suppressed.

  In the second embodiment, the plurality of wooden sheets 22 are integrated by hot press molding using the mold 60. However, the plurality of wooden sheets 22 may be integrated by hot steam press molding using the mold 60.

  As described above, even when the steam press forming is performed on the plurality of wooden sheets 22, since the glyoxal is fixed to the plurality of wooden sheets 22, the expansion and contraction associated with moisture absorption and drying of the plurality of wooden sheets 22 is suppressed. be able to. Thereby, since it is possible to suppress improper fixing due to misalignment or warping of the plurality of wooden sheets 22 during molding, the yield (mass productivity) of the housing 54 can be improved.

  Also in the second embodiment, the housing 54 may be used for, for example, a notebook personal computer or other types of electronic devices in addition to the mobile terminal such as a mobile phone or a smartphone.

  Next, examples will be described.

[Comparative Example 1]
A comparative example will be described before an example described later is described. In Comparative Example 1, a wooden sheet (thickness: 100 μm) was set in a mold and injection molded. In this injection molding, a wooden sheet is heated with steam and then set in a mold. The resin used is polycarbonate (PC), the resin temperature is 320 ° C., the mold temperature is 80 ° C., and the injection pressure is 1000 kgf / cm ² . Molded with As a result, the resin was filled along the grain of the wooden sheet, and the resin was exposed on the surface of the grain, resulting in a defect (the texture of the tree disappeared).

[Example 1]
On the other hand, in Example 1, as an example of the above-described first embodiment, a wooden sheet (thickness: 100 μm) was impregnated with a chemical containing glyoxal and dried to produce a wooden sheet for a decorative layer. The conditions were such that the concentration of glyoxal in the drug was 30%, the impregnation time was 1 hour under vacuum conditions, the drying was at 40 ° C. for 24 hours, and the impregnation amount was 80 wt%. The wooden sheet was set in a mold and injection molded. In this injection molding, a wooden sheet is heated with steam and then set in a mold. The resin used is polycarbonate (PC), the resin temperature is 320 ° C., the mold temperature is 80 ° C., and the injection pressure is 1000 kgf / cm ² . Molded with As a result, the wooden texture of the wooden sheet was ensured without deformation of the wooden sheet.

[Example 2]
In Example 2, as an example of the above-described second embodiment, a wooden sheet (thickness: 100 μm) was impregnated with a drug containing glyoxal and dried to prepare a wooden sheet for a decorative layer and a core layer. The conditions were such that the concentration of glyoxal in the drug was 30%, the impregnation time was 1 hour under vacuum conditions, the drying was at 40 ° C. for 24 hours, and the impregnation amount was 80 wt%. The wooden sheet was set in a mold and hot press molded. In this hot press molding, the decorative layer wooden sheet was one layer, and the core layer wooden sheet was four layers. The core layer wooden sheets used knots and were laminated so that the wood grain was alternated. A thermosetting adhesive was applied to the plurality of wooden sheets with a squeegee on the overlapping surface when they were laminated. Then, a plurality of wooden sheets were superposed, exposed to steam for about 30 seconds, set in a mold and pressurized. The conditions of the hot press molding at this time are a curved shape in which the press shape is 30 × length 45 × thickness 3 cm, the end shape of the corner and depth is R30 mm, the temperature of the upper mold product surface is 130 ° C., The temperature of the back surface of the lower mold was 140 ° C., the molding pressure was 9 MPa, and the pressing time was 5 minutes. As a result, the yield was 96% (48 out of 50 sheets were non-defective), and the wood texture of the wooden sheet was secured.

  As mentioned above, although one embodiment of the technique disclosed in the present application has been described, the technique disclosed in the present application is not limited to the above, and various modifications may be made without departing from the spirit of the present invention. Of course, it is possible.

  In addition, the following additional remarks are disclosed regarding the one aspect | mode of the technique which the above-mentioned this application discloses.

(Appendix 1)
An impregnation step of impregnating a wooden sheet with glyoxal;
A molding step of obtaining a casing by performing a molding process on the wooden sheet to which the glyoxal is fixed;
Manufacturing method of the housing | casing provided with.
(Appendix 2)
A drying step of drying the wooden sheet after the impregnation step and before the molding step;
A method for manufacturing the housing according to Appendix 1.
(Appendix 3)
The molding process involves bending the wooden sheet,
The manufacturing method of the housing | casing of Additional remark 1 or Additional remark 2.
(Appendix 4)
In the impregnation step, the glyoxal is impregnated into the wooden sheet under vacuum or pressure.
The manufacturing method of the housing | casing as described in any one of attachment 1 to attachment 3.
(Appendix 5)
In the impregnation step, the wood sheet is impregnated with 10 to 150 wt% of the glyoxal.
The manufacturing method of the housing | casing as described in any one of appendix 1 to appendix 4.
(Appendix 6)
As the molding process, the wooden sheet is inserted into a mold and injection molded.
The manufacturing method of a housing according to any one of appendix 1 to appendix 5.
(Appendix 7)
By injection molding in the mold, bending of the wooden sheet and integral molding of the wooden sheet and resin,
The method for manufacturing the housing according to attachment 6.
(Appendix 8)
In the molding step, forming the casing with the wooden sheet as a decorative layer,
The method for manufacturing the housing according to appendix 6 or appendix 7.
(Appendix 9)
In the impregnation step, a plurality of the wooden sheets are impregnated with the glyoxal,
In the molding step, the plurality of wooden sheets are set in a mold in a stacked state, and the plurality of wooden sheets are hot press molded by the mold.
The manufacturing method of a housing according to any one of appendix 1 to appendix 5.
(Appendix 10)
In the impregnation step, a plurality of the wooden sheets are impregnated with the glyoxal,
In the molding step, the plurality of wooden sheets are stacked and set in a mold, and the plurality of wooden sheets are subjected to hot steam press molding by the mold.
The manufacturing method of a housing according to any one of appendix 1 to appendix 5.
(Appendix 11)
In the molding step, the plurality of wooden sheets are temporarily stretched with an adhesive and stacked.
A method for manufacturing the housing according to Supplementary Note 9 or Supplementary Note 10.
(Appendix 12)
In the molding step, the casing is formed using any one of the plurality of wooden sheets as a decorative layer and the remaining wooden sheet as a core layer.
The manufacturing method of a housing according to any one of appendix 9 to appendix 11.
(Appendix 13)
A housing having a wooden sheet impregnated with glyoxal and fixed and molded.
(Appendix 14)
The wooden sheet is bent by the molding process,
The housing according to attachment 13.
(Appendix 15)
The wooden sheet is impregnated with 10 to 150 wt% of the glyoxal.
The housing according to Supplementary Note 13 or Supplementary Note 14.
(Appendix 16)
With resin integrally molded on the wooden sheet by injection molding as the molding process,
The housing according to any one of appendix 13 to appendix 15.
(Appendix 17)
The wooden sheet forms a decorative layer,
The housing according to appendix 16.
(Appendix 18)
A plurality of the wooden sheets,
The plurality of wooden sheets are integrated by hot press molding as the molding process,
The housing according to any one of appendix 13 to appendix 15.
(Appendix 19)
A plurality of the wooden sheets,
The plurality of wooden sheets are integrated by hot steam press molding as the molding process,
The housing according to any one of appendix 13 to appendix 15.
(Appendix 20)
Any one of the plurality of wooden sheets is a decorative layer and the remaining wooden sheet is a core layer.
The casing according to appendix 18 or appendix 19.
(Appendix 21)
A housing having a wooden sheet impregnated with glyoxal and fixed and molded;
An internal unit housed in the housing;
With electronic equipment.
(Appendix 22)
The housing is the housing according to any one of appendix 13 to appendix 20.
The electronic device according to appendix 21.

10 Electronic Device 14 Housing 16 Internal Unit 22 Wooden Sheet 30 Mold 32 Core 34 Cavity 42 Resin 54 Housing 60 Mold 62 Lower Mold 64 Upper Mold 70 Adhesive

Claims (1)

An impregnation step of impregnating a plurality of wooden sheets with glyoxal;
The plurality of wooden sheets to which the glyoxal is fixed are set in a stacked state, and the plurality of wooden sheets are bonded together by hot press molding or hot steam press molding of the plurality of wooden sheets with the mold. A molding step of bending and obtaining a casing having a core layer and a decorative layer formed by the plurality of wooden sheets;
Manufacturing method of the housing | casing provided with .

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