JPH059247B2 - - Google Patents
Info
- Publication number
- JPH059247B2 JPH059247B2 JP63275165A JP27516588A JPH059247B2 JP H059247 B2 JPH059247 B2 JP H059247B2 JP 63275165 A JP63275165 A JP 63275165A JP 27516588 A JP27516588 A JP 27516588A JP H059247 B2 JPH059247 B2 JP H059247B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- push button
- button panel
- resin
- thermoplastic elastomer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 229920005989 resin Polymers 0.000 claims description 49
- 239000011347 resin Substances 0.000 claims description 49
- 229920002725 thermoplastic elastomer Polymers 0.000 claims description 39
- 238000000034 method Methods 0.000 claims description 22
- 238000002347 injection Methods 0.000 claims description 18
- 239000007924 injection Substances 0.000 claims description 18
- 238000004519 manufacturing process Methods 0.000 claims description 14
- 239000012790 adhesive layer Substances 0.000 claims description 9
- -1 polypropylene Polymers 0.000 claims description 6
- 239000004925 Acrylic resin Substances 0.000 claims description 4
- 229920000178 Acrylic resin Polymers 0.000 claims description 4
- 238000007650 screen-printing Methods 0.000 claims description 4
- 229920000728 polyester Polymers 0.000 claims description 3
- 229920001225 polyester resin Polymers 0.000 claims description 3
- 239000004645 polyester resin Substances 0.000 claims description 3
- 229920005749 polyurethane resin Polymers 0.000 claims description 3
- 239000004952 Polyamide Substances 0.000 claims description 2
- 239000004743 Polypropylene Substances 0.000 claims description 2
- 239000011230 binding agent Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 229920002647 polyamide Polymers 0.000 claims description 2
- 229920000098 polyolefin Polymers 0.000 claims description 2
- 229920001155 polypropylene Polymers 0.000 claims description 2
- 229920002635 polyurethane Polymers 0.000 claims description 2
- 239000004814 polyurethane Substances 0.000 claims description 2
- 239000004793 Polystyrene Substances 0.000 claims 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims 1
- 229920002223 polystyrene Polymers 0.000 claims 1
- 239000004800 polyvinyl chloride Substances 0.000 claims 1
- 229920000915 polyvinyl chloride Polymers 0.000 claims 1
- 238000001746 injection moulding Methods 0.000 description 8
- 239000010410 layer Substances 0.000 description 8
- 238000000465 moulding Methods 0.000 description 6
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 229920001971 elastomer Polymers 0.000 description 4
- 238000007646 gravure printing Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 239000000806 elastomer Substances 0.000 description 3
- 239000004640 Melamine resin Substances 0.000 description 2
- 229920000877 Melamine resin Polymers 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000002985 plastic film Substances 0.000 description 2
- 229920006267 polyester film Polymers 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 229920002379 silicone rubber Polymers 0.000 description 2
- 239000004945 silicone rubber Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 229920006346 thermoplastic polyester elastomer Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 229920006311 Urethane elastomer Polymers 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 150000001722 carbon compounds Chemical class 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229920006284 nylon film Polymers 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 238000007649 pad printing Methods 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 238000001721 transfer moulding Methods 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14827—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles using a transfer foil detachable from the insert
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/46—Knobs or handles, push-buttons, grips
- B29L2031/466—Keypads, keytops
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2215/00—Tactile feedback
- H01H2215/004—Collapsible dome or bubble
- H01H2215/008—Part of substrate or membrane
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2229/00—Manufacturing
- H01H2229/044—Injection moulding
- H01H2229/047—Preformed layer in mould
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Decoration By Transfer Pictures (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Input From Keyboards Or The Like (AREA)
- Manufacture Of Switches (AREA)
Description
ãã®çºæã¯ãè€æ°åã®æŒããã¿ã³ãé£ç¶ããŠåœ¢
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補é ããæ¹æ³ã«é¢ããã
This invention provides a push button panel made of an elastic body in which a plurality of push buttons are formed in series, and in which a base is formed by an injection molding method and contacts are formed by a transfer method at the same time. Relating to a method of manufacturing.
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A push button panel is a panel with a large number of push button parts 2.
1 is integrally formed on the base part 23 via the skirt part 22, and a contact point 24 is formed on the back surface of the push button part 21, so that the entire push button part 21 has flexibility (see FIG. 3). The push button panel becomes the movable contact of the switch, and is combined with a separately prepared fixed contact to form the push button. Such push-button panels are used in push-button switches for calculators, remote controls, telephones, and the like. The method for manufacturing push button panels is to place vulcanized silicone conductive rubber in a mold with a cavity in the shape of the push button section, then place unvulcanized colored silicone rubber on top of it to form letters, color-coded patterns, etc. A large number of push button parts, a skirt part, a base part, and a contact point are integrally formed by heating and pressurizing them by press molding or transfer molding. As mentioned above, this method is a time-consuming method with many steps. Recently, there has been a method of using injection molded thermoplastic elastomer resin to omit the vulcanization step, shorten the molding cycle, and reduce costs. In other words, this is a method in which the base of the push button panel is formed by injection molding, and then the contacts are formed on the back surface of the push button portion of the base. Contacts can be formed by printing methods such as screen printing or pad printing, by applying conductive ink by brush painting, and then heating and drying it, or by forming a contact pattern on a plastic sheet. There is a method of preparing a transfer sheet and transferring this contact pattern. However, even in these methods, the steps of forming contacts and display patterns still remain. Furthermore, since thermoplastic elastomer resin has poorer heat resistance than silicone rubber, the skirt portion may become deformed due to the heat applied when drying the surface letters and contact area printing. Therefore, as a method for easily forming contacts in large quantities, a transfer sheet with a contact pattern formed thereon is fixed in an injection mold, and the contacts are formed at the same time as the push button panel is formed by injection molding. It was investigated.
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Typically, when a pushbutton panel is formed by injection molding, a mold gate is placed on the back side of each pushbutton section. The push button panel has push button section 2.
A skirt portion 22 is formed in order to provide restoring force and a click feeling to 1 (see FIG. 3). Since the skirt portion 22 is thin, the push button portion 2
Unless gates are provided on the back surfaces of each of the molded parts, the thermoplastic elastomer resin will not reach every corner of the molded product. However, in the method of forming the contacts 24 using a transfer sheet at the same time as forming the push button sheet, the transfer sheet is located in the mold at a location on the back surface of the push button section 21 where the contacts 24 are to be formed. Therefore, in order to form the contact point 24 using a transfer sheet, the gate for injecting the thermoplastic elastomer resin cannot be brought to the back surface of the push button section 21, and the gate must be moved. Moreover, it is necessary to ensure that the thin skirt portion 22 is evenly filled with the resin.
However, if a gate is provided on the side of the base portion 23, the thermoplastic elastomer resin will not reach every corner, and if a gate is provided on the top surface of the push button portion 21, traces of the gate will remain on the surface of the push button portion 21. The object of the present invention is to eliminate such drawbacks and provide a method for manufacturing a push button panel in which the base can be formed by injection molding and the contacts can be formed by transfer method at the same time. shall be.
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In order to achieve the above-mentioned object, this invention
A transfer sheet on which a contact pattern and/or a display pattern are formed on a releasable base sheet is aligned and fixed in an injection mold, and then the mold is placed in a mold with a skirt portion having a thickness of 0.3 to 1.5 mm. After touching the mold, the thermoplastic elastomer resin is injected into the cavity of the mold, and then the mold is clamped until the skirt part has a thickness of 0.1 to 0.5 mm, and the thermoplastic elastomer resin is cooled and solidified. The mold was opened after waiting, the molded product was taken out from the mold, and the base sheet was peeled off. The present invention will be explained in more detail with reference to the drawings. 1 and 2 are cross-sectional views showing the manufacturing process of the push button panel of the present invention. 1 and 11 are transfer sheets, 2 and 12 are base sheets, 3 is a contact pattern, 4 is a mold, 5 is a fixed mold, 6 is a movable mold, 7 is a cavity, 8 is a thermoplastic elastomer resin, 1
3 indicates display patterns, respectively. First, a transfer sheet 1 on which a contact pattern 3 is formed is prepared. The transfer sheet 1 includes a base sheet 2 having removability.
A contact pattern 3 is formed on the top. As the base sheet 2, a heat-resistant plastic film is used. For example, polyester film, polyethylene film, polypropylene film, nylon film, etc. can be used, and polyester film, which has excellent properties such as heat resistance, moldability, and dimensional stability, is particularly suitable. The base sheet 2 may be subjected to mold release treatment by coating with a melamine resin or the like. For the contact pattern 3, a conductive ink made of a carbon compound such as carbon or graphite, or a conductive ink made of a metal such as silver, copper, nickel, or aluminum is used, and it can be printed by means such as screen printing or gravure printing. to form. Further, an adhesive layer may be formed on the contact pattern 3 if necessary. The adhesive layer is a layer for firmly adhering the contact pattern 3 and the molded product. As the adhesive layer, an adhesive having good adhesion to both the conductive ink and the thermoplastic elastomer resin 8, such as a polyurethane adhesive, a polyester adhesive, a polyolefin adhesive, etc., may be appropriately selected and used. Using the transfer sheet 1 having such a configuration, a push button panel is manufactured using an injection molding method. First, the push button part of the injection mold 4 for molding the push button panel and the contact pattern 3 of the transfer sheet 1 are aligned, and the transfer sheet 1 is placed in the mold 4.
Fixed to. At this time, the transfer sheet 1 is fixed in such a direction that the contact pattern 3 and the thermoplastic elastomer resin 8, which will be described later, are in contact with each other. Next, the mold 4 is brought into a mold-touch state (see FIG. 1a). Mold touching refers to a state in which the mold 4 is closed to form the cavity 7, the thermoplastic elastomer resin 8 can be filled therein, and the mold clamping force is 0 kg/cm 2 . At this point, it is important that the wall thickness of the skirt portion 22 is between 0.3 and 1.5 mm. Since the skirt portion 22 is thicker than the wall thickness of the final molded product, resin flows well within the cavity 7. Subsequently, thermoplastic elastomer resin 8 is injected into cavity 7 of mold 4. Thermoplastic elastomer resin 8 has an elongation of 100 to 1400% and a hardness of 30.
~99 (JIS A), preferably elongation 300-700%, hardness
35 to 95 (JIS A), a high elastic recovery rate, and excellent oil resistance and chemical resistance. For example, thermoplastic elastomer resins such as polyamide elastomer, polyester elastomer, urethane elastomer, and olefin elastomer can be used. In addition, the temperature of the mold 4 and thermoplastic elastomer resin 8 in this process varies depending on the type of resin and the shape of the molded product, but the mold temperature should be approximately 20 to 60°C, and the resin temperature should be in the range of 160 to 230°C. . Next, the mold 4 is clamped (see FIG. 1b).
This step is the most important point in this invention.
By clamping the mold immediately after the thermoplastic elastomer resin 8 is injected into the cavity 7, the thermoplastic elastomer resin 8 is compressed and forced into the cavity 7 of the mold 4. At this time, the tip of the injection nozzle for the thermoplastic elastomer resin 8 is closed (not shown). Further, it is preferable that the side gate portion is also closed by moving the cavity 7. The compression stroke of the mold 4 is preferably 0.2 to 1.0 mm. In the push button panel, the wall thickness of the base part 24 is thick in order to attach it to the housing, and the wall thickness of the skirt part 22 needs to be thin in order to provide resilience and clickability. If the compression stroke is large and the compression stroke is less than 0.2 mm, the thin skirt portion 22 may be insufficiently filled, or welds may occur, resulting in insufficient keying strength. Furthermore, if the compression stroke exceeds 1.0 mm, the resin will solidify during compression and cannot be compressed sufficiently, causing distortion in the molded product. In this way, the skirt portion 22
The wall thickness is 0.1 to 0.5 mm. The mold clamping force varies depending on the type of thermoplastic elastomer resin 8 and the shape of the molded product. Furthermore, the mold clamping force can be applied in two or more stages, such that the mold clamping force is initially weak and then becomes stronger. Next, after waiting for the thermoplastic elastomer resin 8 to cool and solidify, the mold 4 is opened, the molded product is taken out, and the base sheet 2 is peeled off to complete the push button panel. Further, when forming a display pattern on the top surface of the push button section 21, it is preferable to do as follows. First, a transfer sheet 11 for display patterns is separately prepared. The transfer sheet 11 has a release layer formed on a base sheet 12, a display pattern 13 formed thereon, and an adhesive layer further formed thereon. As the base sheet 12, it is preferable to use the same base sheet 2 used for the transfer sheet 1 for contact patterns. Further, since the release layer serves as a layer for protecting the display pattern formed on the top surface of the push button section 21, it is preferably formed of a material having wear resistance and human oil resistance. In particular, ultraviolet or electron beam-curable acrylic resins are suitable. The display pattern 13 is formed into a pattern expressing characters, numbers, symbols, etc., and color coding indicating functions. As the adhesive layer, it is preferable to use the same adhesive layer as used in the transfer sheet for contact patterns. Moreover, as the mold 4, when the height of the push button portion 21 is low, the mold 4 described above can be used as is. If the height of the push button section 21 is high, the display transfer sheet 11 will not fit tightly into the cavity of the fixed mold 5 and may wrinkle or tear. Prepare a split mold that is configured to be divided. Two types of transfer sheets are fixed to the mold 4 having such a structure. The contact pattern transfer sheet 1 is aligned with the movable mold 6 side of the mold 4 and fixed.
At this time, the transfer sheet 1 is fixed in such a direction that the contact pattern 3 and the thermoplastic elastomer resin 8 are in contact with each other. Further, the display pattern transfer sheet 11 is aligned and fixed on the fixed mold 5 side. At this time, the transfer sheet 11 is fixed in such a direction that the display pattern 13 and the thermoplastic elastomer resin 8 are in contact with each other. When the fixed mold 5 is a split mold, it is aligned and fixed between the fixed molds 5. The transfer sheet 11 is fixed by closing the split mold. Furthermore, holes for the resin to pass through are previously formed in the transfer sheet 11 at portions corresponding to the sprue runner portions of the fixed mold 5. In order to form holes in the transfer sheet 11, it is preferable to punch holes at predetermined positions using a hole punching mechanism before the transfer sheet 11 enters the molding process. Alternatively, a blade may be formed in the sprue runner portion of the fixed mold 5 so that the sprue runner is perforated at the same time as the transfer sheet 11 is fixed. Next, the mold 4 is brought into the mold touch state (the second
(see FIG. 2b), and a pushbutton panel is formed in the same manner as described above (see FIG. 2b). In this way, a push button panel with a display pattern formed on the top surface of the push button section is completed.
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First, the pattern of the push button part of the injection mold 4 for molding the push button panel of the transfer sheet 1 and the contact pattern 3 are aligned, and the transfer sheet 1 is fixed in the mold 4. Next, the mold 4 is closed and the mold is in a closed state. At this time, the mold clamping force was 0 kg/cm 2 . Subsequently, thermoplastic elastomer resin 8 is injected into cavity 7 of mold 4 . The thermoplastic elastomer resin 8 fills the cavity 7 of the mold 4.
Comparing the mold clamping force and the resin injection pressure, the injection pressure is greater, so the molded product becomes thicker than the initial shape of the cavity. Furthermore, the thermoplastic elastomer resin 8 is spread throughout the cavity. Further, the transfer sheet 1 is pressed by the thermoplastic elastomer resin 8 within the cavity 7 and comes into close contact with the inner wall of the cavity 7 . The surface of the contact pattern 3 formed on the transfer sheet 1 is melted by the heat of the thermoplastic elastomer resin 8 and the mold 4, and is integrated with the injected thermoplastic elastomer resin 8. The mold 4 is then immediately tightened. Here, pressure is applied to the molded product, and the molded product is formed to the desired thickness. After cooling and solidifying the thermoplastic elastomer resin 8, the mold 4 is opened and the transfer sheet 1 is taken out together with the molded product. Next, when the base sheet 2 is peeled off from the back side of the molded product, the base sheet 2 is peeled off at the interface between the base sheet 2 and the contact pattern 3, and the contacts 24 are formed on the back side of the push button part 21, thereby completing a push button panel.
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Example 1 A polyethylene terephthalate film having a thickness of 38 ÎŒm was used as a base sheet, and a release layer made of melamine resin was formed thereon by a gravure printing method, and a release treatment was performed. Next, using thermoplastic carbon ink containing a binder made of urethane resin,
A contact pattern was formed by screen printing, and an adhesive layer made of polyurethane resin was printed in the same pattern on top of the contact pattern to produce a transfer sheet. This transfer sheet is aligned and fixed in the injection mold, and the mold is closed to a 1.0 mm open position from the mold clamp state to the mold touch state, and then the mold is closed. A heated and melted thermoplastic polyester elastomer resin was injected into the mold cavity under the following conditions. Injection conditions (Japan Steel Works injection molding machine: JT70-40V used) - Mold temperature 35â - Cylinder temperature NH: 195â H2: 195â H: 180â - Injection pressure 600Kg/cm 2 - Injection speed 99% , the mold is clamped at 800Kg/ cm2 , and after the thermoplastic elastomer resin has cooled and solidified, the mold is opened.
The base sheet was peeled off and the molded base was taken out. A pushbutton panel was thus obtained. The thickness of the skirt part of this push button panel is 0.2mm.
There was no deformation or crack, and the load was 500.
It passed the operating life test of 200,000 times at a keystroke speed of 2 g/sec. Example 2 The transfer sheet used in Example 1 was used as a contact pattern transfer sheet. Further, a polyethylene terephthalate film with a thickness of 38 ÎŒm was used as a base sheet, and a release layer made of an epoxy resin was formed thereon, and a release layer made of an ultraviolet curable acrylic resin was formed thereon by a gravure printing method. Next, a display pattern made of thermoplastic acrylic resin and an adhesive layer made of polyester resin are formed on top of the display pattern using gravure printing.Finally, the release layer is cured by irradiation with ultraviolet rays, and the display pattern transfer is completed. A sheet was produced. These transfer sheets are aligned and fixed in the injection mold, which is a split mold in which the fixed mold is divided at the top surface of the push button part of the cavity, and then the mold is clamped. from the state of
The mold was closed to the open position of the 1.0 mm mold to bring the mold into a touch state, and then heated and melted thermoplastic polyester elastomer resin was injected into the cavity of the molding mold under the following conditions. Injection conditions (Japan Steel Works injection molding machine: JT70-40V used) - Mold temperature 40â - Cylinder temperature NH: 225â H2: 230â H: 200â - Injection pressure 580Kg/cm 2 - Injection speed 50% , the mold is clamped at 800Kg/ cm2 , and after the thermoplastic elastomer resin has cooled and solidified, the mold is opened.
The base sheet was peeled off and the molded base was taken out. A pushbutton panel was thus obtained. The height of the push button part was 10 mm, and the display pattern formed on the top surface was beautiful with no pattern changes or positional deviations.
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The method for manufacturing a push button panel of the present invention includes forming a contact pattern or/and
and the transfer sheet on which the display pattern is formed are aligned and fixed in the injection mold, the mold is brought into the mold touch state, and then the thermoplastic elastomer resin is injected into the cavity of the mold, Next, the mold is closed, the thermoplastic elastomer resin is cooled and solidified, and then the mold is opened and the molded product is taken out of the mold, so the thermoplastic elastomer resin is poured into every corner. It is possible to manufacture beautiful push button panels that are spread all over the place. Further, since it is not necessary to arrange a gate on the upper surface of the push button part, and the number of gates can be significantly reduced, the number of days and costs for manufacturing the mold can be significantly reduced.
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1 and 2 are cross-sectional views showing the manufacturing process of the push button panel of the present invention. FIG. 3 is a cross-sectional view of a conventional push button panel. 1, 11... Transfer sheet, 2, 12... Base sheet, 3... Contact pattern, 4... Mold, 5...
Fixed type, 6... Movable type, 7... Cavity, 8...
... thermoplastic elastomer resin, 13 ... display pattern, 21 ... push button section, 22 ... skirt section, 23 ... base section, 24 ... contact point.
Claims (1)
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æ±é ïŒèšèŒã®æŒããã¿ã³ããã«ã®è£œé æ¹æ³ã ïŒ éåïŒã®åºå®åãå²åã§ããããã€ããã€ïŒ
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æ³ã[Scope of Claims] 1. A transfer sheet 1 on which a contact pattern 3 and/or a display pattern 13 are formed on a removable base sheet 2 is aligned and fixed in an injection mold 4, and then molded with metal. The mold 4 is brought into a state in which the thickness of the skirt portion 22 is 0.3 to 1.5 mm, and then the thermoplastic elastomer resin 8 is injected into the cavity 7 of the mold 4, and then the mold 4 is brought into a state where the thickness of the skirt portion 22 is 0.3 to 1.5 mm. The mold is clamped until it becomes 0.1 to 0.5 mm, the mold 4 is opened after waiting for the thermoplastic elastomer resin 8 to cool and solidify, the molded product is taken out from the mold 4, and the base sheet 2 is peeled off. A method for manufacturing a push button panel. 2. The method of manufacturing a push button panel according to claim 1, wherein the flow path for the thermoplastic elastomer resin 8 into the cavity 7 is a side gate. 3. The method of manufacturing a push button panel according to claim 1, wherein the two transfer sheets are fixed in the mold 4 so as to be positioned on both sides of the push button panel. 4. The method for manufacturing a push button panel according to claim 1, wherein the thermoplastic elastomer resin 8 is one of polyester, polyamide, polyolefin, polystyrene, polyurethane, and polyvinyl chloride. 5 A contact pattern 3 made of carbon conductive ink with polyurethane resin or polyester resin as a binder is formed on the base sheet 2 of which the transfer sheet 1 has been subjected to mold release treatment by a screen printing method, and a polyurethane resin - The method for manufacturing a push button panel according to claim 1, wherein an adhesive layer made of one of polyester resin, polypropylene resin, and acrylic resin is formed. 6 The fixed mold of mold 4 is a split mold, and cavity 7
4. The method of manufacturing a push button panel according to claim 3, wherein the push button panel is divided at the top surface of the push button panel.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63275165A JPH02121815A (en) | 1988-10-31 | 1988-10-31 | Manufacture of push-button panel |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63275165A JPH02121815A (en) | 1988-10-31 | 1988-10-31 | Manufacture of push-button panel |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH02121815A JPH02121815A (en) | 1990-05-09 |
JPH059247B2 true JPH059247B2 (en) | 1993-02-04 |
Family
ID=17551580
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP63275165A Granted JPH02121815A (en) | 1988-10-31 | 1988-10-31 | Manufacture of push-button panel |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH02121815A (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2529609Y2 (en) * | 1990-08-31 | 1997-03-19 | æŸäžé»åšç£æ¥æ ªåŒäŒç€Ÿ | Mold for electronic parts |
KR100317076B1 (en) * | 1999-04-12 | 2001-12-22 | ì€ê·Œì | Pressurized molded material and the molding apparatus using pressure fluid through synthetic resin panel |
JP3090037U (en) | 2002-05-16 | 2002-11-22 | è¹äºé»æ©æ ªåŒäŒç€Ÿ | Operation buttons integrated front panel |
JP2011011523A (en) * | 2009-07-06 | 2011-01-20 | Sony Corp | Multicolor molding method, multicolor molding apparatus, and multicolor molded part |
-
1988
- 1988-10-31 JP JP63275165A patent/JPH02121815A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPH02121815A (en) | 1990-05-09 |
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