JPH0280212A - Plastic molding mold - Google Patents
Plastic molding moldInfo
- Publication number
- JPH0280212A JPH0280212A JP23206288A JP23206288A JPH0280212A JP H0280212 A JPH0280212 A JP H0280212A JP 23206288 A JP23206288 A JP 23206288A JP 23206288 A JP23206288 A JP 23206288A JP H0280212 A JPH0280212 A JP H0280212A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- molding mold
- elongation
- high polymer
- lens sheet
- 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.)
- Granted
Links
- 238000010137 moulding (plastic) Methods 0.000 title claims description 3
- 239000011347 resin Substances 0.000 claims abstract description 22
- 229920005989 resin Polymers 0.000 claims abstract description 22
- 239000004033 plastic Substances 0.000 claims abstract description 12
- 229920003023 plastic Polymers 0.000 claims abstract description 12
- 239000002904 solvent Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 abstract description 14
- 229920000642 polymer Polymers 0.000 abstract description 11
- 238000000465 moulding Methods 0.000 abstract description 10
- -1 polyethylene Polymers 0.000 abstract description 6
- 230000005865 ionizing radiation Effects 0.000 abstract description 5
- 230000003578 releasing effect Effects 0.000 abstract description 5
- 229920000306 polymethylpentene Polymers 0.000 abstract description 4
- 239000011116 polymethylpentene Substances 0.000 abstract description 4
- 239000004698 Polyethylene Substances 0.000 abstract description 3
- 229920000573 polyethylene Polymers 0.000 abstract description 3
- 239000004743 Polypropylene Substances 0.000 abstract description 2
- 150000001336 alkenes Chemical class 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 229920001155 polypropylene Polymers 0.000 abstract description 2
- 238000003847 radiation curing Methods 0.000 abstract description 2
- 125000001153 fluoro group Chemical group F* 0.000 abstract 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 abstract 1
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 238000003848 UV Light-Curing Methods 0.000 description 5
- 238000010894 electron beam technology Methods 0.000 description 5
- 238000001723 curing Methods 0.000 description 4
- 238000004049 embossing Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- UHESRSKEBRADOO-UHFFFAOYSA-N ethyl carbamate;prop-2-enoic acid Chemical compound OC(=O)C=C.CCOC(N)=O UHESRSKEBRADOO-UHFFFAOYSA-N 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 239000004699 Ultra-high molecular weight polyethylene Substances 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- KCTAWXVAICEBSD-UHFFFAOYSA-N prop-2-enoyloxy prop-2-eneperoxoate Chemical compound C=CC(=O)OOOC(=O)C=C KCTAWXVAICEBSD-UHFFFAOYSA-N 0.000 description 1
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 description 1
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
Description
【発明の詳細な説明】
(産業上の利用分野)
本発明は、電離放射線硬化樹脂を用いてレンズシートな
どを成形するのに適したプラスチック成形型に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a plastic mold suitable for molding a lens sheet or the like using an ionizing radiation-cured resin.
〔従来の技術]
リヤプロジェクションスクリーン等に使用されるプラス
チックレンズシートを成形するために、紫外線(UV)
や電子線(EB)等の電離放射線を照射して樹脂を硬化
させる電離放射線重合法が知られている。[Prior art] In order to mold plastic lens sheets used for rear projection screens, etc., ultraviolet (UV)
Ionizing radiation polymerization methods are known in which resins are cured by irradiating them with ionizing radiation such as electron beams (EB) or electron beams (EB).
まず、電離放射線重合法によるレンズシートの成形につ
いて簡単に説明する。First, molding of a lens sheet using the ionizing radiation polymerization method will be briefly explained.
第1図、第2図は、−船釣なレンズシートの成形工程と
それに使用される成形型、およびそれらの問題点を説明
するための図である。FIGS. 1 and 2 are diagrams for explaining the process of molding a lens sheet, the molds used therein, and the problems involved.
第1図において、1は成形型、2はUV硬化樹脂である
。In FIG. 1, 1 is a mold, and 2 is a UV curing resin.
成形型1は、天然ダイヤモンドで鏡面加工が可能な銅、
銅合金、アルミニウムまたはニッケルなどの金属に、エ
ンボス形状を施したものが使用されていた。この成形型
1には、エンボスの先端に微細な逆テーパ部1aが形成
されてしまう(第1図(a))。Mold 1 is made of copper that can be mirror-finished with natural diamonds.
Embossed shapes were used in metals such as copper alloys, aluminum, or nickel. In this mold 1, a minute reverse taper portion 1a is formed at the tip of the embossing (FIG. 1(a)).
この理由は、成形型1の切削性、バイト4の欠けなどを
考慮し、特に、成形型1の材料として、前述したような
銅系、アルミニウム系などの金属を用いた場合に、その
材料自体が柔らかいため、ハイド4で切り込む際、材料
がバイト4で押されて、エンボスの先端に力Fがかかり
形状変形が起こる(第2図)、この変形は、形状が細か
い成形型1の先端部で顕著に発生する。The reason for this is considering the machinability of the mold 1, the chipping of the cutting tool 4, etc., and especially when using metals such as copper or aluminum as mentioned above as the material of the mold 1, the material itself Because the material is soft, when cutting with the hide 4, the material is pushed by the cutting tool 4, and force F is applied to the tip of the embossing, causing shape deformation (Figure 2).This deformation occurs at the tip of the mold 1, which has a fine shape. It occurs noticeably in
この成形型1に、UV硬化樹脂2を塗布し、U■光源を
用いてそのUV硬化樹脂2を硬化したのち(第1図(b
)L離型することによりレンズシート3を得る(第1図
(C))。After coating the mold 1 with a UV curing resin 2 and curing the UV curing resin 2 using a U light source (Fig. 1 (b)
) A lens sheet 3 is obtained by releasing the mold (FIG. 1(C)).
上述した従来の金属製の成形型1では、離型に際して、
レンズシート3の先端部3aが折れて、エンボス内に残
り、成形型1を使用できなくなるという問題があった(
第1図(C))。In the conventional metal molding die 1 described above, upon demolding,
There was a problem in that the tip 3a of the lens sheet 3 broke and remained inside the embossing, making the mold 1 unusable (
Figure 1 (C)).
また、この成形型lが、金属製であると、金属表面で硬
化阻害が起こり、使用可能なUV硬化樹脂が限られてし
まう。Furthermore, if the mold 1 is made of metal, curing will be inhibited on the metal surface, and usable UV-curable resins will be limited.
さらに、成形型1の金属表面とUV硬化樹脂2の濡れ性
が悪く、硬化後に気泡が残り、外観的にも光学的にも好
ましくない。Furthermore, the wettability between the metal surface of the mold 1 and the UV-cured resin 2 is poor, and bubbles remain after curing, which is unfavorable both in appearance and optically.
さらにまた、UV硬化樹脂2が硬化時に収縮した場合に
、成形型1はその収縮に追従してたわむことがないので
、成形されたレンズシート3が成形型1に食い込んでし
まう。その結果、離型することが困難になり、レンズシ
ート3が部分的に白化する離型不良が発生する。Furthermore, when the UV cured resin 2 contracts during curing, the mold 1 does not bend to follow the contraction, so the molded lens sheet 3 bites into the mold 1. As a result, it becomes difficult to release the lens sheet 3 from the mold, resulting in defective mold release in which the lens sheet 3 partially becomes white.
一方、金属製の成形型1は、高価であり、レンズシート
3の製造コストを上昇させる要因となるという問題もあ
った。On the other hand, the metal mold 1 is expensive and has the problem of increasing the manufacturing cost of the lens sheet 3.
プラスチνり成形型も一部で提案されているが(特開昭
6l−114232)、単に可撓性があるというだけで
、前記各課題を解決できるものではなかった。Some plastic molding molds have been proposed (Japanese Unexamined Patent Publication No. 61-114232), but these molds cannot solve the above-mentioned problems simply because they are flexible.
本発明の目的は、使用できる電離放射線硬化樹脂が限定
されることなく、その電離放射線硬化樹脂との離型性、
脱泡性がよく、しかも、安価に製造できるプラスチック
成形型を提供することである。The purpose of the present invention is not to limit the usable ionizing radiation-cured resin, but also to improve its mold releasability with the ionizing radiation-cured resin.
To provide a plastic mold that has good defoaming properties and can be manufactured at low cost.
前記課題を解決するために、本発明によるプラスチック
成形型は、電離放射線硬化樹脂を用いて微細なエンボス
形状を有するシートを成形するプラスチック成形型にお
いて、溶解度パラメータが8.0以下で、破断点での伸
びが70%以上である耐溶剤性プラスチックに、エンボ
ス形状を施した構成としである。In order to solve the above problems, a plastic mold according to the present invention is a plastic mold for molding a sheet having a fine embossed shape using an ionizing radiation-cured resin, and has a solubility parameter of 8.0 or less and a The structure is made of a solvent-resistant plastic with an elongation of 70% or more and an embossed shape.
前記電離放射線硬化樹脂としては、UV硬化樹脂、EB
硬化樹脂等が使用でき、具体的には、ウレタンアクリレ
ート、エポキシアクリレート、ポリエステルアクリレー
ト脂肪族アクリレート芳香族アクリレート等の樹脂を使
用できる。これらの溶解度パラメータは、殆どのものが
δ=9.0〜10,0の範囲である。The ionizing radiation curing resin includes UV curing resin, EB
Cured resins and the like can be used, and specifically, resins such as urethane acrylate, epoxy acrylate, polyester acrylate, aliphatic acrylate, aromatic acrylate, etc. can be used. Most of these solubility parameters are in the range δ=9.0 to 10.0.
前記耐溶剤性プラスチックとしては、ポリメチルペンテ
ン、ポリエチレン、ポリプロピレン等のオレフィンまた
はフッソ系樹脂を使用することができる。As the solvent-resistant plastic, olefins such as polymethylpentene, polyethylene, polypropylene, or fluorine resins can be used.
溶解度パラメータ(Solubility Paran
+eter :δで表す)とは、−船釣には、ある高分
子の溶媒に対する溶解性や他の高分子に対する混ざりや
すさ、接着しやすさ、すなわち分子の結びつきの強さの
指標となる値をいう。Solubility Paran
+eter: expressed as δ) means - In boat fishing, it is a value that is an indicator of the solubility of a certain polymer in a solvent, the ease with which it mixes with other polymers, and the ease with which it adheres, that is, the strength of the bond between molecules. means.
この発明では、特に、成形型の材料として用いる高分子
と、レンズシートの材料として用いる高分子との剥離性
のよさの指標を示す値として使用している。In this invention, the value is particularly used as an index of the degree of releasability between the polymer used as the material for the mold and the polymer used as the material for the lens sheet.
具体的には、前述したようにレンズシートの材料となる
高分子の溶解度パラメータδは9.0〜10.0程度で
あるので、成形型の材料となる高分子として溶解度パラ
メータδが8.0以下のものを用いれば、離型性がよい
という結論を得た。Specifically, as mentioned above, the solubility parameter δ of the polymer used as the material of the lens sheet is about 9.0 to 10.0, so the solubility parameter δ of the polymer used as the material of the mold is 8.0. It was concluded that mold releasability is good if the following materials are used.
つぎに、プラスチックの破断点の伸びについて説明する
。高分子材料などに引張荷重を加えた場合に、分子間に
すべりが生じて、いわゆる流動という現象を起こし、高
分子は伸びていき、最後に破断する。このときに、元の
長さと伸びた長さとの比を、破断点の伸びという。Next, the elongation of plastic at the breaking point will be explained. When a tensile load is applied to a polymeric material, slippage occurs between the molecules, causing a phenomenon called flow, causing the polymer to stretch and eventually break. At this time, the ratio of the original length to the stretched length is called the elongation at the break point.
この発明では、柔軟性のある材料のほうが成形型から成
形したシートを離型する際に、そのシートの破損が起こ
りにくいので、この柔軟性を規定する指標として用いて
いる。In this invention, since a flexible material is less likely to cause damage to the sheet when it is released from a mold, this flexibility is used as an index to define the flexibility.
具体的には、成形型に施されたエンボスの先端部におけ
る電離放射線硬化樹脂の折れや、離型不良などを考慮し
て、破断点の伸びが70%以上であることが望ましいと
いう結論を得た。Specifically, we concluded that it is desirable for the elongation at the break point to be 70% or more, taking into account folding of the ionizing radiation-cured resin at the tip of the embossing on the mold, poor mold release, etc. Ta.
つぎに、実施例について、本発明の詳細な説明する。 Next, the present invention will be described in detail with reference to Examples.
次新l汁よ
N1m、横1mで厚さが2mmの銅板に、フレネルレン
ズ状のエンボスを切削加工し、これを母型として、ポリ
メチルペンテン(δζ7.5.破断点の伸び一85%)
を熱プレスして、ポリメチルペンテン成形型を作製した
。A Fresnel lens-shaped emboss was cut into a copper plate 1 m wide and 2 mm thick, and this was used as a matrix to make polymethylpentene (δζ 7.5. Elongation at break point - 85%).
was hot pressed to produce a polymethylpentene mold.
X1J1汁(
屋1m、横1mで厚さが5mmの超高分子ポリエチレン
(δ# 7.9 、破断点の伸び一90%)の板に、フ
レネルレンズ母型状のエンボスを切削加工し、超高分子
ポリエチレン成形型を作製した。An embossed Fresnel lens matrix was cut into a board of ultra-high molecular weight polyethylene (δ# 7.9, elongation at break -90%) that was 1 m wide and 1 m wide with a thickness of 5 mm. A polymer polyethylene mold was made.
前記各成形型を用いて、ウレタンアクリレート系のUV
硬化樹脂を塗布し、紫外線を照射して、硬化した。Using each of the above molds, urethane acrylate UV
A hardening resin was applied and cured by irradiation with ultraviolet light.
各成形型から成形されたレンズシートを離型するに際し
て、極めて離型性がよかった。また、レンズシートのエ
ンボスに折れはなく、気泡も含まれておらず、良好なレ
ンズシートが得られた。When releasing the molded lens sheet from each mold, the mold release properties were extremely good. Furthermore, the embossments on the lens sheet were not folded and did not contain air bubbles, and a good lens sheet was obtained.
〔発明の効果]
以上詳しく説明したように、本発明によれば、成形した
シートとの前型性、脱泡性がよい成形型を、安価に製造
できる、という効果がある。[Effects of the Invention] As described in detail above, the present invention has the effect that a mold that has good preformability and defoaming properties with respect to a molded sheet can be manufactured at a low cost.
第1図5第2図は、−船釣なレンズシートの成形工程と
それに使用される成形型、およびそれらの問題点を説明
するための図である。
1・・・成形型
2・・・UV硬化樹脂
3・・レンズシート
4・・・バイト
特許出願人 大日本印刷株式会社
代 理 人 弁理士 鎌1)次男
嘉
図
(Q)
第2図
(b)
(b)
(d)FIG. 1, FIG. 5, and FIG. 2 are diagrams for explaining the process of molding a lens sheet, the molds used therein, and the problems thereof. 1... Molding mold 2... UV curing resin 3... Lens sheet 4... Part-time job Patent applicant Dai Nippon Printing Co., Ltd. Agent Patent attorney Sickle 1) Second son Yoshizu (Q) Figure 2 (b) ) (b) (d)
Claims (1)
るシートを成形するプラスチック成形型において、溶解
度パラメータが8.0以下で、破断点での伸びが70%
以上である耐溶剤性プラスチックに、エンボス形状を施
したことを特徴とするプラスチック成形型。In plastic molds that mold sheets with fine embossed shapes using ionizing radiation-cured resin, the solubility parameter is 8.0 or less and the elongation at the break point is 70%.
A plastic molding die characterized by having an embossed shape formed on the above solvent-resistant plastic.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23206288A JP2834743B2 (en) | 1988-09-16 | 1988-09-16 | Plastic mold |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23206288A JP2834743B2 (en) | 1988-09-16 | 1988-09-16 | Plastic mold |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0280212A true JPH0280212A (en) | 1990-03-20 |
JP2834743B2 JP2834743B2 (en) | 1998-12-14 |
Family
ID=16933382
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP23206288A Expired - Fee Related JP2834743B2 (en) | 1988-09-16 | 1988-09-16 | Plastic mold |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2834743B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5398389A (en) * | 1993-04-13 | 1995-03-21 | Yoshida Kogyo K.K. | Swivel hook |
JP2009002389A (en) * | 2007-06-19 | 2009-01-08 | Maazen Products:Kk | Hook |
-
1988
- 1988-09-16 JP JP23206288A patent/JP2834743B2/en not_active Expired - Fee Related
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5398389A (en) * | 1993-04-13 | 1995-03-21 | Yoshida Kogyo K.K. | Swivel hook |
JP2009002389A (en) * | 2007-06-19 | 2009-01-08 | Maazen Products:Kk | Hook |
Also Published As
Publication number | Publication date |
---|---|
JP2834743B2 (en) | 1998-12-14 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |