JPH0671763B2 - Thermoforming method for polycarbonate resin sheet - Google Patents
Thermoforming method for polycarbonate resin sheetInfo
- Publication number
- JPH0671763B2 JPH0671763B2 JP2754091A JP2754091A JPH0671763B2 JP H0671763 B2 JPH0671763 B2 JP H0671763B2 JP 2754091 A JP2754091 A JP 2754091A JP 2754091 A JP2754091 A JP 2754091A JP H0671763 B2 JPH0671763 B2 JP H0671763B2
- Authority
- JP
- Japan
- Prior art keywords
- resin sheet
- molding
- polycarbonate resin
- temperature
- molding die
- 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
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、ポリカーボネート樹
脂シートを成形用材料として、これに熱成形を施すこと
により透明性に優れた成形品を得るための熱成形方法に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermoforming method for obtaining a molded article excellent in transparency by thermoforming a polycarbonate resin sheet as a molding material.
【０００２】[0002]
【従来の技術】一般に、熱可塑性樹脂シートの熱成形方
法の１つとして良く知られる真空成形法は、例えば塩化
ビニル（ＰＶＣ）樹脂シート、アクリロニトリル・ブタ
ジエン・スチレン（ＡＢＳ）樹脂シート、ポリメチル・
メタクリレート（ＰＭＭＡ）樹脂シート等による成形製
品の製造に広く用いられている。2. Description of the Related Art Generally, a vacuum forming method well known as one of thermoforming methods for thermoplastic resin sheets is, for example, vinyl chloride (PVC) resin sheet, acrylonitrile butadiene styrene (ABS) resin sheet, polymethyl
It is widely used for manufacturing molded products such as methacrylate (PMMA) resin sheets.
【０００３】従来、かかる樹脂シートの真空成形は、一
般的に次のようにして行われている。即ち、先ず第３図
Ａに示すように、成形機における下テーブル（２１）上
に所要の成形型（２０）を、その成形面（２０ａ）を上
向きの状態にして配設し、該成形型の上方において周縁
をクランパー（２２）で把持した樹脂シート（Ｓ）を図
示しないヒーターで所定温度に加熱軟化せしめたのち、
これを同図Ｂに示すように予め所定温度に調温した成形
型（２０）に順次当接せしめる。そして第３図Ｃに示す
ように樹脂シート（Ｓ）の周縁部を上テーブル（２３）
に付設した制限枠（２４）で成形型（２０）方向へ押し
付けてエアタイトにしたのち、成形型（２０）を樹脂シ
ート（Ｓ）との間の空気を成形型方向に真空吸引して排
除し、樹脂シート（Ｓ）を成形型（２０）に密着せし
め、然るのち、冷却離型して所定の成形品を得るものと
している。Conventionally, the vacuum forming of such a resin sheet is generally performed as follows. That is, first, as shown in FIG. 3A, a required molding die (20) is placed on a lower table (21) of a molding machine with its molding surface (20a) facing upward, The resin sheet (S) whose peripheral edge is clamped by a clamper (22) above the above is softened by heating to a predetermined temperature with a heater (not shown),
As shown in FIG. 9B, this is sequentially brought into contact with a molding die (20) whose temperature has been adjusted to a predetermined temperature in advance. Then, as shown in FIG. 3C, the peripheral portion of the resin sheet (S) is placed on the upper table (23).
After it is pressed into the molding die (20) direction with a restriction frame (24) attached to the airtight to make it airtight, the air between the molding die (20) and the resin sheet (S) is vacuum-sucked in the molding die direction and eliminated. The resin sheet (S) is brought into close contact with the molding die (20), and after that, it is cooled and released to obtain a predetermined molded product.
【０００４】[0004]
【発明が解決しようとする課題】ところが、ポリカーボ
ネート樹脂シート、とくに透明な当該樹脂シートを成形
用材料として用い、従来慣用の上記のような真空成形法
を適用して熱成形を行う場合、透明性に優れた高品位の
成形品を得ることができないという固有の問題があっ
た。このために、ポリカーボネート樹脂の優れた透明
性、耐衝撃強度等の諸特性を生かした用途においてその
使用が制限され、例えば、自動販売機用成形面板、表示
装置用成形面板等の用途において熱成形品として使用に
供されることは極めて少なかった。However, when a polycarbonate resin sheet, especially a transparent resin sheet is used as a molding material and thermoforming is performed by applying the conventional vacuum forming method as described above, the transparency is improved. There is an inherent problem that it is not possible to obtain a high-quality molded product excellent in For this reason, its use is limited in applications that make use of various properties such as the excellent transparency and impact resistance of polycarbonate resin.For example, thermoforming in applications such as vending machine molding face plate and display device molding face plate. It was rarely used as a product.
【０００５】上記のようなポリカーボネート樹脂成形品
の透明性を阻害する主な要因としては、成形型と加熱
軟化した樹脂シートの温度差により発生するドラックラ
イン、成形型と加熱軟化した樹脂シートとの擦れによ
り発生する擦りキズ、成形型と加熱軟化した樹脂シー
トとの間にゴミ・異物が入り、それが樹脂シートに転写
され発生するブツ、型肌の荒れにより樹脂シートにそ
れが転写して発生する型肌転写等の現象がある。The main factors that impede the transparency of the above-mentioned polycarbonate resin molded product are the drag line generated by the temperature difference between the mold and the heat-softened resin sheet, and the mold line and the heat-softened resin sheet. Rubbing scratches caused by rubbing, dust and foreign matter entering between the molding die and the heat-softened resin sheet, which are transferred to the resin sheet, and transferred to the resin sheet due to roughening of the mold surface There is a phenomenon such as skin transfer.
【０００６】これらの現象がとくにポリカーボネート樹
脂シートの熱成形の場合にとくに現われ易いのは、ポリ
カーボネート樹脂が、成形可能温度領域で特有の挙動を
示すためである。即ち、ポリカーボネート樹脂は、前記
のような他の熱可塑性樹脂に比較して、成形加工温度が
相対的に高く、しかも温度に対して非常に敏感で、熱時
の伸びや抗張力などの樹脂の挙動が大きく変化し易いた
めであり、このような特有の性質のために特に前記
のような現象が現われ易い。現在、このような問題を解
決しうる成形条件等は未だ確立されておらず、このため
に、特に高い透明度が要求される用途において、その熱
成形製品の実用化は阻まれていたのが実情である。These phenomena are particularly apt to appear in the case of thermoforming a polycarbonate resin sheet, because the polycarbonate resin exhibits a peculiar behavior in the moldable temperature range. That is, the polycarbonate resin has a relatively high molding processing temperature and is very sensitive to the temperature as compared with other thermoplastic resins as described above, and the behavior of the resin such as elongation and tensile strength during heating is high. Is likely to change greatly, and due to such peculiar properties, the above-mentioned phenomenon is particularly likely to occur. At present, molding conditions and the like that can solve such problems have not been established yet, and therefore, the practical use of the thermoformed products was hindered in the applications where particularly high transparency is required. Is.
【０００７】[0007]
【課題を解決するための手段】本発明者は、上記のよう
な問題点に鑑み、透明性を阻害しないポリカーボネート
樹脂シートの熱成形方法について、成形装置及び成形条
件の両面から鋭意試験と研究を行った結果、所定の設定
条件下では透明性を阻害しない真空成形が可能となるこ
とを見出し、本発明を完成した。In view of the above problems, the present inventor has conducted a diligent test and a study on a thermoforming method of a polycarbonate resin sheet which does not impair transparency, from both aspects of a molding apparatus and molding conditions. As a result of the experiments, it was found that vacuum molding can be performed without impairing transparency under a predetermined set condition, and the present invention has been completed.
【０００８】而して、本発明における上記設定条件と
は、成形型を従来のように下テーブル側に設けずに、上
テーブル側に成形面を下向きにした態様のもとに配設す
るものとすること、及び成形型の温度設定を、一般的に
推奨されている調温温度よりもかなり高めの具体的には
１４０〜１４７℃の範囲に調温して樹脂シートの真空成
形を行うものとすることを必須とし、更には、成形型の
成形面肌を、表面粗さ０．８Ｓ以下（０．８μｍＨmax
以下）の鏡面度に仕上げた成形型を用いるものとするこ
とを任意的好適条件とする。The above setting conditions in the present invention mean that the molding die is not provided on the lower table side as in the conventional case, but is arranged on the upper table side with the molding surface facing downward. And that the temperature of the molding die is considerably higher than the generally recommended temperature control temperature, specifically, the temperature is controlled in the range of 140 to 147 ° C. to perform vacuum forming of the resin sheet. In addition, the surface roughness of the molding surface of the molding die is 0.8S or less (0.8 μmHmax
It is an optional preferable condition that a molding die finished to the following) is used.
【０００９】従って、この発明は、成形型を上テーブル
側に成形面を下向きにして配設し、該成形型を１４０〜
１４７℃の範囲に調温制御した状態のもとに、所定温度
に加熱軟化したポリカーボネート樹脂シートを上記成形
型に下方から当接させ、両者間の空気を真空吸引して樹
脂シートを成形型に密着せしめるものとすることを特徴
とする、ポリカーボネート樹脂シートの熱成形方法を要
旨とする。Therefore, according to the present invention, the molding die is disposed on the upper table side with the molding surface facing downward, and the molding die is placed between 140 and
Under the condition that the temperature is controlled to be in the range of 147 ° C., the polycarbonate resin sheet heated and softened to a predetermined temperature is brought into contact with the above mold from below, and the air between the two is vacuum sucked to form the resin sheet into the mold. The gist is a thermoforming method for a polycarbonate resin sheet, which is characterized in that they are closely attached.
【００１０】この発明において、成形型（１）を従来の
一般的な真空成形の場合の型設置、即ち下テーブル側に
成形面を上向きにして設置する場合と異なり、第１図に
示すように上テーブル（２）側に成形面（１ａ）を下向
きにして配設することは、それによって次のような利点
の亨受を可能にする。第１には、ポリカーボネート樹脂
シート（Ｓ）を加熱軟化させたときに必然的に発生する
ドローダウンを、予張ブローの効果と同様に利用して、
型面への樹脂シート（Ｓ）の沿接を無理なく行わせるこ
とができ、擦り傷の発生を抑えることができる。また、
第２に、成形面を下向きにして配設するため、ゴミや異
物が成形面上に付着残存することが少なく、その結果加
熱軟化したポリカーボネート樹脂シート（Ｓ）と型
（１）の成形面（１ａ）との間に異物が介在する確率を
大幅に減少し、ブツの発生を回避することができる。In the present invention, unlike the case where the molding die (1) is installed in the conventional general vacuum molding, that is, the molding surface is installed on the lower table side with the molding surface facing upward, as shown in FIG. Arranging the molding surface (1a) facing downward on the upper table (2) side allows the following advantages to be accepted. Firstly, the drawdown that is inevitably generated when the polycarbonate resin sheet (S) is softened by heating is utilized similarly to the effect of pre-tension blow,
The resin sheet (S) can be smoothly attached to the mold surface, and the occurrence of scratches can be suppressed. Also,
Secondly, since the molding surface is arranged so as to face downward, dust and foreign matter rarely adhere and remain on the molding surface, and as a result, the polycarbonate resin sheet (S) softened by heating and the molding surface of the mold (1) ( It is possible to greatly reduce the probability that foreign matter will be present between 1a) and to avoid the occurrence of lumps.
【００１１】次に、成形型（１）の温度の制御に関し
て、この発明においては、ポリカーボネート樹脂の熱変
形温度である１３５℃より高い１４０℃以上で、同樹脂
のガラス転移温度である１５０℃より多少低い１４７℃
以下の温度範囲に厳格に制御されなければならない。こ
の温度範囲は、多くの実験結果から見出し得たもので、
上記の下限値である１４０℃より低い場合は、ドラッグ
ラインと称される冷却ムラの発生が起こり易いものとな
り、成形品の透明性が阻害される傾向に強いものとなる
一方、上限値の１４７℃をこえる高い温度に設定する
と、成形品の冷却が不十分なものとなるために離型時に
変形を生じ、形状精度の均整な成形品を得ることができ
ない。上記の温度範囲は、真空成形技術における一般的
な成形型の設定温度に較べてかなり高いものである。即
ち、真空成形の場合、一般的には、成形材料とする樹脂
の種類に応じ、離型時に成形品が変形しないように安全
性を考慮して当該樹脂の熱変形温度より１５〜２５℃低
い温度に調温するのが普通である。この慣用技術に従え
ば、ポリカーボネート樹脂シートの場合、成形型は１１
０〜１２０℃に調温することになるが、このような温度
範囲に調温制御した状態のもとでポリカーボネート樹脂
シートの真空成形を行うと、前述のようにドラッグライ
ンが発生し、透明性の高い成形品を得ることができな
い。Next, regarding the temperature control of the molding die (1), in the present invention, the temperature is 140 ° C. or higher, which is higher than the heat distortion temperature of 135 ° C. of the polycarbonate resin, and 150 ° C. which is the glass transition temperature of the resin. Somewhat low 147 ℃
The following temperature range must be strictly controlled. This temperature range can be found from many experimental results,
When the temperature is lower than the lower limit value of 140 ° C., cooling unevenness called a drag line is likely to occur and the transparency of the molded product tends to be impaired, while the upper limit value of 147 is exceeded. If the temperature is set higher than 0 ° C, the molded product will be insufficiently cooled, so that the molded product is deformed at the time of mold release, and a molded product having a uniform shape accuracy cannot be obtained. The above temperature range is considerably higher than the set temperature of a general mold in vacuum forming technology. That is, in the case of vacuum molding, in general, depending on the type of resin used as a molding material, the temperature is lower by 15 to 25 ° C. than the heat deformation temperature of the resin in consideration of safety so that the molded product is not deformed at the time of mold release. It is usual to adjust the temperature. According to this conventional technique, in the case of a polycarbonate resin sheet, the mold is 11
Although the temperature is controlled to 0 to 120 ° C., when vacuum forming of the polycarbonate resin sheet is performed under the temperature controlled control in such a temperature range, a drag line is generated as described above, and transparency is increased. It is not possible to obtain a molded product with high quality.
【００１２】上記のような成形型の特定配設とその調温
制御を条件として、それらの組合わせにより十分に透明
性に優れたポリカーボネート樹脂成形品を得ることがで
きるが、更には任意的条件として、成形型の成形品の表
面肌がなるべく平滑な鏡面に仕上げられた成形型を用い
るべきことが好適条件として挙げられる。即ち、ポリカ
ーボネート樹脂の場合、加熱軟化状態時における表面硬
度が低いため、通常程度の表面仕上げ状態の成形型を使
用する場合、加熱軟化した樹脂シートが型の成形面と接
触する際、成形品に擦り傷が付き易く、かつ型の成形面
肌が転写されて透明性が損われるおそれが生じる。した
がって、これらの現象を効果的に回避するためには、成
形型の成形面は、表面粗さにおいて０．８Ｓ（０．８μ
ｍＨmax ）以下、とくに好ましくは０．６Ｓ（０．６μ
ｍＨmax）以下の鏡面肌に仕上げられたものとすること
が望ましい。[0012] A polycarbonate resin molded article having sufficiently excellent transparency can be obtained by a combination thereof, provided that the above-mentioned specific arrangement of molding dies and temperature control thereof are conditioned. As a preferable condition, it is preferable to use a molding die in which the surface of the molded product of the molding die has a mirror surface as smooth as possible. That is, in the case of a polycarbonate resin, since the surface hardness in the heat-softened state is low, when using a mold having a normal surface finish state, when the heat-softened resin sheet comes into contact with the molding surface of the mold, It may be easily scratched, and the surface of the molding surface of the mold may be transferred to impair transparency. Therefore, in order to effectively avoid these phenomena, the molding surface of the molding die has a surface roughness of 0.8S (0.8μ).
mHmax) or less, particularly preferably 0.6S (0.6μ)
It is desirable that the mirror finished surface be less than or equal to mHmax).
【００１３】なお、この発明において、成形に使用され
るポリカーボネート樹脂シートの厚さは、特に限定され
るものではないが、１〜５ｍｍ程度のものを用いるのが
一般的である。In the present invention, the thickness of the polycarbonate resin sheet used for molding is not particularly limited, but a thickness of about 1 to 5 mm is generally used.
【００１４】[0014]
【実施例】次に、この発明の効果を実証するために、各
種の実施例を比較例との対比において示す。EXAMPLES Next, in order to demonstrate the effect of the present invention, various examples will be shown in comparison with comparative examples.
【００１５】成形材料として、厚さ３．０ｍｍのポリカ
ーボネート樹脂シート（筒中プラスチック工業株式会社
製、商品名「ポリカエース ＥＣＤ１０５」）を用い
た。As a molding material, a polycarbonate resin sheet having a thickness of 3.0 mm (manufactured by Tsutsunaka Plastic Industry Co., Ltd., trade name "Polyca Ace ECD105") was used.
【００１６】一方、成形装置は、第１図に示すように、
成形型（１）を上テーブル（２）側に、かつその成形面
（１ａ）を下向きにして取付け、下テーブル（３）側に
制限枠（４）を付設したものと、比較のために従来の一
般的な成形装置に準じて、第３図に示すように下テーブ
ル（２１）側に成形型（２０）を、上テーブル（２３）
側に制限枠（２４）を付設したものとの２種類の成形装
置を用いて成形試験を行った。On the other hand, the molding apparatus, as shown in FIG.
For comparison, the mold (1) is attached to the upper table (2) side with the molding surface (1a) facing downward, and the limiting frame (4) is attached to the lower table (3) side. According to a general molding apparatus of No. 3, as shown in FIG. 3, the molding die (20) is provided on the lower table (21) side and the upper table (23) is provided.
A molding test was performed using two types of molding devices, one with a limit frame (24) attached to the side.
【００１７】成形型（１）（２０）は、いずれも、約３
５０×７５０×５０ｍｍの箱形成形品が得られるサイズ
の雄型（展開倍率、約１．４倍）によるものとし、か
つ、その成形面（１ａ）（２０ａ）はいずれも０．６Ｓ
程度の鏡面肌に仕上げたものを用いた。The molds (1) and (20) each had about 3
It shall be based on a male mold (expansion magnification, about 1.4 times) of a size that can give a box-shaped product of 50 x 750 x 50 mm, and the molding surfaces (1a) (20a) are both 0.6S.
The one with a mirror-finished surface was used.
【００１８】そして、上記成形型（１）（２０）の設定
温度を第１表に示すように１２０〜１５０℃の範囲で変
化させるものとし、クランパー（５）（２２）で周縁部
を挾持した樹脂シート（Ｓ）を１６５℃に加熱軟化させ
た状態のもとに、上記成形型（１）（２０）に当接さ
せ、制限枠（４）（２４）で周縁部をエアタイトに圧着
したのち、成形型（１）（２０）側に設けられた抜気孔
（６）（７）を通じて成形型と樹脂シート（Ｓ）との間
の空気を真空吸引して樹脂シート（Ｓ）を成形型（１）
（２０）に密着せしめ、次いで冷却後離型して成形品を
得るものとした。上記による各種の成形試験による各成
形品について、不良現象の発生の有無を、ドラッグライ
ン、擦り傷・ブツ、成形品変形の各項目について調べ、
その結果を、下記の第１表に併記した。Then, the set temperature of the molds (1) and (20) is changed within the range of 120 to 150 ° C. as shown in Table 1, and the peripheral portions are held by the clampers (5) and (22). After the resin sheet (S) was heated and softened to 165 ° C., the resin sheet (S) was brought into contact with the molding dies (1) and (20), and the peripheral portions were pressure-bonded to the airtight by the limiting frames (4) and (24). , The air between the molding die and the resin sheet (S) is vacuumed through the vent holes (6) and (7) provided on the molding die (1) (20) side to form the resin sheet (S) into the molding die ( 1)
It was closely adhered to (20), then cooled and released to obtain a molded product. For each molded product by various molding tests according to the above, check for the occurrence of defective phenomena for each item of drag line, scratches / bugs, deformation of molded product,
The results are also shown in Table 1 below.
【００１９】[0019]
【表１】 [Table 1]
【００２０】上表に示すように、この発明の規定条件に
従う実施例１〜３による成形品は、いずれもドラックラ
イン、擦り傷やブツ、変形等の不良現象を有さず、透明
性及び形状精度に優れたものであることを確認し得た。As shown in the above table, the molded articles according to Examples 1 to 3 according to the specified conditions of the present invention do not have any defective phenomena such as drag lines, scratches, scratches, and deformation, and have transparency and shape accuracy. It was confirmed that it was excellent.
【００２１】これに対し、成形型の設定温度が１４０℃
より低い比較例１、２においては、成形品にドラッグラ
インの発生が見られ、また１４７℃より高い比較例３で
は、成形品が冷却されず変形を有するものであった。更
に、成形型を下テーブル側に配置した比較例４、５にお
いては、成形型温度を規定温度範囲に制御してもなお、
成形製品にドラッグライン、ブツ等の表面欠陥を生じ、
透明性に劣るものしか得ることができなかった。On the other hand, the set temperature of the mold is 140 ° C.
In the lower comparative examples 1 and 2, the generation of a drag line was observed in the molded product, and in the comparative example 3 higher than 147 ° C., the molded product was not cooled and had deformation. Further, in Comparative Examples 4 and 5 in which the molding die is arranged on the lower table side, even if the molding die temperature is controlled within the specified temperature range,
Surface defects such as drag lines and spots occur on molded products,
Only the one with inferior transparency could be obtained.
【００２２】[0022]
【発明の効果】この発明は上述の次第で、ポリカーボネ
ート樹脂シートを成形材料とする真空成形法において、
ドラッグライン、擦り傷、ブツ等の欠陥を有さず、従っ
て透明性に優れた成形品を形状変形のない均整な高品位
のものに成形することが可能になる。従って、従来、高
度な透明性が要求される故に使用できなかったような用
途においても、ポリカーボネート樹脂製品を真空成形に
よる熱成形品として安価に製作提供することが可能とな
り、該樹脂シートの用途の拡大化に貢献しうる。As described above, the present invention provides a vacuum molding method using a polycarbonate resin sheet as a molding material.
It is possible to mold a molded product having no defects such as drag lines, scratches, and scratches and having excellent transparency into a uniform high-quality product without shape deformation. Therefore, it is possible to inexpensively manufacture and provide a polycarbonate resin product as a thermoformed product by vacuum forming even in an application that cannot be used because a high degree of transparency is conventionally required. It can contribute to expansion.
【図１】本発明による真空成形装置の縦断面図FIG. 1 is a vertical sectional view of a vacuum forming apparatus according to the present invention.
【図２】本発明による真空成形工程の説明図FIG. 2 is an explanatory diagram of a vacuum forming process according to the present invention.
【図３】従来法による真空成形工程の説明図FIG. 3 is an explanatory view of a vacuum forming process by a conventional method.
１…成形型 １ａ…成形面 ２…上テーブル ３…下テーブル Ｓ…ポリカーボネート樹脂シート 1 ... Mold 1a ... Molding surface 2 ... Upper table 3 ... Lower table S ... Polycarbonate resin sheet
Claims (1)
にして配設し、該成形型を１４０〜１４７℃の範囲に調
温制御した状態のもとに、所定温度に加熱軟化したポリ
カーボネート樹脂シートを上記成形型に下方から当接さ
せ、両者間の空気を真空吸引して樹脂シートを成形型に
密着せしめるものとすることを特徴とする、ポリカーボ
ネート樹脂シートの熱成形方法。1. A polycarbonate softened by heating to a predetermined temperature under the condition that the molding die is disposed on the upper table side with the molding surface facing downward, and the temperature of the molding die is controlled in the range of 140 to 147 ° C. A thermoforming method for a polycarbonate resin sheet, comprising: bringing a resin sheet into contact with the above-mentioned molding die from below and sucking air between them so that the resin sheet is brought into close contact with the molding die.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2754091A JPH0671763B2 (en) | 1991-02-21 | 1991-02-21 | Thermoforming method for polycarbonate resin sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2754091A JPH0671763B2 (en) | 1991-02-21 | 1991-02-21 | Thermoforming method for polycarbonate resin sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04265729A JPH04265729A (en) | 1992-09-21 |
| JPH0671763B2 true JPH0671763B2 (en) | 1994-09-14 |
Family
ID=12223923
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2754091A Expired - Fee Related JPH0671763B2 (en) | 1991-02-21 | 1991-02-21 | Thermoforming method for polycarbonate resin sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0671763B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7066234B2 (en) | 2001-04-25 | 2006-06-27 | Alcove Surfaces Gmbh | Stamping tool, casting mold and methods for structuring a surface of a work piece |
| JP2006043995A (en) * | 2004-08-03 | 2006-02-16 | Mitsubishi Plastics Ind Ltd | Container and its molding method |
| BRPI0822215A2 (en) | 2008-02-27 | 2015-06-23 | Sharp Kk | Roll Nanolithography Apparatus, Roll Mold for Use on Roll Nanolithography Apparatus, Set Roller for Use on Roll Nanolithography Apparatus, and Nanolithography Sheet Production Method |
| BRPI0822282A2 (en) | 2008-03-04 | 2015-06-30 | Sharp Kk | Optical element, roller type nano-printing apparatus and die cylinder production process |
| EP2979844B1 (en) | 2014-04-22 | 2018-08-15 | Sharp Kabushiki Kaisha | Sterilization method by using the surface of a synthetic polymer film and method for reactivating this surface |
-
1991
- 1991-02-21 JP JP2754091A patent/JPH0671763B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04265729A (en) | 1992-09-21 |
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