JP2803213B2 - Sheet heating device - Google Patents
Sheet heating deviceInfo
- Publication number
- JP2803213B2 JP2803213B2 JP1234076A JP23407689A JP2803213B2 JP 2803213 B2 JP2803213 B2 JP 2803213B2 JP 1234076 A JP1234076 A JP 1234076A JP 23407689 A JP23407689 A JP 23407689A JP 2803213 B2 JP2803213 B2 JP 2803213B2
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- heating
- pores
- air
- suction
- 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
- Injection Moulding Of Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Description
本発明は、熱可塑性材料のシートを塑性加工のために
加熱する装置に関する。The present invention relates to an apparatus for heating a sheet of thermoplastic material for plastic working.
熱可塑性材料のシートを、代表的には真空成形のため
に加熱可塑化する手段としては、赤外線ランプや電気ヒ
ータなど種々あるが、対象や実施場面によっては、「熱
盤」とよばれる平板状の加熱装置に接触させる方法が好
ましいことがある。たとえば、射出成形と同時に絵付け
を行なう場合の化粧シートまたは転写シートを、射出金
型に入れるに先立って真空成形により予備成形するよう
な場合がそうである。 このような目的で使用する熱盤は、通常は金属製の板
の裏面に電気ヒータなどの加熱源を置いたものであっ
て、シートが熱盤に密着して全体が均一に加熱されるよ
う、表面に多数の細孔を設け、この細孔を通して減圧吸
引するように構成したものが用いられるようになった。 このタイプの熱盤においては、吸引によりシートが表
面に密着したとき、空気が残る部分があると、加熱が均
一にできず差し支える。といって、サイクルは迅速にで
きないと生産性が低い。また、細孔の存在が、その跡を
真空成形後の成形品にまで残すことは好ましくない。従
来の熱盤は、こうした点が十分満足できるレベルには至
っていない。As means for heating and plasticizing a sheet of thermoplastic material typically for vacuum forming, there are various means such as an infrared lamp and an electric heater. May be preferred. For example, such a case is a case where a decorative sheet or a transfer sheet in which painting is performed at the same time as injection molding is preformed by vacuum forming prior to being put into an injection mold. The hot plate used for such a purpose usually has a heating source such as an electric heater placed on the back surface of a metal plate, so that the sheet is in close contact with the hot plate and the whole is uniformly heated. A number of fine holes are provided on the surface, and suction is performed under reduced pressure through the fine holes. In a hot plate of this type, when the sheet is brought into close contact with the surface by suction, if there is a portion where air remains, the heating cannot be performed uniformly, which hinders the heating. However, if the cycle cannot be performed quickly, the productivity is low. Further, it is not preferable that the presence of the pores leave traces of the pores on the molded article after vacuum forming. The conventional hot plate has not reached a level where these points are sufficiently satisfactory.
本発明の目的は、上記したような問題を解消し、熱可
塑性材料のシートを加熱可塑化する装置において、迅速
に減圧吸収しても空気が残ることなくシートが表面に密
着して均一な加熱を行なうことができ、しかも吸引用の
細孔の跡が真空成形品に実質上残らないような装置を提
供することにある。An object of the present invention is to solve the above-mentioned problems, and in a device for heating and plasticizing a sheet of a thermoplastic material, even if the pressure is rapidly reduced and absorbed, the sheet adheres to the surface without leaving air, and uniform heating is achieved. It is an object of the present invention to provide a device which can perform the above-mentioned process and furthermore, the trace of the suction pore does not substantially remain in the vacuum molded product.
本発明のシート加熱装置は、図面に示すように、ほぼ
平面状の表面（１）を有し、内部に加熱源（３）をそな
えるとともに表面に多数の細孔（２）を形成してあり、
この細孔を通して減圧吸引することにより熱可塑性材料
のシートを上記表面に密接させて保持し、その間に上記
加熱源から熱を与えてシートを可塑化する装置におい
て、上記細孔を0.1〜2.5個/cm2の密度で設け、かつ上記
表面のアラサを平均20〜800μｍ、好ましくは20〜200μ
ｍの範囲に調節したことを特徴とする。 図において符号（４）は、減圧吸引のためのエアラン
ナーである。 上記細孔は、その直径を0.3〜0.6mmの範囲に形成する
ことが好ましい。As shown in the drawing, the sheet heating apparatus of the present invention has a substantially planar surface (1), has a heating source (3) inside, and has a large number of pores (2) formed on the surface. ,
By suctioning through the pores under reduced pressure, a sheet of thermoplastic material is held in close contact with the surface, and in the meantime, heat is applied from the heating source to plasticize the sheet. / cm 2 density, and the average surface roughness of the surface is 20 to 800 μm, preferably 20 to 200 μm
m is adjusted. In the figure, reference numeral (4) denotes an air runner for suction under reduced pressure. The pores are preferably formed to have a diameter of 0.3 to 0.6 mm.
熱可塑性材料のシートを減圧吸引により熱盤上に密接
させるときに、間に空気が残らない条件を求めて研究し
た結果、発明者らは、吸引する細孔の分布と熱盤表面の
アラサを適切にえらぶべきことを見出した。すなわち、
細孔は表面の1cm2あたり少なくとも0.1個、好ましくは
１個内外存在させることにより、シートとの間に空気が
残るおそれが小さくなる。 熱盤表面が鏡面であるとシートとの間に空気が閉じ込
められやすく、シートが十分加熱されない部分ができる
のに対し、粗面であれば、凹凸により与えられる流路を
通じて空気が流通するため、空気が閉じ込められる心配
がない。この効果を確保するには、表面のアラサが20μ
ｍ以上あればよいことがわかった。アラサが過大になる
と、シートと熱盤表面が完全に密着せず熱伝導度が場所
により異なって、シート温度が均一に高まらなくなると
か、シートが熱盤表面の凹凸に従って成形されてしま
い、後の真空成形に支障を来たすことがある。もちろ
ん、熱盤の凹凸がシートに転写されては困る場合も少な
くない。 これらの点を考慮して、アラサの上限を800μｍとし
た。射出絵付成形に用いる化粧シートの厚さは通常25〜
500μｍであり、この厚さのシートを加熱するには、ア
ラサ200μｍまでが好適である。20〜800μｍの範囲の凹
凸は、金属板に対して、ヘアライン加工、サンドブラス
ト、あるいはエッチングなどの加工を施することによっ
て形成できる。 一方、吸引し加熱可塑化したシートに細孔の跡を残さ
ないためには、孔の数は少ない方がよい。2.5個/cm2の
上限は、この観点から設けた。 細孔の径は、小さい方が成形品に残った跡が目立たな
いが、迅速な吸引密着を実現するためには空気の通りや
すい方がよいから、適当な範囲として上記直径0.3〜0.6
mmをえらんだ。As a result of studying the conditions under which air does not remain when a sheet of thermoplastic material is brought into close contact with the hot plate by vacuum suction, the inventors found that the distribution of the pores to be sucked and the roughness of the hot plate surface were reduced. I found something to choose properly. That is,
The presence of at least 0.1, and preferably one or more pores per cm 2 of the surface reduces the risk of air remaining between the sheet and the sheet. When the hot platen surface is a mirror surface, air is easily trapped between the sheet and the sheet, which is not sufficiently heated, whereas a rough surface allows air to flow through a channel provided by unevenness. There is no worry that air will be trapped. To ensure this effect, the surface roughness should be 20μ.
It was found that it would be better if m or more. When the roughness is too large, the sheet and the hot platen surface do not completely adhere to each other, the thermal conductivity varies depending on the location, the sheet temperature does not increase uniformly, or the sheet is formed according to the unevenness of the hot platen surface, It may interfere with vacuum forming. Of course, there are many cases where it is difficult to transfer the unevenness of the hot plate to the sheet. In consideration of these points, the upper limit of Arasa is set to 800 μm. The thickness of the decorative sheet used for injection painting is usually 25 ~
To heat a sheet of this thickness, Arasa up to 200 μm is suitable. The unevenness in the range of 20 to 800 μm can be formed by subjecting a metal plate to processing such as hairline processing, sandblasting, or etching. On the other hand, in order to leave no trace of pores on the sheet that has been suctioned and heat plasticized, the number of pores is preferably small. The upper limit of 2.5 pieces / cm 2 was set from this viewpoint. The smaller the pore size, the smaller the traces left on the molded product are inconspicuous, but it is better that the air can easily pass through in order to realize quick suction adhesion.
I chose mm.
SUS304ステンレス鋼の板にサンドブラスト加工を施し
て、平均アラサが100μｍ、最大で200μｍの粗面に加工
した。これに、直径0.4mmの孔を上下、左右とも10mmピ
ッチで千鳥状配列で設け、図面に示す構造の、エアラン
ナーをそなえ電気ヒータを組み込んだ熱盤を製作した。
熱盤のサイズは29cm×20cmで、縦横とも縁から10mmのと
ころから孔がはじまるから、孔のある部分の面積は28cm
×19cm＝532cm2、孔の数は１行28個のもの19列と１行27
個のもの18列の合計で1018個となり、密度は1.91個/cm2
である。 この熱盤を、特公昭50−19132号に記載の絵付、合成
樹脂成形品の製造方法で代表される、射出成形と同時に
絵付けを行なう成形品製造に使用した。すなわち、絵付
けのための化粧シートを射出成形金型キャビティを利用
して、真空成形により予備成形するに当り、巻取ロール
から繰り出した化粧シートをこの熱盤に吸引し、加熱し
て可塑化させながら開いた射出成形金型のキャビティ側
の上に、熱盤ごと移動することにより移行させ、キャビ
ティ側を真空吸引したのちに熱盤側から空気圧を加え、
真空成形を行なって熱盤を引き上げ、射出成形金型を閉
じ、射出成形を行なうというサイクルである。A SUS304 stainless steel plate was subjected to sandblasting to be processed into a rough surface having an average arasa of 100 μm and a maximum of 200 μm. A hot plate with a 0.4 mm diameter hole was provided in a zigzag pattern at a pitch of 10 mm on both the top and bottom and the left and right sides.
The size of the hot plate is 29 cm × 20 cm, and the hole starts from 10 mm from the edge both vertically and horizontally, so the area of the hole is 28 cm
× 19 cm = 532 cm 2 , the number of holes is 28 in one row, 19 columns and 27 in one row
The total of 18 rows of 10 pieces is 1018 pieces, the density is 1.91 pieces / cm 2
It is. This hot plate was used for the production of a molded article which is painted simultaneously with injection molding, as represented by the method for producing a painted and synthetic resin molded article described in Japanese Patent Publication No. 50-19132. In other words, when the decorative sheet for painting is preformed by vacuum molding using the injection molding die cavity, the decorative sheet drawn out from the winding roll is sucked into this hot platen, heated and plasticized. While moving the hot platen on the cavity side of the opened injection mold while moving it, it is shifted by moving, the vacuum side is applied to the cavity side after vacuum suction,
In this cycle, the hot platen is pulled up by vacuum forming, the injection mold is closed, and injection molding is performed.
本発明の加熱装置は、熱可塑性材料のシートに対して
真空成形などの塑性加工をするために加熱する場合に使
用して、減圧吸引したときに熱盤とシートとの間に空気
が残ることなく密着し、均一な加熱を迅速に行なうこと
ができる。しかも可塑化されたシートの方に吸引孔や熱
盤表面の凹凸が転写されず、美麗な成形品を与える。The heating device of the present invention is used when heating a sheet of a thermoplastic material for plastic working such as vacuum forming, and air is left between the hot platen and the sheet when suction is performed under reduced pressure. It can adhere quickly and can perform uniform heating quickly. Moreover, the suction holes and the unevenness of the hot platen surface are not transferred to the plasticized sheet, so that a beautiful molded product is obtained.
図面は本発明のシート加熱装置の構造を示すものであっ
て、第１図は一部を切り欠いて内部を示した平面図であ
り、第２図は第１図Ａ−Ａ断面図、第３図は第２図の一
部を拡大して詳細を示した図である。 １……表面 ２……細孔 ３……加熱源 ４……エアランナーBRIEF DESCRIPTION OF THE DRAWINGS The drawings show the structure of the sheet heating apparatus of the present invention, FIG. 1 is a plan view showing the inside of the sheet heating device with a part cut away, FIG. FIG. 3 is an enlarged view of a part of FIG. DESCRIPTION OF SYMBOLS 1 ... Surface 2 ... Pore 3 ... Heating source 4 ... Air runner
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) B29C 51/42,51/18 - 51/26 B29C 33/42──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 6 , DB name) B29C 51 / 42,51 / 18-51/26 B29C 33/42
Claims (2)
そなえるとともに表面に多数の細孔を形成してあり、こ
の細孔を通して減圧吸引することにより熱可塑性材料の
シートを上記表面に密接させて保持し、その間に上記加
熱源から熱を与えてシートを可塑化する装置において、
上記細孔を0.1〜2.5個/cm2の密度で設け、かつ上記表面
のアラサを平均20〜800μｍの範囲に調節したことを特
徴とするシート加熱装置。1. A sheet of thermoplastic material having a substantially planar surface, a heating source inside, and a large number of pores formed on the surface. In the apparatus for plasticizing the sheet by applying heat from the above-mentioned heating source while holding it in close contact with
A sheet heating apparatus characterized in that the pores are provided at a density of 0.1 to 2.5 / cm 2 and the surface roughness is adjusted to an average of 20 to 800 μm.
した請求項１のシート加熱装置。2. The sheet heating apparatus according to claim 1, wherein said fine holes have a diameter of 0.3 to 0.6 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1234076A JP2803213B2 (en) | 1989-09-08 | 1989-09-08 | Sheet heating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1234076A JP2803213B2 (en) | 1989-09-08 | 1989-09-08 | Sheet heating device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0396320A JPH0396320A (en) | 1991-04-22 |
| JP2803213B2 true JP2803213B2 (en) | 1998-09-24 |
Family
ID=16965224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1234076A Expired - Fee Related JP2803213B2 (en) | 1989-09-08 | 1989-09-08 | Sheet heating device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2803213B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2695348B2 (en) * | 1992-04-28 | 1997-12-24 | 大日本印刷株式会社 | Injection molding simultaneous painting device |
| JP3434252B2 (en) * | 1999-11-08 | 2003-08-04 | シャープ株式会社 | Recording medium transport device |
| JP5399087B2 (en) * | 2009-01-29 | 2014-01-29 | 富士フイルム株式会社 | Crystalline polymer microporous membrane, method for producing the same, and filter for filtration |
| JP5260368B2 (en) * | 2009-03-17 | 2013-08-14 | アピ株式会社 | Mold for blow molding and method for producing resin molded body |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0330777Y2 (en) * | 1985-07-01 | 1991-06-28 | ||
| JPH01110926A (en) * | 1987-10-26 | 1989-04-27 | Idemitsu Petrochem Co Ltd | Molding die |
-
1989
- 1989-09-08 JP JP1234076A patent/JP2803213B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0396320A (en) | 1991-04-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080717 Year of fee payment: 10 |
|
| LAPS | Cancellation because of no payment of annual fees |