JPS5933111A - Method of forming blister - Google Patents

Abstract

PURPOSE:To obtain a molded blister article without a bridge between the blisters, by using a mold table having movable molds that can be moved vertically through the mold table. CONSTITUTION:When a plastic sheet 4 is to be molded to have a plurality of relatively deep blisters 5 for housing items with a narrow space therebetween, the mold table 1 with the movable molds 2 that can be moved vertically through the mold table is used. First the movable molds 2 are lowered so that the tops of the movable molds may be flushed with the top surface of the mold table 1, then the heated and softened plastic sheet 4 is placed on the mold table 1, and then keeping the plastic sheet 4 in firm contact with the top surface of the mold table 1 by suction, the movable molds 2 are elevated to form the blisters 5 in the plastic sheet 4 for housing items. Accordingly, a bridge 10 between the adjacent blisters 5, 5 can be prevented from being formed.

Description

【発明の詳細な説明】 本発明は、ブリッジの発生を防止するようにしたブリス
ター成形方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a blister forming method that prevents the occurrence of bridging.

ブリスター成形によシ、水銀電池用のように小さくて深
い収納凹部を狭い間隔で成形する場合には、プラスチッ
クシート厚が薄肉化の方向に移行しつつあることも！、
り、、ブリッジ、すなわち収納凹部間のしわの出易い傾
向にある。また、熱により伸びる性質のプラスチックシ
ートは成形のため６加熱に上りたるんでＪブ□リッジが
特に生じ易い。In addition to blister molding, when molding small and deep storage recesses at narrow intervals, such as for mercury batteries, the thickness of plastic sheets is becoming thinner! ,
However, there is a tendency for wrinkles to form between the bridges, that is, the storage recesses. In addition, plastic sheets that can be stretched by heat are particularly prone to J-bridges due to sagging during heating during molding.

現在広汎に用いられているブリスター成形方法は牙４図
め如き金型８を用いるものである。牙４図は従来のブリ
スター成形方法に用いる金型（断面図）およびこれによ
る成形工程の説明図を・水子。A blister molding method that is currently widely used uses a mold 8 having a shape similar to that shown in FIG. Figure 4 shows the mold (cross-sectional view) used in the conventional blister molding method and an explanatory diagram of the molding process using it.

オ゛図は第４図０金型を用いた従±孕による竪形中の斜
視図１．オ、６図は牙５図ΩＶ＋−Ｗ線による断面甲を
示す・金型８の黙引＃Ｌ　ａ　ｅ通、１てプラそチツク
シ、ニド±を吻引し金型８の表面の形にシート４を成形
下る方性τあ今ソ゛・オ、５図・オ６図に見シれるよう
に収セ凹部５の中、門にブリッジＩＯが一生し易い。こ
の対策として牙４図に示すように吸引時に補助型９（雌
型）を金−８の上から押、Ｌ６てて収納凹部間のシート
を引き伸ばしながら成形する方法があるが、補助型の上
下（時間を要し、またその製作費を必要とする。さらに
補助型（よってシート表面に傷が入セ外竺が省るりどの
欠点がある。Figure 4 is a perspective view of a vertical shape using a mold. E, Figure 6 shows the cross-section taken by the line ΩV+-W in Figure 5. As shown in Figures 5 and 6, it is easy for the bridge IO to remain at the gate in the receiving recess 5 due to the direction of forming the sheet 4. As a countermeasure for this, there is a method of pressing the auxiliary mold 9 (female mold) from above the metal 8 during suction, and stretching the sheet between the storage recesses using L6 while forming the mold, as shown in Figure 4. (It takes time and costs to produce it.Furthermore, the auxiliary type has drawbacks such as scratches on the sheet surface and the loss of outer edges.)

本発明け１．、、、、Ｈ，上の問題点を解消したもの、
ア、そｉ、ｌ’　ｌ　’、ＩＩ　、、、、ｌ、’、’、
、１゜の要旨とするところは、１．金型台に該金型台を
貫、通１１１１１１１ して上下□動可□能な移動艙ヲ設けておき、まず移動型
を下げ金型台上面を平らにした状、態で、加熱状、。The present invention 1. , , ,H, which solves the above problems,
A, soi, l'l', II ,,,,l,',',
The main points of , 1° are: 1. The mold table is provided with a movable shaft that can move up and down through the mold table.First, the movable mold is lowered and the upper surface of the mold table is made flat. .

化したプラスチックシートを真空吸引して金型台■上面
に密着させ、字だプラスチックシートが軟化しているう
ちに真空で吸引したまま、移動型を上昇させ該移動型に
沿ってプラスチックシートを成形するようにしたブリス
ター成、形方法である。The molded plastic sheet is vacuum-suctioned and brought into close contact with the upper surface of the mold stand, and while the plastic sheet is softened, the movable mold is raised while vacuum is being applied, and the plastic sheet is molded along the movable mold. This is a method of forming and forming a blister.

次に図面によって本発明の、ブリスター成形分法を説１
す６−、オ”〜１°、図は本発明、。７゛９リー成形方
法に用いる金型（断面図）お、よびこれによるブリスタ
ー成形１桿の説明図を示す。図におい、てｌは金型台、
２は移動型、３は吸引孔、４はプラスチックシート、５
は収納凹部、６はシート押えクランプ、７はヒーターで
ある。Next, the blister forming method of the present invention will be explained with reference to the drawings.
The figure shows a mold (cross-sectional view) used in the present invention, . is the mold stand,
2 is a movable type, 3 is a suction hole, 4 is a plastic sheet, 5
6 is a storage recess, 6 is a sheet holding clamp, and 7 is a heater.

すなわち第１図乃至第３図に見られるようにピストン状
移動型２を矢印方向に移動できるようにセットしておき
、まず第１図に示すように移動型２を下げて金型台１の
上面が平らになるようにし：　て、おく。ヒーター７で
シート４を軟化させ、第２図、のよう咳吸引孔３から吸
引し表からシート４を金型中　　１：１．　　・　　　
　□１゜ □台１に□沿つそ成形して金型台１上面に密着する。次
・にす：ぐに牙３．図に・見□られるように吸引孔３を
通じて′□咳引したままＪシニト４がま屑軟□化状態に
ある間に移動型２を押し上げブリスター成形して収納四
部５を形成する。その後１ショット分取り出し適当な大
きさにトリミングする。本発明のブリスター成形方法に
よるときは、加熱軟化またシート４を金型台ｌ上面に吸
引密着した状態で移動型２を上昇させるので、凹部５の
中間部！吸引、−案し牟まま凹部形成を行なうことがで
き、従来の方法に本る成形品（第５゜６図）のようにブ
リスター間にブリッジｌＯが発生しない。　　　　　・ なお、本例の如き凸状あるいは凹状（図示せず）の全体
形状の金型台１を用いる場合はその全体形状に沿ってシ
ート４を伸張成形することにより、シート４に収縮しよ
うとする傾向が生じるため、移動型２によシ凹部５を形
成したときにシート４が移動型２及び金型台ｌ上面にさ
らに強く密着し、ブリッジが生じ雛＜、成形湯度に、加
熱した時、にたるむ傾向のあるシートでも使用できるの
で好ま１い。That is, as shown in FIGS. 1 to 3, the piston-shaped movable mold 2 is set so as to be movable in the direction of the arrow. First, as shown in FIG. Make sure the top surface is flat: and set aside. The sheet 4 is softened with the heater 7, and suction is applied through the cough suction hole 3 as shown in Fig. 2, and the sheet 4 is placed in the mold from the front side 1:1.・
□1゜□Mold along □ on the stand 1 and tightly adhere to the upper surface of the mold stand 1. Next Nisu: Guni Fang 3. As seen in the figure, the movable die 2 is pushed up to form a blister while the cough is being coughed through the suction hole 3 and the J-shinito 4 is in a softened state to form the four storage parts 5. Then take out one shot and trim it to an appropriate size. When using the blister molding method of the present invention, the movable mold 2 is raised while the sheet 4 is heated and softened and brought into close contact with the upper surface of the mold table l by suction, so that the middle part of the recess 5! Suction and recess formation can be carried out without any change, and bridges 10 do not occur between the blisters as in the molded product according to the conventional method (Figs. 5-6).・In addition, when using a mold base 1 having a convex or concave (not shown) overall shape as in this example, the sheet 4 is stretched and molded along the overall shape to try to shrink into the sheet 4. As a result, when the recessed portion 5 is formed in the movable mold 2, the sheet 4 adheres more tightly to the movable mold 2 and the upper surface of the mold table l, and a bridge occurs when heated to the molding temperature. This is preferred because it can be used even with sheets that tend to sag.

さらに本発明の効果を誉げれば１、■第１次成形から第
２次成形（第３図）への工程は瞬間的に行なわれ、それ
、によって成形のスピードアップができる。、■不良、
率が大幅に減少する。■外観の良好な成形物を併ること
ができる。Furthermore, the effects of the present invention are as follows: (1) The process from primary molding to secondary molding (Fig. 3) is carried out instantaneously, thereby speeding up the molding process. ,■Defective,
rate is significantly reduced. ■It is possible to create molded products with good appearance.

【図面の簡単な説明】[Brief explanation of the drawing]

牙ｌ−λ図は本発明のブリスター成形分法に用いる金型
辷断面□図）およびこれにｉるブリスター成形工程゛の
説萌藺を示すニ第４爾行従来のブリスター成形分法′に
用いる釡型（断面図）およびこれによゑ成形工程説ｉ図
を示す。第５−は第４１の金−を用いた一来法による成
形品の斜視図、牙６図は穿５−めＶｔ−Ｗ線による断面
図金示す。 ′１・：・金型４２・！・移動型　３・・・吸引孔４・
・・プ、′５スチツクシー卜　５・・・収納凹部６・・
ルニト押えクランプ　ラ・・・ミニター８・・・金型　
９・・・補助型　１０−・・ブリッジ特許出願人　　三
菱樹脂株式会社 代理人　弁理士　大　野　善□夫Figure l-λ is a side cross-sectional view of the mold used in the blister molding method of the present invention) and a preliminary explanation of the blister molding process is shown in Figure 4. The kettle mold (cross-sectional view) used and a diagram illustrating the molding process are shown. No. 5- is a perspective view of a molded product made by the conventional method using No. 41 gold, and Figure 6 is a cross-sectional view taken along the Vt-W line of the 5-th hole. '1・:・Mold 42・!・Movable type 3...Suction hole 4・
...pu,'5 stick seat 5...storage recess 6...
Lunit presser clamp La... Minitor 8... Mold
9...Auxiliary type 10-...Bridge patent applicant Mitsubishi Plastics Co., Ltd. agent Patent attorney Yoshio Ohno

Claims (1)

【特許請求の範囲】[Claims] 金型台に該金型台を貫通して上下動可能な移動型を設け
ておき、まず移動型を下げ金型台上面を平らにした状態
で、加熱軟化したプラスチックシー）を真空吸引して金
型台上面に蜜漬させ、まだプレスチックシートが軟化し
ているうちに真空で吸引したまま１．移動型を上昇させ
−１忙沿ってプラスチックシートを成形するようにし苑
ブリスター成形方法。A movable mold that can penetrate the mold table and move up and down is installed in the mold table. First, with the movable mold lowered and the top surface of the mold table flattened, the heat-softened plastic sheet is vacuum-suctioned. 1. Place the plastic sheet on the top of the mold table and vacuum it while it is still softening. The blister molding method involves raising the movable mold and molding the plastic sheet along one axis.