JP3558135B2 - In-mold injection molding simultaneous painting mold - Google Patents

In-mold injection molding simultaneous painting mold Download PDF

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Publication number
JP3558135B2
JP3558135B2 JP26488191A JP26488191A JP3558135B2 JP 3558135 B2 JP3558135 B2 JP 3558135B2 JP 26488191 A JP26488191 A JP 26488191A JP 26488191 A JP26488191 A JP 26488191A JP 3558135 B2 JP3558135 B2 JP 3558135B2
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Japan
Prior art keywords
mold
painting
sheet
gate
injection molding
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JP26488191A
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JPH0596574A (en
Inventor
和久 小林
功 吉村
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Dai Nippon Printing Co Ltd
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Dai Nippon Printing Co Ltd
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    • 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
    • B29C45/14065—Positioning or centering articles in the mould
    • 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
    • B29C45/1418—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 the inserts being deformed or preformed, e.g. by the injection pressure
    • B29C45/14262—Clamping or tensioning means for the insert

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Description

【０００１】
【産業上の利用分野】
本発明は、絵柄を有する連続絵付シートをキャビティの内壁に射出圧により押付け、射出成形と同時に絵付をするためのインモールド射出成形同時絵付用金型に関する。
【０００２】
【従来の技術】
一般に、インモールド射出成形同時絵付装置は、図３に示すように、可動の雌型１００と、この雌型１００に対向して固定された雄型１０１とを有し、これら両金型１００、１０１の間を絵柄が所定ピッチで形成された連続絵付シートＳが供給ロール１０２と、巻取ロール１０３間を走行するようになっている。供給ロール１０２の近傍にはピンチローラ１０４が設けられ、このピンチローラ１０４の下方には前記雌型１００のキャビティの所定位置に絵付シートＳを位置決めするためのセンサ１０５が設けられている。
【０００３】
かかるインモールド射出成形同時絵付装置においては、図４に示すような板状の製品１０６が成形され、製品１０６の上面の絵付面には絵柄Ｐが形成される。このような製品１０６の成形するためには、図５に示すように、キャビティ１０８が形成された雌型１００を使用する。このキャビティ１０８の内壁側に絵付シートＳが位置するように雄型１０１を重ね合わせ、この状態で射出すると射出圧により連続絵付シートＳの押付が行われ、図４に示すような製品１０６が成形される。
【０００４】
【発明が解決しようとする課題】
しかしながら、前述の射出成形時に、図６に示すように、キャビティ１０８の隅部にシワＷが形成されたり、或いはその部分に破れが生じたりする。符号ｇは、ゲートである。
【０００５】
特に、キャビティ１０８が二次曲面・大面積等の場合には、絵付シートＳを射出圧により三次元形状に著しく延伸させるので、前記シワ、破れが生じやすい。
そこで、本発明は、絵付シートの射出成形時にシワ、破れ等が生じることがなく、しかも正確な絵付模様が形成された成形品（製品）を得ることができるインモールド射出成形同時絵付用の金型を提供することを目的とする。
【０００６】
【課題を解決するための手段】
本発明は上記課題を解決するために、対向配置された雌型と雄型との間に絵付シートを配置した状態でゲートから射出樹脂を流し込み、射出圧力により成形と絵付とを同時に行うインモールド射出成形同時絵付用金型において、前記ゲートは前記雌型と雄型とで形成されるキャビティの製品形成部であって、縦方向中央部であり、かつ、横方向の中央部でない位置に、外周部に対して遠近を有するように形成されてなり、当該製品形成部の外周部の前記ゲートの近傍であって当該外周部の縦方向上下部にのみ、前記雌型と雄型の一方に前記絵付シートを協働して挟持する係合突起を設け、他方に前記係合突起と係合する係合凹部を設けた。
【０００７】
【作用】
本発明によれば、絵付シートを金型間に挟んで射出可能状態にすると、係合突起と係合凹部との間に絵付シートがしっかりと挟持され、絵付シートのズレが少なくなる。一方、ゲートから遠い位置は、元来射出時に絵付シートの歪みが蓄積し、シワが多くなる。これに対して、ゲートから近い位置は前記歪みの蓄積が少ないのでシワの発生が少ない。従って、ゲートから遠い位置はパーティングラインによるクリアランスのために絵付シートは僅かに滑り、シワが少なくなる。よって、ゲートから近い位置と遠い位置のシワのバランスがとれ、絵付シート全体としてはシワが発生し難くなる。
【０００８】
【実施例】
以下、本発明を図示の実施例に基づいて説明する。図１に本実施例の金型の斜視図および断面図を示す。
【０００９】
図１（Ａ）、（Ｂ）に示すように、本発明のインモールド射出成形同時絵付用の金型は、可動な雌型１と、この雌型１に対向配置された固定されている雄型２とからなる。前記両金型１、２の間に絵柄が形成された連続絵付シートＳが矢印Ｙ方向に走行可能に配置される。
【００１０】
雌型１には平坦な凹み面３が形成され、凹み面３の縦方向中央部で横方向やや左方にはゲート４が形成されている。雌型１の前面の上部平坦部にはウレタン製の半円柱状の係合突起５が設けられ、雌型１の下部平坦部には同様の係合突起６が設けられている。前記係合突起５、６は、符号Ｒ１で示す部分の高さの方が、符号Ｒ２で示すの高さよりやや高くなったテーパを形成している。なお、係合突起５、６の材料としては前記ウレタン以外にシリコンゴム、弗素ゴム、金属等が好適である。また、係合突起５、６の長さは、成形される製品の幅の１０〜６０％が好ましい。
【００１１】
雄型２の前面には前記凹み面３に挿入されるコア部２２が形成され、このコア部２２と前記雌型１の凹み面３とでキャビティＣが形成される。即ち、製品形成部である凹み面３とコア部２２とによりキャビティＣが形成される。雄型２の上部平坦部には前記係合突起５に係合するように係合凹部２３が形成され、雄型２の下部平坦部には前記係合突起６に係合するように係合凹部２４が形成されている。
【００１２】
前記連続絵付シートＳは、例えば図２に示す層構造を有している。即ち、ＰＥＴからなる厚さ３８μｍの基体シート３１の上面に界面活性剤からなる帯電防止層３２が形成され、基体シート３１の下面にアクリルメラミン系の離型層３３が形成されている。この離型層３３の下面に絵柄Ｐの保護層をなす剥離層３４が形成され、この剥離層３４の下面に絵柄Ｐを含む絵柄層３５が形成され、絵柄層３５は接着剤層３６によって覆われている。
【００１３】
次に以上のように構成されている金型の成形動作を説明する。
雌型１と雄型２とが対向配置された間隙に絵付シートＳが挿入される。絵付シートＳには基準マーク（図示せず）が記され、図示しないセンサが基準マークを検知し、絵付シート位置調整装置（図示せず）が動作して成形・絵付の最適位置が選択される。
【００１４】
次いで雌型１が雄型２に押付けられ、キャビティＣが形成される。前記雌型１の押付けの際に、絵付シートＳは金型の上部において係合突起５と係合凹部２３に挟持され、金型の下部において係合突起６と係合凹部２４に挟持される。
【００１５】
この状態で雌型１に設けられたゲート４から射出樹脂が流し込まれると、射出樹脂は順次対向端面に向かって絵付シートＳを押付けながら流れていく。いま、係合突起と係合凹部が設けられていない場合には、成形時の絵付シートのシワは、絵付シート歪みの多いゲート位置から遠い位置程発生しやすい。即ち、ゲートから遠い程、絵付シートの歪みが蓄積し、シワが多くなる。従って、ゲートに近い位置に絵付シートの滑り止め（係合突起、係合凹部）を設けておけば、ゲートから近い位置は絵付シートのズレが少なくなる。即ち、ゲートからの遠近にかかわらず、ほぼ均等に絵付シートにシワが均等化され、シワが発生しにくくなる。
【００１６】
本実施例の金型１、２を用いて実際に製品を成形した結果と、従来例の金型を用いて成形した結果を示す。
（Ｉ）本実施例
絵付シートは図２に示した層構成のものを用い、成形ＡＳ樹脂は旭化成製のスタイラックＡＳクリアであり、成形圧力は２５０ｔであり、転写時絵付シートは連続ロール送りとした。
【００１７】
１００ショット成形した結果は、絵付シートの送り方向の位置ズレは標準位置に対して±０．２ｍｍであった。このように前記位置ズレが少なくなると、絵付シートのシワが少なくなり、成形品のシワが減る。
【００１８】
（ II ）比較例（１）
図１に示す金型において、係合突起５、６と係合凹部２３、２４の双方が形成されていない場合である。その他の条件は、本実施例と同一である。
【００１９】
１００ショット成形した結果は、絵付シートの送り方向の位置ズレは標準位置に対して±１．０ｍｍであった。
（ III ）比較例（２）
図１に示す金型で、係合突起を凹み面３の上辺の左端から右端まで設け、更に下辺の左端から右端まで設けた。その他の条件は、本実施例と同一である。
【００２０】
１００ショット成形した結果は、絵付シートの送り方向の位置ズレは標準位置に対して±０．２ｍｍであったが、図１に符号Ｄ１、Ｄ２に示す位置にシワが発生した。
【００２１】
【００２２】
また、本実施例では絵付シートとして転写式のものを用いたが、積層貼合わせ式のものにも適用できるのは勿論である。
【００２３】
【発明の効果】
以上説明したように本発明によれば、雄型と雌型とが当接される面に係合突起と係合凹部を設けて絵付シートを挟持するようにしたので、絵付シートの位置ズレが防止され、シワの発生を抑えることができる。
【図面の簡単な説明】
【図１】（Ａ）は本発明の実施例の雌型の斜視図、（Ｂ）は前記実施例の雄型の斜視図、（Ｃ）は雌型の１Ｃ−１Ｃ線に沿う断面図、（Ｄ）は雄型の１Ｄ−１Ｄ線に沿う断面図である。
【図２】本実施例に適用する絵付シートの層断面図である。
【図３】従来のインモールド射出成形同時絵付装置の概略構成図である。
【図４】従来の射出成形により作成された製品の斜視図である。
【図５】従来の雌型の斜視図である。
【図６】従来の金型の不都合を示す斜視図である。
【符号の説明】
１…雌型
２…雄型
３…凹み面（製品形成部）
４…ゲート
５、６…係合突起
２２…コア部（製品形成部）
２３、２４…係合凹部
Ｃ…キャビティ
Ｓ…絵付シート[0001]
[Industrial applications]
The present invention relates to a mold for simultaneous in-mold injection molding and painting for pressing a continuous painted sheet having a pattern against the inner wall of a cavity by an injection pressure and performing painting simultaneously with injection molding.
[0002]
[Prior art]
Generally, the in-mold injection molding simultaneous painting apparatus has a movable female mold 100 and a male mold 101 fixed opposite to the female mold 100 as shown in FIG. A continuous picture sheet S in which pictures are formed at a predetermined pitch between the sheets 101 runs between the supply roll 102 and the take-up roll 103. A pinch roller 104 is provided near the supply roll 102, and a sensor 105 for positioning the painting sheet S at a predetermined position in the cavity of the female mold 100 is provided below the pinch roller 104.
[0003]
In such an in-mold injection molding simultaneous painting apparatus, a plate-shaped product 106 as shown in FIG. 4 is formed, and a pattern P is formed on the upper painting surface of the product 106. In order to mold such a product 106, as shown in FIG. 5 , a female mold 100 in which a cavity 108 is formed is used. The male mold 101 is overlapped so that the painting sheet S is positioned on the inner wall side of the cavity 108. When the male mold 101 is ejected in this state, the continuous painting sheet S is pressed by the injection pressure, and the product 106 as shown in FIG. Is done.
[0004]
[Problems to be solved by the invention]
However, at the time of the above-mentioned injection molding, as shown in FIG. 6 , wrinkles W are formed at the corners of the cavity 108, or the wrinkles W are torn at those portions. Symbol g is a gate.
[0005]
In particular, when the cavity 108 has a secondary curved surface, a large area, or the like, the wrinkles and tears are apt to occur because the painted sheet S is remarkably stretched into a three-dimensional shape by the injection pressure.
Therefore, the present invention provides an in-mold injection-molding simultaneous painting metal member that can obtain a molded product (product) in which a wrinkle, a tear, or the like does not occur at the time of injection molding of a painted sheet and in which an accurate painted pattern is formed. The purpose is to provide a type.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention is directed to an in-mold in which an injection resin is poured from a gate in a state where a painting sheet is disposed between a female mold and a male mold disposed opposite to each other, and molding and painting are simultaneously performed by an injection pressure. In the injection molding simultaneous painting mold, the gate is a product forming portion of a cavity formed by the female mold and the male mold , and is a central portion in the vertical direction, and at a position other than the central portion in the horizontal direction, It is formed so as to have a perspective with respect to the outer peripheral portion , only in the vicinity of the gate on the outer peripheral portion of the product forming portion and only in the vertical upper and lower portions of the outer peripheral portion, one of the female type and the male type. An engagement protrusion for holding the painting sheet in cooperation is provided, and an engagement recess for engaging with the engagement protrusion is provided on the other.
[0007]
[Action]
According to the present invention, when the painted sheet is sandwiched between the molds so as to be able to be ejected, the painted sheet is firmly sandwiched between the engaging protrusions and the engaging concave portions, and the displacement of the painted sheet is reduced. On the other hand, at a position far from the gate, distortion of the painting sheet is originally accumulated at the time of injection, and wrinkles increase. On the other hand, at a position near the gate, the accumulation of the distortion is small, so that the occurrence of wrinkles is small. Therefore, at a position far from the gate, the painted sheet slightly slides due to clearance by the parting line, and wrinkles are reduced. Therefore, wrinkles at a position near and far from the gate can be balanced, and wrinkles are less likely to occur on the whole of the painted sheet.
[0008]
【Example】
Hereinafter, the present invention will be described based on the illustrated embodiments. FIG. 1 shows a perspective view and a sectional view of a mold according to the present embodiment.
[0009]
As shown in FIGS. 1A and 1B, the mold for simultaneous in-mold injection molding and painting according to the present invention comprises a movable female mold 1 and a fixed male arranged opposite to the female mold 1. Type 2 A continuous picture sheet S having a pattern formed between the two dies 1 and 2 is arranged so as to be able to run in the arrow Y direction.
[0010]
A flat concave surface 3 is formed in the female mold 1, and a gate 4 is formed at a central portion in the vertical direction of the concave surface 3 and slightly to the left in the horizontal direction. A semi-cylindrical engagement protrusion 5 made of urethane is provided on an upper flat portion on the front surface of the female mold 1, and a similar engagement protrusion 6 is provided on a lower flat portion of the female mold 1. The engaging projection 5 and 6, towards the height of the portion indicated by a symbol R 1 has formed a slightly raised tapered than the height of indicated at R 2. In addition, as the material of the engagement protrusions 5 and 6, silicon rubber, fluorine rubber, metal, or the like is preferable in addition to the urethane. The length of the engaging projections 5 and 6 is preferably 10 to 60% of the width of the product to be molded.
[0011]
A core portion 22 inserted into the concave surface 3 is formed on the front surface of the male mold 2, and a cavity C is formed by the core portion 22 and the concave surface 3 of the female mold 1. That is, the cavity C is formed by the concave surface 3 which is a product forming portion and the core portion 22. An engaging recess 23 is formed on the upper flat portion of the male mold 2 so as to engage with the engaging protrusion 5, and an engaging recess 23 is formed on the lower flat portion of the male mold 2 so as to engage with the engaging protrusion 6. A recess 24 is formed.
[0012]
The continuous painting sheet S has, for example, a layer structure shown in FIG. That is, an antistatic layer 32 made of a surfactant is formed on an upper surface of a base sheet 31 made of PET and having a thickness of 38 μm, and an acrylic melamine-based release layer 33 is formed on a lower surface of the base sheet 31. A release layer 34 serving as a protective layer for the pattern P is formed on the lower surface of the release layer 33, a pattern layer 35 including the pattern P is formed on the lower surface of the release layer 34, and the pattern layer 35 is covered with an adhesive layer 36. Has been done.
[0013]
Next, a description will be given of a molding operation of the mold configured as described above.
The painting sheet S is inserted into a gap where the female mold 1 and the male mold 2 are arranged to face each other. A reference mark (not shown) is written on the painting sheet S, and a sensor (not shown) detects the reference mark, and a painting sheet position adjusting device (not shown) operates to select an optimum position for forming and painting. .
[0014]
Next, the female mold 1 is pressed against the male mold 2 to form a cavity C. When the female mold 1 is pressed, the picture sheet S is sandwiched between the engagement protrusion 5 and the engagement recess 23 at the upper part of the mold, and is sandwiched between the engagement protrusion 6 and the engagement recess 24 at the lower part of the mold. .
[0015]
When the injection resin is poured from the gate 4 provided in the female mold 1 in this state, the injection resin flows while pressing the painting sheet S sequentially toward the opposite end surface. If the engaging projections and the engaging recesses are not provided, wrinkles of the painted sheet at the time of molding are more likely to occur at positions farther from the gate position where the painted sheet distortion is large. That is, the farther from the gate, the more the distortion of the painted sheet accumulates and the more wrinkles increase. Therefore, if the non-slip (engagement projections, engagement recesses) of the painting sheet is provided at a position near the gate, the displacement of the painting sheet at a position near the gate is reduced. That is, irrespective of the distance from the gate, the wrinkles are almost evenly distributed on the painting sheet, and wrinkles are less likely to occur.
[0016]
The result of actually molding a product using the molds 1 and 2 of the present example and the result of molding using the mold of the conventional example are shown.
(I) The present example The painted sheet used had the layer configuration shown in FIG. 2, the molded AS resin was Stylac AS Clear made by Asahi Kasei, the molding pressure was 250t, and the painted sheet at the time of transfer was used. Was a continuous roll feed.
[0017]
As a result of forming 100 shots, the positional deviation in the feed direction of the painted sheet was ± 0.2 mm with respect to the standard position. As described above, when the displacement is reduced, the wrinkles of the painted sheet are reduced, and the wrinkles of the molded product are reduced.
[0018]
( II ) Comparative example (1)
In the mold shown in FIG. 1, this is a case where both the engagement protrusions 5 and 6 and the engagement recesses 23 and 24 are not formed. Other conditions are the same as in the present embodiment.
[0019]
As a result of forming 100 shots, the positional deviation of the painted sheet in the feed direction was ± 1.0 mm with respect to the standard position.
( III ) Comparative example (2)
In the mold shown in FIG. 1, the engagement projection is provided from the left end to the right end of the upper side of the concave surface 3, and further provided from the left end to the right end of the lower side. Other conditions are the same as in the present embodiment.
[0020]
100 shots molded result, the feeding direction of the positional deviation of the decorative sheet has been a ± 0.2 mm with respect to the standard position, wrinkles occurred at the position indicated by reference numeral D 1, D 2 in FIG. 1.
[0021]
[0022]
In this embodiment, the transfer type is used as the painting sheet. However, it is needless to say that the present invention can be applied to a lamination type.
[0023]
【The invention's effect】
As described above, according to the present invention, the engaging projections and the engaging recesses are provided on the surface where the male mold and the female mold are in contact with each other so as to sandwich the picture sheet. This prevents the occurrence of wrinkles.
[Brief description of the drawings]
1A is a perspective view of a female mold of an embodiment of the present invention, FIG. 1B is a perspective view of a male mold of the embodiment, FIG. 1C is a cross-sectional view of the female mold taken along line 1C-1C, (D) is a sectional view taken along the male 1D-1D line.
FIG. 2 is a layer cross-sectional view of a painted sheet applied to the present embodiment.
FIG. 3 is a schematic configuration diagram of a conventional in-mold injection molding simultaneous painting apparatus.
FIG. 4 is a perspective view of a product made by conventional injection molding.
FIG. 5 is a perspective view of a conventional female mold.
FIG. 6 is a perspective view showing a disadvantage of a conventional mold.
[Explanation of symbols]
1 ... female mold 2 ... male mold 3 ... concave surface (product forming part)
4 gate 5, 6 engaging projection 22 core part (product forming part)
23, 24: engaging recess C: cavity S: sheet with picture

Claims (1)

対向配置された雌型と雄型との間に絵付シートを配置した状態でゲートから射出樹脂を流し込み、射出圧力により成形と絵付とを同時に行うインモールド射出成形同時絵付用金型において、
前記ゲートは前記雌型と雄型とで形成されるキャビティの製品形成部であって、縦方向中央部であり、かつ、横方向の中央部でない位置に、外周部に対して遠近を有するように形成されてなり、当該製品形成部の外周部の前記ゲートの近傍であって当該外周部の縦方向上下部にのみ、前記雌型と雄型の一方に前記絵付シートを協働して挟持する係合突起を設け、他方に前記係合突起と係合する係合凹部を設けたことを特徴とするインモールド射出成形同時絵付用金型。In a mold for in-mold injection molding simultaneous painting, in which an injection resin is poured from a gate in a state where a painting sheet is arranged between a female mold and a male mold arranged opposite to each other, and molding and painting are simultaneously performed by injection pressure,
The gate is a product forming portion of a cavity formed by the female mold and the male mold , and is located at a central portion in the vertical direction, and at a position other than the central portion in the horizontal direction, and has a distance to the outer peripheral portion. In the vicinity of the gate on the outer peripheral portion of the product forming portion and only in the vertical upper and lower portions of the outer peripheral portion, cooperatively holding the painted sheet by one of the female mold and the male mold. A mold for simultaneous painting with in-mold injection molding, characterized in that an engaging projection is provided, and an engaging recess is provided on the other.
JP26488191A 1991-10-14 1991-10-14 In-mold injection molding simultaneous painting mold Expired - Lifetime JP3558135B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP26488191A JP3558135B2 (en) 1991-10-14 1991-10-14 In-mold injection molding simultaneous painting mold

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP26488191A JP3558135B2 (en) 1991-10-14 1991-10-14 In-mold injection molding simultaneous painting mold

Publications (2)

Publication Number Publication Date
JPH0596574A JPH0596574A (en) 1993-04-20
JP3558135B2 true JP3558135B2 (en) 2004-08-25

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DE102011010971A1 (en) * 2011-02-10 2012-08-16 Leonhard Kurz Stiftung & Co. Kg Mold for injection molding a plastic film with a plastic melt

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