JP2779347B2 - Injection molding method of molded article having concave part and pictured film on the surface - Google Patents
Injection molding method of molded article having concave part and pictured film on the surfaceInfo
- Publication number
- JP2779347B2 JP2779347B2 JP8205935A JP20593596A JP2779347B2 JP 2779347 B2 JP2779347 B2 JP 2779347B2 JP 8205935 A JP8205935 A JP 8205935A JP 20593596 A JP20593596 A JP 20593596A JP 2779347 B2 JP2779347 B2 JP 2779347B2
- Authority
- JP
- Japan
- Prior art keywords
- injection
- mold
- core
- film
- injection molding
- 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 - Lifetime
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/0772—Physical layout of the record carrier
- G06K19/07724—Physical layout of the record carrier the record carrier being at least partially made by a molding process
-
- 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
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
- B29C45/5675—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding for making orifices in or through the moulded article
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2017/00—Carriers for sound or information
- B29L2017/006—Memory cards, chip cards
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は、表面に凹部及び絵付き
フィルムを有する成形品の射出成形方法に関するもので
ある。
【０００２】
【従来の技術】従来、射出成形品、例えばカード等の板
状物にあって、その成形表面に凹部を設けたものは、し
ばしば利用されるが、このような成形品の射出成形に当
たっては、キャビティとコアとから形成される射出成形
型は、成形表面の凹部の成形に必要な突部が、予めコア
側の型面より内方に突設されているものであった。
【０００３】
【発明が解決しようとする問題点】上記のような従来の
射出成形にあっては、射出成形型内に、成形品の凹部を
形成するための突部が予め突設されているので、このよ
うな射出成形型内に溶融樹脂を射出すると、射出樹脂
は、型内において、型面側の表面に薄い被膜を生ずるも
のであるが、この薄い被膜は、型内の突部において両側
に分かれた後、突部を越えて再び一緒になる際、その合
わせ目は、元のような一様な膜とはならず、筋目状のウ
エルド部が形成され、成形型内の空気は、この部分に残
留する。
【０００４】したがって、成形品にも、板面の凹部に続
いて、筋目状のウエルド部が残る。
（第６図）
このような成形品の板面に筋目状のウエルド部が残るこ
とは、例えば成形品の板面に絵付きフィルムを埋め込む
ような場合において、絵付きフィルムと成形樹脂間にあ
るウエルド部の残留空気のため、絵付きフィルムは剥離
するおそれがあった。また筋目状のウエルド部のために
曲げ強度の低下とともに、外観的な見栄もよいものでは
なかった。
【０００５】
【問題点を解決するための手段】本発明は、このような
表面に凹部及び絵付きフィルムを有する成形品におい
て、この凹部に続いて生ずる筋目状のウエルド部を除去
して絵付きフィルムの剥離を防止するために、次のよう
な射出成形方法にて問題点の解決を図っている。すなわ
ち、本発明の表面に凹部及び絵付きフィルムを有する成
形品の射出成形方法としては、キャビティとコアとコア
側の型面と同一面にあるコア入子とで形成される射出成
形型に対して、前記射出成形型が形成される前に、前記
コア入子に続いて射出ゲートと反対側の前記コア側の型
面に絵付きフィルムを貼着しておき、射出された溶融樹
脂が型面側に薄い被膜を生じた後において、前記コア入
子を射出樹脂内に突出し、この後においても溶融樹脂の
射出を続けるという構成をとっている。
【０００６】
【実施例】以下、本発明の方法を実施するための装置を
図面に基づいて説明する。本発明の方法は、図５（イ）
及び（ロ）に示すような板状体の成形品（ｐ）及び
（ｐ’）のうち、その板面（１）に凹部（２）及び絵付
きフィルム（４）が形成されているようなものを射出成
形するためのものである。図５において、（３）は射出
ゲートであり、（２）は凹部、（４）は絵付きフィルム
である。図６に示すものは、従来の装置によって射出成
形された成形品（ｐ”）であって、板面（１’）の凹部
（２’）に続いて射出ゲート（３’）側と反対側にウエ
ルド部（ｗ）が形成されている。
【０００７】先ず、本発明の方法を実施するための装置
について説明すると、この装置は射出成形機に装着され
るもので、キャビティ（ａ）とコア（ｂ）とによって射
出成形型（ｓ）が形成される。コア（ｂ）側には射出成
形型（ｓ）内に突出自在なコア入子（ｃ）が設けられて
おり、このコア入子（ｃ）は、コア（ｂ）側に付設され
た油圧装置（ｄ）の圧油室（５）内を油圧にて摺動する
鍔部（６）に連結されている。コア入子（ｃ）の端面
（７）は、図１に示すように射出成形時に射出成形型
（ｓ）のコア（ｂ）側の型面（８）と一致するような平
面をなしており、コア入子（ｃ）は、油圧装置（ｄ）の
圧油室（５）内において、鍔部（６）の左右に交互に圧
油が導入されることにより、引込んだり、突出したりす
るようになっている。また、コア（ｂ）には、キャビテ
ィ（ａ）に対しての接合面に、溶融樹脂を射出成形型
（ｓ）内に射出するためのランナー（９）が穿設されて
いる。
【０００８】次に、本発明の方法を実施するための装置
を使用しての図５に示す射出成形品（ｐ）及び（ｐ’）
の成形について説明する。
図１に示すように、油圧装置（ｄ）の圧油室（５）
内の鍔部（６）の左側に圧油を導入して、コア入子
（ｃ）をその端面（７）が、射出成形型（ｓ）のコア
（ｂ）側の型面（８）と同一面になるように引込ませ
る。
溶融樹脂を、そのランナー（９）より射出成形型
（ｓ）内に射出する。このとき溶融樹脂は、成形型
（ｓ）の型面にそって流れ、その型面側の表面に薄い被
膜を生ずる。
この薄い被膜が生じたところで、図２に示すように
圧油室（５）の鍔部（６）の右側に圧油を導入して、コ
ア入子（ｃ）を成形型（ｓ）内に突出させ、溶融樹脂の
射出を続ける。この場合、溶融樹脂は、表面の薄膜に影
響を与えることなく成形型（ｓ）内に射出充填される。
射出成形が終わり一定時間後に、コア入子（ｃ）を
その端面（７）が成形型（ｓ）の型面（８）に一致する
位置まで後退させるとともに、コア（ｂ）を油圧装置
（ｄ）と共にキャビティ（ａ）面より引き離して、射出
成形品（ｐ）を取出す。この場合の射出成形品（ｐ）
は、凹部（２）に続いて射出ゲート（３）と反対側に、
図６に示すような筋目状のウエルド部を生ずることはな
い。
【０００９】本発明は、以上のような凹部（２）の形成
より、さらに進んで、図３及び図４に示すような、板面
一体化に凹部（２）と共に絵付きフィルム（４）を埋め
込む方法で、図５（ロ）に示すような射出成形品
（ｐ’）を成形する場合のものである。すなわち、油圧
装置（ｄ）と一体のコア（ｂ）をキャビティ（ａ）側に
押接して成形型（ｓ）を形成する前に、コア（ｂ）側の
型面（８）のコア入子（ｃ）に続いて射出ゲート（３）
と反対側に予め絵付きフィルム（４）を貼着しておき、
その後の射出成形においては、前記の図１及び図２ロの
場合となんら変わるところはない。この場合、成形型
（ｓ）の型面（８）に貼着した絵付きフィルム（４）は
薄いものであるから、溶融樹脂の射出時においても、筋
目状のウエルド部を形成する等のなんらの影響を与える
ことはなく、成形型（ｓ）内の空気は、成形型（ｓ）の
周囲に逃れるから、残留空気によって絵付きフィルム
（４）を剥離するようなおそれはない。
【００１０】これに対し、図６に示す従来のような凹部
（２’）を成形するための突部が、予め成形型（ｓ）内
に突設されているものであるならば、射出成形樹脂の流
れは、この突部において両側に分かれるため、型面側の
表面に形成された薄い被膜は、その後流れが一緒になっ
ても、薄膜の合わせ目は、一様な元の状態に戻らず、筋
目状のウエルド部を形成することから、この部分に成形
型（ｓ）内の空気が集中して残留し、貼着された絵付き
フィルム（４）上をウエルド部が通ることになるから、
残留空気のため、成形後において、埋め込まれた絵付き
フィルム（４）は剥離するおそれがある。
【００１１】
【発明の効果】本発明の方法は、表面に凹部及び絵付け
フィルムを有する射出成形品の成形に当たり、射出成形
型が形成された前に、コア入子に続いて射出ゲートと反
対側のコアの型面に絵付きフィルムを貼着しておき、型
を形成した後に、成形型内に溶融樹脂を射出し、その型
面側の表面に薄い被膜が形成された後において、この成
形型内に、成形品の凹部を成形するためのコア入子を突
出させるだけで、その後の連続した射出においても、従
来の射出成形型内に突部のあるものに射出する時のよう
に、突部による筋目状のウエルド部を形成することな
く、形成された薄い被膜面に影響を与えることかないか
ら、その表面が滑らかで外観的の見栄もよく、しかも曲
げに対しても強い凹部及び絵付きフィルムを有する成形
品を得ることができる。この際、絵付きフィルムと射出
成形樹脂との間に、ウエルド部に集中する空気の残留と
いうことがないから、成形後において、この絵付きフィ
ルムが剥離するというおそれはない。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for injection-molding a molded product having a concave portion and a picture-formed film on the surface. 2. Description of the Related Art Conventionally, injection molded articles, for example, plate-like articles such as cards, which have concave portions formed on the molding surface, are often used. In this case, the injection molding die formed from the cavity and the core has a projection necessary for molding the concave portion on the molding surface projecting inward from the mold surface on the core side in advance. [0003] In the conventional injection molding as described above, a projection for forming a concave portion of a molded product is previously provided in an injection molding die. Therefore, when a molten resin is injected into such an injection molding die, the injection resin forms a thin film on the surface of the die surface side in the die. After splitting on both sides, when joining again over the protrusion, the joint is not a uniform film like the original, a streak-like weld is formed, and the air in the mold is Remain in this part. [0004] Therefore, a strip-shaped welded portion remains in the molded product following the concave portion on the plate surface. (FIG. 6) The streak-like welded portions remaining on the plate surface of such a molded product are, for example, in the case where a painted film is embedded in the plate surface of a molded product, between the painted film and the molding resin. Because of the residual air in the welded portion, the picture-coated film was likely to be peeled off. In addition, due to the streak-like welded portions, the bending strength was lowered and the appearance was not good. SUMMARY OF THE INVENTION The present invention is directed to a molded article having a concave portion and a picture film on such a surface, by removing a streak-like weld portion following the concave portion to form a picture. In order to prevent peeling of the film, the following problems are solved by the following injection molding method. That is, as the injection molding method of the molded article having the concave portion and the picture-coated film on the surface of the present invention, an injection molding die formed by a cavity, a core, and a core insert on the same surface as the mold surface on the core side is used. Before the injection mold is formed, a pictorial film is pasted on the mold surface on the core side opposite to the injection gate following the core insert, and the injected molten resin is molded. After a thin film is formed on the surface side, the core insert is projected into the injection resin, and thereafter, the injection of the molten resin is continued. An apparatus for carrying out the method of the present invention will be described below with reference to the drawings. The method of the present invention is shown in FIG.
And (b) a molded product (p) or (p ′) of a plate-like body in which a concave portion (2) and a picture-coated film (4) are formed on its plate surface (1). It is for injection-molding things. In FIG. 5, (3) is an injection gate, (2) is a recess, and (4) is a picture film. FIG. 6 shows a molded product (p ″) injection-molded by a conventional apparatus, which is on the side opposite to the injection gate (3 ′) side following the concave portion (2 ′) of the plate surface (1 ′). First, an apparatus for carrying out the method of the present invention will be described. This apparatus is mounted on an injection molding machine, and includes a cavity (a) and a core. The core (b) is provided with a core insert (c) that can freely project into the injection mold (s) on the core (b) side. (C) is connected to a flange (6) that slides by hydraulic pressure in a pressure oil chamber (5) of a hydraulic device (d) attached to the core (b) side. The end face (7) of FIG. 1) is a plane which coincides with the mold face (8) on the core (b) side of the injection mold (s) at the time of injection molding as shown in FIG. The core insert (c) is retracted by the pressure oil being alternately introduced to the left and right of the flange (6) in the pressure oil chamber (5) of the hydraulic device (d). The core (b) has a runner (9) for injecting the molten resin into the injection mold (s) on the joint surface with the cavity (a). [0008] Next, the injection molded articles (p) and (p ') shown in Fig. 5 using the apparatus for carrying out the method of the present invention.
Will be described. As shown in FIG. 1, the pressure oil chamber (5) of the hydraulic device (d)
Pressurized oil is introduced to the left side of the inner flange portion (6), and the core insert (c) is brought into contact with the mold surface (8) on the core (b) side of the injection mold (s). Retract so that they are flush with each other. The molten resin is injected from the runner (9) into the injection mold (s). At this time, the molten resin flows along the mold surface of the molding die (s), and a thin film is formed on the surface on the mold surface side. When this thin film is formed, pressure oil is introduced to the right side of the flange portion (6) of the pressure oil chamber (5) as shown in FIG. 2, and the core insert (c) is placed in the mold (s). And eject the molten resin. In this case, the molten resin is injected and filled into the mold (s) without affecting the thin film on the surface. After a certain time after the end of the injection molding, the core insert (c) is retracted to a position where its end face (7) coincides with the mold face (8) of the mold (s), and the core (b) is moved to the hydraulic device (d). ) Together with the cavity (a) to take out the injection molded product (p). Injection molded product in this case (p)
Is on the side opposite to the injection gate (3) following the recess (2),
A streak-like weld portion as shown in FIG. 6 does not occur. The present invention goes further than the formation of the concave portion (2) as described above, and as shown in FIGS. This is a case where an injection molded product (p ′) as shown in FIG. That is, before the core (b) integral with the hydraulic device (d) is pressed against the cavity (a) side to form the molding die (s), the core insert of the mold surface (8) on the core (b) side is formed. (C) Following the injection gate (3)
Affixed the film with picture (4) on the opposite side in advance,
In the subsequent injection molding, there is no difference from the case of FIGS. 1 and 2B. In this case, since the picture-coated film (4) stuck to the mold surface (8) of the molding die (s) is thin, even when the molten resin is injected, it is necessary to form a streak-like welded portion. And the air in the mold (s) escapes around the mold (s), and there is no danger that the picture film (4) will be peeled off by the residual air. On the other hand, if the projection for forming the concave portion (2 ') as shown in FIG. 6 is formed in advance in the molding die (s), injection molding is performed. Since the resin flow splits on both sides at this protrusion, the thin film formed on the surface on the mold side will return to a uniform original state even if the flow subsequently merges. Instead, the streak-like welded portion is formed, so that the air in the molding die (s) is concentrated and remains at this portion, and the welded portion passes over the pasted pictured film (4). From
Due to residual air, the embedded picture film (4) may peel off after molding. The method of the present invention is used for molding an injection-molded article having a concave portion and a painting film on the surface thereof, before the injection mold is formed, after the core nesting, opposite to the injection gate. After attaching a picture film to the mold surface of the core on the side, forming the mold, injecting the molten resin into the mold, after forming a thin film on the surface of the mold side, this Just by protruding the core insert for molding the concave part of the molded product into the molding die, even in subsequent continuous injection, as in the case of injection into a conventional injection mold with a projection Since the projection does not form a streak-like welded portion and does not affect the formed thin film surface, the surface is smooth and has a good appearance, and the concave portion is strong against bending. Obtain a molded article with a pictured film Can be At this time, since there is no air remaining in the weld portion between the painted film and the injection molding resin, there is no danger that the painted film will peel off after molding.
【図面の簡単な説明】
【図１】本発明の方法の基礎となる方法による成形品の
製造工程を示す断面図である。
【図２】図１と同様にして製造工程の進んだ状態の断面
図である。
【図３】本発明の方法による図１と同じ状態の断面図で
ある。
【図４】本発明の方法による図２と同じ状態の断面図で
ある。
【図５】（イ）、（ロ）は本発明の基礎となる方法及び
本発明の方法により成形された成形品の斜視図である。
【図６】従来の方法により成形された成形品の斜視図で
ある。
【符号の説明】
ａ キャビティ
ｂ コア
ｃ コア入子
ｄ 油圧装置
ｐ、ｐ’、ｐ” 射出成形品
ｓ 射出成形型
ｗ ウエルド部
１ 板面
２ 凹部
３ ゲート
４ 絵付きフィルム
５ 圧油室
６ 鍔部
７ 端面
８ 型面
９ ランナーBRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a manufacturing process of a molded article by a method which is a basis of the method of the present invention. FIG. 2 is a cross-sectional view showing a state where a manufacturing process has proceeded in the same manner as in FIG. FIG. 3 is a cross-sectional view of the same state as in FIG. 1 according to the method of the present invention. FIG. 4 is a sectional view of the same state as in FIG. 2 according to the method of the present invention. 5 (a) and 5 (b) are perspective views of a method forming the basis of the present invention and a molded article formed by the method of the present invention. FIG. 6 is a perspective view of a molded product formed by a conventional method. [Description of Signs] a Cavity b Core c Core insert d Hydraulic device p, p ', p ″ Injection molded product s Injection mold w Weld part 1 Plate surface 2 Recess 3 Gate 4 Pictured film 5 Pressure oil chamber 6 Flange Part 7 End face 8 Mold face 9 Runner
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) B29C 45/14 B29C 45/56 B29C 33/76 B29C 45/26──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. 6 , DB name) B29C 45/14 B29C 45/56 B29C 33/76 B29C 45/26
Claims (1)
ア入子とで形成される射出成形型に対して、前記射出成
形型が形成される前に、前記コア入子に続いて射出ゲー
トと反対側の前記コア側の型面に絵付きフィルムを貼着
しておき、射出された溶融樹脂が型面側に薄い被膜を生
じた後において、前記コア入子を射出樹脂内に突出し、
この後においても溶融樹脂の射出を続けることを特徴と
する表面に凹部及び絵付きフィルムを有する成形品の射
出成形方法。(57) [Claims] The cavity, the core, and the core
Against the injection mold formed by the A nest, the injection molding
Before the mold is formed, the injection nesting follows the core nesting.
Paste a picture-coated film on the mold surface on the core side opposite to
; Then, after the injected molten resin is caused a thin film on the mold surface, projecting the core insert in the injected resin,
An injection molding method of a molded article having a concave portion and a picture- formed film on a surface, characterized by continuing injection of a molten resin even after this.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8205935A JP2779347B2 (en) | 1996-08-05 | 1996-08-05 | Injection molding method of molded article having concave part and pictured film on the surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8205935A JP2779347B2 (en) | 1996-08-05 | 1996-08-05 | Injection molding method of molded article having concave part and pictured film on the surface |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61167545A Division JPH0763983B2 (en) | 1986-07-16 | 1986-07-16 | Injection molding method and apparatus for molded article having concave portion on surface |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09104044A JPH09104044A (en) | 1997-04-22 |
| JP2779347B2 true JP2779347B2 (en) | 1998-07-23 |
Family
ID=16515173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8205935A Expired - Lifetime JP2779347B2 (en) | 1996-08-05 | 1996-08-05 | Injection molding method of molded article having concave part and pictured film on the surface |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2779347B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10238238A1 (en) * | 2002-08-21 | 2004-03-04 | Robert Bosch Gmbh | Injection molding assembly, for molding plastics radio keys, has a flow resistance into the molding cavity formed by flow brakes, to give the molten flow a predicted behavior |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2578719A (en) | 1944-06-14 | 1951-12-18 | Autograf Brush & Plastics Co I | Injection molding apparatus |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3284325B2 (en) * | 1993-08-26 | 2002-05-20 | セイコープレシジョン株式会社 | Camera ranging device |
-
1996
- 1996-08-05 JP JP8205935A patent/JP2779347B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2578719A (en) | 1944-06-14 | 1951-12-18 | Autograf Brush & Plastics Co I | Injection molding apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09104044A (en) | 1997-04-22 |
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Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19980407 |