JP2001138334A - Mold and method for molding coat in mold - Google Patents
Mold and method for molding coat in moldInfo
- Publication number
- JP2001138334A JP2001138334A JP32683999A JP32683999A JP2001138334A JP 2001138334 A JP2001138334 A JP 2001138334A JP 32683999 A JP32683999 A JP 32683999A JP 32683999 A JP32683999 A JP 32683999A JP 2001138334 A JP2001138334 A JP 2001138334A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- cavity
- coating
- paint
- auxiliary
- 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.)
- Granted
Links
Classifications
-
- 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
- B29C45/16—Making multilayered or multicoloured articles
- B29C45/1679—Making multilayered or multicoloured articles applying surface layers onto injection-moulded substrates inside the mould cavity, e.g. in-mould coating [IMC]
-
- 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
- B29C45/1703—Introducing an auxiliary fluid into 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
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/18—Feeding the material into the injection moulding apparatus, i.e. feeding the non-plastified material into the injection unit
- B29C45/1816—Feeding auxiliary material, e.g. colouring material
-
- 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
- B29C45/26—Moulds
- B29C45/2669—Moulds with means for removing excess material, e.g. with overflow cavities
-
- 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
- B29C45/76—Measuring, controlling or regulating
- B29C45/7653—Measuring, controlling or regulating mould clamping forces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2101/00—Use of unspecified macromolecular compounds as moulding material
- B29K2101/12—Thermoplastic materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/0005—Condition, form or state of moulded material or of the material to be shaped containing compounding ingredients
- B29K2105/0032—Pigments, colouring agents or opacifiyng agents
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、金型内で成形した
樹脂成形品の表面と金型のキャビティ面との間にインジ
ェクタを用いて塗料を注入した後、塗料を金型内で硬化
させて、表面に塗膜が密着した一体型樹脂成形品を製造
するために用いられる金型内被覆成形用金型、及びこの
金型を用いた金型内被覆成形方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of injecting a paint between a surface of a resin molded product molded in a mold and a cavity surface of the mold using an injector, and then curing the paint in the mold. Further, the present invention relates to a mold for forming an in-mold coating used for producing an integrated resin molded product having a coating film adhered to the surface, and a method for forming an in-mold coating using the mold.
【０００２】[0002]
【従来の技術】自動車、家電、建材等に使用される樹脂
成形品の表面に塗装を施すことは、成形品に装飾性等の
付加価値を付けたり、或いは、耐候性を高めて製品の超
寿命化を計ることを目的として、従来から広く行われて
いる。このような塗装方法としてはスプレー塗装法が一
般的であるが、近年、環境問題に強い関心が寄せられる
中、各種工場からの有害有機物質の大気放出が厳しく制
限される傾向にあることや、従業者の健康保護を重視す
る観点から、スプレー塗装に代わる技術の開発が急務と
なっている。2. Description of the Related Art Coating the surface of a resin molded product used for automobiles, home appliances, building materials, etc., adds value to the molded product, such as decorativeness, or enhances the weather resistance of the product to enhance the product quality. It has been widely used for the purpose of extending the life. As such a coating method, a spray coating method is generally used.In recent years, while there has been a strong interest in environmental issues, the emission of harmful organic substances from various factories into the atmosphere tends to be severely restricted, From the viewpoint of emphasizing employee health protection, there is an urgent need to develop a technology that can replace spray painting.
【０００３】こうした中、金型内で成形した樹脂成形品
の表面と金型のキャビティ面との間に塗料を注入した
後、塗料を金型内で硬化させて樹脂成形品表面に塗膜が
密着した一体成形品を製造する金型内被覆成形方法（イ
ンモールドコーティング。以下「ＩＭＣ」という。）が
注目を集めている。このＩＭＣは、成形工程の省工程化
によるコストダウンにも大きく寄与すると期待されてい
る。Under these circumstances, after a paint is injected between the surface of the resin molded product molded in the mold and the cavity surface of the mold, the paint is cured in the mold to form a coating film on the surface of the resin molded product. Attention has been paid to an in-mold coating molding method (in-mold coating; hereinafter, referred to as "IMC") for producing a coherent integral molded product. This IMC is expected to greatly contribute to cost reduction by saving the molding process.
【０００４】[0004]
【発明が解決しようとする課題】このＩＭＣは、専らＳ
ＭＣ、ＢＭＣといった熱硬化性樹脂の成形品の製造を対
象に一部実施されているが、熱可塑性樹脂の射出成形に
おいては、まだ、広くは利用されていない。その大きな
理由の１つは、金型からの塗料漏れである。漏れた塗料
を拭き取って除去する等の作業は容易ではなく、また、
塗料漏れの度に装置を停止しなければならないので、成
形サイクルが長くなり、生産性が低下する問題を生ず
る。更に、漏れた塗料が金型の型締めに余計な負荷をか
け、所定の型締力がかからなくなったり、次サイクルの
成形品に付着する等、品質の維持にも問題を生ずる。The IMC is exclusively used for S
Although partly implemented for the production of molded products of thermosetting resins such as MC and BMC, they have not yet been widely used in injection molding of thermoplastic resins. One of the major reasons is paint leakage from the mold. Work such as wiping and removing leaked paint is not easy,
Since the apparatus must be stopped every time a paint leaks, a molding cycle is lengthened, which causes a problem that productivity is reduced. In addition, the leaked paint exerts an extra load on the mold clamping, causing a problem in maintaining the quality such that a predetermined clamping force is not applied or adheres to a molded product in the next cycle.
【０００５】そこで、このような塗料の漏れ対策とし
て、特開平６−３２８５０５号公報には、パーティング
面を有する金型を用いて射出成形を行うが、同時に金型
にシェアーエッジ部を形成し、このシェアーエッジ部で
塗料の漏れを防止するとした射出成形用金型が開示され
ている。しかしながら、完全には塗料の漏れを防止する
ことができないために、漏れた塗料を溜める空間を金型
に設けており、結果的に、シェアーエッジ部とこの空間
に溜まった塗料を除去する作業が必要となり、生産性を
低下させる原因となるものと考えられる。In order to prevent such paint leakage, Japanese Patent Application Laid-Open No. 6-328505 discloses that a mold having a parting surface is used for injection molding. At the same time, a shear edge is formed in the mold. In addition, there is disclosed an injection mold for preventing paint leakage at the shear edge portion. However, since it is not possible to completely prevent the paint from leaking, a space for storing the leaked paint is provided in the mold, and as a result, work to remove the shear edge portion and the paint that has accumulated in this space has been performed. It is considered necessary and may cause a decrease in productivity.
【０００６】また、特開平９−４８０４４号公報では、
パーティング面を有する金型であって、塗料の漏れを防
止するためにパーティング面に平行に補助キャビティが
形成された金型が開示されている。この金型を用いる場
合には、金型を締めた状態で塗料を注入する方法しか用
いることができない。In Japanese Patent Application Laid-Open No. 9-48044,
There is disclosed a mold having a parting surface, in which an auxiliary cavity is formed parallel to the parting surface to prevent paint leakage. When this mold is used, only a method of injecting paint with the mold closed can be used.
【０００７】また、同公報には、補助キャビティに更に
溝条を設けた金型が開示されているが、成形樹脂の固化
収縮により発生するクリアランス（溝条成形体と溝条の
部分における金型キャビティ面との隙間）を塗料が漏れ
ない程度にするなら、溝条の厚さを０．１〜０．５ｍｍ
程度とする必要がある。しかし、このような薄い溝条で
は、金型の動きに対する強度上の要請から、高さを十分
に取ることができず、金型を所定量開いて塗料を注入す
る場合には、塗料が漏れてしまうこととなる。また、も
し、型開き量よりも高い溝条とした場合であっても、強
度的に注入圧力に耐えられない。In this publication, there is disclosed a mold in which a groove is further provided in an auxiliary cavity. However, a clearance (a mold formed between a groove formed body and the groove) caused by solidification shrinkage of a molding resin is disclosed. If the gap between the cavity surface and the paint does not leak, the groove thickness should be 0.1 to 0.5 mm.
It is necessary to be about. However, with such a thin groove, the height cannot be sufficiently secured due to the demand for strength of the movement of the mold, and when the mold is opened by a predetermined amount and the paint is injected, the paint leaks. It will be. Further, even if the groove is larger than the mold opening, it cannot withstand the injection pressure in terms of strength.
【０００８】更に、特開平９−５２２６２号公報には、
溶融樹脂射出部の開口部（スプルー部）から離れた部分
に、スプルー部への塗料の流入を防止するための凹部が
形成された金型が開示されている。しかしながら、特開
平９−４８０４４号公報に開示の発明と同様に、金型を
所定量開いて塗料を注入する場合には、塗料漏れを防ぐ
効果は小さいものと考えられる。Further, Japanese Patent Application Laid-Open No. 9-52262 discloses that
There is disclosed a mold in which a concave portion for preventing the paint from flowing into the sprue portion is formed at a portion of the molten resin injection portion away from the opening (sprue portion). However, similarly to the invention disclosed in Japanese Patent Application Laid-Open No. 9-48044, when the mold is opened by a predetermined amount to inject paint, it is considered that the effect of preventing paint leakage is small.
【０００９】本発明は上述した従来技術の問題点に鑑み
てなされたものであり、その目的とするところは、塗料
の金型からの漏れを防止して、成形サイクルを短縮せし
めると共に品質の安定化を可能ならしめる金型内被覆成
形用金型と、この金型を用いた金型内被覆成形方法を提
供することにある。The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to prevent the paint from leaking from the mold, shorten the molding cycle, and stabilize the quality. It is an object of the present invention to provide a mold for forming a coating inside a mold, which enables the formation of a coating inside the mold, and a method for forming a coating inside the mold using the mold.
【００１０】[0010]
【課題を解決するための手段】即ち、本発明によれば、
金型を用いて成形された樹脂成形品の表面に、当該金型
内部において表面被覆を施すために、金型キャビティ内
に塗料を注入するためのインジェクタを備えた金型内被
覆成形用金型であって、当該金型の開閉方向に延在する
補助キャビティが、当該金型キャビティの全周にわたっ
て当該金型キャビティに連通して設けられていることを
特徴とする金型内被覆成形用金型、が提供される。ここ
で、補助キャビティの厚みは０．１〜２ｍｍの範囲と
し、かつ、長さは０．５〜３０ｍｍの範囲とすることが
好ましい。That is, according to the present invention,
In order to apply a surface coating to the surface of a resin molded product molded using a mold, the inside of the mold is provided with an injector for injecting a paint into a mold cavity. Wherein an auxiliary cavity extending in the opening and closing direction of the mold is provided so as to communicate with the mold cavity over the entire circumference of the mold cavity. Type is provided. Here, the thickness of the auxiliary cavity is preferably in the range of 0.1 to 2 mm, and the length is preferably in the range of 0.5 to 30 mm.
【００１１】このような本発明の金型は、シェアーエッ
ジ部を有し、補助キャビティがシェアーエッジ部に形成
されているシェアーエッジ型金型、及び、パーティング
面を有し、補助キャビティの長さ方向の一端がパーティ
ング面に接しているパーティング構造の金型のいずれに
も用いることができる。なお、補助キャビティの塗料注
入側キャビティ面を加熱するためにヒータを設けること
も好ましい。Such a mold of the present invention has a shear edge portion, an auxiliary cavity is formed at the shear edge portion, and a shear edge mold having a parting surface. It can be used for any mold having a parting structure in which one end in the vertical direction is in contact with the parting surface. In addition, it is preferable to provide a heater for heating the paint injection cavity surface of the auxiliary cavity.
【００１２】また、本発明によれば、金型を用いて成形
された樹脂成形品の表面に、当該金型内部において表面
被覆を施す為に、金型キャビティ内に塗料を注入するた
めのインジェクタを備え、当該金型キャビティの全周に
わたり、当該金型キャビティに連通するように補助キャ
ビティが形成された金型内被覆成形用金型を用いた金型
内被覆成形方法であって、当該補助キャビティ内に充填
された成型樹脂により補助成形体が形成され、当該補助
成形体の微小収縮によって当該補助成形体と当該補助キ
ャビティの金型表面との間に生ずる微小隙間により、当
該塗料の当該金型外への流出を防止することを特徴とす
る金型内被覆成形方法、が提供される。Further, according to the present invention, an injector for injecting a paint into a mold cavity in order to apply a surface coating to the surface of a resin molded product molded using the mold inside the mold. And a method for coating the inside of the mold using a mold for forming the inside of the mold, the auxiliary cavity being formed so as to communicate with the mold cavity over the entire circumference of the mold cavity. An auxiliary molded body is formed by the molding resin filled in the cavity, and a minute gap generated between the auxiliary molded body and the mold surface of the auxiliary cavity due to the minute shrinkage of the auxiliary molded body causes the metal of the paint to be formed. An in-mold coating forming method characterized by preventing outflow from the mold is provided.
【００１３】ここで、補助キャビティの塗料注入側キャ
ビティ面の表面温度を他の金型部分よりも高めて、金型
キャビティ面から拡がってきた塗料を補助キャビティ内
において硬化させ、塗料の金型外へ流出を防止すること
も好ましい。また、補助キャビティ内に成形樹脂が充填
されるように、金型の型締力を制御する、具体的には、
補助キャビティがない場合の成形圧力よりも高い圧力で
成形を行うことが好ましい。更に、所定の寸法の成形体
が得られる金型位置よりも、若干金型を開いた状態にお
いて、成形樹脂を前記金型キャビティ内に射出した後、
金型の型締力を高めて、補助キャビティ内に成形樹脂を
充填させる過程を含ませる方法も好適に用いられる。[0013] Here, the surface temperature of the cavity surface on the paint injection side of the auxiliary cavity is set higher than that of the other mold portion, and the paint spread from the mold cavity surface is cured in the auxiliary cavity, and the paint outside the mold is removed. It is also preferable to prevent outflow. Also, the mold clamping force of the mold is controlled so that the molding resin is filled in the auxiliary cavity. Specifically,
It is preferable to perform molding at a pressure higher than the molding pressure when there is no auxiliary cavity. Furthermore, after injecting molding resin into the mold cavity in a state in which the mold is slightly opened from a mold position at which a molded body of a predetermined size is obtained,
A method of increasing the mold clamping force of the mold so as to include a step of filling the auxiliary cavity with the molding resin is also preferably used.
【００１４】本発明の金型内被覆成形方法の好適な適用
例としては、自動車のバンパー、ドアミラーカバー、フ
ェンダ、ドアパネル、バックドアパネル、オーバーフェ
ンダ、ドアハンドル、サイドモール、サイドプロテク
タ、ホイルキャップ、二輪車のサイドカバー、カウルの
成形を挙げることができる。[0014] Preferable examples of the in-mold coating forming method of the present invention include a car bumper, a door mirror cover, a fender, a door panel, a back door panel, an over fender, a door handle, a side molding, a side protector, a wheel cap, and a motorcycle. Side cover and cowl molding.
【００１５】[0015]
【発明の実施の形態】以下、本発明に係る金型内被覆成
形用金型とそれを用いた金型内被覆成形方法（ＩＭＣ）
の実施の形態について、図面を参照しながら説明する
が、本発明が以下の実施の形態に限定されるものでない
ことはいうまでもない。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a mold for forming a coating in a mold according to the present invention and a method for forming a coating in a mold (IMC) using the same.
Embodiments will be described with reference to the drawings, but it goes without saying that the present invention is not limited to the following embodiments.
【００１６】図１（ａ）（左側図）は、本発明の金型内
被覆成形用金型（以下、「ＩＭＣ用金型」という。）の
一実施形態を示す断面図であり、型締め後の状態を示し
ている。ＩＭＣ用金型１０は、固定金型１１と可動金型
１２より構成され、両者はシェアーエッジ部１３により
摺り合わされ、金型キャビティ１４が形成される。固定
金型１１には溶融樹脂を射出するためにホットランナ１
５が備えられており、一方の可動金型１２には、ＩＭＣ
用金型１０を用いて成形された樹脂成形品の表面に、Ｉ
ＭＣ用金型１０内部において表面被覆を施すために、金
型キャビティ１４内に塗料を注入するためのインジェク
タ１６が備えられている。なお、図１（ａ）において、
可動金型１２の可動装置は図示していないが、可動金型
１２の開閉方向は、図１中の矢印Ｍで示される。FIG. 1A (left view) is a cross-sectional view showing an embodiment of a mold for forming a coating in a mold (hereinafter, referred to as "IMC mold") according to the present invention. The latter state is shown. The IMC mold 10 includes a fixed mold 11 and a movable mold 12, which are rubbed together by a shear edge portion 13 to form a mold cavity 14. The hot runner 1 is used to inject the molten resin into the fixed mold 11.
5 and one movable mold 12 has an IMC
The surface of the resin molded product molded by using the
An injector 16 for injecting paint into the mold cavity 14 is provided to apply a surface coating inside the MC mold 10. In FIG. 1A,
Although the movable device of the movable mold 12 is not shown, the opening and closing direction of the movable mold 12 is indicated by an arrow M in FIG.
【００１７】図１（ｂ）（右側図）は、シェアーエッジ
部１３の近傍、即ち、図１（ａ）中の記号Ａで示される
領域の拡大図である。補助キャビティ１７が、可動金型
１２の開閉方向に延在するように、かつ、金型キャビテ
ィ１４の全周にわたって金型キャビティ１４に連通して
設けられるように、固定金型１１のシェアーエッジ部１
３に加工が施されている。従って、補助キャビティ１７
内に充填された成形樹脂は、金型キャビティ１４内に充
填されて成形された成形品と一体的に「補助成形体」と
して形成されることとなる。FIG. 1B (right side view) is an enlarged view of the vicinity of the shear edge portion 13, that is, an area indicated by a symbol A in FIG. 1A. The shear edge portion of the fixed mold 11 is provided so that the auxiliary cavity 17 is provided so as to extend in the opening and closing direction of the movable mold 12 and communicates with the mold cavity 14 over the entire circumference of the mold cavity 14. 1
3 is processed. Therefore, the auxiliary cavity 17
The molding resin filled therein is formed as an “auxiliary molded body” integrally with a molded product filled and molded in the mold cavity 14.
【００１８】なお、後述する実施例に係る図３記載の金
型５０に示されるように、補助キャビティ１７は、樹脂
成形体の形状や成形樹脂のスプルー部の位置、インジェ
クタの位置を考慮して、可動金型におけるシェアーエッ
ジ部に加工を施すことにより、形成することも可能であ
る。つまり、どちらの金型が可動であるか固定であるか
によらず、金型を雄型と雌型とに分けたときには、雄型
のシェアーエッジ部に加工を施すことにより補助キャビ
ティを形成し、補助成形体を形成させればよい。なお、
雌雄の区別のつかない金型の場合には、塗装面ではない
金型の方に補助キャビティを形成すればよい。As shown in a mold 50 shown in FIG. 3 according to an embodiment to be described later, the auxiliary cavity 17 is formed in consideration of the shape of the resin molding, the position of the sprue portion of the molding resin, and the position of the injector. Alternatively, it can be formed by processing the shear edge portion of the movable mold. In other words, regardless of which mold is movable or fixed, when the mold is divided into a male mold and a female mold, the auxiliary cavity is formed by processing the shear edge of the male mold. , An auxiliary molded body may be formed. In addition,
In the case of a mold that cannot be distinguished between male and female, an auxiliary cavity may be formed in a mold that is not a painted surface.
【００１９】インジェクタ１６から塗料が注入された場
合には、例えば、可動金型１２を開かない場合であって
も、成形樹脂は固化によって収縮するので、塗料は可動
金型１２のキャビティ面と成形体との間を拡がり、シェ
アーエッジ部１３に到達する。塗料がシェアーエッジ部
１３から外部へ漏れ出す隙間は、金型キャビティ１４内
にある成形体、及び補助キャビティ１７内にある補助成
形体の厚み方向（図１では上下方向）の収縮によって生
ずる。また、塗料の注入圧を高くした場合には、固化し
た樹脂が圧縮されることによって収縮し、隙間が形成さ
れることもある。いずれにしても樹脂の収縮の大きさ
は、成形体の厚みに比例する。When the paint is injected from the injector 16, for example, even if the movable mold 12 is not opened, the molding resin shrinks due to solidification. It spreads between the body and reaches the shear edge portion 13. The gap where the paint leaks from the shear edge portion 13 to the outside is caused by contraction in the thickness direction (vertical direction in FIG. 1) of the molded body in the mold cavity 14 and the auxiliary molded body in the auxiliary cavity 17. Also, when the injection pressure of the paint is increased, the solidified resin is contracted by being compressed, and a gap may be formed. In any case, the degree of shrinkage of the resin is proportional to the thickness of the molded body.
【００２０】従って、補助キャビティ１７が形成されて
いない場合には、成形体の厚み方向の収縮が大きいため
に、塗料は、成形体と可動金型１２のキャビティ面との
間に生じた隙間を拡がった後、容易にシェアーエッジ部
１３へ流れ込み、外部へ流出することとなる。これは、
シェアーエッジ部１３は、所定の圧力下において、粘度
の高い成形樹脂は流出できないが、粘度の小さい塗料は
流出できる程度の隙間を有しているためである。Accordingly, when the auxiliary cavity 17 is not formed, the shrinkage in the thickness direction of the molded body is large, so that the paint causes a gap generated between the molded body and the cavity surface of the movable mold 12 to be formed. After spreading, it easily flows into the shear edge portion 13 and flows out. this is,
This is because the shear edge portion 13 has such a gap that a high-viscosity molding resin cannot flow out under a predetermined pressure, but a low-viscosity paint can flow out.
【００２１】一方、補助キャビティ１７が形成され、薄
い補助成形体が形成されている場合には、補助成形体の
厚み方向の収縮量の絶対値が小さくなることから、生ず
る隙間は塗料漏れを起こさない程度のものとなる。こう
して、塗料漏れを防止することが可能となる。このよう
な成形体及び補助成形体の収縮によって生ずる隙間は、
可動金型１２を若干開いて塗料を注入した場合であって
も、可動金型１２の開閉方向から明らかなように、変化
することはない。従って、本発明のＩＭＣ用金型１０を
用いた場合には、可動金型１２を型締めした状態、若干
開いた場合のいずれの場合であっても、塗料の注入、硬
化を行うことが可能である。On the other hand, when the auxiliary cavity 17 is formed and the thin auxiliary molded body is formed, the absolute value of the amount of shrinkage in the thickness direction of the auxiliary molded body becomes small, so that the resulting gap causes paint leakage. It will not be. Thus, paint leakage can be prevented. The gap caused by the shrinkage of such a molded article and the auxiliary molded article,
Even if the movable mold 12 is slightly opened and the paint is injected, there is no change as is apparent from the opening and closing direction of the movable mold 12. Therefore, when the IMC mold 10 of the present invention is used, it is possible to inject and cure the paint regardless of whether the movable mold 12 is closed or slightly opened. It is.
【００２２】補助キャビティ１７の厚みＤは０．１〜２
ｍｍの範囲とし、かつ、長さ（可動金型１２の開閉方向
における長さをいう。）Ｌは０．５〜３０ｍｍの範囲と
することが好ましい。厚みＤは薄すぎると成形樹脂の充
填、つまり補助成形体の形成が容易でなくなる問題が生
じ、一方、厚すぎると収縮によって生ずる隙間が広くな
るために、塗料の流れを防止する効果が無くなる。長さ
Ｌは短すぎると塗料の流出を防止する効果が小さく、一
方、長すぎると成形樹脂の完全は充填は困難となり、ま
た、原料を浪費する問題が生ずる。The thickness D of the auxiliary cavity 17 is 0.1 to 2
mm, and the length (referred to as the length in the opening and closing direction of the movable mold 12) L is preferably in the range of 0.5 to 30 mm. If the thickness D is too small, there is a problem that the filling of the molding resin, that is, the formation of the auxiliary molded body, becomes difficult. On the other hand, if the thickness D is too large, the gap caused by shrinkage becomes large, and the effect of preventing the flow of the paint is lost. If the length L is too short, the effect of preventing the paint from flowing out is small. On the other hand, if the length L is too long, it becomes difficult to completely fill the molding resin, and there is a problem that the raw material is wasted.
【００２３】上述したシェアーエッジ型金型のＩＭＣ用
金型１０に限定されず、図２に示すように、固定金型２
１と可動金型２２からなり、パーティング面２３を有
し、補助キャビティ１７の長さ方向の一端がパーティン
グ面２３に接しているパーティング構造を有するＩＭＣ
用金型２０にも、本発明は適用される。図２は、型締め
された状態を示しているが、厚みの薄い補助キャビティ
１７に充填された成形樹脂は、厚み方向の収縮量が小さ
いために、塗料はパーティング面２３へ流出することな
く、補助キャビティ１７の部分において硬化することと
なる。The present invention is not limited to the above-mentioned shear-edge type die 10 for IMC, and as shown in FIG.
1 and a movable mold 22, having a parting surface 23, and having a parting structure in which one end of the auxiliary cavity 17 in the longitudinal direction is in contact with the parting surface 23.
The present invention is also applied to the mold 20. FIG. 2 shows a state in which the mold is clamped. However, since the molding resin filled in the thin auxiliary cavity 17 has a small amount of shrinkage in the thickness direction, the paint does not flow out to the parting surface 23. , At the portion of the auxiliary cavity 17.
【００２４】さて、ＩＭＣ用金型１０・２０（以下、
「ＩＭＣ金型１０等」という。）において、補助キャビ
ティ１７における塗料の硬化を促し、金型外への塗料流
出の防止をより確実に行うために、図１・２に示したよ
うに、補助キャビティ１７の塗料注入側キャビティ面、
即ち、補助キャビティ１７において塗料が流入する可動
金型１２・２２側の表面を部分的に高温に保持するため
に、ヒータ３１を設け、加熱ブロック３２を形成するこ
とも好ましい。この場合、熱硬化性の塗料が補助キャビ
ティ１７に形成された補助成形体と加熱ブロック３２と
の間の隙間を流れる際に、熱硬化性の塗料の粘度が上が
り、硬化が促進されて、金型外への流出がより確実に防
止されるようになる。Now, the IMC molds 10 and 20 (hereinafter, referred to as IMC dies)
It is called "IMC mold 10 etc." 1), in order to promote the curing of the paint in the auxiliary cavity 17 and to more reliably prevent the paint from flowing out of the mold, as shown in FIGS.
That is, it is also preferable to provide a heater 31 and form a heating block 32 in order to partially maintain the surface of the movable molds 12 and 22 into which the paint flows in the auxiliary cavity 17 at a high temperature. In this case, when the thermosetting coating material flows through the gap between the auxiliary molded body formed in the auxiliary cavity 17 and the heating block 32, the viscosity of the thermosetting coating material increases, and the curing is accelerated. Outflow from the mold is more reliably prevented.
【００２５】なお、ＩＭＣ用金型１０等を用いた場合に
は、樹脂成形品には常に不要である補助成形体が形成さ
れることとなるため、成形後に補助成形体を除去する工
程が必要となる。しかしながら、この補助成形体を取る
工程が増えた場合であっても、射出成形の時点で塗料漏
れが発生し、逐次金型等の清掃や手入れを行うことによ
って成形サイクルが長くなり、また、不規則になって品
質も一定しない状況と比較すると、本発明のＩＭＣ用金
型１０等を用いることにより、生産性は著しく向上し、
また、品質も安定するという顕著な効果が得られる。When the IMC mold 10 or the like is used, an unnecessary auxiliary molded body is always formed on the resin molded product, so that a step of removing the auxiliary molded body after molding is necessary. Becomes However, even if the number of steps of taking the auxiliary molded body increases, paint leakage occurs at the time of injection molding, and the molding cycle becomes longer due to successive cleaning and care of the mold and the like. Compared to the situation where the quality is not regulated and the quality is not constant, the productivity is remarkably improved by using the IMC mold 10 and the like of the present invention,
In addition, a remarkable effect that the quality is stabilized can be obtained.
【００２６】次に、上述した本発明のＩＭＣ用金型を用
いた金型内被覆成形方法（ＩＭＣ）の好適な条件につい
て説明する。上述した通り、本発明のＩＭＣは、補助キ
ャビティ内に充填された成形樹脂により補助成形体が形
成され、この補助成形体の微小収縮によって補助成形体
と補助キャビティの金型表面との間に生ずる微小隙間に
より、塗料の金型外への流出を防止するものである。Next, preferred conditions of the in-mold coating forming method (IMC) using the above-described IMC mold of the present invention will be described. As described above, in the IMC of the present invention, an auxiliary molded body is formed by the molding resin filled in the auxiliary cavity, and is generated between the auxiliary molded body and the mold surface of the auxiliary cavity due to the minute shrinkage of the auxiliary molded body. The minute gap prevents the paint from flowing out of the mold.
【００２７】ここで、本発明のＩＭＣは、従来のＩＭＣ
を行わない射出成形やＩＭＣを行う射出成形の工程をほ
ぼ踏襲し、一部に条件の改変を加えたものである。成形
樹脂の射出から成形品の取り出しに至る工程について
は、後述する実施例において詳細に説明することとし、
以下、塗料の漏れを防止する観点から、本発明のＩＭＣ
に特徴的な技術について説明する。Here, the IMC of the present invention is a conventional IMC.
The process substantially follows the steps of injection molding that does not perform IMC and injection molding that performs IMC, and some of the conditions are modified. The process from injection of the molding resin to removal of the molded product will be described in detail in Examples described later.
Hereinafter, from the viewpoint of preventing paint leakage, the IMC of the present invention
A characteristic technique will be described.
【００２８】塗料の漏れを防止する観点から、本発明の
ＩＭＣにおいては、補助キャビティの塗料注入側キャビ
ティ面の表面温度を他の金型部分よりも高めて、金型キ
ャビティ面から拡がってきた塗料を、補助キャビティ内
において硬化させる。このような金型内での温度分布を
設ける１つの方法が、先に図１・２に示したように、補
助キャビティの塗料注入側キャビティ面の金型表面近傍
にヒータを埋設して加熱ブロックを設け、温度制御を行
う方法である。この温度制御は、塗料の硬化条件（温
度、時間）と成形樹脂の熱可塑性を考慮して、適宜好適
な値とすればよい。From the viewpoint of preventing the leakage of paint, in the IMC of the present invention, the surface temperature of the paint injection side cavity surface of the auxiliary cavity is higher than that of the other mold parts, and the paint spread from the mold cavity surface. Is cured in the auxiliary cavity. One method of providing such a temperature distribution in the mold is to embed a heater near the mold surface on the paint injection side cavity surface of the auxiliary cavity as shown in FIGS. Is provided to perform temperature control. This temperature control may be appropriately set in consideration of the curing conditions (temperature and time) of the paint and the thermoplasticity of the molding resin.
【００２９】また、塗料の型外への漏れを防止するに
は、補助キャビティ内に成形樹脂を完全に充填させるこ
とが必要である。成形樹脂は粘度が高いことから、補助
キャビティ内に成形樹脂を完全に充填するためには、成
形樹脂が金型キャビティに充填される圧力よりも高い圧
力を溶融樹脂にかけることが好ましい。つまり、補助キ
ャビティが形成されていない金型を用いた場合に成形可
能な型締力よりも、高い型締力をかけ、その状態におい
て通常よりも高い射出充填圧で、補助キャビティに成形
樹脂を充填するよう、型締力を制御することが好まし
い。In order to prevent the paint from leaking out of the mold, it is necessary to completely fill the auxiliary cavity with the molding resin. Since the molding resin has a high viscosity, in order to completely fill the molding resin into the auxiliary cavity, it is preferable to apply a pressure higher than the pressure at which the molding resin is filled into the mold cavity to the molten resin. In other words, a mold clamping force higher than the mold clamping force that can be molded when using a mold having no auxiliary cavity is used, and in that state, the molding resin is injected into the auxiliary cavity with a higher injection filling pressure than usual. It is preferable to control the mold clamping force so as to fill.
【００３０】具体的には、金型を成形品が得られる所定
位置にセットした状態で、樹脂の射出圧力を上げる方法
が挙げられるが、好ましくは、所定の寸法の成形体が得
られる金型位置よりも、若干金型を開いた状態におい
て、成形樹脂を金型キャビティ内に射出した後、可動金
型を移動させて金型の型締力を高め、補助キャビティ内
に成形樹脂を充填させる方法が用いられる。Specifically, there is a method in which the injection pressure of the resin is increased in a state where the mold is set at a predetermined position where a molded product can be obtained. After injecting the molding resin into the mold cavity with the mold slightly opened from the position, the movable mold is moved to increase the mold clamping force of the mold, and the molding resin is filled into the auxiliary cavity. A method is used.
【００３１】本発明のＩＭＣは、射出成形機の構造、特
に可動金型の位置制御機構に依存することなく用いるこ
とができる。つまり、可動金型を油圧シリンダーや電磁
シリンダーによって直接に動かして位置や型締力を制御
する射出成形機、或いは油圧シリンダーや電磁シリンダ
ーを用いたトグル式射出成形機等を用いて、本発明を実
施することが可能である。The IMC of the present invention can be used without depending on the structure of the injection molding machine, especially the position control mechanism of the movable mold. In other words, the present invention is implemented using an injection molding machine that directly moves the movable mold by a hydraulic cylinder or an electromagnetic cylinder to control the position and the clamping force, or a toggle injection molding machine using a hydraulic cylinder or an electromagnetic cylinder. It is possible to implement.
【００３２】ところで、本発明のＩＭＣの適用範囲、つ
まり製品範囲に限定がないことはいうまでもないが、好
適な適用例としては、自動車のバンパー、ドアミラーカ
バー、フェンダ、ドアパネル、バックドアパネル、オー
バーフェンダ、ドアハンドル、サイドモール、サイドプ
ロテクタ、ホイルキャップ、二輪車のサイドカバー、カ
ウルの成形を挙げることができる。Incidentally, it is needless to say that the application range of the IMC of the present invention, that is, the product range is not limited, but preferable application examples are a vehicle bumper, a door mirror cover, a fender, a door panel, a back door panel, and an over door. Examples include fenders, door handles, side moldings, side protectors, wheel caps, motorcycle side covers, and cowl molding.
【００３３】また、本発明に適用される成形樹脂（熱可
塑性樹脂）にも限定はなく、例えば、ポリエチレン、ポ
リプロピレン、エチレン−酢酸ビニルポリマーといった
ポリオレフィン樹脂、ポリビニルアルコール等の結晶性
汎用樹脂、ポリアミド、ポリエチレンテレフタレート、
ポリアセタール等の結晶性エンジニアリングプラスチッ
ク、ポリ塩化ビニル、ポリ塩化ビニリデン、ＡＢＳ樹
脂、ＡＣＳ樹脂、ＰＭＭＡ樹脂等の非晶性汎用樹脂、ポ
リカーボネート、変性ＰＰＯ、ポリイミド、ポリアリレ
ート、ポリエーテルイミド等の非晶性エンジニアリング
プラスチック、その他、ポリスチレン樹脂、熱可塑性エ
ラストマー等が挙げられ、これらは混合して用いること
も可能である。また、熱可塑性を維持する範囲で上述し
た各種の熱可塑性樹脂に他の成分、例えば、ポリウレタ
ン樹脂、フェノール樹脂、メラミン樹脂、エポキシ樹脂
等の熱硬化性樹脂を混合したものを用いることもでき
る。更に、これらの各種材料にカーボン繊維やガラス繊
維等の各種繊維を添加した複合材料を用いることも可能
である。The molding resin (thermoplastic resin) applied to the present invention is not limited. For example, polyolefin resins such as polyethylene, polypropylene and ethylene-vinyl acetate polymer, crystalline general-purpose resins such as polyvinyl alcohol, polyamide, polyethylene terephthalate,
Crystalline engineering plastics such as polyacetal, amorphous general-purpose resins such as polyvinyl chloride, polyvinylidene chloride, ABS resin, ACS resin and PMMA resin, and amorphous materials such as polycarbonate, modified PPO, polyimide, polyarylate and polyetherimide Examples include engineering plastics, polystyrene resins, and thermoplastic elastomers, and these can be used in combination. In addition, a mixture of the above-described various thermoplastic resins and other components, for example, a thermosetting resin such as a polyurethane resin, a phenol resin, a melamine resin, and an epoxy resin can be used as long as the thermoplasticity is maintained. Further, a composite material obtained by adding various fibers such as carbon fiber and glass fiber to these various materials can be used.
【００３４】また、塗料としては、アルキド樹脂系、エ
ポキシ樹脂エステル系、脂肪酸変性ウレタン樹脂系等の
酸化重合型塗料、エポキシ樹脂系、ポリウレタン系、不
飽和ポリエステル系等の多液反応型塗料、アルキド樹脂
系、エポキシ樹脂系、ポリウレタン系、ビニル樹脂系等
の熱硬化型塗料、エポキシアクリレートオリゴマー、ウ
レタンアクリレートオリゴマー、ポリエステルアクリレ
ートオリゴマー、これら各種オリゴマーとエチレン性不
飽和モノマーからなるラジカル重合型塗料、或いはこれ
らの塗料に金属粉や顔料、紫外線吸収剤等を添加した機
能性塗料、フッ素樹脂系ラッカー、シリコン樹脂系ラッ
カー、シラン系ハードコート剤等を用いることができ
る。Examples of the coating material include oxidized polymerization type coating materials such as alkyd resin type, epoxy resin ester type and fatty acid modified urethane resin type, multi-component reaction type coating materials such as epoxy resin type, polyurethane type and unsaturated polyester type, and alkyd type. Resin-based, epoxy-based, polyurethane-based, vinyl-based thermosetting paints, epoxy acrylate oligomers, urethane acrylate oligomers, polyester acrylate oligomers, radical polymerization paints composed of these various oligomers and ethylenically unsaturated monomers, or Functional paints obtained by adding metal powders, pigments, ultraviolet absorbers, and the like to the above paints, fluororesin lacquers, silicone resin lacquers, silane hard coat agents, and the like can be used.
【００３５】[0035]
【実施例】以下、本発明の実施例について説明するが、
以下の実施例が本発明を限定するものでないことはいう
までもない。縦３００ｍｍ、横２１０ｍｍ、深さ５０ｍ
ｍの箱状製品が得られるシェアーエッジ構造の金型であ
って、所定用の塗料を注入できるインジェクタを備えた
金型と、型締力を任意に変えることができるトグル型締
め方式の３５０ｔ射出成形機を用い、ＡＢＳ樹脂を射出
成形した後に金型内に表１に示す成分を有する塗料を注
入することで、樹脂成形品の表面に塗膜を一体的に形成
した。Hereinafter, embodiments of the present invention will be described.
It goes without saying that the following examples do not limit the present invention. Height 300mm, width 210mm, depth 50m
m having a shear-edge structure to obtain a box-shaped product having a m-shaped product, provided with an injector capable of injecting a predetermined paint, and a toggle-clamp-type 350t injection capable of arbitrarily changing a mold clamping force. Using a molding machine, a coating having the components shown in Table 1 was injected into the mold after injection molding of the ABS resin, whereby a coating film was integrally formed on the surface of the resin molded product.
【００３６】[0036]
【表１】 [Table 1]
【００３７】ここで、実施例に係る金型の概略構造は図
３に示す通りであり、ＩＭＣ用金型５０は、樹脂を射出
するためのスプルー部５４と塗料を注入するためのイン
ジェクタ１６並びに加熱ブロック３２を備えた固定金型
５１と、補助キャビティ１７が形成されるように加工が
施された可動金型５２からなり、金型キャビティ内に形
成される製品部分４３に一体的に補助成形体４４が形成
される構造となっている。Here, the schematic structure of the mold according to the embodiment is as shown in FIG. 3, and the IMC mold 50 includes a sprue 54 for injecting resin, an injector 16 for injecting paint, and A fixed mold 51 having a heating block 32 and a movable mold 52 machined so as to form the auxiliary cavity 17 are integrally formed with a product portion 43 formed in the mold cavity. The structure is such that the body 44 is formed.
【００３８】補助キャビティ１７は、金型キャビティの
全周にわたって金型キャビティに連通するように長さ１
０ｍｍ、厚み０．３ｍｍとなるように形成されている。
但し、後述するように、補助キャビティ１７には、加工
精度上の問題からコーナー部において最大０．６ｍｍの
厚みを有する部分があった。また、補助キャビティ１７
の長さについての加工精度は、±０．２ｍｍの範囲に納
められていた。The auxiliary cavity 17 has a length of 1 so as to communicate with the mold cavity over the entire circumference of the mold cavity.
It is formed to have a thickness of 0 mm and a thickness of 0.3 mm.
However, as described later, the auxiliary cavity 17 had a portion having a maximum thickness of 0.6 mm at a corner portion due to a problem in processing accuracy. In addition, the auxiliary cavity 17
The machining accuracy for the length was within a range of ± 0.2 mm.
【００３９】一方、比較例に係る金型６０は図４に示す
通りであり、その固定金型は、図３に示したＩＭＣ用金
型５０の固定金型５１と同じものである。そして、可動
金型６２は従来のシェアーエッジを有するものであり、
補助キャビティは形成されていない。On the other hand, the mold 60 according to the comparative example is as shown in FIG. 4, and the fixed mold is the same as the fixed mold 51 of the IMC mold 50 shown in FIG. The movable mold 62 has a conventional shear edge.
No auxiliary cavity is formed.
【００４０】実施例に係るＩＭＣ用金型５０を用いて、
先ず、型閉じの完了状態よりも２０ｍｍほど型を開けた
状態に保持して、金型キャビティと補助キャビティ１７
を完全に充填できるだけの量の溶融したＡＢＳ樹脂（宇
部サイコン（株）社製ＭＸ４０）を射出した。この射出
に要した時間は２秒であった。この直後、固定金型５１
と可動金型５２を閉じ、型締力３５０ｔをかけ、樹脂を
冷却硬化させるために２０秒保持した。冷却完了後に可
動金型５２と固定金型５１との間を１ｍｍ開けて塗膜形
成に十分な量の塗料を注入し、その後素早く型を閉じ、
５０ｔの型締力で１秒間保持した後、型締力を２０ｔま
で下げ、１５０秒間保持した。塗料の注入完了から型締
力増加そして低型締力到達までの時間は２秒であった。
なお、塗料の硬化に際し、全体的な金型温度は９０℃と
したが加熱ブロック３２の温度は１２０℃とした。Using the IMC mold 50 according to the embodiment,
First, the mold is held in an opened state by about 20 mm from the completed state of the mold closing, and the mold cavity and the auxiliary cavity 17 are opened.
The molten ABS resin (MX40, manufactured by Ube Sycon Co., Ltd.) was injected in such an amount that the resin could be completely filled. The time required for this injection was 2 seconds. Immediately after this, the fixed mold 51
And the movable mold 52 were closed, a mold clamping force of 350 t was applied, and the resin was held for 20 seconds to cool and cure the resin. After cooling is completed, the space between the movable mold 52 and the fixed mold 51 is opened by 1 mm, a sufficient amount of paint is injected for forming a coating film, and then the mold is closed quickly.
After holding for 1 second with a mold clamping force of 50t, the mold clamping force was lowered to 20t and held for 150 seconds. The time from the completion of the injection of the paint to the increase in the clamping force and the achievement of the low clamping force was 2 seconds.
When the paint was cured, the overall mold temperature was 90 ° C., but the temperature of the heating block 32 was 120 ° C.
【００４１】一方、比較例に係るＩＭＣ用金型６０を用
いて、同様の条件で成形体を作製した。加熱ブロック３
２の温度を１２０℃とし、その他の金型部分は全体的に
９０℃に保持された状態で試験された。On the other hand, using the IMC mold 60 according to the comparative example, a molded article was produced under the same conditions. Heating block 3
The temperature of No. 2 was 120 ° C., and the other mold parts were tested while being kept at 90 ° C. overall.
【００４２】塗料硬化後に金型を開けて成形品を取り出
し、塗料の拡がり具合、型外への塗料漏れを検査した。
図５は、実施例に係るＩＭＣ用金型５０を用いて作製さ
れた成形品４０の説明図であり、図中の断面Ｂは成形品
４０の側面部における断面図を示し、また、コーナー部
の塗膜４２の形成状態を拡大して示した。成形品４０は
成形樹脂部分４１と塗膜４２からなり、成形樹脂部分４
１は製品部分４３と補助成形体４４から構成されてい
る。図５に示されるように、成形品４０に形成された補
助成形体４４の部分で塗料が止まり、型外への塗料漏れ
は観察されなかった。また、補助成形体４４のコーナー
部は厚みが０．６ｍｍと厚くなっており、他の部分より
も塗料が深く流れていたが、型外へ流出することはなか
った。After the paint was cured, the mold was opened and the molded product was taken out. The spread of the paint and the leakage of the paint out of the mold were inspected.
FIG. 5 is an explanatory view of a molded product 40 manufactured by using the IMC mold 50 according to the example. A cross section B in the drawing shows a cross-sectional view of a side surface of the molded product 40, and a corner portion. The state of formation of the coating film 42 of FIG. The molded article 40 comprises a molded resin part 41 and a coating film 42,
1 comprises a product part 43 and an auxiliary molded body 44. As shown in FIG. 5, the paint stopped at the portion of the auxiliary molded body 44 formed on the molded article 40, and no paint leakage outside the mold was observed. The corner portion of the auxiliary molded body 44 had a thickness as large as 0.6 mm, and the paint flowed deeper than other portions, but did not flow out of the mold.
【００４３】なお、実施例に係る同ＩＭＣ用金型５０を
用い、かつ、加熱ブロック３２の温度を９０℃と他の金
型部分と同じとして成形体を作製したところ、補助成形
体が厚いコーナー部でのみ塗料漏れが観察された。従っ
て、補助キャビティの加工精度を考慮して、補助キャビ
ティが厚く形成されてしまった部分については塗料の硬
化温度を上げるか、或いは補助キャビティの長さを塗料
漏れが起こらない程度に長くする等の対策を施せばよ
く、一方、補助キャビティの加工精度が良好である場合
には、加熱ブロックを設ける必要もないことがわかる。When a molded article was produced using the same IMC mold 50 according to the example and the temperature of the heating block 32 being 90 ° C., which was the same as the other mold parts, the auxiliary molded article was found to have thick corners. Paint leakage was observed only in the part. Therefore, in consideration of the processing accuracy of the auxiliary cavity, in the portion where the auxiliary cavity is formed thick, the curing temperature of the paint is increased, or the length of the auxiliary cavity is increased so that the paint does not leak. It can be seen that a countermeasure may be taken, but if the processing accuracy of the auxiliary cavity is good, it is not necessary to provide a heating block.
【００４４】一方、比較例に係るＩＭＣ用金型６０を用
いた場合には、加熱ブロック３２の温度を１２０℃とし
ても、シェアーエッジ部からの塗料漏れが観察され、漏
れた塗料を拭き取る必要が生じた。前述したＩＭＣ用金
型５０を用いて加熱ブロック３２の温度を変えて試験し
た結果を考慮すると、比較例のＩＭＣ用金型６０を用い
て、しかも加熱ブロック３２の温度を他の金型部分と同
じ９０℃とすると、加熱ブロック３２を１２０℃とした
場合よりもより多くの塗料漏れが生ずることが予想さ
れ、また、実際に試験により塗料漏れが確認された。On the other hand, when the IMC mold 60 according to the comparative example is used, even if the temperature of the heating block 32 is set to 120 ° C., paint leakage from the shear edge portion is observed, and it is necessary to wipe off the leaked paint. occured. Considering the results of the test performed by changing the temperature of the heating block 32 using the IMC mold 50 described above, the temperature of the heating block 32 was set to be different from that of the other mold parts by using the IMC mold 60 of the comparative example. At the same 90 ° C., it is expected that more paint leakage will occur than when the heating block 32 is set at 120 ° C. Further, paint leakage was actually confirmed by the test.
【００４５】[0045]
【発明の効果】上述の通り、本発明の金型内被覆成形用
金型とこの金型を用いた金型内被覆成形方法によれば、
型外への塗料漏れが防止されることから、成形サイクル
を一定として生産性を向上させ、また、品質を一定に維
持できるという極めて顕著な効果が得られる。この効果
は、成形品に一体的に形成される補助成形体の部分の除
去という工程が増えることのマイナスの効果よりも遙か
に大きい効果である。As described above, according to the mold for mold-in-mold coating of the present invention and the mold-in-mold-coating molding method using this mold,
Since the paint is prevented from leaking out of the mold, a very remarkable effect that the productivity can be improved by keeping the molding cycle constant and the quality can be kept constant can be obtained. This effect is much larger than the negative effect of increasing the number of steps of removing the part of the auxiliary molded body formed integrally with the molded article.
【図１】 本発明の金型内被覆成形用金型の一実施形態
を示す断面図である。FIG. 1 is a cross-sectional view showing an embodiment of a mold for coating in a mold according to the present invention.
【図２】 本発明の金型内被覆成形用金型の別の実施形
態を示す断面図である。FIG. 2 is a cross-sectional view showing another embodiment of the mold for coating in a mold according to the present invention.
【図３】 本発明の金型内被覆成形用金型の更に別の実
施形態を示す断面図である。FIG. 3 is a cross-sectional view showing still another embodiment of the mold for coating in a mold of the present invention.
【図４】 従来の金型内被覆成形用金型の一実施形態を
示す断面図である。FIG. 4 is a cross-sectional view showing one embodiment of a conventional die for coating in a die.
【図５】 本発明の金型内被覆成形用金型を用いて作製
した実施例に係る成形体を示す説明図である。FIG. 5 is an explanatory view showing a molded body according to an example manufactured using the mold for coating in a mold of the present invention.
１０…金型内被覆成形用金型（ＩＭＣ用金型）、１１…
固定金型、１２…可動金型、１３…シェアーエッジ部、
１４…金型キャビティ、１５…ホットランナ、１６…イ
ンジェクタ、１７…補助キャビティ、２０…ＩＭＣ用金
型、２１…固定金型、２２…可動金型、３１…ヒータ、
３２…ヒータブロック、４０…成形品、４１…成形樹脂
部分、４２……塗膜、４３…製品部分、４４…補助成形
体、５０…ＩＭＣ用金型、５１…固定金型、５２…可動
金型、５４…スプルー部、６０…ＩＭＣ用金型（従来
例）、６２…可動金型。10: mold for coating in-mold coating (mold for IMC), 11 ...
Fixed mold, 12: movable mold, 13: shear edge part,
14 mold cavity, 15 hot runner, 16 injector, 17 auxiliary cavity, 20 mold for IMC, 21 fixed mold, 22 movable mold, 31 heater
32: heater block, 40: molded product, 41: molded resin part, 42: coating film, 43: product part, 44: auxiliary molded body, 50: die for IMC, 51: fixed die, 52: movable die Mold, 54: sprue part, 60: mold for IMC (conventional example), 62: movable mold.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 岡原 悦雄 山口県宇部市大字小串字沖の山1980番地 宇部興産株式会社高分子研究所内 (72)発明者 小林 和明 山口県宇部市大字小串字沖の山1980番地 宇部興産株式会社高分子研究所内 (72)発明者 米持 建司 愛知県小牧市三ツ渕字西ノ門878番地 大 日本塗料株式会社小牧工場内 (72)発明者 大田 賢治 愛知県小牧市三ツ渕字西ノ門878番地 大 日本塗料株式会社小牧工場内 Ｆターム(参考） 4F202 AK09 AM32 CA11 CB01 CB22 CB28 CK06 CK27 CN18 CN21 4F206 AK09 AM32 JA07 JB22 JB28 JF06 JM16 JQ81 JQ87 JW50 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Etsuo Okahara 1980 Yamaguchi Prefecture Ube City, Ogishi-Kogushi-ji, offshore Polymer Research Laboratory Ube Industries, Ltd. (72) Inventor Kazuaki Kobayashi, Ube City, Yamaguchi Prefecture, Ogashi-Kagashi-Okiyama 1980 Ube Industries, Ltd.Polymer Research Laboratory (72) Inventor Kenji Yonemochi 878 Nishinomon, Mitsubuchi, Komaki City, Aichi Prefecture Dai Nippon Paint Co., Ltd.Komaki Plant (72) Inventor Kenji Ota Mitsuchi, Nishibuchi, Komaki City, Aichi Prefecture No.878 Nomon F Co., Ltd. Komaki Factory F term (reference) 4F202 AK09 AM32 CA11 CB01 CB22 CB28 CK06 CK27 CN18 CN21 4F206 AK09 AM32 JA07 JB22 JB28 JF06 JM16 JQ81 JQ87 JW50
Claims (10)
面に、当該金型内部において表面被覆を施すために、金
型キャビティ内に塗料を注入するためのインジェクタを
備えた金型内被覆成形用金型であって、 当該金型の開閉方向に延在する補助キャビティが、当該
金型キャビティの全周にわたって当該金型キャビティに
連通して設けられていることを特徴とする金型内被覆成
形用金型。1. A mold provided with an injector for injecting a paint into a mold cavity in order to apply a surface coating to the surface of a resin molded product molded using the mold inside the mold. A mold for coating molding, wherein an auxiliary cavity extending in the opening and closing direction of the mold is provided to communicate with the mold cavity over the entire circumference of the mold cavity. Mold for inner coating molding.
ｍｍの範囲にあり、かつ、長さが０．５〜３０ｍｍの範
囲にあることを特徴とする請求項１記載の金型内被覆成
形用金型。2. The thickness of the auxiliary cavity is 0.1 to 2
The coating mold according to claim 1, wherein the length is in the range of 0.5 to 30 mm.
ビティが当該シェアーエッジ部に形成されていることを
特徴とする請求項１又は２記載の金型内被覆成形用金
型。3. The mold according to claim 1, further comprising a shear edge portion, wherein the auxiliary cavity is formed in the shear edge portion.
ティの長さ方向の一端が当該パーティング面に接してい
ることを特徴とする請求項１又は２記載の金型内被覆成
形用金型。4. The mold according to claim 1, further comprising a parting surface, wherein one end of the auxiliary cavity in a longitudinal direction is in contact with the parting surface. .
ティ面を加熱するためにヒータが設けられていることを
特徴とする請求項１〜４のいずれか一項に記載の金型内
被覆成形用金型。5. The metal mold for coating in a mold according to claim 1, wherein a heater is provided for heating a surface of the auxiliary cavity on a paint injection side. Type.
面に、当該金型内部において表面被覆を施すために、金
型キャビティ内に塗料を注入するためのインジェクタを
備え、当該金型キャビティの全周にわたり、当該金型キ
ャビティに連通するように補助キャビティが形成された
金型内被覆成形用金型を用いた金型内被覆成形方法であ
って、 当該補助キャビティ内に充填された成形樹脂により補助
成形体が形成され、当該補助成形体の微小収縮によって
当該補助成形体と当該補助キャビティの金型表面との間
に生ずる微小隙間により、当該塗料の当該金型外への流
出を防止することを特徴とする金型内被覆成形方法。6. An injector for injecting a paint into a mold cavity for applying a surface coating to the surface of a resin molded product molded using the mold inside the mold, the mold comprising: An in-mold coating forming method using an in-mold coating forming mold in which an auxiliary cavity is formed so as to communicate with the mold cavity over the entire circumference of the cavity, wherein the auxiliary cavity is filled. An auxiliary molded body is formed from the molding resin, and the paint flows out of the mold by a minute gap generated between the auxiliary molded body and the mold surface of the auxiliary cavity due to the minute shrinkage of the auxiliary molded body. A method for forming a coating in a mold, characterized in that the coating is prevented.
ティ面の表面温度を他の金型部分よりも高めて、前記金
型キャビティ面から拡がってきた塗料を当該補助キャビ
ティ内において硬化させ、当該塗料の金型外へ流出を防
止することを特徴とする金型内被覆成形方法。7. The surface temperature of the paint injection side cavity surface of the auxiliary cavity is higher than that of another mold portion, and the paint spread from the mold cavity surface is cured in the auxiliary cavity, and the paint An in-mold coating forming method characterized by preventing outflow from the mold.
されるように、金型の型締力を制御することを特徴とす
る請求項６又は７記載の金型内被覆成形方法。8. The method according to claim 6, wherein the mold clamping force of the mold is controlled such that the molding resin is filled in the auxiliary cavity.
開いた状態において、成形樹脂を前記金型キャビティ内
に射出した後、金型の型締力を高めて、前記補助キャビ
ティ内に当該成形樹脂を充填させる過程を含ませたこと
を特徴とする請求項６〜８のいずれか一項に記載の金型
内被覆成形方法。9. A mold is stopped before completion of mold clamping, and in a state where the mold is opened, a molding resin is injected into the mold cavity. 9. The method according to any one of claims 6 to 8, further comprising a step of filling the inside with the molding resin.
ー、フェンダ、ドアパネル、バックドアパネル、オーバ
ーフェンダ、ドアハンドル、サイドモール、サイドプロ
テクタ、ホイルキャップ、二輪車のサイドカバー、カウ
ルの成形に用いられることを特徴とする請求項６〜９の
いずれか一項に記載の金型内被覆成形方法。10. It is used for molding a bumper, a door mirror cover, a fender, a door panel, a back door panel, an over fender, a door handle, a side molding, a side protector, a wheel cap, a motorcycle side cover, and a cowl of an automobile. The method of forming a coating in a mold according to claim 6.
Priority Applications (9)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32683999A JP3820332B2 (en) | 1999-11-17 | 1999-11-17 | Mold for in-mold coating molding and in-mold coating molding method |
| KR1020027000417A KR20020026948A (en) | 1999-07-27 | 2000-07-17 | Method of forming coating on inner surfaces of metal mold |
| EP00946363A EP1207031A4 (en) | 1999-07-27 | 2000-07-17 | Method of forming coating on inner surfaces of metal mold |
| CA002380088A CA2380088C (en) | 1999-07-27 | 2000-07-17 | Method of forming a coating layer on the surface of a molded product within a mold |
| PCT/JP2000/004779 WO2001007230A1 (en) | 1999-07-27 | 2000-07-17 | Method of forming coating on inner surfaces of metal mold |
| TW089114815A TW482716B (en) | 1999-07-27 | 2000-07-25 | Method and device for forming coating on the inner surfaces of a mold |
| US11/280,267 US7832999B2 (en) | 1999-07-27 | 2005-11-17 | Method of forming a coating layer on the surface of a molded product within a mold |
| KR1020060056660A KR100704406B1 (en) | 1999-11-17 | 2006-06-23 | In-mold coating formation mold and in-mold coating formation method utilizing said mold |
| US12/285,441 US7837918B2 (en) | 1999-07-27 | 2008-10-06 | Method of forming a coating layer on the surface of a molded product within a mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32683999A JP3820332B2 (en) | 1999-11-17 | 1999-11-17 | Mold for in-mold coating molding and in-mold coating molding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001138334A true JP2001138334A (en) | 2001-05-22 |
| JP3820332B2 JP3820332B2 (en) | 2006-09-13 |
Family
ID=18192296
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32683999A Expired - Lifetime JP3820332B2 (en) | 1999-07-27 | 1999-11-17 | Mold for in-mold coating molding and in-mold coating molding method |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP3820332B2 (en) |
| KR (1) | KR100704406B1 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003009985A1 (en) * | 2001-07-24 | 2003-02-06 | Ube Machinery Corporation, Ltd. | Internally coated mold, and internal mold coating forming method |
| WO2006070813A1 (en) * | 2004-12-28 | 2006-07-06 | Rimtec Corporation | Mold, in-mold coating method and formed article with coating |
| JP2006264066A (en) * | 2005-03-23 | 2006-10-05 | Aisin Seiki Co Ltd | In-mold coating/molding method, molding, and mold |
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| JP2008279763A (en) * | 2007-04-12 | 2008-11-20 | Japan Steel Works Ltd:The | Manufacturing method of molded article with coating film in mold, and mold for manufacture |
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| JP4973552B2 (en) | 2008-03-14 | 2012-07-11 | クラウスマッファイ テヒノロギース ゲゼルシャフト ミット ベシュレンクテル ハフツング | Mold for coating in-mold product and method for coating in-mold product |
| JP7004342B2 (en) * | 2020-04-15 | 2022-01-21 | 株式会社岐阜多田精機 | Painted coating molded product |
| JP6999968B2 (en) * | 2020-04-15 | 2022-01-19 | 株式会社岐阜多田精機 | Painted coating molded product |
| JP7004341B2 (en) * | 2020-04-15 | 2022-01-21 | 株式会社岐阜多田精機 | Painted coating molded product |
| JP7025049B2 (en) * | 2020-04-15 | 2022-02-24 | 株式会社岐阜多田精機 | Painted coating molded product |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62134223A (en) * | 1985-12-07 | 1987-06-17 | Agency Of Ind Science & Technol | Liquid resin sealing mechanism |
| JP2968150B2 (en) * | 1993-05-18 | 1999-10-25 | 東京電力株式会社 | Busbar connection device |
| JPH0948044A (en) * | 1995-08-07 | 1997-02-18 | Dainippon Toryo Co Ltd | Mold for in-mold-coating molding and method for in-mold-coating |
-
1999
- 1999-11-17 JP JP32683999A patent/JP3820332B2/en not_active Expired - Lifetime
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| WO2003009985A1 (en) * | 2001-07-24 | 2003-02-06 | Ube Machinery Corporation, Ltd. | Internally coated mold, and internal mold coating forming method |
| CN1328031C (en) * | 2001-07-24 | 2007-07-25 | 宇部兴产机械株式会社 | Internally coated mold, and internal mold coating forming method |
| US7309221B2 (en) | 2001-07-24 | 2007-12-18 | Ube Machinery Corporation, Ltd. | Internally coated mold, and internal mold coating forming method |
| WO2006070813A1 (en) * | 2004-12-28 | 2006-07-06 | Rimtec Corporation | Mold, in-mold coating method and formed article with coating |
| JPWO2006070813A1 (en) * | 2004-12-28 | 2008-06-12 | Rimtec株式会社 | Mold, in-mold coating method, and molded product with coating |
| JP4758911B2 (en) * | 2004-12-28 | 2011-08-31 | Ｒｉｍｔｅｃ株式会社 | Mold, in-mold coating method, and molded product with coating |
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| JP2008279763A (en) * | 2007-04-12 | 2008-11-20 | Japan Steel Works Ltd:The | Manufacturing method of molded article with coating film in mold, and mold for manufacture |
| JP2011500383A (en) * | 2007-10-25 | 2011-01-06 | エボニック レーム ゲゼルシャフト ミット ベシュレンクテル ハフツング | Method for producing coated molded product |
Also Published As
| Publication number | Publication date |
|---|---|
| KR100704406B1 (en) | 2007-04-09 |
| KR20060088515A (en) | 2006-08-04 |
| JP3820332B2 (en) | 2006-09-13 |
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