JPH05169486A - In-mold molding method - Google Patents
In-mold molding methodInfo
- Publication number
- JPH05169486A JPH05169486A JP33857191A JP33857191A JPH05169486A JP H05169486 A JPH05169486 A JP H05169486A JP 33857191 A JP33857191 A JP 33857191A JP 33857191 A JP33857191 A JP 33857191A JP H05169486 A JPH05169486 A JP H05169486A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- skin material
- molding method
- skin
- molten resin
- 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.)
- Pending
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
- B29C45/14—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
-
- 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
- B29C45/37—Mould cavity walls, i.e. the inner surface forming the mould cavity, e.g. linings
Landscapes
- 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)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、表皮材とこの表皮材の
裏面に一体に形成された肉部とからなる成形体を成形す
るインモールド成形方法の改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an in-mold molding method for molding a molded body composed of a skin material and a meat portion integrally formed on the back surface of the skin material.
【0002】[0002]
【従来の技術】従来、図5に示すように、表皮91a
と、この表皮91aの裏面側に一体に形成された発泡層
91bとからなる表皮材91を採用して成形体を製造す
るインモールド成形方法が知られている。表皮91aは
例えば塩化ビニルからなる。また、発泡層91bは例え
ばポリプロピレンフォームからなる。かかる表皮材91
は、上型92と上型93とからなる圧縮型90により形
成されるキャビティ94の第1型内面94aに対面して
配置される。そして、このキャビティ94内における表
皮材91の裏面と、第1型内面94aと対向する第2型
内面94bとの間に所定量の例えばポリプロピレンから
なる溶融樹脂95を射出し、圧縮型90の下型93を上
型92に近づけて圧縮成形する。こうして、溶融樹脂9
5を固化させて表皮材91の裏面に一体に肉部を形成
し、成形体を得る。2. Description of the Related Art Conventionally, as shown in FIG.
An in-mold molding method is known in which a molded body is manufactured by using a skin material 91 composed of a foam layer 91b integrally formed on the back surface side of the skin 91a. The skin 91a is made of vinyl chloride, for example. The foam layer 91b is made of polypropylene foam, for example. This skin material 91
Is arranged so as to face the first mold inner surface 94a of the cavity 94 formed by the compression mold 90 including the upper mold 92 and the upper mold 93. Then, a predetermined amount of molten resin 95 made of polypropylene, for example, is injected between the back surface of the skin material 91 in the cavity 94 and the second mold inner surface 94b facing the first mold inner surface 94a, and the lower part of the compression mold 90 is injected. The mold 93 is brought close to the upper mold 92 for compression molding. Thus, the molten resin 9
5 is solidified to integrally form a meat portion on the back surface of the skin material 91 to obtain a molded body.
【0003】[0003]
【発明が解決しようとする課題】しかし、従来のインモ
ールド成形方法では、第1型内面94aが平滑なもので
あったため、異なる方向に流動する溶融樹脂95によっ
て、図6に示すように、表皮材91が第1型内面94a
に対して滑り、これにより、図7に示すように、表皮材
91が延ばされて一部に重複部分91cを形成し、この
重複部分91cを溶融樹脂95からなる肉部によって一
体的に成形してしまう場合があった。この場合、成形品
は重複部分91cによってシワを生じて欠陥製品とな
る。また、かかる重複部分91cとこの重複部分91c
の裏面に一体に形成された肉部とが製品段階で打ち抜き
される部位であっても、表皮材91が重複部分91cを
形成することで他の部位に表皮材91が存在しない欠陥
製品を生じる。However, in the conventional in-mold molding method, since the inner surface 94a of the first mold is smooth, the molten resin 95 flowing in different directions causes the surface of the skin as shown in FIG. Material 91 is the first mold inner surface 94a
As a result, as shown in FIG. 7, the skin material 91 is extended to partially form an overlapping portion 91c, and the overlapping portion 91c is integrally formed by a meat portion made of the molten resin 95. There was a case to do. In this case, the molded product becomes a defective product due to wrinkles caused by the overlapping portion 91c. In addition, the overlapping portion 91c and the overlapping portion 91c
Even if the meat portion integrally formed on the back surface of the sheet is a portion that is punched out at the product stage, the skin material 91 forms the overlapping portion 91c, thereby producing a defective product in which the skin material 91 does not exist in other portions. ..
【0004】本発明は、上記従来の不具合に鑑みてなさ
れたものであって、成形段階で表皮材が重複部分を生じ
ることのないインモールド成形方法を提供することを目
的とする。The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide an in-mold molding method in which the skin material does not cause an overlapping portion at the molding stage.
【0005】[0005]
【課題を解決するための手段】本発明のインモールド成
形方法は、表皮材をキャビティの第1型内面に対面させ
て配置した後、該キャビティ内における該表皮材の裏面
と該第1型内面と対向する第2型内面との間に所定量の
溶融樹脂を射出し、該表皮材と該表皮材の裏面に一体に
形成された肉部とからなる成形体をインモールド成形す
るインモールド成形方法であって、前記第1型内面の少
なくとも一部が粗面となっていることを特徴とするもの
である。According to the in-mold molding method of the present invention, after the skin material is arranged facing the inner surface of the first mold of the cavity, the back surface of the skin material in the cavity and the inner surface of the first mold. In-mold molding for injecting a predetermined amount of molten resin between the inner surface of the second mold and the inner surface of the second mold, and in-molding a molded body including the skin material and a meat portion integrally formed on the back surface of the skin material. The method is characterized in that at least a part of the inner surface of the first mold is a rough surface.
【0006】第1型内面の粗面の位置は、異なる方向に
流動する溶融樹脂が衝突するウェルド部分等の特に応力
が大きくなる部位が好ましい。また、この位置は、粗面
が表皮材に転写されるのを避ける場合には、製品段階で
打ち抜かれる部位とすることができる。The position of the rough surface of the inner surface of the first mold is preferably a portion where the stress becomes particularly large, such as a weld portion where molten resin flowing in different directions collides. Further, this position can be a part punched out at the product stage when the transfer of the rough surface to the skin material is avoided.
【0007】[0007]
【作用】本発明のインモールド成形方法では、第1型内
面の少なくとも一部が粗面となっているため、表皮材と
第1型内面との間の摩擦力が強く、溶融樹脂の流動によ
っても表皮材が第1型内面に対して滑りにくい。このた
め、成形段階で表皮材は延ばされることがないため重複
部分を形成しない。In the in-mold molding method of the present invention, since at least a part of the inner surface of the first die is rough, the frictional force between the skin material and the inner surface of the first die is strong, and the flow of the molten resin causes The skin material does not easily slip on the inner surface of the first mold. For this reason, the skin material is not stretched at the molding stage, and thus the overlapping portion is not formed.
【0008】[0008]
【実施例】以下、本発明を具体化した実施例を図面を参
照しつつ説明する。まず、図1に示すように、表皮1a
と、この表皮1aの裏面側に一体に形成された発泡層1
bとからなる表皮材1を用意する。この表皮材1の表皮
1aは塩化ビニルからなり、この表皮1の発泡層1bは
ポリプロピレンフォームからなる。Embodiments of the present invention will be described below with reference to the drawings. First, as shown in FIG. 1, the epidermis 1a
And the foam layer 1 formed integrally on the back surface side of the skin 1a
A skin material 1 composed of b is prepared. The skin 1a of the skin material 1 is made of vinyl chloride, and the foam layer 1b of the skin 1 is made of polypropylene foam.
【0009】また、キャビティ4を形成する上型2と上
型3とからなる圧縮型10を用意する。上型2における
キャビティ4の第1型内面4aは、粗面が表皮材1に転
写されるのを避けるため、製品段階で打ち抜く部位が粗
面化されている。一方、下型3におけるキャビティ4の
第1型内面4aと対向する第2型内面4bは平滑であ
る。そして、表皮1aが第1型内面4aと当接する状態
で表皮材1を第1型内面4aに対面して配置する。Further, a compression mold 10 including an upper mold 2 and an upper mold 3 for forming a cavity 4 is prepared. The first die inner surface 4a of the cavity 4 of the upper die 2 has a roughened surface at the product stage in order to prevent the rough surface from being transferred to the skin material 1. On the other hand, the second die inner surface 4b of the lower die 3 that faces the first die inner surface 4a of the cavity 4 is smooth. Then, the skin material 1 is arranged to face the first mold inner surface 4a in a state where the skin 1a is in contact with the first mold inner surface 4a.
【0010】この後、キャビティ4内における表皮材1
の裏面と第2型内面4bとの間に所定量のポリプロピレ
ンからなる溶融樹脂5を射出する。そして、圧縮型10
の下型3を上型2に近づけ、圧縮成形する。このとき、
このインモールド成形方法では、第1型内面4aの一部
が粗面となっているため、表皮材1と第1型内面4aと
の間の摩擦力が強く、溶融樹脂5の流動によっても表皮
材1が第1型内面4aに対して滑りにくい。このため、
図2及び図3に示すように、成形段階で表皮材1は延ば
されることがなく、従来のような重複部分が形成されな
い。After this, the skin material 1 in the cavity 4
A predetermined amount of molten resin 5 made of polypropylene is injected between the back surface of the mold and the second mold inner surface 4b. And the compression mold 10
The lower mold 3 is brought close to the upper mold 2 and compression molded. At this time,
In this in-mold molding method, since a part of the inner surface 4a of the first mold is a rough surface, the frictional force between the skin material 1 and the inner surface 4a of the first mold is strong and even when the molten resin 5 flows, The material 1 is unlikely to slip on the inner surface 4a of the first mold. For this reason,
As shown in FIG. 2 and FIG. 3, the skin material 1 is not stretched during the molding step, and an overlapping portion as in the conventional case is not formed.
【0011】こうして、溶融樹脂5を固化させて表皮材
1の裏面に一体に肉部を形成し、インストルメントパネ
ル用成形体が得られる。このインストルメントパネル用
成形体は、図4に示すように、レジスタ部分7等を打ち
抜くことにより、インストルメントパネル6とされる。
したがって、このインモールド成形方法を採用すれば、
インストルメントパネル用成形体にシワが生じることが
なく、かつインストルメントパネル6には必ず表皮材1
が存在するため、欠陥製品を生じずに製品コストの低廉
化を実現することができる。In this way, the molten resin 5 is solidified to integrally form a flesh portion on the back surface of the skin material 1, and a molded body for an instrument panel is obtained. As shown in FIG. 4, this instrument panel molded body is made into an instrument panel 6 by punching out a register portion 7 and the like.
Therefore, if this in-mold molding method is adopted,
There is no wrinkle in the instrument panel molded body, and the instrument panel 6 always has the skin material 1
Therefore, it is possible to reduce the product cost without producing a defective product.
【0012】[0012]
【発明の効果】以上詳述したように、本発明のインモー
ルド成形方法では、少なくとも一部が粗面となっている
第1型内面を採用しているため、成形段階で表皮材が重
複部分を生じることがない。したがって、このインモー
ルド成形方法を採用すれば、成形体にシワが生じること
がなく、かつ製品の必要部位には必ず表皮材が存在する
ため、欠陥製品を生じずに製品コストの低廉化を実現す
ることができる。As described in detail above, in the in-mold molding method of the present invention, since the inner surface of the first mold, at least a part of which is rough, is used, the skin material overlaps at the molding stage. Does not occur. Therefore, if this in-mold molding method is adopted, wrinkles do not occur in the molded body, and since the skin material is always present in the necessary parts of the product, the product cost can be reduced without causing defective products. can do.
【図1】実施例を示す圧縮型の一部断面図である。FIG. 1 is a partial cross-sectional view of a compression mold showing an embodiment.
【図2】図1の状態後の実施例を示す圧縮型の一部断面
図である。FIG. 2 is a partial cross-sectional view of a compression mold showing an embodiment after the state of FIG.
【図3】図2の状態後の実施例を示す圧縮型の一部断面
図である。FIG. 3 is a partial cross-sectional view of a compression mold showing an embodiment after the state of FIG.
【図4】実施例で得た成形体による製品を示す斜視図で
ある。FIG. 4 is a perspective view showing a product made of the molded body obtained in the example.
【図5】従来例を示す圧縮型の一部断面図である。FIG. 5 is a partial cross-sectional view of a compression mold showing a conventional example.
【図6】図5の状態後の従来例を示す圧縮型の一部断面
図である。FIG. 6 is a partial cross-sectional view of a compression mold showing a conventional example after the state of FIG.
【図7】図6の状態後の従来例を示す圧縮型の一部断面
図である。FIG. 7 is a partial cross-sectional view of a compression mold showing a conventional example after the state of FIG.
1…表皮材 1a…表皮 1
b…発泡層 4…キャビティ 4a…第1型内面 4
b…第2型内面 5…溶融樹脂1 ... Epidermis 1a ... Epidermis 1
b ... Foam layer 4 ... Cavity 4a ... First mold inner surface 4
b ... second mold inner surface 5 ... molten resin
フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 FI 技術表示箇所 // B29K 105:20 B29L 9:00 4F (72)発明者 加藤 孝 愛知県西春日井郡春日町大字落合字長畑1 番地 豊田合成株式会社内 (72)発明者 伊藤 啓造 愛知県西春日井郡春日町大字落合字長畑1 番地 豊田合成株式会社内Continuation of front page (51) Int.Cl. 5 Identification number Reference number within the agency FI Technical indication location // B29K 105: 20 B29L 9:00 4F (72) Inventor Takashi Kato Ochiai, Nagahata, Kasuga-cho, Nishikasugai-gun, Aichi No. 1 in Toyoda Gosei Co., Ltd. (72) Inventor Keizo Ito 1 Ochiai, Nagahata, Kasuga-cho, Nishikasugai-gun, Aichi No. 1 in Toyoda Gosei Co., Ltd.
Claims (1)
せて配置した後、該キャビティ内における該表皮材の裏
面と該第1型内面と対向する第2型内面との間に所定量
の溶融樹脂を射出し、該表皮材と該表皮材の裏面に一体
に形成された肉部とからなる成形体をインモールド成形
するインモールド成形方法であって、 前記第1型内面の少なくとも一部が粗面となっているこ
とを特徴とするインモールド成形方法。1. A predetermined amount between a back surface of the skin material and a second mold inner surface facing the first mold inner surface in the cavity, after the skin material is arranged facing the first mold inner surface of the cavity. An in-mold molding method of injecting a molten resin of, and in-molding a molded body composed of the skin material and a meat portion integrally formed on the back surface of the skin material, wherein at least one of the inner surface of the first mold is An in-mold molding method, characterized in that the portion has a rough surface.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP33857191A JPH05169486A (en) | 1991-12-20 | 1991-12-20 | In-mold molding method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP33857191A JPH05169486A (en) | 1991-12-20 | 1991-12-20 | In-mold molding method |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH05169486A true JPH05169486A (en) | 1993-07-09 |
Family
ID=18319430
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP33857191A Pending JPH05169486A (en) | 1991-12-20 | 1991-12-20 | In-mold molding method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH05169486A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002086547A (en) * | 2000-09-20 | 2002-03-26 | Inoac Corp | Manufacturing method for hollow molded article having skin material integrated therewith, and blow mold used therefor |
JP2008296463A (en) * | 2007-05-31 | 2008-12-11 | Bridgestone Corp | Manufacturing apparatus of rubber crawler and manufacturing process of rubber crawler |
-
1991
- 1991-12-20 JP JP33857191A patent/JPH05169486A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002086547A (en) * | 2000-09-20 | 2002-03-26 | Inoac Corp | Manufacturing method for hollow molded article having skin material integrated therewith, and blow mold used therefor |
JP2008296463A (en) * | 2007-05-31 | 2008-12-11 | Bridgestone Corp | Manufacturing apparatus of rubber crawler and manufacturing process of rubber crawler |
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