JPH05169486A - In-mold molding method - Google Patents

In-mold molding method

Info

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
Application number
JP33857191A
Other languages
Japanese (ja)
Inventor
Hikari Ando
光 安藤
Shoji Sakaida
昭二 境田
Takashi Kato
孝 加藤
Keizo Ito
啓造 伊藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyoda Gosei Co Ltd
Original Assignee
Toyoda Gosei Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toyoda Gosei Co Ltd filed Critical Toyoda Gosei Co Ltd
Priority to JP33857191A priority Critical patent/JPH05169486A/en
Publication of JPH05169486A publication Critical patent/JPH05169486A/en
Pending legal-status Critical Current

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

PURPOSE:To offer a skin in-mold molding method by which an overlap of a skin material does not occur during molding stage. CONSTITUTION:A roughened surface is provided at least on a partial area in an inner face 4a of a first mold. Thereby, the friction force between a skin material 1 and the inner face 4a of the first mold is enhanced, keeping the skin material 1 from being slid along the inner face 4a of the first mold as a molten resin 5 flows. As a result, the skin material 1 is prevented from stretching and overlaping.

Description

【発明の詳細な説明】Detailed Description of the Invention

【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.

【図面の簡単な説明】[Brief description of drawings]

【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.

【符号の説明】[Explanation of symbols]

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)

【特許請求の範囲】[Claims] 【請求項１】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.
JP33857191A 1991-12-20 1991-12-20 In-mold molding method Pending JPH05169486A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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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