JPH0533130B2 - - Google Patents
Info
- Publication number
- JPH0533130B2 JPH0533130B2 JP24919584A JP24919584A JPH0533130B2 JP H0533130 B2 JPH0533130 B2 JP H0533130B2 JP 24919584 A JP24919584 A JP 24919584A JP 24919584 A JP24919584 A JP 24919584A JP H0533130 B2 JPH0533130 B2 JP H0533130B2
- Authority
- JP
- Japan
- Prior art keywords
- molding
- resin
- cushion material
- foam
- laminated
- 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
- 239000000463 material Substances 0.000 claims description 75
- 229920005989 resin Polymers 0.000 claims description 34
- 239000011347 resin Substances 0.000 claims description 34
- 239000006260 foam Substances 0.000 claims description 29
- 238000000465 moulding Methods 0.000 claims description 21
- 238000001746 injection moulding Methods 0.000 claims description 19
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 14
- 238000012360 testing method Methods 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 10
- 235000021189 garnishes Nutrition 0.000 description 10
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000004744 fabric Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 239000007924 injection Substances 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 238000010030 laminating Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229920000728 polyester Polymers 0.000 description 3
- -1 polypropylene Polymers 0.000 description 3
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 239000002174 Styrene-butadiene Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 239000011115 styrene butadiene Substances 0.000 description 2
- 229920005992 thermoplastic resin Polymers 0.000 description 2
- 239000005062 Polybutadiene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000002984 plastic foam Substances 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920005606 polypropylene copolymer Polymers 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000002759 woven fabric Substances 0.000 description 1
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
- B29C45/14778—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the article consisting of a material with particular properties, e.g. porous, brittle
- B29C45/14795—Porous or permeable material, e.g. foam
Description
【発明の詳細な説明】
＜産業上の利用分野＞
本発明は、自動車の内装材や天井材、および住
宅の装飾壁材等に広く利用されている表皮等と樹
脂の積層成形品の製造に有用な積層射出成形方法
に関する。[Detailed Description of the Invention] <Industrial Application Field> The present invention is applicable to the production of laminated molded products of skin and resin, which are widely used for interior materials and ceiling materials of automobiles, decorative wall materials of houses, etc. This invention relates to a useful laminated injection molding method.
＜従来の技術＞
従来より、表皮等と樹脂の積層成形品は、射出
成形法やホツトフロースタンピング法などによ
り、具体的には、表皮材またはこれとプラスチツ
クフオーム等の中間材を成形金型のキヤビテイに
収め、その後加熱溶融された熱可塑性樹脂を該キ
ヤビテイ内に射出するかまたは充填して、樹脂の
成形と同時に表皮材等と樹脂を接着し、積層する
方法などにより製造されている。<Conventional technology> Conventionally, laminated molded products of skin and resin have been produced by injection molding, hot flow stamping, etc., in which the skin material or an intermediate material such as plastic foam is placed in a mold. It is manufactured by placing the thermoplastic resin in a cavity, then injecting or filling the cavity with heated and melted thermoplastic resin, and simultaneously bonding and laminating the skin material and the resin while molding the resin.
＜発明が解決しようとする問題点＞
しかし、特公昭55−26972号公報等に記載され
ているように射出成形法によりこの種の積層成形
品を製作する場合、一般に射出成形では射出され
る溶融樹脂の内部圧力および温度が非常に高いた
め、たとえ表皮材に相当に弾力のある織布や不織
布を使用しても、成形工程において表皮材が弾力
を全く失なう程に圧縮あるいは溶融され易く、当
該成形品に、布としての手触りは残し得るが、ク
ツシヨン性を与えてさらに柔らかな触感を引き出
させることが非常に困難であつた。また、ウレタ
ンフオーム、ポリプロピレンフオームおよびポリ
エチレンフオーム等の高弾力の中間材を表皮材の
裏面に積層させて、射出成形しても、成形時これ
らフオームの全てまたは一部が溶融あるいは圧潰
され易いため、クツシヨン性を積層成形品に付与
することが困難であつた。<Problems to be Solved by the Invention> However, when producing this type of laminate molded product by injection molding as described in Japanese Patent Publication No. 55-26972, etc., generally speaking, in injection molding, the injected molten Because the internal pressure and temperature of the resin are extremely high, even if a highly elastic woven or nonwoven fabric is used as the skin material, the skin material is easily compressed or melted during the molding process to the point where it loses its elasticity. Although it is possible to retain the feel of cloth in the molded article, it is extremely difficult to impart cushioning properties and bring out a softer feel. Furthermore, even if highly elastic intermediate materials such as urethane foam, polypropylene foam, and polyethylene foam are laminated on the back side of the skin material and injection molded, all or part of these foams are likely to melt or be crushed during molding. It has been difficult to impart cushioning properties to laminated molded products.
本発明は、上記の事情を考慮してなされたもの
で、射出成形により表皮等を被覆した樹脂成形品
を製作する所謂インモールドプロセスにおいて、
成形品の表層部分が高いクツシヨン性を有し柔ら
かな弾力感を与えるように成形することができる
方法を提供することにある。 The present invention has been made in consideration of the above-mentioned circumstances, and is used in the so-called in-mold process for manufacturing resin molded products with a skin and the like covered by injection molding.
To provide a method capable of molding a molded article so that its surface layer has high cushioning properties and a soft elastic feel.
＜問題点を解決するための手段＞
本発明者等は、上記の目的を達成するべく、ク
ツシヨン材の種類や材質等について鋭意研究した
ところ、密度0.3ないし0.6ｇ／cm3、室温での反発
弾性率３％以下および独立気泡率80％以上のスチ
レン−ブタジエンゴム発泡体をクツシヨン材に使
用して、上述のように該クツシヨン材を表皮材の
裏面に積層させて射出成形すると、高いクツシヨ
ン性をそのまま保持した積層成形品が得られるこ
とを見い出して、本発明を完成させた。<Means for Solving the Problems> In order to achieve the above object, the inventors of the present invention conducted intensive research on the types and materials of cushion materials, and found that they have a density of 0.3 to 0.6 g/cm 3 and repulsion at room temperature. If a styrene-butadiene rubber foam with an elastic modulus of 3% or less and a closed cell ratio of 80% or more is used as a cushion material, and the cushion material is laminated on the back side of the skin material and injection molded as described above, high cushioning properties can be obtained. The present invention was completed by discovering that it is possible to obtain a laminate molded product that retains the same properties.
すなわち、本発明の積層射出成形方法は、表皮
材およびクツシヨン材を成形金型のキヤビテイに
重ねて収め、その後加熱溶融された樹脂基材を該
キヤビテイ内に射出注入して、前記表皮材、クツ
シヨン材および樹脂基材をこの順序に積層成形す
るにあたり、密度0.3ないし0.6ｇ／cm3室温での反
発弾性率３％以下、および独立気泡率80％以上の
スチレン−ブタジエンゴム発泡体を前記クツシヨ
ン材に使用したことを特等とするものである。 That is, in the laminated injection molding method of the present invention, a skin material and a cushion material are stacked and placed in a cavity of a molding die, and then a heated and melted resin base material is injected into the cavity to form the skin material and cushion material. When laminating and molding the cushion material and the resin base material in this order, a styrene-butadiene rubber foam having a density of 0.3 to 0.6 g/cm 3 and a rebound elasticity of 3% or less at room temperature and a closed cell ratio of 80% or more is used as the cushion material. It is specially recognized that it has been used in
本明細書において、“室温での反発弾性率”と
は、室温の環境下にて鋼球をスチレン−ブタジエ
ンゴム発泡体の平板に上方より自由落下させた場
合において、鋼球の落下距離（その落下位置から
発泡体までの距離）に対する反発距離（発泡体か
ら鋼球が跳ね返つて上昇した最高の高さまで距
離）の百分率割合を意味するものである。 In this specification, "repulsion modulus at room temperature" refers to the falling distance of a steel ball (its distance This refers to the percentage ratio of the repulsion distance (distance from the foam to the highest height the steel ball bounces from) to the distance from the falling position to the foam.
かかる反発弾性率は、具体的には、以下の試験
に従つて求めることができる。 Specifically, such a rebound modulus can be determined according to the following test.
１ 試験片
スチレン−ブタジエンゴム発泡体より成る、
上下両面が平行である平板を用いる。1 Test piece Made of styrene-butadiene rubber foam,
A flat plate with parallel upper and lower surfaces is used.
試験片には、通常、一辺の長さが100mm以上
で厚さが50mm以上であるものを使用する。 The test piece usually has a side length of 100 mm or more and a thickness of 50 mm or more.
２ 試験装置
5/8並級の鋼球を、試験片の上面から460mm上
方の位置から試験片へ、磁石その他の手段によ
り非回転の状態を保ちながら、自由落下させる
機構の試験機を用いる。試験片は、試験機の下
部の水平な台の上に置かれる。2. Testing device A testing device is used that allows a 5/8 grade steel ball to fall freely onto the test piece from a position 460 mm above the top of the test piece while being kept in a non-rotating state by magnets or other means. The specimen is placed on a horizontal platform at the bottom of the testing machine.
３ 試験方法
5/8並級の鋼球を、これより460mm下方の試験
片に自由落下させ、このときの鋼球の反発距離
（試験片上面から鋼球が跳ね返つて上昇した最
高の高さまでの距離）を測定する。3 Test method A 5/8 average grade steel ball is freely dropped onto a test piece 460 mm below it, and the repulsion distance of the steel ball at this time (the highest height that the steel ball rebounds from the top of the test piece) distance).
かかる試験を、３個の試験片の各々について
または１個の試験片のうち３個所について、そ
れぞれ３回以上行ない、各回における鋼球の反
発距離を記録する。 This test is performed three or more times on each of the three test pieces or at three locations on one test piece, and the repulsion distance of the steel ball is recorded each time.
４ 評価
反発弾性率は次の式に従つて算出し、それら
の数値の平均値を以て、反発弾性率Ｒの値とす
る。4 Evaluation The rebound resilience rate is calculated according to the following formula, and the average value of these values is used as the value of the rebound resilience rate R.
Ｒ＝D1／D0×100
ここで、
Ｒ：反発弾性率（％）
D0：落下距離（＝460mm）
D1：反発距離（mm）
射出成形は、通常、射出される溶融樹脂の内部
圧力が約250Kg／cm2以上でかつその温度が当該樹
脂の融点より約20℃高温になるように射出圧力や
射出温度等の条件を設定して行なわれる。従つ
て、溶融樹脂と積層されるクツシヨン材は、その
ような高圧力によつて破損または圧潰されずかつ
そのような高温度でも熱変形や溶融しない耐圧、
耐熱特性を備えていることが望まれる。本発明に
用いるスチレン−ブタジエンゴム発泡体は、融
点、熱変形温度が高く、その要請に応える耐熱性
を有し、密度0.3ないし0.6ｇ／cm3の該発泡体は上
記の圧力により破損、圧潰されず、十分な耐圧性
を有する。0.3ｇ／cm3未満の低密度のスチレン−
ブタジエンゴム発泡体を使用すると、射出成形時
その全部または一部が破損、圧潰され、また0.6
ｇ／cm3を越える高密度の該発泡体を使用すると、
射出成形時クツシヨン材が成形後の樹脂基材の外
形に適合するように変形しその後も被覆状態を維
持し続ける能力、所謂樹脂基材への追従性が極め
て乏しくなる。また、本発明で使用するスチレン
−ブタジエンゴム発泡体は、室温での反発弾性率
が３％以下であることが必要とされる。反発弾性
率が３％以下であると、樹脂基材への十分な追従
性を有するが、反発弾性率が３％を越えると、ク
ツシヨン材の当該発泡体が樹脂基材の外形に追従
し難くなり該基材より剥離し易くなる。さらに、
本発明に用いるスチレン−ブタジエンゴム発泡体
は、独立気泡率が80％以上であることが必要とさ
れる。独立気泡の割合が80％以上の該発泡体であ
ると、成形時射出樹脂の圧力によつて圧潰、破損
されずしかも樹脂基材の外形に柔軟に追従する
が、独立気泡率が80％未満で連続気泡の割合が多
い該発泡体であると、成形時射出樹脂の圧力によ
つて非常に圧潰、破損され易い。 R=D 1 /D 0 ×100 Where, R: Repulsion modulus (%) D 0 : Falling distance (=460mm) D 1 : Repulsion distance (mm) Injection molding usually involves the inside of the injected molten resin. The conditions such as injection pressure and injection temperature are set so that the pressure is about 250 kg/cm 2 or higher and the temperature is about 20° C. higher than the melting point of the resin. Therefore, the cushion material that is laminated with the molten resin must have a pressure resistance that will not be damaged or crushed by such high pressure, and will not be thermally deformed or melted even at such high temperatures.
It is desirable that the material has heat resistance properties. The styrene-butadiene rubber foam used in the present invention has a high melting point and heat distortion temperature, and has heat resistance that meets these requirements . It has sufficient pressure resistance. Styrene with low density less than 0.3g/ cm3
If butadiene rubber foam is used, all or part of it will be damaged or crushed during injection molding, and 0.6
When using the foam with a high density of more than g/ cm3 ,
During injection molding, the cushion material deforms to fit the outer shape of the resin base material after molding, and the ability to continue to maintain the covering state even after the molding, so-called followability to the resin base material, becomes extremely poor. Furthermore, the styrene-butadiene rubber foam used in the present invention is required to have a rebound modulus of 3% or less at room temperature. If the rebound modulus is 3% or less, it has sufficient followability to the resin base material, but if the rebound modulus exceeds 3%, it becomes difficult for the foam of the cushion material to follow the outer shape of the resin base material. This makes it easier to peel off from the base material. moreover,
The styrene-butadiene rubber foam used in the present invention is required to have a closed cell ratio of 80% or more. If the foam has a closed cell ratio of 80% or more, it will not be crushed or damaged by the pressure of the injected resin during molding, and will flexibly follow the external shape of the resin base material, but the closed cell ratio will be less than 80%. If the foam has a high proportion of open cells, it will be easily crushed and damaged by the pressure of the injected resin during molding.
＜実施例＞ 以下、本発明の実施例を図面により説明する。<Example> Embodiments of the present invention will be described below with reference to the drawings.
実施例は、第１図に示す自動車用フロントピラ
ーガーニツシユの成形に適用したものであるが、
本発明の成形方法は、これに限定されず、クツシ
ヨン性を有すると更に有用になる他の各種樹脂製
品の製造に利用することができる。 The example is applied to the molding of an automobile front pillar garnish shown in FIG.
The molding method of the present invention is not limited thereto, and can be used to manufacture various other resin products that would be more useful if they had cushioning properties.
まず、第３図に示すように、目付120ｇ／m2、
丸編みのポリエステル起毛フアブリツクの表皮材
１、および密度0.47ｇ／cm3、室温での反発弾性率
2.7％、独立気泡率80％そして厚さ３mmのスチレ
ン−ブタジエンゴム発泡シート（商品名ZDEL(株)
ブリヂストン製）のクツシヨン材２を、フロント
ピラーガーニツシユ形状の型面を有する射出成形
機の成型金型４ａ，４ｂのキヤビテイ５に接着剤
で重ねて収めた。このとき、表皮材１およびクツ
シヨン材２は適当なテンシヨンにより張られてい
る。 First, as shown in Figure 3, the basis weight is 120g/m 2 ,
Surface material 1 of circular knitted polyester brushed fabric, density 0.47 g/cm 3 , rebound modulus at room temperature
Styrene-butadiene rubber foam sheet of 2.7%, closed cell ratio 80%, and thickness 3mm (product name: ZDEL Co., Ltd.)
A cushion material 2 (manufactured by Bridgestone) was stacked with an adhesive and housed in the cavity 5 of molding molds 4a and 4b of an injection molding machine having a mold surface in the shape of a front pillar garnish. At this time, the skin material 1 and the cushion material 2 are stretched with appropriate tension.
次に、第４図に示すように、成形金型４ａ，４
ｂを閉じ、成形機内で200℃に加熱溶融されたポ
リプロピレンコポリマーの樹脂基材６をゲート７
よりキヤビテイ５内に250Kg／cm2の圧力で注入、
射出して、表皮材１とクツシヨン材２と樹脂基材
６とをこの順序に積層成形し、第２図に示す積層
断面を有するフロントピラーガーニツシユ８を製
作した。 Next, as shown in FIG.
b is closed, and the polypropylene copolymer resin base material 6 heated and melted at 200°C in the molding machine is passed through the gate 7.
Inject into cavity 5 at a pressure of 250Kg/cm 2 .
The skin material 1, cushion material 2, and resin base material 6 were laminated in this order by injection molding to produce a front pillar garnish 8 having the laminated cross section shown in FIG.
製作したフロントピラーガーニツシユ８は、溶
融、圧潰および破損個所が全く無く、表皮材１と
クツシヨン材２と樹脂基材６とが完全に一体化さ
れており、クツシヨン材２等の接着強度も手で容
易に樹脂基材６より剥離することができない程度
に強いものであつた。また、クツシヨン材２の厚
みが射出成形を経ても殆ど減少せず、成形後のク
ツシヨン材２の厚さが成形前のそれの90％以上に
保たれており、製作品のフロントピラーガーニツ
シユ８は高いクツシヨン性を有する積層成形品で
あつた。しかも、製品表面にフアブリツクの風合
いがそのまま完全に残されており、硬い触感を与
える従来のフロントピラーガーニツシユに代用し
得る成形品であつた。 The manufactured front pillar garnish 8 has no melted, crushed or damaged parts, and the skin material 1, cushion material 2, and resin base material 6 are completely integrated, and the adhesive strength of the cushion material 2, etc. It was so strong that it could not be easily peeled off from the resin base material 6 by hand. In addition, the thickness of the cushion material 2 hardly decreases even after injection molding, and the thickness of the cushion material 2 after molding is maintained at 90% or more of that before molding, and the front pillar garnish of the manufactured product is No. 8 was a laminated molded product with high cushioning properties. Moreover, the texture of the fabric was completely retained on the surface of the product, making it a molded product that could be used as a substitute for conventional front pillar garnishes that give a hard feel.
また、比較のため、クツシヨン材の種類や材質
などを変えて次に述べるフロントピラーガーニツ
シユを試作してみた。 For comparison, we also tried making the following front pillar garnish by changing the type and material of the cushion.
比較例１および比較例２
実施例のウツシヨン材２の代わりに、密度0.2
ｇ／cm3、室温での反発弾性率２％、そして独立気
泡率70％のスチレン−ブタジエン発泡シート（厚
さ３mm）、および密度0.7ｇ／cm3、同反発弾性率４
％、そして独立気泡率80％のスチレン−ブタジエ
ン発泡シート（厚さ３mm）を夫々クツシヨン材に
使用し、他の材料を実施例と同一にして、実施例
と同様の射出成形により積層成形し、比較例１お
よび比較例２のフロントピラーガーニツシユを製
作した。Comparative Example 1 and Comparative Example 2 Instead of the mounting material 2 of the example, a density of 0.2
Styrene-butadiene foam sheet (thickness : 3 mm) with a rebound modulus of 2% at room temperature and a closed cell ratio of 70%, and a density of 0.7 g/cm 3 and a rebound modulus of 4 at room temperature.
% and a styrene-butadiene foam sheet (thickness: 3 mm) with a closed cell ratio of 80%, respectively, were used as cushion materials, other materials were the same as in the examples, and laminated molding was performed by injection molding in the same manner as in the examples. Front pillar garnishes of Comparative Example 1 and Comparative Example 2 were manufactured.
低密度で独立気泡の割合が小さいスチレン−ブ
タジエンゴム発泡体を使用して製作した比較例１
の積層成形品は、クツシヨン材の一部が破損また
は圧潰されており、クツシヨン性が十分には残つ
ていなかつた。また、高密度で反発弾性が強いス
チレン−ブタジエンゴム発泡体を使用して製作し
た比較列２の積層成形品は、樹脂基材への追従性
が悪く、クツシヨン材の前記発泡体が所々で樹脂
基材より剥離していた。 Comparative Example 1 manufactured using styrene-butadiene rubber foam with low density and small proportion of closed cells
In the laminated molded product, a portion of the cushion material was damaged or crushed, and sufficient cushioning properties remained. In addition, the laminate molded product in comparative row 2, which was manufactured using a styrene-butadiene rubber foam with high density and strong impact resilience, had poor conformability to the resin base material, and the foam of the cushion material was partially affected by the resin. It had peeled off from the base material.
比較例 ３
目付150ｇ／m2、トリコツト編みのポリエステ
ル起毛フアブリツクの表皮材および密度0.03ｇ／
cm3、室温での反発弾性率12％の連続気泡ウレタン
フオーム（厚さ５mm）のクツシヨン材を成形金型
のキヤビテイに重ねて収め、実施例と同様に条件
で溶融樹脂を該キヤビテイ内に射出注入して、積
層成形し、フロントピラーガーニツシユ形状の比
較例３の成形品を製作した。Comparative Example 3 Fabric weight: 150 g/m 2 , skin material of tricot-knitted polyester brushed fabric and density: 0.03 g/m 2
A cushion material of open-cell urethane foam (thickness: 5 mm) with a rebound elasticity of 12% at room temperature was stacked and placed in the cavity of a mold , and molten resin was injected into the cavity under the same conditions as in the example. The molded product of Comparative Example 3 having the shape of a front pillar garnish was manufactured by injecting and laminating the molded product.
該成形品は、射出樹脂の圧力により前記クツシ
ヨン材が殆ど圧潰されており、成形品の表面に弾
力が全く無かつた。しかも、該表面はフアブリツ
クの風合いが相当に失なわれていた。 In the molded product, the cushion material was almost crushed by the pressure of the injected resin, and the surface of the molded product had no elasticity at all. Moreover, the surface had considerably lost its fabric texture.
比較例 ４
目付200ｇ／m2、丸編みのポリエステル起毛フ
アブリツクの表皮材および密度0.05ｇ／cm3、室温
での反発弾性率50％の連続気泡ポリエチレンフオ
ーム（厚さ５mm）のクツシヨン材を使用し、比較
例３と同様の射出成形により同様な形状の成形品
を作つた。Comparative Example 4 A skin material made of circular knitted polyester brushed fabric with a basis weight of 200 g/m 2 and a cushion material made of open-cell polyethylene foam (thickness 5 mm) with a density of 0.05 g/cm 3 and a rebound modulus of 50% at room temperature. A molded article having a similar shape was made by injection molding in the same manner as in Comparative Example 3.
該成形品は、射出樹脂の熱により前記クツシヨ
ン材が殆ど溶融され、また樹脂基材の一部が表皮
材中を通つて成形品の表面に露出していた。 In the molded product, most of the cushion material was melted by the heat of the injected resin, and a portion of the resin base material passed through the skin material and was exposed on the surface of the molded product.
これらの結果、上述の諸物性を有するスチレン
−ブタジエンゴム発泡体は、射出成形に使用して
もそのクツシヨン特性を殆ど保つことがわかる。 These results show that the styrene-butadiene rubber foam having the above-mentioned physical properties maintains most of its cushioning properties even when used in injection molding.
＜発明の効果＞
以上説明したように、本発明の積層射出成形方
法は、発泡密度が低くかつ反発弾性が弱くさらに
独立気泡の割合が多いスチレン−ブタジエンゴム
発泡体をクツシヨン材に使用する積層成形法とし
たことにより、該発泡体の高弾性を射出成形を経
ても殆ど損なわれずに残すことができ、高いクツ
シヨン性を有し従来には無い格段に柔らかな触感
を与える樹脂成形品を製作することができ、各種
の樹脂製品にクツシヨン性を持たせるのに有用で
ある。<Effects of the Invention> As explained above, the laminated injection molding method of the present invention is capable of laminated molding in which a styrene-butadiene rubber foam with low foaming density, weak rebound resilience, and a high proportion of closed cells is used as a cushion material. By adopting this method, the high elasticity of the foam can be maintained almost unimpaired even after injection molding, and a resin molded product with high cushioning properties and a much softer touch than ever before can be produced. It is useful for imparting cushioning properties to various resin products.
第１図は本発明の実施例の方法により成形した
自動車用フロントピラーガーニツシユを示す斜視
図、第２図は第１図の−線における断面図、
第３図および第４図は実施例の方法に従う射出成
形工程を示す図である。
図中、１……表皮材、２……クツシヨン材、４
ａ，４ｂ……成形金型、５……キヤビテイ、６…
…樹脂基材。
FIG. 1 is a perspective view showing a front pillar garnish for an automobile formed by the method of the embodiment of the present invention, FIG. 2 is a sectional view taken along the line - in FIG. 1,
FIGS. 3 and 4 are diagrams showing an injection molding process according to the method of the embodiment. In the figure, 1...Skin material, 2...Cushion material, 4
a, 4b...Molding mold, 5...Cavity, 6...
...Resin base material.
Claims (1)
ビテイに重ねて収め、その後加熱溶融された樹脂
基材を該キヤビテイ内に射出注入して、前記表皮
材、クツシヨン材および樹脂基材をこの順序に積
層成形するにあたり、密度0.3ないし0.6ｇ／cm3、
室温での反発弾性率３％以下、および独立気泡率
80％以上のスチレン−ブタジエンゴム発泡体を前
記クツシヨン材に使用したことを特徴とする積層
射出成形方法。1. A skin material and a cushion material are stacked and placed in a cavity of a molding die, and then a heated and melted resin base material is injected into the cavity, and the skin material, cushion material, and resin base material are laminated in this order. When molding, the density is 0.3 to 0.6 g/cm 3 ,
Impact resilience at room temperature 3% or less and closed cell ratio
A laminated injection molding method characterized in that a styrene-butadiene rubber foam containing 80% or more is used as the cushion material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24919584A JPS61127320A (en) | 1984-11-26 | 1984-11-26 | Laminated injection molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24919584A JPS61127320A (en) | 1984-11-26 | 1984-11-26 | Laminated injection molding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61127320A JPS61127320A (en) | 1986-06-14 |
| JPH0533130B2 true JPH0533130B2 (en) | 1993-05-18 |
Family
ID=17189313
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24919584A Granted JPS61127320A (en) | 1984-11-26 | 1984-11-26 | Laminated injection molding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61127320A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6418622A (en) * | 1987-07-14 | 1989-01-23 | Kasai Kogyo Kk | Manufacture of interior trim for automobile |
| EP0331447B1 (en) * | 1988-03-01 | 1994-06-08 | Toray Industries, Inc. | Process for preparation of molded laminated article |
| JP2787214B2 (en) * | 1988-11-29 | 1998-08-13 | 株式会社ジェイエスピー | Method for producing composite foam |
-
1984
- 1984-11-26 JP JP24919584A patent/JPS61127320A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61127320A (en) | 1986-06-14 |
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