JP2003154541A - Injection foamed molding and its manufacturing method - Google Patents
Injection foamed molding and its manufacturing methodInfo
- Publication number
- JP2003154541A JP2003154541A JP2001357361A JP2001357361A JP2003154541A JP 2003154541 A JP2003154541 A JP 2003154541A JP 2001357361 A JP2001357361 A JP 2001357361A JP 2001357361 A JP2001357361 A JP 2001357361A JP 2003154541 A JP2003154541 A JP 2003154541A
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- JP
- Japan
- Prior art keywords
- injection
- resin
- molding
- molded article
- mold
- 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.)
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Landscapes
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (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、熱可塑性樹脂から
なる射出発泡成形体およびその製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection foam molding made of a thermoplastic resin and a method for producing the same.
【０００２】[0002]
【従来の技術】熱可塑性樹脂製の成形品に強度を補強す
る等の目的のためにリブを付設しようとすると、天板に
窪み（ヒケ）が発生し、外観を悪化させるという問題が
あった。これは、成形時、他の一般部と比べ天板とリブ
の付根の部分の冷却が遅れて体積収縮量に差が生じるた
めと考えられる。この対策のため従来から、射出速度や
保圧条件を適正化する成形法の改良や、リブを別に成形
した後、意匠面に接着させる工程上の改良、また、ヒケ
の発生する面にシボを付与することでヒケを隠すデザイ
ン面の改良、一般板厚に対しリブの板厚を薄くすること
で、ヒケ発生部の体積収縮量を小さくする製品設計面で
の改良、フィラーを添加した体積収縮の少ない熱可塑性
樹脂を選択する材料面での工夫などが行われてきた。と
ころが、これらの方法は、材料選択、製品設計や金型設
計の自由度を小さくするだけでなく、製造コストが高く
なったり、リブ本来の役割（一例を挙げると、自動車安
全規制に関わる衝撃エネルギーを吸収する働き）を求め
る上で性能不十分な形状を選択することにつながること
があった。2. Description of the Related Art When a rib is attached to a molded product made of a thermoplastic resin for the purpose of reinforcing the strength, there is a problem that a dent (sink) occurs on the top plate and the appearance is deteriorated. . It is considered that this is because during molding, cooling of the top plate and the root of the rib is delayed compared to other general parts, and a difference in volume shrinkage occurs. As a countermeasure against this, conventionally, there has been an improvement in the molding method that optimizes the injection speed and pressure-holding conditions, an improvement in the process in which ribs are separately molded and then bonded to the design surface, and there are wrinkles on the surface where sink marks occur. Improvement of the design surface to hide the sink mark by giving it, improvement of the product design surface to reduce the volume shrinkage amount of the sink portion by making the plate thickness of the rib thinner than the general plate thickness, volume shrinkage with the addition of filler There have been various efforts in material selection, such as selecting a thermoplastic resin that has little However, these methods not only reduce the flexibility of material selection, product design and mold design, but also increase the manufacturing cost and the original role of the rib (for example, impact energy related to automobile safety regulations). It may lead to the selection of a shape with insufficient performance in seeking the function of absorbing ().
【０００３】一方、体積収縮分を発泡による体積膨張で
補うことでヒケ対策を行なう試みが古くから成されてい
るが、一般的な成形条件で射出発泡成形すると表面にシ
ルバーストリークと呼ばれる外観不良を生じ、自動車内
装部品のような高級な外観を要求される用途には適さな
かった。シルバーストリーク不良を避けるためにシリン
ダー温度を下げる方法も知られているが、該方法では発
泡による体積膨張力が弱く、肝心のヒケ対策の面で十分
な効果は得られなかった。On the other hand, it has been attempted for a long time to prevent sink marks by compensating for volume shrinkage with volume expansion due to foaming. However, when injection foam molding is performed under general molding conditions, a surface appearance defect called silver streak occurs. Therefore, it was not suitable for applications requiring high-grade appearance such as automobile interior parts. A method of lowering the cylinder temperature in order to avoid silver streak failure is also known, but with this method, the volume expansion force due to foaming is weak and a sufficient effect cannot be obtained in terms of measures against core sink.
【０００４】[0004]
【発明が解決しようとする課題】かかる状況下、本発明
の目的は、ヒケやシルバーストリーク不良の改良された
射出成形体、およびその製造方法を提供することにあ
る。Under such circumstances, an object of the present invention is to provide an injection molded article having improved sink marks and silver streak defects, and a method for producing the same.
【０００５】[0005]
【課題を解決するための手段】本発明は、化学発泡剤を
含有する熱可塑性樹脂をシリンダー内で溶融混練し、金
型内に注入し、冷却固化させて成形する射出発泡成形体
の製造方法であって、成形温度が２００〜２８０℃であ
り、キャビティ充填中の剪断速度が１８００（１／秒）
以上である射出発泡成形体の製造方法、および該製造方
法により製造されてなる射出発泡成形体にかかるもので
ある。以下、詳細に説明する。DISCLOSURE OF THE INVENTION The present invention is a method for producing an injection-foam molded article in which a thermoplastic resin containing a chemical foaming agent is melt-kneaded in a cylinder, poured into a mold, cooled and solidified, and molded. And the molding temperature was 200 to 280 ° C., and the shear rate during the cavity filling was 1800 (1 / sec).
The present invention relates to the method for producing an injection-foam molded article and the injection-foam molded article produced by the method. The details will be described below.
【０００６】[0006]
【発明の実施の形態】本発明で用いられる熱可塑性樹脂
は、特に限定されるものではなく、スチレン系樹脂、ア
クリル系樹脂やアミド系樹脂などを例示でき、オレフィ
ン系樹脂が好ましく用いられる。オレフィン系樹脂とし
ては、例えばエチレン、プロピレン、ブテン−１、ペン
テン−１、ヘキセン−１、３−メチルブテン−１、４−
メチルペンテン−１などのα−オレフィンの単独重合体
やこれらの中から選ばれる少なくとも２種類のモノマー
を共重合してなる共重合体、これらと共重合可能な他の
不飽和単量体との共重合体等が挙げられる。上記の中で
も、プロピレン系樹脂が好ましく用いられる。ここでい
うプロピレン系樹脂とは、プロピレンを重合してなる重
合体であってアイソタクチック結晶性を有するものであ
る。プロピレン系樹脂として例えば、プロピレンの単独
重合体、プロピレンとエチレンおよび／または炭素原子
数４〜１２のα−オレフィンとの共重合体等が挙げられ
る。プロピレン系樹脂としては、ＪＩＳ Ｋ６７５８に
基づいて測定したメルトフローレートが１〜３０ｇ／１
０分であることが好ましい。BEST MODE FOR CARRYING OUT THE INVENTION The thermoplastic resin used in the present invention is not particularly limited, and examples thereof include a styrene resin, an acrylic resin and an amide resin, and an olefin resin is preferably used. Examples of the olefin resin include ethylene, propylene, butene-1, pentene-1, hexene-1, 3-methylbutene-1,4-
A homopolymer of α-olefin such as methylpentene-1, a copolymer obtained by copolymerizing at least two kinds of monomers selected from these, and other unsaturated monomers copolymerizable therewith Examples thereof include copolymers. Among the above, propylene resin is preferably used. The propylene-based resin here is a polymer obtained by polymerizing propylene and has isotactic crystallinity. Examples of the propylene-based resin include a propylene homopolymer and a copolymer of propylene and ethylene and / or an α-olefin having 4 to 12 carbon atoms. The propylene-based resin has a melt flow rate of 1 to 30 g / 1 measured according to JIS K6758.
It is preferably 0 minutes.
【０００７】本発明で用いられる熱可塑性樹脂として
は、これらの熱可塑性樹脂を単独または２種以上用いて
もよい。本発明を、熱可塑性樹脂を２種以上用いてなる
組成物に適用する場合、該組成物として好ましくは、プ
ロピレン系樹脂を５０重量％以上（樹脂成分の合計を１
００重量％とする表記）含有する組成物が用いられる。As the thermoplastic resin used in the present invention, these thermoplastic resins may be used alone or in combination of two or more kinds. When the present invention is applied to a composition comprising two or more thermoplastic resins, the composition is preferably 50% by weight or more of propylene resin (total of resin components is 1
The composition containing 100% by weight) is used.
【０００８】本発明で用いられる化学発泡剤としては、
熱可塑性樹脂の射出発泡成形に用いられる化学発泡剤で
あれば特に制限は無く、ＡＤＣＡ系化学発泡剤に代表さ
れる有機系化学発泡剤；重曹やクエン酸に代表される無
機系化学発泡剤を例示できる。金型汚染を防止する観点
から、後者が好ましい。The chemical foaming agent used in the present invention includes:
There is no particular limitation as long as it is a chemical foaming agent used for injection foam molding of a thermoplastic resin, and an organic chemical foaming agent represented by ADCA chemical foaming agent; an inorganic chemical foaming agent represented by baking soda or citric acid. It can be illustrated. The latter is preferable from the viewpoint of preventing mold contamination.
【０００９】これら化学発泡剤は、成形時の樹脂温度に
より発生するガス量が異なるので、一般的な使用量を例
示することは困難である。最終製品の発泡倍率に適うガ
ス量に応じた量を適宜添加すればよい。Since the amount of gas generated by these chemical foaming agents differs depending on the resin temperature during molding, it is difficult to exemplify the general amount used. The amount may be appropriately added according to the amount of gas suitable for the expansion ratio of the final product.
【００１０】本発明の製造方法は、成形温度が２００〜
２８０℃となる条件で行う。ここでいう成形温度とは、
金型内へ注入される直前の溶融樹脂温度を指し、シリン
ダーユニットを金型から離した状態で樹脂を射出して得
られた直後の溶融樹脂の温度を熱伝対温度計で測定する
ことによって求められる。該成形温度は、シリンダーの
温度設定や可塑化工程でのスクリュー回転数および背圧
を調整する方法により制御される。該成形温度が低すぎ
ると、樹脂の粘度が上昇し発泡しにくくなり、リブ部の
ヒケが増すため好ましくない。また該成形温度が高すぎ
ると破泡しやすくなるので好ましくない。該成形温度は
２００〜２８０℃が好ましく、２２０〜２６０℃が更に
好ましい。In the manufacturing method of the present invention, the molding temperature is from 200 to
The condition is 280 ° C. The molding temperature here is
It refers to the temperature of the molten resin immediately before being injected into the mold, and by measuring the temperature of the molten resin immediately after being obtained by injecting the resin with the cylinder unit separated from the mold, using a thermocouple thermometer. Desired. The molding temperature is controlled by setting the temperature of the cylinder and adjusting the screw rotation speed and back pressure in the plasticizing step. If the molding temperature is too low, the viscosity of the resin increases, foaming becomes difficult, and sink marks at the ribs increase, which is not preferable. On the other hand, if the molding temperature is too high, foaming tends to occur, which is not preferable. The molding temperature is preferably 200 to 280 ° C, more preferably 220 to 260 ° C.
【００１１】また本発明の製造方法は、キャビティへの
溶融樹脂の充填を高速で実施するものであり、キャビテ
ィ充填中の剪断速度が１８００（１／秒）以上、好まし
くは１９００〜４０００（１／秒）、さらに好ましくは
２０００〜３０００（１／秒）となる条件で行う。正否
は定かではないが本発明者らの検討によれば、シルバー
ストリークは、キャビティ内を流れてゆく樹脂の流れの
最先端付近で発生した気泡が金型壁面で擦られることで
生じると考えられ、また、該気泡が該金型壁面に到達し
た際に該金型壁面と接する樹脂の温度が十分高いと、一
度生じたシルバーストリークは最終的には目立たなくな
ると考えられ、本発明においては高速で溶融樹脂をキャ
ビティへ充填させることによる金型壁面での剪断発熱に
より金型壁面と接する樹脂の温度が高くなって、シルバ
ーストリーク不良が改良されると考えられる。この説の
正否がいずれであるにせよ、本発明によれば、ヒケやシ
ルバーストリーク不良の改良された射出成形体が得られ
る。Further, in the manufacturing method of the present invention, the molten resin is filled into the cavity at a high speed, and the shear rate during filling the cavity is 1800 (1 / sec) or more, preferably 1900 to 4000 (1 / Second), and more preferably 2000 to 3000 (1 / second). Although it is not clear whether it is right or wrong, according to the study of the present inventors, it is considered that the silver streak is caused by the bubbles generated near the leading edge of the resin flow flowing in the cavity being rubbed against the mold wall surface. Further, if the temperature of the resin in contact with the wall surface of the mold is sufficiently high when the bubbles reach the wall surface of the mold, it is considered that the silver streak once generated is finally inconspicuous, and in the present invention, high speed is achieved. It is considered that the temperature of the resin in contact with the mold wall surface increases due to the shearing heat generation on the mold wall surface caused by filling the molten resin into the cavity, and the silver streak defect is improved. Whether this theory is right or wrong, according to the present invention, an injection-molded article with improved sink marks and silver streak defects can be obtained.
【００１２】キャビティ充填中の剪断速度は、例えば、
キャビティ内の樹脂流動方向に対し直角な断面が長方形
である場合にはその巾および厚み（いずれも金型の寸
法）ならびに単位時間あたりの流量（射出率）から、下
記計算式で求めることができる。
剪断速度＝６×（流量）／｛巾×厚み2｝
なお、該剪断速度は、射出成形時の成形温度や射出速度
の設定により制御される。The shear rate during cavity filling is, for example,
When the cross-section perpendicular to the resin flow direction in the cavity is rectangular, it can be calculated from the width and thickness (both dimensions of the mold) and the flow rate per unit time (injection rate) using the following formula. . Shear rate = 6 × (flow rate) / {width × thickness 2 } The shear rate is controlled by setting the molding temperature and the injection speed during injection molding.
【００１３】本発明の製造方法を実施するに際しては、
金型や射出成形装置に対し新たな設備や付加機構は特に
必要ないが、成形品のさらなる軽量化のため、必要であ
れば製品の板厚を２ｍｍ以上にすることが好ましい。こ
のときの板厚とは、型締め方向に対して直角な面かつ製
品の大部分を占める部位の厚みを指す。更に発泡倍率を
向上させるために、樹脂充填後、金型の動作により、キ
ャビティ容積を増す工法を用いても良い。この場合の前
記板厚とは、金型動作が開始される前の厚みを言う。In carrying out the manufacturing method of the present invention,
No new equipment or additional mechanism is required for the mold or the injection molding apparatus, but in order to further reduce the weight of the molded product, it is preferable to make the plate thickness of the product 2 mm or more if necessary. The plate thickness at this time refers to the thickness of a surface that is orthogonal to the mold clamping direction and that occupies most of the product. In order to further improve the foaming ratio, a method of increasing the cavity volume by operating the mold after filling the resin may be used. In this case, the plate thickness means the thickness before the mold operation is started.
【００１４】本発明の製造方法における樹脂注入量は、
樹脂注入終了直後の時点でキャビティ容積すべてが樹脂
で充満される量であることが好ましい。The resin injection amount in the manufacturing method of the present invention is
It is preferable that the entire cavity volume be filled with the resin immediately after the completion of the resin injection.
【００１５】本発明の製造方法は、リブを付設した射出
成形体に限らず、同様のヒケが発生するような種々の射
出成形体の製造に適している。本発明の製造方法は、リ
ブを付設した射出成形体に好適に適用される。The manufacturing method of the present invention is not limited to the injection-molded body provided with the ribs, but is suitable for manufacturing various injection-molded bodies in which similar sink marks are generated. The manufacturing method of the present invention is suitably applied to an injection molded body provided with ribs.
【００１６】本発明の射出発泡成形体は、上記した製造
方法により製造されてなる射出発泡成形体であり、ヒケ
やシルバーストリーク不良が改良された射出成形体であ
る。本発明の射出発泡成形体の好適な態様としては、リ
ブを付設した射出発泡成形体が挙げられる。本発明の射
出発泡成形体は軽量化されており、その発泡倍率として
好ましくは、１倍を越え５倍以下であり、さらに好まし
くは１．０５〜３倍である。The injection-foam molded article of the present invention is an injection-foam molded article manufactured by the above-mentioned manufacturing method, and is an injection-molded article with improved sink marks and silver streak defects. A preferred embodiment of the injection foam molded article of the present invention is an injection foam molded article provided with ribs. The injection-foamed molded product of the present invention is lightened, and the expansion ratio thereof is preferably more than 1 time and 5 times or less, more preferably 1.05 to 3 times.
【００１７】[0017]
【実施例】以下、本発明を実施例に従って説明するが、
これに限定されるものではない。実施例および比較例に
おける評価方法は以下の通りである。EXAMPLES The present invention will be described below with reference to examples.
It is not limited to this. The evaluation methods in Examples and Comparative Examples are as follows.
【００１８】（１）メルトーフローレート
ＪＩＳ Ｋ６７５８に従い、温度２３０℃、荷重２１．
１８Ｎで測定した。(1) Melt flow rate According to JIS K6758, temperature 230 ° C., load 21.
It was measured at 18N.
【００１９】（２）製品外観（シルバーストリークの判
定）
シルバーストリークの度合を、目視により官能評価し
た。
○：成形品表面の全ての部位に関して、全くシルバース
トリークが観測されない。
×：成形品表面の少なくとも１部分にシルバーストリー
クが認められる。(2) Product Appearance (Judgment of Silver Streak) The degree of silver streak was sensory evaluated visually. ◯: No silver streak is observed at all parts of the surface of the molded product. X: Silver streak is recognized on at least one part of the surface of the molded product.
【００２０】（３）ヒケ
リブヒケの度合を、目視により官能評価した。
○：全てのリブに関して、まったくヒケが観測されな
い。
△：少なくとも１箇所のリブに関して、ヒケが認められ
る。
×：少なくとも１箇所のリブに関して、大きなヒケが認
められる。(3) Sinking The degree of sinking was sensory evaluated visually. ◯: No sink mark is observed for all ribs. Δ: A sink mark is recognized on at least one rib. X: A large sink mark is recognized in at least one rib.
【００２１】（４）重量 成形品の重量を台はかりにより測定した。(4) Weight The weight of the molded product was measured by a platform scale.
【００２２】実施例および比較例に用いた材料は、以下
の通りである。
（１）プロピレン系樹脂
プロピレン−エチレンブロック共重合体（住友化学工業
（株）製住友ノーブレンＡＺ１６１Ｃ；メルトフローレ
ート＝３０ｇ／１０ｍｉｎ）を用いた。Materials used in Examples and Comparative Examples are as follows. (1) Propylene resin A propylene-ethylene block copolymer (Sumitomo Chemical Co., Ltd. Sumitomo Noblene AZ161C; melt flow rate = 30 g / 10 min) was used.
【００２３】（２）発泡剤マスターバッチ
無機系化学発泡剤（三協化成（株）製ＭＢ３０６２）を
用いた。(2) Blowing Agent Masterbatch An inorganic chemical blowing agent (MB3062 manufactured by Sankyo Kasei Co., Ltd.) was used.
【００２４】（３）顔料マスターバッチ
住化カラー（株）製ブラックＳＰＥＭ−８Ｈ１０２ＨＣ
ＡＮを用いた。(3) Pigment master batch Black SPEM-8H102HC manufactured by Sumika Color Co., Ltd.
AN was used.
【００２５】実施例および比較例では、射出成形機とし
て、ＩＳ６５０Ｅ（東芝機械（株）製、シャットオフノ
ズル使用）を使用し、図１に示す射出成形品（３５０ｍ
ｍ×９０ｍｍ×２５ｍｍ）を得た。リブを除く部位の板
厚は３．０ｍｍ、リブ部の肉厚は、付け根部が１．４ｍ
ｍ、先端部が１．０ｍｍ、リブ部の高さは２５ｍｍであ
った。リブ部を除いた、金型のキャビティを流動方向に
直角な面で切断したときの製品巾は１２．５ｃｍ、板厚
は０．３ｃｍであり、射出率をＱ（ｃｍ3／秒）とする
と、剪断速度は、６×Ｑ÷（１２．５×０．３2）＝
５．３３×Ｑ（１／秒）となる。In the examples and comparative examples, IS650E (manufactured by Toshiba Machine Co., Ltd., using a shut-off nozzle) is used as an injection molding machine, and the injection molding product (350 m) shown in FIG. 1 is used.
m × 90 mm × 25 mm) was obtained. The plate thickness of the part excluding the rib is 3.0 mm, and the wall thickness of the rib part is 1.4 m at the base.
m, the tip portion was 1.0 mm, and the height of the rib portion was 25 mm. The product width is 12.5 cm and the plate thickness is 0.3 cm when the mold cavity is cut along a plane perpendicular to the flow direction, excluding the ribs, and the injection rate is Q (cm 3 / sec). , The shear rate is 6 × Q ÷ (12.5 × 0.3 2 ) =
It becomes 5.33 × Q (1 / second).
【００２６】［実施例１］ポリプロピレン、発泡剤マス
ターバッチ、顔料マスターバッチを、１００／２．０／
０．５（ｗｔ部／ｗｔ部／ｗｔ部）の配合比でドライブ
レンドし、混合材料を射出成形した。成形条件は、以下
の通りであった。
成形温度 ２３０℃
スクリュー回転数 １８８ｒｐｍ
背圧 ２．５ＭＰａ
射出率 ３９０ｃｍ3／秒（従って剪断速度は２０８０
（１／秒）であった。）
金型温度 ５４℃
冷却時間 ３０秒
得られた成形品について、重量、シルバーストリークお
よびヒケの評価を行った。結果を表１に示す。Example 1 Polypropylene, a foaming agent masterbatch, and a pigment masterbatch were mixed with 100 / 2.0 /
Dry blending was performed at a compounding ratio of 0.5 (wt part / wt part / wt part), and the mixed material was injection molded. The molding conditions were as follows. Molding temperature 230 ° C. Screw rotation number 188 rpm Back pressure 2.5 MPa Injection rate 390 cm 3 / sec (shear rate is 2080
(1 / second). ) Mold temperature 54 ° C. Cooling time 30 seconds The obtained molded product was evaluated for weight, silver streak and sink mark. The results are shown in Table 1.
【００２７】［実施例２］金型温度を８１℃に変更した
こと以外は、実施例１と同様である。得られた成形品に
ついて、重量、シルバーストリークおよびヒケの評価を
行った。結果を表１に示す。[Example 2] The same as Example 1 except that the mold temperature was changed to 81 ° C. The obtained molded product was evaluated for weight, silver streak and sink mark. The results are shown in Table 1.
【００２８】［比較例１］成形時の射出率を１９５ｃｍ
3／秒（剪断速度は１０４０（１／秒））に変更したこ
と以外は実施例１と同様である。得られた成形品につい
て、重量、シルバーストリークおよびヒケの評価を行っ
た。結果を表１に示す。[Comparative Example 1] The injection rate during molding was 195 cm.
Same as Example 1 except that the rate was changed to 3 / sec (shear rate was 1040 (1 / sec)). The obtained molded product was evaluated for weight, silver streak and sink mark. The results are shown in Table 1.
【００２９】［比較例２］成形時の成形温度を１８０℃
に変更したこと以外は実施例１と同様である。得られた
成形品について、重量、シルバーストリークおよびヒケ
の評価を行った。結果を表１に示す。[Comparative Example 2] The molding temperature at the time of molding was 180 ° C.
The same as Example 1 except that it was changed to. The obtained molded product was evaluated for weight, silver streak and sink mark. The results are shown in Table 1.
【００３０】[0030]
【表１】 [Table 1]
【００３１】[0031]
【発明の効果】以上詳述したように本発明によれば、ヒ
ケやシルバーストリーク不良の改良された射出成形体、
およびその製造方法が提供される。INDUSTRIAL APPLICABILITY As described in detail above, according to the present invention, an injection-molded article having improved sink marks and silver streak defects,
And a method for manufacturing the same are provided.
【図１】図１は、実施例で製造した射出成形品の形状を
表す図面である。FIG. 1 is a drawing showing the shape of an injection-molded article manufactured in an example.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｂ２９Ｋ 105:04 Ｂ２９Ｋ 105:04 Ｃ０８Ｌ 101:00 Ｃ０８Ｌ 101:00 (72)発明者 筒渕 雅明 千葉県市原市姉崎海岸５の１ 住友化学工 業株式会社内 Ｆターム(参考） 4F074 AA24 AA32 AA46 AA71 BA03 BA13 BA20 CA26 4F206 AA11 AB02 AG20 AG28 AM34 AM36 AR06 AR08 JA04 JF04 JL02 JM04 JN11 ─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 7 Identification code FI theme code (reference) B29K 105: 04 B29K 105: 04 C08L 101: 00 C08L 101: 00 (72) Inventor Masaaki Tsutsubuchi, Chiba City 1-5 Anezaki Kaigan, Hara-shi F-term within Sumitomo Chemical Co., Ltd. (reference) 4F074 AA24 AA32 AA46 AA71 BA03 BA13 BA20 CA26 4F206 AA11 AB02 AG20 AG28 AM34 AM36 AR06 AR08 JA04 JF04 JL02 JM04 JN11
Claims (5)
ンダー内で溶融混練し、金型内に注入し、冷却固化させ
て成形する射出発泡成形体の製造方法であって、成形温
度が２００〜２８０℃であり、キャビティ充填中の剪断
速度が１８００（１／秒）以上である射出発泡成形体の
製造方法。1. A method for producing an injection-foam molded article, which comprises melting and kneading a thermoplastic resin containing a chemical foaming agent in a cylinder, injecting it into a mold, cooling and solidifying and molding, and molding at a molding temperature of 200. A method for producing an injection-foam molded article, which has a shear rate of 1800 (1 / sec) or more and is 280 ° C.
る請求項１記載の射出発泡成形体の製造方法。2. The method for producing an injection-foam molded article according to claim 1, wherein the chemical foaming agent is an inorganic chemical foaming agent.
ある請求項１または２記載の射出発泡成形体の製造方
法。3. The method for producing an injection foam molded article according to claim 1, wherein the thermoplastic resin is a propylene resin.
により製造されてなる射出発泡成形体。4. An injection foam molded article produced by the production method according to claim 1.
求項４記載の射出発泡成形体。5. The injection foam molded article according to claim 4, wherein the expansion ratio is more than 1 and not more than 5 times.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001357361A JP2003154541A (en) | 2001-11-22 | 2001-11-22 | Injection foamed molding and its manufacturing method |
| US10/298,941 US6994814B2 (en) | 2001-11-22 | 2002-11-19 | Method for manufacturing injection-molded foamed article |
| DE10253962A DE10253962A1 (en) | 2001-11-22 | 2002-11-19 | Process for the production of foamed injection molded parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001357361A JP2003154541A (en) | 2001-11-22 | 2001-11-22 | Injection foamed molding and its manufacturing method |
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|---|---|
| JP2003154541A true JP2003154541A (en) | 2003-05-27 |
Family
ID=19168714
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|---|---|---|---|
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| Country | Link |
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| JP (1) | JP2003154541A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014174921A1 (en) * | 2013-04-22 | 2014-10-30 | トヨタ車体株式会社 | Resin component for vehicle and manufacturing method therefor |
| CN112405989A (en) * | 2019-08-21 | 2021-02-26 | 丰田自动车株式会社 | Injection foaming molding method |
-
2001
- 2001-11-22 JP JP2001357361A patent/JP2003154541A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014174921A1 (en) * | 2013-04-22 | 2014-10-30 | トヨタ車体株式会社 | Resin component for vehicle and manufacturing method therefor |
| JP2014210418A (en) * | 2013-04-22 | 2014-11-13 | トヨタ車体株式会社 | Resin component for vehicle, and method for producing the component |
| US9359013B2 (en) | 2013-04-22 | 2016-06-07 | Toyota Shatai Kabushiki Kaisha | Resin vehicle part and method for manufacturing same |
| CN112405989A (en) * | 2019-08-21 | 2021-02-26 | 丰田自动车株式会社 | Injection foaming molding method |
| CN112405989B (en) * | 2019-08-21 | 2022-09-23 | 丰田自动车株式会社 | Injection foaming molding method |
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