JP2917391B2 - Manufacturing method of resin molded products with reduced residual stress - Google Patents
Manufacturing method of resin molded products with reduced residual stressInfo
- Publication number
- JP2917391B2 JP2917391B2 JP9405590A JP9405590A JP2917391B2 JP 2917391 B2 JP2917391 B2 JP 2917391B2 JP 9405590 A JP9405590 A JP 9405590A JP 9405590 A JP9405590 A JP 9405590A JP 2917391 B2 JP2917391 B2 JP 2917391B2
- Authority
- JP
- Japan
- Prior art keywords
- resin
- residual stress
- molded article
- resin molded
- heating
- 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
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- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は樹脂成形品、特に熱可塑性樹脂成形品の残留
応力を高周波誘電加熱と熱風加熱を併用して低減した成
形品の製造法であり、従来のアニール処理に比較して、
より短時間に残留応力（残留歪み）が低減できるもので
あり、製造コストの低減に極めて有効なものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a method for producing a molded article in which the residual stress of a resin molded article, particularly a thermoplastic resin molded article, is reduced by using both high-frequency dielectric heating and hot-air heating. , Compared to conventional annealing
Residual stress (residual strain) can be reduced in a shorter time, which is extremely effective in reducing manufacturing costs.
自動車用ランプレンズ、特にヘッドランプレンズにお
いて、従来よりアクリル樹脂（RMMA）、アクリロニトリ
ル・スチレン樹脂（AS）が使用されてきたが、近年、機
械的強度、耐熱性の高いポリカーボネート樹脂が注目を
浴びてきており、実際に使用されている。Acrylic resin (RMMA) and acrylonitrile-styrene resin (AS) have been used in automotive lamp lenses, especially headlamp lenses. Polycarbonate resins with high mechanical strength and heat resistance have recently attracted attention. Have been used in practice.
しかし、ポリカーボネート樹脂単独では耐候性、耐擦
傷性に問題がある。この解決策として、耐候性、耐擦傷
性を改良するため、塗膜を形成する二次加工が主に実施
されている。ところが、この塗膜形成を行う為には、塗
膜形成時の白化、割れ及び長期疲労に対する割れを防止
するための成形歪みを取る残留応力低減工程（＝アニー
ル処理工程）、塗膜の密着性や外観を良好とするための
洗浄工程、および乾燥工程が必要であり、製品までの所
要時間が長くなるという欠点があった。However, the polycarbonate resin alone has problems in weather resistance and scratch resistance. As a solution to this problem, secondary processing for forming a coating film is mainly performed to improve weather resistance and scratch resistance. However, in order to form this coating film, there is a residual stress reduction step (= annealing step) for removing molding strain to prevent whitening, cracking and cracking due to long-term fatigue during coating film formation, and adhesion of the coating film. In addition, a washing step and a drying step for improving the appearance and appearance are required, and there is a drawback that the time required for the product is long.
上記の工程の中で、アニール処理工程と乾燥工程とは
主に熱風型乾燥器が使用されている。熱風型乾燥器は、
埃・塵が発生し易く、これが成形品の表面に付着し、そ
のままでは塗装後の外観不良となり、また、残留応力低
減に長時間を要し、生産コストが高くなったり、処理能
力に限界が生じたりするものであった。Among the above steps, a hot air dryer is mainly used for the annealing step and the drying step. The hot air dryer is
Dust is likely to be generated, which adheres to the surface of the molded product, and if it is left as it is, it will result in poor appearance after painting, and it will take a long time to reduce residual stress, which will increase production costs and limit processing capacity. Or something that happened.
本発明者らは、特にアニール処理を短時間で行うこと
により、生産性を増大すると共に、結果として塵・埃が
発生しにくい方法について鋭意検討した結果、本発明を
完成させた。The inventors of the present invention have elaborated a method of increasing productivity by performing annealing treatment in a short period of time and hardly generating dust as a result. As a result, the present invention has been completed.
すなわち、本発明は、成形された熱可塑性樹脂成形品
を加熱処理して残留応力を低減する方法において、該成
形品の樹脂に有効な周波数を有する高周波誘電加熱によ
る加熱と熱風加熱を併用することを特徴とする短時間で
残留応力を低減した樹脂成形品の製造法である。更に、
本発明においては、該樹脂成形品がポリカーボネートを
主体とする樹脂製で、周波数108〜1011Hzの高周波誘電
加熱を使用すること、この成形品が自動車用ランプレン
ズであることからなる残留応力を低減した樹脂成形品の
製造法である。That is, the present invention provides a method for reducing the residual stress by heat-treating a molded thermoplastic resin molded article, wherein both the heating by high-frequency dielectric heating and the hot air heating having an effective frequency for the resin of the molded article are used. This is a method for producing a resin molded product in which residual stress is reduced in a short time. Furthermore,
In the present invention, the resin molded article is made of a resin mainly composed of polycarbonate, and uses high-frequency dielectric heating at a frequency of 10 8 to 10 11 Hz. This is a method for producing a resin molded product in which is reduced.
以下、本発明の構成について説明する。 Hereinafter, the configuration of the present invention will be described.
本発明の成形品とは、樹脂製であれば特に限定されな
いものであり、広く熱可塑性樹脂で適用可能であり、単
独、２種以上の樹脂を配合してなる樹脂組成物、さらに
充填剤、強化材などを配合した組成物など適宜使用でき
るものである。さらに、成形品の形状は特に限定されな
いものであるが、従来のアニール法によって残留歪み除
去に特に時間のかかりやすい肉厚の厚い成形品に好適に
適用できるものである。ここに、本発明の熱可塑性樹脂
としては、例えばポリ塩化ビニル;PMMAなどのアクリル
樹脂;PS、HIPSなどのポリスチレン樹脂;ABS、AAS、MA
S、MEBSなどのポリスチレンとアクリル酸エステルやア
クリロニトリルなどとの共重合樹脂;PP、PE、TPX、その
他のポリオレフィン類；ホモ乃至コーポリアセタール樹
脂；ナイロン６、66、610、12、MXDA、その他の結晶性
乃至非結晶性ポリアミド樹脂;PBT、PET、PCTG、PCT
A、、ベクトラ、その他の結晶性、非結晶性乃至液晶性
のポリエステル樹脂；芳香族ポリカーボネート（PC）、
ポリフェニレンエーテル（PPE）、ポリフェニレンサル
ファイド（PPS）、ポリスルホン、ポリエーテルエーテ
ルケトン（PEEK）などのエンジニアリングプラスチック
などが挙げられ、これらは単独、２種以上を混合してな
る樹脂組成物、さらに耐衝撃性改良材として種々の熱可
塑性乃至粒子状のエラストマーを配合したもの、種々の
繊維、粉末、球、鱗片、板、テトラポット、髭などの種
々の形状の充填材または強化材を配合した組成物として
も好適に使用できるものとして例示される。これらの中
で、特に射出成形において残留歪みが生じやすい高分子
量の汎用樹脂、汎用エンジニアリングプラスチック、エ
ンジニアリングプラスチック、超耐熱性のエンジニアリ
ングプラスチックなど、並びにこれらに充填材または強
化材を配合した組成物が本発明の製造法を適用するのに
好適な樹脂として挙げられる。The molded article of the present invention is not particularly limited as long as it is made of a resin, is widely applicable to a thermoplastic resin, and is a resin composition obtained by blending two or more resins alone, further, a filler, A composition containing a reinforcing material or the like can be appropriately used. Furthermore, although the shape of the molded product is not particularly limited, it can be suitably applied to a thick molded product which tends to take a particularly long time to remove residual strain by a conventional annealing method. Here, as the thermoplastic resin of the present invention, for example, polyvinyl chloride; acrylic resin such as PMMA; PS, polystyrene resin such as HIPS; ABS, AAS, MA
Copolymer resin of polystyrene such as S, MEBS, etc. with acrylic acid ester or acrylonitrile; PP, PE, TPX, other polyolefins; homo or copolyacetal resin; nylon 6, 66, 610, 12, MXDA, other crystals Crystalline or non-crystalline polyamide resin; PBT, PET, PCTG, PCT
A, Vectra and other crystalline, non-crystalline to liquid crystalline polyester resins; aromatic polycarbonate (PC),
Engineering plastics such as polyphenylene ether (PPE), polyphenylene sulfide (PPS), polysulfone, and polyetheretherketone (PEEK); these are resin compositions composed of a mixture of two or more, and impact resistance As a composition in which various thermoplastic or particulate elastomers are compounded as an improving material, various fibers, powders, spheres, scales, plates, tetrapots, whiskers, etc. Are also preferably used. Among these, high-molecular-weight general-purpose resins, general-purpose engineering plastics, engineering plastics, ultra-heat-resistant engineering plastics, etc., which are liable to cause residual distortion in injection molding, etc. It is mentioned as a resin suitable for applying the production method of the invention.
次に、本発明の製造法を実施する方法は、該成形品の
樹脂に有効な周波数を有する高周波誘電加熱装置中で成
形品を該成形品に従来使用していたアニール温度程度に
急速に加熱し、保持することによるものである。Next, the method for carrying out the production method of the present invention includes the steps of rapidly heating the molded article to a temperature around the annealing temperature conventionally used for the molded article in a high-frequency dielectric heating apparatus having an effective frequency for the resin of the molded article. And holding it.
加熱に用いる有効な周波数は、樹脂の種類、その添加
物などにより異なるものであり、適宜、用いた成形品に
応じて最適な周波数を選択する。The effective frequency used for heating varies depending on the type of resin, its additive, and the like, and an optimal frequency is appropriately selected according to the molded article used.
例えば、ポリカーボネート樹脂単独或いはポリカーボ
ネート樹脂を主体とする樹脂成形品の場合には、周波数
108〜1011Hzの高周波誘電加熱が好適なものとして選択
され、加熱温度は、それぞれの樹脂に応じた従来公知の
アニール温度となるようにすればよく、例えばポリカー
ボネート樹脂成形品では約120〜130℃程度の範囲から適
宜選択する。For example, in the case of a polycarbonate resin alone or a resin molded product mainly composed of a polycarbonate resin, the frequency
High-frequency dielectric heating of 10 8 to 10 11 Hz is selected as a suitable one, and the heating temperature may be set to a conventionally known annealing temperature corresponding to each resin. It is appropriately selected from the range of about 130 ° C.
また、本発明の方法をより効率良く実施するため、局
部加熱を防止する為に、従来の熱風加熱を併用すること
が好適である。これは、周囲温度が低いと、成形品の表
面が冷却され、歪み除去効果が小さくなることを防止す
る。さらに付着或いは吸収水、その他の原因によって局
部加熱などが生じ、局部的に表面が荒れたり、発泡した
りすることを防止し、急速に均一に所望温度とし、短時
間により低レベルの残留応力とした成形品をより短時間
で製造することを可能とする。この結果、例えばポリカ
ーボネート成形品の場合、好適な条件を用いれば、数分
以内で残留歪みを除くことが可能となるばかりでなく、
水分等が多少残留した場合にも成形品が発泡などして劣
化することを防止することが可能となるものである。な
お、本発明においては、高周波誘電加熱を用いるにあた
って、水分を十分除いた乾燥された樹脂成形品を用いる
ことがより好ましい。この点から成形品が吸湿などする
前に、例えば、射出成形後、直ちに本発明の製造法を適
用することが好ましい。Further, in order to carry out the method of the present invention more efficiently, it is preferable to use conventional hot air heating in combination to prevent local heating. This prevents the surface of the molded article from cooling when the ambient temperature is low, and prevents the effect of removing distortion from being reduced. In addition, local heating or the like is caused by adhesion or absorbed water, or other causes, preventing the surface from being locally roughened or foamed, and quickly and uniformly to a desired temperature. It is possible to produce a molded article in a shorter time. As a result, for example, in the case of a polycarbonate molded article, if suitable conditions are used, not only can residual strain be removed within several minutes, but also
Even if a small amount of moisture or the like remains, it is possible to prevent the molded article from deteriorating due to foaming or the like. In the present invention, in using high-frequency dielectric heating, it is more preferable to use a dried resin molded product from which moisture has been sufficiently removed. From this point, it is preferable to apply the production method of the present invention immediately before the molded article absorbs moisture, for example, after injection molding.
以下、実施例および比較例によって具体的に説明す
る。Hereinafter, the present invention will be described specifically with reference to Examples and Comparative Examples.
実施例１および比較例１ ポリカーボネート樹脂（三菱瓦斯化学（株）製、商品
名；ユーピロン S 2000）を用いて、高射出・高保持圧
力にて3mm×100mm×150mmの残留応力の残った角板を製
造した。Example 1 and Comparative Example 1 Using a polycarbonate resin (trade name: Iupilon S2000, manufactured by Mitsubishi Gas Chemical Co., Ltd.), a square plate having a residual stress of 3 mm × 100 mm × 150 mm under high injection and high holding pressure. Was manufactured.
この角板を用い、加熱装置として東芝（株）製の電子
レンジER−250（周波数2450MHz:500W）に、高周波の洩
れがないように熱風流路を設けた装置を用い、残留応力
の除去状況を調べた。結果を第１表に記載した。なお、
熱風併用の場合の熱風ヒーター温度は120℃とした。This square plate was used as a heating device in a microwave oven ER-250 (frequency: 2450 MHz: 500 W) manufactured by Toshiba Corporation with a device provided with a hot air flow path to prevent high-frequency leakage. Was examined. The results are shown in Table 1. In addition,
The hot air heater temperature in the case of using hot air together was 120 ° C.
また、残留応力の測定は、四塩化炭素とｎ−ブタノー
ルとの混合溶媒中に於ける成形品のクラック発生限界応
力から求めた。In addition, the residual stress was measured from the crack generation limit stress of a molded article in a mixed solvent of carbon tetrachloride and n-butanol.
第１表の結果から、高周波誘電加熱と熱風ヒーターに
よる熱風加熱或いは保温を併用した場合、僅か２分間の
処理で残留応力としては実質的に問題とならない40kg/c
m2以下の値となる。 From the results in Table 1, it is found that when both high-frequency dielectric heating and hot-air heating or heat retention by a hot-air heater are used in combination, only 2 minutes of treatment causes no substantial problem as residual stress at 40 kg / c.
m 2 or less.
なお、この高周波誘電加熱の場合、単独では水などが
成形品に残っていると局部加熱、又はそれらによる加水
分解反応を起こす場合があり、乾燥された成形品を用い
ることが必要なことが分る。In the case of this high-frequency dielectric heating, if water or the like is left alone in the molded article, local heating or a hydrolysis reaction due to them may occur, and it is necessary to use a dried molded article. You.
比較例２ 従来の熱風循環式乾燥器のみを用いる他は実施例１と
同様にした結果を第２表に示した。Comparative Example 2 Table 2 shows the results obtained in the same manner as in Example 1 except that only the conventional hot air circulation type dryer was used.
第２表の結果から、従来の熱風加熱単独の場合、残留
応力としては実質的に問題とならない40kg/cm2以下の値
となるには約60分間の処理が必要なことが分る。なお、
成形品の内部が120℃に達するまでの時間は約30分間で
あった。 From the results shown in Table 2, it can be seen that in the case of conventional hot air heating alone, a treatment for about 60 minutes is required to obtain a residual stress of 40 kg / cm 2 or less, which does not substantially cause a problem. In addition,
The time required for the inside of the molded article to reach 120 ° C. was about 30 minutes.
実施例２および比較例３ ポリカーボネート樹脂（三菱瓦斯化学（株）製、商品
名；ユーピロン S 2000）を用いて、肉厚2.5mm、縦100m
m、横200mm、高さ75mmの升型成形品を製造した。Example 2 and Comparative Example 3 A polycarbonate resin (trade name: Iupilon S2000, manufactured by Mitsubishi Gas Chemical Co., Ltd.) was used.
m, 200 mm wide and 75 mm high were manufactured.
この成形品を用いる他は実施例１と同様にした結果を
第３表に示した。The results are shown in Table 3 in the same manner as in Example 1 except that this molded article was used.
第３表の結果から、高周波誘電加熱と熱風ヒーターに
よる熱風加熱或いは保温を併用した場合、僅か３分間の
処理で残留応力としては実質的に問題とならない40kg/c
m2以下の値となる。 From the results in Table 3, when high-frequency dielectric heating and hot-air heating or heat retention by a hot-air heater are used in combination, the residual stress is practically 40 kg / c after only 3 minutes of treatment.
m 2 or less.
なお、この高周波誘電加熱の場合、単独では水などが
成形品に残っていると局部加熱、又はそれらによる加水
分解反応を起こす場合があり、乾燥された成形品を用い
ることが必要なことが分る。In the case of this high-frequency dielectric heating, if water or the like is left alone in the molded article, local heating or a hydrolysis reaction due to them may occur, and it is necessary to use a dried molded article. You.
〔発明の作用および効果〕 以上、発明の詳細な説明および実施例、比較例から明
瞭なように、本発明の残留応力を除去した成形品の製造
法によれば、従来に比較して極めて短時間で残留応力が
除去可能であり、比較的高価な高周波誘電加熱を使用し
ても十分に、その製造コストの低減を図ることが可能で
あることが理解される。又、処理時間の極端な短縮に伴
い、塵・埃等による成形品表面の汚れも大幅に解消され
たものとなり、その工業的意義は極めて高いものであ
る。[Operation and Effect of the Invention] As described above, as is clear from the detailed description of the invention, the examples, and the comparative examples, according to the method for manufacturing a molded product from which residual stress has been removed according to the present invention, an extremely short It is understood that the residual stress can be removed in a short time, and the production cost can be sufficiently reduced even by using relatively expensive high-frequency dielectric heating. Further, with the extremely shortened processing time, dirt on the surface of the molded article due to dust and dirt has been largely eliminated, and its industrial significance is extremely high.
フロントページの続き (72)発明者 貞野 力 神奈川県平塚市東八幡５丁目６番２号 三菱瓦斯化学株式会社プラスチックセン ター内 審査官 綿谷 晶廣 (56)参考文献 特開 昭64−87334（ＪＰ，Ａ) 特開 平１−320140（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) B29C 71/00 - 71/02 Continuation of the front page (72) Inventor Tsutomu Sadano 5-6-1, Higashi-Hachiman, Hiratsuka-shi, Kanagawa Examiner, Plastic Center, Mitsubishi Gas Chemical Co., Ltd. Akihiro Wataya (56) References JP-A-64-87334 (JP) , A) JP-A-1-320140 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) B29C 71/00-71/02
Claims (3)
して残留応力を低減する方法において、該成形品の樹脂
に有効な高周波誘電加熱と熱風加熱を併用することを特
徴とする短時間で残留応力を低減した樹脂成形品の製造
法。1. A method for heat-treating a molded thermoplastic resin article to reduce residual stress, wherein both high-frequency dielectric heating and hot-air heating effective for the resin of the molded article are used. Method for manufacturing resin molded products with reduced residual stress.
する樹脂製で、周波数108〜1011Hzの高周波誘電加熱で
ある請求項１記載の樹脂成形品の製造法。2. The method for producing a resin molded article according to claim 1, wherein said resin molded article is made of a resin mainly composed of polycarbonate, and is high-frequency dielectric heating at a frequency of 10 8 to 10 11 Hz.
請求項２記載の樹脂成形品の製造法。3. The method for producing a resin molded product according to claim 2, wherein said molded product is a lamp lens for an automobile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9405590A JP2917391B2 (en) | 1990-04-11 | 1990-04-11 | Manufacturing method of resin molded products with reduced residual stress |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9405590A JP2917391B2 (en) | 1990-04-11 | 1990-04-11 | Manufacturing method of resin molded products with reduced residual stress |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03293118A JPH03293118A (en) | 1991-12-24 |
| JP2917391B2 true JP2917391B2 (en) | 1999-07-12 |
Family
ID=14099861
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9405590A Expired - Lifetime JP2917391B2 (en) | 1990-04-11 | 1990-04-11 | Manufacturing method of resin molded products with reduced residual stress |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2917391B2 (en) |
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|---|---|---|---|---|
| EP3184577A1 (en) | 2015-12-23 | 2017-06-28 | Ems-Patent Ag | Method and container for storing and transporting polyamide pellets and correspondingly stored or transported polyamide pellets and shaped articles obtained therefrom |
| JP6923887B2 (en) * | 2018-02-13 | 2021-08-25 | 日立Astemo株式会社 | Method for Producing Thermoplastic Resin Composition and Thermoplastic Resin Composition |
-
1990
- 1990-04-11 JP JP9405590A patent/JP2917391B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20150125901A (en) * | 2014-04-30 | 2015-11-10 | 한일이화 주식회사 | Manufacturing apparatus and method of interior for vehicle |
| KR101666510B1 (en) * | 2014-04-30 | 2016-10-18 | 주식회사 서연이화 | Manufacturing apparatus and method of interior for vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03293118A (en) | 1991-12-24 |
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