JP2811231B2 - Thermoplastic polyester resin composition used for resin-coated steel sheet for drawn and ironed can, resin-coated steel sheet for drawn and ironed can, and drawn and ironed can - Google Patents
Thermoplastic polyester resin composition used for resin-coated steel sheet for drawn and ironed can, resin-coated steel sheet for drawn and ironed can, and drawn and ironed canInfo
- Publication number
- JP2811231B2 JP2811231B2 JP2307599A JP30759990A JP2811231B2 JP 2811231 B2 JP2811231 B2 JP 2811231B2 JP 2307599 A JP2307599 A JP 2307599A JP 30759990 A JP30759990 A JP 30759990A JP 2811231 B2 JP2811231 B2 JP 2811231B2
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- Prior art keywords
- resin
- drawn
- ironed
- steel sheet
- coated steel
- 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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- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Laminated Bodies (AREA)
- Polyesters Or Polycarbonates (AREA)
- Other Resins Obtained By Reactions Not Involving Carbon-To-Carbon Unsaturated Bonds (AREA)
- Paints Or Removers (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、絞りしごき缶用樹脂被覆鋼板に使用する熱
可塑性ポリエステル樹脂組成物および絞りしごき缶用樹
脂被覆鋼板および絞りしごき缶に関するものである。Description: TECHNICAL FIELD The present invention relates to a thermoplastic polyester resin composition used for a resin-coated steel sheet for drawn and ironed cans, a resin-coated steel sheet for drawn and ironed cans, and a drawn and ironed can. .
（従来の技術） 従来、絞りしごきに対する加工性に顕著に優れてお
り、内面に樹脂被覆を備えた状態で、しごき率が60％以
上の高度のしごき率でのしごき加工が可能となると共
に、絞りしごき加工により、樹脂被膜の密着性、耐腐食
性および外観特性に優れた絞りしごき缶を得ることがで
きる絞りしごき缶用樹脂被覆鋼板が、特開昭60−168643
号公報に提案されている。(Prior art) Conventionally, it is remarkably excellent in workability against drawing and ironing, and it is possible to perform ironing at a high ironing rate of 60% or more with a resin coating on the inner surface, By drawing and ironing, a resin-coated steel sheet for drawn and ironed cans capable of obtaining drawn and ironed cans having excellent adhesion, corrosion resistance and appearance properties of the resin film is disclosed in Japanese Patent Application Laid-Open No. 60-166863.
No. 1993.
その提案内容は、絞りしごき缶としたとき内側となる
べき最表面に配向可能で、且つ腐食成分に対してバリヤ
ー性を有するポリエチレンテレフタレート樹脂等の熱可
塑性樹脂の被覆層と、この被覆層の下に密着下地となる
クロム水和酸化物等の無機酸化物被覆層を有し、且つ絞
りしごき缶としたとき外側となるべき面にSn等の展延性
金属のメッキ層を有することを特徴とする絞りしごき缶
用樹脂被覆鋼板である。The proposal consists of a coating layer of a thermoplastic resin, such as polyethylene terephthalate resin, which can be oriented on the outermost surface to be the inside when drawn and ironed and has a barrier property against corrosive components. It has an inorganic oxide coating layer such as chromium hydrated oxide that serves as an adhesion base, and has a plating layer of a spreadable metal such as Sn on the surface that should be the outside when drawn and ironed. It is a resin-coated steel plate for drawing and ironing cans.
（発明が解決しようとする課題） このような絞りしごき缶用樹脂被覆鋼板を絞りしごき
成形して、樹脂被膜の密着性，耐腐食性および外観特性
に優れた絞りしごき缶を得るためには、同公報に明記さ
れるように、絞りしごき加工に際して、絞りしごき缶用
樹脂被覆鋼板の被覆樹脂を適正延伸温度（樹脂の結晶化
温度よりも低く、且つガラス転移温度（Tg）±30℃以内
の温度、たとえば樹脂がPET樹脂の場合、40〜100℃）に
する必要があり、一方、公知のエキストルージョンラミ
ネーション法等で製造され、絞りしごき工程に供せられ
る絞りしごき缶用樹脂被覆鋼板は通常、常温であるた
め、従来の製缶工程に樹脂被覆鋼板の予熱工程を付加し
なければならないという問題点がある。(Problems to be Solved by the Invention) In order to obtain a drawn and ironed can excellent in adhesion, corrosion resistance and appearance characteristics of the resin film by drawing and ironing such a resin-coated steel sheet for a drawn and ironed can, As specified in the same gazette, during drawing and ironing, the coated resin of the resin-coated steel sheet for drawn and ironed cans is drawn at an appropriate stretching temperature (lower than the crystallization temperature of the resin and at a glass transition temperature (Tg) within ± 30 ° C). Temperature, for example, 40 to 100 ° C. when the resin is PET resin). On the other hand, a resin-coated steel sheet for a drawn ironing can manufactured by a known extrusion lamination method or the like and subjected to a drawing ironing process is usually used. At room temperature, there is a problem that a preheating step of a resin-coated steel sheet must be added to the conventional can-making step.
本発明は、樹脂被覆鋼板を予熱することなく常温のま
ま絞りしごぎ加工に供しても、絞りしごきに対する加工
性に顕著に優れており、内面に樹脂被覆を備えた状態
で、しごき率が60％以上の高度のしごき率でのしごき加
工が可能となると共に、樹脂被膜の密着性、耐腐食性に
優れた絞りしごき缶を得ることができる絞りしごき缶用
樹脂被覆鋼板を確保できる熱可塑性ポリエステル樹脂組
成物を提供するものである。The present invention, even when subjected to drawing and ironing at room temperature without preheating the resin-coated steel sheet, is remarkably excellent in workability against drawing and ironing, and with the resin coating on the inner surface, the ironing rate is reduced. Thermoplasticity that enables ironing at a high ironing rate of 60% or more, and secures a resin-coated steel sheet for drawn and ironed cans that can obtain drawn and ironed cans with excellent adhesion and corrosion resistance of resin coating. A polyester resin composition is provided.
また上記特性を有する絞りしごき缶用樹脂被覆鋼板お
よび絞りしごき缶を提供するものである。Another object of the present invention is to provide a resin-coated steel sheet for drawn and ironed cans and a drawn and ironed can having the above characteristics.
（課題を解決するための手段） 本発明の要旨は次の通りである。(Means for Solving the Problems) The gist of the present invention is as follows.
（１） 結晶性ポリエステル95〜5wt％と非晶性ポリエ
ステル５〜95wt％とを熱溶融反応させ、下記式で定義さ
れるアロイ化率を５〜50％としたことを特徴とする絞り
しごき缶用樹脂被覆鋼板に使用する熱可塑性ポリエステ
ル樹脂組成物。(1) A drawing and ironing can characterized in that a crystalline polyester of 95 to 5 wt% and a non-crystalline polyester of 5 to 95 wt% are subjected to a heat melting reaction, and the alloying ratio defined by the following formula is set to 5 to 50%. Thermoplastic polyester resin composition used for resin-coated steel sheet.
Tm1又はTg1:原料の結晶性ポリエステル樹脂の融点又は
ガラス転移温度 Tm2又はTg2:原料の結晶性ポリエステル樹脂と非晶性ポ
リエステル樹脂を完全熱溶融反応させた時の融点又はガ
ラス転移温度、即ち同じモノマー組成をもつランダム共
重合体ポリエステル樹脂の融点又はガラス転移温度 Tm3又はTg3:熱可塑性ポリエステル樹脂組成物の融点又
はガラス転移温度 （２） 片面にSnめっきを、他面にクロメート処理を施
した鋼板のクロメート処理面上に、前項（１）の熱可塑
性ポリエステル樹脂組成物を被覆したことを特徴とする
絞りしごき缶用樹脂被覆鋼板。 T m1 or T g1 : Melting point or glass transition temperature of the raw material crystalline polyester resin T m2 or T g2 : Melting point or glass transition temperature when the raw material crystalline polyester resin and amorphous polyester resin are completely hot-melted That is, the melting point or glass transition temperature Tm3 or Tg3 of the random copolymer polyester resin having the same monomer composition: the melting point or glass transition temperature of the thermoplastic polyester resin composition (2) Sn plating on one side and chromate on the other side A resin-coated steel sheet for drawn and ironed cans, characterized in that the treated steel sheet is coated with the thermoplastic polyester resin composition of (1) above on the chromate-treated surface.
（３） 前項（２）の絞りしごき缶用樹脂被覆鋼板の樹
脂組成物被覆面が缶内面に、Snめっき面が缶外面になる
ように絞りしごき加工したことを特徴とする絞りしごき
缶。(3) A drawn and ironed can characterized by being drawn and ironed such that the resin composition-coated surface of the resin-coated steel sheet for drawn and ironed cans of the preceding paragraph (2) is on the inner surface of the can and the Sn-plated surface is on the outer surface of the can.
上記Tm1,Tm2,Tm3又はTg1,Tg2,Tg3は示差熱分析計（Pe
rkin Elmer−７型）を用いて10℃／分で昇温して得られ
る融点又はガラス転移温度である。また、結晶性、非晶
性の区別は、示差熱分析計を用いて同様の方法で融点の
ピークが発現するものを結晶性ポリエステル、またガラ
ス転移温度のみ発現するものあるいはガラス転移温度お
よび融点のピークが現れないものを非晶性ポリエステル
という。The above Tm1 , Tm2 , Tm3 or Tg1 , Tg2 , Tg3 are differential thermal analyzers (Pe
rkin Elmer-7 type) at 10 ° C./min. In addition, the distinction between crystalline and non-crystalline is achieved by using a differential thermal analyzer in the same manner as that of a crystalline polyester, and a polyester that develops only a glass transition temperature or a glass transition temperature or melting point. Those in which no peak appears are called amorphous polyester.
上記結晶性ポリエステルとは、ポリエチレンテレフタ
レート（以下、PETと略す）、ポリブチレンテレフタレ
ート（以下、PBTと略す）、ポリエチレンナフタレート
（以下、PENと略す）およびその共重合体が例として挙
げられるが、これらに限定するものではなく少なくとも
融点が200℃以上の熱可塑性ポリエステルを言う。Examples of the crystalline polyester include polyethylene terephthalate (hereinafter abbreviated as PET), polybutylene terephthalate (hereinafter abbreviated as PBT), polyethylene naphthalate (hereinafter abbreviated as PEN), and copolymers thereof. It is not limited to these, but refers to a thermoplastic polyester having a melting point of at least 200 ° C.
上記非晶性ポリエステルとは、ポリエチレンイソフタ
レート（以下、PEIと略す）、シクロヘキサン・ジメタ
ノール30mol％のポリエチレンテレフタレートコポリエ
ステル、イソフタール酸20mol％以上のポリエチレンテ
レフタレート、ポリアリレート、ポリエステルポリカー
ボネート等が例として挙げられるが、これらに限定する
ものではなく、ガラス転移点が20℃以上、好ましくは40
℃以上の非晶性の熱可塑性ポリエステルを言う。Examples of the amorphous polyester include polyethylene isophthalate (hereinafter abbreviated as PEI), polyethylene terephthalate copolyester of 30 mol% of cyclohexane / dimethanol, polyethylene terephthalate of 20 mol% or more of isophthalic acid, polyarylate, polyester polycarbonate and the like. However, the glass transition point is not limited to these, but is not limited thereto, preferably 40 ° C or more.
It refers to an amorphous thermoplastic polyester having a temperature of at least ° C.
以下、本発明の内容を更に詳しく説明する。 Hereinafter, the contents of the present invention will be described in more detail.
本発明者等は缶外面となる側にSnめっきを、缶内面と
なる側にクロメート処理を施した公知の表面処理鋼板の
クロメート処理面に公知の方法で各種の熱可塑性樹脂を
被覆し、缶内面が常温の樹脂被覆面になるようにして絞
りしごき加工を行って缶を製造した。The present inventors coated Sn coating on the side to be the outer surface of the can and various thermoplastic resins on the chromate-treated surface of a known surface-treated steel sheet subjected to chromate treatment on the side to be the inner surface of the can by a known method, A can was manufactured by drawing and ironing such that the inner surface became a resin-coated surface at room temperature.
先ず、本発明者等は熱可塑性樹脂として、公知のPET
を選択し、更に、これも公知の非晶質の状態の樹脂を使
用した。しかし、公知の方法に従って製造した常温の樹
脂被覆鋼板は、軽度な絞りしごき加工には耐えても、本
発明者等が目標とする60％以上のしごきには耐えられな
いものであった。この理由について検討した結果、通常
の非晶質PETを用いただけでは、絞りしごき加工の途中
で樹脂が加工される過程で当初非晶質であったPETが加
工により一部晶質化し、引続き行われる加工には晶質化
しているために耐えられないと考えた。そこで本発明者
等は、晶質化しないポリエステル樹脂として、PEIを用
いて同じ加工を行った。このPEIは、非晶質であるため
予想した通り絞り加工には優れた特性を示したが、引続
き行われるしごき加工は、樹脂が加工用のポンチ（しご
き加工は、通常３個のダイス間に金属をポンチで押し込
み、ポンチ／ダイス間でしごき加工される）に付着し缶
内面から樹脂が剥離するとともに、缶体をポンチから取
り外す（ストリツプアウトと言われる）ことができなか
つた。その他、グリコール成分を変更したポリイソブチ
レンテレフタレート（PIBTと略す）を使用したり、PET,
PEI、更にPBT等の混合物を使用して同じ絞りしごき加工
を行ったが、満足できる結果を得られなかった。即ち結
晶化樹脂の成分が多い時は加工性に劣り、非晶質樹脂の
成分が多い時はストリップアウト性が悪く、これら三成
分を適宜混合した範囲では、加工性、ストリップアウト
性の両方を満足するものは得られなかった。First, the present inventors, as a thermoplastic resin, known PET
And a resin in a known amorphous state was used. However, a normal temperature resin-coated steel sheet manufactured according to a known method was not able to withstand the 60% or more ironing targeted by the present inventors, even though it could withstand mild drawing and ironing. As a result of studying the reason for this, only ordinary amorphous PET was used, and in the process of processing the resin during drawing and ironing processing, the amorphous PET was partially crystallized by processing and continued to be processed. It was thought that it was unbearable due to the crystallinity of the process. Then, the present inventors performed the same processing using PEI as a polyester resin which does not crystallize. As expected, this PEI exhibited excellent properties in drawing as expected because of its amorphous nature. However, in the subsequent ironing process, the resin was a punch for processing (ironing is usually performed between three dies). The metal was pressed with a punch and ironed between the punch and the die), adhered to the inner surface of the can, and the resin was peeled off, and the can body could not be removed from the punch (called strip-out). In addition, use of polyisobutylene terephthalate (abbreviated as PIBT) with a modified glycol component, PET,
The same drawing and ironing was performed using a mixture of PEI and further PBT, but no satisfactory results were obtained. That is, when the content of the crystallized resin is large, the processability is poor, and when the content of the amorphous resin is large, the strip-out property is poor. I wasn't satisfied.
次に、本発明者等はPET,PEIの単独組成では勿論のこ
と、単に混合したのみでは樹脂溶融時に一部エステル交
換反応が起こるとしても、それぞれ単味の特性が現れて
いると考え、本発明者等は、テレフタレートとイソフタ
レートとの共重合体樹脂を作成し、同様の試験に供した
が満足のいく結果は得られなかった。しかし、このテレ
フタレートとイソフタレートとの共重合体樹脂を使用し
た試験で極めて限られた樹脂組成の範囲で、略目標に近
い特性が得られた。そこで、本発明者等は、得られた結
果を鋭意解析した結果、樹脂の結晶性を制御するだけで
は過酷な絞りしごき加工に耐えることはできず、樹脂の
融点についても制御することが肝要であるとの結論に至
った。すなわち、非晶質な状態で絞りしごき加工される
際に加工によって極力結晶化せず、且つ適当な温度範囲
に融点が存在する樹脂組成物が本発明の目的に適うこと
を見出した。この樹脂組成物を得る方法として、PETお
よびPEI、すなわち、結晶性ポリエステルと非晶性ポリ
エステルの好ましくは少なくとも一方が触媒活性を有し
ている状態で結晶性ポリエステル95〜5wt％と非晶性ポ
リエステル５〜95wt％とを熱溶融させアロイ化率を５〜
50％にコントロールした樹脂組成物が絞りしごき缶用の
樹脂被覆鋼板用の樹脂として優れたものであることを見
出した。ここで触媒活性を有している状態とは、原料ポ
リエステルを加熱した場合に、分子量（または極限粘
度）の上昇をもたらすものを指す。このような触媒活性
を有する原料を用いることによりアロイ化に要する時間
を短くすることができる。Next, the present inventors consider that, although not only a single composition of PET and PEI but also a simple transesterification occurs when the resin is melted by merely mixing, each of them has a single characteristic, The inventors have prepared a copolymer resin of terephthalate and isophthalate and have conducted similar tests, but no satisfactory results have been obtained. However, in a test using the copolymer resin of terephthalate and isophthalate, characteristics close to the target were obtained in a very limited range of the resin composition. Therefore, the present inventors have conducted a thorough analysis of the obtained results.As a result of controlling the crystallinity of the resin, it is not possible to endure severe drawing and ironing, and it is important to control the melting point of the resin. I came to the conclusion. That is, it has been found that a resin composition which does not crystallize as much as possible when drawing and ironing in an amorphous state and has a melting point in an appropriate temperature range is suitable for the purpose of the present invention. As a method for obtaining this resin composition, PET and PEI, that is, 95 to 5 wt% of the crystalline polyester and the amorphous polyester in a state where at least one of the crystalline polyester and the amorphous polyester preferably has a catalytic activity. 5 to 95 wt% by heat melting and alloying rate 5 to
It was found that the resin composition controlled at 50% was excellent as a resin for a resin-coated steel sheet for a drawn and ironed can. Here, the state having catalytic activity refers to a state in which the molecular weight (or intrinsic viscosity) increases when the raw material polyester is heated. The time required for alloying can be shortened by using a raw material having such a catalytic activity.
以下本発明の構成要件の限定理由について説明する。 Hereinafter, the reasons for limiting the constituent elements of the present invention will be described.
アロイ化率の限定理由はアロイ化率５％未満では、し
ごき加工等により発生する熱で晶質部分が増加し、被覆
樹脂が高しごき率に追随できない。また、アロイ化率が
50％を越えるものでは、被覆樹脂の見掛けの溶融温度が
低下し、ストリップアウト性を大きく悪化させるからで
ある。The reason for limiting the alloying rate is that if the alloying rate is less than 5%, the heat generated by ironing or the like increases the crystalline portion, and the coating resin cannot follow the high ironing rate. Also, the alloying rate
If it exceeds 50%, the apparent melting temperature of the coating resin decreases, and the strip-out property is greatly deteriorated.
結晶性ポリエステルと非晶性ポリエステルをアロイ化
するに当り、その混合比率を（非晶性ポリエステル÷ポ
リエステル樹脂全量×100）を５〜95％にした理由につ
いて以下説明する。The reason why the mixing ratio (amorphous polyester ÷ total amount of polyester resin × 100) in alloying the crystalline polyester and the amorphous polyester is 5 to 95% will be described below.
先ず、混合比率を５％以上としたのは、５％未満で
は、結晶性樹脂の影響が強く、厳しいしごき加工時、延
伸により樹脂が加工できない程晶質化するからである。
また上限を95％としたのは95％を越えると、見掛けの融
点が235℃以下となり、しごき加工時にポンチに融着
し、ストリップアウト性が著しく悪くなるからである。
実用上、しごき加工時の延伸性およびポンチ打抜き時の
ストリップアウト性のバランスの観点から、結晶性ポリ
エステルと非晶性ポリエステルとの混合比率を５〜95％
にしてアロイ化率を５〜50％になるようにした樹脂組成
物が絞りしごき缶用の樹脂被覆鋼板用樹脂として優れて
いるのである。First, the reason for setting the mixing ratio to 5% or more is that if the mixing ratio is less than 5%, the influence of the crystalline resin is so strong that the resin becomes too crystalline to be processed by stretching during severe ironing.
The reason why the upper limit is set to 95% is that if the upper limit exceeds 95%, the apparent melting point becomes 235 ° C. or less, which is fused to the punch at the time of ironing, and the strip-out property is significantly deteriorated.
In practice, the mixing ratio of crystalline polyester and amorphous polyester should be 5 to 95% from the viewpoint of balance between stretchability during ironing and strip-out during punching.
Thus, a resin composition having an alloying ratio of 5 to 50% is excellent as a resin for a resin-coated steel sheet for a drawn and ironed can.
（実施例） 以下、実施例に基づき本発明の内容を具体的に説明す
る。(Examples) Hereinafter, the contents of the present invention will be specifically described based on examples.
缶外面になる側にSn2.8g/m2のめっきを、缶内面とな
る側にクロメート処理（金属Cr55mg/m2、酸化Cr18mg/
m2）を施した鋼板（板厚み0.30mm、コードＴ−１相当）
のクロメート処理面に、Ｔダイを用いて、第１表に示し
た樹脂組成物を50μｍ被覆した。この時のＴダイでの樹
脂融解温度は、265〜300℃であり、被覆時の鋼板温度
は、150〜200℃であった。またＴダイで樹脂が被覆され
た鋼板は10秒以内に、100℃以下迄急冷した。なお急冷
した理由は、高温での樹脂の結晶化を防止するためであ
る。The plating Sn2.8g / m 2 on the side to be Kangaimen, chromate treatment on the side to be the inner surface of the can (metal Cr55mg / m 2, oxide Cr18mg /
m 2 ) treated steel sheet (thickness 0.30mm, code T-1 equivalent)
Was coated with 50 μm of the resin composition shown in Table 1 using a T-die. At this time, the resin melting temperature at the T-die was 265 to 300 ° C, and the temperature of the steel sheet at the time of coating was 150 to 200 ° C. The steel sheet coated with the resin by the T-die was rapidly cooled to 100 ° C. or less within 10 seconds. The reason for the rapid cooling is to prevent crystallization of the resin at a high temperature.
こうして得られた常温の樹脂被覆鋼板を、缶内面が樹
脂被覆面になるようにして下記の成形条件にて絞りしご
き加工を行って缶を製造し、缶内面（樹脂被覆面）の健
全性を評価するために、缶の中に1.0％食塩水を入れ、
缶体を陽極とし、缶中央部に設置した白金を陰極として
＋6Vの電圧をかけたときに流れる電流値を測定した（以
下、QTV試験と略す）。また同じく缶内面の健全性を評
価する目的で、缶の中に硫酸20g/、硫酸銅（CuSO47H2
O）50g/を含む溶液を入れ10分間放置し、液を除去、
水洗後に析出したCu（溶液はCuの化学めっき液で樹脂層
に欠陥があれば、欠陥部から鉄が溶出して、Cuが置換め
っきされる）を観察した（以下、硫酸銅試験と略す）。
これらの結果をストリップアウト性評価結果および絞り
しごき加工後の缶内面観察結果とともに第２表に示し
た。The room temperature resin-coated steel sheet thus obtained is drawn and ironed under the following molding conditions so that the inner surface of the can becomes the resin-coated surface to produce a can, and the soundness of the inner surface of the can (the resin-coated surface) is checked. For evaluation, put 1.0% saline in a can,
The current flowing when a voltage of +6 V was applied using the can body as an anode and platinum placed in the center of the can as a cathode was measured (hereinafter abbreviated as QTV test). Also, for the purpose of evaluating the soundness of the inner surface of the can, sulfuric acid 20 g / copper sulfate (CuSO 4 7H 2
O) Add a solution containing 50g / and leave it for 10 minutes to remove the solution,
Cu precipitated after washing with water (if the solution is a chemical plating solution of Cu and the resin layer has defects, iron is eluted from the defective parts and Cu is replaced and plated) (hereinafter abbreviated as copper sulfate test) .
These results are shown in Table 2 together with the evaluation results of the strip-out property and the results of observation of the inner surface of the can after drawing and ironing.
＜成形条件＞ 1.絞りしごき直前の樹脂温度：常温 2.ブランク径:137mmφ 3.絞り条件:1st絞り比 H/D＝33/86mmφ 2nd絞り比 H/D＝50/65mmφ 4.しごきポンチ径:3段アイアニング65.5mmφ 5.総しごき率:70.5％ （発明の効果） 以上説明したように本発明の熱可塑性ポリエステル樹
脂組成物を使用して得た絞りしごき缶用樹脂被覆鋼板
は、常温のまま絞りしごき加工に供しても、非常に優れ
た内面特性を持った絞りしごき缶が得られるので、従来
の熱可塑性樹脂を使用して得た絞りしごき缶用樹脂被覆
鋼板では必須とされる製缶メーカーでの絞りしごき缶用
樹脂被覆鋼板の予熱工程を省略することができ、缶製造
コストダウンが図れる。<Molding conditions> 1. Resin temperature just before drawing and ironing: normal temperature 2. Blank diameter: 137mmφ 3. Drawing condition: 1st drawing ratio H / D = 33 / 86mmφ 2nd drawing ratio H / D = 50 / 65mmφ 4. Ironing punch diameter : 3-stage ironing 65.5mmφ 5. Total ironing rate: 70.5% (Effect of the Invention) As described above, the resin-coated steel sheet for drawn and ironed cans obtained by using the thermoplastic polyester resin composition of the present invention has an extremely excellent inner surface even when subjected to drawing and ironing at room temperature. Pre-heating process of resin-coated steel sheets for drawn ironing cans, which is indispensable for can-manufacturers, required for conventional drawn-ironing cans that can be obtained using conventional thermoplastic resin because they can produce drawn ironed cans with characteristics Can be omitted, and can manufacturing cost can be reduced.
フロントページの続き (72)発明者 新美 宏二 山口県玖珂郡和木町和木６丁目１番２号 三井石油化学工業株式会社内 (72)発明者 平岡 孝之 山口県玖珂郡和木町和木６丁目１番２号 三井石油化学工業株式会社内 (56)参考文献 特開 平３−98844（ＪＰ，Ａ) 特開 平１−268768（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) C09D 167/02 C08G 63/91 C08G 81/00 B21D 22/20Continued on the front page (72) Inventor Koji Niimi 61-2, Waki, Waki-cho, Kuga-gun, Yamaguchi Prefecture Inside Mitsui Petrochemical Industry Co., Ltd. (72) Takayuki Hiraoka 6-Waki, Waki-cho, Kuga-gun, Yamaguchi Prefecture No. 1-2, Mitsui Petrochemical Industry Co., Ltd. (56) References JP-A-3-98844 (JP, A) JP-A-1-268768 (JP, A) (58) Fields investigated (Int. Cl. 6) , DB name) C09D 167/02 C08G 63/91 C08G 81/00 B21D 22/20
Claims (3)
リエステル５〜95wt％とを熱溶融反応させ、下記式で定
義されるアロイ化率を５〜50％としたことを特徴とする
絞りしごき缶用樹脂被覆鋼板に使用する熱可塑性ポリエ
ステル樹脂組成物。 Tm1又はTg1:原料の結晶性ポリエステル樹脂の融点又は
ガラス転移温度 Tm2又はTg2:原料の結晶性ポリエステル樹脂と非晶性ポ
リエステル樹脂を完全熱溶融反応させた時の融点又はガ
ラス転移温度、即ち同じモノマー組成をもつランダム共
重合体ポリエステル樹脂の融点又はガラス転移温度 Tm3又はTg3:熱可塑性ポリエステル樹脂組成物の融点又
はガラス転移温度1. A drawing method wherein 95 to 5% by weight of a crystalline polyester and 5 to 95% by weight of an amorphous polyester are subjected to a heat melting reaction, and an alloying ratio defined by the following formula is set to 5 to 50%. Thermoplastic polyester resin composition used for resin-coated steel sheets for ironing cans. T m1 or T g1 : Melting point or glass transition temperature of the raw material crystalline polyester resin T m2 or T g2 : Melting point or glass transition temperature when the raw material crystalline polyester resin and amorphous polyester resin are completely hot-melted That is, the melting point or glass transition temperature of the random copolymer polyester resin having the same monomer composition Tm3 or Tg3 : the melting point or glass transition temperature of the thermoplastic polyester resin composition
を施した鋼板のクロメート処理面上に、請求項（１）の
熱可塑性ポリエステル樹脂組成物を被覆したことを特徴
とする絞りしごき缶用樹脂被覆鋼板。2. A drawn ironing can, wherein the thermoplastic polyester resin composition according to claim 1 is coated on a chromate-treated surface of a steel plate having one surface coated with Sn plating and the other surface subjected to chromate treatment. For resin coated steel sheet.
板の樹脂組成物被覆面が缶内面に、Snめっき面が缶外面
になるように絞りしごき加工したことを特徴とする絞り
しごき缶。3. The drawing and ironing method according to claim 2, wherein the resin-coated steel sheet for a drawn and ironed can is drawn and ironed so that the surface coated with the resin composition is on the inner surface of the can and the Sn-plated surface is on the outer surface of the can. can.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2307599A JP2811231B2 (en) | 1989-11-15 | 1990-11-14 | Thermoplastic polyester resin composition used for resin-coated steel sheet for drawn and ironed can, resin-coated steel sheet for drawn and ironed can, and drawn and ironed can |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29645089 | 1989-11-15 | ||
| JP1-296450 | 1989-11-15 | ||
| JP2307599A JP2811231B2 (en) | 1989-11-15 | 1990-11-14 | Thermoplastic polyester resin composition used for resin-coated steel sheet for drawn and ironed can, resin-coated steel sheet for drawn and ironed can, and drawn and ironed can |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03269074A JPH03269074A (en) | 1991-11-29 |
| JP2811231B2 true JP2811231B2 (en) | 1998-10-15 |
Family
ID=26560679
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2307599A Expired - Lifetime JP2811231B2 (en) | 1989-11-15 | 1990-11-14 | Thermoplastic polyester resin composition used for resin-coated steel sheet for drawn and ironed can, resin-coated steel sheet for drawn and ironed can, and drawn and ironed can |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2811231B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5326207B2 (en) * | 2006-12-15 | 2013-10-30 | 東洋紡株式会社 | Coating composition, laminate and flexible flat cable |
-
1990
- 1990-11-14 JP JP2307599A patent/JP2811231B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03269074A (en) | 1991-11-29 |
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