JPS6138014B2 - - Google Patents
Info
- Publication number
- JPS6138014B2 JPS6138014B2 JP15575379A JP15575379A JPS6138014B2 JP S6138014 B2 JPS6138014 B2 JP S6138014B2 JP 15575379 A JP15575379 A JP 15575379A JP 15575379 A JP15575379 A JP 15575379A JP S6138014 B2 JPS6138014 B2 JP S6138014B2
- Authority
- JP
- Japan
- Prior art keywords
- polyethylene terephthalate
- terephthalate resin
- stretching
- band
- machine
- 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
Links
- 239000011347 resin Substances 0.000 claims description 20
- 229920005989 resin Polymers 0.000 claims description 20
- -1 polyethylene terephthalate Polymers 0.000 claims description 18
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 18
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 18
- 239000004744 fabric Substances 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 2
- 238000007789 sealing Methods 0.000 description 5
- 238000005336 cracking Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 2
- 238000009998 heat setting Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004049 embossing Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
Landscapes
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Description
本発明はポリエチレンテレフタレート樹脂製バ
ンドの製造方に関する。
重量の大きい重梱包品の結束帯として天然繊維
や合成繊維を加工した結束帯、あるいは鋼鉄製の
結束帯がある。前者は結束後の応力緩和による荷
くずれ、張力や結節強力不足による切断等の欠点
があり、後者は腐蝕の問題や解梱包の際等危険性
の問題があつた。
そこで、これらに代わる結束帯として、ポリエ
チレンテレフタレート樹脂製のバンドが考えられ
た。従来のポリエチレンテレフタレート樹脂製の
バンドは、主に一段延伸成型されており、又原材
料として固有粘度（IV値）0.90以下のポリエチレ
ンテレフタレート樹脂が用いられており次の各欠
点を有する。
(a)強度が不足する。(b)ヒートシール強度が小さ
くヒートシールにばらつきが多い。(c)高温におけ
る収縮率が大きく高温な場所での使用ができな
い。(d)耐候性が劣る。
等の欠点である。
ポリエチレンテレフタレート樹脂の二段延伸成
型は過去に何件か提唱されているが、フイルムの
透明度を出すことをねらいとしたものが多く、前
記と同様な欠点の他にたて割れする等の欠点があ
る。
発明者は、従来のポリエチレンテレフタレート
樹脂製バンドが上記のような多くの欠点を有する
のは、樹脂粘度の問題と成型条件であることに着
目し本発明の創作に至つた。特に長期間屋外放置
したり、50℃〜80℃の高温な場所でも長期間放置
に耐え得ると共に、大きくかつばらつきの少ない
ヒートシール強度及び素材強度を有するポリエチ
レンテレフタレート樹脂製バンドの製造方法を提
供することを目的としている。
以下本発明ポリエチレンテレフタレート樹脂製
バンドの製造方法につき詳細に説明する。
原材料として固有粘度（IV値）0.95〜1.15のポ
リエチレンテレフタレート樹脂を用いる。
押出機２の除湿機付乾燥ホツパー１にて150℃
の温度で約４時間乾燥して水分を0.02％以下とし
た固有粘度0.95〜1.15のポリエチレンテレフタレ
ート樹脂を240℃〜285℃に設定したシリンダーを
経て金型３より押出す。この押出した原材料を水
温50℃に設定した第一水槽４で冷却した後第一引
取機５に引取り原反６となす。この原反６は第一
段延伸槽７内を通過して第二引取機８に引取る。
第一延伸槽７内では原反６を熱水または蒸気で85
℃〜95℃に加熱し、延伸倍率３〜4.5とする。延
伸は第一引取機５と第二引取機８との回転速度を
調整することによりおこなう。このように延伸し
た原反６は更に第二延伸槽９を通過して第三引取
機１０に送る。この第二延伸槽９内では電気ヒー
ターまたは熱風等による乾式加熱で原反６を250
℃〜350℃の高温に加熱し、延伸倍率を1.2〜1.5
とする。尚、第一段延伸とのトータル倍率は4.6
〜６である。延伸倍率4.6以下のとき充分な強度
がえられない。また延伸倍率６以上の場合たて割
れ、延伸切断が生じる。
このように二段延伸した原反はバンド１５とな
り、ヒートセツト槽１２内を通過させて乾式ヒー
ター200℃にてヒートセツト（熱固定）し、第二
冷却槽１３にて冷却の後、第四引取機１４を経て
巻取装置１６にて巻取る。尚、第三引取機１０と
第四引取機１４との引取スピード比は同速もしく
は第四引取機１４の引取スピードを約３％ダウン
させている。なお、図中１１はエンボスロールで
あり、必要に応じて使用すればよい。
次に、上記の如く製造した本発明によつて得ら
れるポリエチレンテレフタレート樹脂製バンド
と、樹脂の固有粘度を本発明と同じくし一段延伸
したポリエチレンテレフタレート樹脂製バンド
と、固有粘度0.90以下で二段延伸したポリエチレ
ンテレフタレート樹脂製バンドと、固有粘度
0.90以下で一段延伸したポリエチレンテレフタレ
ート樹脂製バンドとを物性比較した表を示す。
尚、いずれも巾が16mm、厚みが0.6mmのバンドで
ある。
The present invention relates to a method of manufacturing a band made of polyethylene terephthalate resin. Binding straps for heavy packaged items include binding straps made of natural fibers, synthetic fibers, and steel. The former has disadvantages such as load collapse due to stress relaxation after bundling and breakage due to insufficient tension and knot strength, while the latter has problems such as corrosion and danger when unpacking. Therefore, a band made of polyethylene terephthalate resin was considered as a binding band to replace these. Conventional bands made of polyethylene terephthalate resin are mainly one-stage stretch molded, and polyethylene terephthalate resin with an intrinsic viscosity (IV value) of 0.90 or less is used as a raw material, and has the following drawbacks. (a) Insufficient strength. (b) Heat sealing strength is low and there are many variations in heat sealing. (c) The shrinkage rate at high temperatures is large and it cannot be used in high temperature locations. (d) Poor weather resistance. This is a drawback. Several proposals have been made in the past for two-step stretch molding of polyethylene terephthalate resin, but most of them were aimed at increasing the transparency of the film, and in addition to the same drawbacks as mentioned above, they also have drawbacks such as vertical cracking. be. The inventors focused on the fact that conventional polyethylene terephthalate resin bands have many of the above-mentioned drawbacks due to problems with resin viscosity and molding conditions, and came up with the invention. To provide a method for producing a band made of polyethylene terephthalate resin, which can withstand being left outdoors for a long period of time or in a high temperature place of 50°C to 80°C, and has heat sealing strength and material strength with large and uniform variations. The purpose is to The method for manufacturing the polyethylene terephthalate resin band of the present invention will be described in detail below. Polyethylene terephthalate resin with an intrinsic viscosity (IV value) of 0.95 to 1.15 is used as a raw material. 150℃ in drying hopper 1 with dehumidifier of extruder 2
A polyethylene terephthalate resin having an intrinsic viscosity of 0.95 to 1.15 and having a moisture content of 0.02% or less after being dried at a temperature of about 4 hours is extruded from a mold 3 through a cylinder set at a temperature of 240°C to 285°C. The extruded raw material is cooled in a first water tank 4 whose water temperature is set to 50°C, and then taken to a first take-up machine 5 to form a raw fabric 6. This original fabric 6 passes through a first stage drawing tank 7 and is taken up by a second take-up machine 8 .
In the first drawing tank 7, the original fabric 6 is heated to 85% by hot water or steam.
It is heated to 95°C to 95°C, and the stretching ratio is 3 to 4.5. Stretching is performed by adjusting the rotational speeds of the first drawing machine 5 and the second drawing machine 8. The raw fabric 6 thus stretched further passes through a second stretching tank 9 and is sent to a third take-up machine 10. In this second drawing tank 9, the original fabric 6 is heated to 250 mm by dry heating using an electric heater or hot air.
Heating to a high temperature of ℃~350℃ and stretching ratio 1.2~1.5
shall be. The total magnification with the first stage stretching is 4.6.
~6. Sufficient strength cannot be obtained when the stretching ratio is less than 4.6. Further, when the stretching ratio is 6 or more, vertical cracking and stretching breakage occur. The raw fabric stretched in two stages in this way becomes a band 15, which is passed through a heat-setting tank 12 and heat-set (heat-set) at 200°C by a dry heater.After being cooled in a second cooling tank 13, it is transferred to a fourth take-up machine. 14 and then wound up by a winding device 16. Incidentally, the take-up speed ratio of the third take-up machine 10 and the fourth take-up machine 14 is the same or about 3% lower than the take-up speed of the fourth take-up machine 14. In addition, numeral 11 in the figure is an embossing roll, which may be used as necessary. Next, a band made of polyethylene terephthalate resin obtained according to the present invention produced as described above, a band made of polyethylene terephthalate resin obtained by one-stage stretching with the same intrinsic viscosity as the present invention, and a second-stage stretching with an intrinsic viscosity of 0.90 or less. Polyethylene terephthalate resin band and intrinsic viscosity
A table comparing the physical properties of a band made of polyethylene terephthalate resin that has been stretched one step at 0.90 or less is shown.
Both bands are 16mm wide and 0.6mm thick.
【表】【table】
【表】
この表で示したように、本発明によつて得られ
るポリエチレンテレフタレート樹脂製バンドは引
張強度、融着強度がよく、収縮率が低く、耐候性
がよく、たて割れしない。
固有粘度（IV値）の高い（0.95〜1.15）ポリエ
チレンテレフタレート樹脂を用いて二段延伸し、
第二段目の延伸温度を第一段目の延伸温度よりも
三倍くらい高くしてある為、配向結晶化が促進さ
れ、たて割れせずに強度を向上でき、高温におけ
る収縮率が小さく耐候性がよくなつた。特にヒー
トシール性が良好で迅速、安定な接着作業ができ
る。
本発明の実施例１のバンドは重梱包用として最
適である。特に重梱包物を自動梱包機にて梱包す
る場合にその良好なヒートシール性が作業能率を
向上されており、又屋外や高温な場所への長期間
放置が可能である。
このようになる本発明は、引張強度、ヒートシ
ール強度共に高く、たて割れせず、高温における
経日変化（収縮）が小さく、耐候性の良好な樹脂
バンドを得ることができ、産業上利用価値の高い
ものである。[Table] As shown in this table, the polyethylene terephthalate resin band obtained by the present invention has good tensile strength and fusion strength, low shrinkage rate, good weather resistance, and does not crack vertically. Two-stage stretching is carried out using polyethylene terephthalate resin with high intrinsic viscosity (IV value) (0.95 to 1.15).
The second-stage stretching temperature is about three times higher than the first-stage stretching temperature, which promotes oriented crystallization, improves strength without vertical cracking, and reduces shrinkage at high temperatures. Weather resistance has improved. In particular, it has good heat sealing properties and allows for quick and stable bonding work. The band of Example 1 of the present invention is most suitable for heavy packaging. Its good heat-sealability improves work efficiency, especially when heavy items are packed using an automatic packing machine, and can be left outdoors or in high-temperature locations for long periods of time. Thus, the present invention has high tensile strength and heat-sealing strength, is free from vertical cracking, has little aging change (shrinkage) at high temperatures, and has good weather resistance, making it possible to obtain a resin band for industrial use. It is of high value.
図面は本発明方法の製造工程を示す概略図であ
る。
１……ホツパー、２……押出機、３……金型、
４……第一水槽、５……第一引取機、６……原
反、７……第一延伸槽、８……第二引取機、９…
…第二延伸槽、１０……第三引取機、１１……エ
ンボスロール、１２……ヒートセツト槽、１３…
…第二冷却槽、１４……第四引取機、１５……バ
ンド、１６……巻取装置。
The drawings are schematic diagrams showing the manufacturing process of the method of the present invention. 1...Hopper, 2...Extruder, 3...Mold,
4...First water tank, 5...First take-up machine, 6...Original fabric, 7...First drawing tank, 8...Second take-up machine, 9...
...Second stretching tank, 10...Third drawing machine, 11...Emboss roll, 12...Heat setting tank, 13...
... second cooling tank, 14 ... fourth take-up machine, 15 ... band, 16 ... winding device.
Claims (1)
固有粘度（IV値）が0.95〜1.15のポリエチレンテ
レフタレート樹脂を金型より押出し、この押出し
た原材料を第１水槽内で冷却して原反とし、この
原反を第一段延伸として85℃〜95℃の温度で延伸
倍率３〜4.5倍に延伸し、続いて第二段延伸とし
て250℃〜350℃との高温度で延伸し、全延伸倍率
を4.6〜６倍とし成型することを特徴とするポリ
エチレンテレフタレート樹脂製バンドの製造方
法。1 Extrude polyethylene terephthalate resin with an intrinsic viscosity (IV value) of 0.95 to 1.15 from a mold, dried in a drying hopper equipped with a dehumidifier of an extruder, and cool the extruded raw material in a first water tank to obtain a raw fabric. This original fabric is stretched at a temperature of 85°C to 95°C to a stretching ratio of 3 to 4.5 times as the first stage of stretching, and then stretched at a high temperature of 250°C to 350°C as a second stage of stretching to a total stretching ratio of 3 to 4.5 times. A method for producing a band made of polyethylene terephthalate resin, the method comprising molding the band by 4.6 to 6 times.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15575379A JPS5678955A (en) | 1979-11-30 | 1979-11-30 | Band made of polyethylene terephthalate resin and preparation thereof |
| EP80107275A EP0030648B1 (en) | 1979-11-30 | 1980-11-21 | Method for the production of polyethylene terephthalate packing material |
| DE8080107275T DE3066873D1 (en) | 1979-11-30 | 1980-11-21 | Method for the production of polyethylene terephthalate packing material |
| CA000365783A CA1150923A (en) | 1979-11-30 | 1980-11-28 | Polyethylene terephthalate packing material and a method for its production |
| US06/372,543 US4451422A (en) | 1979-11-30 | 1982-04-28 | Method for producing polyethylene terephthalate packing material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15575379A JPS5678955A (en) | 1979-11-30 | 1979-11-30 | Band made of polyethylene terephthalate resin and preparation thereof |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2688580A Division JPS5678942A (en) | 1979-11-30 | 1980-03-03 | Preparation of band made of polyethylene terephthalate resin |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5678955A JPS5678955A (en) | 1981-06-29 |
| JPS6138014B2 true JPS6138014B2 (en) | 1986-08-27 |
Family
ID=15612657
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15575379A Granted JPS5678955A (en) | 1979-11-30 | 1979-11-30 | Band made of polyethylene terephthalate resin and preparation thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5678955A (en) |
-
1979
- 1979-11-30 JP JP15575379A patent/JPS5678955A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5678955A (en) | 1981-06-29 |
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