JPS59229317A - Preparation of low temperature heat-shrinkable film - Google Patents
Preparation of low temperature heat-shrinkable filmInfo
- Publication number
- JPS59229317A JPS59229317A JP10418683A JP10418683A JPS59229317A JP S59229317 A JPS59229317 A JP S59229317A JP 10418683 A JP10418683 A JP 10418683A JP 10418683 A JP10418683 A JP 10418683A JP S59229317 A JPS59229317 A JP S59229317A
- Authority
- JP
- Japan
- Prior art keywords
- film
- stretching
- temperature heat
- low temperature
- shrinkable film
- 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.)
- Granted
Links
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
- B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
- B29C61/003—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor characterised by the choice of material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/06—PE, i.e. polyethylene
Landscapes
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は低温で熱収縮性を有し、かつ著しく透明性がす
ぐれ、かつその強度も抜群忙すぐれた特長を有するフィ
ルムの製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a film that has heat shrinkability at low temperatures, excellent transparency, and excellent strength.
従来低温熱収縮性フィルムとしては一般に高圧法ポリエ
チレンと言われている長鎖分岐を有する低密度ポリエチ
レン樹脂、又は本樹脂にエチレン−酢酸ビニル共重合体
又はブテン系ゴム等のブレンド物によるフィルムを１．
５〜３．０倍に延伸することにより２０〜ｆｏＯｐで３
０〜５０％の低温収縮性能を出すようにしたフィルムが
使用されていた。Conventional low-temperature heat-shrinkable films include low-density polyethylene resins with long chain branches, generally referred to as high-pressure polyethylene, or films made from blends of this resin with ethylene-vinyl acetate copolymers, butene-based rubbers, etc. ．．
By stretching 5 to 3.0 times, 20 to 3.
Films designed to exhibit low-temperature shrinkage performance of 0 to 50% have been used.
しかしながらこのフィルムは延伸倍率が低倍率のため、
均一な延伸が出来ず延伸ムラが残ったり、フィルムに内
部歪みが残るため厚みムラや蛇行等が生じるという欠点
があり、生産性の上で大きな問題点があった。又、フィ
ルムの透明性に於いてもＨａｘａ （曇り度〕が５％
以上あり、充分なディスプレー効果を出すためのレベル
忙は到っていないという欠点があった。However, since the stretching ratio of this film is low,
There are disadvantages in that uniform stretching is not possible and stretching unevenness remains, and internal distortion remains in the film, resulting in uneven thickness and meandering, which poses a major problem in terms of productivity. Also, regarding the transparency of the film, Haxa (haze) is 5%.
Due to the above, there was a drawback that the level of busyness to produce sufficient display effects was not reached.
本発明者らは、上記の欠点を改良すべく種々研究の結果
、原料として密度□、９５５１ ／ｃｒｌ以下、メルト
インデックス０．５〜８１７１０ ｗｉｎの短鎖分岐を
有する直鎖状低密度ポリエチレン樹脂（以下ＬＬＤＰＩ
Ｅという）を使用したフィルムをｐ−ルの直径２００Ｘ
φ以下の２本の胃−ル間でエアーギャップ１０％以下で
延伸倍率５．０〜６．０に延伸することにより、フィル
ムの透明性が著しくすぐれかつ延坪ムラが無くて、フイ
ルム厚みが均一で、フィルム強度のすぐれた低温度収縮
性フィルムを製造し得ることを児い出して本発明の完成
忙至った。As a result of various studies to improve the above-mentioned drawbacks, the present inventors have found that a linear low-density polyethylene resin (with short chain branches) having a density of □, 9551/crl or less and a melt index of 0.5 to 81,710 win as a raw material ( Below LLDPI
A film using P-L diameter 200X
By stretching the film at a stretching ratio of 5.0 to 6.0 with an air gap of 10% or less between two stomachs of diameter less than φ, the transparency of the film is excellent, there is no unevenness in the drawing area, and the film thickness is uniform. Therefore, they discovered that it was possible to produce a low-temperature shrinkable film with excellent film strength, and were busy completing the present invention.
すなわち本発明は低温熱収縮性フィルムの製造方法に於
いて、原料として使用する低密度ポリエチレン樹脂を０
．９３５１１／−以下の短鎖分岐を有するＬＬＤＰＩＣ
を使用することにより、フィルムの延伸倍率を３．０〜
６．０と高倍率にすることが可能となり、均一な延伸に
よりフィルムの厚みムラのない均一なフィルムが得られ
ると同時に％に延伸倍率が５倍を越えると本樹脂による
フィルムは急激に透明性が著しく向上して。That is, the present invention provides a method for producing a low-temperature heat-shrinkable film in which the low-density polyethylene resin used as a raw material is reduced to zero.
．． LLDPIC with short chain branching less than or equal to 93511/-
By using , the stretching ratio of the film can be increased from 3.0 to
It is possible to achieve a high stretching ratio of 6.0, and a uniform film with an even thickness can be obtained by uniform stretching.At the same time, when the stretching ratio exceeds 5 times, the film made of this resin suddenly becomes transparent. has improved significantly.
ビニロンフィルムのような高透明性（Ｈａ２６ｍ ３％
以下ンのものが得られることが判明した。High transparency like vinylon film (Ha26m 3%
It has been found that the following can be obtained.
本発明忙ついて以下に更忙詳しく説明する。The present invention will be explained in more detail below.
本発明に使用する樹脂は密度０．９３５．８Ｉ ／ｃｒ
ｌ以下、メルトインデックス０．５〜８１７１０ ｍｉ
ｎ。The resin used in the present invention has a density of 0.935.8I/cr
l or less, melt index 0.5 to 81710 mi
n.
好ましくは０．５〜５７１７１０ ｗｉｎの短鎖分岐を
有する直鎖状ポリエチレンであり、密度０．９５５ｇ／
ｃｔｌを超えると充分な低温熱収縮性が得られず好まし
くない。又メルトインデックス０．３，９７１０ｍ１ｎ
未満ではメルト７ラクテヤー等により良質なフィルムが
得られず、又、メルトインデックスが８１／ １０ ｗ
ｉｎを超えると得られたフィルムの強度が低下して本目
的に好ましくない。又、得られたフィルムの品質、特に
透明性をすぐれさせるため釦本樹脂の分子量分布も狭い
ものが良好で、分子量分布の目安であるＭｗ／Ｍｎ （
但し、Ｍｗ ： ＧＰＣ測定での重量平均分子量、Ｍｎ
： ＧＰＯ測定での数平均分子量）の値が３．０〜５．
０のものが好ましい。Preferably it is linear polyethylene having short chain branches of 0.5 to 571,710 win, and has a density of 0.955 g/
If it exceeds ctl, sufficient low-temperature heat shrinkability cannot be obtained, which is not preferable. Also, melt index 0.3,9710m1n
If the melt index is less than 81/10 w, it will not be possible to obtain a good quality film due to melt 7 lactyers, etc.
If it exceeds in, the strength of the obtained film decreases, which is not preferable for this purpose. In addition, in order to improve the quality of the obtained film, especially the transparency, it is preferable that the molecular weight distribution of the Kashimoto resin is narrow, and Mw/Mn (
However, Mw: weight average molecular weight in GPC measurement, Mn
: Number average molecular weight measured by GPO measurement) is 3.0 to 5.
0 is preferred.
又、本フィルム用の樹脂として、今述べて米た直鎖状ポ
リエチレンに４０ ｗｔ％以下でエチレン−酢酸ビニル
共重合体、ブテン系ゴムや長鎖分岐を有する高圧法低密
度ポリエチレン等とのブレンド物等を使用することも出
来る。In addition, as a resin for this film, a blend of 40 wt% or less of the aforementioned linear polyethylene with ethylene-vinyl acetate copolymer, butene-based rubber, high-pressure low-density polyethylene having long chain branches, etc. You can also use things.
又本樹脂フィルムに於いてはネッキングが太き（なる特
性な有するため、均一な厚みのフィルムを得るため、延
伸に使用する２本のロールに於いて、ロールの直径２０
０−φ以下であり、エアーギャップは１０〜以下、好ま
しくは３〜５ｖＸ、が好ましく延伸倍率は３．０〜６．
０が必要である。ここでいうエアーギャップとは延ｆ甲
するための２本の低速ロールと高速ロールの間で先ずフ
ィルムが低速ロールを通過してロールから外れる接点よ
り次にフィルムが高速ロールに接する点までの区間をい
う。In addition, this resin film has a characteristic of thick necking, so in order to obtain a film with a uniform thickness, the diameter of the two rolls used for stretching is 20 mm.
0-φ or less, and the air gap is 10 to 10 or less, preferably 3 to 5 vX, and the stretching ratio is 3.0 to 6.
0 is required. The air gap here is the area between the two low-speed rolls and high-speed rolls used for spreading, from the contact point where the film first passes through the low-speed roll and comes off the rolls, to the point where the film then contacts the high-speed roll. means.
延伸ロールの直径が２００ｔφを越えるとフィルムのネ
ッキングが大きくなって好ましくな（、かつ２本の延伸
ロールのエアーギャップが１０九を越えると、フィルム
のネッキングが大きくなって好ましくない。If the diameter of the stretching roll exceeds 200 tφ, the necking of the film will increase, which is undesirable (and if the air gap between the two stretching rolls exceeds 109, the necking of the film will increase, which is undesirable).
又、延伸倍率に於いても３．０未満では延伸ムラが大き
く厚みムラ等で問題となり、又透明性も不良であ・る。Also, if the stretching ratio is less than 3.0, the stretching will be uneven, resulting in problems such as uneven thickness, and the transparency will also be poor.
一方延伸倍率が６．０を越えると延伸切れふｔ生じ易く
安定生産が困難となる。又、本発明低温熱収縮フィルム
を製造する上での延伸温度は特に限定されないが本発明
の目的な達・成する上からは７０〜１１０Ｃが好ましく
、特に好ましくは８０〜１００Ｃがすぐれた低温熱収縮
特性を発揮する。On the other hand, if the stretching ratio exceeds 6.0, stretching breaks tend to occur, making stable production difficult. Further, the stretching temperature for producing the low temperature heat shrinkable film of the present invention is not particularly limited, but from the standpoint of achieving the object of the present invention, it is preferably 70 to 110C, and particularly preferably 80 to 100C, which is an excellent low temperature heat. Exhibits shrinkage properties.
以下に本発明の作用効果を実施例及び比較例を以って説
明する。尚以下の例中で用いたフィルム物性の測定方法
は次の通りである。The effects of the present invention will be explained below using Examples and Comparative Examples. The method for measuring film physical properties used in the following examples is as follows.
※１） Ｈａｚｅ（％） ； ＡＳ’ｒＭ Ｄ
−１００５※２）＠撃強度（ｋｇ ｃｍ ／■〕；
、振子式 衝撃子＝１インチ半球
※３）熱収縮率（％） ； ＪＩ１３Ｚ １７０９ （
９０Ｕ）タテ方向
秦４）厚みムラ；フィルムの両側（端）を２０〜づつス
リットした残りのフィルムの横方向、、に対してフィル
ム厚さを測定し、平均厚さに対するＲ（最大厚さ一最小
の厚さ）の％を求め□た。*1) Haze (%); AS'rMD
-1005*2) @Impact strength (kg cm/■);
, Pendulum type impactor = 1 inch hemisphere *3) Heat shrinkage rate (%); JI13Z 1709 (
90U) Vertical direction 4) Thickness unevenness: Measure the film thickness in the horizontal direction of the remaining film after slitting each side (end) of the film by 20~, and calculate the R (maximum thickness % of the minimum thickness) was calculated.
実施例１
密度０．９１ ｙ ｔｚ ／ｃｒ１．メルトインデック
ス０．５１／ ／ １０ ｗｉｎの短鎖分岐を有する直
鎖状低密度ポリエチレン樹脂フィルムを延伸ロール直径
８０鬼の２本のロール間でエアーギャップ３％で延伸倍
率３．５に延伸温度ａＯＣで延伸し、得られたフィルム
（厚み４０μ〕の物性を測定した。結果を第１表に示す
。Example 1 Density 0.91 y tz /cr1. A linear low-density polyethylene resin film with short chain branches with a melt index of 0.51//10 win was stretched between two rolls with a diameter of 80 mm at an air gap of 3% and a stretching ratio of 3.5 at a temperature of aOC. The physical properties of the obtained film (thickness: 40 μm) were measured. The results are shown in Table 1.
実施例２〜５
第１表に示す樹脂を使用し、又同表に示す条件下で行っ
た他は実施例１と同様にして延伸フィルムを得た。結果
を第１表に示す。Examples 2 to 5 Stretched films were obtained in the same manner as in Example 1, except that the resins shown in Table 1 were used and the conditions shown in Table 1 were used. The results are shown in Table 1.
比較例１
密度０．９２８ ｙ ／ｃｔｙ？、メルトインデックス
１．０１７１０ ｗｉｎの短鎖分岐を有する直鎖状低密
度ポリエチレン樹脂フィルムを延伸ロール直径２５０％
の２本のロール間でエアーギャップ５ｔで延伸倍率４．
５に延伸温度１００Ｃで延伸した。得られたフィルム（
厚み４０μ）の物性の測定結果を第２表に示す。Comparative Example 1 Density 0.928 y/cty? , a linear low-density polyethylene resin film with short chain branches with a melt index of 1.01710 win was stretched with a roll diameter of 250%.
Stretching ratio is 4.0 with an air gap of 5t between two rolls.
5, the film was stretched at a stretching temperature of 100C. The resulting film (
Table 2 shows the measurement results of the physical properties of the sample having a thickness of 40 μm.
比較例２〜７
第２表に示す樹脂を使用し、又同表に示す条件下で行っ
た他は比較例１と同様にして延伸フィルムを得た。結果
を第２表に示す。Comparative Examples 2 to 7 Stretched films were obtained in the same manner as in Comparative Example 1, except that the resins shown in Table 2 were used and the conditions shown in Table 2 were used. The results are shown in Table 2.
Claims (1)
ス０．６〜８１７１０ ｗｉｎの短鎖分岐を有する直鎖
状低密度ポリエチレン樹脂フィルムをロールの直径２０
０鬼φ以下の２本の四−ル間でエアーギャップ１０鬼以
下で延伸倍率３．０〜６．０に延伸することを４！徴と
する低温熱収縮性フィルムの製造方法。Density 0.935! ! /Cn? Hereinafter, a linear low-density polyethylene resin film having short chain branches with a melt index of 0.6 to 81,710 win was rolled with a roll diameter of 20 mm.
4! Stretch to a stretching ratio of 3.0 to 6.0 with an air gap of 10 or less between two four-rules with a diameter of 0 or less φ! A method for producing a low-temperature heat-shrinkable film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10418683A JPS59229317A (en) | 1983-06-13 | 1983-06-13 | Preparation of low temperature heat-shrinkable film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10418683A JPS59229317A (en) | 1983-06-13 | 1983-06-13 | Preparation of low temperature heat-shrinkable film |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59229317A true JPS59229317A (en) | 1984-12-22 |
| JPH0365249B2 JPH0365249B2 (en) | 1991-10-11 |
Family
ID=14373958
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10418683A Granted JPS59229317A (en) | 1983-06-13 | 1983-06-13 | Preparation of low temperature heat-shrinkable film |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59229317A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61113255U (en) * | 1984-12-27 | 1986-07-17 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56126A (en) * | 1979-06-08 | 1981-01-06 | Mobil Oil | Thermoplastic uniaxial drawn film |
| JPS57181828A (en) * | 1981-04-23 | 1982-11-09 | Du Pont | Shrinkable film of ethylene/alpha- olefin copolymer |
| JPS58119827A (en) * | 1982-01-12 | 1983-07-16 | Gunze Ltd | Manufacture of film heat-shrinkable longitudinally |
-
1983
- 1983-06-13 JP JP10418683A patent/JPS59229317A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56126A (en) * | 1979-06-08 | 1981-01-06 | Mobil Oil | Thermoplastic uniaxial drawn film |
| JPS57181828A (en) * | 1981-04-23 | 1982-11-09 | Du Pont | Shrinkable film of ethylene/alpha- olefin copolymer |
| JPS58119827A (en) * | 1982-01-12 | 1983-07-16 | Gunze Ltd | Manufacture of film heat-shrinkable longitudinally |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61113255U (en) * | 1984-12-27 | 1986-07-17 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0365249B2 (en) | 1991-10-11 |
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