JPH0216031A - Heat-shrinkable polyurethane film - Google Patents
Heat-shrinkable polyurethane filmInfo
- Publication number
- JPH0216031A JPH0216031A JP16411988A JP16411988A JPH0216031A JP H0216031 A JPH0216031 A JP H0216031A JP 16411988 A JP16411988 A JP 16411988A JP 16411988 A JP16411988 A JP 16411988A JP H0216031 A JPH0216031 A JP H0216031A
- Authority
- JP
- Japan
- Prior art keywords
- heat
- film
- shrinkable
- thermoplastic polyurethane
- shrinkage rate
- 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
- 229920006264 polyurethane film Polymers 0.000 title claims abstract description 21
- 229920002803 thermoplastic polyurethane Polymers 0.000 claims abstract description 16
- 239000013078 crystal Substances 0.000 claims abstract description 13
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims abstract description 12
- 230000004927 fusion Effects 0.000 claims abstract description 12
- 235000011187 glycerol Nutrition 0.000 claims abstract description 6
- 239000004721 Polyphenylene oxide Substances 0.000 abstract description 2
- 239000004417 polycarbonate Substances 0.000 abstract description 2
- 229920000515 polycarbonate Polymers 0.000 abstract description 2
- 229920000570 polyether Polymers 0.000 abstract description 2
- 230000035939 shock Effects 0.000 abstract description 2
- 125000004185 ester group Chemical group 0.000 abstract 1
- 229920006257 Heat-shrinkable film Polymers 0.000 description 8
- -1 polypropylene Polymers 0.000 description 7
- 238000004806 packaging method and process Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 229920000915 polyvinyl chloride Polymers 0.000 description 5
- 239000004800 polyvinyl chloride Substances 0.000 description 5
- 239000004743 Polypropylene Substances 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920005862 polyol Polymers 0.000 description 2
- 150000003077 polyols Chemical class 0.000 description 2
- 229920005749 polyurethane resin Polymers 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 1
- 206010028347 Muscle twitching Diseases 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004433 Thermoplastic polyurethane Substances 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000001588 bifunctional effect Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 125000005442 diisocyanate group Chemical group 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 150000002334 glycols Chemical class 0.000 description 1
- 238000009863 impact test Methods 0.000 description 1
- 239000012770 industrial material Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- JOYRKODLDBILNP-UHFFFAOYSA-N urethane group Chemical group NC(=O)OCC JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
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】
［産業上の利用分野］
本発明は、各種物品の収縮用包材として極めて好適な、
空刺、衝撃等の機械的強度に優れた熱収縮性ポリウレタ
ンフィルムに関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention provides a shrink wrapping material which is extremely suitable as a shrink wrapping material for various articles.
This invention relates to a heat-shrinkable polyurethane film that has excellent mechanical strength against punctures, impacts, etc.
［従来の技術］
従来より、収縮包装用フィルムとしては、ポリ塩化ビニ
ル系、ポリプロピレン系、ポリエチレン系などの熱収縮
性フィルムが知られ、それぞれの特徴を活した分野で広
く利用されている。[Prior Art] Conventionally, heat shrinkable films such as polyvinyl chloride, polypropylene, and polyethylene are known as shrink wrapping films, and are widely used in fields that take advantage of their respective characteristics.
しかしながら、これらのうちポリ塩化ビニル系熱収縮フ
ィルムは、低温収縮性に優れるが、反面熱シールの際に
塩素ガスが発生したり、あるいは可塑剤等の移行による
衛生上の問題に加えて、引張、引裂、空刺、′ａｇ１等
の機械的強度に乏しいといった数多くの欠点を有してい
る。また一方、ポリプロピレン系及びポリエチレン系熱
収縮フィルムはコストが安く汎用されているが、収縮温
度が比較的高い上にこの場合も空刺、衝撃等の強度が弱
く裂けやすいという問題を有するなど、これら既存の収
縮包装用フィルムは、そのいずれをとってみても空刺、
衝撃等に対する抵抗性の点でユーザーの要望に応えられ
るものが見当たらないのが現状である。However, among these, polyvinyl chloride-based heat-shrinkable films have excellent low-temperature shrinkability, but on the other hand, they generate chlorine gas during heat-sealing, and in addition to hygienic problems due to migration of plasticizers, etc. It has many drawbacks such as poor mechanical strength such as tearing, puncturing, and 'ag1. On the other hand, heat-shrinkable polypropylene and polyethylene films are inexpensive and widely used, but they have problems such as relatively high shrinkage temperatures and weak strength against punches and impacts, making them easy to tear. Existing shrink wrapping films all have hollow pricks,
At present, there is no product that can meet the needs of users in terms of resistance to shock and the like.
［発明が解決しようとする課題］
本発明は、かかる事情に鑑みなされたものであり、その
目的とするところは、柔軟で、引張、引裂等の強度が強
く、しかも空刺、衝撃等の外力に対してとりわけ優れた
抵抗性を有する熱収縮性ポリウレタンフィルムを提供す
る点にある。[Problems to be Solved by the Invention] The present invention has been made in view of the above circumstances, and aims to be flexible, have high strength against tensile and tearing, and be resistant to external forces such as dry puncture and impact. It is an object of the present invention to provide a heat-shrinkable polyurethane film having particularly excellent resistance to.
［課題を解決するための手段］
本発明者等は、前記目的を達成するために、機械的強度
か強く、しかも柔軟性と弾力性に関してず量れた性質を
有する熱可塑性ポリウレタン樹脂に着目し、該ポリウレ
タン樹脂ベースの熱収縮性フィルムについて鋭意検討し
た結果、特定の結晶性と熱収縮性並びに永久伸びを有す
るポリウレタンフィルムであれは、これまでのポリ塩化
ビニル系樹脂等の熱収縮フィルムには見られなかった優
れた空刺、街７等の機械的強度を有する、収縮用包材と
して好適なフィルムが得られることを見い出し、本発明
を完成させた。[Means for Solving the Problems] In order to achieve the above object, the present inventors focused on a thermoplastic polyurethane resin that has high mechanical strength and has a wide range of flexibility and elasticity. As a result of intensive studies on heat-shrinkable films based on polyurethane resins, we found that polyurethane films with specific crystallinity, heat-shrinkability, and permanent elongation are not compatible with conventional heat-shrinkable films such as polyvinyl chloride resins. It was discovered that a film suitable as a shrink wrapping material can be obtained, which has excellent mechanical strength such as dry pricking and Gai 7, which has never been seen before, and has completed the present invention.
即ち、本発明は結晶融解熱０．１乃至３．０ｃａＪ２／
ｇの熱可塑性ポリウレタン樹脂よりなるフィルムであっ
て、該フィルムの １２０℃グリセリン浴中での熱ｌｌ
！２縮率が長さ及び幅方向の少くともいずれか一方に２
０％以上であり、且つ永久伸びが３０％以下であること
を特徴とする熱収縮性ポリウレタンフィルムに係るもの
である。That is, the present invention has a crystal heat of fusion of 0.1 to 3.0 caJ2/
A film made of a thermoplastic polyurethane resin of
! 2 The shrinkage ratio is 2 in at least one of the length and width directions.
0% or more and a permanent elongation of 30% or less.
以下、本発明の熱収縮性ポリウレタンフィルムについて
詳しく説明する。Hereinafter, the heat-shrinkable polyurethane film of the present invention will be explained in detail.
本発明において熱可塑性ポリウレタン樹脂とは、二官能
性ポリオールとジイソシアネート及びグリコールを主原
料としてなる分子構造中にウレタン基を含有するゴム状
弾性高分子のうち、熱可塑性を有するものを総称し、具
体的には使用される前記ポリオール等の原料の種類によ
って区別されるところのアジペートエステル系、ポリエ
ーテル系、カプロラクトンエステル系、ポリ炭酸エステ
ル系等の熱可塑性ポリウレタン樹脂の一種又は二種以上
−からなるものであって、且つその結晶融解熱が ０．
１乃至３．０ｃａｌ／ｇ、好ましくは ０．５乃至２、
ｏｃａＵ／ｇのものである。In the present invention, thermoplastic polyurethane resin is a general term for thermoplastic rubber-like elastic polymers containing urethane groups in the molecular structure made from bifunctional polyols, diisocyanates, and glycols as main raw materials. Consisting of one or more thermoplastic polyurethane resins such as adipate ester, polyether, caprolactone ester, and polycarbonate ester, which are distinguished depending on the type of raw material such as the polyol used. and whose heat of crystal fusion is 0.
1 to 3.0 cal/g, preferably 0.5 to 2,
ocaU/g.
ここで、熱可塑性ポリウレタン樹脂の結晶融解熱がｏ、
ｔｃａＵ／ｇ未満の場合は、粘着性が強く、内包する物
品とフィルムとが密着しやすいために、密着した部分が
収縮不足となったり、あるいはひきつり現象を生じて外
観不良を呈するなど、収縮用包材として致命的な問題が
発生するのに対し、結晶融解熱が３．０ｃａｌ／ｇより
大きくなると、柔軟性、弾力性、更には熱収縮性等が低
下して、本発明の目的とするような熱収縮性フィルムが
得られない。Here, the heat of crystal fusion of the thermoplastic polyurethane resin is o,
If it is less than tcaU/g, the adhesiveness is strong and the film tends to come into close contact with the packaged product, resulting in insufficient shrinkage of the parts that are in close contact with each other, or a twitching phenomenon that causes poor appearance. A fatal problem occurs as a packaging material, whereas when the heat of crystal fusion is greater than 3.0 cal/g, flexibility, elasticity, and even heat shrinkability decrease, which is the object of the present invention. A heat-shrinkable film like this cannot be obtained.
尚、本発明で使用する熱可塑性ポリウレタン樹脂は、結
晶融解熱が前記条件を満足するものであれば、結晶性を
有する熱可塑性ポリウレタン樹脂と結晶性を持たない通
常の熱可塑性ポリウレタン樹脂をブレンドして用いるこ
とができるほか、その性質を大きく変えない範囲内でポ
リ塩化ビニル系、ポリエステル系、ポリアミド系、アク
リル系、ポリオレフィン系等の熱可塑性樹脂をブレンド
したり、あるいは耐候性、取扱い性等を向上させる目的
で紫外線吸収剤、酸化防止剤、着色剤、滑剤等を必要に
応じて適宜添加してもさしつかえない。The thermoplastic polyurethane resin used in the present invention is a blend of a crystalline thermoplastic polyurethane resin and a non-crystalline ordinary thermoplastic polyurethane resin, as long as the heat of crystal fusion satisfies the above conditions. In addition, thermoplastic resins such as polyvinyl chloride, polyester, polyamide, acrylic, and polyolefin can be blended within the range that does not significantly change the properties, or they can be used to improve weather resistance, ease of handling, etc. For the purpose of improving the quality, ultraviolet absorbers, antioxidants, colorants, lubricants, etc. may be added as appropriate.
本発明の熱収縮性ポリウレタンフィルムはまた、該フィ
ルムの１２０℃グリセリン浴中での熱収縮率が長さ及び
幅方向の少なくともいずれか一方に２０％以上、好まし
くは３０％以上であって、且つ永久伸びが３０％以下、
好ましくは２０％以下でなければならない。The heat-shrinkable polyurethane film of the present invention also has a heat shrinkage rate of 20% or more in at least one of the length and width directions, preferably 30% or more in a 120° C. glycerin bath, and Permanent elongation is less than 30%,
It should preferably be below 20%.
なぜなら、本発明者等は、柔軟性と弾力性に特異な性質
を有する熱可塑性ポリウレタンフィルムを収縮用包材と
して用いた場合、比較的低い収縮率でも優れた緊縛性が
得られる点に着目し、該フィルムの収縮率と包装後の緊
縛性並びに空刺、衝２などに対する抵抗性について詳し
く検討した結果、フィルムの収縮率が大きくなると緊縛
性は向上するが、反面分子配向が進みずぎて永久伸びが
増大し、空刺、衝撃等の機械的強度が低下するという現
象がみられるなど、熱収縮率と永久伸びの両者が特定の
条件を満足してはじめてポリウレタンフィルムの収縮用
包材への応用が可能になるからである。This is because the present inventors focused on the fact that when a thermoplastic polyurethane film, which has unique properties of flexibility and elasticity, is used as a shrink wrapping material, excellent binding properties can be obtained even with a relatively low shrinkage rate. As a result of a detailed study of the shrinkage rate of the film, its binding properties after packaging, and its resistance to puncture, impact 2, etc., it was found that as the shrinkage rate of the film increases, the binding properties improve, but on the other hand, the molecular orientation does not progress too much. Polyurethane film can only be used as a shrink wrapping material when both heat shrinkage rate and permanent elongation meet certain conditions, such as an increase in permanent elongation and a decrease in mechanical strength against punctures and impact. This is because it becomes possible to apply
従って、本発明のポリウレタンフィルムにおいて、 １
２０℃グリセリン浴中での熱収縮率が長さ及び幅方向の
少くともいずれか一方に２０％未満の場合は、収縮不足
となって包装後の仕上り外観が悪くなる一方、フィルム
の永久伸びが３０％より大きくなると空刺、衝繁等の機
械的強度が大幅に低下して、ポリウレタンフィルムの特
性が失われるという不都合な問題が生じる。Therefore, in the polyurethane film of the present invention, 1
If the heat shrinkage rate in a 20°C glycerin bath is less than 20% in at least one of the length and width directions, the shrinkage will be insufficient and the finished appearance after packaging will deteriorate, while the permanent elongation of the film will deteriorate. If it exceeds 30%, mechanical strength such as hollow pricking and burrowing will be significantly reduced, causing an inconvenient problem that the properties of the polyurethane film will be lost.
尚、本発明において、ポリウレタンフィルムの熱収縮率
をグリセリン浴中での値として表した理由は、収縮包装
の際に通常よく用いられる熱風あるいはスチーム等の熱
媒に比べて、フィルムへの熱伝導が均一で、熱収縮率を
正しく定量評価できるためである。In addition, in the present invention, the reason why the heat shrinkage rate of polyurethane film is expressed as the value in a glycerin bath is that the heat conduction to the film is more This is because the heat shrinkage rate is uniform and the thermal shrinkage rate can be accurately and quantitatively evaluated.
また、本発明の熱収縮性ポリウレタンフィルムの厚さは
、その用途に応じて適宜選択されるもので特に限定する
必要はないが、フィルム強度、緊縛性、経済性、更には
内包される物品へのフィツト感等を考慮した場合、フィ
ルム厚さは、通常１０乃至３００μのものが好適である
。In addition, the thickness of the heat-shrinkable polyurethane film of the present invention is appropriately selected depending on its use and does not need to be particularly limited. Considering the fit and the like, the film thickness is usually preferably 10 to 300 μm.
［実施例］
以下、本発明の熱収縮性ポリウレタンフィルムについて
、実施例により更に詳しく説明する。[Example] Hereinafter, the heat-shrinkable polyurethane film of the present invention will be explained in more detail with reference to Examples.
尚、本発明において行った物性の測定法及び評価方法は
次の如くである。The physical properties were measured and evaluated in the following manner in the present invention.
（１）結晶融解熱
差動走査熱量計（ＤＳＣ）に１５ｍｇの試料を入れ、こ
れを１５℃／ｍｉｎの昇温速度で昇温し、融解時にあら
れれる発熱ピークの面積から発熱量を求め、これを試料
１ｇ当りに換算して求めた。(1) Place 15 mg of the sample in a crystal melting heat differential scanning calorimeter (DSC), raise the temperature at a rate of 15°C/min, and calculate the calorific value from the area of the exothermic peak that appears during melting. This was calculated by converting it into 1 g of sample.
（２） 熱収縮率
試料フィルムを １２０℃グリセリン浴中に１０秒間浸
漬し、その間の熱収縮率を求めた。(2) Heat shrinkage rate The sample film was immersed in a 120°C glycerin bath for 10 seconds, and the heat shrinkage rate during that time was determined.
（３）永久伸び
ダンベル１号形に打抜いた試料フィルムを、標線間の伸
びが１００％に相当する長さに引張り、１０分間保持し
たのち収縮させ、次式により永久伸びを測定した。(3) Permanent elongation A sample film punched into a No. 1 dumbbell shape was pulled to a length corresponding to 100% elongation between the marked lines, held for 10 minutes, and then shrunk, and the permanent elongation was measured using the following formula.
Ｌｌ：収縮させた後の標線間距離
（４）空刺強度
直径７５φの円筒状リングの断面に、試料フィルムを覆
せて固定した後、該円形フィルム面の中心に先端角５３
度の円錐ヘッドを２００ｍｍ／ｍｉｎの速度で突刺し、
フィルムに穴が開くまでの最大荷重（単位二ｇ）を空刺
強度とした。Ll: Distance between marked lines after shrinkage (4) Puncture strength After fixing the sample film upside down on the cross section of a cylindrical ring with a diameter of 75φ, the tip angle 53 is placed at the center of the circular film surface.
Pierce the conical head at a speed of 200 mm/min,
The maximum load (unit: 2 g) until a hole was formed in the film was defined as the punch strength.
（５）衝γ強度
撮子式衝撃試験ｍ（東洋精機製作所製フィルムインパク
トテスター）を用い、フルスケール３０ ｋｇ−ｃｍ
、衝撃ヘッド １７２インチの条件で衝撃強度（単位：
ｋｇ−ｃｍ）を測定した。(5) Impact gamma strength photographic impact test m (Film impact tester manufactured by Toyo Seiki Seisakusho), full scale 30 kg-cm
, impact strength under the condition of impact head 172 inches (unit:
kg-cm) was measured.
（６）収縮包装後の外観
トンネル内温度約１４０乃至１６０℃、通過時間約１０
秒に設定した収縮トンネル装置を用いて、試料フィルム
が二軸１１５！縮性の場合（実施例１〜７、比較例１〜
４）は三方シール包装によって、また試料フィルムが一
軸収縮性の場合（実施例８〜１０、比較例５〜６）はス
リーブシール包装によってそれぞれスプレー容器を収縮
包装した。包装後の状態を目視で評価し、緊縛性、外観
共に良好なものを（Ｏ）、緊縛性が悪いかあるいは著し
い収縮むらが認められ、たものを（×）とした。(6) Appearance after shrink wrapping Temperature inside the tunnel is approximately 140 to 160°C, transit time approximately 10
Using a shrink tunnel device set to seconds, the sample film was biaxially 115! In the case of shrinkage (Examples 1 to 7, Comparative Examples 1 to
4), the spray containers were shrink-wrapped by three-sided seal packaging, and when the sample film was uniaxially shrinkable (Examples 8 to 10, Comparative Examples 5 to 6), spray containers were shrink-wrapped by sleeve seal packaging. The condition after packaging was visually evaluated, and those with good binding properties and appearance were rated (O), and those with poor binding properties or marked uneven shrinkage were rated (x).
（７）総合評価
空刺強度、；」撃強度及び収縮包装後の外観などの結果
をもどに総合評価したもので、収縮包装用フィルムとし
て好適なものを（○）、不適当なものを（×）とした。(7) Comprehensive evaluation Blow puncture strength: A comprehensive evaluation based on the results of impact strength and appearance after shrink wrapping, with films suitable for shrink wrapping (○) and unsuitable films ( x).
実施例１〜４、比較例１〜２
０径５０ｍｍのインフレーション押出成形機を用いて、
第１表に示す如き結晶融解熱の種々異なる熱可塑、性ポ
リウレタン樹脂を １６０乃至２００℃の温度で溶融混
練し、インフレダイスから押出した後、引続きブローア
ツプ比２．８乃至３．０、引取速度ｌＯ乃至１２ｍ／ｍ
ｉｎの条件でインフレーション成形することによって、
フィルム厚さ３０μの熱収縮性ポリウレタンフィルムを
作成した。Examples 1 to 4, Comparative Examples 1 to 2 Using an inflation extrusion molding machine with a diameter of 50 mm,
Thermoplastic polyurethane resins having various heats of crystal fusion as shown in Table 1 are melt-kneaded at a temperature of 160 to 200°C, extruded from an inflation die, and then successively prepared at a blow-up ratio of 2.8 to 3.0 and a take-up speed. lO~12m/m
By performing inflation molding under the conditions of
A heat-shrinkable polyurethane film having a film thickness of 30 μm was prepared.
これらポリウレタンフィルムについて、熱収縮率、永久
伸び、空刺強度、南軍強度及び収縮包装後の外観等を評
価した結果を第１表に示した。同表より、結晶融解熱、
熱収縮率、永久伸びが共に本発明の範囲にあるものは、
空刺、衝撃等の機械的強度が強く、収縮包装後の外観も
良好であるなど、熱収縮性フィルムとして好適で、更に
これらの性質は参考例として示した市販のポリ塩化ビニ
ル製熱収縮フィルム（参考例１）、及びポリプロピレン
製熱収縮フィルム（参考例２）に比べて、はるかに優れ
たものであることが確認された。Table 1 shows the results of evaluating these polyurethane films in terms of heat shrinkage rate, permanent elongation, prick strength, confederate strength, appearance after shrink wrapping, etc. From the same table, the heat of crystal fusion,
Those whose heat shrinkage rate and permanent elongation are both within the scope of the present invention are:
This is a commercially available polyvinyl chloride heat-shrinkable film that is suitable as a heat-shrinkable film because it has strong mechanical strength against punches and impacts, and has a good appearance after shrink-wrapping.These properties are also shown as a reference example. (Reference Example 1) and polypropylene heat-shrinkable film (Reference Example 2), it was confirmed to be far superior.
実施例５〜７、比較例３〜４
結晶融解熱０．８ｃａΩ／ｇの熱可塑性ポリウレタン樹
脂を、口径４０ｍｍのインフレーション押出成形機によ
り樹脂温度１８０℃にて押出した後、ブローアツプ比１
．８乃至４．０、引取速度６乃至２０ ｍ／ｍｉｎの条
件でそれぞれインフレーション成形することによって、
長さ及び幅方向の熱収縮率が種々異なる、厚さ３０μの
ポリウレタンフィルムを作成した。Examples 5 to 7, Comparative Examples 3 to 4 After extruding a thermoplastic polyurethane resin with a heat of crystal fusion of 0.8 caΩ/g at a resin temperature of 180°C using an inflation extrusion molding machine with a diameter of 40 mm, the blow-up ratio was 1.
．． By performing inflation molding under the conditions of 8 to 4.0 m/min and a take-up speed of 6 to 20 m/min,
Polyurethane films with a thickness of 30 μm were prepared with various heat shrinkage rates in the length and width directions.
これらのポリウレタンフィルムについて、永久伸び、空
刺強度、南軍強度及び収縮包装後の外観等を評価した結
果を第２表に示したが、同表より熱収縮率と永久伸びが
共に本発明の範囲にあるものは空刺、衝撃等の機械的強
度が強く、しかも収縮包装後の外観も良好であることが
確認された。Table 2 shows the results of evaluating the permanent elongation, prick strength, confederate strength, appearance after shrink wrapping, etc. of these polyurethane films. It was confirmed that those within this range had strong mechanical strength against puncture and impact, and also had a good appearance after shrink wrapping.
実施例８〜１０、比較例５〜６
結晶融解熱１．５ｃａＵ／ｇの熱可塑性ポリウレタン樹
脂を、口径５（１＋ｍのＴダイ押出成形機を用いて、樹
脂温度１９０℃の条件で押出成形した。その際、ダイス
から押出された溶融シートを周速３乃至１２ｍ／ｆｆ１
ｉｎで回転する冷却ロールで引取ることにより、長さ方
向の熱収縮率が種々異なるポリウレタンフィルムを作成
した。Examples 8 to 10, Comparative Examples 5 to 6 A thermoplastic polyurethane resin having a heat of crystal fusion of 1.5 caU/g was extruded using a T-die extruder with a diameter of 5 (1+ m) at a resin temperature of 190°C. At that time, the molten sheet extruded from the die was heated at a circumferential speed of 3 to 12 m/ff1.
Polyurethane films having various heat shrinkage rates in the longitudinal direction were prepared by taking the film with a cooling roll rotating in the machine.
これらポリウレタンフィルムについて、永久伸び、空刺
強度、衝！強度及び収縮包装後の外観等を評価した結果
、第３表に示す如く、熱収縮率と永久伸びが本発明の範
囲にあるものは、空刺、衝撃等の強度が強く、収縮包装
後の外観も良好であることが確認された。Regarding these polyurethane films, permanent elongation, puncture strength, and impact! As a result of evaluating the strength and appearance after shrink wrapping, as shown in Table 3, those whose heat shrinkage rate and permanent elongation are within the range of the present invention have high strength against punches, impact, etc. It was confirmed that the appearance was also good.
［発明の効果］
以上の如く本発明の熱収縮ポリウレタンフィルムは、こ
れまでこの種のフィルムでは持ち合わせることができな
かった、優れた空刺、衝撃等の機械的強度を有するほか
、更にポリウレタン樹脂特有の高度な引張特性と耐摩耗
性、透湿性、柔軟性並びに熱接若性等を兼備するため、
収縮用包材への応用はもちろん、収縮テープ、精密作業
用手袋等の産業用資材にも使用できるなど、その応用範
囲は多岐にわたるものである。[Effects of the Invention] As described above, the heat-shrinkable polyurethane film of the present invention not only has excellent mechanical strength such as puncture and impact resistance that has not been possible with this type of film until now, but also has properties unique to polyurethane resins. Because it has advanced tensile properties, abrasion resistance, moisture permeability, flexibility, and thermal weldability,
Its range of applications is wide-ranging, including not only shrink packaging but also industrial materials such as shrink tape and precision work gloves.
Claims (1)
ウレタン樹脂よりなるフィルムであって、該フィルムの
１２０℃グリセリン浴中での熱収縮率が長さ及び幅方向
の少くともいずれか一方に２０％以上であり、且つ永久
伸びが３０％以下であることを特徴とする熱収縮性ポリ
ウレタンフィルム。A film made of a thermoplastic polyurethane resin having a heat of crystal fusion of 0.1 to 3.0 cal/g, the heat shrinkage rate of the film in a 120°C glycerin bath in at least one of the length and width directions. A heat-shrinkable polyurethane film having a permanent elongation of 20% or more and a permanent elongation of 30% or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16411988A JP2552337B2 (en) | 1988-07-02 | 1988-07-02 | Heat shrinkable polyurethane film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16411988A JP2552337B2 (en) | 1988-07-02 | 1988-07-02 | Heat shrinkable polyurethane film |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0216031A true JPH0216031A (en) | 1990-01-19 |
| JP2552337B2 JP2552337B2 (en) | 1996-11-13 |
Family
ID=15787111
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16411988A Expired - Lifetime JP2552337B2 (en) | 1988-07-02 | 1988-07-02 | Heat shrinkable polyurethane film |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2552337B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6946172B2 (en) | 1996-11-18 | 2005-09-20 | Charles S. Munn | Rubbery products that shrink due to the application of energy and hypo-allergic rubbery products |
| US8586938B2 (en) | 2010-03-15 | 2013-11-19 | Seiko Instruments Inc. | Ultraviolet ray measuring apparatus and electronic wristwatch equipped with ultraviolet ray measuring function |
| CN109239125A (en) * | 2018-08-07 | 2019-01-18 | 东旭集团有限公司 | Percent thermal shrinkage measuring device and its base station, glass plate and percent thermal shrinkage measurement method |
-
1988
- 1988-07-02 JP JP16411988A patent/JP2552337B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6946172B2 (en) | 1996-11-18 | 2005-09-20 | Charles S. Munn | Rubbery products that shrink due to the application of energy and hypo-allergic rubbery products |
| US8586938B2 (en) | 2010-03-15 | 2013-11-19 | Seiko Instruments Inc. | Ultraviolet ray measuring apparatus and electronic wristwatch equipped with ultraviolet ray measuring function |
| CN109239125A (en) * | 2018-08-07 | 2019-01-18 | 东旭集团有限公司 | Percent thermal shrinkage measuring device and its base station, glass plate and percent thermal shrinkage measurement method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2552337B2 (en) | 1996-11-13 |
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