Table 1 Properties of Shrink Films on Market Fig. 2 Comparison of Shrinkage curves of PS and PET films. Fig. 3 Schematic diagram of "Variations in bot

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1 Bowing Reduction in Biaxial Stretching Process of Styrenic Shrink Film and Its Properties YAMADA Hirofumi TAKEI Toshio and MORITA Tsuyoshi Trimming weight of PET bottle is tried from the trends of aseptic filling and the view of Package Recycling Law in pop drink bottling. Shrink film made of stretched film is widely used for decorative label by attaching on a PET bottle with heat shrinkage with steam or other thermal methods. Going on bottle trimming, the number of required performances of the shrink film is rising such as low-temperature shrinkage, good shrinkage-rate, less natural shrinkage ratio, preservation of bottle diameter under load, high rigidity etc. The authors set a goal to develop stryrenic shrink film for light-weight PET bottle and the major component of the film is made of novel special styrene-acrylic copolymer produced in continuous bulk polymerization process. Precise In-depth trials were done with biaxial stretcher installed with roll-type machine direction (MD) stretcher, tenter-type traverse direction (TD) stretcher to study most important performance requirement, thermal shrinkage. As a result, a best stretching condition to reduce bowing was found, and novel styrenic shrink film with good thermal shrinkage and good variations in bottle diameter to apply for light-weight PET bottle was developed. 1 Fig. 1 Examples of shrink labels in use cooling beverages. DIC Technical Review No.11 /

2 Table 1 Properties of Shrink Films on Market Fig. 2 Comparison of Shrinkage curves of PS and PET films. Fig. 3 Schematic diagram of "Variations in bottle diameter under load" test method DIC Technical Review No.11 / 2005

3 報 文 Fig. 4 Schematic diagram of pilot plant of biaxially stretching film. Fig. 5 Process of label shrinking. Fig. 6 Schematic diagram of structure change by heat treatment. 3 シュリンクフィルムの延伸加工 シュリンクフィルムの延伸加工は 一般的にロール の速度差で機械流れ方向(MD)に延伸し 連続してテ ンターを用いMD方向に対して直行する方向(TD)に延 伸する逐次二軸延伸装置が用いられる Fig. 4にその 装置概略図を示す ペットボトルのラベル用シュリン クフィルムはMD方向に比べTD方向に大きく延伸する ことが特徴であり 横延伸条件は熱収縮特性に多大な 影響を及ぼす 更に シュリンクフィルムは 印刷製 袋後 Fig. 5に示すようなボトル装着工程を経て収縮 ラベルとする Fig. 6に非晶性ポリマーにおける延伸 及び熱収縮に伴う構造変化を模式的に示す また DIC Technical Review No.11 / 2005 Fig. 7 The TEM photograph of the morphology of shrink film based Styrene-Butadiene-Coplymers. 49

4 3.1 Fig. 8 Relationship between shrinkage curve and stretching temperature in stretching ratio in Fig. 9 Relationship between shrinkage rate and stretching temperature in stretching ratio in Fig. 10 Relationship between shrinkage curve and stretching ratio in stretching temperature at 95. Fig. 11 Relationship between shrinkage rate and stretching ratio in stretching temperature at DIC Technical Review No.11 / 2005

5 Fig. 12 Relationship between shrinkage curve and thermosetting temperature in stretching ratio in 3.85 and temperature at 95. Fig. 13 Relationship between shrinkage rate and thermosetting temperature in stretching ratio in 3.85 and temperature at Fig. 14 Schematic diagram of bowing distortion on tenter. DIC Technical Review No.11 /

6 Table 2 Experimental Conditions Fig. 15 Schematic diagram of tenter patterns in thermo-setting zone. a :Relaxation ratio 10%. b :Relaxation ratio 0%. c :Relaxation ratio -10%(Re-stretching ratio 10%). 3.3 Fig. 16 Relationship between bowing distortion B and preheating temperature. 52 DIC Technical Review No.11 / 2005

7 3.3.1 Fig. 17 Relationship between bowing distortion B and stretching temperature Fig. 18 Relationship between bowing distortion B and thermo-setting conditions Fig. 19 Relationship between bowing distortion B and cooling temperature. DIC Technical Review No.11 /

8 Table 3 Properties of DIC's Styrenic Shrink Film Fig. 20 Comparison of shrinkage curbes of DIC's film and others DIC Technical Review No.11 / 2005

9 YAMADA Hirofumi MORITA Tsuyoshi TAKEI Toshio DIC Technical Review No.11 /

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