| 摘要 |
<p>PURPOSE:To mold a bottle by biaxially oriented blow molding, of high transparency and high heat resistance against heat contraction by specifying the value of density of bottle wall except the edge area of bottom wall and also the coefficient of contraction decreasing of the inner volume within the range of atmospheric temperature. CONSTITUTION:The bottle 1 molded by biaxially oriented blow molding is made of polyethylene terephthalate resin (PET), the main body 3 of which, consisting of the bottom wall 4 and the side wall 3 and excepting the mouth 2, is transparent, while the bottom wall 4 is almost transparent, shaped bent up and collasped. The density except the edge area of bottom wall 4 is approximately 1.360 (g/cm<2>), and the coefficient of contraction decreasing of the inner volume within the range of atmospheric temperature up to approximately 120 deg.C is maximum under 1.0%. The density of main body except the edge area of bottom wall 4 is sufficiently of high value, and the tenacity, mechanical intensity and intensity of pressure decreasing are very high. That the coefficient of contraction decreasing of inner volume under the atmospheric temperature 120 deg.C is within 1.0% means the bottle is sufficiently fit for the container of retorted food.</p> |
