| 摘要 |
<p>A container (20), especially a bottle, is made from a blank or preform (10) of polyethylene terephthalate (PET), where the blank (10) has a mouth portion (11), a substantially conical upper portion (12) extending from the mouth portion (11), and a cylindrical portion (13) extending from the conical portion (12) towards the bottom of the blank and having a substantially uniform wall thickness. When reshaping the blank (10), the shoulder (22) of the container (20) is formed substantially only of material which in the blank (10) is located in the conical upper portion (12) of the blank, while the cylindrical portion (23) of the container (20) is formed substantially only of material which in the blank (10) is located in the cylindrical portion (13) of the blank. The expansion of the material in the conical portion (12) of the blank (10) and of the material in the cylindrical portion (13) of the blank (10) is selectively controlled in such a manner that the material in the respective portion undergoes stretching in the axial direction of the blank (10), defined by the quotient of the axial length of the conical portion (12) of the blank (10) and the axial length of the cylindrical portion (13) of the blank (10) having values in the range 0.25-0.35, and by the quotient of the axial length of the shoulder (22) and the axial length of the cylindrical portion (23) of the container (20) having values in the range 0.60-0.80. <IMAGE></p> |
