| 摘要 |
<p>A PET hot fill bottle (2) has a neck (3) and a body (4). It is stretched and blown into a cavity (14), with internal pressure holding the body against the cavity. During a first period, the cavity is heated to 100° to 160°C for between 3 to 7 seconds to relax stresses in the body. During a second period the cavity is cooled to 60° to 120°C for 4 to 8 seconds. This solidifies it - without introducing stresses - so that it can be removed from the mould. The resulting bottle is heat stable when filled with water close to its boiling point, namely at 92°C to 98°C. For the rapid heating and cooling of the mould cavity, it is provided with two series of passages (16, 17). The former house ohmic heaters (18); whilst the latter are connected to water and air supply lines (19, 20).</p> |
