Importance

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Abstract

A bottle making machine includes: a plurality of molds (2) for forming bottles; and cooling mechanisms (6) respectively provided for the molds. Each cooling mechanism (6) is used for exposing a corresponding mold (2) to a cooling wind to individually control a temperature of the mold (2) and includes a temperature sensor (3) for individually detecting the temperature of the mold (2) and a valve mechanism (8) for opening and closing a cooling wind path (7) that directs the cooling wind to the mold (2). An opening and closing operation of the valve mechanism (8) of each cooling mechanism (6) is controlled in accordance with a switching signal from a temperature control device 5. The temperature control device (5) fetches the temperature of the mold (2) detected by the temperature sensor (3) of each cooling mechanism (6) via a temperature indicator panel (4) at a constant interval and accumulates it in a memory. Moreover, the temperature control device (5) determines an operation amount of the valve mechanism (8) by PID control using accumulated temperature data and a target temperature.

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First Claim