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A method for producing bottle-type containers made of a synthetic resin, e.g., polyethylene-terephthalate resin, includes a heat treatment step for heating and crystallizing a neck portion of a perform corresponding to a neck portion of a container. In a first stage of the heat treatment step, the n

A method for producing bottle-type containers made of a synthetic resin, e.g., polyethylene-terephthalate resin, includes a heat treatment step for heating and crystallizing a neck portion of a perform corresponding to a neck portion of a container. In a first stage of the heat treatment step, the neck portion of the perform is temporarily heated to a temperature below a melting point of the synthetic resin, e.g., approximately 200° C. to 230° C. in the case of polyethylene terephthalate resin. In a subsequent second stage, the neck portion is maintained at a temperature within a range in which crystallization of the synthetic resin is promoted, e.g. approximately 170° C. to 195° C. in the case of polyethylene terephthalate resin.

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What is claimed is: 1. An apparatus for producing bottle-type synthetic resin containers, comprising a heat treatment means for heating and crystallizing a neck portion of a preform corresponding to a neck portion of a container, wherein said heat treatment means is operated in a first stage so tha

What is claimed is: 1. An apparatus for producing bottle-type synthetic resin containers, comprising a heat treatment means for heating and crystallizing a neck portion of a preform corresponding to a neck portion of a container, wherein said heat treatment means is operated in a first stage so that said neck portion of the preform is temporarily heated thereby causing a temperature in said neck portion to elevate above a range in which crystallization of the synthetic resin is promoted and below a melting point of the synthetic resin, and in a second stage so that the neck portion is subsequently maintained at a temperature within the range in which crystallization of the synthetic resin is promoted. 2. The apparatus according to claim 1, wherein said heat treatment means comprises a heater and a control means for controlling a heating output of the heater so that the heating output is controlled to a relatively high level in the first stage of the heat treatment, and to a relatively low level in the second stage. 3. The apparatus according to claim 1, further comprising an air nozzle for applying an air shower to an outer surface at the neck portion of the preform, in the second stage of the heat treatment. 4. The apparatus according to claim 3, further comprising a shield for covering an opening of the neck portion, upon application of the air shower. 5. An apparatus for producing bottle-type polyethylene terephthalate resin containers, comprising a heat treatment means for heating and crystallizing a neck portion of a preform corresponding to a neck portion of a container, wherein said heat treatment means is operated in a first stage so that said neck portion of the preform is temporarily heated thereby causing a temperature in said neck portion to elevate to approximately 200° C. to 230° C., and in a second stage so that said neck portion is subsequently maintained at a temperature of approximately 170° C. to 195° C. 6. The apparatus according to claim 5, wherein said heat treatment means comprises a heater and a control means for controlling a heating output of the heater so that the heating output is controlled to a relatively high level in the first stage of the heat treatment, and to a relatively low level in the second stage. 7. The apparatus according to claim 5, further comprising an air nozzle for applying an air shower to an outer surface at the neck portion of the preform, in the second stage of the heat treatment. 8. The apparatus according to claim 7, further comprising a shield for covering an opening of the neck portion, upon application of the air shower. 9. The apparatus according to claim 1, wherein, prior to the operation of the heat treatment means, the neck portion is at a temperature that is below the range in which crystallization of the synthetic resin is promoted. 10. The apparatus according to claim 5, wherein, prior to the operation of the heat treatment means, the neck portion is at a temperature that is below the range in which crystallization of the synthetic resin is promoted.