Blow molding apparatus and blow molding method
First Claim
1. A blow molding method of supplying a pressurized liquid into a bottomed tubular preform fitted to a mold used for blow molding and molding the preform into a shape conforming to a cavity of the mold, the blow molding method comprising:
- a liquid supply step of supplying a pressurized liquid into the preform through a blow nozzle fitted to a mouth tubular portion of the preform by using a plunger pump; and
a peak pressure control step of changing an actuation rate and an actuation force of the plunger pump during the supply of the pressurized liquid into the preform to regulate a peak pressure of the liquid supplied into the preform to be from 3.5 MPa to 5.0 MPa,wherein, in the peak pressure control step, upon an elapse of a predetermined time period from a start of the supply of the pressurized liquid into the preform, the actuation rate and the actuation force of the plunger pump are changed to values that are lower than those before the elapse of the predetermined time period so as to lower a pressure of the pressurized liquid supplied into the preform,and wherein the predetermined time period from a start of a supply of a pressurized liquid into the preform to when the actuation rate and the actuation force of the plunger pump are changed is between 0.228 seconds and 0.5 seconds.
2 Assignments
0 Petitions
Accused Products
Abstract
A blow molding apparatus that supplies a pressurized liquid into a bottomed tubular preform fitted to a mold used for blow molding and molds the preform into a shape conforming to a cavity of the mold, the blow molding apparatus including: a blow nozzle fitted to a mouth tubular portion of the preform; a plunger pump configured to supply the pressurized liquid into the preform through the blow nozzle; and a control device configured to change an actuation rate and an actuation force of the plunger pump during the supply of the pressurized liquid into the preform to regulate a peak pressure of the liquid supplied into the preform to be from 3.5 MPa to 5.0 MPa.
2 Citations
8 Claims
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1. A blow molding method of supplying a pressurized liquid into a bottomed tubular preform fitted to a mold used for blow molding and molding the preform into a shape conforming to a cavity of the mold, the blow molding method comprising:
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a liquid supply step of supplying a pressurized liquid into the preform through a blow nozzle fitted to a mouth tubular portion of the preform by using a plunger pump; and a peak pressure control step of changing an actuation rate and an actuation force of the plunger pump during the supply of the pressurized liquid into the preform to regulate a peak pressure of the liquid supplied into the preform to be from 3.5 MPa to 5.0 MPa, wherein, in the peak pressure control step, upon an elapse of a predetermined time period from a start of the supply of the pressurized liquid into the preform, the actuation rate and the actuation force of the plunger pump are changed to values that are lower than those before the elapse of the predetermined time period so as to lower a pressure of the pressurized liquid supplied into the preform, and wherein the predetermined time period from a start of a supply of a pressurized liquid into the preform to when the actuation rate and the actuation force of the plunger pump are changed is between 0.228 seconds and 0.5 seconds. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification