PARISON AND CONTAINER BLOW MOLDING METHOD USING SAME
First Claim
1. A blow molding parison for a container comprising:
- a neck forming portion, a shoulder forming portion, a body forming portion and a bottom forming portion,wherein the bottom forming portion has a sidewall and a bottom wall and wall thicknesses of both of the sidewall and bottom wall are greater than a wall thickness of a body section of the container to be molded, andwherein an external shape of the bottom forming portion of the parison is same as an external shape of a bottom section of the container to be molded.
1 Assignment
0 Petitions
Accused Products
Abstract
[Object]
To provide a parison for forming a container that includes a bottom of a thickness greater than that of a storage portion which has a squeezable property and to provide a blow-molding method using the parison.
[Solution]
A parison 50 is provided by injection molding in which external shapes of a neck forming portion 51 and a bottom forming portion 52 have the same external shapes as a neck section 20 and a bottom section 15 of a container 1 to be blow molded, respectively, and a body forming portion between the both forming portions has a thickness smaller than that of the bottom forming portion.
A blow-molding method is provided which includes steps of supplying compressed air under pressure into the parison, thereby extending the body forming portion of the parison in an axial direction and moving the bottom forming portion of the parison toward the bottom inner surface of the mold, causing the outer bottom surface of the bottom forming portion to abut on the inner bottom surface of the molds and causing an outer periphery of the bottom forming portion to abut on the bottom inner periphery of the molds, and restricting the movement of the bottom portion by such abutments, and thereafter, stretching the body forming portion in a lateral direction, and bringing the shoulder forming portion and the body forming portion into contact with inner surfaces of the molds.
-
Citations
18 Claims
-
1. A blow molding parison for a container comprising:
-
a neck forming portion, a shoulder forming portion, a body forming portion and a bottom forming portion, wherein the bottom forming portion has a sidewall and a bottom wall and wall thicknesses of both of the sidewall and bottom wall are greater than a wall thickness of a body section of the container to be molded, and wherein an external shape of the bottom forming portion of the parison is same as an external shape of a bottom section of the container to be molded. - View Dependent Claims (2, 3, 9)
-
-
4. A method for blow molding a container comprising the steps of:
-
forming a parison comprising a neck forming portion, a shoulder forming portion, a body forming portion and a bottom forming portion, wherein the bottom forming portion has a sidewall and a bottom wall and wall thicknesses of both of the sidewall and bottom wall are greater than a wall thickness of a body section of the container to be molded; preparing blow molding mold which has such internal shape that is greater than external shapes of the shoulder forming portion and the body forming portion and is substantially same as an external shape of the bottom forming portion; inserting the parison into the mold with the neck forming portion being held with such spaces that an outer sidewall and an outer bottom surface of the bottom forming portion of the parison are separated with a minute distance from a bottom inner periphery and a bottom inner surface of the mold, respectively; and blowing compressed air into the parison, thereby stretching the body forming portion of the parison in an axial direction and moving the bottom forming portion of the parison toward the bottom inner surface of the mold, causing the outer bottom surface of the bottom forming portion to abut on the inner bottom surface of the mold and causing an outer periphery of the bottom forming portion to abut on the bottom inner periphery of the mold, and restricting the movement of the bottom portion by such abutments, and thereafter, stretching the body forming portion in a lateral direction, and bringing the shoulder forming portion and the body forming portion into contact with inner surface of the mold. - View Dependent Claims (5, 6, 7, 8, 10, 11, 12, 13, 14, 15, 16, 17, 18)
-
Specification