TEMPERATURE CONTROL APPARATUS FOR PREFORM, TEMPERATURE CONTROL METHOD FOR PREFORM, RESIN CONTAINER AND METHOD FOR PRODUCING RESIN CONTAINER

• US 20140131920A1
• Filed: 01/17/2014
• Published: 05/15/2014
• Est. Priority Date: 07/20/2011
• Status: Active Grant

• Current Assignee: Nissei ASB Machine Company Limited
• Original Assignee: Nissei ASB Machine Company Limited
• Inventors: NAKAHARA, Atsushi
• Granted Patent: US 9,393,728 B2
• Time in Patent Office: Days
• US Class Current: 264/328.16
• CPC Class Codes: B29B 11/08 Injection moulding
• CPC Class Codes: B29B 11/14 characterised by structure or composition
• CPC Class Codes: B29C 2049/023 using inherent heat of the preform, i.e. 1 step blow moulding
• CPC Class Codes: B29C 2949/0715 the preform having one end closed
• CPC Class Codes: B29C 2949/072 having variable wall thickness
• CPC Class Codes: B29C 2949/0772 Closure retaining means
• CPC Class Codes: B29C 2949/078 characterised by the bottom
• CPC Class Codes: B29C 2949/0817 of the body
• CPC Class Codes: B29C 2949/0818 of the bottom
• CPC Class Codes: B29C 45/78 of temperature
• CPC Class Codes: B29C 49/06 Injection blow-moulding
• CPC Class Codes: B29C 49/071 Preforms or parisons characterised by their configuration, e.g. geometry, dimensions or physical properties
• CPC Class Codes: B29C 49/6427 Cooling of preforms
• CPC Class Codes: B29C 49/6445 through the preform length
• CPC Class Codes: B29C 49/78 Measuring, controlling or regulating
• CPC Class Codes: B29C 49/786 Temperature
• CPC Class Codes: B29K 2067/003 PET, i.e. poylethylene terephthalate
• CPC Class Codes: B29L 2031/712 Containers; Packaging elements or accessories, Packages closures therefor B29L2031/56; ink or toner cartridges B29L2031/7678; squeeze tubes B29L2023/20; suitcases B29L2031/7418

Abstract

The outer circumferential surface of a bottom 4 of a preform 1 and a lower site 3a of a trunk 3 continuous with the bottom 4 is mechanically brought into intimate contact with a cooling pot 16 to undergo reliable cooling. The trunk 3, excluding the lower site 3a of the trunk 3 continuous with the bottom 4, is heated to a predetermined temperature by a heating block 17. When blow-molded, the so treated preform 1 can provide a container having a bottom of a desired thickness and having a uniformly stretched thin-walled trunk.

Claims

1. A temperature control apparatus for a preform, comprising:

a temperature control pot contacting an outer circumferential surface of a bottom of a bottomed preform and a part of a peripheral portion of the bottomed preform continuous with the bottom;

a temperature control block disposed outside the peripheral portion of the bottomed preform; and

pressing drive means for allowing the temperature control pot to intimately contact and hold a bottom wall surface of the bottomed preform.

2. A temperature control apparatus for a preform, comprising:

a temperature control pot for holding an outer circumferential surface of a bottom of a bottomed preform and a part of a peripheral portion of the bottomed preform continuous with the bottom;

a temperature control block disposed outside the peripheral portion of the bottomed preform;

a temperature control core inserted into an inside of the bottomed preform, and having a leading end portion contacting an inner circumferential surface of the bottom and the part of the peripheral portion continuous with the bottom; and

pressing drive means for holding a bottom wall surface of the bottomed preform between the temperature control pot and the temperature control core, and bringing the temperature control pot and the temperature control core close to each other relatively so as to make intimate contact with the bottom and the part of the peripheral portion and hold them.

3. The temperature control apparatus for a preform according to claim 2, wherein

the temperature control pot is a pot for cooling,

the temperature control core is a core for cooling, and

the temperature control block is a block for heating.

4. The temperature control apparatus for a preform according to claim 3, wherein

the bottomed preform has the bottom increased in wall thickness relative to the peripheral portion continuous with the bottom, the wall-thickened bottom being disposed between the temperature control pot and the temperature control core.

5. A temperature control method for a preform, comprising:

forming a bottomed preform by injection molding, the bottomed preform having a bottom and a peripheral portion continuous with the bottom, and having a wall thickness of the bottom increased relative to the peripheral portion;

bringing an outer circumferential surface of the bottom of the bottomed preform and a part of the peripheral portion continuous with the bottom into intimate contact with a temperature control pot, while holding the outer circumferential surface by the temperature control pot, for temperature control; and

relatively heating a site of the peripheral portion, excluding the part of the peripheral portion continuous with the bottom of the bottomed preform, to a predetermined temperature.

6. The temperature control method for a preform according to claim 5, wherein

the bottom and the part of the peripheral portion continuous with the bottom are disposed between a pot for cooling and a core for cooling, and

the pot for cooling and the core for cooling are brought close to each other,

whereby the outer circumferential surface of the bottom and the part of the peripheral portion continuous with the bottom is cooled upon intimate contact with the pot for cooling, and an inner circumferential surface of the bottom and the part of the peripheral portion continuous with the bottom is cooled upon intimate contact with the core for cooling.

7. The temperature control method for a preform according to claim 6, wherein

the peripheral portion of the bottomed preform, excluding the bottom and the part of the peripheral portion continuous with the bottom, is relatively heated to a predetermined temperature either in a completely noncontact state, or in a partly contacted state on an inner circumferential surface of the peripheral portion.