Multi-layered preform and multi-layered bottle manufactured by using the same

a technology of multi-layered bottles and preforms, which is applied in the direction of synthetic resin layered products, transportation and packaging, and other domestic articles, can solve the problems of generating turbulence of resin flow, affecting the quality of molded products, and preforms showing poor appearance characteristics, etc., to enhance oxygen barrier properties, improve the quality of molded products, and improve the effect of elasticity

Inactive Publication Date: 2002-07-25
TOYO SEIKAN KAISHA LTD
View PDF2 Cites 27 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

0034] As the oriented thermoplastic resin which is used as the material of the inner layer and the outer layer of the present invention, any arbitrary resin can be used so long as the resin can be subjected to the stretch blow molding and can be crystallized under heat. Thermoplastic polyester such as polyethylene terephthalate, polybutylene terephtalate, polyethylene naphthalate, polycarbonate, polyarylate or a copolymer thereof or the like, a blend of these resins or a blend of these resins and other resins is preferably used. Ethylene-terephtalate-based thermoplastic polyester such as polyethylene terephtalate or the like can be more suitably used.
0035] Further, acrylonitrile resin, polypropylene, propylene-ethylene copolymer, polyethylene or the like can be also used.
0036] Into these resins, various kinds of additives, for example, a coloring agent, a ultraviolet lays absorption agent, a mold lubricant, a lubricant, a nucleus agent, an oxidation prevention agent, a charging prevention agent and the like can be blended within a range which does not damage the quality of a molded product.
0037] In the ethylene-terephtalate-based thermoplastic polyester resin which is used for forming the inner layer and the outer layer in the present invention, the substantial portion, generally not less than 70 mol % of ester repeating units is occupied by the ethlene terephtalate units and it is preferable that the glass transition point (Tg) is set in a range from 50 to 90.degree. C. and the melting point is set in a range from 200 to 275.degree. C. In the ethylene-terephtalate-based thermoplastic polyester resin, polyethylene terephtalate (PET) exhibits the particularly excellent

Problems solved by technology

In a single-layered preform manufactured by a conventional injection molding, at a gate portion of a bottom portion or in the vicinity of the gate portion, the turbulence of a resin flow is generated and the whitening is liable to occur.
Accordingly, there has been a problem that a bottle obtained by performing the biaxial stretch blow molding of the preform exhibits the poor appearance characteristics such as whitening, the crazing or the like of the bottom portion and reduces the impact resistance.
With respect to the multi-layered preform manufactured by the injection molding and the bottle obtained by performing the biaxial stretch blow molding using such a multi-layered preform, since a plurality of resins are injected, the respective flows of the resins become more complicated and this tendency appears particularly noticeably.
Further, with respect to a multi-layered preform obtained by performing an injection molding of oriented thermoplastic resin such as polyethylene terephthalate or the like, even when a body portion is tra

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Multi-layered preform and multi-layered bottle manufactured by using the same
  • Multi-layered preform and multi-layered bottle manufactured by using the same
  • Multi-layered preform and multi-layered bottle manufactured by using the same

Examples

Experimental program
Comparison scheme
Effect test

experiment 1

[0064] (Experiment 1)

[0065] Polyethylene terephthalate (PET) having an intrinsic viscosity of 0.75 dl / g was supplied to an extruder for inner layer and outer layer and polymetaxylylene adipamido (MXD6 made by Mitsubishi Gasu Kagaku Kabushiki Kaisha) was supplied to an extruder for intermediate layer. Under the condition that the die temperature was set to 270.degree. C. and the resin pressure was set to 70 kgf / cm , these materials are extruded together such that the PET resin seals the MXD6 resin and they were cut into a given molten resin lump. This molten resin lump was set in the inside of a compression mold and the multi-layered compression forming was performed under the condition that the mold fastening pressure was set to 100 kgf / cm.sup.2 thus manufacturing a three-layered preform whose inner layer and outer layer were made of the PET and whose intermediate layer was made of the MXD6. A unit weight (METSUKE) of the preform was 25 g and the ratio of the intermediate layer was ...

experiment 2

[0066] (Experiment 2)

[0067] Except for that the resin which was produced by recycling the PET bottles collected from markets (PCR) was used as the intermediate layer, the multi-layered compression molding was performed under the same condition as the experiment 1 and a three-layered preform having the inner and outer layers made of the PET and the intermediate layer made of the recycled resin was manufactured. A unit weight (METSUKE) of the preform was 25 g and the ratio of the intermediate layer was 30 volume %.

experiment 3

[0068] (Experiment 3)

[0069] The three-layered preform of the first experiment was heated up to a temperature of 110.degree. C. which is not less than the glass transition point of the PET and this preform was set in the inside of a mold which is heated up to 60.degree. C. and a biaxial stretch blow molding was performed thus obtaining the three-layered bottle having a content of 500 cc.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Electrical resistanceaaaaaaaaaa
Cracking resistanceaaaaaaaaaa
Login to view more

Abstract

A multi-layered preform for substantially preventing the generation of strains and obtaining improved stress cracking resistance with excellent appearance characteristics includes a mouth portion, a body portion and a bottom portion and has at least the body portion and the bottom portion formed of an inner layer, an intermediate layer, and an outer layer by a compression molding. A multi-layered bottle is manufactured by performing a biaxial stretch blow molding of such multi-layered perform. The multi-layered bottle includes a mouth portion, a shoulder portion, a body portion and a bottom portion. At least the shoulder portion, the body portion and the bottom portion include an inner layer, an intermediate layer and an outer layer.

Description

[0001] 1. Field of the Invention[0002] The present invention relates to a multi-layered preform which is formed by performing a compression molding of a plural kinds of oriented thermoplastic resins and a multi-layered bottle which is formed by performing a biaxial stretch blow molding of the multi-layered preform, and more particularly to a multi-layered preform and a multi-layered bottle having layers each of which has no strain generated by the flow orientation at a bottom portion thereof and also exhibits the excellent environmental stress resistance (ESC property), the excellent impact resistance, the excellent strength and the excellent appearance characteristics of the bottom portion thereof.[0003] 2. Description of the Prior Art[0004] Stretch blow molded bottles made of polyester, polypropylene, polyamide or the like, particularly polyester bottles exhibit the excellent transparency and the gas barrier property and hence, the stretch blow molded bottles have been widely used...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): B65D1/00B29B11/00B29B11/12B29C43/20B29C49/00B29C49/08B29C49/22B32B1/02B32B27/00B32B27/36B65D1/02
CPCB29B11/12B29B2911/1402B29B2911/14053B29B2911/1406B29B2911/14066B29B2911/1408B29B2911/14093B29B2911/1412B29B2911/14226B29B2911/14326B29B2911/14333B29B2911/1444B29B2911/14466B29B2911/14633B29B2911/1498B29C43/203B29C43/361B29C49/0073B29C49/221B29C2043/3433B29C2043/3466B29K2067/00B29K2105/253B29K2105/26B29L2001/00B29L2009/00B32B1/02B32B27/36B65D1/0215Y10T428/1379Y10T428/1383Y10T428/1352Y10T428/1393B29C2949/3009B29C2949/3016B29C2949/302B29C2949/22B29C2949/3008B29C2949/3012B29C2949/3028B29C2949/306B29C2949/0723B29C2949/0722B29C2949/0724B29C2949/0732B29C2949/0731B29C2949/072B29C2949/0733B29C2949/073B29C2949/0777B29C2949/0817B29C2949/0773B29C2949/0872B29C49/071B29C2949/3032B29C49/42832
Inventor KIKUCHI, ATSUSHIHAMADA, YORIHISAETOH, MAKOTOWATANABE, KAZUNOBU
Owner TOYO SEIKAN KAISHA LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap