Biaxially Stretch Blow Molded Container Transparent Window Nozzle
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Biaxially stretch blow molded containers with transparent window portions face issues in maintaining transparency due to the mixture of colored resin, leading to visibility problems and deterioration in appearance.
Innovation Solution
An injection molding apparatus with a specific nozzle structure that separates and directs molten resins to form a clear, longitudinal strip-shaped window portion by laminating the transparent B resin as a slit extending to the center position, preventing mixing with the opaque A resin, ensuring the transparency and clarity of the window.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a transparent window portion is formed in a biaxially stretch blow molded container by conventional injection molding, then the window portion is intended to allow visibility of the remaining content, but the transparency deteriorates due to mixture of colored resin
Solution Approach 1:
The nozzle flow path is segmented into a first flow path for transparent resin and a second flow path for colored resin, with a partition wall separating them. This segmentation prevents mixing of the two resins during injection molding, ensuring the window portion maintains its transparency while the rest of the container has the desired color.
Solution Approach 2:
Different resin properties are applied to different portions of the container: the window portion uses transparent resin for visibility, while the rest of the container uses colored resin for branding or UV protection. The partitioned nozzle system enables precise local quality control by directing the appropriate resin to the appropriate location.
2Ease of manufacture
If conventional injection molding is used to form a window portion, then the process is relatively simple, but the transparent resin mixes with colored resin causing deterioration in appearance
Solution Approach 1:
The nozzle is divided into separate flow paths with a partition wall, creating distinct channels for transparent and colored resins. This segmentation maintains process simplicity while preventing resin mixing, as each resin flows through its dedicated path without interference from the other.
Solution Approach 2:
The partition wall acts as an intermediary structure between the two resin flow paths. It physically separates the transparent and colored resins during injection, preventing direct contact and mixing while allowing both resins to be injected simultaneously through the same nozzle assembly.
3Shape
If colored resin is supplied to the entire container including the window portion, then the container has uniform appearance, but the window portion loses its transparency function
Solution Approach 1:
The injection molding process is designed to supply different resin types to different locations: transparent resin is directed to the window portion through the first flow path, while colored resin is directed to the rest of the container through the second flow path. This local quality differentiation ensures both uniform appearance in the colored portions and transparency in the window portion.
Solution Approach 2:
The nozzle system segments the resin supply into distinct streams for different container portions. The partition wall creates separate flow paths that maintain resin identity throughout the injection process, ensuring the window portion receives only transparent resin while other portions receive colored resin.
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
To solve a problem associated with formation of a transparent window (212) portion in a biaxially stretch blow molded container (201) by a nozzle structure of an injection molding apparatus, provided is a biaxially stretch blow molded container that is formed with a clearly transparent window (212) portion in a longitudinal strip shape by effectively preventing mixture of a colored resin to the window portion.