PET Container Ribs Prevent Inner Layer Peeling During Vapor Deposition
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Solution Overview
Problem
The existing delamination containers made by stretch blow molding polyethylene terephthalate (PET) have insufficient gas barrier properties, and forming a vapor-deposited film on the inner layer body can cause it to peel away from the outer layer body, leading to deformation and perforation during the vacuum process.
Innovation Solution
A synthetic resin-made container with a vapor-deposited film on the inner surface of the inner layer body, featuring ribs on the lower part of the barrel and bottom portions to prevent peeling, and a method involving stretch blow molding and blocking the outside air introduction port to maintain equal pressure inside and outside the inner layer body during vapor deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vapor-deposited film is formed on the inner surface of the inner layer body to enhance gas barrier property, then the gas barrier property is improved, but the inner layer body peels away from the outer layer body due to vacuuming during vapor deposition
Solution Approach 1:
The patent introduces ribs at specific locations (lower part of barrel portion and/or bottom portion) where peeling is most likely to occur during vacuum deposition. These ribs create localized structural reinforcement without modifying the entire container, providing targeted prevention of inner layer body peeling while maintaining the overall laminated structure.
Solution Approach 2:
The ribs are pre-formed on the outer layer body before the vapor deposition process. This preliminary structural preparation ensures that when vacuuming occurs during film formation, the inner layer body is already constrained by the ribs, preventing peeling before it can happen.
2Loss of substance
If the inner layer body is made thin to reduce material usage, then the amount of material is reduced, but the gas barrier property becomes insufficient
Solution Approach 1:
The patent combines the inner layer body (thin PET or PET-containing laminate) with a vapor-deposited film to create a composite structure. This composite provides superior gas barrier properties compared to the thin inner layer body alone, while still maintaining material reduction benefits.
Solution Approach 2:
The patent changes the physical state and properties of the inner layer body surface by forming a vapor-deposited film on it. This film deposition fundamentally alters the gas permeability parameters of the inner layer body, providing excellent gas barrier properties even when the inner layer body itself is thin.
3Stability of the object's composition
If ribs are formed to prevent peeling during vapor deposition, then the laminated structure stability is improved, but the device complexity increases
Solution Approach 1:
The ribs are introduced only at specific critical locations (lower barrel portion and/or bottom portion) where peeling is most likely to occur during vacuum deposition, rather than providing uniform reinforcement throughout the entire container. This localized approach prevents peeling while minimizing the increase in overall structural complexity.
Solution Approach 2:
The patent applies rib structures only partially at the most critical areas where peeling is most likely to occur during vapor deposition, rather than providing uniform reinforcement throughout the entire container. This partial action is sufficient to prevent the harmful peeling effect while minimizing added complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Prevents the inner layer body from peeling away from the outer layer body during vapor deposition, enhancing gas barrier properties and maintaining the integrity of the container.
Implementation Method 1
forming a vapor-deposited film having a gas barrier property on an inner surface of the inner layer body
Data Source
AI summary
A synthetic resin-made container is a synthetic resin-made container that has an outer layer body and an inner layer body separably laminated on an inner surface of the outer layer body and is formed by stretch blow molding, and includes: a tubular mouth portion; a barrel portion connected to and located below the mouth portion; and a bottom portion closing a lower end of the barrel portion, wherein the outer layer body contains polyethylene terephthalate, the inner layer body contains polyethylene terephthalate, a laminate containing polyethylene terephthalate, or a blend containing polyethylene terephthalate, and has a vapor-deposited film having a gas barrier property on an inner surface thereof, and a rib that prevents the inner layer body from peeling away from the outer layer body when forming the vapor-deposited film is formed in at least one of a lower part of the barrel portion and the bottom portion.