Blow-Molded Container Liquid Layer Uniformity
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Solution Overview
Problem
Existing plastic containers with improved slipping properties for viscous fluid contents still face challenges in uniformly forming a thin liquid layer on the inner surface, leading to issues like adhesion and quality deterioration of contents.
Innovation Solution
A process for producing blow-formed containers involves blowing a fluid into a preform where a liquid is present, forming a thin liquid layer with specific viscosity and contact angle properties, ensuring uniform coverage and preventing adhesion of viscous contents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a liquid layer is formed on the inner surface by spraying or dipping after container formation, then slipping property is improved, but the liquid layer becomes too thick causing liquid migration into content
Solution Approach 1:
The liquid is introduced into the preform before blow-molding, allowing the liquid layer to be formed during the container formation process itself. This preliminary action ensures the liquid is uniformly distributed and prevents excessive thickness that would occur with post-formation spraying or dipping methods.
Solution Approach 2:
The invention replaces the mechanical spraying or dipping process with a blow-molding process that inherently forms the liquid layer. The blowing action simultaneously forms the container shape and distributes the liquid uniformly on the inner surface, eliminating the need for separate liquid application steps.
2Reliability
If liquid is mixed into the resin in large amounts to form inner surface layer, then slipping property is improved, but liquid remains in resin layer causing waste
Solution Approach 1:
The invention extracts the liquid from the bulk resin mixture and introduces it separately into the preform before blow-molding. This separation allows the liquid to be positioned precisely on the inner surface where it is needed for slipping property, preventing liquid entrapment in the resin layer and eliminating waste.
Solution Approach 2:
The preform serves as an intermediary carrier that introduces the liquid onto the inner surface during the blow-molding process. This intermediary approach allows controlled liquid distribution without direct mixing with resin, preventing liquid entrapment and waste while ensuring uniform coverage.
3Reliability
If chemical additives are used to improve slipping property, then adhesion resistance is improved to some extent, but striking improvement is limited due to resin and additive constraints
Solution Approach 1:
The invention changes the fundamental parameter from chemical composition modification to physical liquid layer formation. Instead of relying on chemical additives blended with resin, the invention introduces a separate liquid phase that provides slipping property through physical lubrication, enabling striking improvement beyond chemical additive limitations.
Solution Approach 2:
The invention creates a composite structure with the resin container wall and a separate liquid layer on the inner surface. This composite approach combines the structural integrity of the resin with the slipping properties of the liquid, achieving superior adhesion resistance that cannot be obtained by chemical additives alone.
4Reliability
If liquid layer is formed thinly and uniformly, then slipping property is improved without content quality deterioration, but difficulty remains in achieving uniform thin formation
Solution Approach 1:
The blow-molding process itself serves to uniformly distribute the liquid on the inner surface. The expanding preform automatically spreads the liquid evenly through the forming action, eliminating the need for separate precision coating equipment and achieving uniform thin layer formation through the self-service of the molding process.
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
The process results in a container with a uniformly thin liquid layer that effectively prevents adhesion and maintains lubrication, allowing quick discharge of viscous contents without quality deterioration.
Implementation Method 1
a liquid layer which is stretching together with the container wall while being pushed onto the container wall... exhibiting slipping property for the content
Data Source
Figure 1~2
AI summary
A blow-formed container having a liquid layer 3 formed in an amount of not more than 10 g/m2 on the whole inner surface of the stretched portion thereof. The container has a liquid layer that is thinly and uniformly formed on the inner surface thereof, the liquid layer exhibiting slipping property for the fluid content and enabling the container to exhibit excellent slip-down property maintaining stability.