Plastic Bottle Pre-Deformation for Pressure-Stable Filling
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Solution Overview
Problem
PET bottles, especially flat or oval ones, deform under internal nitrogen pressure, losing their shape and appearing underfilled due to fast-filling issues and water loss, leading to instability and reduced consumer appeal.
Innovation Solution
Mechanically deform the container before closing to increase its volume, followed by a pressure relief step to build internal pressure, enhancing stability and headspace while reducing material thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If nitrogen is used to build internal pressure in PET bottles, then the bottles can have reduced weight and wall thickness, but flat or oval bottles deform and lose their original shape
Solution Approach 1:
The bottle is pre-deformed into an expanded cross-sectional shape before filling. This preliminary action creates additional internal volume that compensates for the shape-changing effect of nitrogen pressure, allowing the bottle to maintain its intended shape despite the internal pressure buildup.
Solution Approach 2:
The invention changes the physical parameter of the bottle's cross-sectional dimensions by expanding it before filling. This parameter change increases the internal volume available to counteract the deformative effect of nitrogen pressure, resolving the contradiction between weight reduction and shape maintenance.
2Ease of manufacture
If bottles are filled to the top to avoid appearing underfilled, then consumer appeal increases, but fast-filling machines cause spillage and foam formation
Solution Approach 1:
The bottle is pre-expanded before filling to create additional headspace volume. This preliminary volume increase allows the bottle to accommodate filling foam and liquid surge without spillage, enabling high-speed filling while maintaining full appearance.
Solution Approach 2:
The invention utilizes the volume dimension by expanding the bottle's cross-sectional area. This dimensional change creates additional internal space that absorbs the effects of fast filling, allowing high productivity without sacrificing filling reliability or appearance.
3Ease of manufacture
If headspace is increased to accommodate filling variations, then filling reliability improves, but the bottle appears underfilled to consumers
Solution Approach 1:
The bottle is pre-expanded before filling to create additional headspace. After filling, the bottle is compressed back to its original shape, which reduces the headspace volume and makes the bottle appear fully filled to consumers while maintaining the filling reliability benefits.
Solution Approach 2:
The invention makes the bottle's volume dynamic by expanding it before filling and compressing it after filling. This dynamic volume adjustment allows the bottle to have large headspace during filling (improving reliability) and small headspace during display (improving consumer perception).
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 method increases the container's volume and internal pressure, making it more stable and visually appealing, with potential material savings and improved filling efficiency.
Implementation Method 1
the container, prior to being closed, is deformed by a mechanical force such that the cross-sectional shape of the container is changed and its volume is thereby increased, and that in a pressure relief step the mechanical force is removed once the container has been closed, as a result of which the volume contraction causes an excess pressure to build up in the closed container
Implementation Method 2
Since the plastics container is resilient, after the pressure has been released the container springs back to its original shape as best as possible. This causes the container to be pressurized.
Data Source
AI summary
A method for filling a plastics container, wherein an excess pressure is built up in the filled and closed container. The method includes the following method steps: filling the plastics container with a liquid, and closing the filled plastics container. In a deformation step, the container, prior to being closed, is deformed by a mechanical force such that the cross-sectional shape of the container is changed and its volume is thereby increased. In a pressure relief step, the mechanical force is removed once the container has been closed, as a result of which the volume contraction causes an excess pressure to build up in the container, and the filling height of the liquid increases.