Foamed Stretched Plastic Bottle Light-Shielding Gradient
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Solution Overview
Problem
Existing foamed plastic containers struggle to achieve a balance between light-shielding properties and mirror gloss, often compromising on one aspect due to the distribution and size of foamed cells, which affects their strength and practicality for reusing transparent containers.
Innovation Solution
A foamed and stretched plastic bottle design where foamed cells are distributed with lengths that gradually decrease from the outer surface toward the central portion and then increase toward the inner surface, achieving a high light-shielding property while maintaining strength and mirror gloss through a gradational distribution of cell lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If foamed cells are distributed over the whole wall portions to avoid thick non-foamed portions, then light-shielding property is improved, but foamed cells of very large sizes are distributed in the central portion causing strength to be very decreased
Solution Approach 1:
The patent applies local quality by creating different foamed cell size characteristics in different regions of the container wall. Specifically, the foamed cells in the central portion have different size parameters compared to those near the outer and inner surfaces. This regional differentiation allows the central portion to achieve adequate light-shielding without developing excessively large cells that would compromise structural strength.
2Object-affected harmful factors
If foaming is promoted to compensate for decreased light-shielding property in stretched bottles, then light-shielding property is improved, but bubbles become coarse on the outer surface side making it difficult to attain a high mirror gloss
Solution Approach 1:
The patent implements local quality by controlling foamed cell characteristics to vary across different regions of the container wall. The foamed cells near the outer surface are designed with different size parameters compared to those in the central portion or inner surface. This spatial variation enables the outer surface to maintain fine cell structures that produce high mirror gloss, while internal regions provide sufficient light-shielding through appropriately sized cells.
Solution Approach 2:
The patent addresses the contradiction by introducing dimensional variation in foamed cell sizes across the wall thickness direction. Rather than using uniform cell sizes throughout, the invention creates a gradient or differentiated distribution where cell dimensions change from the outer surface toward the inner surface. This dimensional approach allows simultaneous optimization of surface appearance (mirror gloss) and functional performance (light-shielding property) by exploiting the third dimension of wall thickness.
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 novel distribution of foamed cell lengths in the bottle provides excellent light-shielding properties without compromising strength and ensures a high mirror gloss, effectively addressing the limitations of previous designs.
Implementation Method 1
the foamed cells overlap less frequently in the direction of thickness. Therefore, multiplex reflection is not so much attained by the foamed cell-containing portion, and the light-shielding property tends to decrease conspicuously.
Implementation Method 2
the wall of the body portion has a decreased thickness and the foamed cells overlap less frequently in the direction of thickness
Data Source
AI summary
A foamed and stretched plastic bottle having, in the body portion thereof, a foamed region in which foamed cells are distributed, wherein, in at least a portion of the foamed region, the lengths of the foamed cells in the axial direction of the bottle are so distributed as to gradually decrease as the positions of the foamed cells shift from the outer surface side of the body portion toward the central portion thereof and then gradually increase as their positions shift from the central portion thereof toward the inner surface side thereof. The foamed and stretched plastic bottle of the invention exhibits excellent light-shielding property.