Bottle Deformable Tube Part Density via Double Blow Molding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Bottles formed by biaxial stretch blow molding tend to have increased material usage due to material accumulation at the deformable tube part, leading to reduced heat resistance and potential deformation under high-temperature contents, while attempts to reduce thickness compromise reduced-pressure absorbing performance.
Innovation Solution
The method employs double blow molding with primary and secondary blow molding processes, along with heat treatment, to enhance the density and heat resistance of the deformable tube part, allowing for thinner structures without compromising reduced-pressure absorbing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the thickness of the deformable tube part is reduced to decrease material usage, then material accumulation is reduced, but heat resistance of the deformable tube part cannot be secured
Solution Approach 1:
The patent applies parameter changes by modifying the density of the deformable tube part through double blow molding. Instead of changing thickness, the invention changes the density parameter to maintain heat resistance while reducing material usage. The double blow molding process creates a higher density structure that provides thermal resistance without requiring increased thickness.
Solution Approach 2:
The patent effectively creates a composite structure through double blow molding, where the deformable tube part has a differentiated density composition. The process creates layers with different densities - a denser outer layer for heat resistance and a less dense inner structure for deformability - functioning similarly to composite materials with optimized properties.
2Loss of substance
If the thickness of the deformable tube part is reduced to decrease material usage, then material accumulation is reduced, but reduced-pressure absorbing performance cannot be secured
Solution Approach 1:
The patent changes the density parameter of the deformable tube part through double blow molding to maintain reduced-pressure absorbing performance while reducing material usage. The optimized density distribution allows the thinner structure to still deform appropriately under pressure differential while using less material.
3Temperature
If the bottom mold temperature is raised to improve heat resistance of the deformable tube part, then heat resistance is improved, but the deformable tube part is easily hardened so that reduced-pressure absorbing performance cannot be secured
Solution Approach 1:
The patent changes the density parameter through double blow molding as an alternative to changing temperature. By optimizing the density of the deformable tube part, the invention achieves heat resistance without requiring high bottom mold temperatures, thereby avoiding the hardening effect that would compromise reduced-pressure absorbing performance.
Solution Approach 2:
The patent replaces the thermal approach (raising bottom mold temperature) with a structural approach (modifying density through double blow molding). Instead of using heat to achieve heat resistance, the invention uses structural density optimization, substituting a thermal solution with a mechanical/structural solution.
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
This approach enables the deformable tube part to be thinned while maintaining heat resistance and reduced-pressure absorbing performance, even at lower bottom mold temperatures, ensuring the bottle's integrity under varying pressures.
Implementation Method 1
the bottle is formed by so-called double blow molding having the primary blow molding process, the heat treatment process, and the secondary blow molding process
Implementation Method 2
the bottle is formed by so-called double blow molding having the primary blow molding process, the heat treatment process, and the secondary blow molding process
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A method for manufacturing a bottle including forming the bottle (10) that is formed in a bottomed tubular shape and has a bottom wall section (19) provided with a contact part (18) positioned at an outer circumferential edge thereof and a deformable tube part that is of a multilevel topped tubular shape, is provided upright at the contact part (18), and blocks an inside of the contact part (18); the method having a primary blow molding process of performing biaxial stretch blow molding on a preform to obtain a primary intermediate molded article; a heat treatment process of heating the primary intermediate molded article to be forcibly shrunken and molded into a secondary intermediate molded article; and a secondary blow molding process of performing blow molding on the secondary intermediate molded article to obtain the bottle (10).