PET Blow Molded Container Adhesive Closure Spout
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Solution Overview
Problem
Blow molded containers from polyolefin materials often suffer from leaks and damage, which can soil other products, and forming raised edges or flanges for spout closures is impractical due to strain hardening during the blow molding process of PET materials.
Innovation Solution
A container with a dispensing spout closed by an adhesive attachment to a bulge portion, allowing for a smooth spout shape and integral formation during blow molding, utilizing PET's adhesive properties to secure the closure without additional anchoring projections, and employing a gap-filling adhesive for leak-tight sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If raised edges or flanges are formed at the spout for anchoring closure during blow molding, then the closure can be securely anchored, but the spout requires additional deformation beyond the limits imposed by strain hardening of PET material
Solution Approach 1:
The patent replaces the mechanical anchoring system (raised edges, flanges, or other deformation-based anchoring features) with an adhesive bonding system. The closure is anchored to the spout through adhesive application, eliminating the need for complex spout deformations that would exceed PET material limits during blow molding.
Solution Approach 2:
The patent introduces adhesive as an intermediary substance between the spout and closure. This intermediary enables reliable anchoring of the closure without requiring the spout to undergo additional deformation beyond what is achievable during standard blow molding of PET material.
2Productivity
If the spout is made slender with minimal deformation during blow molding, then the container allows greater expansion, but traditional anchoring methods require additional deformation of the wall material
Solution Approach 1:
The patent substitutes mechanical anchoring (which would require additional spout deformation) with adhesive bonding. This allows the spout to remain slender with minimal deformation during blow molding, enabling greater container expansion while still achieving reliable closure anchoring through adhesive application.
3Strength
If PET material is stretched beyond natural stretch ratio to achieve strain hardening, then stiffness and strength increase, but formation of anchoring features becomes impracticable
Solution Approach 1:
The patent replaces mechanical anchoring features (which would require additional deformation of already strain-hardened material) with adhesive bonding. This allows the PET material to be stretched to its natural limits for optimal strength while avoiding the impracticable formation of raised edges or flanges on the spout.
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 solution provides a leak-tight and durable container with reduced deformation and increased resistance to damage, allowing for a slender spout with minimal additional deformation, and integrates functionalities like controlled pouring without requiring additional sealing members or finishing operations.
Implementation Method 1
Much of the commercial success of PET lies in the fact that it crystallizes at large strains during warm deformation processing. The imparted crystallinity increases its stiffness and strength, improves its dimensional stability, and increases its density.
Implementation Method 2
it is sufficient to form a bulge without anchoring recesses or projections and instead an adhesive can be used to fix the closure to the spout
Data Source
Figure 1~2
Figure 3~4
Figure 5~8
AI summary
A blow molded container of Polyethylenterephthalat (PET) or a similar thermoplastic polymer resin for storing fluid products comprises an injection molded neck and a spout (6) comprising a bulge portion (10) integral with the container body (2) and provided with a spout passage (12) and a closure (8) for closing off the passage. The closure (8) is attached to the bulge portion (10) by an adhesive (14). A method of manufacturing such a container is also described.