Heat-shrinkable Plastic Element for Preform Insertability
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Solution Overview
Problem
Conventional heat-shrinkable plastic elements used in blow-molding processes face challenges in insertability and production efficiency due to high contact resistance with preforms, particularly when using polystyrene or polyester resins, which hinder the winding and molding processes.
Innovation Solution
A heat-shrinkable plastic element comprising at least one layer containing ionomer resin and olefin resin, specifically polypropylene, which improves friction coefficients and moldability, allowing for better insertability and production efficiency by reducing contact resistance and enhancing the interaction with polyethylene terephthalate preforms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional heat-shrinkable plastic elements (polystyrene or polyester resins) are used, then heat resistance and shrinkage properties are maintained, but insertability and production efficiency deteriorate due to high contact resistance with preforms
Solution Approach 1:
The patent applies composite materials by combining ionomer resin (providing heat resistance) with olefin resin (providing low friction coefficient). This composite structure maintains the necessary thermal properties while significantly reducing contact resistance between the heat-shrinkable element and the preform, thereby improving insertability and production efficiency without sacrificing heat resistance
Solution Approach 2:
The patent changes the material parameters by selecting specific resin combinations with controlled friction coefficients. By adjusting the composition ratio of ionomer to olefin resin and selecting appropriate resin types, the friction coefficient is optimized to reduce contact resistance during insertion while maintaining adequate heat resistance for the blow-molding process
2Manufacturing precision
If skilled techniques are used for inserting preform into heat-shrinkable plastic element, then composite preform quality is improved, but production complexity and time consumption increase
Solution Approach 1:
The patent changes the friction coefficient parameter of the heat-shrinkable plastic element by using ionomer-olefin resin composite. This parameter change allows the preform to be inserted with much less skill and effort, reducing production complexity and training requirements while maintaining or improving composite preform quality through more consistent insertion
3Ease of operation
If friction coefficient between heat-shrinkable plastic element and preform is reduced, then insertability is improved, but bonding strength may deteriorate
Solution Approach 1:
The patent carefully balances the friction coefficient parameter by selecting specific ionomer-olefin resin combinations. The friction coefficient is reduced enough to improve insertability but maintained at a level that provides adequate bonding strength during the blow-molding process, achieving an optimal balance between ease of insertion and structural integrity
Solution Approach 2:
The composite material structure provides dual functionality: the olefin resin component reduces friction for easy insertion while the ionomer resin component maintains adequate bonding strength through its unique ionic cross-linking structure, resolving the contradiction between insertability and bonding strength
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 use of ionomer and olefin resins in the heat-shrinkable plastic element significantly improves insertability and production efficiency by reducing friction coefficients and enhancing the interaction with preforms, leading to improved blow moldability and recyclability.
Implementation Method 1
heat-shrinkable plastic element
Data Source
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AI summary
A heat-shrinkable plastic element that can notably improve insertability of a preform is provided. The heat-shrinkable plastic element is disposed on at least part of the outside of a preform, the preform including a mouth part, a body part linked to the mouth part, and a bottom part linked to the body part, the heat-shrinkable plastic element including: at least a layer containing (A) an ionomer resin and (B) an olefin resin as essential constituents, wherein the heat-shrinkable plastic element has a storage modulus at 25°C of at least 4.0×108 Pa, and the dynamic friction coefficient between the heat-shrinkable plastic element and the preform is at most 1.1.