Polypropylene sheets and articles
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Solution Overview
Problem
Existing transparent polymeric materials do not effectively craze or whiten in response to deformation, making it difficult to visually indicate information such as content, date, or tampering, and are often not recyclable or require complex formulations.
Innovation Solution
A polypropylene-based sheet with a specific composition of polypropylene base and secondary resins, including antistatic agents, is used to create a lid that deforms to indicate information through crazing, maintaining transparency until deformed, and is recyclable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If existing transparent polymeric materials are used, then transparency is maintained, but the ability to visually indicate information through deformation is lost
Solution Approach 1:
The patent changes the chemical composition parameters of the polymeric material by incorporating specific additives (antistatic agents, rubber particles, nucleating agents) in controlled amounts. This enables the material to exhibit crazing behavior upon deformation, transforming it from a simple transparent material to one that provides visual information through optical property changes when deformed.
Solution Approach 2:
The patent creates a composite polymeric material system combining base resin with multiple functional additives including antistatic agents, rubber particles, and nucleating agents. This composite structure enables both transparency in the undeformed state and visual indication through crazing when deformed, resolving the contradiction between maintaining transparency and enabling visual information indication.
2Loss of information
If complex formulations are used to achieve deformation indication, then visual indication capability is improved, but recyclability is reduced
Solution Approach 1:
The patent carefully controls the concentration parameters of additives within specific ranges (e.g., antistatic agent at 0.01-5 parts by weight per 100 parts resin, rubber particles at 1-20 parts by weight per 100 parts resin) to achieve the minimum necessary formulation complexity that provides deformation indication while maintaining recyclability.
Solution Approach 2:
The patent introduces localized functional components (rubber particles, nucleating agents, antistatic agents) distributed within the polymeric matrix at specific concentrations. These localized additions provide the necessary crazing behavior for visual indication without requiring complex formulation throughout the entire material structure, thus preserving recyclability.
3Loss of information
If polymeric materials that craze effectively are used, then visual indication is improved, but material fracture in cold environments occurs
Solution Approach 1:
The patent creates a composite system where rubber particles (1-20 parts by weight per 100 parts resin) are dispersed within the polymeric matrix. These rubber inclusions act as stress concentrators that promote controlled crazing for visual indication while simultaneously serving as toughness enhancers that prevent catastrophic fracture in cold environments.
Solution Approach 2:
The patent incorporates rubber particles and impact modifiers into the polymeric material formulation before processing. These components provide pre-positioned stress concentration points and energy absorption capacity that cushion against sudden impacts and prevent fracture in cold temperatures while enabling the desired crazing behavior for visual indication.
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 polypropylene-based lid effectively changes transparency upon deformation, allowing visual indication of content or tampering while being recyclable and avoiding material fracture in cold environments.
Implementation Method 1
Existing transparent polymeric materials do not effectively craze or whiten in response to deformation... The polypropylene-based sheet with a specific composition... is used to create a lid that deforms to indicate information through crazing
Data Source
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AI summary
A sheet of polymeric material is made using an extruding process and articles are formed from the sheet of polymeric material. The sheet of polymeric material and the articles comprise one or more polypropylene resins. In some embodiments, the sheet of polymeric material and the articles formed form the sheet of polymeric material are transparent.