Phased Intermeshing Rollers for Stronger Trash Bag Seals
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Solution Overview
Problem
Conventional thermoplastic films used in bags suffer from continuous deformation patterns leading to weakened seals and potential leaks due to zippering effects and thinning, especially when forming side seals over areas with ring rolling or SELFing.
Innovation Solution
Thermoplastic bags with phased deformation patterns are created by aligning deformation zones relative to the bag's width, eliminating or reducing deformations in seal areas and varying patterns to enhance seal strength and liquid containment, using intermeshing rollers configured to match the bag's width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If continuous deformation patterns are applied across the entire bag width using conventional ring rolling or SELFing, then the film gains desirable elasticity and strength properties, but the side seals are weakened due to zippering effects and thinning
Solution Approach 1:
The deformation pattern is segmented into different zones across the bag width. The intermeshing rollers are configured with a circumference that is a multiple of the bag width, creating distinct deformation zones (first, second, and third zones) rather than a continuous uniform pattern. This segmentation allows the film to have desirable properties in some areas while maintaining seal integrity in others.
Solution Approach 2:
Different zones of the film are given different deformation qualities. The first and third zones have deformation patterns that provide elasticity and strength, while the second zone (seal area) has reduced or eliminated deformations to maintain uniform thickness and seal strength. This local differentiation resolves the contradiction between overall film strength and local seal reliability.
2Strength
If deformation patterns are applied across the entire bag width, then the film achieves enhanced material properties, but the film thickness is reduced in seal areas leading to pins holes and weaknesses
Solution Approach 1:
The film width is divided into multiple zones with different deformation applications. The intermeshing roller configuration creates distinct first, second, and third zones where deformation is applied selectively. This segmentation prevents uniform thinning across the entire width and maintains thickness uniformity in critical seal areas.
Solution Approach 2:
Deformation is applied with different intensities and patterns in different local zones. The seal area (second zone) maintains uniform thickness by having reduced or eliminated deformations, while other zones (first and third) receive deformation to enhance material properties without compromising thickness uniformity in the seal region.
3Productivity
If the intermeshing rollers are configured to span the entire bag width with continuous deformation, then the processing is simple and efficient, but the side seals experience zippering effects causing leaks and bag failure
Solution Approach 1:
The roller circumference is segmented into multiples of the bag width, creating distinct deformation zones that can be controlled independently. This segmentation allows the processing to remain efficient while preventing zippering effects in seal areas by eliminating deformations in the second zone where side seals are formed.
Solution Approach 2:
Different zones experience different deformation qualities: the first and third zones have deformation patterns for material enhancement, while the second zone (seal area) has reduced or eliminated deformations. This local differentiation maintains seal integrity and prevents zippering effects without significantly compromising processing efficiency.
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 phased deformation patterns provide stronger seals and improved leak resistance by ensuring uniform thickness and tailored material properties, allowing the bags to absorb forces without tearing, thus enhancing overall bag integrity and performance.
Implementation Method 1
The thermoplastic film is advanced into a pair of intermeshing rollers. The thermoplastic film is advanced through the intermeshing rollers to create deformations in the thermoplastic film.
Data Source
AI summary
Thermoplastic bags with phased deformation patterns are described. In particular, one or more implementations comprise thermoplastic bags with ring rolling, SELFing, or other deformation patterns phased or aligned relative to the sides of the bags. The phased deformation patterns can allow for reducing or eliminating deformation patterns in areas of the thermoplastic bag in which side seals or other seals are formed. Additionally or alternatively, the phased deformation patterns can provide for zones that provide differing properties (e.g., functional or aesthetic). Such zones can vary aligned along a width of the thermoplastic bag and optionally also vary along a height of the thermoplastic bag. The differing zones can provide the thermoplastic bags with phased deformations that provide leak prevention, liquid containment, and other benefits.