Thermoplastic Bag Reinforcing Strip for Puncture Resistance
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Solution Overview
Problem
The challenge is to create a thermoplastic bag for trash receptacles that reduces material costs while maintaining strength and facilitating high-speed manufacturing, as reducing the amount or quality of thermoplastic material used in traditional bags leads to susceptibility to tearing or rupture.
Innovation Solution
Incorporating a reinforcing strip made of thermoplastic material, which can be either stronger or of the same strength as the bag sidewalls, attached to the bottom edge of the bag to enhance its durability, and using a manufacturing process that involves continuous webs processed through equipment for high-speed production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the amount or quality of thermoplastic material is reduced to lower production cost, then material cost decreases, but bag strength deteriorates and the bag becomes susceptible to tearing or rupture
Solution Approach 1:
The patent applies composite materials by combining thermoplastic bag material with a reinforcing strip made of different material (such as woven polypropylene or other high-strength materials). This composite structure allows the bag to maintain strength while using less expensive thermoplastic material, directly resolving the contradiction between material cost and bag strength.
Solution Approach 2:
The reinforcing strip is strategically placed at specific locations where stress concentration and rupture are most likely to occur, such as the bottom edge, corners, or areas subject to puncture. This localized reinforcement approach minimizes the amount of additional material needed while maximizing strength improvement in critical areas.
2Strength
If traditional bag design is used to maintain strength, then bag strength is preserved, but production cost increases due to higher material usage
Solution Approach 1:
By using composite materials with the reinforcing strip, the patent achieves the required bag strength with reduced thermoplastic material consumption, directly addressing the contradiction between maintaining strength and reducing material quantity.
Solution Approach 2:
The strategic placement of reinforcing strips at high-stress areas allows for significant reduction of thermoplastic material in non-critical areas while maintaining overall bag strength, thus reducing total material quantity without compromising performance.
3Strength
If complex reinforcing features are added to improve strength, then bag strength improves, but device complexity increases
Solution Approach 1:
The patent uses simple, localized reinforcing strips at specific critical areas rather than complex reinforcement throughout the entire bag. This approach improves strength where needed while keeping the overall structure simple and easy to manufacture.
Solution Approach 2:
The reinforcing strip can be implemented in various simple configurations (different materials, thicknesses, or attachment methods) to achieve the required strength level without increasing structural complexity. The design allows parameter optimization while maintaining simplicity.
Data Source
AI summary
A plastic bag with flexible sidewalls defining an interior volume for holding contents includes a reinforcing feature to resist puncture and/or rupture of the bag. The reinforcing feature may include reinforcing the portion of the bag proximate the bottom edge with additional or thicker thermoplastic material. In various embodiments, the reinforcing feature may be a multilayer strip of plastic material attached along a bottom edge of the bag, either internally or externally, to provide additional material resistant to puncture. The reinforcing feature may be adhesively bonded, heat bonded, or cold bonded to the bag sidewalls. In other embodiments, the sheet material used to produce the bag may be made with varying thicknesses. In addition, methods of manufacturing a bag with such reinforcing features in a high speed automated process are disclosed.