Multi-Film Thermoplastic Bag Conjoined Hem Channels
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Solution Overview
Problem
Multi-layer thermoplastic bags experience issues with durability, such as friction and mechanical engagement problems in the hem channel, leading to inversion and bunching of inner layers, and are prone to tearing when grasped or lifted, which affects their quality perception by customers.
Innovation Solution
The implementation of bonded or conjoined layers in the hem channels of thermoplastic bags to prevent inner layer inversion and bunching, and the use of contact areas in grab zones to increase stiffness and provide tactile cues of strength, using techniques like heat and pressure to create bonds that absorb forces before film failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple thinner layers are used to reduce material cost, then production cost decreases, but durability and resistance to mechanical engagement problems worsen
Solution Approach 1:
The patent merges multiple thinner film layers into a single integrated hem channel structure where the layers are conjoined together. This combining approach allows the bag to use less total material while maintaining durability through the unified structure that prevents layer separation and inversion during use.
Solution Approach 2:
The patent creates a composite hem channel structure by bonding multiple thermoplastic film layers together. This composite construction provides the benefits of using thinner materials (cost reduction) while the bonded layers work together as a single unit to provide the necessary strength and resistance to mechanical engagement problems.
2Quantity of substance
If thinner gauge films are used to reduce material cost, then production cost decreases, but resistance to tearing and puncturing worsens
Solution Approach 1:
The patent combines multiple thinner film layers into a conjoined hem channel structure. This merging allows the bag to use less material overall while the combined structure provides enhanced resistance to tearing and puncturing that would occur in single-layer thin films.
Solution Approach 2:
The patent creates a composite structure by bonding multiple thin film layers together in the hem channel. This composite construction provides the necessary strength and tear resistance while using less material than a single thick layer would require.
3Ease of manufacture
If the hem channel uses separate unbonded layers, then manufacturing is simpler, but friction and mechanical engagement cause inner layer inversion and bunching
Solution Approach 1:
The patent merges the hem channel layers into a conjoined structure where the layers are bonded together. This merging eliminates the friction and mechanical engagement problems that cause inversion and bunching, making the drawtape operation smoother and more reliable.
Solution Approach 2:
The patent creates a composite hem channel structure by bonding multiple layers together. This composite construction provides a unified surface that reduces friction and prevents the inner layer from inverting or bunching during drawtape operation.
4Quantity of substance
If the top of the bag uses thin material to maintain cost effectiveness, then material cost decreases, but susceptibility to puncturing and stretching by fingers increases
Solution Approach 1:
The patent merges multiple film layers into a conjoined hem channel structure at the top of the bag. This merging provides enhanced resistance to puncturing and stretching by fingers while maintaining cost effectiveness through the use of thinner individual layers.
Solution Approach 2:
The patent creates a composite structure at the top of the bag by bonding multiple thin film layers together. This composite construction provides the necessary resistance to mechanical damage from fingers while using less material than a single thick layer would require.
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 bonded hem channels reduce friction and force required to cinch the bag, enhance the tactile feel of strength, and prevent tearing, thereby improving the durability and perceived quality of the bags.
Implementation Method 1
The bonds can comprise heat seals
Implementation Method 2
The bonds can comprise pressure seals
Implementation Method 3
the bonded layers of the hem channels can increase stiffness of the hem channel
Implementation Method 4
bonds that absorb forces before film failure
Data Source
AI summary
One or more implementations of a multi-film thermoplastic bag with a conjoined hem channel. For example, the multi-film thermoplastic bag includes a multi-film hem channel. Bonds secure the layers of the hem channel together so as to prevent a drawtape from inverting or bunching an inner layer of the hem channel during cinching. The bonds are thus located in a hem channel of a multi-film thermoplastic bag so as to reduce an amount of mechanical engagement between the films of the multi-film thermoplastic bag and another thermoplastic film such as a drawtape. In one or more implementations, a grab zone of the multi-film thermoplastic bag also includes bonds in the form of contact areas to provide tactile and visual cues of strength in the grab zone.