Zipper Tape with Variable Bonding Strength for Steam Venting
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Solution Overview
Problem
Existing steam vent mechanisms in cooking bags require complex production processes and difficult zipper tape engagement structures, complicating the manufacturing of bags that can vent steam during cooking without bursting.
Innovation Solution
A zipper tape with belt-shaped bases and engagement portions, where one portion has a higher bonding strength to the film than the other, allowing for easy peeling and venting of steam when internal pressure increases, simplifying the production process and ensuring the bag does not burst during cooking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a weakened seal steam vent mechanism is provided on the bag, then steam venting function is achieved, but the production process becomes complicated
Solution Approach 1:
The invention merges the steam venting function with the zipper tape structure itself. The zipper tape includes a first portion with strong bonding and a second portion with weak bonding, where the weak bonding portion automatically peels off during cooking to vent steam. This eliminates the need for a separate weakened seal mechanism, thereby simplifying the production process while maintaining the steam venting function.
Solution Approach 2:
The zipper tape is designed to serve multiple functions: it provides the sealing function through the engagement portion, and simultaneously provides the steam venting function through the weak bonding portion that peels off during cooking. This multi-functionality eliminates the need for separate components, reducing production complexity.
2Reliability
If an engagement structure with partial disengagement capability is devised, then steam venting during expansion is achieved, but the zipper tape production becomes difficult
Solution Approach 1:
The zipper tape is designed with different bonding strengths at different locations. The first portion has strong bonding strength to maintain sealing, while the second portion has weak bonding strength to allow easy peeling for steam venting. This local differentiation of bonding quality enables automatic steam venting during expansion without requiring complex engagement structures, making the zipper tape easier to manufacture.
Solution Approach 2:
The invention changes the bonding strength parameter of the zipper tape at different portions. By controlling the bonding strength of the adhesive layer or the physical properties of the tape material itself, the first portion maintains strong bonding while the second portion has weak bonding, enabling automatic peeling during cooking without complex mechanical engagement structures.
3Reliability
If the zipper tape is strongly bonded to the film, then sealing reliability is improved, but steam venting becomes difficult
Solution Approach 1:
The zipper tape is designed with spatially varying bonding characteristics. The first portion has strong bonding strength to ensure reliable sealing, while the second portion has weak bonding strength to facilitate easy peeling for steam venting. This local quality differentiation resolves the contradiction between strong bonding for sealing and easy peeling for steam venting.
4Ease of operation
If the zipper tape is weakly bonded to the film, then easy peeling is achieved, but sealing reliability deteriorates
Solution Approach 1:
The invention applies different bonding strengths at different locations of the zipper tape. The first portion has strong bonding to ensure sealing reliability, while the second portion has weak bonding to enable easy peeling for steam venting. This local differentiation allows the tape to simultaneously achieve both strong sealing where needed and easy peeling where required.
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 zipper tape effectively vents steam without requiring additional components, preventing bag bursting and simplifying the manufacturing process by using a design that allows for easy peeling of the weaker bonded portion, ensuring the bag remains intact during cooking.
Implementation Method 1
the first belt-shaped base includes at least two portions including a first portion exhibiting a first bonding strength and a second portion exhibiting a second bonding strength different from the first bonding strength when the zipper tape is bonded to the film
Data Source
AI summary
A zipper tape includes a pair of belt-shaped bases bondable to a film of a bag body, and mutually engageable engagement portion each integrally provided to corresponding one of the belt-shaped bases. One of the belt-shaped bases includes at least two portions having different bonding strengths to the film on a side opposite a side provided with the engagement portion and between an edge of the one of the belt-shaped bases in a width direction orthogonal to a longitudinal direction to a point at which the engagement portions are provided. A bonding strength of a first portion of the at least two portions to the film may be larger than a bonding strength of a second portion to the film.