Block Bottom Bag Venting With Transparent Viewing Windows
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Solution Overview
Problem
Block-bottom bags face limitations when packaging greasy and hot foods, as they accumulate water vapor, leading to loss of crispiness and poor product presentation, especially when goods are not visible to customers until purchase.
Innovation Solution
A manufacturing method that involves perforating a sheet along a longitudinal direction, applying a transparent film to create a viewing window, and processing it into a block-bottom bag, allowing vapor escape while maintaining product visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a block-bottom bag is made of greaseproof paper, then it provides greaseproofing, but water vapor accumulates inside causing loss of crispiness
Solution Approach 1:
The greaseproof paper is provided with a perforation structure comprising multiple perforations arranged in a predetermined pattern. These perforations create controlled porous pathways that allow water vapor to escape from the bag interior while the greaseproof paper material itself maintains its grease barrier properties. This resolves the contradiction by introducing a porous structure that selectively permits vapor transmission while blocking grease.
Solution Approach 2:
The invention combines greaseproof paper with a transparent film to create a composite packaging structure. The greaseproof paper layer provides greaseproofing, while the transparent film layer provides visibility and can be designed with appropriate permeability characteristics. This composite structure allows simultaneous achievement of greaseproofing, visibility, and controlled vapor transmission.
2Reliability
If the bag is sealed completely, then it maintains freshness, but water vapor accumulates causing sweating and fogging
Solution Approach 1:
The perforation structure creates controlled porous pathways through the bag material. These perforations allow water vapor to escape from the sealed bag interior, preventing condensation and fogging while maintaining the overall sealed structure for freshness. The perforations act as pressure relief and vapor escape channels without compromising the sealing integrity of the main bag structure.
3Loss of information
If a transparent film is applied to create a viewing window, then product visibility is improved, but the film may interfere with vapor escape
Solution Approach 1:
The transparent film is applied selectively to specific areas of the bag to create viewing windows, while leaving other areas (particularly areas with perforations) free of film coverage. This local application strategy ensures that the film provides visibility where needed without interfering with the vapor escape function of the perforation structure in critical areas.
Solution Approach 2:
The bag surface is segmented into different functional zones: areas with transparent film for visibility and areas with perforations for vapor escape. The perforation structure is divided into multiple individual perforations arranged in patterns, allowing some regions to be covered by film while others remain open for vapor transmission. This segmentation resolves the conflict between visibility and vapor escape.
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 solution enables the display of goods while preventing unwanted condensation, effectively maintaining crispiness and visibility for hot and greasy items, with the bag capable of withstanding high temperatures for extended periods.
Implementation Method 1
the perforation, whose function is not hindered by the partially transparent film, allows water vapor to escape from the interior of the block-bottom bag
Data Source
Figure 1a~1c
Figure 1d~1g
Figure 1h~1i
AI summary
Manufacturing method for a block bottom bag, wherein a sheet (2) is perforated along a longitudinal direction (3) in a first surface area (4), the sheet (2) is punched along the longitudinal direction (3) next to the first surface area (4) in a second surface area (5), the sheet (2) is provided with a transparent film (6) over part of its surface and overlapping the second surface area (5), so that a viewing window (7) is created in the second surface area (5), and the sheet (2) is processed into a block bottom bag (1) by folding and/or gluing.