Forming Collar Cutouts for Thick Packaging Material Conveyance
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Solution Overview
Problem
Bag-making packaging machines face issues with the smooth conveyance and damage of packaging materials with thick-layered portions, particularly at the folded-back portion of the forming collar, where abrupt direction changes occur, leading to potential damage to hem seal regions or heat seals.
Innovation Solution
The formation of cutouts on the folded-back portion of the forming collar allows thick-layered portions of the packaging material to pass through easily, reducing friction and preventing damage by creating a gap that accommodates the thick layers, thereby ensuring smooth wrapping around the cylindrical part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the packaging material has a thick-layered portion (hem seal region or overlapping region), then the sealing strength is improved, but the smooth conveyance of the packaging material is impeded and damage risk increases
Solution Approach 1:
The forming collar is divided into multiple sections including a first section, second section, and third section along the conveyance direction. The first section has a larger diameter than the second section, creating a stepped structure that accommodates the thick-layered portion during conveyance, preventing damage while maintaining sealing strength.
Solution Approach 2:
Different sections of the forming collar are designed with different diameters to match the local thickness requirements of the packaging material. The first section with larger diameter specifically accommodates the thick hem seal region, while other sections maintain standard diameter for normal operation.
2Strength
If the packaging material has a thick-layered portion (tape overlapping region), then the structural reinforcement is improved, but the conveyance smoothness deteriorates and heat seal damage risk increases
Solution Approach 1:
The forming collar is segmented into sections with varying diameters. The first section's larger diameter creates additional space that accommodates the thick-layered portion where tape overlaps, allowing smooth conveyance through the abrupt direction change without damaging the heat seal.
Solution Approach 2:
The stepped structure of the forming collar provides preemptive accommodation for the thick-layered portion before it encounters the abrupt direction change. This prevents friction-induced damage to the heat seal by cushioning the transition in advance.
Data Source
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AI summary
A bag-making packaging machine has a cylindrical part and a forming collar. The forming collar guides a sheet-shaped packaging material so that the packaging material wraps around the cylindrical part. The forming collar has a folded-back portion for changing a direction in which the packaging material advances to an approximately perpendicular direction. A cutout through which the thick-layered portion of the packaging material passes is formed in the folded-back portion. This reduces the amount of friction applied to the thick-layered portion when the packaging material passes by the folded-back portion of the forming collar.