Rectangular-Bottomed Packaging Bag Gusset Formation Method
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Solution Overview
Problem
Existing methods for manufacturing rectangular-bottomed packaging bags lack clarity in holding the bag during formation and may deteriorate productivity due to issues with sealing the bottom gusset, leading to potential opening of the gusset and reduced efficiency in the manufacturing process.
Innovation Solution
A method involving an unfolding step where the flat bag is opened from the inside to form a rectangular cross-section, followed by a gusset forming step where side and bottom gussets are formed while holding the side gusset in place, using opening/closing plates to facilitate the formation of the gussets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the bottom gusset is sealed by integrating four portions of the film using a heat sealer, then the sealing strength is improved, but the bottom gusset cannot open and productivity deteriorates
Solution Approach 1:
The bottom gusset is formed in advance during the flat bag manufacturing process, but the sealing is designed to allow opening. The four portions (both end edges of bag front surface portion, both end edges of bag rear surface portion, and both end edges of bottom gusset) are integrated by heat sealer to create the bottom gusset structure, but the sealing method enables the gusset to open when needed, preventing productivity deterioration
2Manufacturing precision
If folding plates are thrust into the bag to form gussets, then the gusset formation is improved, but the holding form of the bag is unclear and manufacturing reliability deteriorates
Solution Approach 1:
Opening/closing plates are introduced as intermediary devices to hold the flat bag during the gusset formation process. These plates provide a clear and reliable holding form, enabling the folding plates to effectively form the gussets while maintaining manufacturing reliability through proper bag positioning and support
Data Source
AI summary
A method for manufacturing a rectangular-bottomed packaging bag includes an unfolding step of unfolding a flat bag by separating a pair of opening/closing plates (13) inserted into the flat bag from each other in a thickness direction of the flat bag, and a gusset forming step, after the unfolding step, of forming a side gusset and a bottom gusset by thrusting folding plates (11 and 12) between the pair of opening/closing plates (13) from the outside of the bag toward the inside of the bag.