Folded Paper Bag Assembly with Self-Locking Bottom Reinforcement
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Solution Overview
Problem
Conventional paper bags require gluing to assemble, which is costly, time-consuming, and prone to failures, leading to production inefficiencies and product fragility, especially at the bottom, making them unsuitable for small-scale production.
Innovation Solution
A creased paper sheet is used to form a bag without glue, assembled in a vertical U-configuration with integral bottom and sides, using handles and orifices for closure, and reinforced with triangular structures for enhanced strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gluing is used to assemble paper bags, then the bag body and bottom can be formed, but the production cost increases, production time increases, and the bag becomes fragile
Solution Approach 1:
The invention extracts and eliminates the gluing operation from the bag assembly process. By removing the adhesive component entirely, the patent achieves glueless assembly through self-locking geometric structures, thereby reducing production costs, eliminating glue cure time, and avoiding the fragility associated with glued joints while maintaining structural integrity
Solution Approach 2:
The paper sheet is divided into distinct functional zones (body portions, bottom portions, side portions) with specific fold lines and cut lines that create self-locking mechanisms. Each segment is designed to interlock with others through geometric engagement rather than adhesive bonding, allowing the bag to assemble without glue while maintaining strength
2Ease of manufacture
If gluing is used to assemble paper bags, then the bag can be formed, but the production time increases due to glue cure time
Solution Approach 1:
The gluing step and its associated cure time are completely extracted from the manufacturing process. The self-locking geometric design allows immediate assembly without waiting for adhesive to set, eliminating the time delay inherent in conventional glued bag production
Solution Approach 2:
The paper sheet is pre-creased and pre-cut with specific fold lines and cut lines that enable self-locking assembly. This preliminary preparation of the flat sheet allows the bag to be quickly assembled by simple folding and interlocking actions without requiring time-consuming adhesive application and curing
3Ease of manufacture
If gluing is used to assemble paper bags, then the bag can be formed, but equipment cost and production space requirements increase
Solution Approach 1:
The invention extracts and eliminates the need for gluing equipment, adhesive storage systems, and associated production line machinery. The glueless self-locking design can be assembled with simple folding mechanisms, dramatically reducing equipment investment and production space requirements
Solution Approach 2:
The bag structure is designed to assemble itself through self-locking geometric mechanisms without requiring external gluing equipment or complex assembly machinery. The interlocking folds and cuts enable the bag to form its own structure through simple mechanical actions
4Ease of manufacture
If gluing is used to assemble paper bags, then the bag can be formed, but the bottom becomes the most fragile spot
Solution Approach 1:
By removing the gluing process, the invention eliminates the creation of fragile glued joints at the bottom. The self-locking geometric design distributes structural stress through multiple interlocking folds rather than concentrating it at adhesive bonds, making the bottom as strong as or stronger than the rest of the bag
Solution Approach 2:
The bottom portions are merged with the body and side portions through continuous folded paper structures rather than separate glued components. This integration creates a unified load-bearing structure where the bottom benefits from the same structural reinforcement as the rest of the bag
Data Source
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AI summary
The present invention belongs to the technological sector of paper bags and packages and refers to a bag which can be assembled without the use of any adhesive, made up of a paper sheet (1) which forms the guide for the assembly of said bag, creased for folding and provided with openings (2) cuts, for introduction of handles (8) that promote the locking of the structure; provided with extreme longitudinal lines (3), that form the waist (4) of the bag mouth and that enables the introduction of a reinforcement (5); extreme cross-section lines (6), which define the area which will form the bag sides; central longitudinal lines (9), which define the region which will form the bag bottom and show triangular regions (12), which upon being folded increase the bag structural stiffness; the invention encompassing further the related assembly process.