Bag Melter Ring Constriction Sealing
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Solution Overview
Problem
Existing bag melting devices face contamination and incomplete material extraction due to bulging undersized packaging bags, leading to adhesive residue on the inner cylinder wall and environmental hazards from non-recyclable waste.
Innovation Solution
A bag melter design featuring a ring-like constriction at the outlet end with a conical sealing surface for self-centering the bag, a squeezing piston with a smaller head plate for complete extraction, and compression springs for safe operation, along with a scraper plate for cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If packaging bags are filled to full capacity, then material utilization is improved, but the bag cannot be pressed tightly against the inner cylinder wall in the heating zone
Solution Approach 1:
A sealing ring is introduced as an intermediary component between the packaging bag and the inner cylinder wall. The sealing ring has a sealing bead that contacts the bag's edge zone, providing the necessary sealing function without requiring the bag to be tightly pressed against the cylinder wall, thus resolving the contradiction between full filling and sealing reliability
Solution Approach 2:
The sealing function is segmented from the cylinder wall and assigned to a separate sealing ring component. This allows the sealing mechanism to be independent of the bag's fit against the wall, enabling full filling while maintaining reliable sealing through the dedicated sealing ring structure
2Productivity
If a squeezing piston with large cross section is used, then complete emptying of the bag is improved, but the piston cannot penetrate into the constricted area at the outlet end
Solution Approach 1:
The squeezing piston is designed with a dynamic cross-sectional area that changes along its length. The head plate has a smaller cross section than the main piston body, allowing it to penetrate the constricted outlet area first, after which the larger cross section engages to provide complete emptying force
Solution Approach 2:
The piston design transitions from a uniform cross-section to a variable cross-section along the axial dimension. The head plate's reduced cross-section enables passage through the constricted outlet zone, while the main body's larger cross-section provides sufficient squeezing force for complete emptying
3Reliability
If packaging bags are allowed to wrinkle for sealing, then sealing is improved, but complete emptying is prevented and material is lost
Solution Approach 1:
The sealing ring acts as an intermediary that provides sealing through its sealing bead contacting the bag edge, eliminating the need for wrinkles. This allows the bag to be fully filled without wrinkles while maintaining effective sealing, thereby preventing material loss in folds
Solution Approach 2:
The sealing mechanism changes from relying on geometric deformation (wrinkles) to relying on a dedicated sealing component (sealing bead). This parameter change in the sealing approach allows full filling without wrinkles while maintaining sealing effectiveness
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
Enables thorough emptying of packaging bags without frequent cleaning and reduces environmental impact by preventing adhesive residue and enabling recycling.
Implementation Method 1
at least one heating element is provided in the area of the at least one outlet opening of the receiving space and is used to melt the working material at the front end of the packaging bag
Implementation Method 2
compression springs are provided between a squeezing piston and a scraper or stripper plate, the scraper or stripper plate is extended in a depressurized rest state
Data Source
Figure 1~2
Figure 3A~3B
Figure 4A~4B
AI summary
The invention relates to a device for successively melting a solid working material, such as a hot melt adhesive (16), packed in a packaging bag (18), and for pressing the molten working material out of the packaging bag, comprising a cylindrical receiving chamber (12) provided with at least one outlet opening (14A) at the end for receiving the packaging bag (18) filled with the working material and having a front end (18b) and a back end (18A). The invention further comprises at least one heating element (30) in the region of the at least one outlet opening (14A) for melting the working material at the front-end of the packaging bag (18) having a discharge opening (18C) for the molten working material, and further comprises a pressing device (20) with a pressing plunger (22) that can be displaced within the receiving chamber (12) and acts on the back end (18A) of the packaging bag (18). The device is protected from contaminations by molten working material when used with undersized packaging bags that are extremely filled in that the receiving chamber (12) at the outlet end (12D) thereof facing the at least one outlet opening (14A) comprises a ring-like constriction (40) with a peripherally sealing contact surface (40A) for the packaging bag (18) at least at the edge zone (18D) thereof surrounding the discharge opening (18C).