Pneumatic Dispenser for Absorbent Granule Mass Control
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Solution Overview
Problem
Existing systems for applying absorbent polymer granules in disposable sanitary hygiene products face challenges in controlling the quantity and distribution of the material due to variability in granule density and size, leading to inefficiencies and increased complexity, particularly in high-velocity production lines.
Innovation Solution
A device that uses a continuous dispenser with a control system to maintain a constant mass flow of absorbent polymer granules, transforming it into discrete, weight- and size-controlled doses applied at a constant pitch on a moving substrate, utilizing a movable element and air flow to manage granule distribution and prevent contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a rotary dispensing cylinder with slots and recesses is used to apply absorbent polymer granules, then the material can be deposited in discontinuous quantities, but the control of the quantity applied is indirect and imprecise due to reliance on apparent density
Solution Approach 1:
The patent replaces the mechanical rotary dispensing cylinder system with a pneumatic system that uses air flow to convey and deposit absorbent polymer granules. This substitution eliminates the need for mechanical slots and recesses, providing direct control over material quantity through air flow parameters while reducing mechanical complexity
Solution Approach 2:
The patent changes the control parameter from apparent density (indirect control) to air flow rate and deposition time (direct control). By controlling the volume of air flow and the duration of deposition, the system achieves precise control over the quantity of absorbent material applied, independent of granule density variations
2Productivity
If the production line velocity is increased to improve productivity, then more products can be manufactured per unit time, but the control of granule distribution and prevention of contamination becomes more difficult
Solution Approach 1:
The patent uses pneumatic air flow to convey and deposit absorbent polymer granules at high production velocities. The air flow system can be precisely controlled to maintain accurate granule distribution and prevent contamination even at increased production rates, as the pneumatic system responds quickly to control signals
Solution Approach 2:
The patent incorporates a control system that monitors and adjusts air flow parameters in real-time to maintain precise control over granule deposition. This feedback mechanism ensures that even at high production velocities, the distribution and quantity of absorbent material remain consistent and contamination is prevented
3Quantity of substance
If the volume of slots and recesses on the dispensing roller is increased to apply more material, then the quantity of SAP deposited increases, but the variability in apparent density causes inconsistent weight control
Solution Approach 1:
The patent replaces the mechanical volume-based dispensing system with a pneumatic mass-flow control system. By controlling air flow rate and deposition time, the system achieves direct control over the mass of absorbent polymer deposited, eliminating the indirect control through apparent density that plagues volume-based systems
Solution Approach 2:
The patent changes the control approach from volume-based (slots and recesses) to mass-based control through air flow parameters. By measuring and controlling air flow rate and deposition duration, the system directly controls the mass of material deposited, making the process independent of apparent density variations
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
Ensures precise and consistent application of absorbent material, reducing waste and environmental impact while minimizing production costs by maintaining control over the weight and geometric parameters of the absorbent structure, even at high production rates.
Implementation Method 1
a continuous dispenser (30) providing a constant-mass flow (320) of material in granules (310) to a device (20) transforming the flow into a plurality of discrete quantities (250) of said material in granules (310) and applying said discrete quantities (250) at a constant pitch (P) on a moving substrate (50, 60)
Data Source
AI summary
A device for transforming a continuous and controlled flow of absorbent material in granules into an intermittent flow for providing the material to a receiving member movable along a direction X, including a feed manifold, an outlet and a main body, placed between the feed manifold and the outlet, configured to cause the absorbent material to flow along a direction (Y′-Y′) coinciding with the respective axes of symmetry of the feed manifold, the outlet nozzle and the main body; wherein within the main body a movable element is housed, capable of moving alternately between a first and a second working position, such that when the movable element is in the first position, it forms a first accumulation chamber of the material, and a first discharge duct of the material, and when the movable element is in the second position, it forms a second accumulation chamber and a second discharge duct.