Bowl-Shaped Polyurethane Substrate for Continuous Reactive Mixture Coating
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Solution Overview
Problem
Existing methods for continuous production of polyurethane reactive plastic materials face challenges in ensuring uniform distribution and preventing air bubbles and leakage of the reactive mixture during application, which affects production efficiency and device longevity.
Innovation Solution
The method involves guiding a sheet section with a concave and flat section, folding lateral sheet sections to form a bowl-shaped structure for receiving the reactive mixture, ensuring sealed connection to prevent leakage, and using a revolving band for continuous movement, with optional vacuum support for precise handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the reactive mixture is discharged into the environmental atmosphere, then the production process can proceed continuously, but stationary device components get polluted with reactive mixture reducing device reliability
Solution Approach 1:
The substrate is divided into a first sheet section and two lateral sheet sections that are connected to form a bowl-shaped structure. This segmentation creates a contained application area that prevents the reactive mixture from contacting stationary device components while maintaining continuous production capability.
Solution Approach 2:
The lateral sheet sections act as an intermediary barrier between the reactive mixture and the environmental atmosphere. By forming sealed side walls, they prevent the reactive mixture from leaking onto stationary components while allowing the continuous discharge process to proceed.
2Ease of manufacture
If air bubbles are introduced into the reactive mixture, then the application process becomes simpler, but the quality of the reactive mixture distribution deteriorates
Solution Approach 1:
The bowl-shaped structure formed by the first and lateral sheet sections creates a curved, contained application area. This curvature helps guide the reactive mixture flow smoothly and prevents air bubble formation, ensuring uniform distribution across the substrate width while maintaining a relatively simple application process.
3Device complexity
If the reactive mixture is applied without sealed containment, then the application technique is simpler, but air bubbles are introduced and distribution uniformity is compromised
Solution Approach 1:
The lateral sheet sections form flexible side walls that create a sealed bowl-shaped containment structure. This flexible sealing approach prevents air bubble introduction and ensures uniform reactive mixture distribution without requiring complex rigid containment structures, thus maintaining relatively simple application technique.
4Productivity
If the substrate is moved at higher speeds, then productivity increases, but the homogeneous distribution of reactive mixture along production width becomes difficult to maintain
Solution Approach 1:
The bowl-shaped structure formed by the connected sheet sections pre-establishes a contained application area before the reactive mixture is discharged. This preliminary containment structure ensures that the reactive mixture is properly distributed and sealed along the production width before the substrate moves forward, maintaining homogeneous distribution even at higher production speeds.
Data Source
AI summary
A method for continuous production of an endless string of polyurethane reactive plastic material including, a) conveying the reactive components to a mixer in a metered manner, b) mixing the reactive components into a reactive mixture, c) subsequently discharging the reactive mixture and d) coating a first sheet section made from a plane, flexible material which is conveyed continuously in a transporting direction with the reactive mixture. Further including: e) guiding the first sheet section across a guiding element, which has a concave section and a flat section which follows the concave section in the transporting direction; f) feeding two lateral sheet sections to the first sheet section, wherein the feeding occurs into the two lateral end sections of the first sheet section; g) merging the two lateral sheet sections and the first sheet section so that a bowl-shaped structure is formed for reception of the reactive mixture.