Mineral Wool Pipe Shell Winding Density Control
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Solution Overview
Problem
Conventional methods for producing pipe shells with a bulk density gradient are inefficient, leading to oversizing in colder areas and high production costs due to the need for separate manufacturing and installation of inner and outer parts, and are not suitable for high-restoring-force mineral wool materials like glass wool.
Innovation Solution
A winding process where the rotational speed of the counter-roller is adjusted to increase at the beginning and decrease at the end, allowing for precise control of bulk density distribution within the pipe shell without modifying existing equipment, enabling a continuous production of pipe shells with a bulk density gradient from core to outer sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the rotational speed of the counter-roller is increased at the beginning of the winding process, then the bulk density in the core area is improved, but the bulk density in the outer area becomes too high
Solution Approach 1:
The patent applies dynamics by continuously varying the rotational speed of the counter-roller during the winding process. The counter-roller starts with a high rotational speed to compress the mineral wool fleece in the core area, achieving high bulk density where thermal insulation is most critical. As winding progresses and the radius increases, the rotational speed is progressively reduced to prevent excessive compression in outer areas. This dynamic speed adjustment resolves the contradiction by matching compression force to the actual insulation needs at different radial positions.
Solution Approach 2:
The patent changes the operational parameter (rotational speed) of the counter-roller throughout the winding process. By transitioning from a static speed regime to a dynamic one where speed decreases as a function of winding progress, the system achieves optimal bulk density distribution. The parameter change allows the same equipment to produce different compression levels at different locations, solving the material distribution contradiction without requiring separate manufacturing processes.
2Manufacturing precision
If separate inner and outer pipe shells are manufactured to achieve bulk density gradient, then the thermal insulation is improved, but the production complexity and installation costs increase
Solution Approach 1:
The patent merges the manufacturing of inner and outer pipe shell sections into a single continuous winding process. Instead of producing separate high-density inner shells and low-density outer shells on different devices, the invention uses one winding machine that dynamically adjusts the counter-roller speed during a single operation. This combining of operations achieves the bulk density gradient while simplifying production logistics, storage, and installation.
Solution Approach 2:
The winding machine is designed with multi-functionality, where the counter-roller serves different functions at different stages of the winding process. Initially, it acts as a high-speed compressor for the core area; later, it transitions to a lower-speed roller for outer areas. This universal equipment performs multiple compression tasks that would otherwise require specialized devices, reducing overall system complexity.
3Manufacturing precision
If the rotational speed of the core is significantly reduced during winding, then the homogeneous raw density distribution is improved, but the production time increases
Solution Approach 1:
The patent applies local quality by targeting compression specifically where it is most needed - in the core area adjacent to the heated pipeline. Rather than uniformly reducing core speed throughout the entire winding process (which would slow production), the counter-roller provides localized high-speed compression only during the initial winding phase. This selective approach achieves homogeneous density distribution in the critical inner region while maintaining faster overall production rates.
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
This method allows for precise control of bulk density distribution, reducing material usage and production costs while maintaining effective thermal insulation, achieving a 20% lower average bulk density with the same insulating capacity as conventional methods and reducing heat losses by 5-10%.
Implementation Method 1
the open-pored structure of mineral wool materials is used to achieve good thermal insulation through the air trapped in the porous material or to largely destroy the sound energy of the gases flowing through by reflecting and absorbing the sound waves
Implementation Method 2
the open-pored structure of mineral wool materials is used to achieve good thermal insulation through the air trapped in the porous material
Data Source
Figure 1~2
AI summary
The invention relates to a method for the production of a conduit shell made of mineral wool by means of a winding process, comprising the following steps: providing a mineral wool non-woven material (3) having an uncured binder, adding the mineral wool non-woven material (3) to a winding station (1) having a core (4) and at least one counter-roller (5, 6, 7), winding the mineral wool non-woven material (3) around the core (4), wherein the at least one counter-roller (5, 6, 7) is moved further away from the core (4) from an initial distance (XA) to a final distance within the course of the winding process, and wherein the at least one counter-roller (5, 6, 7) is driven at a higher rotational speed (?G) at the beginning of the winding process than at the end of the winding process. The invention further relates to conduit shells that are produced by means of said method. In this manner an improved method is provided for the production of a conduit shell made of mineral wool by a winding process, by means of which the green density gradient within the walls of the conduit shell can be adjusted in a particularly accurate manner with low process efforts.