Discharge Device for Nonwoven Fabric Density Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing devices for producing nonwovens on forming belts struggle to achieve precise and uniform material distribution, leading to over- or under-dispersion, and face challenges with material buildup and interference, which complicates regulation and affects the production of material panels with specific density profiles.
Innovation Solution
A device with adjustable openings in the discharge section, utilizing a cover plate and slides that can be moved by an actuator to control the opening size, combined with pneumatic cleaning and height-adjustable discharge devices, ensures optimal material distribution and prevents blockages, allowing for precise control of material flow and density profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed discharge openings are used in the discharge device, then the device structure is simple, but the adjustability for controlling material distribution and density profiles is insufficient
Solution Approach 1:
The discharge device incorporates movable slides with adjustable openings instead of fixed openings. The slides can be positioned at different locations along the forming belt width, allowing dynamic adjustment of material discharge locations and quantities. This enables adaptation to different density profile requirements while maintaining a relatively simple overall device structure.
Solution Approach 2:
The discharge device is divided into multiple independent discharge sections, each with its own adjustable slide and opening. This segmentation allows independent control of material discharge at different locations across the forming belt width, enabling precise control of density profiles without requiring complete redesign of the entire discharge system.
2Manufacturing precision
If material is discharged in large quantities at specific locations, then density profiles can be achieved, but material buildup occurs in front of discharge openings causing interference and control difficulties
Solution Approach 1:
Instead of discharging all required material at a single location, the system uses multiple discharge locations with partially distributed material flow. Each slide discharges a portion of the total required material, preventing excessive accumulation at any single point while still achieving the target density profile through cumulative effect.
Solution Approach 2:
The slides act as intermediaries between the material flow source and the forming belt. They control and regulate the material flow, distributing it gradually across different locations rather than allowing direct, uncontrolled discharge. This intermediary control prevents material buildup and interference while maintaining precise density profile control.
Data Source
Figure 1
Figure 2
AI summary
The present invention relates to a device for spreading a nonwoven fabric (11) onto a forming belt (12) circulating endlessly below the device (10), particularly in the course of manufacturing material sheets from free-flowing material (1) such as fibers or chips, wherein the device (10) comprises: - an upper inlet opening for feeding the material (1) and a lower outlet opening for discharging the material (1) onto the forming belt (12), - at least one distribution roller (14) and a spreading roller (15) transverse to the transport direction (13) of the forming belt (12), and - a discharge device (2) for section-by-section removal of material (1), wherein several size-adjustable openings (3) are arranged on the discharge device (2) transversely to the transport direction (13), which are operatively connected to a conveying device (21) for the material (1) passing through the openings (3) for separating material (1) from the device (10).The invention consists in particular in that a cover plate (4) and a plurality of slides (5) with an opening (6) are arranged in the discharge device (2), wherein the cover plate (4) partially covers the opening (6) in order to adjust the size of the opening (3) and the cover plate and/or the slides (5) are arranged to be displaceable by means of at least one actuator (17).