Rewinding Machine Moving Member Pinch Web Material
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Solution Overview
Problem
Existing paper converting machines face difficulties in fine-tuning the initial step of severing web material and starting the central nucleus winding process, especially due to variations in web material characteristics such as thickness and tensile strength, which affects the quality and efficiency of log production without a winding core or mandrel.
Innovation Solution
A rewinding machine design featuring a first winding roller and a concave plate with a moving member that pinches the web material to decelerate and sever it, forming an initial nucleus that then winds around itself and is transferred to a winding cradle, allowing for controlled winding without a core or mandrel, and optionally using suction or air jets for precise severing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If web material is pinched between a moving plate and winding roller to cause deceleration and tearing for starting the central nucleus winding, then the initial winding step can be performed without a winding core, but the process becomes difficult to fine tune due to variations in web material characteristics such as thickness and tensile strength
Solution Approach 1:
The invention employs a movable plate that can be positioned at different locations around the winding roller's circumference, allowing dynamic adjustment of the pinching point. This enables optimization of the deceleration zone position and duration based on varying web material properties, making the process adaptable to different thickness and tensile strength characteristics while maintaining ease of operation
Solution Approach 2:
The invention allows modification of critical parameters including the plate's position around the roller, the pinching force applied, and the duration of deceleration. By adjusting these parameters, the system can accommodate variations in web material characteristics without requiring complex fine-tuning procedures
2Speed
If a convex portion on the moving plate is used to pinch the web material against the winding roller, then substantial deceleration and tearing can be achieved, but the critical nature of the initial step increases and fine tuning becomes difficult
Solution Approach 1:
The movable plate can be dynamically positioned to create optimal deceleration zones, and its movement can be controlled to achieve precise tearing at the desired location. This dynamic control ensures both substantial deceleration for effective tearing and precise control over the nucleus formation process
Solution Approach 2:
The system incorporates feedback mechanisms to monitor the web material's response during pinching and deceleration, allowing real-time adjustments to maintain precision in the severing and nucleus formation steps while achieving the required deceleration
3Shape
If the moving plate has a concave portion to allow the initial winding nucleus to advance and increase in diameter, then the nucleus can be formed without a central hole, but the process becomes sensitive to web material variations
Solution Approach 1:
The concave portion's geometry parameters such as depth, width, and curvature radius can be adjusted to accommodate different web material properties. This ensures reliable nucleus formation without central holes across varying thickness and tensile strength characteristics of the web material
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 solution enables the production of high-quality logs without a core or mandrel, improving the initial winding step's precision and efficiency, and allows for flexible operation to produce conventional logs with cores or mandrels by adjusting the machine's configuration.
Implementation Method 1
The moving member is arranged and controlled to pinch the web material against the surface of the first winding roller and decelerate the web material between the moving member and the surface of the first winding roller
Implementation Method 2
The severing of the web material is performed by the moving member, optionally with the aid of a suction system or an air jet
Data Source
Figure 1
Figure 2~3A
Figure 4A~4B
AI summary
The machine comprises a first winding roller (3) and a concave plate (17) extending around the first winding roller (3). The first winding roller and the concave plate define a feed channel (19) of the web material (N). Upstream of the concave plate (17) there is arranged a moving member (21) comprising a pinching surface (23B) cooperating with the first winding roller (3) to pinch the web material (N) against the first winding roller (3). The moving member (21) is arranged and controlled to pinch the web material (N) against the surface of the first winding roller (3) and decelerate the web material between the moving member (21) and the surface of the first winding roller (3), causing a leading edge (LT) to wind around itself to form a winding nucleus of a log (L; L1).