Elastomeric Sheet Infeed Stretching to Reduce Strip-Conversion Blockages
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Solution Overview
Problem
Existing apparatuses for converting sheets into continuous strips face issues with downtime due to blockages caused by irregularities such as folds or creases in elastomeric materials, requiring manual intervention for unclogging.
Innovation Solution
The apparatus employs a stretching mode with different infeed rates between infeed members to smooth out irregularities, using calendering rolls and guide bodies to flatten and guide the sheet, and incorporates an irregularity sensor to detect and prevent potential blockages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sheet is fed through the apparatus at a constant speed, then the feeding process is simple and stable, but folds or creases in the sheet may block or clog the apparatus causing downtime
Solution Approach 1:
The infeed section employs two infeed members with different infeed rates that can be dynamically adjusted. The first infeed member feeds the sheet at a first infeed rate while the second infeed member feeds at a second infeed rate, creating a stretching effect that reduces folds and creases. This dynamic speed differentiation allows the system to adapt to material irregularities and prevent blockages.
Solution Approach 2:
The patent changes the speed parameter of the infeed members to resolve the contradiction. By operating in a stretching mode where the second infeed rate is higher than the first infeed rate, the sheet is stretched between the two infeed members, which reduces irregularities such as folds or creases that would otherwise cause blockages.
2Reliability
If the second infeed rate is higher than the first infeed rate to stretch the sheet, then folds and creases are reduced, but the infeed section becomes more complex
Solution Approach 1:
The system implements dynamic speed control where the two infeed members can operate at different rates. This allows the apparatus to switch between stretching mode (second infeed rate > first infeed rate) for reducing irregularities and normal mode (equal rates) for standard operation, making the complexity manageable through conditional operation.
Solution Approach 2:
By changing the speed parameter relationship between the two infeed members, the system achieves sheet stretching to reduce folds and creases. The parameter change is controlled and reversible, allowing the apparatus to maintain reliability while managing structural complexity through controlled parameter variation.
3Ease of operation
If manual intervention is required to remove clogging, then the apparatus can handle blocked material, but downtime increases
Solution Approach 1:
The infeed section performs preliminary action by stretching the sheet between the two infeed members with different rates, which reduces folds and creases before the material enters the cutting section. This preventive measure eliminates the need for subsequent manual intervention to remove clogs, thereby reducing downtime while maintaining ease of operation.
Solution Approach 2:
The stretching process in the infeed section prepares the sheet in advance by reducing irregularities such as folds and creases. This preliminary action prevents blockages from forming in the cutting section, eliminating the need for manual unclogging operations and reducing overall downtime.
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
Reduces the risk of blockages and clogging, minimizing downtime by effectively handling irregularities in elastomeric sheets, ensuring continuous operation.
Implementation Method 1
By providing a speed difference between the first infeed rate and the second infeed rate, the sheet can be stretched between the first infeed member and the second infeed member. The stretching can reduce, flatten or smooth out irregularities, such as folds or creases, in the sheet.
Data Source
AI summary
Disclosed are an apparatus and a method for converting a sheet of elastomeric material into a continuous strip, wherein the apparatus includes a cutting section for providing a sequence of cuts in the sheet along which the sheet is separable into interconnected zig-zag sections to form the continuous strip, wherein the apparatus further includes an infeed section for feeding the sheet to the cutting section in a feeding direction along a feeding path, wherein the infeed section includes a first infeed member for feeding the sheet along the feeding path at a first infeed rate, and a second infeed member downstream of the first infeed member for feeding the sheet along the feeding path at a second infeed rate, wherein the apparatus is operable in a stretching mode in which the second infeed rate is higher than the first infeed rate.