Graphite Tape Supply Apparatus Active Tension Control
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Solution Overview
Problem
Existing composite tape laminating machines are limited to using narrow, level-wound tapes due to inertia issues with larger reels, restricting lamination rates and requiring multiple passes for large-area applications, leading to higher material costs and reduced efficiency.
Innovation Solution
A graphite composite tape supply and backing paper take-up apparatus with actively controlled rotation and dancer movement, enabling the use of larger, single-wound reels with wider tapes, maintaining constant tension during lamination and cutting processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If larger, single-wound reels with wider tapes are used, then lamination rate and productivity are improved, but reel inertia increases making control difficult
Solution Approach 1:
The system dynamically adjusts braking force applied to the supply reel and take-up reel based on real-time conditions. The brake force is modulated to control the rotational acceleration and deceleration of large-inertia reels, enabling precise tension control during tape feeding and retrieval operations.
Solution Approach 2:
The system employs feedback control through dancer rollers that continuously monitor tape tension and reel position. This feedback is used to adjust brake forces on the reels, maintaining constant tension despite the high inertia of large reels. The active control system responds to dancer position changes to modulate braking forces accordingly.
2Area of stationary object
If tape width is increased beyond 0.5 inch, then lamination coverage per pass is improved, but level-winding control becomes difficult due to increased inertia
Solution Approach 1:
The level-winding mechanism uses dynamic brake control to manage the rotational inertia of wide-tape reels. By actively modulating brake force during reel acceleration and deceleration, the system maintains precise control over wide tapes (up to 2 inches or more) during the level-winding process, preventing tape distortion and maintaining winding quality.
3Ease of operation
If multiple narrow tape strips are used instead of wider tapes, then control is easier, but the number of passes required increases reducing productivity
Solution Approach 1:
The active control system with dynamically adjusted braking forces enables reliable handling of wide tapes by compensating for their higher inertia. This allows the use of fewer, wider tape strips (e.g., 2-inch wide tapes) instead of multiple narrow strips, reducing the number of passes required while maintaining ease of control through real-time brake force modulation.
Data Source
AI summary
An apparatus for supplying one or more strands of a relatively wide tape to a high-speed graphite tape laminating machine may include a tape supply reel and a backing paper take-up reel rotatably mounted on the machine, a dancer roller mounted on the machine for lateral movement thereon, and a mechanism for actively controlling the rotation of the tape supply and backing paper take-up reels and the lateral movement of the dancer roller relative to the support frame such that the respective tensions in the tapes are maintained substantially constant during both an on-the-fly tape add operation and an on-the-fly tape cut operation of the laminating machine.