Introduction
In metal stamping, Recoiling refers to the process of winding the processed continuous strip back into a coil. While there are specialized rewinders for terminal strips, in most cases, the equipment used is the standard Recoiler Machine (which is often the same machine used for uncoiling).
However, using a Recoiler Machine for rewinding is different from uncoiling. The key lies in understanding the process flow and whether you are collecting scrap (waste) or finished products.
1. The Difference: Uncoiling vs. Recoiling
Although the machine looks the same, the application logic is reversed:
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When used for Uncoiling: The coil is loaded onto the contracted mandrel, expanded, and tightened manually. The motor then drives the mandrel to release material, controlled by a sensor loop.
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When used for Recoiling: The processed strip comes out of the stamping press and is fed towards the machine. It is then wound onto the mandrel of the Recoiler Machine, effectively turning the strip back into a coil.
2. The Critical Factor: Tension Control
During the rewinding process, winding tension often fluctuates. If you rely solely on the material’s own elasticity, the coil may become loose, lack toughness, or slide sideways. Therefore, the setup depends entirely on what you are rewinding:
Scenario A: Rewinding Scrap (Waste Material)
If the purpose is simply to collect waste strips for disposal:
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Requirement: Aesthetic appearance, tightness, and perfect layering are not critical.
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Solution: You can use the standard Recoiler Machine directly without additional accessories.
Scenario B: Rewinding Finished Products
If the recoiled material is a finished product intended for packaging or subsequent processing:
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Requirement: The coil must be tight, neat, aesthetically pleasing, and stable.
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Solution: You must install a Tension Unit (Tension Stand) before the Recoiler Machine.
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Why? The Tension Unit provides constant back-tension to the strip as it enters the rewinder. This ensures the coil is wound tightly and evenly, guaranteeing the quality of the finished roll.
3. Operational Steps
Whether you use a Tension Unit or not, the basic operation of the Recoiler Machine remains simple:
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Hook the Material: Place the head of the strip onto the support tiles of the expansion mandrel.
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Adjust Width: Adjust the A-Keepers (A-Iron) on the mandrel to match the width of the strip, ensuring alignment.
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Initial Winding: Use the “Inching” (Jog) button on the electrical control box to rotate the machine slowly. Wind the strip for about 5-6 turns to secure it.
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Start Production: Once secured, start the stamping press and switch the Recoiler to automatic mode for continuous production.
FAQ about Recoiler Machines
Q1: Can I use the same machine for both uncoiling and recoiling?
A: Yes. A standard heavy-duty uncoiler can often serve as a Recoiler Machine. The main difference is the direction of operation and the potential need for a tensioning device when rewinding.
Q2: Why is my recoiled coil loose and uneven?
A: This usually happens when rewinding finished products without proper tension. To fix this, you should add a Tension Unit to provide consistent back-force, ensuring a tight and neat coil.
Q3: Do I need a Tension Unit for scrap rewinding?
A: Generally, no. Since scrap material does not require high winding quality or neatness, a standard Recoiler Machine is sufficient.
Q4: How do I secure the material to the drum?
A: Simply hook the material head onto the mandrel tiles (or into the gripper slot if equipped), adjust the A-Keepers for width, and use the “Inch/Jog” mode to wind the first few layers manually.
