Levelling during sicing
How to level in levelling during sicing longitudinal suture? If there is a typical coronal or thick center coil that is slit, the diameter of the center coil on the coiler will be larger than the diameter of the outer coil. This makes the central wind blow faster, while the outer wind blows slower and looser, with the apparent excess hanging down in a loop.
A few years ago, paper would be tucked into these loose outer edges so that they would have the diameter of a central cut, tightly wound in the process. Today, the American National Standards Institute (ANSI) B11.14 cutting safety standard, which applies equally to line owners and operators, prohibits filling paper unless the line is stopped or the operator is protected. Filling paper or cardboard is no longer necessary, as slitting technology has eliminated the need to do so.
Thirty years ago, friction drag was invented to apply tension to all the reels that went into the rewinding mandrel.
Apparently redundant strands on the outside, loose mults were allowed to sag into a circular pit between the slitting machine and the drag device. While this solves the differential rewinding problem, it also introduces new problems. In addition to having to dig, clean and walk around the pit, any dirt or grit on the friction drag device may scratch or imprint the coil surface.
In addition, the shape and straightness of the coil are no better than the main coil, and often worse. Leveling individual narrow mults after slitting is not mechanically or economically feasible.
Slits induced crossbows are another problem.
It won't happen in a perfect setup: the male and female release rings are exactly right, the slitters are sharp, the Settings are correct, and the slitters' bodies don't deflect. Of course, most Settings aren't perfect.
An imperfect scutter setting puts alternating up/down crossbows into each piece. The first cut pushes the male down into the female. The second cut pushes from the male to the female, then down, up, and so on. The result is that the edges of each blend alternate up and down. This is a key issue for stamping applications, roll-forming, and tube manufacturing, because the upper bow mults run on parts that are not exactly the same as the lower bow mults do.
Levelling assisted by the tension of each strand after cutting and before unwinding can help eliminate these problems. That's what the Strand ExtensionerTM, a patented slitting process developed by the author's company, does. This special open-seam configuration was originally designed to elongate a thicker central strand that would otherwise recoil faster and more tightly. When using this process, all lines can be tightly rewound without dangerous paper packing or friction resistance devices and ring pits. Most of these lines are on flat ground.
In this process, the line operator stands on the main control panel, away from the dangerous reel collet, and changes the elongation of the tight multi-reel machine by flipping the lever. Just as with a roll straightener, the operator can extend some parts of the coil relative to others by adjusting the backup roll quarrel to intentionally change the sink or permeate the upper and lower working rolls of the machine at different points.
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