High speed cutting assembly

Abstract

The present invention relates to a cutting assembly for use in a thin and ultra-thin web winding station, and to a method of cutting web using the cutting assembly. According to the invention, the strip (1) is cut by a blade (30) with a cutting edge transverse to the conveying direction of the strip, the blade being moved between a backward position and a forward position, in the forward position, The cutting edge is substantially parallel to the axis of the roll (7) for receiving the strip and the blade is substantially tangential to the surface of the roll. To cut the web, the blade is moved from its rearward position to its forward position at which the speed of the blade engaging the web is at least substantially equal to the speed of the web. This ensures a clean and clear cut on the strip. It also ensures that the leading edge of the strip sits smoothly and evenly on the roll without any creases or wrinkles.

Description

Invention field [0001] The present invention generally relates to cutting knives and methods, in particular to the field of cutting knives and methods for strips, the strips are especially plastic strips, such as polyester, polyethylene, PET (polyethylene terephthalate) ) Or PEN (polyethylene naphthalate) made of strips. Background of the invention [0002] The manufacture of thin strips made of plastic materials (such as polyester) requires different operations to be performed on the strips, such as stretching the strips, winding the strips on a reel, and so on. It is also necessary to cut the strip after, for example, a roll of fixed-size strip is wound. This creates multiple problems. The first problem is the effective cutting of the strip. The second problem relates to the front and back edges produced during the cutting of the bar. The third problem is to protect the core on which the strip is about to be wound, because the core has to be used multiple times. Ideally, a perf...

AI Technical Summary

Problems solved by technology

The first problem is efficient cutting of the strip

The second problem concerns the leading and trailing edges created during the cutting of the strip

The third problem is to protect the core on which the strip is about to be wound, since the core is used many times

[0009] In summary, none of the various solutions of the prior art can provide an ideal cutting device that should cut thin and ultra-thin strips at the winding station while ensuring: ① transverse A clean cut cut in the direction of the strip winding; ② smooth and steady placement of the leading edge of the strip on a new core roll without stopping the supply of strip to the station

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