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Why use an inline cutter manifold system for trim waste?

This is the final post in series about how inline cutter systems (cutter/fan trim removal systems) efficiently convey, process and remove continuous edge trim and waste filament. Part 6 discussed air-trim separators. Part 7 explores manifold systems as used in trim removal systems.

Manifold trim removal systems are often used when trim or waste filaments are generated at multiple sources reasonably close to each other.

 

Conventional Manifold Systems

Conventional manifold systems usually use a venturi or a fan on the upstream side of the air-trim separator. These systems have, in addition to all the shortcomings of a single-source conventional system, a major problem with trim entanglement — resulting in blockage of the line, the air-trim separator and any rotary and other valves in the system, plus the overloading of any size reduction equipment into which the air-trim separator discharges.

Conventional Manifold System

The speed of the trim generated at each machine is the line or web speed of that machine. Usually, the speeds of the several machines using the manifold system will be different from each other. The trim waste from several machines, traveling together at different speeds in the common manifold, frequently entangle one with the other due to the turbulence in the pneumatic conveying line. The result is that the fastest trim builds up on the slowest trim and forms a ball of tangled trim waste in the line. The size of the ball generated depends on the relative speed of the trims involved, the length of the manifold and other physical factors.

Frequently, when the trim from a stopped machine tangles with the trim from an operating machine, the ball of tangled trim waste will build up to the size of the manifold and plug the line. The combination of the tangled trim ball size and the pressure drop across the ball often generates a force sufficient to break the stopped trim. The tangled trim ball then moves as a single mass at the conveying speed down the manifold into the air-trim separator, creating blockage problems in the separator, the discharge valve or the succeeding process equipment.

This entanglement problem is particularly acute when a bank of slitters are started and stopped with each roll change and are operated over their full speed range to match the slitting characteristics of the web being handled.

In the case of the entanglement of trim from a stopped slitter with that of a slitter operated at 2,000 feet/minute, the trim ball builds up at the operating slitter speed. In only 2 minutes of entanglement, 4,000 feet of trim waste will build up on the entanglement ball, a voluminous mass that can readily cause blockage problems.

Inline Cutter Manifold System

Inline Cutter Manifold System

An inline cutter is installed between the junction of the trim line from each machine and the manifold. This eliminates any negative interaction between the trims from various machines while capitalizing on the many other advantages of inline cutter system discussed previously in this series.

Contact us to find out if an inline cutter manifold system is right for your shop.


 

 

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