Product category:
Packaging, Conveyors and Materials Transfer
News Release from: Baldor UK | Subject: Five-axis motion control system
Edited by the Processingtalk Editorial
Team on 29 May 2003
New machinery for making re-sealable
pouches
Multi-tasking motion control system accelerates throughput of zipped food pouches - linear motor technology delivers continuous-process speed for 'cross web' zip application
An advanced five-axis motion control system from Baldor is at the heart of the first continuous 'cross-web' zipper applicator for continuous vertical form-fill-seal and horizontal flow-wrapping equipment The new machinery for manufacturing re-sealable pouches - developed by Line Equipment for inserting Supreme Plastics narrow zippers - is expected to achieve throughputs of over 80 pouches/minute, providing a breakthrough in food packaging technology
This article was originally published on Processingtalk on 26 Mar 2003 at 8.00am (UK)
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By applying zippers across the web, food producers gain considerable packaging flexibility compared with conventional in-line zip application techniques - boosting fill ratios, saving material, and allowing one machine to be programmed for form-fill-seal operations on a much wider spectrum of pouch sizes.
To achieve continuous manufacturing, the innovative Line Equipment machine uses three zip applicators mounted on looped belts, each driven by a rotary servomotor.
The applicators work in a sequence: while one is applying a zip - accelerating to web speed and synchronising with a registration mark - the next is having a zip loaded, and the third moving into the start position.
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A fourth rotary motion control axis feeds and cuts zip lengths into the applicators as they reach the loading point in the loop.
A fifth axis, located under the plastic web material, controls the movement of a heating element that synchronises with the plastic web and applicator and seals the zippers into place.
This axis uses a linear motor, because of the sheer accelerations required to track the zipper applicator - before applying heat - and then return to the start position in readiness for the next applicator.
At 80 pouches/minute, this axis can be accelerating at rates in excess of around 2.4 G, or 23 metres/sec/sec.
The motion control system uses a panel-mounting Baldor NextMove BX motion controller to manage the zipper applicator and linear motor axes, plus a standalone intelligent Flex+Drive to control the zip feed and cut axis.
The two motion control subsystem elements link to a Baldor operator panel using a CANopen fieldbus, which allows the operator to define zip length, pouch size, etc Both units include the I/O required for the various sensing and actuation functions associated with the process, such as registration mark detection and zipper knife control.
Baldor provides all motion, I/O and human-machine interface system components required for the new machine, and wrote the application software using the popular MintMT motion language.
Development time was greatly reduced by means of the MintMT built-in multi-tasking operating system.
Baldor used this feature to divide the major control functions of the machine - controlling the belt and linear motor axes, and the man-machine interface - into separate tasks.
This greatly simplified software development, allowing the control program to be written in a couple of days, ready for download onto the prototype.
With testing, the application software was produced within a week, helping to keep the Line Equipment development project on target.
The availability of application-level software in the form of 'keywords' within the Mint language also contributed significantly to fast software creation.
In particular, Baldor used FLY, a high level command which will synchronise the movement of two axes while controlling the position of one - providing an elegant solution for the continuous zip attachment process.
This synchronizes with the encoder on the web, so that the applicator automatically tracks the speed of the material, but it does so via a 'virtual axis' - a facility in Mint that allows the machine to be set up without the master axis running - saving material. Request a free brochure from Baldor UK ...
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