Bi-parting doors vs Rollup doors

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Why choose a Bi-Parting Door over a Rollup Door? Let's run through the differences...

This is a common question we get from people looking at purchasing a new high speed door, and it’s a very valid question. So what’s the answer?

Roll-up and Bi-Parting Doors are the two door types most commonly used in food processing, logistics and warehousing facilities due to their functional and hygienic characteristics. Both types of doors have a range of similar features and benefits; can be rust and dust-proof, not made of absorbent materials, easy to inspect and clean, can be knock out and self-repair, effectively sealed to prevent microbial hazards caused by condensation, and are able to withstand state harsh environments and cleaning acids… plus many more features and benefits. But few people can see the vital differences between bi-parting doors and rollup doors, especially for industrial facilities, so here we go:

VERTICAL ROLLUP DOORS

Vertical rollup high speed doors are single flexible panel doors that move only in the vertical plane. Vertical opening roll-up doors act very fast at a speed of about 2m/s (dependent on door type), and some are designed to survive impact with a forklift, which they do so very effectively and can re-feed themselves, at the same time causing less damage to the forklift and driver.

Maintenance and cleanliness is important on rapid (or not so rapid) rollup doors, because contaminants like bacteria and dirt can be picked up from the ground with the door’s bottom seal, then when the door is open it may drip down onto product or packaging passing underneath if the seal is not cleaned and is not well maintained.

This causes major health concerns for food processing areas, as food may be silently contaminated without no one knowing.

On facilities where forklifts are significantly tall for reaching high racking, no matter how fast the rapid rise door may be, the forklift driver still has to pause until the door opens enough to allow the full height of the forklift to pass through, and it also increases the chance for more door impacts as forklift drivers get impatient. In this case, a bi-parting door could be more efficient.

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SO WHICH SHALL I CHOOSE?

Obviously we’ve swung you to thinking the bi-parting door is a better option…. but this totally depends on the situation. So what to do? Speak to us, we’ll help you decide! Each application is unique, and bi-parting doors tend to be more expensive as well, so we’ll help you weigh up the options. Just give us a call on 0800 807 753 or email us on support@ultigroup.co.nz and we’ll help you out.

 

 

BI-PARTING DOORS

Bi-parting doors on the other hand consist of a pair of door panels on a doorway that part in the middle and away from each other to separate and open. It can be surface mounted on the wall or installed in pockets in the walls (surface mounted is preferred for ease of servicing and maintenance of the door panels and equipment).

Let’s talk about the speed advantage.

Picture this; a bi-parting door has two panels. Each moves at the speed of a vertical rollup door, but instead of opening upward, it opens sideways – so for starters, its already twice as fast as a rollup door.

Secondly, imagine a high mast forklift going through a doorway. If it goes through a bi-parting door, the two panels only have to open the width of the forklift, which is usually only 1.7m, so each panel only has to move about 90cm for the forklift to be able to move through the door.

Now if this was a rollup door, the panel has to rise the full height of the forklift mast, which can be up to 5m high! So all in all you can save up to 5 seconds each time you go through the door, by using a bi-parting door.

The other factor is that using a bi-parting door means there is no chance of bacterial being carried from the floor and above the product, and potentially dropping and contaminating it.

So it’s all sounding like a no brainer…why would we ever install a rollup door again? Well one issue is that they aren’t as impact friendly as some rollup doors, as yes you can impact them from one side, the panels will just swing out, but when you impact them from the side from which they are mounted, they have nowhere to go and can bend and flex out of shape. But you’ve got to remember the chance of impact is lessened due to faster opening times.