Swings Proofer

Download brochure of a swings proofer Alitech for bakeries

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1. Structure

Construction process of the swings proofer Alitech

The proofers are made of stainless steel pipes. To make cleaning and maintenance operations easier all the proofers are provided with internal side corridors, on the ground and overhead, with access doors on both sides.

The conditioning unit is located on a platform, which is accessible by means of a stairway.

Completely insulated, insulation panel stands on the ground or, in case of “L” proofer, on the elevated platform.

This type of proofer normally has the classic box shape and in the middle is provided with a tunnel to cross it laterally.




2. Product conveying system

Chain driving system of the swings proofer Alitech for pretzel


The chain driving system which consists of a gear box under frequency inverter connected to a driving shaft with wheels which transmits the movement to the 2 sections of the chain on both sides of the proofer and at the same time. In case of big proofers the driving system can be split.

The chain, that gets motion from the driving system and moves the trays in the proofer. Oil free chains can be used to avoid contaminations: this has drastically improved the hygiene conditions inside the proofer. In the horizontal sections the chain runs on a PE guide.

The wheels around which the chain runs: they can be made of hardened steel or PE. The plate on which they are fixed is adjustable in order to center two chain’s sections. The wheels do not need lubrication.






Chain tensioning mechanism of the swings proofer Alitech

Compensating trolley of the swings proofer Alitech for soda bread

The chain tensioning plates: these are activated by pneumatic cylinders when the proofer is switched on; when the proofer is switched off, the pressure of the cylinders is released to take off the tension from of the chain. This results in a longer life time of the chain and system control. The correct tensioning is guaranteed by sensors, positioned on the cylinder’s rod: they detect when the chain has to be stretched.

The compensating trolley which moves vertically: this allows to keep discharge of the proofer moving while the infeed stands still, this way it is possible to create loading cycles keeping a constant discharge speed.

The product discharge roller also has a variable diameter in order to adapt it to the different heights of the product.




3. Product conveying support

Pretzels on the swings of Alitech industrial proofer for bakeries

The type of product conveying support consists of a cotton coated swing which holds the product.

The swing is made of stainless steel and is fixed on both sides to the chain through pins, in correspondence to the chain’s bearings.





4. Air conditioning, air distribution and insulation

Alitech supplies the conditioning unit with the air conveying and return system (ducting), designed to meet the requirements of the final product technology.

The conditioning unit is controlled by a PLC with indication of the set and actual parameters. Air distribution sleeves made of antibacterial inflatable fabric are used inside the proofer, they can be easily removed and washed.

The insulation of the proofer is made of sandwich type panels with both sides in stainless steel; the panels are self-carrying and arrive to the ground being slightly separated from the proofer frame to avoid dirt accumulation.

The DUO version of the swing proofer provides two zones with different temperature and two different conditioning units: the first part is for proofing with hot and humid air, the second one is for cooling. Between the two zones there is an intermediate one which separates them.

Internal corridor to access swings proofer Alitech

Air conditioning unit of the swings proofer Alitech

Insulation of the swings proofer Alitech for pretzel and soda bread


5. Maintenance, accessibility, hygiene

Although the different proofer types have different specifications what they have in common is the possibility of easy access to all the points inside the proofer that need maintenance or control.

The proofers are fitted with side corridors between the external panels and the frame, the corridors are under bottom and at the top part of the proofer, they are lighted by neon lamps and are served by access doors.

The product carriers that travel inside the proofer are also accessible and are kept high from the floor to facilitate cleaning operations. In case of chains with oil, the lubrication can be scheduled by means of a distribution pump. The bearings of the toothed wheels are lubrication-free.


6. Control

Control panel of the swings proofer Alitech

The operating system is designed like a graphic representation of the proofer with set-points, alarms and status of the different parameters. The information on the panel available to the operator and to the plant management is scalable to provide, for example, scheduled maintenance tables, productivity and energetic efficiency diagrams and coefficients.

Our aim is to present to the supervisor all the main parameters to manage and control the line at the same time reducing as much as possible the human presence on the machine side.