COMMON SPIRAL TERMINOLOGY
The main carrying belt that is used on a spiral, can be metal, plastic or a combination. This is the belt which comes into direct contact with the product in the spiral.
Typically made in a plastic material, these sprockets directly engage the belt and are located near the take up drive.
Elongation of the belt due to physical wearing, not to be confused with thermal elongation.
The force that can be measured on the outer edge of the belt, which is a function of the overdrive on the cage. When this tension gets to high, the outer edge of the belt wants to lift upward, causing potential problems.
The central part of the spiral which is used to supply the force that drives the belt, sometimes referred to as the drum or center cage.
A varying factor applied to the belts being used in a spiral. This collapse factor affects belt lengths in a system, as well as being affected by varying cage diameters.
The point where the belt enters the cage and changes state from straight to radius.
Sometimes known as tiers, this is the belt surface area where the product rides. Can also be referred to as a surrounding platform which is used for sanitation or air flow purposes.
The point where the product leaves the spiral.
The chain that is used to turn and drive the central cage or drum.
Dimensional number that should not be exceeded for proper clearances.
Term applied to a method of continuous turning the belt over as it travels through the spiral system. Usually associated with equalizing wear on both edges of the belt.
Term applied to the cage speed differential as compared to the belt speed, as measured on the inside edge of the belt. In all cases the cage must travel faster than the belt.
When there is to much take up drive force being applied, a belt over tension occurs, decreasing belt life and possibly causing belts to flip upward on the outer edges.
Any point of contact area where proper clearance is not met.
Modular plastic belting with various types and styles having specific application performance.
The maximum distance between the top surface of the belt and the closest support structure on the next deck or tier.
Various precautions used throughout spiral systems which include sensors and switches to assist in plant safety.
Any point of contact area which can cause product shearing.
Pulleys or strips, usually made from plastic, which help guide the belt near the infeed and discharge pulleys.
Attached to the main drive motor, this unit allows for selected belt speeds to be had.
Used throughout spirals for reverse bends of the belt, or to help guide the belt in selected areas.
The area where excess belt is gathered and controlled automatically.
A secondary drive to the main cage drive, this drive acts in conjunction with the main drive to govern the tension on the belt.
A force which is measurable either on the outer edges of the spiral belt, or on the main drive chain.
The distance from one belt level to the next, also know as tier spacing.
A device which is typically used on the take up drive to act as a safety slip in case of jam's in the system.
Horizontal carrying supports where the belt rides on.
Usually plastic materials placed on top of the track, for decreased friction on the system.
A state where there is too little drive force being applied to the cage/belt interface causing uneven belt surging.
A spiral where the product is fed at the bottom and exits at the top.
Structural supports which run vertically near the inside edge of the belt (the outside diameter of the cage), normally a material which has enough effective force to drive the edge of the belt properly.
Typically plastic wear strips which are attached to the vertical supports to interface with the inside belt edges.