5.2.4 Roller Table Chain (ST, RT)
Free flow: Bottling, canning
Roller Table Chain lets you convey and accumulate groups of small, separate objects, such as bottles, boxes, or cans. With Roller Table Chain, pallets are usually not used; the conveyed materials are placed directly on engineered plastic rollers. (See Figure 5.14.)
Construction and Features
Roller Table Chain is constructed from two strands of chains, which are connected with stay-pins and engineered plastic rollers that rotate freely. Conveyed objects are placed directly on the engineered plastic rollers. Conveyed goods are accumulated on the Roller Table Chain with low friction.
Figure 5.14 Roller Table Chain
There are two types of Roller Table Chain: ST and RT.
- ST-type has special attachments that cover the upper side of the chain.
These attachments are level with the engineered plastic rollers, which permits low resistance as conveyed objects move across the chain and onto the engineered plastic rollers.
- RT-type does not have special attachments that cover the chain.
Therefore, side guides are required to prevent smaller conveyed objects from crossing the chain part of the assembly. If the conveyed objects are large (for example, pallets), they can cross the RT-type chain (Figure 5.15).
- ST-type is made of 304 stainless steel or nickel-plated carbon steel;
RT-type is made of stainless steel.
- The resistance during accumulating (line pressure) is low; the coefficient of rolling friction of engineered plastic roller is 0.06 ~ 0.10.
- ST-type is available in pitches ranging from 9.525 to 15.875 mm; RT-type from 9.525 to 19.05 mm. Because the pitch is small, Roller Table Chain is very effective at conveying small objects.
Selection and Handling
Engineered plastic rollers for Roller Table Chain are available in a wide range of effective widths: from 50 to 601.2 mm. Chain width is limited by the conveying capacity, which is usually expressed in kg/m2.
Figure 5.15 Two Types of Roller Table Chain