Abstract
This article provides comparison between the measured values of dunnage bag restraining forces and calculated values of restraining forces according to the draft version of Guidelines for Packing of Cargo Transport Units (CTU Code) for the dunnage bag of dimensions 60x120 cm and maximum filling pressure 0.2 bar.
Highlights
Accelerations during transport cause the movement of a cargo, especially sliding or tilting
The very important condition is that the dunnage bag should not be over the edge of the cargo
For the calculation of the maximum permissible force it is necessary to know contact surface A, which is expressed according to the CTU Code [1] as follows: Maximum gap in which the dunnage bag can be placed depends on chosen ratio between the contact transverse distance x and breadth of dunnage bag b in non-inflated state as follows: b – width of the dunnage bag [m], h – height of the dunnage bag [m], A – contact area between the dunnage bag and the cargo [m2] dx – gap between packages [m], π – 3.14159
Summary
Accelerations during transport cause the movement of a cargo, especially sliding or tilting. When dunnage bags are used as cargo securing equipment they should be able to secure cargo against sliding and tilting for different accelerations occurred during transport. E.g. paperboard can be placed between the cargo and the dunnage bag Another very important condition is that they should not touch the floor and can’t be placed between the last cargo section and container or trailer doors. It should be determined whether the dunnage bag is suitable for the particular gap. Required size and strength of the dunnage bag is determined by the size and weight of the cargo, gap where the dunnage bag is placed and accelerations which can occur during transport. With respect to the strength of the dunnage bag the blocking capacity of the dunnage bag must be higher than the forces acting on the dunnage bag by secured cargo
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