Dynamic Low Temperature Partial Discharge Measurement Protocols in Offshore Cables
Sub-zero dynamic partial discharge testing requires combined dynamic flexure and sub-zero cooling to expose insulation micro-voids missed by ambient room tests.
Micro-Void Cavitation
Meaning
Microscopic pocket formation within polymer films occurs when protective packaging materials are subjected to excessive mechanical stress during transport. In manufacturing and distribution, micro-void cavitation reduces the barrier performance of plastic wrapping and product containers. This degradation exposes sensitive items to oxygen, moisture, and potential spoilage.
Structural Failure
High tension or vibration during shipping can cause the layers of a laminated film to separate at a microscopic level. This process of micro-void cavitation creates tiny empty spaces within the polymer structure that weaken its physical strength. Over time, these pockets grow and form larger cracks that compromise the integrity of the packaging.
Because these defects are invisible to the naked eye, they often go unnoticed until the product reaches the retail shelf and begins to spoil.
Quality Control
Manufacturers must perform regular stress tests on packaging materials to ensure they can withstand distribution. These tests involve simulating transport conditions, such as high vibration and drop tests, to check for microscopic structural changes. Spotting these issues early prevents defective batches of packaging from being used in final product assembly.
Contract Liability
Supply agreements often specify the resistance levels that packaging films must meet. If a batch of goods spoils due to material failure, the liability lies with the packaging supplier. These contracts use technical specifications to define the acceptable limits of material degradation during transport.