Double Tube Sampling Lance

Mechanical Action

Concentric metal tubes rotate relative to each other to open and close matching wall apertures along the probe length. Operators push the sealed assembly into the resin bed before turning the inner sleeve to expose internal receiving chambers. Pellets flow simultaneously through multiple openings along the vertical profile into the hollow core.

Reversing the rotation locks the collected material inside the chambers before extraction from the container.

Contamination Risk

Cross-contamination occurs when residual polymer particles remain trapped between concentric wall surfaces from prior sampling events. Scratches on interior sleeve walls harbour moisture and fine particles, corrupting subsequent material assays. Regular disassembly and cleaning prevent false positives during purity testing.

Sample Integrity

Representative sampling prevents processing delays caused by out-of-specification material entering hopper systems. Obtaining core samples across vertical strata ensures moisture content determinations reflect the entire container volume rather than surface conditions. Laboratory tests perform melt flow rate and moisture analysis on these samples to verify supplier certificates.

Proper sampling protocols protect moulders from accepting contaminated batches.