| 摘要 |
The invention is a chemically-inert tubing (100) constructed to retain its chemically inertness while bearing on its outer section color coding to identify the inner diameter of the tubing (100). Afirst colorless and chemically-inert tubing (27) is concentrically adhered to an outer colored and chemically-inert tubing (29) such that the inner tubing (27) remains entirely chemically inert while the jacket tubing (29) provides color coding as to first colorless tubing (27) inner diameter. A co-extruder (100) to concurrently and concentrically produce a first colorless and chemically-inert tubing (27) concentric and a colored and chemically-inert jacket tubing (29) such that the two tubings (27, 29) are adhered together to form tubing (50) at the instant of production is also provided.
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