A look at straw lines

We've spent numerous years supplying customers with the greatest blank mould gauges available. This is something we couldn't have accomplished without our outstanding knowledge. Whenever clients approach us, we do whatever is necessary to meet their specifications.

A glass bottle's body can have a myriad of different imperfections or features. You can observe and classify them. There are those features that manufacturers included intentionally. However, there are others that weren't so intentional. These include sagging spots, slumps, straw lines, and stretch marks. People also consider whittle marks and bubbles to be defects. Despite not being deliberate, they don't always undermine the bottle's use. 

The flaw we'll be looking more closely at here is straw lines or marks.

What do these lines look like?

These are hair fine wavy lines. They appear on the surface of the glass body, either in patterns or alone. Straw lines are physically etched into the exterior. You're able to feel them as a sharp catch or tick when you run your fingernail across the surface.

There is another kind of straw line you may notice. If you bury glass in earth it seems to produce this one. The chemical weathering reactions between the glass surface and soil are important too. There's an assumption here. It's that these lines have no direct link to the bottle's production processes. Yet, they could have something to do with an unfinished mixing of the glass batch. 

In any case, it's likely that the straw lines relate to the chemistry of the glass. The material includes lime, soda, and sand mainly. The water soluble soda content is the part that's easiest to leach out. This can occur when glass encounters moisture and soil. It is possible it could result in the lines.

At Penico Gauges, we know that more container manufacturers are purchasing our blank mould gauges worldwide. As such, we must follow the proper manufacturing features. It doesn't matter how specific your needs are. We'll make certain your gauge suits your application. We also calibrate in-house to ensure each one is accurate.

If you would like our assistance, please get in touch.