The guy on the screen

When I use to work in a glass container plant, we use to have a sort of private joke among ourselves whenever we were facing a problem in the line. In those – frequent … - occasions we would use to say that the problem fault was from the guy that was on the screen … Commonly referred as the “screen”, this is a human visual inspection performed in the Cold End as the containers pass in front of an on line light box (light screen). Usually this is done by an operator sitting in some sort of a chair on the Cold End, immediately after the last of the automatic inspection machines (although few production lines have light box screens additionally installed before the first inspection machine). It

A real challenge to the inspection machine

In a glass container plant – automatic inspection machines – are considered to be the basic pillar of the quality control system. The inspection machines are able to inspect 100% of the glass containers that are produced. The others inspection and controls are based on sampling – stratified or random accordingly with a sampling plan - and therefore less powerful. Being such an important tool it is crucial that are implemented control measures to assure that the machines are always performing accordingly with the best set-up. I am often questioned about the capabilities of different models of inspection machines: which ones are the best? Are the ones that I have OK? Perhaps politically correc

It´s the communication, stupid!

By nature glass is a material which is peculiar. It is very strong if undamaged and very weak if severely scratched. Its strength it is highly dependable of the surface condition and the presence of stress concentrators. Glass container production is a high speed mass production process. Some defects may be present for a short time and then disappear, other might pop-up unexpectedly. Glass container production will never result in “zero defective”. Glass containers are primary packaging and thus the allowable number of defective bottles is low. Any glass production line therefore needs to have a variety of container inspections (machines, human) to detect and remove non-conforming bottles an

Quality Control (QC) activities in a glass container plant – Overview.

In the glass container manufacturing process everything starts with the reception and storing of the different raw materials. As a first step, in order to make it possible to control the quality of the incoming raw materials, it is necessary that the glass manufacturer establishes a technical specification for each raw material that is used to produce glass. Cullet – recycled glass from external or internal origin – should be treated like any other raw material; therefore a technical specification should be developed as well for cullet. Typically the specification defines optimum and normal reject limits for key parameters specific of each raw material: chemical composition and grain size. P

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