This is the third blog is a series on what makes a good glass factory trolley. The bearing surface is that part of the trolley which the payload of glass and/or windows leans against. Glass is easily scratched or shelled which makes it worthless, so keeping the glass in pristine condition within the factory environment is vital, and difficult.
Key attributes for the bearing surface of a glass and/or window trolley are :
1. Soft to the touch. A hard surface will chatter and potentially damage the glass or windows as the trolley is wheeled over uneven surfaces.
2. Not rubber. Rubber has oils which will soak into the glass surface. They may not be noticeable but if the glass gets condensation the marks then the rubber residue becomes very clear.
3. Not carpet or foam. These products will hold debris and swarf and then rub against the glass and/or windows. The bearing surface needs to be difficult to penetrate.
4. Not slippery. The surface should hold the product.
5. Locked in place. Items which are glued in place will often come loose and the nature of most factories is that these trolleys can have sections of bearing surface missing for some time before they are replaced. An inserted section is better.
6. Long life. A product which wears or changes its consistency (such as becoming brittle) is useless.
There are very few products which meet this spec. We developed a polymer bearing surface specifically for the glass and window industry many years ago and it has proved to be brilliant in all the areas listed above. We have a version which fits into our 2 rolled steel sections, and a version which fits into our 4 aluminium sections. We supply these sections and inserts to the glass and window industry for upgrades to existing trolleys, but we don't supply trolley manufacturers as that is a large part of our business which we developed these components for!