Imagine, do not pass the test equipment, how to quickly distinguish between PP, PC, PMMA, PS these plastic materials?
I've seen a manager who has worked with plastic for a lifetime. When he got some plastic granules, he just chewed it in his mouth to tell what it was like. Oh no, what's plastic? (Picture is too strong, please own brain)
In the absence of test equipment, analytical laboratories, experienced people, through the density, the phenomenon of combustion and appearance of color, product performance to distinguish between different.
When the plastic coloring, it is difficult to directly see with the naked eye what kind of plastic, but also the industry experience concluded 'look, hear, smell, pressure, throw, bite' approach to comprehensive identification.
But first of all, the quickest and easiest way to reverse the plastic is to differentiate the plastic according to the purpose and type of the finished product. This method is not very elaborate, but it can handle most situations and is the method we usually use.
Here are some commonly used plastic scene:
This method needs to be very familiar with the plastic, because a product is usually not just a combination of the workpiece, on this basis, through another point of view - appearance and feel, combined to identify.
Through the appearance of the hand can initially identify the major categories of plastic products: thermoplastics, thermosetting plastics or elastomers.
General thermoplastics are crystalline and amorphous two types of crystalline plastic appearance was translucent, opaque or opacity, the film state was transparent, the hardness, then, from soft to horny will have thermosetting plastic usually contain filler and not transparent material Clear, transparent without filler. Elastomer with a rubbery feel, a certain degree of elongation.
About sub-class after the need to use theoretical knowledge and experience to determine the specific ingredients, for example:
However, it is not very accurate to identify the plastic either by pushing back the product or by combining the appearance of the product. Plastic components of a single component are not necessarily clear, let alone multi-component copolymers.
So, in the daily simple identification of plastic process, what can be done to quickly identify the plastic method?
Burning identification is a more popular method, it is the use of small fire burning plastic samples to observe the fire in the fire and when the flammability of fire, while attention to flameout, the drop of molten plastic form and odor to identify the type of plastic method .
In the actual operation of rapid identification of plastic, usually get a plastic parts, through the observation of the rapid confirmation of the scope, and then identified by combustion.
According to the characteristics of the above plastic, when we encounter an unknown plastic parts, can be identified by burning one by one control analysis, can be considered more convenient and accurate method.
Of course, the above is a summary of the experience of the old drivers, in fact, still need a lot of material contact and understanding to support the ability to quickly identify plastic products. So see the old drivers 'biting' approach to identify some Plastic, do not be surprised, in the hearts of the old driver, has been through the classification method, roughly determine what kind of possible, and then through the hardness density (bite a bite) to confirm what is plastic.