3º ESO Plásticos 3 Técnicas de fabricación

3º ESO Plásticos 3 Técnicas de fabricación

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Language: English

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00:00
hi guys today I am going to explain some techniques to make plastic pieces there are many of them but we only will study the most common today we will explain compression extraction injection and blowing so let's begin compression this technique is called compression or thermo compression is applied usually to
00:33
thermosetting plastic like for example bakelite the plastic as you can see is played in a steel mold this is the plastic which is placed in still mode and heated you can see the hitters so the plastic a acquires a paste consistency this is the plastic now we
01:02
have paste consistency a traveling press apply pressure so the plastic takes on the shape of the mold after that the plastic is cooled so again we have pieces that persist high temperatures so with this processor process we come with a manufacture for sample handles versus
01:37
pans or handles for frying pans and it's very useful to make for example also electrical insulators for circuits or obvious book boxes and it easy next next technique is called extrusion in this processor we put the plastic radials into a hover into a hopper sorry
02:09
and the plastic is pushed through the nozzle this is the nozzle the whole nozzle using a warm gear this is the one peer that presses the plastic through the nozzle the plastic at the same time is heated by the heaters they the shape of the nozzle this is the shape of the nozzle is
02:40
exactly they say the same shape at the end product this part is called as chiller so this is the name of the technique comes from this chiller with this technique we can produce long pieces long products but always with the same shape exactly the shape of the
03:09
nozzle this is the nozzle injection in this case the tech the technique is very similar to the before technique the raw material again is placed in a hopper and the Studer compacts and melted plastic thanks to a worm here that makes the depressor and the heaters that hit the plastic until it is melted and the
03:45
extruder inserted by means of pressure into a metal multi plastic so you can see here the mold in the plastic insert it by means of pressure at the end the plastic is cool so that it hardens and the finished product is removed from the mold this is one of the more common techniques with this
04:20
technique we can produce complex shapes with very precise measurements some protein some objects produced with these techniques are for example buckets containers plastic year's casing for cellphones and it is a the last technique for today is blow for me again we have an intruder with a worm here and
04:54
some heaters to make molten plastic in this process molten plastic is given a tubular shape with the use of this further the plastic is that inserted into a mold air pressurised air is blown inside a small until the plastic takes the shape of the walls this technique is used to make all types of containers and
05:28
others hollow objects you can see some examples of objects made with low for me and this is all for today thank you for your attention let's see in class tomorrow

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