§ 18
Is our 100-litre drying funnel large enough for the new PA order?
Answer: Hygroscopic materials such as PA, PC, PET and PBT must be dried before processing, otherwise the items get silver streaks, bubbles and reduced strength. The granulate must stay in the drying hopper for at least as long as the datasheet specifies, e.g. 4 hours at 80 °C. If the machine takes more than the hopper can dry, wet material gets through. The calculator works out the hopper you need and how long the granulate actually stays in the hopper you have.
Granulat der skal være i tragten = forbrug × tørretid
Tragtens rumfang = granulat ÷ rumvægt
Opholdstid i en given tragt = tragtens rumfang × rumvægt ÷ forbrug
Consumption is shot weight × shots per hour (inlet with also when it's ground again)
| Symbol | Meaning | Unit |
|---|---|---|
| forbrug | Machine's granulate consumption | kg/t |
| tid | Drying time (material datasheet) | timer |
| rumvaegt | Granulate bulk weight (typically 0.5-0.7) | kg/l |
| tragt | Your chute's volume | l |
| = | Hopper you need at minimum | l |
| = | Dwell time in your funnel | timer |
| = | Largest amount your hopper can dry | kg/t |
| = | Granulate in hopper | kg |
Does not apply when
The calculator's own default values inserted. The figures are calculated with exactly the formula the tool uses.
Substituted
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Hygroskopisk granulat som PA, PC, PET og PBT skal tørres i en bestemt tid, før det sprøjtes. Når en ny ordre skal køre, eller maskinen skal køre hurtigere, tjekker du, om tørretragten er stor nok til, at granulatet når at blive i den hele tørretiden.
En ny ordre i PA6 bruger 20 kg/t, databladet siger 4 timer ved 80 °C, og tørretragten er på 100 liter.
It means: Du skal bruge en tragt på mindst 133 l. I jeres tragt bliver granulatet kun 3 hours, og den kan højst tørre 15 kg/t. Brug en større tragt eller en fortørrer.
Lygteglas i PC bruger 12 kg/t, og PC skal tørres i 3 timer. Tragten er på 100 liter.
It means: Det kræver 55 l, og opholdstiden i jeres tragt er 5.4 hours. Tragten er stor nok.
Tragtens liter ≈ forbrug i kg/t × tørretid × 1,7.
Opholdstiden skal være mindst tørretiden.