Nylon Moisture Treatment: Drying and Storage Guide
22 april 2026 | 7 minuten lezen
Nylon is notoriously hygroscopic, absorbing moisture from the air like a sponge. This moisture causes printing defects ranging from poor surface finish to complete print failure. The following drying, storage, and handling techniques apply to both FDM filaments and injection molding feedstock.
Waarom nylon vocht absorbeert
De chemische structuur van nylon bevat amidegroepen die waterstofbruggen vormen met watermoleculen. Dit hydrofiele karakter betekent dat nylon vocht absorbeert totdat het een evenwicht bereikt met de omgevingsvochtigheid.
Bij 50% relatieve vochtigheid kan nylon absorberen:
Doelgerichte oplossingen met nauwkeurige controle:
Temperatuurregeling: 40-80°C
Ingebouwde vochtigheidsbewaking
Spoelrotatie mogelijk
Directe invoer naar printer
Drogen in de oven
Voorzichtig gebruiken:
1. Voorverwarmen tot 70°C (nooit boven 80°C voor nylon)
2. Plaats de spoel op een rek (niet direct op metaal)
3. Prop deur iets open zodat vocht kan ontsnappen
4. Droog gedurende 4-6 uur
5. Laat volledig afkoelen voor gebruik
Waarschuwing: Veel ovens hebben temperatuurvariaties. Controleer dit met een thermometer.
1. Gebruik vacuümzakken die ontworpen zijn voor het bewaren van voedsel
2. Droogzakjes (silicagel) toevoegen
3. Onmiddellijk na het drogen afdichten
4. Etiket met datum en materiaalsoort
Systemen voor droge dozen
Actieve vochtigheidsregeling voor frequente gebruikers:
Passief: Luchtdichte verpakking met droogmiddel
Actief: Verwarmde box met vochtigheidsregeling
Hybride: Combinatie met directe voeding
Soorten droogmiddelen
Type
Capaciteit
Herbruikbaar
Kosten
Kiezelzuurgel
Goed
Ja
Laag
Moleculaire zeef
Uitstekend
Ja
Medium
Indicatie (blauw)
Goed
Ja
Laag
Beste praktijken voor preventie
Omgaan met regels
1. Stel de gloeidraad nooit bloot aan lucht
2. Onmiddellijk na het afdrukken opslaan
3. Gebruik droge dozen voor vochtige klimaten
4. Controleer de vochtigheid met een hygrometer
Milieubeheersing
Vochtigheid printkamer: Onder 40% RH ideaal
Vermijd printen tijdens regen/vochtige dagen
Airconditioning helpt de vochtigheid te verminderen
Overweeg ontvochtiger voor werkplaats
Testen op vocht
De eenvoudige test
Verwarm je spuitmond tot de printtemperatuur en extrudeer filament:
Droog nylon: Gladde, glanzende extrusie
Nat nylon: Sissen, knallen, bellen, ruw oppervlak
Gewichtsmeting
Voor nauwkeurige bepaling:
1. Weeg de spoel voor het drogen
2. Volledig drogen
3. Weeg opnieuw
4. Vochtpercentage berekenen
Beoogde vochtigheid: Onder 0,2% voor optimaal printen
FAQ
How do you know whether Nylon Moisture Treatment — Complete Drying & Storage Guide fits a part?
Nylon Moisture Treatment — Complete Drying & Storage Guide fits a part when its load capacity, temperature range, moisture exposure, wear behavior, and processing method match the real service conditions.
What properties should be checked for Nylon Moisture Treatment — Complete Drying & Storage Guide?
Controleer de sterkte, stijfheid, slagvastheid, hittebestendigheid, vochtopname, maatvastheid, wrijving, slijtage en chemische compatibiliteit.
What is the biggest selection risk for Nylon Moisture Treatment — Complete Drying & Storage Guide?
Het grootste risico is dat men zich baseert op een waarde uit een datasheet zonder rekening te houden met de daadwerkelijke omgeving, de verwerkingsmethode, de geometrie van het onderdeel en het gebruik op lange termijn.
When should Nylon Moisture Treatment — Complete Drying & Storage Guide be tested before production?
Het wordt aanbevolen om het onderdeel te testen wanneer het wordt blootgesteld aan belasting, hitte, chemicaliën, vocht, strenge toleranties, wettelijke voorschriften of een nieuwe bedrijfsomgeving.
Drying, Storage and Conditioning Are Different Steps
For procurement and process control, treat this as a nylon moisture treatment plan: remove moisture before processing, protect the dry material during transfer, and define the conditioning state used for inspection.
Nylon moisture control has three separate stages. Drying removes process moisture before the material is heated. Storage prevents the dried material from taking moisture back from the surrounding air. Conditioning changes the moisture state of a finished part after molding or printing and should be controlled as a separate engineering step. Treating these as one activity can produce unstable processing, changing dimensions and misleading test results.
The correct workflow depends on the material form. Pellets for injection molding, filament for additive manufacturing and molded parts do not share the same handling assumptions. Start with the exact grade, supplier drying guidance, package history, ambient humidity, dryer type, target process and the symptoms being investigated. A temperature and time copied from another nylon grade is not a reliable process specification.
Spool condition, dry-box humidity, drying cycle and a controlled test print
Dried material in transit
Reabsorption between dryer, hopper, machine and work area
Sealed container, exposure time, desiccant condition and opening record
Molded or printed part
Moisture changes toughness, stiffness, fit and dimensions after processing
Conditioning state, humidity, time and measurement timing
Resin-Pellet Drying Workflow
For molding, confirm whether the package is factory sealed, partially used or exposed to ambient air. Load only the quantity that can be dried and transferred within the approved handling window. The dryer should provide stable temperature and sufficiently dry air; a nominal setpoint alone does not prove that the material reached the required moisture state. Record the grade, lot, start time, setpoint, actual air condition, end time and transfer route.
After drying, move the resin through a closed or protected path into the hopper. Avoid open trays, uncovered bins and long pauses beside the machine. If a hopper dryer is used, record residence time and confirm that material is not bypassing the intended heat and airflow. For a material change, clean the hopper and conveying line so wet residue or a different polymer does not contaminate the next lot.
Process check
What to confirm
Waarom dit belangrijk is
Grade and lot
Exact polymer, filler, color and supplier lot
Different grades can require different temperature, time and moisture limits
Dryer condition
Actual temperature, airflow, dew point and calibration
Setpoint alone does not show the material received adequate drying
Residence time
Time in dryer and time from discharge to hopper
Prevents underdrying and unrecorded reabsorption
Moisture check
Method, sample location, result and acceptance limit
Links a material record to surface and mechanical results
Transfer
Sealed route, container condition and opening time
Protects the dry state before melting
Filament Drying and Sealed Storage
Filament needs the same discipline but a different workflow. A spool may have absorbed moisture before it was opened, and a dry box may protect it without removing moisture that is already inside the polymer. Drying time depends on filament diameter, polymer grade, spool size, dryer air movement and the starting condition. After drying, keep the spool in a controlled dry box or sealed package and limit the time it is exposed while loading the printer.
A test print can reveal improvement, but it is not a substitute for a moisture record when the part is safety-critical or dimensionally sensitive. Record nozzle, bed, chamber, material, drying history, storage condition and print orientation. For a narrow filament-specific workflow, use the nylon filament drying guide; this page keeps the molding, storage and cross-process decision together.
Dew Point, Verification and Reabsorption
Dew point describes the moisture condition of the drying air, while temperature and time describe the heat exposure. Both should be considered with airflow and material depth. A dryer that reports a low setpoint but has unstable dew point or poor air circulation may not deliver a repeatable result. Moisture analyzers, Karl Fischer testing or a validated supplier method can be used when the project requires a numerical limit. Use one method consistently and document its sample preparation.
Nylon can reabsorb moisture quickly after drying, especially in warm or humid conditions. The elapsed time between dryer, hopper and molding machine should be part of the process record. If a defect changes during a shift, compare material exposure time and storage condition before changing injection parameters. Surface splay, bubbles, silver streaks, poor layer bonding, reduced toughness and changing dimensions can have several causes, so confirm moisture alongside venting, melt temperature and contamination.
Supplier and Process Checklist
Exact nylon grade, filler, color, package condition and material lot.
Intended route: injection molding, extrusion, FDM, SLS, MJF or another process.
Dryer type, actual temperature, airflow, dew point, residence time and calibration.
Moisture test method, sample location, result and acceptance limit.
Sealed transfer, dry-box condition, exposure time and storage record.
Conditioning state for finished-part dimensions, mechanical tests and assembly.
For an RFQ or process review, send the grade, material form, package history, dryer data, observed defects, target properties and production route. We can help separate drying, storage and post-process conditioning so the material record supports stable molding, printing and inspection.
