Drying Glossary

A

ACD Series Compressed Air Dryer

A drying system that uses compressed plant air and optional membrane filters to remove moisture from materials.

ADC Series Desiccant Wheel Dryer

Compact desiccant wheel dryer designed for resin drying applications. Cart mounted with built in conveying capabilty for loading drying hopper and proces machine.

ADP Series Desiccant Wheel Dryer

A standalone desiccant wheel dryer designed for flexible hopper configurations and throughput requirements.

ADW Series Desiccant Wheel Dryer

A dryer utilizing desiccant wheel technology to provide reliable low-dew-point drying performance. Dryer is mounted directly on the drying hopper.

Air-to-Air Heat Exchange

A method of cooling process air by transferring heat to incoming air to improve efficiency.

Airflow

The movement of air through resin that carries moisture away during drying.

Ambient Exposure Time

The amount of time resin is exposed to open air, allowing moisture absorption.

Analytical Balance

A high-precision scale used for accurate moisture testing.

Angel Hair

Thin strand-like strings of plastic created during conveying or processing that can accumulate in material handling systems and disrupt material flow.

Angel Hair Trap

A conveying accessory designed to capture angel hair and fines before they enter the conveying system.


B

Batch Drying

A drying operation based on fixed material quantities rather than continuous flow.

Blisters

Surface defects caused by moisture expanding into steam during processing.

Bottle Strength

The structural integrity of a bottle, often affected by moisture content.

Brittleness

A loss of material toughness that makes parts more likely to crack or break.


C

Central Drying System

A centralized system that supplies dry air to multiple drying stations in a common area

Chemical Degradation

Damage to resin caused by chemical reactions, often involving moisture.

Closed-Loop Drying System

A drying system that recycles low-dew-point air through the hopper to dry hygroscopic resin.

Condensation

The conversion of water vapor into liquid moisture due to temperature changes.

Conveying Equipment

Equipment used to transport material from storage to processing machines or other storage vessels.

Cosmetic Defects

Visible imperfections that affect appearance but not necessarily strength.

Critical Processing Applications

Applications requiring precise moisture control to maintain product quality and performance.


D

Desiccant

A moisture-absorbing material used to remove moisture from air.

Desiccant Bed Dryer

A dryer that uses beads of desiccant material to remove moisture.

Desiccant Dryer

A dryer that uses desiccant media to remove internal moisture from hygroscopic materials.

Desiccant Wheel Dryer

A dryer using a rotating desiccant-coated wheel to continuously dry process air with consistent dew point.

Dew Point

The temperature at which moisture condenses from the air.

Die Corrosion

Material damage to extrusion dies caused by moisture-related byproducts.

Drying Hopper

An insulated vessel where heated air flows through plastic resin to remove moisture prior to processing. ACS drying hoppers include AH, SD, MH, and WH Series models.

Drying Parameters

Controlled variables such as temperature, airflow, and time used in drying.

Drying Temperature

The set temperature used to dry a specific resin.

Drying Time

The duration resin is exposed to drying conditions.


H

Heat

Thermal energy used to drive moisture out of resin.

Honeycomb Rotor

A structured desiccant wheel that maximizes moisture absorption surface area.

Hot Air Dryer

A dryer for non-hygroscopic materials that uses heated ambient air to remove surface moisture.

Hydrolysis

A chemical reaction where moisture breaks polymer chains, reducing strength.

Hygroscopic Materials

Materials that absorb moisture into their molecular structure.


I

Injection Molding

A manufacturing process where molten plastic is injected into molds.

Internal Moisture

Moisture absorbed within the resin's molecular structure rather than remaining on the surface.


K

Karl Fischer Titration

A precise chemical method for measuring moisture content.


L

Line Stability

Stable material output during extrusion.

Loss on Drying (LOD)

A method that measures moisture by recording weight loss after heating.


M

Material Protection Management (MPM)

An ACS dryer control feature that helps prevent resin damage caused by improper drying conditions.

Material Selection Table

Stored material profiles containing recommended drying parameters.

Mechanical Properties

Physical characteristics such as strength and toughness.

Microbubbles

Tiny vapor bubbles formed when moisture turns to steam.

Moisture Content

The total amount of water present in resin.

Moisture Monitoring System

Devices that continuously track moisture levels.


P

Paint Adhesion

The ability of coatings to bond properly to plastic parts.

Polymer Chain

A repeating molecular structure forming plastic materials.

Portable Dew Point Meter

A handheld device used to measure air dryness.

Process Air

Conditioned air supplied by the dryer to remove moisture from plastic resin.

Process Stability

More consistent material flow and melt quality resulting from proper drying.

Profile Extrusion

An extrusion process used to create continuous plastic profiles with a fixed cross-section.


R

Reduced Structural Integrity

Reduced load-bearing capability of a part due to internal defects or material degradation.

Regeneration

The process of removing absorbed moisture from desiccant to restore its drying ability.

Relative Humidity

The percentage of water vapor in the air compared to the maximum amount the air can hold at a given temperature.

Residence Time

The amount of time resin remains in a drying hopper to achieve the required moisture level.

Resin Degradation

Breakdown of polymer chains due to heat or moisture.

Return Air Temperature

The temperature of air returning from the drying hopper to the dryer, often monitored to optimize drying performance.


S

Safety Loading System (SLS)

An ACS dryer feature designed to help ensure proper and safe material loading.

Seven-Day Timer

A scheduling feature used to automatically control dryer operation times.

Sheet Extrusion

A process used to produce flat plastic sheets.

Silver Streaks

Visible streaks on molded parts caused by moisture vaporizing during molding.

Sink Marks

Surface depressions caused by uneven cooling or material shrinkage.

Smart Mode (SMS)

An ACS automatic drying mode that continuously adjusts operating conditions to optimize drying performance and energy usage.

Splay

Surface defects appearing as streaks or lines, typically caused by moisture or gas release during molding.

Surface Moisture

Moisture present on the outside surface of resin pellets.

Surging

Pulsating or inconsistent material flow during extrusion.


T

Thermal Degradation

Material damage caused by excessive heat.

Thermoplastics

Polymer materials that soften when heated and harden when cooled, allowing them to be repeatedly reshaped and recycled without changing their chemical structure.

Thermoset Plastic

A polymer material that permantly hardens during curing and cannot be melted, reshaped, or remolded once set.

Throughput Stability

Stable and uniform material output achieved through proper drying and process control.

Touchscreen Control

Icon-based interface used to monitor and control dryer operation using a touch sensitive screen.


V

Variable Airflow Control

An ACS feature that adjusts dryer airflow according to process requirements, reducing energy consumption while maintaining drying performance.

Voids

Internal air or gas pockets within molded or extruded parts that weaken structural integrity.


W

Water Vapor

Moisture in gaseous form present in air.

Wave Marks

Surface irregularities on extruded products that appear as repeating waves or ripples due to unstable processing conditions.


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