Textile moisture meter

Fabric Moisture Control Process in the Garment Industry

As you may know, moisture plays a crucial role in the garment industry, directly impacting both the production process and product preservation. Particularly for goods like fabrics and clothing, preventing mold growth remains a top priority for many businesses.

In this article, EMIN will delve deeper into the significance of moisture in the garment sector and introduce advanced moisture control technologies currently trusted in the industry.

The Importance of Fabric Moisture Control

In actual production, fabric moisture directly affects how the material behaves during each stage: from cutting, sewing, ironing, to packaging and storage.

When fabric retains more moisture than necessary, especially natural fibers like cotton or viscose, shrinkage after sewing is likely to occur, leading to products not matching original designs and resulting in mass defects. Conversely, overly dry fabric surfaces can become brittle, prone to breakage, or unstable when processed through high-speed sewing machines.

Another common issue is mold in fabric storage. High environmental humidity, combined with moisture-laden fabrics, creates conditions conducive to microbial growth, particularly in enclosed, poorly ventilated storage. Mold stains can spread, are difficult to treat, and sometimes necessitate discarding entire batches, causing tangible losses.

Additionally, fabric moisture affects cutting precision. In many garment factories, fabric layers are stacked for mass cutting. If moisture levels vary between layers, cutting blades may not interact uniformly, resulting in misaligned components, especially with stretchy or thick fabrics.

Areas Requiring Effective Moisture Control

Moisture control shouldn't be generalized but implemented specifically in the following areas:

1. Incoming Fabric Warehouse

This area receives and stores all fabric materials from suppliers. Failing to maintain stable humidity—typically between 50–60% RH depending on the fabric type—can lead to fabrics absorbing moisture from the air, especially during humid seasons or days. Consequences include moldy surfaces, unusual spots, or slight deformations, making fabric layers uneven for cutting. This area should be equipped with environmental humidity meters and appropriately powered dehumidifiers.

2. Fabric Spreading and Cutting Area

Before spreading fabric on cutting tables, each roll's moisture level should be checked, particularly for shrink-prone fabrics like cotton or modal. Cutting damp fabric can result in finished products deviating in size after drying or heat pressing.

3. Sewing Workshop

4. Finished Goods Warehouse

After completion, products often await packaging and shipping for days or weeks. If storage conditions aren't controlled—e.g., humidity exceeding 65% RH—products can reabsorb moisture, leading to mold in folds or slight discoloration, especially in light-colored items. Hence, many factories now use desiccant packets or silica gel in packaging to maintain product stability until reaching customers.

Moisture Control Operation Procedure

Below is a practical procedure adopted by many export-oriented factories to ensure product stability before packaging:

Step 1: Transfer Products to Dehumidification Room Post-Production

Immediately after sewing, ironing, and inspection, products should be moved to a humidity-controlled area, typically a sealed room equipped with industrial dehumidifiers. The goal is to restore product moisture to standard levels (usually between 45–55% RH), preventing moisture accumulation in folds or inner fabric layers. At this point, technicians record the start time for monitoring the entire cycle.

Step 2: Moisture Check After 2 Hours of Treatment

After approximately 2 hours, QA teams or technicians randomly sample products in the room to measure surface and inner fabric moisture using specialized non-invasive moisture meters. If moisture levels aren't within standards, products remain in the room for an additional 30–60 minutes before rechecking. All checks are documented with batch codes and personnel details.

Step 3: Move to Packaging Area with Stable Temperature and Humidity

Once moisture levels meet requirements, goods are transferred to the packaging area. Here, environmental conditions should also be controlled, typically at 25–27°C and 50–55% RH, ensuring products don't reabsorb moisture during boxing or pre-shipment waiting. For exports to markets with stringent standards (e.g., Japan, EU), this step often includes adding desiccant packets inside packaging.

Popular Fabric Moisture Meters Available at EMIN

Below are three devices distributed by EMIN, widely chosen in the textile industry for their rapid, non-destructive testing and high accuracy:

AP&T AP-125C Handheld Fabric Moisture Meter

The AP&T AP-125C is a compact handheld device, ideal for factories needing quick moisture checks across various areas like incoming fabric warehouses, cutting zones, or random production inspections. It employs a non-invasive resistance measurement method, providing instant results upon probe contact with the fabric surface without damaging samples.

Advantages: No sample cutting required, simple operation, convenient for warehouse staff, QA, or technicians to use on-site without needing lab facilities.

Practical Application: Used for rapid moisture assessment upon fabric receipt, aiding early detection of moisture absorption during transportation—a common cause of mold or fabric deformation.

DEKKO DM300S Fabric Moisture Meter

The DEKKO DM300S is a semi-professional device with a pin-type probe, allowing deep moisture measurement within thick fabric bundles or packaged fabric. It features multiple measurement scales compatible with various textile materials, offering flexibility for diverse applications.

Advantages: High accuracy in measuring internal layers, inaccessible to surface-only devices.

Practical Application: Commonly used before distributing fabric to sewing lines, especially for thick, multi-layered fabrics, ensuring outer dryness isn't misleading when inner cores remain moist—a hidden cause of post-production shrinkage.

3. LUTRON MS-7003 Fabric Moisture Meter

The MS-7003 is a specialized device suitable for QA/QC departments, technical centers, or export businesses requiring stringent product quality control. It allows customization for different fabric types and can connect to software for data storage and report generation.

Advantages: High stability and repeatability, usable as a reference device for calibrating or cross-verifying other rapid measurement tools in the factory.

Practical Application: Employed in final quality checks before packaging and dispatch, particularly effective for export orders demanding strict technical compliance and accompanying documentation.