Considerations for Using Dispensing Brushes

Pre-Dispensing Preparation Key

Brush Selection: Choose an applicator brush with appropriate material and specifications based on the adhesive type, viscosity, and dispensing process requirements. For example, high-viscosity adhesives may require a brush with stiffer, denser bristles to facilitate pickup and application. For low-viscosity adhesives, a softer brush with sparser bristles is more suitable to prevent excessive flow.

Brush Cleaning: Before first use, clean new dispensing brushes with a suitable solvent (e.g., alcohol, etc., selected based on adhesive properties) to remove residual impurities and oils from manufacturing, preventing adhesive contamination. Used brushes can be wiped down if reused shortly afterward. For extended storage or adhesive changes, thoroughly clean and air-dry brushes to prevent adhesive curing on bristles, which could impair future performance.

Adhesive Preparation: Ensure adhesive is uniform and free of sediment. Dilute according to specified ratios if necessary. Simultaneously, monitor the adhesive's shelf life and storage conditions to avoid using degraded adhesive that could compromise dispensing results.

During Dispensing Operation

Appropriate Adhesive Pickup: When dipping the dispensing brush into adhesive, control the immersion depth to prevent excessive pickup causing drips and waste, or insufficient pickup affecting dispensing efficiency and continuity. Generally, immersing 1/3 to 1/2 of the brush bristle length is optimal.

Application Pressure: Maintain steady, consistent pressure during dispensing. Excessive pressure may cause over-extrusion, compromising precision and potentially damaging the substrate surface. Insufficient pressure prevents even coverage, resulting in incomplete dispensing.

Application Speed: Adjust the application speed based on the adhesive's drying rate and process requirements. For fast-drying adhesives, increase the speed to prevent drying on the brush. For slow-drying adhesives, reduce the speed to ensure precise placement and uniform shape.

Contamination Prevention: During dispensing, prevent brush contact with non-dispensing areas to avoid adhesive contamination on other product surfaces. Operators must maintain clean hands to prevent oil, dust, or other contaminants from transferring to the brush or adhesive.

Post-Dispensing Operations

Prompt Cleaning: Immediately clean the dispensing brush with a suitable solvent after completing the task. Gently squeeze the bristles during cleaning to ensure thorough contact with the cleaning solution, removing all adhesive residue. For stubborn residue, soak the brush briefly before cleaning.

Proper Storage: After cleaning, blot excess moisture with a clean towel and place the brush in a dry, well-ventilated area to air-dry naturally. Once dry, store the brush properly by hanging it or inserting it into a dedicated brush holder to prevent bristle deformation from compression.

Regular Inspection: Periodically inspect the dispensing brush for wear, such as loose or split bristles, or a loose handle. Replace the brush promptly if significant wear is detected to ensure the quality of subsequent dispensing tasks.