IPQC in makeup brush QC process

1. Check the production plan and bill of materials (BOM) to confirm that the bristles, ferrules, handles and other materials meet the specifications.
2. Confirm that the equipment parameters (such as tube pressing machine pressure, glue amount, baking temperature) are consistent with the process documents (SOP/SIP).
3. Check that the production environment (temperature, humidity, electrostatic protection) meets the requirements.

1. First inspection of key processes: such as brush head shape after pressing tube, glue dispensing amount, LOGO printing position, handle vertical etc., need to be confirmed to match the sample.
2. Three-inspection system: worker self-inspection → team leader re-inspection → IPQC special inspection, stamp and release after passing.

1. Operational standardization (such as whether the brush head is cleaned thoroughly and whether the hair trimming is done to remove the stray hair).
2. Equipment inspection (soldering iron temperature, electric screwdriver torque).
3. Material consistency (hair material, handle color match the order).

1. Identify and isolate defective products (such as split hairs, glue overflow), and trace the same batch of products.
2. Trigger abnormal process: When the defective rate exceeds 3%, issue a "Quality Abnormality Form" and require the engineering department to analyze and improve.

1. At the end of production, spot check the final piece to ensure that the entire batch of products has no batch defects.
2. Organize inspection records, first inspection reports, and defect statistics tables, and archive them for traceability.

1. Hair shaping: Manual shaping makeup brush head through special molds (cup) to ensure that the hair head has uniform curvature and clear layers;
2. Trimming and shaping: Use mold to ensure that the hair head shape is consistent, without stray hair or split ends.
3. Wire wrapping : Tie the hair head according to the brush type to prevent loose hair; after thread removal, the hair shape needs to be trimmed again.
4. Removing loose hair: Remove loose hair scraps through centrifuge or manual combing to avoid later bristle falling.

1. Angle and symmetry: The angle tolerance between the brush head and the brush handle is ≤2°. Symmetrical brushes (such as blush brushes) require visual inspection equipment to assist in calibration.
2. Gluing: The amount of glue used must be accurate (such as 0.07-0.53g/piece), and the glue gun temperature must be controlled at 120-150℃ to prevent overflow or degumming.
3. Baking: The setting temperature is 80℃±5℃ for 12 hours to avoid deformation of the brush head.
4. Connecting: After assemble the brush head and the handle, rotate 360° to check if any problem such as tilted head or gaps, and wipe off excess glue.
5. Glue strength: When glue connecting the brush head and the ferrule, the glue (epoxy resin or environmentally friendly glue) must pass the tensile test (such as ≥5kg tensile force without falling off).

1. Dust removal and cleaning: The brush head needs to be ultrasonically cleaned to remove dust and broken hair, and the amount of residual hair is ≤0.1%.
2. Disinfection: For animal hair, use ultraviolet light or ozone disinfection to ensure microbial indicators (such as total colony count <100CFU/g).

Surface and packaging

1. Printing: LOGO printing must be clear , and must pass 5 tape peeling tests to ensure no fading; the position and clarity of the inkjet coding must be consistent with the sample.
2. Surface treatment: Check whether the polishing is smooth and burr-free, and whether the paint/electroplating layer is uniform and free of bubbles.
3. Appearance: fully inspect the bristle firmness, handle scratches and other appearance issues before packaging.

1. Hair loss: Adjust glue gun pressure, refill glue and extend curing time
2. Hair head deformation : Add shape-fix and drying process
3. Brush head crook: Recalibrate cup mold and add head shaping process
4. Brush handle broken: Replace to tough material and strengthen injection temperature control
5. Handle painting peeling: Extend drying time and control workshop humidity ≤60%
6. Printing blurred: Use UV curing ink or increase surface treatment