custom logo canvas makeup Pouches bag bulk 

The production process for canvas cosmetic bags manufacturers encompasses material control, precision processing, and quality assurance:

1. Material Screening and Pretreatment

Base Material Selection

The primary fabric is 300D-600D cotton canvas (warp count ≥ 60 threads/inch). Accessories include rust-proof resin zippers, plated hardware (magnetic buckles/D-rings), and a breathable mesh lining. Fabric color variation and hardware plating integrity are fully inspected before storage.

Pre-Shrinking

The canvas undergoes pre-shrinking to eliminate the risk of subsequent deformation. Untreated fabric shrinks by up to 3% when exposed to moisture.

2. Precision Cutting

Laser Precision Cutting

Complex curved parts are cut using a CO₂ laser (accuracy ±0.1mm). Positioning pins prevent displacement when stacking multiple layers of fabric.

Hydraulic Cutting

Straight pieces are processed in batches on a hydraulic cutting machine, and the edges are pre-coated with anti-fraying adhesive.

III. Sewing and Structural Reinforcement

Main Sewing Process

The bag body is chain-stitched using an industrial lockstitch machine, with the speed reduced to 800 stitches per minute at corners to prevent skipped stitches.

The stress point (handle base) is reinforced with a triangular cross stitch, and the zipper seam is 1.5mm from the teeth to ensure smoothness.

Functional Component Integration

The inner pocket edges are reinforced with backstitching, and the mesh interlayer is ultrasonically cut to prevent snagging.

IV. Decoration and Surface Treatment

Hot Stamping and Embroidery

The heat transfer temperature is controlled at 180°C ± 5°C, and the embroidery stitch density is ≥ 12 stitches/cm.

Hand-Painting Process

Custom designs are hand-painted with waterproof paint and require air drying to set the shape.

V. Three-Level Quality Inspection Process

Initial Inspection

The first 20 pieces are fully inspected for dimensional tolerance (≤ 0.3cm) and thread tension (≥ 50N).

Process Inspection

Zipper opening and closing smoothness is randomly inspected hourly (≥ 100 times without jamming). Final Inspection

A light inspection bench is used to check for thread ends ≥ 0.2mm. Oscillation impact testing is performed to ensure handles bear a load of ≥ 5kg.

VI. Packaging and Storage Specifications

Moisture-Proof Packaging

High-end models are individually packaged in PE film with a silica gel desiccant. Standard models are packaged in OPP bags of 5 pieces per group.

Warehouse Management

Shelves are kept 20cm above the ground to avoid moisture. Maintain a humidity level of 45%-55%.

Processing: Digital printing requires a color difference of ΔE ≤ 1.5. Hot stamping with excessive temperatures will cause carbonization of the fibers.

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