wholesale clear nylon makeup bag supplier

The production process for transparent nylon cosmetic bags is as follows:

1. Substrate Processing

BOPA Film Application

Biaxially oriented polyamide film (BOPA) is a mainstream substrate due to its high barrier properties, puncture resistance (withstands puncture forces exceeding 5kg), and low-temperature brittleness (-60°C). Its thickness is typically controlled between 15-30μm, with a light transmittance of ≥92%.

Compound Reinforced Structure

BoPA film is laminated with nylon mesh using a hot-melt adhesive process, increasing tear strength by 300% while maintaining the transparent effect. The edges are pre-coated with anti-fragmentation adhesive to prevent fiber shedding after cutting.

2. Precision Cutting

Laser Precision Cutting

Special-shaped parts are cut using a CO₂ laser (accuracy ±0.1mm), while straight cuts are processed using a hydraulic cutting machine. Positioning pins are used to prevent displacement when stacking multiple layers.

High-Frequency Seamless Welding

Seams are welded using high-frequency hot-press welding instead of traditional stitching to eliminate the risk of pinhole leakage. The welding temperature is strictly controlled at 130°C ±5°C to prevent material deformation.

III. Functional Components

Waterproof Zipper System

Rust-resistant resin zipper teeth are synchronously embedded with TPU waterproof adhesive strips. The stitching maintains a 1.2mm pitch, ensuring smooth opening and closing for tens of thousands of cycles.

Three-Dimensional Binding

The bag's opening features a 45° angled TPU binding strip. High-frequency heat pressing ensures a close fit between the binding and the base material, increasing edge wear resistance by 50%.

IV. Surface Treatment

UV Reverse Hot Stamping

Partially applied with reverse UV technology (alternating varnish and matte finishes), a high-contrast mirror/matte texture is created on the transparent surface. The pattern overprint error is ≤0.3mm.

Environmentally Friendly Coating

Applied with a nano-grade anti-scratch coating (hardness ≥3H), the light transmittance loss is less than 2%, effectively resisting daily friction and scratches.

V. Quality Inspection and Packaging

Sealing Test

Negative pressure immersion test (-0.08MPa/30min) ensures leak-free operation. Oscillation impact test with a load capacity of ≥8kg.

Anti-fog packaging

Individually packaged in PE film with silica gel desiccant. Moisture-proof and recycling symbols are marked on the outer box.

Process Warning: BOPA film must be stored away from light to prevent yellowing. High-frequency welding with excessive temperatures can cause carbonization and perforation of the material.

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