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DecorationHere’s the glass bottle screen printing and spray coating processes, including key steps, technical terms, and industry standards: 1. Glass Bottle Screen Printing Process 1.1 Preparation -Materials & Tools: -Screen Mesh:Custom-made photosensitive stencil (polyester or stainless steel mesh). -Ink:Glass-specific ink (high-temperature resistant, e.g., UV-curable or ceramic-frit ink). -Squeegee: Rubber or polyurethane blade (hardness: 60–80 Shore A). - Fixture: Precision alignment jig for bottle positioning. 1.2 Step-by-Step Process 1. Surface Cleaning: - Degrease with isopropyl alcohol or specialized cleaners to remove dust/oil. 2. Screen Alignment: - Secure the screen onto the printing machine; align with the bottle using optical sensors or mechanical guides. 3. Ink Application: - Pour ink onto the screen; apply uniform pressure (45–60° angle) with the squeegee to transfer the pattern. 4. Curing: - UV Ink: Instant curing under UV lamps (1–3 seconds). - Thermal-Cure Ink: Pre-dry in a conveyor oven (150–200°C for 5–10 minutes). 5. Multi-Color Printing: - Repeat steps with aligned screens for each color, curing between layers. 1.3 Post-Processing & Quality Control** - High-Temperature Firing (optional): - For ceramic-frit ink: Fire at 500–600°C (integrated with annealing) to bond ink permanently. - Inspection: - Check for clarity, color consistency, and edge sharpness. - Adhesion Test: Use tape peel-off method (ASTM D3359 standard). --- 2. Glass Bottle Spray Coating Process 2.1 Coating Types - Functional Coatings: -Hot-End Coating:Applied pre-annealing (e.g., tin oxide for scratch resistance). Cold-End Coating: Post-annealing (e.g., polyethylene or silicone oil for lubrication). - Decorative Coatings: Matte, glossy, or pearlescent finishes. 2.2 Step-by-Step Process 1. Surface Pretreatment: - Clean bottles; enhance adhesion via plasma treatment or flame priming. 2. Coating Setup: - Spray Equipment: Electrostatic spray guns (for uniform coverage) or HVLP (High Volume Low Pressure) guns. - Coating Mixing: Dilute to optimal viscosity (measured with a Ford cup). 3. Spray Application: -Automated: Robotic arms follow programmed paths (speed: 0.5–1.5 m/s). - Manual: Maintain 20–30 cm distance and 90° angle for even coating. 4. Curing/Drying: - Thermal Curing: Conveyor oven (120–180°C for 10–20 minutes). - UV Curing: Instant hardening under UV lamps (for UV coatings). 5. Quality Checks: - Measure coating thickness (10–30 μm) with a micrometer. - Test for defects (e.g., orange peel, runs) and abrasion resistance (Taber test). 3. Key Parameters & Troubleshooting Screen Printing | Issue | Cause | Solution | |-------|-------|----------| | Blurred Image | Incorrect squeegee pressure | Adjust pressure (3–5 kg/cm²) | | Poor Adhesion | Dirty surface or under-curing | Improve cleaning or increase curing time/temperature | Spray Coating | Issue | Cause | Solution | |-------|-------|----------| | Bubbling | Moisture contamination | Control humidity (<70%) or pre-dry bottles | | Color Shift | Inconsistent curing temperature | Calibrate oven zones (±5°C tolerance) | 4. Comparison: Screen Printing vs. Spray Coating | Aspect | Screen Printing | Spray Coating | |------------|---------------------|--------------------| | Applications | Detailed logos, multi-color designs | Uniform coatings, functional finishes | |Advantages | High durability, vibrant colors | Fast coverage, customizable textures | | Limitations | High setup cost for multi-color | Limited detail resolution | 5. Safety & Compliance - VOC Control: Use low-VOC coatings and install scrubbers/catalytic oxidizers. PPE: Respirators (NIOSH-approved), gloves, and eye protection. - Standards: Follow ISO 9001 (quality) and ISO 14001 (environmental). This workflow aligns with global glass manufacturing practices, suitable for technical documentation, cross-border audits, or training international teams. NextProduction |