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The Production Process of BOPP Packaging Tape

Adhesive tapes have become indispensable in both daily life and industrial applications, with their manufacturing process incorporating advanced technologies and specialized techniques. Below is a detailed explanation of the production process for standard BOPP packaging tape.

1. Raw Material Preparation

Base Material Selection:
The core material of BOPP packaging tape is biaxially oriented polypropylene (BOPP) film. This engineered film offers:

• Exceptional optical clarity

• Superior tensile strength

• Excellent flexibility

• Dimensional stability

Manufacturers carefully select BOPP films with thicknesses ranging from 20 to 50 microns (μm) based on specific application requirements. For general-purpose packaging tapes, the industry typically uses 25-30 μm films, achieving the optimal balance between:
✓ Cost efficiency
✓ Mechanical performance

✓ Application versatility

2. Adhesive Formulation
The adhesive system is the critical component that determines the tape's bonding performance. Most BOPP packaging tapes utilize acrylic-based adhesives, which offer:

• Consistent tack properties

• Excellent aging resistance

• Stable performance across temperature variations

Production Process:

1. Precise formulation by combining:

   • Acrylate monomers

   • Polymerization initiators

   • Specialty solvents

   • Performance additives

2. Controlled polymerization in reactors with strict regulation of:

   • Temperature profiles (±0.5°C)

   • • Reaction duration

     • Agitation parameters

   • Advanced additive package:

     • Plasticizers for enhanced flexibility

     • Antioxidants for long-term stability

     • UV stabilizers for outdoor applications

   • The resulting adhesive delivers:
     ✓ Immediate tack strength
     ✓ Permanent bonding capability
     ✓ Resistance to environmental factors
     ✓ Consistent performance across various substrates

   •  

     This sophisticated manufacturing process ensures that BOPP packaging tapes meet the demanding requirements of both commercial and industrial applications while maintaining cost-effectiveness for mass production.

      

     Coating Equipment Setup:
     After preparing the substrate and adhesive, the process moves to the coating stage. The coating equipment primarily consists of:

   • Unwinding unit – Feeds the BOPP film smoothly into the system

   • Coating head – Applies adhesive uniformly onto the film

   •  

   • Drying oven – Evaporates solvents and cures the adhesive

   • Rewinding unit – Collects the coated film for further processing

   • Coating Equipment Setup:
     After preparing the substrate and adhesive, the process moves to the coating stage. The coating equipment primarily consists of:

3. Unwinding unit – Feeds the BOPP film smoothly into the system

4. Coating head – Applies adhesive uniformly onto the film

5. Prior to coating, precise equipment calibration is essential:
   ✔ Tension adjustment on the unwinder to prevent wrinkles or over-stretching of the BOPP film
   ✔ Coating gap and speed calibration to ensure even adhesive distribution
   ✔ Drying temperature profiling for optimal solvent evaporation

6.  

   Coating Operation:
   Once calibrated, the BOPP film is fed from the unwinder and passes under the coating head. Common coating methods include:

7. Gravure Coating:

8. The coating head employs an engraved roller with microscopic cavities

9. Adhesive fills these cavities and transfers onto the film surface

10. Delivers precise coating weights (typically 15-30 g/m²)

11. Comma Blade Coating:

12. A precision-metered blade spreads adhesive uniformly

13. Allows thicker coating layers when required

14. The coated film immediately enters the drying tunnel where:
    ✓ Hot air/IR heating (80-120°C) evaporates solvents
    ✓ Residence time (1-3 minutes) is adjusted based on:

15.  

16. Line speed (typically 50-150 m/min)

17. Coating thickness

18. Adhesive formulation

19. This controlled drying ensures:

20. Complete solvent removal (<0.5% residual)

21. Proper adhesive curing

22. Strong interfacial bonding between adhesive and film

23. The rewinder then collects the finished product with:
    ✔ Consistent tension control
    ✔ Precision edge alignment
    ✔ Defect-free winding for downstream slitting

24. To Be Continued...