Analysis of the structure and performance of Carton sealing tape

I. Structural Composition

The Carton sealing tape consists of three basic layers:

Substrate layer: Typically made of biaxially oriented polypropylene film with a thickness ranging from 0.035 to 0.055 mm. This layer determines the tape's tensile strength (typically ≥40 MPa) and elongation at break.

Adhesive layer: The main component is acrylic polymer, which is attached to the substrate through precision coating technology. The thickness of the adhesive layer affects the initial adhesion and holding strength.

Release coating: Applied to the adhesive layer surface to ensure proper tape unwinding, with release force typically maintained between 2-8N/25mm².

II. Interpretation of Performance Parameters

Initial tack: A measure of the tape's initial adhesive strength, typically expressed in ball numbers. Standard box-Carton sealing tapes exhibit initial tack in the 12-16 ball range.

Adhesion: Reflects the adhesive performance of the tape, which should remain intact for 24 hours under standard test conditions without detachment.

Tensile strength: The longitudinal tensile strength typically ranges from 40 to 60 MPa, while the transverse strength is slightly lower.

Thickness tolerance: The thickness deviation of qualified products must be controlled within ±0.003mm.

III. Comparison of Tape Types

Clear tape: Light transmittance ≥90%, suitable for packaging that requires content visibility.

Color tape: Made with color masterbatch, providing light-blocking properties for classification labeling.

Printing tape: The company logo is added through gravure printing, with a precision of ±0.2mm.

Enhanced tape: By increasing the substrate thickness or adding glass fibers, the tensile strength can be improved by 30-50%.

IV. Application Matching Suggestions

Light packaging: recommended thickness 0.040-0.045mm, initial adhesion using No.12-14 steel balls.

Standard packaging: recommended thickness 0.045-0.050mm, initial adhesion using No.14-16 steel balls.

Repackaging: Select products with a thickness ≥0.050mm and initial adhesion strength ≥16 N/mm² (using steel balls).

Low-temperature environment: Adhesive formulations with a glass transition temperature below-20°C should be selected.

V. Usage Precautions

The construction temperature should be above 5℃, and the humidity below 80%.

Clean the surface before pasting to ensure it is free of oil and dust.

Apply 0.2-0.4MPa pressure to ensure the tape adheres properly.

The storage environment should be protected from light and moisture, with temperature maintained between 15-30°C.

VI. Industry Standard Reference

Thickness measurement shall be performed in accordance with GB/T 30776.

Initial Adhesion Test Based on GB/T 4852

Adhesion test shall refer to GB/T 4851

The determination of peel strength is conducted in accordance with GB/T 2792.

The technological evolution of Carton sealing tape is trending toward functional specialization, allowing customized parameter combinations to meet specific packaging requirements. When selecting tape, enterprises should conduct compatibility testing based on actual packaging dimensions, weight, and storage conditions. Qingdao Nuopai Packaging Co., Ltd. offers a diverse range of Carton sealing tape specifications and provides sample verification to ensure suitability according to client needs.