What are the key technical indicators of BOPP synthetic paper?

The key technical indicators of BOPP synthetic paper (usually referred to as biaxial polypropylene film, that is, BOPP film) mainly include the following aspects:

1. Physical properties

Tensile strength: BOPP synthetic paper needs to have sufficient tensile strength to ensure that it is not easy to break during packaging, printing, etc. In general, longitudinal tensile strength greater than 140N/mm² and transverse tensile strength greater than 220N/mm² are common requirements.

Elongation at break: Elongation at break reflects the toughness of the material. For BOPP synthetic paper, the proper elongation at break ensures that it is not easy to break while maintaining good shape stability during packaging. In general, the longitudinal break elongation is controlled below 200%, and the transverse break elongation is controlled below 80%.

Elastic modulus: Elastic modulus is a measure of a material's ability to resist deformation. BOPP synthetic paper generally requires an elastic modulus of more than 2000N/mm² to ensure that it can maintain a stable shape during use.

2. Optical performance

Transmittance: Transmittance is a key index to measure the transparency of the film. The high transmittance of BOPP synthetic paper can provide better visual effects and make the packaging more beautiful.

Fog degree: Fog degree is another important parameter that reflects the transparency of the film. Low fog BOPP synthetic paper can make the packaging look more clear and bright.

3. Barrier performance

Gas barrier: BOPP synthetic paper needs to have good gas barrier performance to prevent oxygen, water vapor and other gases from penetrating, so as to protect the packaging from the influence of the external environment.

Water vapor transmittance: Water vapor transmittance is an important index to measure the film's ability to block water vapor. For packages that require moisture resistance, the water vapor transmission rate of BOPP synthetic paper should be as low as possible.

4. Heat sealing performance

Thermal sealing strength: Thermal sealing strength is a key indicator to measure the thermal sealing performance of the film. BOPP synthetic paper needs to have a good heat sealing strength to ensure that a firm seal can be formed during the heat sealing process to prevent the leakage of the package.

Heat sealing range: The heat sealing range refers to the ability of the film to effectively heat seal within a certain temperature range. The wide heat sealing range can improve the adaptability and flexibility of packaging production.

5. Other properties

Friction coefficient: The appropriate friction coefficient can ensure that the BOPP synthetic paper can slide and transfer smoothly during the packaging process, improving the packaging efficiency.

Thickness uniformity: Thickness uniformity has a great impact on the performance of BOPP synthetic paper. The uneven thickness will not only affect the tensile strength and barrier properties of the film, but also affect the subsequent processing. Therefore, the thickness uniformity of the film needs to be strictly controlled during the production process.

In summary, the key technical indicators of BOPP synthetic paper cover physical properties, optical properties, barrier properties, heat sealing properties and some other important properties. These indicators together determine the quality and scope of application of BOPP synthetic paper. In the production process, these indicators need to be strictly controlled to ensure that the product quality meets the standard requirements.