The manufacturing process of the in-mold label material includes 3 parts, co-extrusion-biaxial stretching (unidirectional stretching)-post-processing. (1) Coextrusion Put resin particles of different compositions or formulations into different extruders respectively, enter the same extrusion port under the action of high temperature and pressure, and extrude composite film materials composed of resins of different compositions. (2) Bidirectional stretching The co-extruded material is stretched in the axial and circumferential directions under the action of a mechanical device to cause plastic deformation of its crystal lattice. The biaxially stretched material has improved strength and hardness, which is beneficial to processing and application. Generally, BOPP uses a bidirectional stretching process. (3) Unidirectional stretching After the film is uniaxially stretched and deformed, its strength and hardness are increased, and it can be elastically deformed in the transverse direction. It is more suitable for irregular bottles. Generally, PE + PT materials are uniaxially stretched. (4) Post-processing Post-treatment refers to corona or coating treatment on the surface of the material, and anilox rolling on the surface of the adhesive layer. Corona or surface coating can improve the printing suitability of the material, and the texture rolling will make the surface of the adhesive layer produce texture, which is convenient for exhaust. After the processed materials are rewound, the large roll is divided into small rolls or single sheets, and can be sent to customers as finished products. Tooth Whitening Toothpaste,Tooth Whitening Paste,Whitening Tooth Toothpaste,Cleaning Care Toothpaste Huai 'an Bst Trade Co., LTD , https://www.bstoral.com
Production process of in-mold label material