Plastic color-printed composite packaging manufacturer and plastic flexible packaging solutions
05
2021
-
01
A Lesson in Knowledge: A Brief Discussion of Factors Affecting the Heat-Sealability of Plastic Packaging Bags
Plastic packaging bags are products manufactured by plastic‑packaging bag producers, made from plastic as the raw material and used to package a wide variety of everyday items. They are extensively employed in both daily life and industrial production. Now, let’s take a closer look.
Qingdao Platinum Packaging Technology Co., Ltd. is a manufacturing enterprise specializing in plastic flexible packaging, encompassing the research and development of new plastic materials, printing, lamination, slitting, bag-making, and related R&D. The company’s production base is located in the Jiaobei Industrial Park, Jiaozhou City, Qingdao, while its business operations and R&D center are situated in the Shinan District of Qingdao. With many years of experience, the company produces high‑quality plastic flexible packaging materials and comprehensive packaging solutions. Its main product lines include: laminated plastic packaging bags, color‑printed packaging bags, food‑grade packaging bags, vacuum‑sealed bags, retort pouches, low‑temperature frozen‑food bags, cat litter bags, and rolls of automatic packaging films for food and medical applications; as well as transfer printing films, warning tapes, flag‑type tapes, bird‑repellent tapes, and cable ties for air conditioners, among others.
Plastic packaging bag The product manufactured by the factory is a plastic‑based packaging bag used for a wide range of everyday items, and it finds extensive application in both daily life and industrial production. Now, let’s take a closer look.
Different plastic packaging bags exhibit varying heat‑sealability. For packaging granular, high‑density foods, the bags must have strong heat‑seal strength; however, for lightweight, finely powdered substances like laundry detergent—prone to dust generation during packaging—the soft‑packaging material should possess excellent heat‑seal performance to prevent particle loss. Once the heat‑seal material is selected, the quality of the seal also depends on the sealing process, with temperature, pressure, and time being the primary parameters to control. During heat sealing, temperatures above the melting point render the plastic film viscous; meanwhile, the applied sealing pressure provides the external driving force that promotes interfacial molecular penetration and diffusion in the molten state.
A sufficient heat-sealing time allows the interfacial molecules of the plastic film to rapidly interpenetrate and diffuse, causing the interface to disappear and forming a unified whole, thereby achieving excellent sealability. The lower heat-sealing temperature of a sealing material is determined by its melting temperature; the heat-sealing temperature should be higher than the material’s melting temperature.
That concludes today’s presentation. For more information, please visit our official website. 
Plastic packaging bag
Qingdao SINOY Packaging Technology Co., Ltd. is a specialized manufacturer of plastic flexible packaging.
Contact Us
Factory Address: Zhuzhu Road, Jiaoxi Industrial Park, Jiaozhou City, Qingdao
Office Address: 27th Floor, No. 32 Hong Kong Middle Road, Shinan District, Qingdao City
