L-type sealers (L Bar) can also be categorized according to product sizes into set height models, and packing height adjustable models. Set height models are suitable for general flat-box products such as cosmetic, skincare products, books, and stationery boxes. Packing height adjustable models are designed for larger or more three-dimensional products, including gift boxes, canned goods, multi-pack products, and health supplement boxes. By adjusting the height of working table, operators can easily pack different sizes products. 

Machines designed for different packaging heights offer distinct advantages in practical applications. For example, low-height products can utilize high-speed sealing modes to improve mass production efficiency, while taller packaged products require sufficient film space to prevent deformation caused by overly tight sealing. By selecting the appropriate machine model, manufacturers can not only improve sealing quality and packaging appearance, but also reduce film waste and equipment wear, thereby enhancing overall production efficiency.