A back seal production system

Abstract

The invention discloses a back seal production system. The system sequentially includes an extruder, an extrusion die, a herringbone frame, a traction roller group, a cooling roller group, and a winding roller according to the advancing direction of materials. The traction roller group consists of It is composed of heat-resistant rubber roller and hollow steel roller with internal heating oil. The hollow steel roller and the temperature-controllable oil storage tank outside the hollow steel roller form a circulation loop; The preheating device for preheating the inner layer is installed at the rear end of the traction roller group so that the flattened film bubble is heat-sealed on the heat-sealing roller group, and the flattened film bubble bypasses the surface of the heat-sealing roller group in an S shape to form a sheet. At the rear end of the heat-sealing roller group, there is a shaping roller group to shape the sheet after heat-sealing, and the sheet after heat-sealing passes through the gap of the shaping roller group in a straight line; a unidirectional Longitudinal stretching mechanism and thickness detection mechanism. This production system enables the production of back seals with high strength and low elongation at break.

Description

technical field [0001] The invention relates to a plastic production system, in particular to a back seal production system. Background technique [0002] Paper packaging boxes for milk and other packaging are made of cartons and back seals. Among them, the back seal of the packaging box is mostly made of co-extruded blown film, which has high transparency, high barrier performance, and high interlayer peeling strength, but the co-extruded blown film has low strength and high elongation at break. On the high-speed packaging production line, Due to the difference in line speed, the co-extrusion blown film is intermittently stretched when it is combined with the main body of the package, which will lead to the unevenness of the back seal material, which will lead to poor back seal effect, so it is difficult to adapt to the high-speed packaging production line and cannot improve Line speed for boxes. [0003] In contrast, the film compounded by casting (such as PE / glue / PET / gl...

AI Technical Summary

Problems solved by technology

Among them, the back seal of the packaging box is mostly made of co-extruded blown film, which has high transparency, high barrier performance, and high interlayer peeling strength, but the co-extruded blown film has low strength and high elongation at break. On the high-speed packaging production line, Due to the difference in line speed, the co-extrusion blown film is intermittently stretched when it is combined with the main body of the package, which will lead to the unevenness of the back seal material, which will lead to poor back seal effect, so it is difficult to adapt to the high-speed packaging production line and cannot improve Line speed for boxes

[0003] In contrast, the film compounded by casting (such as PE / glue / PET / glue / PE) can be very thick, and the interlayer is biaxially stretched, with high strength and low elongation at break, which is more suitable for high-speed However, the layers of the cast composite film are compounded by adhesives, so the interlayer composite strength is low, and it is easy to cause interlayer peeling as a back seal

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