System for producing back sealing strips

Abstract

The invention discloses a system for producing back seal strips. The system sequentially comprises an extruder, an extrusion mold, a herringbone frame, a traction roller group, a cooling roller group and a winding roller along the forwarding direction of materials, wherein the traction roller group comprises a heat-resistant rubber roller and a hollow steel roller internally filled with heating oil, and the hollow steel roller and a temperature controllable oil storage tank outside the hollow steel roller form a circulation circuit; a preheating device for preheating an inner layer of a film bubble is arranged at the herringbone frame at the front end of the traction roller group, a heat sealing roller group for heat sealing the compressed film bubble is arranged at the rear end of the traction roller group, the compressed film bubble winds the surface of the heat sealing roller group in an S shape to form a sheet, a shape setting roller group for setting the shape of the heat sealed sheet is arranged at the rear end of the heat sealing roller group, and the heat sealed sheet passes through gaps of the shape setting roller group in a line shape; and a one-way longitudinal drawing mechanism and a thickness detection mechanism are sequentially arranged between the shape setting roller group and the cooling roller group. The system for producing the back seal strips can be used for producing the high-strength back seal strips with 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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