High-performance double-layer polyester bottle

Abstract

The invention discloses a high-performance double layer polyester bottle, which selects PET resin as an outer layer, and another polyester resin with high barrier property as an inner layer, and color concentrate can not be added on the inner layer. A double material / double color injection molding machine or a double layer co-injection molding machine is adopted with a double layer perform mould, after the double layer compact is injected twice or synchronistically, the invention is made through the prewarming of a bottle perform heating machine and a bidirectional draw blow molding machine. The invention has the advantages that the high-performance double layer polyester bottle has higher barrier property and better sanitary property, can be applied to food bulking such as the beer, fruit juices, and medicines and so on under the condition of adding no anti corrosion agent or less anti corrosion agent.

Description

Technical field: [0001] The invention relates to a high-barrier plastic bottle for packaging, especially a high-performance double-layer polyester bottle with higher hygiene level and barrier property. technical background: [0002] The existing high-barrier plastic bottles have their own defects: (1) The three-layer, five-layer and other multi-layer composite methods of high-barrier PVDC, EVOH, and MXD6 resins in PET have complex components, and their respective molding processes and properties Disadvantages such as low pass rate of finished products caused by inconsistency, large investment in molding machinery, serious bottle wall adsorption, affecting taste, and difficulty in recycling; Its equipment and technical requirements are high, the barrier layer is easily damaged, and fragments enter the content; (4) Adding nanomaterials to PET brings additives with unknown hygienic performance, and the transparency decreases; (5) My patent 03145691.X, the outer layer The propo...

AI Technical Summary

Problems solved by technology

[0002] The existing high-barrier plastic bottles have their own defects: (1) The three-layer, five-layer and other multi-layer composite methods of high-barrier PVDC, EVOH, and MXD6 resins in PET have complex components, and their respective molding processes and properties Disadvantages such as low pass rate of finished products caused by inconsistency, large investment in molding machinery, serious bottle wall adsorption, affecting taste, and difficulty in recycling; Its equipment and technical requirements are high, the barrier layer is easily damaged, and fragments enter the content; (4) nanomaterials are added to PET, which brings additives with unknown hygienic performance, and the transparency decreases; (5) my patent 03145691.X, the outer layer The proportion of PET in the blended resin is too large, and molding is difficult; (6) The patent 200510085760.8 I applied for is too large in the glass transition temperature difference from the outer layer of PET, and the molding process is difficult to grasp; (7) I applied for it earlier. Patent 200610143872.9, the proportion of raw materials that can be used is not comprehensive, the blowing temperature range is not suitable, and the hygiene level needs to be further improved

Images