High-barrier double-wall plastic bottle excellent in allround-performance and method for manufacturing same

Abstract

The invention relates to a high-resistant double-layer plastic bottle with better integrated property. The producing method comprises: selecting PET resin (outer layer) and PEN resin (inner resin) in right ratio; selecting double-material/double-color injection machine (or double-layer injection machine) and double-layer bottle blank mould; injecting two times (or synchronously injecting) to form double-layer blank, via bottle blank heating, mechanical preheating and bidirectional drawing injection to attain the product. The invention has high resistance property, better integrated property, lower cost and the application of bear and medicine.

Description

technical field [0001] The invention relates to a plastic bottle for packaging, especially a double-layer plastic bottle with high barrier property requirements and excellent comprehensive performance and a manufacturing method thereof. Background technique [0002] Existing plastic bottles have their own defects: (1) PET, PETG, PE, PP, PC and other plastic bottles for carbonated drinks, tea drinks, and cosmetic fillings have low barrier properties and insufficient heat resistance; The three-layer, five-layer and other multi-layer composite methods of barrier PVDC, EVOH, and MXD6 resins have complex components, and the inconsistency of their respective molding processes and performances leads to a low qualified rate of finished products, large investment in molding machinery, and serious adsorption on the bottle wall. , difficult to recycle and other disadvantages; (3) adopt the method of coating carbon film or silicon oxide film on the inner surface or outer surface of PET ...

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Problems solved by technology

[0002] Existing plastic bottles have their own defects: (1) PET, PETG, PE, PP, PC and other plastic bottles for carbonated drinks, tea drinks, and cosmetic fillings have low barrier properties and insufficient heat resistance; The three-layer, five-layer and other multi-layer composite methods of barrier PVDC, EVOH, and MXD6 resins have complex components, and the inconsistency of their respective molding processes and performances leads to a low qualified rate of finished products, large investment in molding machinery, and serious adsorption on the bottle wall. , difficult to recycle and other disadvantages; (3) adopt the method of coating carbon film or silicon oxide film on the inner surface or outer surface of PET bottle, its equipment and technical requirements are high, and the barrier layer is easy to damage; (4) The method of using PEN resin alone, The cost of raw materials is high; (5) The method of blending PET and PEN has insufficient barrier properties; (6) The method of blending PET with MXD6 has insufficient barrier properties and the transparency has decreased; (7) Adding nanomaterials to PET, adding More bottles are opaque, and less barrier effect is not obvious; (8) The two-layer extruded composite bottles of PETG, PET/PEN, etc. introduced in US Patent 6,068,900 have the following disadvantages: ① Squeeze blow bottle

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