Method for manufacturing highly heat resistant wide-mouth polyester container

Abstract

The invention discloses a method for manufacturing a highly heat resistant wide-mouth polyester container, belonging to the manufacturing method of polyester containers. The invention aims at providing a method for manufacturing a polyester container which can satisfy the requirements of hot filling and pasteurization processes. The method comprises material drying, parison pre-manufacturing and blow-forming. The method comprises the following steps: drying the mixed material of a PET resin with intrinsic viscosity of 0.78-0.85dl/g and weight percent of 60-80% and a PENT-8 resin with intrinsicviscosity of 0.78-0.85dl/g and weight percent of 20-40%, and ensuring the water content to be less than or equal to 0.005%; pre-manufacturing the parison according to the injection forming process; carrying out crystallization on the neck of the parison for 30-40s at 170-180 DEG C and setting for 48h at room temperature; and blow-forming the parison according to the blow-forming process, pressurizing and heat setting for 5-20s, cooling and opening molds. Each performance index of the container manufactured by the invention reaches or surpasses the Hot Filled PET Bottle Standard QB/T2665-2004.

Description

Technical field: [0001] The invention relates to a manufacturing method of a polyester container, in particular to a manufacturing method of a hot-filled polyester container with a caliber greater than 70 mm. Background technique: [0002] As we all know, PET resin containers are not only light in weight, strong in impact resistance, good physical and mechanical properties, but also have excellent chemical resistance, sanitation and fragrance retention. Its appearance is glass-like, with high transparency and surface gloss. Degree; is an ideal plastic product to replace glass containers. However, due to the poor heat resistance of pure PET resin containers, it can only be filled with food at about 60°C. Therefore, the product must be cooled to below 60°C before filling, which seriously hinders the improvement of production efficiency. Certain restrictions. [0003] At present, the heat-resistant resin containers on the market mainly include PEN resin single-layer containers and P...

AI Technical Summary

Problems solved by technology

Although the heat resistance and gas barrier properties of PEN resin single-layer containers are very ideal, the raw material price is 3 to 4 times that of PET resin, and it is difficult to be popularized and applied as packaging containers for ordinary goods.

However, only when the naphthalene content of the blend of PEN resin and PET resin reaches 40%, its glass transition temperature can reach 93.6°C, and the price is still high, which is still unacceptable in the market; When resin blends are used to make containers with a diameter greater than 70mm, the neck of the container is prone to stretching and deformation during the blow molding process, so usually only containers with a diameter of about 38mm can be produced