White packaging container

Abstract

The invention relates to a plastic container for packaging, and particularly provides a white packaging container. The container wall of the white packaging container comprises a first light blocking layer and a second light blocking layer, wherein the first light blocking layer is an outer layer; and raw materials of the first light blocking layer comprise polyethylene glycol terephthalate and a first light blocking agent, the first light blocking agent is selected from at least one of white color master batch, white color oil and caesious color master batch, and raw materials of the second light blocking layer comprise polyethylene glycol terephthalate and a second light blocking agent. The first light blocking agent and the second light blocking agent are arranged in two layers, the first light blocking agent is added into the first light blocking layer, the second light blocking agent is added into the second light blocking layer, therefore the utilization rate and distribution uniformity of the light blocking agents can be improved, most importantly, the use amount of the whole light blocking agents is remarkably reduced while the same light blocking effect is achieved, the whiteness of the container wall is remarkably improved, and the attractiveness of the white packaging container is improved.

Description

technical field [0001] The invention relates to a packaging plastic container, in particular to a white packaging container. Background technique [0002] Polyethylene terephthalate (PET) container is a plastic packaging container made of PET as raw material through injection molding and blowing. PET material has the advantages of light material, strong structure and excellent chemical properties, so it is widely used in food The industry makes packaging containers, especially for beverage products such as carbonated drinks, water, tea, juices and energy drinks. [0003] However, the current PET containers used for dairy products can only achieve high barrier properties by mixing a large amount of light-blocking materials into PET. For example, the previous inventors studied adding a large amount of additives to PET raw materials, including Color masterbatch, purple masterbatch and oxygen absorber, although this kind of PET bottle can improve the light barrier effect to a c...

AI Technical Summary

Problems solved by technology

[0003] However, the current PET containers used for dairy products can only achieve high barrier properties by mixing a large amount of light-blocking materials into PET. For example, the previous inventors studied adding a large amount of additives to PET raw materials, including Color masterbatch, purple masterbatch and oxygen absorber, although this kind of PET bottle can improve the light barrier effect to a certain extent, but after too much barrier material is mixed, not only the production cost of the container is high, but the bottle body material is also easy The occurrence of uneven distribution leads to a significant decrease in the whiteness of the bottle body, and the color is blue-gray, which affects the aesthetics of the bottle (see Su Rina et al., Research on the barrier properties of PET bottles and the impact of yogurt quality, China Dairy Industry, 2019, (47): 7,5-64)

If the amount of light-blocking material is reduced, the light-blocking effect of the bottle will deteriorate, which will affect the storage stability of the product inside the bottle. Therefore, how to improve the whiteness of the container while ensuring the light-blocking effect of the container is for the protection and beauty of dairy products of great significance

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