Body thickened plastic bottle preform

Abstract

The invention relates to a blank body thickening type plastic bottle blank. The blank body thickening type plastic bottle blank comprises a bottleneck and a blank body, wherein a connecting section is formed between the bottleneck and the blank body, a splicing convex ring and a retention ring are arranged on the outer wall of the bottleneck, and a blank bottom is formed at the bottom of the blank body. The blank body thickening type plastic bottle blank is characterized in that 2 to 8 thickening layers are arranged on the outer wall of the blank body, the middle parts of the transverse cross sections of the thickening layers are thick, both sides of the transverse cross sections of the thickening layers are gradually thinned and are bulged outwards in an arc shape, the upper parts of the longitudinal cross sections of the thickening layers are thick, and the lower parts of the longitudinal cross sections of the thickening layers are gradually thinned. When blow molding is performed on the bottle blank, the thickening layers correspond to the corners of an inner cavity of a mold, so that after the blow molding is performed on a watering bucket, the corners need to be stretched more (the stretch ratio from the center of the bottle blank to the wall of the bucket is 1:3.8, and the stretch ratio from the center of the bottle blank to the corners is 1:5.5), but sufficient wall thickness is supplied to the corners by the thickening layers, and the wall thickness of the stretched watering bucket is uniform, thereby increasing the thickness and structural strength of the corners of the watering bucket, increasing the rate of finished products and guaranteeing the service life of the watering bucket.

Description

technical field [0001] The invention relates to a plastic bottle blank, in particular to a thickened plastic bottle blank for a drinking bucket. Background technique [0002] Along with the continuous improvement of people's living standards, water dispensers are widely used in public places such as companies, hospitals, restaurants, and in families. In order to attract the attention of consumers, more and more enterprises put more energy into the shape design of drinking water barrels. Some of them are made into square, hexagonal, or octagonal shapes, etc., but the drinking water barrels are made into square or hexagonal shapes. Shape or octagon, because the distance from the corner of the polygonal bucket to the center of the drinking bucket is relatively long, while the distance from the wall of the bucket to the center of the drinking bucket is relatively close, so the degree of stretching of the bucket corner is greater. If the plastic preform is still round The cylind...

AI Technical Summary

Problems solved by technology

[0002] Along with the continuous improvement of people's living standards, water dispensers are widely used in public places such as companies, hospitals, restaurants, and in families. In order to attract the attention of consumers, more and more enterprises put more energy into the shape design of drinking water barrels. Some of them are made into square, hexagonal, or octagonal shapes, etc., but the drinking water barrels are made into square or hexagonal shapes. Shape or octagon, because the distance from the corner of the polygonal bucket to the center of the drinking bucket is relatively long, while the distance from the wall of the bucket to the center of the drinking bucket is relatively close, so the degree of stretching of the bucket corners is greater. If the plastic preform is still round The cylindrical body will cause the wall of the blow-molded drinking bucket to be thinner at the corner, making the wall thickness of the whole drinking bucket uneven, thus affecting the structural strength and service life of the corner of the polygonal drinking bucket, and the wall of the bucket at the corner Thin is easy to blow the bottle, and the yield is low

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