Injection blowing mold for high-capacity plastic hollow container and process method thereof

Abstract

The invention discloses an injection blowing mold for a high-capacity plastic hollow container and a process method thereof. The mold comprises an injection mold assembly and blowing mold assemblies, wherein the injection mold assembly comprises a movable mold and a fixed mold which are arranged in parallel and are centered left and right, and the two sides of the front end of the movable mold are provided with support brackets which are arranged on the guide rails of an injection molding machine in a sliding manner; the blowing mold assemblies are arranged on the support brackets; and a slide guide rail and an adjustable support guide rail which are used for installing the two blowing mold modules are horizontally arranged in parallel between the two support brackets. The injection blowing mold of the invention is directly applied to the common horizontal type injection molding machine, and solves the technical problem that the existing mold for producing a low-capacity plastic hollow container can not be used for producing the high-capacity plastic hollow container because of structural imperfection; the support brackets are additionally arranged to support the large and heavy movable mold and blowing mold assemblies in the high-capacity hollow container, thus forming scientific and reasonable rigid support; and the movable mold and the blowing mold assemblies can shift and operate stably, and the centering and locating operations are accurate.

Description

technical field [0001] The invention relates to a mold equipment for injection blowing plastics, in particular to a mold equipment for injection blowing large-capacity plastic hollow containers. [0002] The invention also relates to a process method for injecting and blowing large-capacity plastic hollow containers in mold equipment for injecting and blowing large-capacity plastic hollow containers. Background technique [0003] In the existing large-scale plastic hollow container process molding methods, the "extrusion-blow molding" method is basically used for production. The specific process of making large-scale plastic hollow containers by this method is: extruding the tubular shape through a plastic extruder. Material, and then blown by an independent blow mold to make a large plastic container, the appearance of the product has cracks, is not smooth, there are wastes on the bottle mouth and the bottom of the bottle, uneven, the size of the bottle mouth is not accurat...

AI Technical Summary

Problems solved by technology

The above-mentioned method is a two-step processing method. The problem is that during the processing, the injection molded parison is large and has a certain temperature. During the moving process, the material will sag, causing difficulty in moving and the parison is easily deformed.

However, its structure determines that it can only be used to produce small-capacity plastic hollow containers, and is not suitable for producing large-capacity plastic hollow containers. The main reasons are as follows: (1) Since the patented mold is used to produce small-capacity containers, its moving mold The volume of the fixed mold and the fixed mold is small, the lateral protrusion of the movable mold and the fixed mold is relatively small, and the centering deformation is small under the action of gravity. Therefore, the use of a common fixed structure can ensure accurate positioning and alignment. However, when producing large-capacity plastic hollow For containers (mainly referring to large-capacity plastic hollow containers with a volume of 5 to 200 liters), the volume and weight of the movable mold are correspondingly increased, and the lateral protrusion is also large. Therefore, when the structure of this patent is adopted, the movable mold Under the action of gravity, it will bend and deform downwards, and the positioning and alignment will not be accurate

(2) Since the patented mold is used to produce small-capacity containers, the volume and weight of the blow mold components are relatively small, and the blow molding module is supported and positioned by a push device installed on the movable mold to ensure accurate positioning. Additional positioning device, and if the large-capacity plastic hollow container is produced, the volume and weight of the required blow mold components will increase accordingly. The phenomenon of downward offset, inaccurate positioning, unstable production, resulting in product deformation and high scrap rate

(3) Since the patented mold is used to produce small-capacity containers, the parison is relatively small, and the blow molding quality of the product can be guaranteed without stretching the parison during the blow molding process of the parison forming mandrel. When the capacity of the plastic hollow container is high, the parison is relatively large. If the parison is not stretched, blow molding will be difficult, and it will easily lead to uneven blow molding products, blow molding holes and other blow molding failures, and the scrap rate will be high.

The above-mentioned technical difficulties have led to no technology to produce large-capacity plastic containers using a similar mold process.

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