Container manufacturing method, double container manufacturing method, double container, and method for discharging contents from double container
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Solution Overview
Problem
Existing methods for manufacturing double containers with multi-layer structures face challenges such as weak sealing parts due to direct blow molding, difficulty in separating different material components, and issues with pulling out inner bags due to insufficient rigidity and deformation of the mouth part.
Innovation Solution
The method involves forming a preform with a direct blow molded body that includes a protruding sealing part with an extension prevention structure, and a mouth part with an engaging mechanism for easy extraction, along with specific ratios and shapes to enhance rigidity and facilitate separation and discharge of contents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If direct blow molding is used to form preforms with multi-layer structure, then it becomes easy to manufacture preforms with multi-layer structure, but the sealing part becomes weak and may tear during biaxial stretch blow molding
Solution Approach 1:
The patent applies local quality by providing an extension prevention structure specifically at the sealing part of the direct blow molded body, while other parts maintain normal thickness. This localized reinforcement strengthens the sealing part without affecting the overall multi-layer structure manufacturing ease.
Solution Approach 2:
The extension prevention structure is formed during the direct blow molding process itself, before the biaxial stretch blow molding occurs. This preliminary reinforcement prevents the sealing part from tearing during subsequent stretching operations.
2Loss of substance
If the inner bag is made with thin wall thickness to reduce material usage, then material consumption decreases, but the mouth part rigidity becomes insufficient making it difficult to pull out the inner bag
Solution Approach 1:
The patent provides an extension prevention structure specifically at the sealing part and mouth part areas where reinforcement is needed, while other parts of the inner bag maintain thin wall thickness. This localized reinforcement approach maintains overall material efficiency while ensuring sufficient rigidity at critical areas for easy pull-out.
3Adaptability or versatility
If the outer shell and inner bag are made of different materials to enable recycling separation, then recyclability improves, but the manufacturing process complexity increases
Solution Approach 1:
The patent divides the container into two separate components (outer shell and inner bag) that can be made from different materials. The inner bag is formed by direct blow molding and then placed within the outer shell through biaxial stretch blow molding, creating a separable double container structure that facilitates recycling while maintaining a relatively streamlined manufacturing process.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach strengthens the sealing part, allows easy separation of inner and outer components, and ensures smooth extraction of the inner bag, reducing residual contents and enhancing recyclability.
Implementation Method 1
a sealing part, formed by welding inner surfaces of the tubular parison to each other
Implementation Method 2
performing biaxial stretch blow molding on a preform to manufacture the container main body
Data Source
AI summary
The present invention provides a method for manufacturing a container, in which the occurrence of tears at a part corresponding to the sealing part of a preform is preventable during manufacture of the container by performing biaxial stretch blow molding on the preform formed by direct blow molding. The present invention provides a method for manufacturing a container, comprising a step of manufacturing a container main body by performing biaxial stretch blow molding on a preform, wherein the preform includes a direct blow molded body formed by performing direct blow molding on a molten tubular parison, and the direct blow molded body is provided with a protruding sealing part in which a sealing part, formed by welding inner surfaces of the tubular parison to each other, protrudes from a main body part of the direct blow molded body.