Multi-Chamber Container Welding Mold Design
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Solution Overview
Problem
Conventional multiple-chamber container manufacturing methods result in weak bonding strength at connection portions due to reduced welded areas, leading to potential separation and shape deviations from the designed form.
Innovation Solution
A manufacturing device and method utilizing a first mold with a smaller accommodating space for preforms to form an intermediate molded body with a connection portion by directly welding trunk portions, followed by inflation in a second larger mold to form the exterior shape, enhancing bonding strength and maintaining the designed shape of the connection portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a partition member is inserted between preforms during blow molding, then the connection portion shape can be supported, but the welded area is reduced and bonding strength is weakened
Solution Approach 1:
The invention removes the partition member from the blow molding process entirely. Instead of inserting a partition member between preforms, the patent uses a mold structure where the preforms are blown directly against each other, eliminating the need for partition members and allowing direct welding contact between trunk portions.
Solution Approach 2:
The invention performs preliminary positioning of preforms in a first mold with a smaller accommodating space before the actual blow molding. This preliminary arrangement ensures that when gas is blown, the trunk portions are already positioned to weld directly against each other, maximizing the welded area before the final shaping occurs.
2Manufacturing precision
If preforms are blown in a large accommodating space, then the exterior shape can be formed accurately, but the connection portion may deform into various shapes different from design
Solution Approach 1:
The invention divides the blow molding process into two distinct stages using two different molds. The first mold with smaller accommodating space is used specifically for forming the connection portion and welding trunk portions. The second mold with larger accommodating space is then used for forming the final exterior shape. This segmentation allows each mold to optimize for its specific function.
Solution Approach 2:
The invention dynamically changes the mold configuration during the blow molding process. The process transitions from a constrained first mold environment that forces the connection portion into a specific shape, to a larger second mold environment that allows the final exterior shape to be formed. This dynamic adaptation ensures both connection portion integrity and exterior shape accuracy.
3Strength
If trunk portions are welded at high temperature, then bonding can occur, but the welded surfaces may collapse or deform
Solution Approach 1:
The invention uses the mold structure itself as an intermediary that provides mechanical support during the welding process. The first mold's smaller accommodating space acts as a confining structure that prevents the welded surfaces from collapsing or deforming while the high-temperature welding occurs. The mold walls provide the necessary support for the trunk portions to maintain their shape during bonding.
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
The solution effectively increases the bonding strength of the connection portion and prevents shape deviations, ensuring a stable and accurately formed multiple-chamber container.
Implementation Method 1
a first blowing unit configured to blow gas into the plurality of preforms arranged in the first accommodating space to inflate the plurality of preforms
Implementation Method 2
a second blowing unit configured to blow gas into the intermediate molded body arranged in the second accommodating space to inflate the intermediate molded body
Implementation Method 3
a heating unit configured to heat the plurality of preforms arranged in the first accommodating space
Implementation Method 4
the trunk portions of the preforms are welded to each other, thereby manufacturing an intermediate molded body having a connection portion
Data Source
AI summary
A manufacturing device of the present invention includes an intermediate molded body mold having a first accommodating space capable of accommodating a plurality of preforms, each preform having a mouth portion and a trunk portion; an intermediate molded body blowing unit configured to blow gas into the plurality of preforms arranged in the first accommodating space to inflate the plurality of preforms, thereby manufacturing an intermediate molded body having a connection portion formed by the trunk portions of the plurality of preforms welded to each other; a final molded body mold having a second accommodating space larger than the first accommodating space; and a final molded body blowing unit configured to blow gas into the intermediate molded body arranged in the second accommodating space to inflate the intermediate molded body, thereby forming an exterior shape of a multiple-chamber container.