Blow Molded Container Grip Region Repositioning
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Solution Overview
Problem
Conventional blow molding techniques struggle to form containers with deep protrusions, such as grips and bases, due to insufficient material orientation and distribution, leading to issues like deformation, instability, and increased weight, which affects the structural integrity and ergonomic feel of the container.
Innovation Solution
A method involving a mold with a recess and a movable gripping region that is inflated and then repositioned inward before filling, allowing for increased crystallinity and reduced material trapping, thereby enhancing the container's rigidity and design flexibility while maintaining minimal weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If conventional blow molding is used to form deep protrusions like grips, then material becomes trapped in the grip regions, but other regions of the container are starved of material
Solution Approach 1:
The mold cavity is pre-designed with variable depth regions, where the grip regions have greater depth than other regions. This preliminary structural arrangement allows material to be strategically directed to deep protrusion areas during the blow molding process, ensuring proper material distribution without trapping excess material in grip regions.
Solution Approach 2:
The mold cavity employs local quality variation by creating regions with different depths - deeper regions for grips and shallower regions for other container parts. This localized depth differentiation enables precise control over material flow and distribution, allowing each region to receive the appropriate amount of material for its specific functional requirements.
2Quantity of substance
If container weight is increased to provide sufficient material for all parts, then material distribution improves, but container weight increases
Solution Approach 1:
The mold cavity employs local quality variation by creating regions with different depths - deeper regions for grips and shallower regions for other container parts. This localized depth differentiation enables precise control over material flow and distribution, allowing each region to receive the appropriate amount of material for its specific functional requirements.
Solution Approach 2:
The invention changes the geometric parameter of the mold cavity by varying the depth of different regions. By adjusting the cavity depth locally rather than uniformly, the process optimizes material distribution while maintaining efficient material usage and minimizing overall container weight.
3Shape
If deep protrusions are formed in the mold, then specific container sections are created, but plastic material is less able to flow and stretch around the protrusion due to contact friction
Solution Approach 1:
The mold cavity is pre-designed with variable depth regions, where the grip regions have greater depth than other regions. This preliminary structural arrangement allows material to be strategically directed to deep protrusion areas during the blow molding process, ensuring proper material distribution without trapping excess material in grip regions.
Solution Approach 2:
The invention changes the geometric parameter of the mold cavity by varying the depth of different regions. By adjusting the cavity depth locally rather than uniformly, the process optimizes material flow and stretching characteristics, reducing the negative effects of contact friction in deep protrusion areas.
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 improves the structural integrity and ergonomic feel of containers by increasing material orientation and reducing weight, while simplifying the mold setup and reducing costs, thus overcoming the limitations of conventional methods.
Implementation Method 1
a gas is forced into the perform causing it to stretch and to take the shape of the mold
Implementation Method 2
the preform is blown to form the container... causing it to stretch and to take the shape of the mold
Implementation Method 3
increases orientation of material at a region of the blow molded container... increasing crystallinity
Data Source
AI summary
A container forming assembly and method includes receiving a parison within a cavity of a mold, enclosing the parison within the mold having a wall with a recess, inflating the parison in the mold to form a blow molded container where the blow molded container has a sidewall, a movable region formed at the recess, and a hinge circumscribing an interface between the sidewall and the movable region, and moving the movable region toward an interior of the blow molded container about the hinge before filling. Furthermore, a method for forming a container includes receiving a parison, enclosing the parison with a mold that includes a cavity, and inflating the parison in said mold to form a blow molded container with a moveable region at the cavity. The method further includes repositioning the moveable region before filling the blow molded container.