Handle Attachment Strength via Inclined Surfaces
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Solution Overview
Problem
Large-capacity resin containers with handles often experience reduced attachment strength and breakage at the attachment points due to wrinkles and gaps between the handle and the container, leading to compromised carrying convenience.
Innovation Solution
A handle design featuring elongated grip portions with upper and lower attachment arms, where the distal ends of these arms have inclined surfaces to facilitate smooth attachment of the preform during blow-molding, reducing gaps and wrinkles, and incorporating convex-shaped ribs on the lower attachment arm to enhance attachment strength and prevent breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If preform resin is inflated and pushed back to the final container size, then the handle attachment strength is enhanced, but wrinkles are generated on the pushed-back resin causing breakage
Solution Approach 1:
The invention changes the geometric parameters of the attachment arms by forming inclined surfaces on their inner surfaces. This parameter change allows the inflated preform to gradually attach to the attachment arms during blow-molding, preventing wrinkles while maintaining attachment strength. The inclined surfaces create a gradual transition zone that accommodates the preform's expansion without concentration of stress.
2Strength
If preform resin is inflated and pushed back to the final container size, then the handle attachment strength is enhanced, but gaps are created between the attachment arm and container side surface
Solution Approach 1:
The inclined surfaces on the attachment arms change the geometric parameters of the attachment interface. This allows the preform to gradually conform to the attachment arm shape during inflation, eliminating gaps between the attachment arm and container side surface while maintaining the enhanced attachment strength.
3Ease of operation
If the handle is attached to the container, then carrying convenience is improved, but the container becomes more prone to breakage at the attachment portion
Solution Approach 1:
By forming inclined surfaces on the inner surfaces of the attachment arms, the invention changes the geometric parameters to allow gradual attachment of the preform during blow-molding. This eliminates wrinkles at the attachment portion, thereby maintaining breakage resistance while preserving the carrying convenience provided by the handle.
4Volume of stationary object
If the container capacity is increased, then storage capability is improved, but the container weight increases reducing portability
Solution Approach 1:
The invention uses a thin-film handle structure made of the same resin as the container body. This flexible shell approach allows the handle to provide adequate strength for carrying large-capacity containers while minimizing additional weight. The thin-film construction reduces material usage compared to traditional rigid handle attachments.
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 significantly enhances the attachment strength of the handle to the container, reduces the occurrence of breakage at the attachment points, and allows for the same resin material to be used for both the container and handle, improving recyclability.
Implementation Method 1
when the handle is attached on the container by blow-molding, it is possible to cause parts of a preform, which are being inflated by blowing, to be gradually attached to the upper and lower attachment arms along the first inclined surface of the upper attachment arm and the second inclined surface of the lower attachment arm
Data Source
AI summary
A handle of the present invention is a handle configured to be attached on a side surface of a container body along an upward and downward direction of the container body, the handle including an elongated grip portion, an upper attachment arm provided on an upper side of the grip portion, and a lower attachment arm provided on a lower side of the grip portion, wherein on at least a part of a lower surface of a distal end side of the upper attachment arm, a first inclined surface is formed to be inclined toward A center portion of the grip portion, and on at least a part of an upper surface of a distal end side of the lower attachment arm, a second inclined surface is formed to be inclined toward the center portion of the grip portion.