Blow Molding Mold with Rotating Pressurizing Member for Handle Attachment
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Solution Overview
Problem
Existing methods for manufacturing containers with handles suffer from decreased attachment strength when filled with high-temperature liquids, leading to potential detachment due to contraction or deformation.
Innovation Solution
A mold design featuring a pressurizing member that rotates to engage the handle with the container body, ensuring a deep and secure attachment by forming a handle engaging part that matches the shape of the handle, using a half-split mold with a recess for the container and a handle arrangement part that includes fixing pins and a pressurizing surface to enhance attachment strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the handle is previously molded separately and assembled to the container body by engagement, then the manufacturing process is simplified and the handle can be produced independently, but the attachment strength decreases when filled with high-temperature liquids due to contraction or deformation
Solution Approach 1:
The invention merges the handle and container body into a single integrated structure formed by blow-molding the handle onto the container body in one process. This eliminates the separate molding and assembly steps of conventional methods, while ensuring the handle maintains its shape and attachment strength even when filled with high-temperature liquids.
Solution Approach 2:
The handle is pre-formed with specific engagement protrusions that are designed to deeply engage with the container body during the blow-molding process. This preliminary design of the engagement structure ensures that the handle will maintain strong attachment under thermal conditions without requiring post-assembly adjustments.
2Device complexity
If the handle is integrated with the container body by engagement along the vertical direction, then the handle attachment is simplified, but the handle may detach when impact is applied such as dropping the bottle on the floor
Solution Approach 1:
The invention employs asymmetric engagement protrusions on the handle that extend in multiple directions rather than simple vertical engagement. This asymmetric design creates a more complex interlocking geometry that resists detachment from impact forces while maintaining relatively simple overall structure.
Solution Approach 2:
The engagement protrusions are designed with curved surfaces that allow the handle to flex and absorb impact forces. The curved geometry enables the handle to deform elastically under impact and return to its original position, preventing permanent detachment while maintaining structural integrity.
3Ease of manufacture
If blow molding is performed with the preform caught by engaging parts formed to upper and lower portions of the handle, then the handle and container body are integrated, but the wall thickness and strength at the engagement region may be insufficient
Solution Approach 1:
The invention applies local quality by concentrating additional material at the engagement region where the handle attaches to the container body. The blow-molding process is controlled to deposit thicker resin specifically at these engagement points, ensuring sufficient wall thickness and strength where it is most needed without adding unnecessary weight elsewhere.
Solution Approach 2:
The invention changes the molding parameters during the blow-molding process to control material distribution. By adjusting pressure, temperature, and timing parameters, the process ensures adequate wall thickness at the engagement region while maintaining overall lightweight construction of the container.
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 prevents handle detachment by forming a handle engaging part that securely attaches the handle to the container, maintaining high attachment strength even when filled with high-temperature liquids, and allows for efficient mass production with high reproducibility.
Implementation Method 1
a pressurizing member (11) configured to rotate about a rotational shaft (12), wherein a pressurizing surface (11a) of the pressurizing member (11) is arranged in a position at an outside beyond an inner wall surface (3a)
Data Source
Figure 1(a)~1(b)
Figure 2(a)~2(d)
Figure 3
AI summary
An object of the invention is to provide a mold for a container with a handle capable of manufacturing the container with the handle in which the handle is hardly detached. A container with a handle, in which a handle (5) is engaged with a portion of the container, is manufactured by arranging the handle (5) in a handle arrangement part (6), inserting a bottomed tubular preform into a cavity of a mold and performing blow molding. The mold includes an inner wall surface (3a) that forms an external shape of the container and a pressurizing member (11) that forms a handle engaging part engaging with the handle (5) to a portion of the container, and the pressurizing member (11) is capable of moving between a first position which is a position at an outer side of the inner wall surface (3 a) and a second position at which a portion of the inner wall surface (3a) is formed.