Bottle Blowing Mold Ribs for PET Handle Attachment Stability
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Solution Overview
Problem
Bottles with self-contained PET handles face issues such as incomplete sealing, damage, and deformation during the bottle blowing process, particularly due to the handle deforming and not attaching properly to the mold, leading to quality defects like wrinkles and handle displacement.
Innovation Solution
A bottle blowing mold with ribs and grooves on the cavity wall to guide the preform's movement, preventing deformation and attachment issues, and a two-step process to form the handle and body separately, ensuring proper attachment and reducing production complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the bottle preform is heated to high temperature for blowing, then the bottle body part becomes soft and expandable, but the handle part remains too cold and stiff to attach properly to the mold
Solution Approach 1:
The mold cavity is divided into separate heating zones: a first heating assembly positioned at the handle part and a second heating assembly positioned at the bottle body part. This segmentation allows independent temperature control of different regions, enabling the handle area to be heated to appropriate temperatures for proper attachment while maintaining optimal blowing conditions for the bottle body.
2Productivity
If the preform is expanded to fill the bottle body part first, then the handle part is pushed to the mold wall by compressed air, but wrinkles form at the bottle shoulder and the handle lower end moves upward
Solution Approach 1:
The first heating assembly pre-heats the handle part before the blowing process begins, preparing it in advance for proper attachment to the mold wall. This preliminary heating action prevents the handle from deforming or moving upward during the subsequent expansion and compressed air pushing phases.
Solution Approach 2:
Different heating assemblies provide localized temperature control: the first heating assembly targets the handle part to ensure proper attachment, while the second heating assembly targets the bottle body part for optimal expandability. This local quality approach prevents wrinkles at the bottle shoulder by ensuring uniform and appropriate temperature distribution in different regions.
3Strength
If a rear handle is added to the PET bottle, then sealing performance and bottle body firmness improve, but the handle requires separate production and installation equipment and is prone to falling off
Solution Approach 1:
The handle and bottle body are merged into a single integrated structure through one-step injection molding. The injection mold includes a handle cavity that forms the handle as an integral part of the bottle body during the same manufacturing process, eliminating the need for separate handle production and installation equipment while preventing handle detachment.
4Ease of manufacture
If the handle part is not heated sufficiently, then the bottle body can be blown successfully, but the handle does not attach to the mold wall and deforms
Solution Approach 1:
The heating assemblies are controlled based on feedback from temperature sensors positioned at different locations in the mold cavity. The control system adjusts heating power to maintain optimal temperatures: ensuring the handle part reaches sufficient temperature for proper attachment while preventing the bottle body from becoming too soft, thus maintaining both processability and precision.
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 improves blowing quality, prevents wrinkles and handle displacement, simplifies production, reduces costs, and maintains the structural integrity of PET bottles with self-contained handles.
Implementation Method 1
a first heating assembly and a second heating assembly are respectively positioned at a handle part and a bottle body part in the bottle blowing mold; the first heating assembly is used to heat the preform at the handle part, and the second heating assembly is used to heat the preform at the bottle body part
Implementation Method 2
the preform at the bottle body part pushes the handle part to the inner wall of the mold under the action of compressed air
Data Source
AI summary
Provided are a bottle blowing mold, a bottle blowing machine and a plastic bottle, the bottle blowing mold includes a mold cavity, where a bottle body, a bottle shoulder, a handle and a bottle neck are formed within the mold cavity after a bottle preform is blown, the bottle shoulder is located between the bottle body and the bottle neck, one end of the handle is connected to the bottle shoulder, an other end of the handle is connected to the bottle shoulder or the bottle neck, and a cavity wall of the mold cavity is provided with at least one first rib to have a non-closed or annularly closed first groove is formed on the bottle body.