Blow-Molding Mold With Raised Neck Step for Wrinkle Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing PET bottles with self-contained handles face issues such as incomplete sealing, damage to the bottle body, and quality defects like wrinkles at the connection of the bottle shoulder and neck due to the handle, which are not addressed by conventional bottle blowing processes.
Innovation Solution
A blow-molding mold with a mold cavity design featuring a raised step structure on the bottle neck, first and second ribs with grooves on the shoulder and body, and a concave region for the handle, which prevents wrinkles and ensures proper positioning during the bottle blowing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a bottle preform with a self-contained handle is blown using a conventional mold, then the bottle can be produced, but wrinkles are easily formed at the connection of the bottle shoulder and bottle neck, causing quality defects
Solution Approach 1:
The mold cavity is divided into multiple functional regions: a first concave region for accommodating the handle, a second concave region for accommodating the bottle shoulder, and a third concave region for accommodating the bottle neck. This segmentation allows each region to be optimized independently, preventing wrinkles at the shoulder-neck connection while maintaining handle formation capability.
Solution Approach 2:
Different regions of the mold cavity are designed with different local characteristics tailored to the specific requirements of each bottle component. The first concave region provides localized support for the handle, the second concave region shapes the bottle shoulder, and the third concave region forms the bottle neck, ensuring optimal surface quality at each location.
2Shape
If the handle part of the bottle preform is only transversely stretched without longitudinal stretching, then the handle position and shape are maintained, but the bottle preform heating process becomes complex and the handle part may overheat and deform
Solution Approach 1:
The mold design incorporates specific geometric parameters and configurations that enable proper heat distribution and material flow during the blowing process. The concave regions are designed with specific dimensions and positions that control the heating and stretching parameters, allowing the handle to be formed correctly without requiring complex separate heating procedures.
3Reliability
If a two-step bottle blowing process is used to produce PET bottles with self-contained handles, then the bottles have good sealing performance and firm structure, but the production time and process complexity increase
Solution Approach 1:
The mold design integrates multiple functions into a single blow-molding operation. The same mold cavity that forms the bottle body also simultaneously forms the self-contained handle through its specialized concave regions. This merging of functions eliminates the need for separate handle attachment steps, reducing production time while maintaining the structural integrity and sealing performance of the two-step process.
Solution Approach 2:
The handle is pre-formed as an integrated part of the bottle preform during the injection molding stage, and the blow-molding mold is pre-configured with the necessary concave regions to accommodate and finalize the handle shape during the blowing process. This preliminary preparation eliminates the need for post-production handle attachment, reducing both time and complexity.
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 mold design enhances the structural strength and prevents wrinkles, ensuring high-quality production of PET bottles with self-contained handles, improving sealing and reducing the risk of handle detachment.
Implementation Method 1
the mold cavity includes a first concave region to have a raised step structure formed on the bottle neck
Implementation Method 2
a blow-molding 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
Implementation Method 3
a cavity wall of the mold cavity is provided with at least one first rib to have a first groove formed on the bottle shoulder
Data Source
AI summary
Provided are a blow-molding mold, a bottle blowing machine and a plastic bottle, the blow-molding mold has 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, the other end of the handle is connected to the bottle shoulder or the bottle neck, and the mold cavity includes a first concave region to have a raised step structure formed on the bottle neck.