Threadless Blow Molding Device for Reducing Material Waste
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Solution Overview
Problem
Conventional plastic blow molding techniques require thread sections and annular protruded portions that are unnecessary for some products, leading to material waste and the need for additional polishing and milling to smooth sharp edges, complicating the manufacturing process.
Innovation Solution
A threadless plastic blow molding device with a recessed cavity and expanded portion for positioning a threadless blank, allowing for blow molding without the need for thread sections and annular protruded portions, using a main molding-base, bottom molding-base, and blow molding-base with gas blowing capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If conventional blow molding technique with thread section and annular protruded portion is used, then the blank can be positioned in the mold, but material waste is generated and additional polishing process is required
Solution Approach 1:
The invention extracts and eliminates the unnecessary thread section and annular protruded portion from the blank design. By removing these extraneous features that were traditionally required for positioning, the patent achieves threadless positioning through a simplified blank structure that directly engages with the mold's positioning features without generating material waste or requiring post-processing.
Solution Approach 2:
Instead of modifying the blank to include thread sections and protruded portions for positioning, the invention inverts the approach by providing positioning features directly in the mold structure. The mold includes a positioning cavity with a positioning protrusion that directly engages with the blank, eliminating the need for traditional threading on the blank itself.
2Manufacturing precision
If thread section and annular protruded portion are cut from products, then positioning is achieved, but sharp edges or corners are formed requiring additional polishing
Solution Approach 1:
The invention performs preliminary positioning action through the mold's positioning cavity and protrusion structure before the blow molding process completes. By pre-establishing the positioning geometry in the mold itself, the system ensures that the blank is correctly positioned and shaped without requiring subsequent cutting or polishing operations to remove sharp edges or corners.
3Ease of operation
If conventional positioning method is used, then the blank can be positioned in the mold, but the manufacturing process becomes complicated
Solution Approach 1:
The invention merges the positioning function directly into the mold structure by integrating the positioning cavity with positioning protrusion as an inherent part of the molding device. This consolidation eliminates the need for separate positioning mechanisms or components, achieving effective blank positioning while maintaining simple device architecture.
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
Enables efficient blow molding of threadless products, reducing material waste and simplifying the manufacturing process by firmly positioning the blank within the device for effective shaping without sharp edges or corners.
Implementation Method 1
the blank 6 can sustain the pressure generated by gas blowing from the gas blowing portion 52, thereby changing the shape of the blank 6
Data Source
AI summary
A threadless plastic blow molding device includes a main molding-base, a bottom molding-base, and a blow molding-base. The main molding-base has two mating portions each defines a recessed cavity. The recessed cavities correspond to each other when the mating portions are mated. The bottom molding-base and the blow molding-base are respectively assembled to two ends of the main molding-base. The blow molding-base has a gas blowing portion. The main molding-base, the bottom molding-base, and the blow molding-base collectively define a forming space for forming a blank. The blow molding-base has an expanded portion extended toward the mating portions. Each of the mating portions has a recessed section corresponding to the expanded portion. Accordingly, the blank can be positioned in the molding device.