Blow Molding Sidewall Casing with Connecting Lip
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Solution Overview
Problem
Conventional methods for manufacturing portable restroom sidewalls are inefficient, as each blow molding process produces only one sidewall, resulting in higher production costs and weight due to the need for multiple individual hollow casing members.
Innovation Solution
A method combining blow molding and cutting processes to create a hollow casing member with a framed base and connecting lip, allowing for simultaneous production of two sidewalls, reducing weight and production costs by facilitating easier cutting and installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional blow molding process is used to manufacture sidewalls, then each process produces only one sidewall, but this results in low production performance and high cost
Solution Approach 1:
The mold is divided into multiple cavities (first cavity and second cavity) that can simultaneously produce multiple sidewalls in one blow molding cycle. Each cavity is independently formed and can be opened separately, allowing parallel production of multiple sidewalls to increase productivity
Solution Approach 2:
Multiple blowing processes are merged into a single integrated process where the formation device can sequentially or simultaneously inflate plastic material in multiple cavities. The connecting lip design allows the mold to function as a unified system producing multiple sidewalls with integrated base structures
2Weight of moving object
If individual hollow casing members are used for each sidewall, then each portable restroom requires three separate sidewalls, but this increases the overall weight
Solution Approach 1:
The connecting lip is designed with thinner thickness specifically for cutting, allowing the single molded piece to be easily segmented into multiple sidewalls after production. This segmentation reduces material usage while maintaining structural integrity of individual sidewalls
Solution Approach 2:
The single hollow casing member with multiple bases serves multiple functions: it acts as one structural unit during production and transport, then can be divided into multiple individual sidewalls for installation. The engaging flanges on each base provide universal mounting capability for different sidewall configurations
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
This method increases production efficiency, reduces material usage, and decreases the weight of portable restrooms by enabling the simultaneous manufacture of two sidewalls per process, while simplifying the cutting and installation of sidewalls.
Implementation Method 1
a formation device melts a plastic material and places the melted plastic material into a mold
Implementation Method 2
the formation device inflates the plastic material through the blowing tube such that the plastic material expands to conform with a shape of the cavity
Data Source
AI summary
A formation device melts a plastic material and places the melted plastic material into a mold. The mold has an upper case, a lower case and a cavity, and a blowing aperture is disposed at a conjunction area of the upper and lower cases and extending to the cavity. The formation device utilizes a blowing tube to connect to the blowing aperture to reach into the plastic material in the cavity. During a blow molding process, the formation device inflates the plastic material through the blowing tube such that the plastic material expands to conform with a shape of the cavity, and when the mold is opened, a hollow casing member is obtained. The casing member further comprises a framed base, and two opposite sides of the base respectively connected to a top board and a bottom board via a connecting lip.