PET Lipstick Case Assembly via Ultrasonic Welding
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Solution Overview
Problem
Conventional lipstick cases are difficult to assemble, have limited color options due to material constraints, and are made from non-recyclable, chemically unstable plastics that generate formaldehyde during manufacturing, leading to high production costs and environmental concerns.
Innovation Solution
A lipstick case composed entirely of polyethylene terephthalate (PET) with a simplified design featuring a cap, rotation tube, ascending and descending tube, support tube, and lower exterior casing, which are assembled using fewer components and ultrasonic waves, allowing for easy disassembly and recycling, reducing manufacturing costs and environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple components (casing, rotation body, carrier, cap, lower exterior case) are used in conventional lipstick cases, then the structure can achieve functional requirements, but the assembly becomes difficult and device complexity increases
Solution Approach 1:
The patent integrates multiple conventional components (casing, rotation body, carrier, cap, lower exterior case) into a unified structure where the rotation tube serves as both the rotation body and structural casing element, and the support tube integrates carrier functions. This merging reduces the number of separate parts while maintaining all necessary functions, directly resolving the contradiction between functional reliability and assembly complexity.
2Strength
If POM and ABS resin are used in conventional lipstick cases, then the materials provide structural properties, but the color options are limited and manufacturing cost increases due to dyeing requirements
Solution Approach 1:
The patent changes the material parameter from conventional POM/ABS resins to PET resin, which inherently provides both the required structural properties and color versatility. PET can be produced in various colors directly during manufacturing without additional dyes, eliminating the cost and complexity associated with dyeing POM and ABS while maintaining structural integrity.
3Strength
If POM and ABS resin are used in conventional lipstick cases, then the materials provide structural properties, but the chemical resistance is poor and formaldehyde is generated during manufacturing
Solution Approach 1:
The patent changes the material parameter from POM/ABS resins to PET resin, which has superior chemical resistance and does not generate formaldehyde during manufacturing. This material substitution eliminates the harmful factors while maintaining the structural properties needed for lipstick case functionality.
4Ease of manufacture
If different materials are used and assembled by ultrasonic waves in conventional lipstick cases, then the components can be joined, but disassembly and recycling become difficult
Solution Approach 1:
The patent applies homogeneity by using PET resin for all components (rotation tube, support tube, cap, casing) throughout the product. This uniform material composition enables easy disassembly and recycling, as all parts can be processed together without the complications of separating different plastic types, directly resolving the contradiction between assembly ease and recyclability.
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 PET-based lipstick case is recyclable, reduces manufacturing costs, increases production efficiency by 50%, eliminates formaldehyde emissions, and allows for a wide range of color options without additional dyes, while enhancing chemical resistance and assembly simplicity.
Implementation Method 1
assembled using fewer components and ultrasonic waves
Data Source
AI summary
An environmentally friendly lipstick case formed of PET includes a cap including an internal annular groove on a bottom; a rotation tube including internal spiral guide grooves; an ascending and descending tube including two opposite guide pins on an outer surface, and longitudinal ribs on an inner surface; a support tube including two opposite longitudinal tunnels on a surface, each longitudinal tunnel having an upper horizontal end and a lower horizontal end oriented in a direction opposite to that of the upper horizontal end, and an annular toothed member on a bottom of an inner surface; and a lower exterior casing including an annular shoulder on an outer surface of an upper portion, projections between the annular shoulder and an open top, and a protrusion on a blind bottom disposed in the toothed member. The guide pins are moveably disposed through the longitudinal tunnels into the guide grooves.