Lipstick Dispenser Vacuum Nesting for Deformation Control
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Solution Overview
Problem
Conventional methods for attaching lipstick sticks to dispensers either deform the soft paste end or result in positional irregularity of the hard paste sticks, and existing solutions like air injection are not universally effective.
Innovation Solution
A method using negative pressure created by a vacuum pump to guide the lipstick stick into the dispenser receptacle, reducing the force required for insertion and ensuring precise alignment, which can be applied to both soft and hard paste sticks, and includes a machine design with a molding station and vacuum system for efficient assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If pressure is exerted on the lip-application end to nest soft paste lipstick inside the cup, then the lipstick is attached to the dispenser, but the contoured end is deformed
Solution Approach 1:
Instead of pushing the lipstick stick into the cup using positive pressure from the outside, the invention applies negative pressure (vacuum) from inside the cup to draw the stick in. This reverses the direction of the nesting force, eliminating deformation of the fragile contoured end while achieving secure attachment.
Solution Approach 2:
The invention replaces the traditional mechanical pushing system with a vacuum-based system. A vacuum pump creates negative pressure within the cup, substituting direct mechanical contact and force application with a pressure differential that gently draws the lipstick in without deforming its surface.
2Ease of manufacture
If compressed air is injected to propel the stick to its nested position, then hard paste lipstick is attached, but positional regularity is poor
Solution Approach 1:
The invention inverts the approach by using suction instead of propulsion. The vacuum pressure uniformly draws the lipstick stick into the cup from all directions, ensuring consistent positioning and alignment, whereas compressed air injection from a single direction causes variability in final position.
3Strength
If stronger nesting force is applied to ensure secure attachment, then the lipstick is firmly attached, but soft paste and fragile contoured ends are deformed
Solution Approach 1:
The invention replaces direct mechanical pushing force with vacuum suction. The negative pressure distributes the nesting force uniformly across the lipstick stick, achieving secure attachment without concentrating stress on the fragile contoured end, thus maintaining both attachment strength and shape integrity.
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 allows for the secure and precise attachment of lipstick sticks with reduced deformation risk for soft pastes and improved positional regularity for hard pastes, enabling the use of softer and more fragile cosmetic formulations while preventing scratches during assembly.
Implementation Method 1
a nesting step in which the stick is nested in the receptacle due to negative pressure created within the receptacle by a vacuum pump
Data Source
AI summary
The invention relates to a method for attaching lipstick to a lipstick dispenser and to a corresponding machine. The method for attaching lipstick to a dispenser, wherein the dispenser includes a distal end for the lips, and the dispenser includes a receptacle having an insertion opening fitted to a proximal end of the stick. The method includes: a moving step in which the insertion opening and the proximal end of the stick are moved adjacent to one another so as to substantially block the insertion opening; and a nesting step in which the stick is nested in the receptacle via a recess formed in the receptacle.