Refill Case Sealing Structure for Liquid Cosmetics

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Solution Overview

Problem

Conventional cosmetic compacts with refill cases have poor sealing, leading to leakage and inefficiency in accommodating liquid cosmetics, as they rely on porous pads that require time-consuming impregnation and result in wasted product.

Innovation Solution

A refill case with an improved sealing structure that directly accommodates liquid cosmetics without a pad, featuring a mesh fabric cover, sponge, and auxiliary mesh fabric, along with a rotatable case cover and elastomer sealing, to prevent leakage and accommodate various viscosities.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If a porous pad is used to accommodate liquid cosmetic, then the cosmetic can be impregnated and stored, but the amount of cosmetic that can be accommodated is limited and waste occurs when not completely consumed

Engineering Contradiction:

Improveamount of liquid cosmetic accommodatedVSAvoidwaste of cosmetic

Core Design Contradiction:

Quantity of substanceVSLoss of substance

Solution Approach 1:

The invention extracts and removes the porous pad from the refill case structure. Instead of using a pad to hold the cosmetic, the cosmetic is directly accommodated in the refill case cavity, eliminating the intermediary absorption material and maximizing the available storage space.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention uses a flexible sealing ring (elastomer) to create a seal between the refill case and the case body. This thin film structure provides effective sealing without occupying significant space, enabling direct cosmetic accommodation while preventing leakage.

Inventive Principle:

Principle #30Flexible shells and thin films

2Volume of stationary object

If liquid cosmetic is directly stored in refill case without pad, then storage space is maximized, but sealing performance is poor and leakage occurs

Engineering Contradiction:

Improveaccommodation space volumeVSAvoidsealing performance

Core Design Contradiction:

Volume of stationary objectVSReliability

Solution Approach 1:

A flexible sealing ring made of elastomer is introduced to create an effective seal between the refill case and the case body. The flexibility of the elastomer allows it to conform to the mating surfaces and maintain reliable sealing under various conditions.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The refill case structure combines different materials with complementary properties: the refill case body provides structural support and accommodation space, while the elastomer sealing ring provides flexible sealing. This composite approach achieves both large storage volume and reliable leak prevention.

Inventive Principle:

Principle #40Composite materials

3Quantity of substance

If porous pad is used for cosmetic impregnation, then cosmetic can be contained, but productivity is lowered due to time-consuming impregnation process

Engineering Contradiction:

Improvecosmetic containmentVSAvoidimpregnation process efficiency

Core Design Contradiction:

Quantity of substanceVSProductivity

Solution Approach 1:

The porous pad and its associated impregnation process are completely removed from the system. The cosmetic is directly filled into the refill case in liquid form, eliminating the time-consuming impregnation step and significantly improving production efficiency.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The cosmetic is pre-filled into the refill case in its liquid state during the manufacturing process, before use. This preliminary action eliminates the need for subsequent impregnation steps and allows for quick replacement of the entire refill unit when cosmetic is depleted.

Inventive Principle:

Principle #10Preliminary action

4Ease of manufacture

If conventional sealing structure is used, then manufacturing is simple, but leakage prevention is insufficient for liquid cosmetics

Engineering Contradiction:

Improvesealing structure simplicityVSAvoidleakage prevention

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

A flexible elastomer sealing ring is used to provide reliable leakage prevention. The simple ring geometry maintains ease of manufacture, while the elastomer material properties ensure effective sealing against liquid cosmetic leakage.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The sealing system combines the rigid refill case structure with a flexible elastomer sealing ring. This composite approach maintains manufacturing simplicity while achieving superior leakage prevention compared to conventional single-material sealing structures.

Inventive Principle:

Principle #40Composite materials

Data Source

PatentUS10925373B2Refill case for cosmetic compact

Publication Date: 2021.02.23 NEWFRONTECH

AI summary

Disclosed is a refill case detachably accommodated in a cosmetic compact, the refill case including: a main body being configured such that an upper portion thereof is open, and including an inner wall providing an accommodation space in the main body, and an outer wall provided at an outer side of the main body with a predetermined gap between the inner wall and the outer wall; and a mesh fabric cover including a cylindrical vertical extension portion tightly inserted in the gap, a rim portion extending from an upper end of the vertical extension portion in an inward direction, and a mesh fabric configured such that upper and lower surfaces thereof are interposed between the upper end of the vertical extension portion and an outer edge the rim portion along an edge thereof to be integrally provided, thereby covering an upper portion of the accommodation space.