Two-Layer HDPE LDPE Packaging for Oil-Based Cosmetics
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Solution Overview
Problem
Conventional cosmetic packaging materials, such as HDPE and PP, are inflexible and prone to oil absorption, leading to swelling and label blurriness, making them unsuitable for oil-based products without additional protective coatings, which are costly and difficult to recycle.
Innovation Solution
A cosmetic preparation with oils liquid at 20°C and a spreading value of less than 550 mm/10 min, packaged in a two-layer HDPE, LDPE, or PP container, where the inner layer is made of the same polymer as the outer layer and combined with 1-propene-ethylene copolymer, reducing oil absorption and maintaining packaging stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional packaging materials (HDPE, PP) are used, then the packaging is affordable and environmentally friendly, but the material is stiff and inflexible, making it difficult to remove products and empty the packaging completely
Solution Approach 1:
The packaging is divided into two functional layers: an inner layer made of conventional HDPE/PP for chemical stability and an outer layer made of softer plastic (LDPE, LLDPE, or PP blend) for flexibility and ease of product removal. This segmentation allows each layer to fulfill its specific function without compromise.
Solution Approach 2:
The packaging combines two different plastic materials with complementary properties: the inner layer provides oil resistance and chemical stability, while the outer layer provides flexibility and soft touch feel. This composite structure resolves the contradiction between stiffness and flexibility.
2Strength
If soft plastic tubes are used, then the packaging is flexible and has soft-touch feel, but the plastic absorbs oil components, causing swelling and label blurriness
Solution Approach 1:
The packaging is divided into two functional layers: an inner layer made of conventional HDPE/PP for chemical stability and an outer layer made of softer plastic (LDPE, LLDPE, or PP blend) for flexibility and soft touch feel. This segmentation allows each layer to fulfill its specific function without compromise.
Solution Approach 2:
The inner layer acts as an intermediary barrier between the cosmetic preparation and the outer soft plastic layer. It prevents direct contact between the oil-based product and the oil-absorbing outer layer, thereby preventing swelling and maintaining packaging stability.
3Reliability
If protective barriers (ethylene vinyl alcohol) are applied to prevent oil absorption, then the packaging stability is improved, but the cost increases and recyclability decreases
Solution Approach 1:
The invention uses conventional, inexpensive plastic materials (HDPE, PP, LDPE, LLDPE) that are already widely used and recyclable, replacing the need for expensive specialty coatings like ethylene vinyl alcohol. The solution achieves protection through material selection rather than costly additives.
Solution Approach 2:
The packaging combines two different plastic materials with complementary properties: the inner layer provides oil resistance and chemical stability, while the outer layer provides flexibility and soft touch feel. This composite structure resolves the contradiction between stiffness and flexibility.
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 solution provides a flexible, shelf-stable packaging system for oil-based cosmetics that prevents oil absorption and label blurriness without the need for expensive protective coatings, ensuring effective product storage and ease of use.
Implementation Method 1
the inner layer facing the preparation is formed of HDPE, LDPE or PP, while the outer layer is formed of a mixture of HDPE, LDPE or PP and in combination with 1-propene-ethylene copolymer
Data Source
AI summary
The invention relates to a cosmetic made of a) a cosmetic preparation which contains one or more oils liquid at 20°C and having a spreadability value of less than 550 mm/10 min and b) a package consisting of HDPE, LDPE or PP combined with a 1-propene-ethylene copolymer.