Stretchable Laminate with Olefin Resin Layer for Low Gloss
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing stretchable laminates for sanitary articles like diapers and masks tend to have high glossiness, making them appear wet, and suffer from blocking issues when rolled, making it difficult to rewind them.
Innovation Solution
A stretchable laminate comprising an elastomer layer and an olefin-based resin layer on at least one side of the elastomer layer, with a 60° gloss value of 5 or less, a non-elastomeric olefin-based resin content of 70 wt% to 100 wt%, and a thickness of 10 µm to 100 µm, which is formed by pre-extension to enhance elastic performance and reduce glossiness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If layers each formed of a resin having an elastomeric property are laminated to create a stretchable laminate, then the laminate achieves stretchability and elastic performance, but blocking easily occurs between the layers when the laminate is rolled, making it difficult to rewind
Solution Approach 1:
The laminate is divided into multiple functional layers with distinct properties: an elastomer layer for stretchability, an olefin-based resin layer for blocking resistance, and optionally a barrier layer. This segmentation allows each layer to perform its specific function without interfering with others, solving the contradiction between elastic performance and blocking resistance.
Solution Approach 2:
The invention uses composite material structure combining different resin types (elastomer and olefin-based resin) with complementary properties. The elastomer layer provides stretchability while the olefin-based resin layer provides low glossiness and blocking resistance, achieving both elastic performance and ease of handling when rolled.
2Illumination intensity
If the laminate surface has high glossiness, then the appearance is bright and clean, but the articles appear to be wet which is not preferred for sanitary articles
Solution Approach 1:
The invention controls the optical properties of the laminate surface by using an olefin-based resin layer with specific characteristics that reduce glossiness. This creates a matte or low-gloss appearance that prevents the wet look while maintaining a clean and bright appearance suitable for sanitary articles.
3Ease of operation
If the olefin-based resin layer contains high content of non-elastomeric olefin-based resin (70 wt% to 100 wt%), then blocking resistance and low glossiness are improved, but the elastic performance of the laminate may be reduced
Solution Approach 1:
The laminate structure separates the elastomeric function (in the elastomer layer) from the surface property function (in the olefin-based resin layer). This allows the olefin-based resin layer to have high content of non-elastomeric resin for blocking resistance without compromising the elastic performance provided by the dedicated elastomer layer.
Solution Approach 2:
The composite structure combines an elastomer layer for stretchability with an olefin-based resin layer for blocking resistance and low glossiness. The high content of non-elastomeric olefin-based resin (70-100 wt%) in the olefin layer achieves excellent blocking resistance while the elastomer layer maintains the overall elastic performance of the laminate.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Provided is a stretchable laminate that is excellent in low glossiness and is also excellent in blocking resistance. Also provided is an article including such stretchable laminate. The stretchable laminate of the present invention includes : an elastomer layer; and an olefin-based resin layer arranged on at least one side of the elastomer layer, in which the stretchable laminate has a 60° gloss value of 10 or less.