Laminated Polyolefin Bedding Covers for Washable Allergen Barriers
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Solution Overview
Problem
Conventional protective covers for bedding elements are either too expensive, prone to shrinkage, or not durable enough for repeated use, and often fail to effectively block allergens like dust mites and insects.
Innovation Solution
A laminated polyolefin fabric (LPF) is used to create protective covers that are durable, resistant to shrinkage, and effective in blocking dust, dust mites, and insects, with a layered structure of nonwoven polyolefin fabric and polyolefin film, allowing for multiple wash and dry cycles without significant degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If disposable thermal plastic covers are used, then allergen barrier function is provided, but comfort and noise performance deteriorate
Solution Approach 1:
The patent uses a composite fabric structure combining polyester base fabric with polyethylene film coating. This composite material provides the allergen barrier function of disposable covers while maintaining the comfort and breathability of woven fabric, eliminating the noise and discomfort issues of pure thermal plastic covers.
Solution Approach 2:
The polyethylene film coating on the polyester fabric creates a thin film barrier that blocks allergens while allowing the fabric to remain flexible and comfortable. This thin film approach provides protection without the rigidity and noise of thicker disposable plastic covers.
2Reliability
If disposable protective covers are used, then allergen protection is achieved, but long-term cost increases due to frequent replacement
Solution Approach 1:
The patent creates a reusable alternative to disposable covers by using washable synthetic fabric with film coating. This material provides comparable allergen protection to disposable covers but can be laundered and reused multiple times, eliminating the need for frequent replacement and reducing long-term costs.
Solution Approach 2:
The invention changes the durability parameter of protective covers by using synthetic polyester and polyethylene materials that resist degradation during washing. This allows the cover to maintain its protective function through multiple wash cycles, transforming it from a single-use to a reusable product.
3Reliability
If finely woven fabrics are used, then allergen barrier function is improved, but cost increases and shrinkage occurs after washing
Solution Approach 1:
The patent changes the material composition from natural fibers (cotton) to synthetic fibers (polyester with polyethylene coating). This parameter change provides equivalent or superior allergen barrier function while eliminating shrinkage, as synthetic materials do not absorb water and expand/contract like natural fibers during washing.
Solution Approach 2:
The combination of polyester fabric with polyethylene film coating creates a composite material that provides excellent allergen blocking capability. The film layer creates a physical barrier to allergens while the polyester base provides dimensional stability and shrinkage resistance during laundering.
4Ease of manufacture
If conventional fabrics are used for protective covers, then manufacturing cost is reduced, but durability and allergen blocking effectiveness deteriorate
Solution Approach 1:
The patent applies a thin polyethylene film coating to the polyester fabric. This thin film provides effective allergen blocking capability at low cost, creating a barrier that conventional uncoated fabrics cannot provide while maintaining affordability and ease of manufacture.
Solution Approach 2:
The composite structure of polyester fabric plus polyethylene coating provides superior allergen blocking compared to conventional single-material fabrics. The combination leverages the low cost and durability of polyester with the effective barrier properties of polyethylene film, achieving both affordability and reliability.
Data Source
AI summary
Protective covers for pillows and mattress are wholly or partly made of layered polyolefin fabrics. The layered polyolefin fabrics used for the protective covers are sheets of material bonded together with an adhesive or other bonding methods. One of the layers of the laminated fabric is a nonwoven polyolefin fabric and another layer is a polyolefin film. The protective covers stop migration of dust mites and are also reusable. The covers are cleaned and sanitized using a washer and a dryer.