Halogen-Free Packing Sheet with High Water Vapor Barrier
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Solution Overview
Problem
Conventional packing sheets for foods and pharmaceuticals face challenges with poor moisture-proof properties and high costs, particularly due to the use of polyvinyl chloride and polyvinylidene chloride resins, which are environmentally unfriendly, and the need for improved water vapor barrier properties in polypropylene sheets.
Innovation Solution
A packing sheet composed of high-density polyethylene resin, petroleum resin, and amorphous polyolefin resin, with specific weight blending ratios and molecular weight ranges, that excludes halogen materials like chlorine and fluorine, enhancing water vapor barrier properties and moldability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyvinyl chloride resin and polyvinylidene chloride resin are used for packing sheets, then moisture-proof property is improved, but cost increases and environmental harm occurs due to chlorine-containing gas generation
Solution Approach 1:
The invention extracts and removes halogen-containing materials (polyvinyl chloride resin and polyvinylidene chloride resin) from the packing sheet composition entirely, replacing them with halogen-free polyolefin resins. This extraction eliminates the source of chlorine-containing harmful gases while maintaining the moisture-proof function through alternative material selection.
Solution Approach 2:
The invention changes the material composition parameters by specifying precise resin combinations (polyethylene resin A, polypropylene resin B, and/or polybutene resin C) with controlled weight ratios. This parameter change transitions from halogen-containing to halogen-free materials while achieving comparable or improved moisture barrier properties through optimized compositional parameters.
2Ease of manufacture
If polypropylene sheet is used to reduce cost and improve ease of treatment, then cost decreases and ease of operation improves, but water vapor barrier property becomes insufficient
Solution Approach 1:
The invention creates a composite material system combining multiple polyolefin resins (polyethylene A, polypropylene B, and/or polybutene C) with petroleum resin. This composite approach leverages the complementary strengths of each component: polyethylene provides excellent barrier properties, polypropylene offers ease of processing, and petroleum resin enhances adhesion and moisture resistance, achieving both good processability and superior water vapor barrier performance.
Solution Approach 2:
The invention optimizes the water vapor barrier property by carefully controlling the weight ratios of components (polyethylene A: 10-60 parts, polypropylene B: 10-60 parts, polybutene C: 10-60 parts, petroleum resin: 5-30 parts). This parameter optimization ensures sufficient moisture barrier performance while maintaining the cost-effectiveness and ease of processing inherent to polypropylene-based compositions.
3Reliability
If high-density polyethylene resin is used to improve water vapor barrier property, then water vapor barrier property is improved, but transparency and moldability deteriorate
Solution Approach 1:
The invention creates a balanced composite material system where high-density polyethylene resin A (providing superior water vapor barrier properties) is combined with polypropylene resin B (offering good moldability and transparency) and petroleum resin (enhancing overall performance). This composite formulation achieves a balance where the barrier properties of polyethylene are maximized while the processing characteristics of polypropylene and petroleum resin ensure adequate moldability and transparency.
Solution Approach 2:
The invention controls the weight ratio of polyethylene resin A within 10-60 parts relative to other components, preventing excessive polyethylene content that would severely compromise moldability and transparency. This parameter control allows the system to achieve high water vapor barrier properties through optimized composition rather than relying solely on high polyethylene content, thereby maintaining acceptable processing characteristics.
Data Source
AI summary
The present invention provides a packing sheet and PTP packing body, which do not include halogen materials such as chlorine and fluorine and have high water vapor barrier property. The packing sheet of the present invention includes at least a high-density polyethylene resin (A), petroleum resin (B), and amorphous polyolefin resin (C). Also, it is preferable that the weight blending ratio ((A+B)/C) of the total weight of the high-density polyethylene (A) and the petroleum resin (B) to the weight of the amorphous polyolefin (C) be 50/50 or more and 90/10 or less.