Fibrous Network Structure Having Excellent Compression Durability

Abstract

The present invention provides a network structure having excellent repeated compression durability, the network structure having a low repeated compression residual strain and a high hardness retention after repeated compression.A network structure comprising a three-dimensional random loop bonded structure obtained by forming random loops with curling treatment of a continuous linear structure including a polyester-based thermoplastic elastomer and having a fineness of not less than 100 dtex and not more than 60000 dtex, and by making each loop mutually contact in a molten state, wherein the network structure has an apparent density of 0.005 g / cm3 to 0.20 g / cm3, a 50%-constant displacement repeated compression residual strain of not more than 15%, and a 50%-compression hardness retention of not less than 85% after 50%-constant displacement repeated compression.

Description

TECHNICAL FIELD[0001]The present invention relates to a network structure suitable for cushioning materials that are used for office chairs, furniture, sofas, beddings such as beds, and seats for vehicles such as those for trains, automobiles, two-wheeled vehicles, buggies and child seats, and floor mats and mats for impact absorption such as members for prevention of collision and nipping, etc., the network structure having excellent repeated compression durability.BACKGROUND ART[0002]At present, foamed-crosslinking type urethanes are widely used a cushioning material that is used for furniture, beddings such as beds, and seats for vehicles such as those for trains, automobiles and two-wheeled vehicles.[0003]Although foamed-crosslinking type urethanes have excellent durability as a cushioning material, they have inferior moisture and water permeability and air permeability, and have thermal storage property to exhibit possible humid feeling. Since the foamed-crosslinking type ureth...

AI Technical Summary

Benefits of technology

The network structure of the patent is designed to withstand repeated compression and maintain its hardness and durability even after use. This makes it suitable for use as cushioning materials for office chairs, furniture, sofas, beddings and seats for vehicles, as well as floor mats for impact absorption. The excellent repeated compression durability has also led to its application in other fields such as protective gear for sports and leisure activities.

Problems solved by technology

Although foamed-crosslinking type urethanes have excellent durability as a cushioning material, they have inferior moisture and water permeability and air permeability, and have thermal storage property to exhibit possible humid feeling.

Since the foamed-crosslinking type urethanes do not have thermoplasticity, they have difficulty in recycling, and therefore they give significant damage to incinerators in case of incineration, and need high costs in elimination of poisonous gas.

For this reason, the foamed-crosslinking type urethanes are often disposed of by landfill, but limitation of landfill spots based on difficulty of stabilization of ground causes problems of the necessity for higher costs.

Furthermore, although the foamed-crosslinking type urethanes have excellent workability, they may cause various problems such as pollution problems with chemicals that have been used in the manufacturing process, residual chemicals after foaming and associated offensive odors.

However, in regard to the conventional network structures, it is difficult to obtain a network structure having durability performance which satisfies both the requirements of low repeated compression residual strain and high hardness retention after repeated compression.

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