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Nonwoven fabric for press molding, method for producing same, and method for producing molded article

A technology of press molding and manufacturing method, which is applied in the fields of non-woven fabrics for press molding and their manufacture and the manufacture of molded bodies

Inactive Publication Date: 2014-07-23
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The object of the present invention is to solve the problem about the pressure moldability of the three-dimensional molded body using the nonwoven fabric containing polylactic acid fiber and natural fiber

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • Nonwoven fabric for press molding, method for producing same, and method for producing molded article
  • Nonwoven fabric for press molding, method for producing same, and method for producing molded article
  • Nonwoven fabric for press molding, method for producing same, and method for producing molded article

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0226] Polylactic acid fragments (melting point 170°C, weight average molecular weight 11.3×10 4 ), 1% by mass of carbon black with a median diameter d50 of 20 nm as a crystal nucleating agent, and triglycidyl isocyanurate (manufactured by Nissan Chemical Industry Co., Ltd. "TEPIC" (registered trademark. The following The same)) 2% by mass was put into the hopper of the spinning machine, melt-spun at a spinning temperature of 230°C using an extrusion-type spinning machine, cooled the spun filaments, applied an oil agent and bundled them, and then spun at a temperature of 1000 m / min draw to get unstretched wire.

[0227] The resulting undrawn yarns were bundled to form 800,000 dtex, stretched to 4.0 times in a liquid bath at 90°C, and then mechanically crimped with a stuffer box, heated at 145°C for 10 minutes, and then sprayed to give a relative crimp. Using 0.5% by weight of the oil agent in the fiber, the fiber was cut to 51 mm to obtain polylactic acid short fibers with a...

Embodiment 2

[0232] Using a roller carding machine, the same polylactic acid staple fiber and South African kenaf fiber as in Example 1 were mixed and opened at a mass ratio of 50:50 to make a web. Then, at a needle density of 60 / cm 2 Acupuncture and interweaving are carried out under certain conditions to obtain a weight per unit area of ​​556g / m 2 , Non-woven fabric with a thickness of 3.6mm. Regarding this nonwoven fabric, the tensile strength in the longitudinal direction is 128 N / cm 2 , the transverse tensile strength is 84N / cm 2 , The longitudinal tensile stress of 30% tensile elongation in 200°C atmosphere is 19N / cm 2 , the transverse tensile stress is 16N / cm 2 . In addition, the cooling crystallization temperature of the polylactic acid fiber in the nonwoven fabric was 127°C. In addition, the fiber length frequency distribution of South African kenaf fibers having a fiber length of 45 mm or more in the nonwoven fabric was 87%, and the interweaving of polylactic acid fibers an...

Embodiment 3

[0235] Using a roller carding machine, the same polylactic acid staple fiber and South African kenaf fiber as in Example 1 were mixed and opened at a mass ratio of 30:70 to make a web. Then, in the first acupuncture 80 / cm 2 , the second acupuncture 80 / cm 2 , The total needle density is 160 pcs / cm 2 Acupuncture and interweaving are carried out under certain conditions to obtain a weight per unit area of ​​514g / m 2 , Non-woven fabric with a thickness of 3.4mm. Regarding this nonwoven fabric, the tensile strength in the longitudinal direction is 58 N / cm 2 , the transverse tensile strength is 34N / cm 2 , The longitudinal tensile stress of 30% tensile elongation in 200°C atmosphere is 9N / cm 2 , the transverse tensile stress is 8N / cm 2 . In addition, the cooling crystallization temperature of the polylactic acid fiber in the nonwoven fabric was 127°C. In addition, the fiber length frequency distribution of kenaf fibers having a fiber length of 45 mm or more in the nonwoven fa...

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Abstract

Provided is a nonwoven fabric for press molding, and with the nonwoven fabric fiberboard-molding time is shorter and molded article quality is excellent, even in press three-dimensional molding, also provided is a molded article. The nonwoven fabric for press molding is a nonwoven fabric formed from polylactic acid fibers and natural fibers, and is characterized in that the melt crystallization temperature of polylactic acid fibers is 120 C or higher, the tensile strength of the nonwoven fabric is 20 N / cm2 or higher, and the nonwoven fabric tensile stress at 30% elongation in a 200 C atmosphere is 80 N / cm2 or less. The molded article uses the nonwoven fabric for press molding.

Description

technical field [0001] The present invention relates to a nonwoven fabric for press molding, a method for producing the same, and a method for producing a molded article using the nonwoven fabric. Background technique [0002] In recent years, environmental issues have been paid attention to in all fields. For example, in order to reduce deforestation, fiberboards made of short lignocellulosic fibers obtained from oil palm, coconut, and kenaf and thermosetting resins by heating and pressing have been proposed (Patent Document 1). [0003] In addition, in order to further reduce the environmental load, a fiber-based board has been proposed that mixes plant-derived polylactic acid resin and natural fibers, heats and pressurizes, and molds the overall apparent density within a specific range (Patent Document 2). [0004] Furthermore, as an improved invention of the invention of Patent Document 2, in order to shorten the molding time, a wooden molded article in which an inorga...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/435B29C43/02D04H1/425D04H1/46
CPCB29K2105/0818B29C43/02B29K2067/043D04H1/4266D04H1/485D04H1/55D04H1/558Y10T442/608Y10T442/698D04H1/46D04H1/435B29C43/003D04H1/425
Inventor 武田宽贵藤山友道梶山宏史
Owner TORAY IND INC
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