JPH0226975A - Solid cotton - Google Patents

Abstract

PURPOSE:To obtain a solid cotton having excellent flame-retardancy, heat- resistance and cushioning property by mixing aromatic polyamide short fibers with polyphenylene sulfide short fibers and bonding the fibers with each other by melting the polyphenylene sulfide short fibers. CONSTITUTION:Aromatic polyamide short fibers 1 are mixed with preferably 1-30wt.% of polyphenylene sulfide short fibers and the mixture is heated at a temperature higher than the melting point of the polyphenylene sulfide short fiber and lower than the melting point of the aromatic polyamide short fiber to form the bonding points 3, 4, 5 between the fibers by the melting of the polyphenylene sulfide short fibers and obtain the objective solid cotton especially suitable as a cushioning material of aircraft seat, wadding of a coverlet for a foot warmer, etc.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention can be used as a cushion material for beds and chairs, batting and core materials for futons, batting for clothing, etc., and can be used as a covering material for civil engineering work, etc. It is a structure in which the fibers are piled up in a plate shape and the misalignment between the fibers is restrained by the bonding points, and can be used for non-flammable applications such as aircraft seats where flame retardancy is particularly required. The present invention relates to firm cotton that is suitably used for cushioning materials, battings for kotatsu futons, battings for heat-shielding protective clothing, etc.

[Conventional technology]

It is made of a mixture of high-melting point polyester staple fibers and low-melting point polyester staple fibers, and is used as a solid cotton for cushioning materials such as beds, batting and core materials for bedding and clothing. Stiff cottons are known which bond the contact points, thereby improving cushioning and preventing fiber separation.

On the other hand, aircraft seats use urethane foam for the cushioning material, and since W flame resistance is particularly required, the upholstery fabric is made of flame-retardant fabric, and in order to protect the flammability of the urethane foam, flame-retardant fabric is used. Polyurethane foam is used, or urethane foam is coated with a non-flammable or flame-retardant flexible material.

[Problem to be solved by the invention]

The above-mentioned hard cotton made of polyester fibers is flammable unless the polyester fibers contain a flame retardant or have been treated with flame retardant treatment, and when used as batting for kotatsu or heat-shielding clothing, they tend to weaken due to heat. There was a problem in that the thickness decreased and the heat retention and heat shielding properties deteriorated. Furthermore, when used as a cushioning material for aircraft seats, there is a problem in that, like urethane foam, it must be covered with a non-flammable or flame-retardant flexible material.

The present invention has been made to solve the above-mentioned problems, and is flame retardant, has excellent heat resistance, is resistant to fading even when used as filling for kotatsu futons and thermal clothing, and is suitable for cushioning materials for aircraft seats. The purpose of the present invention is to provide a firm cotton that can be used without being coated with a non-flammable or flame-retardant flexible material when used for.

[Means to solve the problem]

, the present invention relates to aromatic polyamide (hereinafter referred to as APA)
short fibers and polyvinylene sulfide (hereinafter referred to as pps
It consists of a mixture of short fibers of polyphenylene sulfide fibers, and is characterized by bonding between the fibers due to melting of polyphenylene sulfide fibers.

The APA short fibers used in the present invention are fibers with a repeating monotonous fineness and fiber length, and the PPS short fibers are fibers with a suitable fineness and fiber length of a polymer in which 90% or more of the repeating units are ÷03÷. The appropriate fineness and fiber length of the short fibers are those suitable for use as stiff cotton and for obtaining a mixed web of both short fibers by carding or land univer.

That is, for example, for filling for futons, the fineness is 6 to 30 de and the fiber length is from about 20 m to about 100 m, and for the filling for clothing, the fineness is 0.5 to 6 de, 20 m5.
Fiber lengths from about +100 to about 100, for cushioning materials such as beds and seats, from about 10 de to 300.
A fiber having a fineness of up to about de and a fiber length of about 40 to 1501 is preferably used.

The hardened cotton of the present invention is produced by converting both staple fibers as described above into a 10/90 to 90/10
Preferably, PPS short fibers are mixed in a weight proportion of 10 to 50% by weight, particularly preferably 10 to 30% by weight, and in the case of a carded web, the web is further mixed with a crosslayer or the like to an appropriate thickness. Stack them so that
The web obtained by those methods is appropriately compressed, and PPS
It is obtained by creating a bond between 1 am and 1 am in the melting of the PPS fibers by heating at a temperature above the melting point of the fibers and below the melting point of the APA fibers. In addition, PPS
When the fiber content exceeds 50% by weight, the heating conditions that create bonds between the fibers to prevent them from becoming flattened become difficult.
In the range of 30% by weight, there is little settling even if the PPS fibers are sufficiently melted, so the range of heating conditions is wide.

[For production]

Since the firm cotton of the present invention has bonding between the fibers due to the melting of the PPS fibers, it not only restrains the misalignment between the fibers and improves the cushioning properties, but also the bond between the PA fibers and the PPS fibers.
The fiber has excellent heat resistance and is extremely flame retardant, so when used in the filling of kotatsu futons and thermal clothing, it does not easily deteriorate.
When used as a cushioning material for aircraft seats, it shows the ability to be used directly under the upholstery fabric without being coated with a non-flammable or flame-retardant flexible material.

〔Example〕

Hereinafter, the present invention will be explained by examples.

Example 1゜6de, 75m meta-aramid fiber and dde,
After blending 75 mm PPS fibers at a weight ratio of 50:50, they are passed through a card to form a web, and the web that comes out of the card is folded back and layered using a crosslayer, and the resulting layered web is further layered in several layers. A laminated web is obtained, and this laminated web is compressed between pressure plates in which ventilation holes are distributed, and the temperature between the ventilation holes and the pressure plate is approximately 300°C (the melting point of PPS fiber is approximately 285°C, the melting point of meta-aramid fiber is 320°C). By passing hot air (at a temperature of 15°C or higher), bonds are formed between the fibers as shown in the schematic diagrams in Figures 1 and 2.The basis weight is approximately 500 g/aa'', and the free thickness is approximately 3CI+. A solid cotton was obtained.

1 [6 and Fig. 2, ■ is meta-aramid fiber, 2 is PPS fiber, 3 and 4.5 are bonding points by melting of PPS fibers, 3 is bonding point of PPS fiber 2, 4 is meta-aramid fiber The bonding point between fiber 1 and PPS fiber 2,
5 is PPS at the contact crossing part of the first meta-aramid fiber.
This is the bonding point created by the complete melting of the fibers.

When the obtained solid cotton was used as the filling for a kotatsu futon, it did not deteriorate as much as when using solid cotton made of polyester fibers of the same degree of fineness. Since this filling has self-extinguishing properties, it will not cause a fire.

Example Z 70de, 150 am meta-aramid fiber and 50d
e. After blending 150% PPS fibers in a weight ratio of 80:20, forming a web using a land univer,
This web was heat treated in the same manner as in Example 1. As a result, the bonds between the fibers as shown in Figure 1 are mainly
As shown in the figure, the joints are partially exposed and the weight is approximately 15.
00g/m" and a free thickness of approximately 4C1m. This solid cotton was used as cushioning material for beds and seats.
When used directly under the facing fabric, it showed excellent cushioning properties and durability. This cushion material is also self-extinguishing, so it will not cause a fire.

〔Effect of the invention〕

The firm cotton of the present invention has self-extinguishing properties and does not cause a fire, and when used in the filling of kotatsu futons and thermal clothing, it easily flattens out, and when used in cushioning materials for beds and seats. It exhibits durability and good cushioning properties, and has the excellent effect of being able to be used as an aircraft cushioning material without being coated with a non-flammable or flame-retardant flexible material.

[Brief explanation of the drawing]

FIGS. 1 and 2 are partial diagrams schematically showing the m-fiber lBl bond of the firm cotton of the present invention. l... Meta-aramid fiber, 2... PPS fiber, 3.
4.5...Connection point.

Claims (1)

[Claims] A hard cotton consisting of a mixture of aromatic polyamide short fibers and polyphenylene sulfide short fibers, and characterized in that bonds are formed between the fibers by melting the polyphenylene sulfide fibers.