JPH03234889A - Glass fiber sheet - Google Patents

Abstract

PURPOSE:To provide the subject sheet containing glass fibers and mycelia produced by mold, exhibiting sufficiently high strength by the use of only a small amount of binder, having high and uniform paper strength and useful as a filtering material for air-filter, printed circuit board, backer for flooring material, etc. CONSTITUTION:The objective sheet contains glass fibers and preferably 1-30wt.% of mycelia produced by mold.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a glass fiber sheet used for applications such as filter paper for air filters, sheets for printed circuit boards, and flooring materials.

[Prior art]

Glass fiber sheets are used in a wide range of fields, including clean room air filters and building air conditioning air filters used in the semiconductor industry, medical product manufacturing industry, food industry, hospitals, etc., as well as printed circuit boards and flooring backers. There is. These glass fiber sheets are mainly made of glass fibers, and are made by mixing synthetic fibers, natural fibers, and inorganic fibers as necessary.

The glass fibers used here have different fiber diameters and fiber lengths depending on the purpose. For example, clean room air filters include HEPA filters (ultra high performance air filters) and medium performance air filters. The former uses relatively fine glass fibers with a fiber diameter of 0.1 to ]-μm, and the latter uses relatively thick glass fibers with a fiber diameter of 1 to 15 μm. Fiber diameters of 5 to 15 μm are mainly used for printed circuit boards or flooring backers, and if necessary, synthetic fibers and natural fibers are appropriately mixed to change the porosity of the sheet and improve the adhesion of the impregnated resin. Control the amount and permeability of vinyl chloride sol.

When forming these sheets, the above fibers alone do not have the ability to self-adhere, so in order to obtain strength as a sheet,
A binder is required. As a binder, a synthetic resin emulsion such as acrylic, urethane, epoxy, styrene-butadiene, vinyl chloride, or ethylene-vinyl acetate is added to an aqueous slurry of glass fibers to make mixed paper (internal addition method). Alternatively, after forming the paper layer, it can be applied by spraying or impregnating. There is also a method of mixing hot water-soluble fibrous polyvinyl alcohol.
These binders are appropriately selected or used in combination depending on the required performance.

The performance requirements for glass fiber sheets used for air filters, flooring backers, printed circuit boards, etc. are different, but the common performance requirements for these sheets are high strength with a low binder content. If the amount of binder is increased in order to obtain a high-strength glass fiber sheet, a large amount of binder film is formed between the fibers, which impairs the properties of the glass fiber sheet, such as deterioration of air permeability or impregnation properties.

JP-A-64-13789 exemplifies a printed wiring board sheet using bacterial cellulose produced by microorganisms. Bacterial cellulose can be used to form sheets, but the disadvantages of bacterial cellulose are that it has low freeness and has strong cohesiveness, resulting in poor formation.

Bacterial cellulose is produced by culturing bacterial cells and using substances produced outside the bacterial cells, whereas examples of using bacterial cells themselves in sheets include Japanese Patent Publication No. 10240/1983 and British Publication Patent No. 2165865. Publication No. 1 is mentioned.

The former c. only describes the use of pulp and synthetic pulp as a filler by mixing filamentous fungi, but there is no mention of binders for functional sheets.

The latter actively washes filamentous fungi with alkali and removes chitin.
By exposing chitosan and taking advantage of the characteristics of chitin and chitosan itself, the paper describes its use as non-woven fabrics for injuries and illnesses and as ion exchangers. Here, attention is paid to making use of the characteristics of chitin and chitosan, and there is no description of a method for using filamentous fungi as a binder without washing them with alkaline.

As described above, there is limited knowledge regarding the use of filamentous fungi as binders for other fibers.

On the other hand, in the internal addition method of resin-impregnated emulsion, an emulsion is added to an aqueous slurry of glass fibers, an aqueous solution of a polyvalent metal salt or an aqueous cationic polymer solution is added, and the emulsion is coagulated and deposited on the surface of the glass fibers. A paper-making method or a method in which a synthetic resin emulsion is preliminarily aggregated with a polyvalent metal salt to an average particle size of 50 to 300 μm, and this is mixed with an aqueous slurry of glass fibers to make paper. Since only the resin aggregates attached to the paper contribute to paper strength, it is necessary to add a large amount of binder to obtain the necessary paper strength. For this reason, the air permeability of the obtained sheet is significantly impaired. Furthermore, glass fibers have a smooth surface, and therefore, during papermaking, the aggregates easily separate from the glass fiber surface, flow out of the papermaking wire, or cause clogging of the papermaking wire.

In order to apply a synthetic resin emulsion by spraying or impregnation, special equipment is required in addition to normal papermaking equipment.

In other words, the sheet formed on the paper machine wire barely maintains its shape due to the surface tension of the water, and in order to apply a binder to it, the wet sheet must be transferred to a wire, etc. After holding it in and spraying or impregnating it with a binder,
The strength of the glass fiber sheet can only be obtained by drying it as is. Therefore, the process is complicated and the production speed is slow. Further, this method also requires a large amount of binder.

In the case of mixing hot water-soluble fibrous polyvinyl alcohol as a binder, if the wet paper moisture is not sufficient, the polyvinyl alcohol fibers will not melt during drying, and sheet strength will not be obtained. In the case of fine glass fibers with a fiber diameter of 1 μm or less, sufficient paper strength can be obtained with the above binder because a large amount of water can be retained between the fiber networks.
Glass fibers with a fiber diameter of several micrometers or more do not have the moisture retention ability of wet paper, so it is difficult to obtain a sheet with strong paper strength. In addition, sheets obtained using the fibrous polyvinyl alcohol binder are dense and dense, making them unsuitable for filters that require bulky sheets.

Furthermore, in the manufacturing process, there is a problem in that during the process of transferring the wire from part of the paper machine wire to the felt, and then transferring it to the drying section, the glass fibers are taken up by the felt and difficult to cut because there is no bond between the glass fibers.

[Problem to be solved by the invention]

The present invention solves the above-mentioned conventional problems, and provides a glass fiber sheet that can be easily produced in a normal papermaking process, has a low binder content, and has high sheet strength.

[Means to solve the problem]

The present inventors conducted extensive research to solve the above problems. As a result, they discovered that by using mycelium produced by filamentous fungi as a binder for glass fibers, a high-strength sheet could be obtained with a very small amount of binder, and the present invention was completed.

That is, the present invention is a glass fiber sheet containing glass fibers and mycelium.

The above-mentioned glass fiber sheet can be used for filter paper for air filters, sheets for printed circuit boards, flooring materials, etc.

The present invention will be explained in detail below.

As the glass fibers used in the present invention, ultrafine glass fibers with a fiber diameter of 4 μm or less and chopped strand glass fibers with a fiber diameter of 5 to 20 μm can be used alone or in combination.

Bacterial cellulose uses cellulosic substances produced outside the bacterial cells by culturing bacteria, whereas the mycelium produced by the filamentous fungi used in the present invention is produced by the bacterial cells themselves growing into a fibrous form. It is different from bacterial cellulose because it uses what has become, that is, the bacterial cells themselves. This bacterial cellulose can also be used to form glass fiber sheets, but the mycelium of the present invention has better texture than those using bacterial cellulose, and the sheet is flexible, making it easier to wind. Better in good things, etc.

The mycelium produced by filamentous fungi used in the present invention refers to molds (Aspergillus sp., Rhizopus sp., Fusarium sp., Zaprolegnia sp., Mucor sp., Diplobuia sp., Cercospora sp., Trichothecium sp., Penicillium sp., Trichoderma sp., Neurospora sp. Botrytis spp., Trichutiaton spp., Teuthomium spp., Endothea spp., etc.), yeasts (Candida spp., etc.), actinobacteria (Streptomyces spp., etc.), bacteria (Mycobacterium spp., etc.).

Refers to all mycelium-like organisms, such as basidiomycetes (Heterobasis genus, Laetiborus genus, Tyromyces genus, etc.), algae (Photolibuium genus, Sperulina genus), etc.

A medium suitable for each mycelium containing organic and inorganic nutrients (for example, YM medium in the case of mold) is used. At this time, the concentration of organic nutrients in the medium should be 1/10 to 1/1 of the normal concentration.
/ 100 is also possible and is economically superior. Stirring may cause the mycelium to harden into balls, so
Gentle stirring or standing conditions are desirable, but if there is no risk of beads forming, shaking may be performed to promote growth. The temperature is 5 to 95°C, and the period is 1 day to 90 days.

The mycelium obtained by culturing can be used as is, but mycelium contains various components such as proteins, nucleic acids, lipids, and inorganic salts in addition to polysaccharides such as cellulose and chitin. They can also be removed by appropriate treatment. For example, proteins can be removed by immersion in an alkaline aqueous solution, lipids in an organic solvent, and inorganic salts in an acid solution. In addition, the mycelium may be colored, but this can be decolored by the above-mentioned treatment or bleaching, depending on the purpose. Normally, the mycelium of the present invention can be treated using ordinary pulp purification processes, such as alkaline treatment and bleaching treatment.

The mycelium thus obtained is well entangled with the glass fibers, and the wet paper formed on the wire of the paper machine is strong, so it is easy to transfer to the next process, and it It can be efficiently produced using papermaking equipment (nu). Another feature is that by mixing mycelium, the slurry can be better dispersed, so a uniform sheet can be easily obtained.

In order to further improve the dispersion of the glass fibers in water, a surfactant, an aqueous solution of polymeric polyacrylamide, etc. may be added. Further, an antifoaming agent may be added to prevent the formation of pinholes due to air bubbles.

The sheet is obtained by uniformly dispersing and mixing the above-mentioned glass fibers and mycelium in water, making paper using a conventional wet paper machine, and drying the paper.

The amount of mycelium is 1 to 30% by weight, preferably 5 to 20% by weight, based on the sea 1-ffi melon. If the mycelium is less than 1% by weight, the sheet strength will be weak, and if it is more than 30% by weight, the amount of glass fiber will be reduced, which is not preferable.

In addition, mixing glass fibers and mycelium is not limited to after the mycelium is prepared; glass fibers can be added to the culture medium as needed.
A composite of glass fibers and mycelium may be prepared during culturing.

Furthermore, synthetic fibers, recycled fibers, natural fibers, or inorganic fibers can be mixed into the glass fiber sheet 1 as required. Examples of synthetic fibers include polyester fibers, polyamide fibers, polyvinyl alcohol fibers, polyolefin fibers, and polyacrylonitrile fibers. Examples of recycled fibers include rayon fibers and cupro fibers. Examples of natural fibers include water valves, hemp pulp, cotton pulp, and the like. Examples of inorganic fibers include ceramic fibers, rock wool fibers, sepiolite, and the like. The above various fibers can be mixed and dispersed in an aqueous slurry of glass fibers and mycelium, and a glass fiber sheet is formed by paper-making this slurry. Furthermore, it is also possible to mix inorganic fuel and make paper.

If necessary, the glass fiber sheet may be treated to be water repellent by spraying, coating, impregnating and drying with a water repellent. Alternatively, paper may be made by mixing a sizing agent with the slurry. Furthermore, in order to suppress fuzzing of the glass fibers on the surface, a synthetic resin emulsion may be sprayed or impregnated and dried.

[For production]

The glass fiber sheet of the present invention is a sheet with a low binder content and high strength, which is obtained by using mycelium as a binder in glass fibers.

Therefore, it is easy to handle and can be used as a filter medium for air filters.
Effective as base paper for printed circuit boards, flooring material, etc.

〔Example〕

EXAMPLES The present invention will be specifically described below with reference to Examples, but the present invention is not limited to these Examples.

In the examples, all parts and percentages are by weight.

Mycelium was prepared as follows.

The following two types of culture media were used.

(Medium I) Yeast extract 0.3g, malt extract 1-0.3g, polypeptone 0.5g,
Glucose 1. Og, tap water] 1. Og1] 2 pH was adjusted to 7.0.

(Medium ■) Yeast extract 3g1 Malt extract 3g1 Polypeptone 5g1 Glucose 10g1
20 g of agar, 1.0 g of tap water, and the pH was adjusted to 7.0.

A mold (Aspergillus oryzae ATCC 15240) was precultured on medium ① at 30°C for 3 days. The precultured mold was suspended in physiological saline. absorbance 2.53
(600 nm), and this was inoculated to medium I at a rate of 2%. 30 by magnetic star sea
The cells were cultured at 30° C. for 2 days with gentle rotation at rpm.

After culturing, the mycelium produced from the culture solution was washed with a sufficient amount of water while being suction-filtered. This mycelium was used in Examples 1 to 4 below.

(Examples 1 to 3) Ultrafine glass fiber (manufactured by John Manville Co., Ltd., C0DE106
, fiber diameter 0.54 to 0.6 g, czm (hereinafter referred to as glass fiber (A)) was added to water and dispersed using an Sv type reciprocating stirrer (manufactured by Takasaki Seisakusho, Agitator). The mycelium was added and mixed while stirring with an agitator. At this time, the mixing ratio of glass fiber (A) and mycelium when paper-making the sheet was 9515.90/10.80.
Three levels were prepared so that the ratio was /20. Next, water was added to the slurry to dilute each to 0.1%, and the dry weight was 75g/r.
The rf sheet was made into paper using a rectangular hand-paper machine (wire mesh 80 meshes, wire mesh size 25 cm x 250 inches), then pressed and dried to obtain a glass fiber sheet. The obtained sheet was coated with a 1% water-soluble water repellent (manufactured by Ciba Geigy, Fobotex FT).
I (EPA
A filter medium for a filter was obtained.

(Example 4) Chopped strand glass fiber (manufactured by Asahi Fiber Glass Co., Ltd., fiber diameter 9 μm, fiber length 6 mm; hereinafter referred to as glass fiber (B)) was added to water, adjusted to a concentration of 0.5%, and dispersed in an agitator. did. The previously prepared mycelium was added to the slurry so that the ratio of glass fiber (B) to mycelium was 9515, water was further added, the concentration was adjusted to 0.2%, and the slurry was uniformly dispersed in an agitator. A sheet with a dry weight of 40 g/ryf was made and transferred from wire to felt (wet paper state).

Next, ultrafine glass fiber (manufactured by John Manville, C0D
E108B, fiber diameter 1 μm = Glass fiber (C)) 1
Add 0 parts and 90 parts of glass fiber (B) to water, 0.5%
After adjusting the concentration, it was dispersed in an agitator. The previously prepared mycelium was mixed with the slurry so that the ratio of glass fibers (glass fibers (B) and glass fibers (C)) to mycelium was 9515, and water was added to make the concentration 0.2%. The mixture was adjusted and dispersed uniformly in an agitator, and a sheet having a dry weight of 35 g/rrf was made.

Next, on top of the wet paper on the wire, the wet paper made of 9 μm glass fibers of 40g/r+f, which had been transferred to the felt earlier, was overlapped with the felt, and the wet paper on the wire was transferred to the felt, pressed, and dried. , 35 g/rr? and 40
75g/r consisting of two layers of glass fiber sheets of g/rrr
A laminated glass fiber sheet of rr was obtained.

5 The obtained sheet was subjected to water repellent treatment in the same manner as in Examples 1 to 3 to obtain a medium-performance air filter medium.

(Comparative Example 1) 95 parts of glass fiber (A) was added to water, adjusted to a concentration of 0.5%, dispersed in an agitator, and added to the slurry with hot water-soluble polyvinyl alcohol fibers (manufactured by Kuraray Co., Ltd., VPB105,
Add 5 parts of fiber diameter 2 denier, fiber length 3 mm), add water to make a 0.2% mixed slurry, and after uniformly dispersing it, glass with a dry weight of 75 g/rrr was prepared in the same manner as in Examples 1 to 3. A fiber sheet was prepared and subjected to water repellent treatment to obtain I (filter medium for EPA filter).

The above results are shown in Table 1. Measurement items are basis weight, thickness,
These are tensile strength, pressure drop, and collection efficiency.

In addition, pressure loss (mmH20) and collection efficiency are JIs
Measurement was made using Type 1 of B-9908 at a wind speed of 5.3 cm/sec. Also, a measurement beam for collection efficiency.

P aerosol (dioctyl phthalate, particle size 0.3 μm
).

]-6 Table 1 *GF Niglass fiber PVA fiber: Hot water soluble polyvinyl alcohol fiber (Example 5) Mycelium was prepared as follows.

The following two types of culture media were used.

(Medium ■) Tap water was added to 39 g of potato dextrose agar medium (manufactured by Eiken Kagaku Co., Ltd.) and 5 g of agar, and the pH was adjusted to 5.6 (using hydrochloric acid and caustic soda).The whole was filled up to 1ρ. Dispense each 150mΩ into a roof flask,
Sterilization was performed by autoclaving at 120°C for 20 minutes.

(Medium ■) 3g yeast extract, 3g malt extract (manufactured by Difco), 5g polypeptone
(manufactured by Daigo Nutrition Co., Ltd.), add tap water to 20g of glucose,
(Hydrochloric acid and caustic soda were used to adjust the pH to 7.0) The whole was filled up to 1Ω. 1.5Ω of the culture medium was dispensed into a 3g capacity Kolben and sterilized by autoclaving at 120°C for 20 minutes.

A mold (Fusarium socini) was cultured on medium ■ at 28°C for 3 days. After culturing, 30 ml of physiological saline was added to each roux to thoroughly suspend the grown mold cells. The suspension was permeated through sterilized cotton, and the resulting spore suspension was dispensed into 1 mg portions, stored at -80°C, and dissolved and used as needed. Add 1 spore suspension to medium ■
Inoculated at a rate of 1 mg/g and incubated at 28°C for 2 days at 80°C.
Incubation was performed at one stroke/min. The culture solution was filtered using a 200-mesh sieve and washed repeatedly with pure water. Using this mycelium, a glass fiber sheet was obtained in the same manner as in Example 3, and subjected to the same water repellent treatment to obtain a complete filter medium for HEPA filters.

(Example 6) Mycelium was prepared as follows.

Two types of media were used: medium (■) and medium (■).

A fungus (Deipropuia natalensis) was cultured on medium ■ at 28°C for 3 days. After culturing, physiological saline was added to thoroughly suspend the grown fungal hyphae, and the resulting suspension was inoculated into medium (2) and cultured at 28° C. for 2 days at 80 strokes/min. The inoculation rate was one slant per Ω.

9 The culture solution was filtered using a 200-mesh sieve, and the filter was washed repeatedly with pure water. Using this mycelium, a glass fiber sheet was obtained in the same manner as in Example 3, and subjected to the same water repellent treatment to obtain a complete filter medium for HEPA filters.

(Examples 7 to 16) In the same manner as in Example 6, mold (Cercospora oryzae) (Example 7), mold (Trichothecium roseum)
(Example 8), mold (Mucor leuxianus, IF
0577B) (Example 9), Mold (Penicillium citrinum, ATCC 9849) (Example 10), Mold (Trichoderma reesei, ATCC 117109) (Example 11), Mold (Neurospora crassa, ATCC 3)
6373) (Example 2), Mold (Botrytis cinerei CB5241.62) (Example 13), Mold (Trichocyton mentagrophytes, 1FO752)
2) (Example 14), mold (Chaetminum anahericinum, NHL2390) (Example 5), mold (Endosia barasite 0 squid, CB5114.13) (Example 16),
Hereinafter, mycelium was prepared according to Example 6 to obtain a glass fiber sheet.

Table 2 shows the measurement results of the physical properties of the sheets obtained in Examples 5 to 16. The items are the same as in Examples 1-4.

1 2 23 (Example 17) Mycelium was prepared as follows.

As the culture medium, two types of compositions were used: medium ① and medium V below.

(Medium ■) 3 g of yeast extract, 3 g of malt extract, 5 g of polypeptone, 20 g of glucose, 12 g of glass fiber (A), 1 g of tap water, O, Q, pH adjusted to 7.0. 3. 1.5g of culture medium. The mixture was dispensed into a 1/2-inch volume container and sterilized by autoclaving at 120°C for 20 minutes.

Mold (Aspergillus spp.
oryzae, ATCC 15240) was precultured. The precultured mold was suspended in physiological saline.

The absorbance is 2. 53 (600 nm), and this was inoculated into medium V at a rate of 2%. The mixture was cultured at 30° C. for 2 days using a magnetic cooler with gentle rotation at 30 rpm to obtain a glass fiber-mycelium complex in which mycelium was bound to glass fibers. The glass fiber-mycelium was washed with water on a 200 mesh sieve. about,
Add 1000 times (weight) of water to the composite and make sheets with a dry weight of 70 g/r& with each type of hand paper machine (80 wire meshes, wire mesh size 25 x 25 cm),
Press drying was performed to obtain a glass fiber sheet.

Even when glass fiber was added from the beginning, there was no problem with the mold culture and treatment process, and the mold mycelium showed the same excellent binder effect.

(Examples 18 to 20) Glass fibers (B) were added to water, adjusted to a concentration of 0.5%, dispersed in an agitator, and the previously prepared mycelium was added and mixed while stirring in an agitator. At this time, the ratio of glass fiber to mycelium was changed to 9515.90/10.80/20. Next, add water to the above slurry to make each slurry 0.
．． Dilute to 2%, press and dry after paper making, basis weight 50g
A glass fiber sheet of /ryf was obtained.

(Comparative Example 2) An amount equivalent to 10 g of bone dry weight of the mycelium prepared above was collected and steam sterilized with 2% NaOH at 120° C. for 20 minutes. After the treatment, it was washed, and the absolute dry weight was determined to be 2.5 g.

Glass fibers (B) were dispersed in the same manner as in Examples 18 to 20, and the above mycelium treated with NaOH was mixed. At this time, the mixing ratio of glass fiber and mycelium was adjusted to 90/10, and the same method as in Examples 18 to 20 was used to reduce the basis weight to 50.
A glass fiber sheet of g/ryf was obtained.

The physical properties of the glass fiber sheets of Examples 18 to 20 and Comparative Example 2 are shown in Table 3. Measurement items are basis weight, density, tensile strength,
The air permeability is measured according to JIS L-1096.
Measured using a Frazier type tester.

(Example 21) Epoxy resin (
manufactured by Yuka Shell Co., Ltd., Epicor) 1001) 100 parts, dicyandiamide 6 parts, benzyldimethylamine 0.4 part,
An epoxy resin face consisting of 67 parts of methyl ethyl ketone was impregnated to obtain an impregnated sheet. All sheets were excellent in impregnability and handling workability.

After air-drying the impregnated sheet, dry it at 120℃ for 10 minutes, and stack 4 impregnated and dried sheets at 170℃, 20kgr/c+
Hot pressure molding was carried out for 30 minutes to obtain a printed circuit board sheet. When the volume resistivity was measured, Examples 18 to 20
In the order of 1.2X10151.5X10151.0XIO
It showed good electrical properties of 15 Ω'Cm. Furthermore, no bumps or warping of the sheet was observed.

(Example 22) Polyvinyl chloride sol was applied to a release paper, the glass fiber sheets of Examples 18 to 20 were placed thereon, and polyvinyl chloride was further applied and dried to obtain an impregnated sheet. It has excellent permeability and workability for polyvinyl chloride, making it suitable as a sandwich-type flooring material.

(Example 23) Glass fiber (manufactured by Unitika, fiber diameter 6 μm, fiber length 6 m)
m: 30 parts of glass fiber (D) below, glass fiber (B)
30 parts, polyester fiber (manufactured by Tijin, fineness 0.5
Denier, fiber length 3mm) 6 10 parts, unbeaten softwood bleached pulp (NBKP, C3F6
After adding 10 parts of 75 ml) to water, 20 parts of mycelium was added while stirring with an agitator, and water was added to obtain a 0.2% mixed slurry. After uniformly dispersing the slurry, Example 1
A glass fiber sheet was obtained in the same manner as in 3. Display the results,
Shown in 3.

7 8 9 This sheet was excellent in strength and handleability for use as a backer for flooring materials.

As is clear from Table 1, the filter of the present invention exhibits high strength with a low binder, low pressure loss, and high collection efficiency.

From Table 2, it can be seen that the mycelium constituting the filter of the present invention as a binder is not limited to any genus, and the excellent binder effect can be applied to all mycelial organisms in general.

It can be seen from Tables 3 and 3 that the sheet of the present invention exhibits high strength with a low binder and is excellent in handling and processability as a flooring material.

Although the amount of mycelium used as a binder was four times the amount of mycelium related to the present invention due to treatment with NaOH, considering the time of mycelium production, the sheet strength did not change. There wasn't.

〔Effect of the invention〕

The glass fiber sheet of the present invention consists of glass fibers and mycelium produced by filamentous fungi. It has sufficient strength with a small amount of binder. It is also possible to mix synthetic fibers, natural fibers, and inorganic fibers as necessary.

The glass fiber sheet has a homogeneous and high strength paper strength required for air filter media, printed circuit boards, flooring backers, etc., and glass fiber sheets of various diameters are widely used in ordinary paper making methods. It has advantages such as easy paper making.

Claims (2)

[Claims] (1) A glass fiber sheet containing glass fibers and mycelium produced by filamentous fungi. (2) The glass fiber sheet according to claim (1), which contains mycelium in a range of 1% to 30% by weight.