CN112663398A - Flexible glass fiber paper and preparation method thereof - Google Patents
Flexible glass fiber paper and preparation method thereof Download PDFInfo
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- CN112663398A CN112663398A CN202011540931.2A CN202011540931A CN112663398A CN 112663398 A CN112663398 A CN 112663398A CN 202011540931 A CN202011540931 A CN 202011540931A CN 112663398 A CN112663398 A CN 112663398A
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- 239000003365 glass fiber Substances 0.000 title claims abstract description 112
- 238000002360 preparation method Methods 0.000 title claims abstract description 24
- 239000003292 glue Substances 0.000 claims abstract description 70
- 238000001035 drying Methods 0.000 claims abstract description 53
- 239000002270 dispersing agent Substances 0.000 claims abstract description 33
- 238000005507 spraying Methods 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000002002 slurry Substances 0.000 claims description 17
- 239000007787 solid Substances 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- 238000004513 sizing Methods 0.000 claims description 5
- 229920000604 Polyethylene Glycol 200 Polymers 0.000 claims description 4
- 235000021355 Stearic acid Nutrition 0.000 claims description 4
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 4
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 4
- 229940113115 polyethylene glycol 200 Drugs 0.000 claims description 4
- 239000008117 stearic acid Substances 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 210000004209 hair Anatomy 0.000 abstract description 14
- 230000008569 process Effects 0.000 abstract description 13
- 230000000149 penetrating effect Effects 0.000 abstract description 10
- 239000000463 material Substances 0.000 abstract description 7
- 239000011230 binding agent Substances 0.000 abstract description 6
- 239000002562 thickening agent Substances 0.000 abstract description 2
- 239000000835 fiber Substances 0.000 description 12
- 239000004372 Polyvinyl alcohol Substances 0.000 description 11
- 229920002451 polyvinyl alcohol Polymers 0.000 description 11
- 239000000853 adhesive Substances 0.000 description 9
- 230000001070 adhesive effect Effects 0.000 description 9
- 239000006185 dispersion Substances 0.000 description 8
- 239000008399 tap water Substances 0.000 description 8
- 235000020679 tap water Nutrition 0.000 description 8
- 238000005520 cutting process Methods 0.000 description 7
- 238000004537 pulping Methods 0.000 description 7
- 150000001875 compounds Chemical class 0.000 description 4
- 210000002268 wool Anatomy 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000011152 fibreglass Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 239000012855 volatile organic compound Substances 0.000 description 2
- 239000013543 active substance Substances 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007791 dehumidification Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- MTNDZQHUAFNZQY-UHFFFAOYSA-N imidazoline Chemical compound C1CN=CN1 MTNDZQHUAFNZQY-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
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Abstract
The invention discloses a flexible glass fiber paper and a preparation method thereof, wherein the preparation process comprises the processes of dispersing, forming, glue pouring and drying, so that the prepared glass fiber paper can meet the requirements of a runner framework material, wherein only a dispersing agent is added in the dispersing process, a thickening agent is not added, the glass fiber is effectively dispersed, the viscosity of white water is stabilized at 1-2cp, and then the viscosity of the white water is not required to be adjusted. According to the invention, special glue spraying equipment is selected in the glue spraying process, and the used binder is limited, so that the binder is uniformly distributed in the glass fiber paper by the glue spraying equipment, the problem of hair falling of the product is further solved, and the problem of hair standing is reduced by using a compact mesh belt in the forming process; in the preparation process, a penetrating drying mode is adopted in the drying process, the drying temperature and time are limited, the flexibility of the paper can be reduced when the temperature of the oven is too high, and the strength of the paper can be influenced when the temperature of the oven is too low or the drying time is too long.
Description
[ technical field ] A method for producing a semiconductor device
The invention belongs to the technical field of glass fiber, and particularly relates to flexible glass fiber paper and a preparation method thereof.
[ background of the invention ]
The flexible glass fiber paper is used for making VOC (volatile organic compound) adsorption rotating wheel, dehumidification rotating wheel and SCR (selective catalytic reduction) denitration honeycombIn order to maximize the effect of the frame material by having a large specific surface area, the frame material is made of corrugated glass fiber paper. The main component of the glass fiber paper is glass fiber, and the glass fiber has brittleness and stiffness, so that the glass fiber paper on the market can crack and rebound in the corrugating process, and cannot be molded; meanwhile, the phenomenon of' fluff on paper surface of the glass fiber paper in the market is serious (the number of glass fibers standing on the surface of the glass fiber paper reaches thousands of fibers/m)2) In addition, the surface of the fiberglass paper can also have a phenomenon of hair falling (i.e. the phenomenon of shedding of glass fibers in the processing process of the fiberglass paper).
[ summary of the invention ]
The invention aims to overcome the defects of the prior art and provide flexible glass fiber paper and a preparation method thereof, so as to solve the problems that the glass fiber paper prepared in the prior art is cracked and difficult to form in the corrugating process, and the surfaces of the glass fiber paper have the phenomena of hair standing and hair falling.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a preparation method of flexible glass fiber paper comprises the following steps:
step 1, adding glass fiber and a dispersant into water, and stirring to form slurry, wherein the concentration of the glass fiber in the slurry is 1% -5%, and the concentration of the dispersant is 0.02% -0.05%;
step 2, forming the slurry into glass fiber paper by wet forming;
step 3, spraying a layer of glue solution on the surface of the glass fiber paper, wherein the glue of the glue solution is PVA;
and 4, drying the glass fiber paper after glue spraying, wherein the drying temperature is 130-150 ℃, and the drying time is 15-20 s, so as to prepare the flexible glass fiber paper.
The invention is further improved in that:
preferably, in step 1, the length of the glass fiber is 6mm, the diameter of the glass fiber is 4.5 μm, and the oil content of the glass fiber is 0.2-0.35%.
Preferably, in step 1, polyethylene glycol-200 is added to the sizing agent used in the process of preparing the glass fiber.
Preferably, in the step 1, the pH value of the slurry is 6-7.
Preferably, in step 1, the solid content of the dispersant is 11%, and the dispersant is 1801 type stearic acid.
Preferably, in step 3, the concentration of the glue solution is 8% to 10%.
Preferably, in step 3, the sizing amount of the glue solution is 9% to 10%.
Preferably, in step 4, the drying manner is through drying.
The flexible glass fiber paper prepared by any one of the preparation methods has the dry longitudinal strength of more than or equal to 55N/5cm, the wet longitudinal strength of more than or equal to 30N/5cm and the gel content of 6-9%.
Preferably, the gram weight of the glass fiber paper is 23 +/-2 g/m2The density of the glass fiber paper is 180g/cm3。
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a preparation method of flexible glass fiber paper, which comprises the steps of dispersing, forming, glue pouring and drying, so that the prepared glass fiber paper can meet the requirements of a runner framework material, wherein only a dispersing agent is added in the dispersing process, a thickening agent is not added, the glass fiber is effectively dispersed, the viscosity of white water is stabilized at 1-2cp, and then the viscosity of the white water is not adjusted. According to the invention, special glue spraying equipment is selected in the glue spraying process, and the used binder is limited, so that the binder is uniformly distributed in the glass fiber paper by the glue spraying equipment, the problem of hair falling of the product is further solved, and the problem of hair standing is reduced by using a compact mesh belt in the forming process; in the preparation process, a penetrating drying mode is adopted in the drying process, the drying temperature and time are limited, the flexibility of the paper can be reduced when the temperature of the oven is too high, and the strength of the paper can be influenced when the temperature of the oven is too low or the drying time is too long.
The invention also discloses flexible glass fiber paper, the dry longitudinal strength of the fiber paper is more than or equal to 55N/5cm, the wet longitudinal strength of the fiber paper is more than or equal to 30N/5cm, the glue content of the fiber paper is 6-9%, the product has good flexibility, and the performance requirement of the fiber paper as a framework material of a rotating wheel is met. Compared with other products, the flexible glass fiber paper prepared by the invention has higher wet strength under the same gram weight and thickness and better folding resistance, and the good flexibility ensures that the paper is easy to be pressed into corrugated shape, thereby solving the difficult problem of processing the glass fiber paper into corrugated shape, avoiding the phenomenon of hair falling and reducing the generation of hair (the invention)<100 roots/m2) (ii) a In addition, the invention maximizes the micropore porosity of the glass fiber paper, and the pore size of the micropores is matched with the diameter of the material to be added later, so as to realize the maximum material addition amount, thereby enabling the product of the client to exert the maximum effect.
[ description of the drawings ]
FIG. 1 is a flow chart of the preparation method of the present invention.
[ detailed description ] embodiments
The invention is described in further detail below with reference to the accompanying drawings:
in the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and encompass, for example, both fixed and removable connections; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The preparation process of the invention has the following key process parts:
1. glass fiber and impregnating compound
The smaller the diameter of the general fiber is, the better the flexibility of the glass fiber yarn is, therefore, the invention selects the finest glass fiber in the current market, the diameter is 4.5 μm, the length of the glass fiber is selected to be 6mm, the dispersion effect of the fiber can be influenced by too long fiber, and the strength of the finished paper can be influenced by too short fiber.
In order to facilitate the drawing operation during the production of the glass fiber, the surface of the glass fiber is coated with a layer of impregnating compound, and polyethylene glycol-200 capable of increasing the flexibility of the fiber is added into the impregnating compound, so that the toughness of the glass fiber is maximized, and the oil content of the glass fiber is 0.2-0.35%. The impregnating compound comprises active substances, ethanol, polyethylene glycol-200 and imidazoline.
2. White water and dispersant
The white water used in the production line is tap water, a special dispersant, namely 1801 type stearic acid with long molecular chains is added into the water, and other components are not added, so that the content of organic matters in the water can be reduced, and the flexibility of the product can be improved.
3. Binder
In the invention, the thermoplastic adhesive polyvinyl alcohol (PVA) is selected as the adhesive, and the PVA is favorable for increasing the flexibility of the glass fiber paper.
4. Glue spraying equipment
In order to ensure that the adhesive in the middle of the glass fiber paper is uniformly distributed on the cross section of the glass fiber paper and the condition that the coating amounts of the adhesives on two sides are greatly different is avoided, the invention adopts special adhesive pouring equipment which is provided with an adhesive pouring inclined plane, the surface of the inclined plane is smooth and flat, the formed adhesive curtain is continuous, the adhesive breaking phenomenon is avoided, the uniform distribution of the adhesive in the glass fiber paper is ensured, and the thickness of the adhesive layer can be controlled by adjusting the angle of the inclined plane. If the binder is unevenly distributed in the middle of the glass fiber paper, the phenomenon of hair falling of the product can be caused, and the hair standing of the product can be increased. If the phenomena of hair falling and hair standing of the glass fiber paper are serious, the product quality of a client can be influenced, and the operation cost of the product of the client is greatly increased.
5. Oven equipment
The drying mode mainly adopts hot air to carry out penetrating type drying, and the drying temperature and the drying time are well controlled. Too high an oven temperature can reduce the flexibility of the paper, and too low an oven temperature or too long a drying time can affect the strength of the paper.
Referring to fig. 1, specifically, the preparation process of the glass fiber paper of the present invention specifically includes the following steps:
pulping: adding glass fiber and a dispersing agent into a slurry preparation tank, adding tap water for uniform dispersion, adjusting the concentration of slurry to be 1-5%, adjusting the pH to be 6-7, stirring for 5min, wherein the solid content of the dispersing agent is 11%, and the concentration is 0.02-0.05%. The dispersing agent is 1801 type stearic acid, the diameter of the glass fiber is 4.5 mu m, and the length of the glass fiber is 6 mm;
wet forming: and (3) feeding the slurry prepared in the step one into a forming step, and forming by using a net part device to obtain the glass fiber paper preliminarily, wherein a compact net belt is used in the forming process to reduce the problem of 'standing wool', and the specification of the net belt is 75 meshes.
③ drenching the glue: preparing a glue solution with the concentration of 8-10%, uniformly applying the glue solution to the surface of the glass fiber by using glue spraying equipment, wherein the glue is PVA, and the glue application amount is controlled to be 9-10%.
And fourthly, drying: and (4) carrying out penetrating drying treatment on the glass fiber paper after glue spraying in the step three by using an oven, wherein the drying temperature is 130-150 ℃, and the drying time is 15-20 s.
Cutting: and D, slitting the paper obtained in the step four according to different paper specification requirements of customers.
Comparison of product Performance indicators
The product indexes of the flexible glass fiber paper are as follows:
gram weight: 23 +/-2 g/m2
Dry longitudinal strength:
(N/5cm)≥55
wet longitudinal strength:
(N/5cm)≥30
gel content (%) 6-9
Product Density (g/cm)3)180
The product appearance is as follows: no damage, uniform fiber distribution, less standing wool on felt surface, no wool drop "
The folding endurance of the product is 70 times.
The product indexes of the conventional glass fiber paper are as follows:
gram weight: 25 +/-2 g/m2
Dry longitudinal strength:
(N/5cm)≥55
wet longitudinal strength:
(N/5cm)≥30
gel content (%) 13-15
Product Density (g/cm)3)120
The product appearance is as follows: no damage, uniform fiber distribution, more standing wool on the felt surface, and hair falling off from the felt surface "
The folding times of the product are 15 times.
Example 1
Pulping: adding glass fiber and a dispersing agent into a pulp preparation tank, adding tap water for uniform dispersion, adjusting the pulp concentration to 5 percent and the pH to 7, stirring for 5min, wherein the solid content of the dispersing agent is 11 percent, and the concentration of the added dispersing agent in the pulp is 0.02 percent.
Wet forming: and (4) feeding the prepared slurry obtained in the step one into a forming part, and forming by using a net part device to obtain the glass fiber paper preliminarily.
③ drenching the glue: preparing a glue solution with the concentration of 10%, uniformly applying the glue solution to the surface of the glass fiber by using glue spraying equipment, wherein the glue is PVA, and the glue application amount is controlled to be 9%.
And fourthly, drying: and (4) carrying out penetrating drying treatment on the glass fiber paper after glue spraying in the step three by using an oven, wherein the drying temperature is 150 ℃, and the drying time is 20 s.
Cutting: and D, slitting the paper obtained in the step four according to different paper specification requirements of customers.
Example 2
Pulping: adding glass fiber and a dispersing agent into a pulp preparation tank, adding tap water for uniform dispersion, adjusting the pulp concentration to 3 percent and the pH value to 7, stirring for 5min, wherein the solid content of the dispersing agent is 11 percent, and the concentration of the added dispersing agent in the pulp is 0.02 percent.
Wet forming: and (4) feeding the prepared slurry obtained in the step one into a forming part, and preliminarily obtaining the glass fiber paper through a net part forming device.
③ drenching the glue: preparing a glue solution with the concentration of 10%, uniformly applying the glue solution to the surface of the glass fiber by using glue spraying equipment, wherein the glue is PVA, and the glue application amount is controlled to be 10%.
And fourthly, drying: and (4) carrying out penetrating drying treatment on the glass fiber paper after glue spraying in the step three by using an oven, wherein the drying temperature is 150 ℃, and the drying time is 20 s.
Cutting: and D, slitting the paper obtained in the step four according to different paper specification requirements of customers.
Example 3
Pulping: adding glass fiber and a dispersing agent into a pulp preparation tank, adding tap water for uniform dispersion, adjusting the pulp concentration to 3 percent and the pH value to 7, stirring for 5min, wherein the solid content of the dispersing agent is 11 percent, and the concentration of the added dispersing agent in the pulp is 0.02 percent.
Wet forming: and (4) feeding the prepared slurry obtained in the step one into a forming part, and preliminarily obtaining the glass fiber paper through a net part forming device.
③ drenching the glue: preparing a glue solution with the concentration of 10%, uniformly applying the glue solution to the surface of the glass fiber by using glue spraying equipment, wherein the glue is PVA, and the glue application amount is controlled to be 9%.
And fourthly, drying: and (4) carrying out penetrating drying treatment on the glass fiber paper after glue spraying in the step three by using an oven, wherein the drying temperature is 150 ℃, and the drying time is 20 s.
Cutting: and D, slitting the paper obtained in the step four according to different paper specification requirements of customers.
Example 4
Pulping: adding glass fiber and a dispersing agent into a pulp preparation tank, adding tap water for uniform dispersion, adjusting the pulp concentration to 1%, adjusting the pH to 6, stirring for 5min, wherein the solid content of the dispersing agent is 11%, and the concentration of the added dispersing agent in the pulp is 0.05%.
Wet forming: and (4) feeding the prepared slurry obtained in the step one into a forming part, and forming by using a net part device to obtain the glass fiber paper preliminarily.
③ drenching the glue: preparing a glue solution with the concentration of 8%, uniformly applying the glue solution to the surface of the glass fiber by using glue spraying equipment, wherein the glue is PVA, and the glue application amount is controlled to be 9.5%.
And fourthly, drying: and (4) carrying out penetrating drying treatment on the glass fiber paper after glue spraying in the step three by using an oven, wherein the drying temperature is 130 ℃, and the drying time is 15 s.
Cutting: and D, slitting the paper obtained in the step four according to different paper specification requirements of customers.
Example 5
Pulping: adding glass fiber and a dispersing agent into a pulp preparation tank, adding tap water for uniform dispersion, adjusting the pulp concentration to 2%, adjusting the pH to 6.5, stirring for 5min, wherein the solid content of the dispersing agent is 11%, and the concentration of the added dispersing agent in the pulp is 0.04%.
Wet forming: and (4) feeding the prepared slurry obtained in the step one into a forming part, and preliminarily obtaining the glass fiber paper through a net part forming device.
③ drenching the glue: preparing a 9% glue solution, uniformly applying the glue solution to the surface of the glass fiber by using glue spraying equipment, wherein the glue is PVA, and the glue application amount is controlled to be 9.5%.
And fourthly, drying: and (4) carrying out penetrating drying treatment on the glass fiber paper after glue spraying in the step three by using an oven, wherein the drying temperature is 140 ℃, and the drying time is 16 s.
Cutting: and D, slitting the paper obtained in the step four according to different paper specification requirements of customers.
Example 6
Pulping: adding glass fiber and a dispersing agent into a pulp preparation tank, adding tap water for uniform dispersion, adjusting the pulp concentration to 4 percent and the pH value to 6, stirring for 5min, wherein the solid content of the dispersing agent is 11 percent, and the concentration of the added dispersing agent in the pulp is 0.03 percent.
Wet forming: and (4) feeding the prepared slurry obtained in the step one into a forming part, and preliminarily obtaining the glass fiber paper through a net part forming device.
③ drenching the glue: preparing a 9% glue solution, and uniformly applying the glue solution to the surface of the glass fiber by using glue spraying equipment, wherein the glue is PVA, and the glue application amount is controlled to be 10%.
And fourthly, drying: and (4) carrying out penetrating drying treatment on the glass fiber paper after glue spraying in the step three by using an oven, wherein the drying temperature is 130 ℃, and the drying time is 18 s.
Cutting: and D, slitting the paper obtained in the step four according to different paper specification requirements of customers.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The preparation method of the flexible glass fiber paper is characterized by comprising the following steps:
step 1, adding glass fiber and a dispersant into water, and stirring to form slurry, wherein the concentration of the glass fiber in the slurry is 1% -5%, and the concentration of the dispersant is 0.02% -0.05%;
step 2, forming the slurry into glass fiber paper by wet forming;
step 3, spraying a layer of glue solution on the surface of the glass fiber paper, wherein the glue of the glue solution is PVA;
and 4, drying the glass fiber paper after glue spraying, wherein the drying temperature is 130-150 ℃, and the drying time is 15-20 s, so as to prepare the flexible glass fiber paper.
2. The method for preparing the flexible glass fiber paper as claimed in claim 1, wherein in the step 1, the length of the glass fiber is 6mm, the diameter is 4.5 μm, and the oil content of the glass fiber is 0.2-0.35%.
3. The method for preparing the flexible glass fiber paper as claimed in claim 1, wherein in the step 1, polyethylene glycol-200 is added into the sizing agent used in the preparation process of the glass fiber.
4. The method for preparing the flexible glass fiber paper according to claim 1, wherein in the step 1, the pH value of the slurry is 6-7.
5. The method for preparing the flexible glass fiber paper as claimed in claim 1, wherein in the step 1, the solid content of the dispersing agent is 11%, and the dispersing agent is 1801 type stearic acid.
6. The method for preparing the flexible glass fiber paper as claimed in claim 1, wherein in the step 3, the concentration of the glue solution is 8-10%.
7. The method for preparing the flexible glass fiber paper as claimed in claim 1, wherein in the step 3, the sizing amount of the sizing solution is 9-10%.
8. The method for preparing the flexible glass fiber paper as claimed in claim 1, wherein in the step 4, the drying mode is through drying.
9. A flexible glass fiber paper prepared by the preparation method of any one of claims 1 to 8, wherein the dry longitudinal strength of the glass fiber paper is not less than 55N/5cm, the wet longitudinal strength is not less than 30N/5cm, and the gel content is 6 to 9 percent.
10. A flexible glass fiber paper as in claim 8, wherein the grammage of the glass fiber paper is 23 ± 2g/m2The density of the glass fiber paper is 180g/cm3。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117753383A (en) * | 2024-01-02 | 2024-03-26 | 华南理工大学 | A method for preparing a low-temperature regeneration dehumidification wheel based on reversible conversion of hydrophilic and hydrophobic materials |
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