JPS60179203A - Production unit for fiber reinforced cement board material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an apparatus for manufacturing a fiber-reinforced cement board material, which is reinforced with glass fibers, although it is not particularly limited thereto.

Various devices have already been developed for producing cement board materials reinforced with asbestos fibers.

The present invention includes a vessel containing a liquid cement slurry containing fibers, and a water-permeable endless belt for placing and dewatering a layer of such slurry, the endless belt comprising a series of It relates to a device of this kind which is arranged to rotate around guide rollers, one of the guide rollers together with a parallel roller disposed above defining an outlet for slurry from the vessel onto the belt.

PRIOR ART An example of a device of this type is described in British Patent No. 2,059,867 A to Bell, Maschinenfuhrerbe.

A problem with such previously known devices, especially when using glass fibers, is that the fibers are unevenly distributed, i.e. mostly aligned in one direction, which is generally the direction of the belt. coincides with the direction of movement. The strength of the resulting plate material is lower than if the fibers were oriented in random directions throughout, and in particular, the strength in the direction perpendicular to the direction of belt movement is lower than in the direction of belt movement. It becomes much smaller.

Various attempts have been made to improve the distribution of the fiber mixture within the cement, to provide a random distribution of the fibers, and the use of stirrers within the vessel, but none of these have yielded fully satisfactory results. Not obtained.

(Structure of the Invention) The present invention comprises a vessel containing fiber-containing cement aqueous slurry, and a water-permeable endless belt that is disposed to move around a series of guide rollers and that places and dewaters a layer of slurry. , wherein one of the guide rollers cooperates with an upper parallel roller located above to define a discharge outlet for the slurry from the vessel onto the endless belt, and an agitator is provided in the vessel. In the device, an agitator is extended into the gap between the endless belt and an upper parallel roller disposed so as to cover the upper side at a point where the endless belt passes around the guide roller, and the agitator is used to stir the slurry. The slurry is designed to create turbulence in the slurry immediately upstream of the outlet.

The agitator may be formed of a series of generally uniform blades arranged in vertical planes spaced from each other across the width of the outlet. Advantageously, the blades are arranged in a plane parallel to the direction of movement of the belt and move back and forth parallel to the width of the outlet.

The reciprocating movement of the blade creates turbulence in the slurry immediately upstream of the cement slurry outlet, reducing the tendency of the fibers in the cement to be oriented in one direction and providing a better distribution of the fibers within the cement.

each blade has a vertically extending upper portion mounted on a common horizontally movable carriage and a curved lower portion, one edge of the curved lower portion being closely adjacent to the upper placement roller; Advantageously, the lower end of the roughly curved lower part is configured to extend into the outlet between the endless belt passing around the circumference of the guide roller and the upper disposed parallel roller. The carriage is mounted on rollers on the upper side of the vessel so as to be reciprocally movable, and is arranged to be driven by a motor via a crank and a connecting rod. With this arrangement, the blade reciprocating device can be conveniently located above the level of the cement slurry in the vessel, and the lower end of the blade is located just at the point where the cement slurry enters the outlet. Exhaust tB on the belt
Stirring can be performed to produce the desired turbulence at the location where turbulence is desired.

(Effects of the Invention - (1)) The fiber-reinforced cement board material produced by the apparatus of the present invention has significantly improved strength characteristics, especially the strength ratio in the longitudinal direction and the transverse direction. It turned out that there was. This is due to eliminating the directivity of the fibers in the cement in a specific direction and making the distribution more uniform. This was particularly noticeable in plate materials that used glass fiber as a reinforcing material.

(Example) The present invention will be explained below with reference to the drawings.

As shown in FIGS. 1 and 2, the apparatus includes a vessel lO containing fiber-containing cement aqueous slurry 11.
and a water-permeable endless belt 12, for example made of felt, arranged to be driven around a series of guide rollers 18.14.15. During operation of this device,
Slurry is continuously supplied into the vessel 10 through the supply pipe 16. The right end of Vessel IO is partially;6(,
It is defined by the upper surface of the endless belt 12 passing around the circumference of the guide roller 18, and the other part is defined by the upper surface of the endless belt 12 passing around the circumference of the guide roller 18. ) is defined by an upper disposed parallel roller 17. A small gap between the upper surface of the endless belt 12 and the lower part of the circumference of the upper disposed parallel roller 17 forms the outlet 18 of the vessel 10 and deposits a thin layer 19 of cement slurry on the endless belt 12. .

As in the conventional apparatus, a rotary agitator 20 is disposed within the vessel IO to generate turbulent flow within the slurry 11.

The thin layer 19 of the fiber-containing cement slurry on the endless belt 12 is conveyed by the belt and passes through a first drainage chamber 24 for gravity dewatering and a second drainage chamber 5 for suction dewatering, as is known in the art. Dehydrated. After dewatering, the thin layer 19 becomes a sticky or cohesive web 26 of fiber-reinforced cement, which is separated from the endless belt 12 and wound onto a rotatably pivoted take-up roller 27. When the web layer of fiber-reinforced cement reaches a sufficient thickness on the surface of the take-up roller 27, it is cut in the axial direction of the take-up roller 27, removed from the roller, subjected to pressure dewatering, and cured. I do.

The novelty of the invention is the provision of an additional agitator within the vessel 10 extending into the outlet 18 between the upper parallel roller 17 and the endless belt 12.

This agitator is arranged in a vertical plane parallel to the direction of movement of the endless belt 12 near the outlet and perpendicular to the axis of the roller 18.17, and at a point immediately upstream of the outlet 18 of the vessel 10. It is composed of a series of parallel blades 8o of the same shape which are spaced apart from each other in the width direction. Each blade 30 has a vertically extending upper portion that is attached to a vertical channel member 88 that is secured to a horizontal beam 84 that extends across the width of the vessel 10 . The horizontal beam 84 is provided with upper and lower rails 35,86 which are bolted to each side of the vessel 10 and have grooved upper sides mounted on fixed pivots 89 on two upwardly facing brackets 4θ. The roller 87 and the lower roller 88 are engaged with each other. Vertical channel member 88
A horizontal beam 84 having a horizontal beam 84 constitutes a carriage that can horizontally reciprocate between these rollers 87 and 88. In order to cause the carriage composed of the members 88 and 84 to horizontally reciprocate, a disk 48 is driven by a motor (not shown) via a pivot connecting rod 41, as shown in FIG.
Connected to the upper crank pin 42. The carriage drive mechanism is electrically linked to the endless belt drive, but allows its speed to be varied independently. When the driving speed of the endless belt 12 increases, the speed of the carriage (88.degree. 84) is also increased.

The blade 80 connects the spacing iron 44 at a midpoint along its length.
Connect them to each other to maintain the spacing. The lower portion 45 of each blade 80 is curved so that one edge 46 thereof is shaped to match and proximate the circumferential shape of the upper disposed parallel roller 17. The lower end 47 of each blade 80 extends into the discharge gap between the upper surface of the endless belt 12 passing through the guide roller 18 and the upper disposed parallel roller 17 . Because of this configuration, the horizontal reciprocating movement of the carriages (88, 84) causes the blade 30 to perform horizontal reciprocating movement in a direction perpendicular to the width of the blade 80, creating turbulence at the point where it is desired to stir the slurry. , which allows the fibers in the slurry to be mixed more uniformly and reduces the tendency for the fibers to line up parallel to each other.

(Effect of the invention - (2)) The fracture strength of the glass fiber reinforced cement board material manufactured by the above-mentioned apparatus was measured in the longitudinal direction and lateral direction of the board, that is, in the direction of movement of the bell) 12 and in the direction perpendicular to this. Ta. For comparison, measurements were taken in the case where stirring was first performed by the reciprocating motion of the blade 80 and then when stirring was not performed. The ratio of longitudinal to transverse breaking strength of the plate material with agitation was about 1.8, and the same ratio without agitation was about 1.6. From this, the effect of the present invention was confirmed.

(Modifications) Instead of or in addition to the blade 80, other types of stirring means can be provided in the discharge port between the roller 17 and the belt 12. For example, one or more tubes having an outlet within the outlet may be used to inject air bubbles into the fiber-containing cement slurry. For this purpose, a hollow tube with small holes may be arranged on both sides of the blade 80, and the outlet of the tube may be located near the tip of the lower end 47 of the blade 30. Furthermore, means for applying vibration of the blade 30 is provided near the corresponding vertical axis along the upper portion 81 of each blade 80, and this can be replaced by a movement of each blade in the discharge port (1)-J direction, or a lateral movement G You can also add more.

Many other variations are possible.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view of the device of the present invention; Fig. 2 is an enlarged vertical sectional side view of the left side of Fig. 1; Fig. 8 is a view from the end to show the parallel blades of Fig. 1.2. FIG. 3 is an enlarged side view. 10... Vessel 11... Slurry 12... Endless belt IL 14.15... Guide roller 16... Supply pipe 17... Upper parallel roller 18... Discharge port 19... Slurry Thin layer 20...Rotary stirrer 24, 25...Drainage chamber 26...Web 27...Take-up roller 30...Blade 33...Channel member 34...Horizontal beam 85, 86 ... Rails 87, 38 ... Rollers 89 ... Pivot 40 ... Bracket 41 ... Connecting rod 42 ... Crank bin 44 ... Rod 45 ... Lower part of blade 46 ...・One edge of the blade 47...Lower end of the blade 48...Disc

Claims (1)

[Claims] A vessel containing an aqueous cement solution slurry containing L fibers, and a water-permeable endless belt that is disposed to move around a series of guide rollers and that places a layer of slurry for dewatering. and one of the guide rollers cooperates with an upper parallel roller positioned above to define a discharge outlet for the slurry from the vessel onto the endless belt, and an agitator is provided in the vessel. In the fujG system, a stirrer is extended into the gap between the endless belt and an upper parallel roller arranged to cover the upper side at a place where the endless belt passes around the guide roller, and the stirrer An apparatus for producing fiber-reinforced cement board material, characterized in that a turbulent flow is created in the slurry at a point immediately upstream of a slurry discharge port. 2. Apparatus according to claim 1, wherein the agitator is comprised of a series of homogeneous parallel blades arranged in mutually spaced vertical planes in the transverse direction of the outlet gap. & The device according to claim 2, wherein the blades are arranged in a vertical plane parallel to the moving direction of the belt, and the blades are mounted so as to reciprocate parallel to the width direction of the discharge port. Each swinging blade has a vertically extending upper portion connected to a common horizontally movable carriage and a curved lower portion, with one edge of the curved lower portion being very close to the periphery of the upper disposed parallel rollers. 8. Closely adjacent and the lower end of the lower portion extending into the outlet gap between the endless belt passing around the guide roller and the upper disposed parallel roller. Apparatus described in section. 5. The apparatus according to claim 4, wherein the carriage is mounted on rollers above the vessel so as to horizontally reciprocate. & The apparatus according to claim 5, wherein the carriage is motor driven by a crank and a connecting rod.