JPH0477692B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an apparatus for vibratory drying of glass fiber strips.

[Conventional technology and its problems]

For example, Japanese Patent Publication No. 60-25372 discloses a drying apparatus for chopped strands formed by spinning glass fibers and cutting the strands. In this drying device, a perforated plate is stretched in a closed casing, and a belt conveyor is disposed above the perforated plate. A belt conveyor has a number of outwardly extending "rods" attached to the surface of the belt. The chopped strand is guided onto a perforated plate, and as the belt conveyor moves a large number of rods, the chopped strand sandwiched between these rods is transferred. On the way, the chopped strand is transported by hot air blowing from below the perforated plate. During the drying process, the chopped strands get stuck between the perforated plate and the rod.
It is broken to produce fine glass fiber bundles or single glass fibers (several μm in diameter). A large number of these aggregate to generate a large amount of non-products of cotton lumps, so-called "fluff." Fluff can clog duct systems and dust collectors. Glass fibers contain a water-soluble binder and are dried to remove this moisture, but the above-mentioned transport means do not bond sufficiently with the binder, and the glass fibers have a low bulk density and a weak bond. Quality products are produced.

Furthermore, in the above configuration, since the belt conveyor is disposed above the perforated plate, the passing efficiency of the glass fiber strips of the hot air blown from below the perforated plate, that is, the drying efficiency is low.

[Problem that the invention seeks to solve]

The present invention was made in view of the above problems, and produces high quality glass fiber strips, prevents the occurrence of fluff, and
It is an object of the present invention to provide a vibration drying device for glass fiber strips with high drying efficiency.

[Means for solving problems]

The above purpose is to introduce the thin pieces obtained by cutting a wet strand of glass fiber onto a perforated plate stretched in a sealed casing, and to pass the perforated plate from below while being transported by vibration. A vibrating dryer that dries with hot air blowing upward, and a Grizzriver connected to the downstream side of the vibrating dryer and stretching along the transfer direction on the upstream side of a straight vibrating trough, It consists of a vibrating feeder with an iron powder separator installed above it.
The fly fluff in the glass fibers discharged from the vibrating dryer is sieved by the Grizz River and guided outward, and while the part under the sieve is transferred by the vibration of the vibrating trough, the iron powder under the sieve is removed by the upper iron powder separator. This is achieved by means of a vibratory drying device for glass fiber strips, which is characterized in that it removes powder.

[Effect]

There is no transfer means above the perforated plate, so that the drying efficiency can be increased and the glass fiber pieces can be transferred while being dried. Unlike conventional methods, there is no member to mechanically tear the glass fibers, and fluidization is promoted by vibration, which further improves drying efficiency and almost eliminates the occurrence of "fluff." . In addition, in the vibrating feeder, a grizzly bar formed on the upstream side separates the mixed fluff, and an iron powder separator on the downstream side separates the mixed fluff.
Iron powder is removed. As a result, high-quality products with high bulk density and strong bonding can be produced.

〔Example〕

Hereinafter, an apparatus for vibrating glass fiber strips according to an embodiment of the present invention will be described with reference to the drawings.

In the figure, the vibrating dryer is indicated as a whole by 1, and glass fiber pieces (hereinafter simply referred to as material) discharged from the vibrating dryer are supplied to a feeder 2 for separating primary fluff. The material from which fluff has been primarily separated is supplied to a spiral feeder 3, and from there is supplied to a feeder 4 for secondary fluff separation.

The vibration dryer 1 will be explained in more detail later, but
Air in the atmosphere is sucked by the cooling blower 5 and introduced into the sealed casing 8 of the vibration dryer 1 . As will be explained later, most of the circulating hot air is heated by the heater 6 and from there is also introduced into the closed casing 8 of the vibration dryer 1 via the conduit 7.

Next, details of the vibration dryer 1 will be explained with particular reference to FIGS. 5 to 7.

An air exhaust duct 9 is attached to the closed casing 8 via a bellows 21, and the cold air and hot air introduced into the closed casing 8 are discharged from this into a circulation system path to be described later. Although the exhaust duct 9 is connected to a duct system to be described later through a connecting member 23, it is vibrationally isolated by a bellows 21 and is appropriately fixed to a stationary part.

A material intake port 10 is formed at the right end of the sealed casing 8 in FIG. It is put into the casing 8. Further, a material discharge port 11 is formed at the left end of the sealed casing 8, and the dried material is supplied from there to the feeder 2 for primary fly fluff separation described above.

An air introduction casing 12 is integrally fixed to the airtight casing 8, and hot air is introduced into the airtight casing 8 through hot air intakes 24 and 25 formed in the airtight casing 8.
Air from the atmosphere is introduced through. It is assumed that the inner space 20 of the air introduction casing 12 is provided with a partition, although not shown, for partitioning the cold air introduction chamber and the hot air introduction chamber.

A perforated plate 18 is stretched in the closed casing 8 and defines a material transfer space 19 above it. The entire sealed casing 8 is supported by coil springs 13 and 14 via struts 15 and 16 so as to be able to vibrate on the ground. Furthermore, a pair of vibration electric motors 17a and 17b are fixed to both side walls of the sealed casing 8, as shown in FIGS. 6 and 7, to linearly vibrate the sealed casing 8 in the direction of arrow a (FIG. 5). It's becoming like that. In addition, arrow a
As shown in the figure, the vibration angle is quite large in this example, but this allows the material transfer speed to be reduced and the drying time to be lengthened. Vibration electric motor 1
7a and 17b are fixed to the sealed casing 8 so that the mounting angles can be changed, and the vibration angles can be changed as appropriate.
It may be made variable.

Next, details of the primary fluff separation feeder 2 will be explained with reference to FIGS. 1 and 2. This feeder 2 is a so-called electromagnetic vibration feeder, and is placed on a base 51 and its height is adjusted so as to receive material from the upstream side. As is well known, the drive unit includes a pair of leaf springs 50, a movable core 53,
It consists of an electromagnet 52 and the like, and a fluff separating screen 48 is formed on the upstream side of the trough 47, and the fluff separated there is discharged to the outside through a guide portion 49. In addition, since this part is constructed similarly to the feeder 4 for secondary fly fluff separation, the feeder 4 is illustrated in more detail.

The spiral feeder 3 has a known structure, in which a spiral trough 55 is integrally wound around a vertical cylindrical body 54, the whole is supported on the ground by an anti-vibration spring 57, and a driving part 56 This causes torsional vibration around the vertical cylinder 54. Due to this vibration, the material is transported upward along the trough 55,
It is supplied from the discharge end 58 to the feeder 4 for secondary fluff separation.

Next, details of the secondary fluff separation feeder 4 will be explained with reference to FIGS. 8 and 9.

This feeder 4 is also a so-called electromagnetic vibration feeder, and is placed entirely on a pedestal 59. A fluff separating section 61 is formed on the upstream side of the trough 60,
As the fluff sieving surface 62, Grizz River is stretched along the transfer direction of the transfer path with narrow gaps between each. The fluff on the sieve is discharged to the outside through the guide section 72. The bottom of the sieve is guided to the downstream side of the trough 60.

The drive section of this feeder 4 consists of two parts,
A pair of leaf springs 63 and 71, movable cores 68 and 70 fixed to the bottom of the trough 60, and an electromagnet 6, respectively.
It consists of 7,69. Leaf springs 63 and 71 connect the trough 60 and the base block 65, and the base block 65 is connected to the frame 59 by the coil spring 66.
supported above.

Above the downstream side of the trough 60 is an iron powder separation device 6.
4 is arranged and supported by a pedestal 59,
It has a large number of magnetic poles 73, and is adapted to attract and adsorb iron powder from the material flowing below. This iron powder is, for example, iron powder spilled from a cutter when cutting a glass fiber strand with a cutter.

Next, the air supply system and exhaust system will be explained.

Cooling air is sucked in from the atmosphere by the blower 5 and introduced into the cooling air intake 29 of the vibration dryer 1 via the bellows 30, as shown in FIG. The blower 5 side is vibrationally insulated by the bellows 30. The hot air is introduced from the duct 7 into the hot air intakes 27, 28 of the vibration dryer 1 via the branch duct 32 and the bellows 22, 31, as shown in FIGS. 4, 6, and 7. Bellows 22,3
1, the branch duct 32 side is vibrationally insulated. The cold air and hot air introduced from the intake ports 27, 28, and 29 pass through the material on the perforated plate 18 in the vibration dryer 1, and are collected in the exhaust duct 9.
7 and 38 and a branch duct 41 into the lower intake ports of the pair of dust collectors 40a and 40b.

The dust collectors 40a and 40b mainly have a rectangular cylinder body 42.
and a furnace cloth (not shown) disposed inside the furnace cloth, which collects dust from the air introduced from the lower intake port. The purified air is introduced into the above-mentioned heater 6 through the outlet 43 and the ducts 45 and 39.

An exhaust blower 33 is connected to the duct 37 as shown in FIGS. 2 and 3, and this is driven by a motor 34 via a belt 35. The duct 9 serves to suck air for cooling and drying from the drive dryer 1. This suction force forces the air to flow toward the duct 38 on the downstream side.

Further, a hot air blower 80 is connected to the duct 7 as shown in FIGS. 2 and 4, and this is driven by a motor 81 via a belt 82.
This serves to suck in drying air from the heater 6 connected to the duct 7. This suction force causes the heated air to flow toward the duct 32 on the downstream side.

The dust collectors 40a and 40b each have an exhaust port 44 through which the circulating air is partially discharged to the outside of the system. Furthermore, although not shown, a fresh air intake is provided to mix fresh air with the circulating air.

Although the embodiment of the present invention is configured as described above,
Next, this effect will be explained.

A material inlet 10 of the vibration dryer 1 is continuously supplied with chopped glass fiber strands cut by a cutter (not shown). The sealed casing 8 is linearly vibrated in the direction of arrow a by driving the pair of vibrating motors 17a and 17b. Since the vibration angle is large enough,
The material supplied to the material intake port 10 is transferred to the left in FIG. 5 on the perforated plate 18 by vibration at a relatively low speed. Since hot air is constantly blown from the hot air intake ports 24 and 25, the material on the perforated plate 18 is sufficiently fluidized by the passage of the hot air and the vibration, and at the same time is subjected to a stirring action. It is then heated with hot air and dried. The hot air that exchanges heat with the material and contains moisture is sucked into the exhaust duct 9.

Atmospheric air (room temperature) is constantly blown through the cold air intake port 26, and the material that has reached the downstream side of the perforated plate 18 is cooled by the cold air that blows through the perforated plate 18. At this time, similar to the effect of hot air on the upstream side, it is sufficiently fluidized and is therefore effectively cooled. The cold air that has undergone heat exchange is sent to the exhaust duct 9.
being sucked into. It is assumed that the suction force into the exhaust duct 9 is appropriately selected by controlling the motor 34 that drives the blower 33. The cold air and hot air after heat exchange are mixed in the exhaust duct 9, and then passed through the ducts 37, 38, 41 to the dust collectors 40a, 40.
Fresh air is partially mixed from the outside into the air flow that is introduced into b and collects dust here, and
A portion of the collected airflow is exhausted to the outside. As a result, the humidity of the circulating air flow is kept below a predetermined value. The air flow is heated by a heater 6 and is passed through a duct 7,
32 and then back to the hot air intake 2 of the vibration dryer 1.
It will be introduced in 4.25. Note that fresh air from the atmosphere is always introduced into the intake port 26 by the blower 5.

The material dried in the vibration dryer 1 and cooled (to approximately room temperature) is supplied to the primary fluff separation feeder 2 through the material discharge port 11. In this embodiment, although the amount of fly fluff generated in the vibration dryer 1 is small compared to the conventional device, the fluff is separated in order to obtain a higher quality product.

In the primary fluff separation feeder 2, the fluff is separated on the fluff separating sieve surface 48, and the pieces as a product are guided to the downstream side of the trough 47 as the bottom of the sieve. The separated fluff is discharged to the outside through the guide section 49.

The material from the feeder 2 for primary fluff separation is fed to the lower end of the spiral feeder 3, and is fed into the trough 55.
The fluff is transported upward along the line and supplied to the feeder 4 for secondary fluff separation. Similar to the feeder 2 for primary fluff separation, the material is transferred by the vibration of the trough 60,
The fluff is secondarily separated by the fluff sieving surface 62. In other words, although the primary fly fluff separation feeder 2 on the upstream side has sufficiently separated the fly fluff, in order to separate it more reliably or to separate the fly fluff generated in the subsequent transfer process, this is necessary. The fluff is separated by a feeder 4 for secondary fluff separation. Since fluff is a fluffy material, ordinary screens may become clogged, thereby reducing the efficiency of supplying high-quality glass fiber strips. In the present invention, the Grizz River is stretched along the transport direction, and although the fly fluff is in the form of cotton clumps, it is transported over the Grizz River by the vibration force without clogging, and the sifted glass fiber pieces are placed below the Grizz River. will be transferred. Therefore, the fluff separated on the sieve is discharged to the outside through the guide portion 72.

The material used as the under-sieve material is guided to the downstream side of the trough 60, and when passing under the iron powder separator 64, the mixed iron powder is attracted and adsorbed by the magnetic poles 73. The trough 60 supplies high quality material free of fluff and iron filings.

The embodiment of the present invention is constructed and operates as described above, and has the following effects.

(a) Unlike conventional dryers, no external mechanical force is applied inside the dryer, so the generation of fluff can be reduced. Therefore, products with high bulk density and strong bonding can be produced. A feeder for separating primary and secondary fluff allows for higher quality products.

(b) Since there are no transport means above the perforated plate in the dryer that would impede the free passage of hot or cold air, the passage of these air streams through the material can be facilitated.

(c) Since it is subjected to the stirring action of vibration, fluidization is uniform on the perforated plate and the material is not ruptured.

(d) Since the material is conveyed by vibration, it does not damage the binding by the binder.

(e) The residence time for drying and cooling can be easily adjusted by adjusting the vibration conditions (vibration surface, frequency, width). The flow state can also be changed by adjusting the vibration surface.

(f) Since there is no member that presses the material onto the perforated plate, the perforated plate will not be abraded by glass powder. Therefore, no metal abrasion powder gets mixed into the dryer.

(g) Mixing hot air for drying with cold air after cooling the material,
The energy consumption of the heater can be reduced because the duct system is used to circulate the parts that are partially discharged to the outside.

The embodiments of the present invention have been described above, but of course the present invention is not limited thereto, and various modifications can be made based on the technical idea of the present invention.

For example, in the above embodiment, the vibration sources of the vibration dryer 1 are a pair of vibration electric motors 17a and 17b, but the vibration source is not limited to this, and various known vibration sources (electromagnets,
Circulating shaft drive mechanism, etc.) can be applied.

Furthermore, in the above embodiment, cold air is blown into the vibration dryer 1 to cool the material after drying and heating inside the machine. Cooling may be performed through means.

〔Effect of the invention〕

As described above, according to the vibratory drying device for glass fiber strips of the present invention, the grizzly bar stretched along the transport direction of the vibrating trough sieves the fluff, which is a cotton lump-like substance, onto the sieve. After being guided outward, the glass fiber strips under the screen are vibrated and transferred downstream of a vibrating trough, and the iron powder is removed by an iron powder separator. That is,
Since the iron powder mixed in the glass fiber pieces is removed after the fluff is removed, the fluff does not get in the way and can be removed efficiently, making it possible to produce products of higher quality than before. can.

[Brief explanation of the drawing]

FIG. 1 is a side view of a vibration drying apparatus according to an embodiment of the present invention, FIG. 2 is a plan view thereof, FIG. Fig. 5 is a partially broken enlarged side view showing details of the vibration dryer in Fig. 1, Fig. 6 is a sectional view in the - line direction in Fig. 5, and Fig. 7 is Fig. 5. FIG. 8 is an enlarged perspective view of the feeder for separating secondary fluff in FIG. 1, and FIG. 9 is an enlarged side view thereof. In the figure, 1...vibration dryer, 4...2
Next air cotton separation feeder, 8... Sealed casing,
17a, 17b... vibrating electric motor, 18... perforated plate, 60... trough, 64... iron powder separation device.

Claims (1)

[Claims] 1. The thin pieces obtained by cutting the glass fiber strands in a wet state are introduced onto a perforated plate stretched in a sealed casing, and are blown through the perforated plate from below to above while being transferred by vibration. A vibrating dryer that dries with hot air is connected to the downstream side of the vibrating dryer, and a Grizzriver is stretched along the transfer direction upstream of a straight vibrating trough, and an iron wire is placed above the downstream side of the vibrating dryer. It consists of a vibrating feeder equipped with a powder separator, and the fluff in the glass fibers discharged from the vibrating dryer is sieved by the Grizz River and guided to the outside, and the area under the sieve is transferred by the vibration of the vibrating trough. 1. A vibration drying apparatus for glass fiber pieces, characterized in that the iron powder under the sieve is removed by an upper iron powder separator.