JPH02124059A - Method for humidifying and aging powder and apparatus therefor - Google Patents

Abstract

PURPOSE:To automatically and continuously carry out a series of operations and simultaneously improve quality by humidifying and mixing powder in a humidifying tank according to a specific method and aging the humidified powder in a powdery state while fluidizing the powder with a gas in an aging tank. CONSTITUTION:Powder of a crosslinkable material (e.g., skim milk powder) capable of providing a crosslinked structure by humidifying is initially fed into a humidifying tank and water containing an additive is sprayed and fed from a nozzle by action of a high-pressure pump while applying stirring with gas streams to simultaneously carry out humidifying and mixing. The humidified powder is then fed to an aging tank and fluidized with a gas in the above- mentioned tank to perform aging while holding the powdery state.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention involves adding water and additives to a powder (hereinafter simply referred to as powder) that becomes crosslinked by humidification, such as skimmed milk powder, and aging it. Addition of powder to be supplied to an injection imaging machine and used to manufacture various products by utilizing irreversibility caused by heating) 5
-Regarding a ripening method and its equipment.

[Conventional technology]

The outline of the humidification and aging procedure for the powder described in Section 1 is given in Section 6.
As shown in the figure. 00 is a mechanical mixer, into which the powder A, water supplied from the water supply pipe 102, and additive B (for example, titanium oxide, fluorescent material, etc.) are charged, and the stirring blade 10
1, and then transferred to a suitable container 103 and aged.

As a result of ripening, the above-mentioned rod-like mass 'vV a is formed. First, this is taken out and crushed by an appropriate means to obtain a coarsely crushed material ~Vb. This crushed material Wb is supplied to the crusher 104 to be crushed and combed. 105, and those that cannot be pulverized are sent to the crusher 10.
4, take out the finely pulverized material W() into a container 10G, and manually supply it to the receiving hopper 108 for the next process, for example, q1 exit molding n107.The supplied fI pulverized material is
It is transferred to the storage hopper 110 of the molding machine 107 by the suction force of 09.

[Problem to be solved by the invention]

Stirring by the blades 101 in the mixer 100 r+!
It generates frictional heat, and there is powder especially between the pages. Powder becomes lumpy due to humidification, and it is difficult to reduce it to a fine powder even if it is crushed by the blades 14 and 101, and there are problems such as easy formation of lump-like coagulation called "balls". Taking out the mixture into a container] 03 is done by hand, which saves time and requires a place where many containers for aging are lined up. Ori, v
1 crushing (to be coarsely crushed in advance to supply to ~104 yet!
It is necessary to make i, thing ~ V b, and generally one piece is made by hand. This is hard labor and dust b1
There may be problems such as the ring t4 becoming ffi.

In view of these points, the present invention automatically performs a series of mixing-stirring ripening operations, improves quality, prevents solidification during ripening, and (11) maintains the shape. The purpose is to facilitate supply to the next process.

[Means to solve the problem]

A first invention for achieving the above object relates to a method, in which a powder containing a crosslinkable material is supplied into an addition tank, and while being stirred by an air current in the tank,
Water containing the additive is supplied in the form of a spray using a high-pressure pump and mixed while humidifying, and the humidified powder is then supplied to an aging tank, where it is given fluidity by gas and maintained in a powder state. It was designed to undergo aging.

The second invention relates to the apparatus, and includes a supply circuit for powder using a crosslinkable material, an addition lα supply circuit for mixing crosslinking water and an additive to the powder to obtain addition 1α, and The humidifying tank is equipped with a blender head that floats and stirs the supplied powder using an air flow, and an aging tank that receives and matures the humidified powder. Equipped with a spray nozzle that sprays the liquid into a spray state, it adds the additive liquid and humidifies the powder while floating and agitating it;
It is equipped with a Brenzo H-soto which floats by air flow, and the stored humidified powder is floated and agitated to maintain the powder form and ripen it.

At this time, it is preferable that the powder supply circuit and the humidifying tank as well as the humidifying tank and the aging tank are connected through an air shaft feed pipe ζ.

[For production]

The powder supplied into the humidifying tank is stirred by an air current, and water containing j, 4 additives is supplied in the form of a spray to uniformly humidify the powder: 1 and harden it to 1:2f. do not have. In addition, by aging in the aging tank with airflow (while moving), the powder is matured without solidifying.

〔Example〕

1 to 5 show embodiments of the invention.

In addition, the 9-ripening H position 1 is connected to the powder supply circuit 2 and the additive liquid supply port 5' which mixes and supplies water and additives. ! 3, a humidifying tank Ll for mixing both powders and humidifying the powder, and an aging tank 5, which are connected by a series of transport vibrators as described later.

The powder supply circuit 2 mainly includes a hopper 10 for charging powder, a pulverizer 1 for further crushing the supplied powder, and a mixing tank 12. First, the powder is put into the hopper IO, stored in the storage tank 13, and then sequentially transferred to the crusher 1 by rotating the rotary valve 1.
Supply to 1. Reference numeral 14 denotes a pressure pneumatic blowing nozzle installed near the lower outlet of the storage tank 13, which forms a fluidized bed inside the tank 13 at a pressure of q7.
The powder is preferably blown tangentially along the inner wall of the tank to prevent the formation of flips when the powder is delivered.
1: This structure is circular, and its explanation will be omitted.

The above-mentioned powder is solidified due to bagging, etc., and the powder may be in the form of particles with a slight diameter (for example, 3 to 5 mm), so in order to effectively humidify, it must be crushed to at least 1 mm or less. Therefore, the above-mentioned pulverization (11) is carried out.

The pulverized powder is stored in a second storage tank 17 via a second hopper 16 and fed into the mixing tank 12 through an air transport pipe 18.

Reference numeral 19 designates a pressure air blowing nozzle for powder transportation provided at a suitable location on the air transportation pipe 18.

In some cases, the above-mentioned powder is not limited to one type, but may be used in a mixture of different production areas or different types, and for this reason, a mixing tank 12 is provided.
serves as a mixing tank as well as a storage tank. As for the mixing means, mechanical agitation has problems such as generation of heat, and is not preferable, so agitation is performed by air flow. An example of such agitation is shown in FIGS. 2 to 4.

Reference numeral 2() is a flender J\soto attached to the lower part of the above-mentioned 7-containing tank 12, and includes a manifold I/21 forming an annular hollow chamber 22 and an on-off valve 30 attached to this manifold. The upper mounting plate 23 of the manifold 21 is attached to the mounting flange 24 of the tank 12, and a number of nozzle plates 25 are attached facing the inside of the tank, each of which is provided with a jet 134 and a hole 26. This nozzle hole 26 is designed to generate swirling air inside the tank. 1
It is perforated.

The on-off valve 30 is the piston rod 3 of the air cylinder 31.
Attach the flexible packing 33 to the tip of 2), and
34, the gaskets 33 are always injected into the gaskets 114 and 26, and the gaskets 3, 3 are lowered only when the air cylinder 31 is operated, and the injection holes 26 are communicated with the annular hollow chamber 22 to inject pressurized air. 35 is a pressure air supply pipe; 3G is a filter provided at the air λJII' outlet in the upper part of the mixing tank 12; 37 is an indicator that detects the height of the powder storage; 38
: This is a pressure static introduction pipe for sending the powder in the tank to the next process. Reference numeral 39 designates a pressure air supply pipe provided at the lower discharge side of the manifold 1''21, which is provided to form a fluidized bed during powder delivery.

A rotary valve 4° is connected to this mixing tank 12, and the powder is delivered and stored in a measuring tank 11. The measuring tank 41 has a well-known structure consisting of a measuring device 42 and a tank body 43, and its explanation will be omitted.

T5) body stored in measuring tank 41 is air transport pipe 45
The humidifier is supplied to the supply hopper 50, and is gradually supplied to the humidifying tank 1 by opening and closing the valve 51 at the bottom. 46
is a pressure air blowing nozzle for powder transportation.

The addition lα supply circuit 5'a3 includes an adjustment tank 60 and a supply tank 61 for mixing water and additives (for example, titanium oxide, fluorescent material, etc.). An adjustment tank 60 (equipped with a water supply pipe 62 and an agitator 63) contains a certain amount of additives and a certain amount of water and stirs them.

In this case, it is not preferable to increase the 6:3 rotation rILl of the stirrer 11 in order to increase the stirring effect because this may result in foaming. Therefore, it is preferable to circulate through the return bypass 166 by switching the delivery pump 64 and the switching hull processor 5.

The sufficiently N I't' mixed liquid mixture is sent to the supply tank 61, in which a certain amount is stored by the iα coulometer 7, and stirred by the agitator 168 to prevent sedimentation of the additive.

In addition, v! If the j12fl in the I adjustment tank 60 becomes too small, there is a risk that the forest will bubble. For this reason, the tank 60 is attached to a measuring device 70; the amount of α is measured by #111j, and when the amount of γα becomes very small, the rotational speed of the agitator 63 is reduced or stopped, and the sending pump 64 and the return pipe 16G are Stir only by circulation.

A pressurizing pump 71 is connected to the supply tank 61 for mixing)
α is sprayed from a spray nozzle 72 attached to the humidifying tank 4 into the tank.

A suction blower 80 is connected to this humidification tank 4, and a blender head 81 is provided at the bottom, and the mixed liquid is added and humidified while the powder is floated and stirred by the suction airflow. may have the same structure as the blender head 20 provided in the mixing tank 12 described above, but another example is shown in FIG.

The blender head 81 includes a casing 82 having an annular groove 83 formed on its upper surface, and a gold plate stretched between the casing 82 and the tank 4. IQ 8 ,=1, and a valve mechanism 85 attached to the center of the housing. Reference numeral 86 denotes an outside air suction pipe, which sucks the outside air that has passed through an appropriate filter (not shown) by operating the suction blower 80, and the powder on the wire mesh 84 is removed by this suction airflow as shown by the arrow in the figure. As shown by the reference numeral, the wire mesh 84 is stretched so as to be lower at the center so as to create a circulating flow that rises at the center and descends along the tank river surface.

The valve n ti 85 consists of a cylinder 87, a valve body 88 attached to the cylinder loft, and a valve seat 89 attached to the housing 82. The valve body 88 is always in contact with the valve seat 89, and is raised by the operation of the cylinder 87. 90 in the figure is a filter attached to the discharge port.

Note that it is not preferable for the mixed liquid to fall from the spray nozzle 72 in the form of water droplets because the powder will harden into granules. For this reason, the pressurizing pump 71 at the start and end of the jet 4
When the pressurizing force is low, the valve (
A needle valve (not shown) is installed and is opened to spray when a predetermined pressure is reached (for example, 70 to 100 kg/cIIl).When the pressure is below that pressure, the liquid is returned via the return circuit 73. It is returned to the supply tank 61.

A transportation tank 91 is connected to this humidification tank 4, and the added powder supplied to the transportation tank 91 is sent out through an air transportation pipe 92, and then selectively supplied to a maturing tank 5.5 forming a pair through a distribution valve 93. be done. , 92a is a pressure air blowing nozzle.

The aging tank 5 is for aging the stored humidified powder while maintaining it in a fluid state, and, like the mixing tank 12 described above, a blender head 20 is attached to the lower part of the tank body 5a.

The aging tanks 5.5 are each connected to a common screw feeder 94, and the powder fed from the screw feeder 94 is supplied to a metering tank 95 and sent via an air transport pipe 96 to the next process, for example, an injection molding machine S! ~ S5 hopper H
1-H5 is selectively supplied by operating distribution valves Vl to V5.

H6 is a body storage tank.

In the above configuration, two or more powders of different types supplied to the hopper IO are each crushed by the crusher 11, turned into fine powder, and supplied to the mixing tank 12. It is floated and stirred by the 111 air current.

In this case, the stirring is not caused by a mechanical stirrer, but by an empty current, so that no heat is generated due to stirring. Further, it is not necessary to perform this stirring all the time, and it is good to perform the mixing intermittently. For this reason, the on-off valve 30 is operated at appropriate intervals to prevent solidification due to its own weight.

This mixed powder is measured by the measuring tank 111, and a predetermined amount of powder is added to the lt tank lIL via the supply hopper 50.
This is supplied. The humidifying tank 4 generates an upward air current from the arranger head 81 due to the suction force of the suction blower 80, whereby the supplied powder floats as shown by the arrow mark in FIG.

At the same time, the additive liquid adjusted in the additive liquid supply circuit 3 is sprayed from a spray nozzle 72 by a pressurizing pump 71, and is combined with the floating and agitated V′l> +t.
Humidify. In order to effectively perform this humidification, powder 721
It is preferable to spray it while supplying it to each child. The degree of humidification is determined by measuring the amount of powder using a measuring tank 41.1. 'f
-Canada? α Dragon: Measured using Au tank 60. Alternatively, it may be determined based on the amount of time the pressurizing pump 71 sprays q1.

Note that the above-mentioned stirring is not mechanical (stirrer), but is stirred by electric current, so that the temperature does not rise due to stirring.

The humidified powder is then sent to aging tanks 5,5. In this aging tank, the humidified powder is floated and agitated by the injection current from the pre-jig head 20, and is kept in a powder form for 9 hours without solidifying. Note that the jet QJχ flow by the brush head 20 does not need to be performed continuously, but may be performed intermittently.

〔Effect of the invention〕

The present invention has the following effects.

The powder is floated and agitated by a flowing air stream in the humidifying tank, and in this state, the additive liquid is sprayed and sprayed to humidify the powder, thereby making it possible to uniformly humidify the powder. In addition, the powder is agitated by air flow, which is 11 times more than the conventional agitation. Unlike V@砿性・agitation by if, stirring does not generate heat.

In addition, the 1H-added powder was similarly aged in the gA formation tank while being stirred by an air flow.
), S-ripened in powder form. The aged product is in powder form and can be fed as is to the next process via an air transport pipe or the like.

Further, by connecting the powder feeding circuit and the humidifying tank, and the humidifying tank and the aging tank through air transport pipes, the entire process can be carried out continuously.

[Brief explanation of the drawing]

Figures 1 to 5 relate to embodiments of the present invention, with Figure 1 being an overall process diagram and Figure 2 being a vertical [fold] view of the blender.
Figure 3 is its plan view, Figure 4 is a vertical cross-sectional view of the on-off valve, 7A
FIG. 5 is a vertical cross-sectional view of a fluidized bed in a humidifying tank, and FIG. 6 is an explanatory diagram of the conventional humidification of powder. 1! i /1 [+ i'u' R52:,
t FH body candy supply cycle 1i'L 3 is 1f addition, α supply circuit, 1 (, is a humidification tank, 5 is a ripening tank, 18.4
5.92 is the air transport pipe, 2081 is Friendano\t,
72 is a spray nozzle. 11i! ! Figure 2 Figure 5

Claims (3)

[Claims] (1) Powder containing a crosslinkable material is supplied into a humidifying tank, and while being stirred by an air current in the tank, water containing an additive is supplied in the form of a spray using a high-pressure pump, and the mixture is humidified and mixed; A method for humidifying and ripening powder, which comprises: supplying the humidified powder to a ripening tank; in the tank, fluidization is imparted by gas, and ripening is performed while maintaining the powder state; (2) A supply circuit for powder containing a crosslinkable material, an additive supply circuit for mixing crosslinking water and an additive to the powder to obtain an additive solution, and a circuit for introducing the powder and supplying the additive solution thereto. The humidification tank is equipped with a humidification tank for adding and an aging tank for receiving and maturing the humidified powder, and the humidification tank is equipped with a blender head that floats and stirs the supplied powder with an air flow and a spray nozzle that sprays the additive liquid in a spray state. In addition to adding and humidifying the additive liquid while floating and stirring the powder, the aging tank is also equipped with a blender head that floats by air flow.
A powder humidification/ripening device characterized in that stored humidified powder is floated and agitated to maintain its powder state while aging. (3) The powder humidification/ripening apparatus according to claim 2, wherein the powder supply circuit and the humidification tank, and the humidification tank and the aging tank are each connected by an air transport pipe.