JPH08344Y2 - Adhesive foaming equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a device for foaming an adhesive, particularly an adhesive applied to a veneer constituted by plywood in the production of plywood.

[Conventional technology]

Urea resin, melamine resin, as a means for producing a foamed adhesive by mixing a liquid adhesive such as a phenolic resin with a gas such as air, for example, the production of plywood using the foamed adhesive of US Pat. No. 3,895,984, etc. There is.

[Problems to be solved by the device]

The foaming device disclosed in U.S. Pat. No. 3,895,984 includes an outer cylindrical surface of an inner rotor 82 and an outer stator.
A plurality of recesses 92 and a plurality of recesses 86 are provided on the inner cylindrical surface of 80 so as to face each other, and an adhesive and a gas are caused to flow in the gap between the rotor 82 and the stator 80, and the adhesives are applied by the action of the recesses 86, 92. And the gas are agitated and mixed to form a foamed adhesive. However, since the adhesive and the gas mainly flow axially in the gap between the rotor 82 and the stator 80, a sufficient agitation action is not given, which is good. However, there is a problem in that a simple foam adhesive is not generated.

[Means for solving the problem]

Along the outer cylindrical surface of the inner rotating cylindrical body and the inner cylindrical surface of the outer fixed cylindrical body, a long slender inner long groove and outer long groove having a plurality of axially divided portions are respectively bored, and the outer and inner long grooves are bored at the divided portions of the bored long groove. The ring-shaped closing members are provided at axially offset relative positions or at opposing relative positions.

[Action]

A mixture of an adhesive and a gas by means of inner and outer ring-shaped closing members provided at axially displaced relational positions or opposing relational positions at division positions of the inner long groove and outer long groove formed in the inner rotating cylinder and the outer fixed cylinder Alternates between the inner long groove of the inner rotating cylinder and the outer long groove of the outer fixed cylinder, and the inner and outer long grooves are replaced by the centrifugal force generated by the rotation of the inner rotating cylinder. The adhesive and the gas are surely and sufficiently agitated and mixed by the stirring action by the rotation of the inner rotating cylinder.

〔Example〕

The inner rotating cylindrical body 1 is formed by both side walls 2 and 3 at the end and a cylindrical portion 4, and a rotating shaft 6 supported by a bearing 5 is fixed to one side wall 2 to drive the rotating shaft 6. The inner rotating cylindrical body 1 is rotationally driven by a driving mechanism 7 such as a motor. The outer cylindrical surface 8 of the cylindrical portion 4 is provided with radially elongated inner long grooves 9 at appropriate intervals, and each inner long groove 9 is provided with a plurality of divided portions so as to be at the same position in the axial direction. In addition, an inner ring-shaped closing member 10 such as an O-ring is attached to these divided portions.

The outer fixed cylindrical body 11 is formed by both side walls 12 and 13 at the ends and the cylindrical portion 14, and the inner cylindrical surface 15 of the cylindrical portion 14 and the outer cylindrical surface 8 of the inner rotating cylindrical body 1 have a slight gap. It is fixedly arranged outside the inner rotating cylindrical body 1 so that D (1.5 mm or the like) is formed. On the inner cylindrical surface 15 of the cylindrical portion 14 of the outer fixed cylindrical body 11, a plurality of outer elongated grooves 16 elongated in the axial direction are radially provided at appropriate intervals, and each outer elongated groove 16 has the same position in the axial direction. In addition, a plurality of dividing points are provided so as to be in a relational position that is axially displaced or opposite to the dividing point that is provided in the inner rotating cylindrical body 1, and an O-ring or the like is provided outside each of these dividing points. A ring-shaped closing member 17 is attached. Therefore, the inner ring-shaped closing member 10 attached to the inner long groove 9 of the inner rotating cylindrical body 1 and the outer ring-shaped closing member 17 attached to the outer long groove 16 of the outer fixed cylindrical body 11 have a gap D therebetween as shown in FIG. As shown, they are attached so that they are axially displaced relative positions or opposite relative positions as shown in FIG. It is desirable that the inner long groove 9 formed in the inner rotating cylindrical body 1 and the outer long groove 16 formed in the outer fixed cylindrical body 11 are provided so that the same number of them are in a relational position facing each other.

An end space Sa having an appropriate width is provided between one side wall 3 and the side wall 13 of the inner rotating cylinder 1 and the outer fixed cylinder 11 and the other side wall 2 thereof.
An end space Sb having an appropriate width is formed between the side wall 12 and the side wall 12, and the end space Sa and the end space Sb communicate with the gap D and the inner long groove 9 and / or the outer long groove 16, respectively. It is provided to do.

One side wall 13 of the outer fixed cylindrical body 11 has one end space.
An adhesive supply pipe 18 for supplying an adhesive to Sa and a gas supply pipe 19 for supplying a gas such as air are additionally provided.
Is connected by a pipeline to a glue tank 20 for storing liquid adhesive such as urea resin, melamine resin and phenol resin and a metering pump 21 such as Gyapump. Adhesive supply means for supplying to the partial space Sa is configured, and the gas supply pipe 19 is a pipeline for a compressor 22 for gas such as air, a flow rate adjusting valve 23, a flow meter 24 (digital mass flow meter).
And a gas supply unit configured to measure a gas such as air by the compressor 22 or the like and supply the gas to the end space Sa.

The flow rate is measured by the metering pump 21 and the flow meter 24, respectively, and a predetermined flow rate of the adhesive and gas such as air sent from the adhesive supply pipe 18 and the gas supply pipe 19 to the one end space Sa from the end space Sa. It moves toward the other end space Sb,
The adhesive and gas that have entered the end space Sa enter the inner long groove 9 formed in the inner rotating cylinder 1 or the outer long groove 16 formed in the outer fixed cylinder 11 through the gap D or directly near the end space Sa. In the case where the inner ring-shaped closing member 10 and the outer ring-shaped closing member 17 are attached while being axially displaced, the adhesive and gas in the inner long groove move in the direction of the end space Sb while the inner ring moves. External long groove 16 which is shielded by the block-shaped closing member 10 and faces through the gap D
Then, the adhesive and the gas that have entered the outer long groove 16 are blocked by the outer ring-shaped closing member 17 while moving in the direction of the end space Sb, and are transferred to the opposite inner long groove 9 through the gap D. Further, the adhesive and the gas that have entered the inner long groove 9 have a force toward the outer long groove 16 which opposes due to the centrifugal force due to the rotation of the inner rotating cylindrical body 1, and the adhesive and the gas in the outer long groove 16 which oppose each other through the gap D. Will be replaced. The adhesive and the gas move in the direction of the end space Sb by repeating this transfer and replacement, but the gap D from the one long groove to the other adhesive and the gas is opposite.
When the transfer and the replacement are performed via the, the strong stirring action is imparted by the rotation of the inner rotating cylindrical body 1 and the slight gap D, and the adhesive and the gas are evenly mixed and the gap D causes the adhesive to mix. It is possible to generate a fixed amount of foamed adhesive in which the size of the bubbles mixed therein is limited and bubbles of an appropriate size are present in the adhesive. When the inner ring-shaped closing member 10 and the outer ring-shaped closing member 17 of each of the inner long groove 9 and the outer long groove 16 are attached at the positions where they are opposed to each other, the adhesive and the gas rotate the inner rotating cylindrical body 1 and both inner and outer Since the long grooves are replaced with each other, a stirring action is imparted, and the foaming rate is slightly lowered.

As a foaming device, for example, the inner rotating cylindrical body 1 has a diameter of about 120 m.
m, a cylinder with a length of about 500 mm, rotating at about 600 rpm, supplies urea resin adhesive containing an appropriate amount of foaming agent and curing agent from the adhesive supply pipe 18 to the end space Sa of 10 l per minute, Gas supply pipe 19
In a test example in which 5 kg / cm ² of compressed air was supplied at a rate of about 40 l / min, a suitable foamed adhesive containing small-sized air bubbles having a volume increased by about 5 times was obtained. The foamed adhesive obtained in this way passes from the end space Sb to the other side wall 12 of the outer fixed cylinder 11.
From the discharge pipe 25 attached to the sheet, a flow having a substantially constant flow rate is fed to an extruder or the like that applies a foaming adhesive to the upper surface of a single plate or the like. The cooling cylinder 26 provided on the outside of the outer fixed cylindrical body 11 is
Cooling water is caused to flow in the cylinder to cool the outer fixed cylinder 11 to adjust the temperature of the mixture of the adhesive and the gas.

[Effect of device]

Equipped with an inner rotating cylinder and an outer fixed cylinder with a small gap between the cylindrical surfaces, and axially divided inner and outer long grooves are formed in the outer cylindrical surface and the inner cylindrical surface of each cylinder, and both cylinders are formed. The inner and outer ring-shaped closing members are attached to the respective divided inner and outer long groove portions of the body at axially displaced relative positions or opposing relative positions, and adhesive and compressed gas are supplied to one end space of both cylindrical bodies. The adhesive and gas that have flowed in are moved from one long groove to the other long groove and moved in the axial direction while being exchanged. A strong stirring action is imparted by the transfer and / or the exchange and the rotation of the inner rotating cylinder, so that the adhesive and the gas are surely mixed with each other to form the foamed adhesive, and the gap between the both cylinders causes the formation of bubbles. Limited size A foamed adhesive in which bubbles of an appropriate size can be mixed together, and since the adhesive and the gas are pre-measured and supplied to the foaming device, a foamed adhesive with a constant foaming rate can be obtained. At the same time, it has various effects such that the foamed adhesive can be fed to the next-stage extruder or the like as a constant flow.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a sectional view of the entire foaming device, FIG. 2 is a partial sectional view of the foaming device in which the attachment position of a ring-shaped closing member is changed, and FIG. FIG. 4 is a sectional view taken along the line XX of FIG. 4, and FIG. 4 is a sectional view taken along the line YY of FIG. 1 ... Inner rotating cylinder, 2, 3, 12, 13 ... Side wall, 8 ... Outer cylindrical surface, 9 ... Inner long groove, 10 ... Inner ring-shaped closing member, 11 ...
… External fixed cylinder, 15… Inner cylindrical surface, 16… Outer long groove, 17…
… Outer ring-shaped closing member, 18 …… Adhesive supply pipe, 19 …… Gas supply pipe, 21 …… Quantitative pump, 22 …… Compressor,
24 …… Flowmeter, 25 …… Discharge pipe, D …… Gap, Sa, Sb ……
Edge space.

Claims (1)

[Scope of utility model registration request] 1. An inner rotating cylinder and an outer fixed cylinder, each of which has a slight gap between its cylindrical surfaces and an end space communicating with the gap between side walls of both ends. On the outer cylindrical surface of the rotating cylindrical body and the inner cylindrical surface of the outer fixed cylindrical body, there are a plurality of divisions so that they are in the same axial position and are axially displaced or in relation to each other. A plurality of inner long grooves and outer long grooves are provided radially at appropriate intervals, and an inner ring-shaped closing member and an outer ring-shaped closing member are attached to each divided portion, and one of the outer fixed cylindrical bodies is provided. An adhesive supply pipe and a gas supply pipe communicating with one end space are attached to the side wall, and a discharge pipe communicating with the other end space is attached to the other side wall of the outer fixed cylinder, and the adhesive is used. The supply pipe has a metering pump that measures and supplies the liquid adhesive from the glue tank. Foaming device of the adhesive to the gas supply pipe is connected to adhesive supplying means comprising such, characterized by being configured to connect the gas supply means comprising a supply compressor or the like to meter compressed gas such as air.