JPH0585467U - Extrusion nozzle device for adhesive mixture - Google Patents

Abstract

(57) [Summary] [Purpose] Adhesion that hangs down in a horizontal straight line while maintaining a fine application interval of about 3 mm, which is certified as having a stable adhesion record when applying an adhesive mixture with a vertical stripe pattern. Eliminate co-adhesion between agents and reduce the manufacturing cost to achieve stable distribution of adhesive strength and its enhancement. [Composition] Extrusion of an adhesive mixture consisting of a large-diameter distribution pipe 11a installed perpendicularly to the conveyance direction of the article to be coated 14 and a large number of fine holes 11b formed in the middle and bottom of the distribution pipe 11a. In the nozzle 11, the intervals P1 and P2 between the pores 11b formed on the bottom surface of the extrusion nozzle 11 are coarse in the transport direction of the object to be coated 14 and are dense in the orthogonal direction so that they are in a zigzag pattern in a plurality of rows. Arranged in.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 In the present invention, when manufacturing building materials such as plywood and laminated veneer materials, adhesive and its curing agent, cross-linking agent and other additives are applied to the upper surface of the coated object such as veneer veneer that is continuously conveyed. The present invention relates to an improvement of a coating nozzle applied to an extrusion coating machine for an adhesive mixture, in which the following adhesive mixture is extruded in a single horizontal line and applied in a vertical stripe pattern.

[0002]

[Prior Art]

 A conventional extrusion applicator for adhesive mixtures of this type is known, for example, as an extruder for foaming liquids in JP-A-61-68162, in which the foamed adhesive is used as an outlet orifice assembly, that is, an extrusion nozzle. Then, there was an extrusion coater of an adhesive mixture which extruded in a horizontal straight line on a support, that is, an upper surface of an object to be coated such as a veneer veneer, and applied this in a vertical stripe pattern.

[0003]

[Problems to be solved by the device]

 However, as a practical machine of the extrusion nozzle in the above-mentioned adhesive mixture extrusion coating machine, a narrow tube for extruding the adhesive mixture has a hole diameter of 1/8 inch, about 3 mm. Since the thin tubes are simply arranged in a line, the distance becomes 5/16 inch, about 8 mm, and the adhesive is extruded in a horizontal straight line and applied in a vertical stripe pattern. Since the coating interval of the admixture becomes extremely coarse, a relatively large amount of the adhesive mixture is extruded per unit coating row. Not only was it necessary to perform a double-step operation of spreading the adhesive thinly, but the processing and arrangement of a large number of thin tubes that extruded the adhesive mixture was costly to manufacture, and the veneer veneer, etc. Since the coated body has poor flatness and there are cracks Additional evenly press the adhesive admixture difficult widen laterally in double step procedure, the adhesive strength is that a disadvantage caused a large variation depending on the location.

Therefore, in the present invention, in order to eliminate the above-mentioned drawbacks of the conventional apparatus, it is recognized that a stable adhesive strength can be maintained by applying an adhesive mixture having a vertical stripe pattern, and a fine application interval of about 3 mm is used. While sticking, a part of the adhesive mixture that droops in a horizontal line co-adheres with the adjoining one, and also causes the co-adhesion phenomenon where the coating interval with the adjoining part is abnormally widened. To prevent this, the holes formed on the bottom surface of the distribution pipe should be arranged in a vertical and horizontal direction in a dense and dense manner in the transport direction, and the application interval of the fine vertical stripe pattern should be maintained evenly over the entire surface, and the manufacturing cost should be reduced. The purpose is to economically achieve a stable distribution of the adhesive strength of the veneer veneer and other coated objects and further strengthen it.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, an extrusion nozzle device for an adhesive mixture of the present invention is provided with a large-diameter distribution pipe erected perpendicularly to the conveyance direction of an object to be coated, and a large number of perforations formed in the middle and bottom of the distribution pipe. The extrusion nozzle of the adhesive mixture composed of the pores of the above is constructed with the following requirements.

A) The distance between the pores formed on the bottom surface of the extrusion nozzle.

B) Coarse in the conveying direction of the object to be coated.

C) Be dense in the orthogonal direction.

D) Arranged in a zigzag manner in multiple rows.

[0010]

[Action]

The adhesive mixture extrusion nozzle device of the present invention is, for example, in the cooling circulation type extrusion coating machine shown in the embodiment, the adhesive and its curing agent, cross-linking agent and other additives are mixed at an appropriate ratio. For example, the adhesive mixture prepared by mixing at a ratio of about 10 to 1 is kept at a temperature slightly lower than normal temperature, for example, at a temperature of 10 to 20 ° C., a liquid temperature of about 5 to 15 ° C. In order to minimize the progress of gelling action due to its own chemical reaction during coating work, various coolers are installed in the distribution channel and storage tank to cool the refrigerant such as chilled water made of chilling unit. By circulating in the cooler, the adhesive mixture is kept at a temperature slightly lower than room temperature during a long-time coating operation all day, and the progress of gelation action due to its own chemical reaction is suppressed as much as possible. Adhesive mixture cooling To have. Next, the adhesive mixture held at a temperature slightly lower than room temperature by the cooling means for cooling the adhesive mixture is slightly pressurized to about several Kg / cm ² by an extrusion pump such as a gear pump or a mohno pump, This is supplied to the extrusion nozzle and is extruded in a straight line toward the glue recovery box directly below, and the middle of the extrusion nozzle and the glue recovery box is continuously conveyed by a conveyor. Except for those applied to the upper surface of the article to be coated, the composition is used as an extrusion coating means for an adhesive mixture that coats this in a vertical stripe pattern on the upper surface at a coating amount of, for example, about 200 g / m ^2. The excess adhesive mixture is collected in the storage tank again and can be reused. Next, a flowmeter such as an electromagnetic flowmeter is inserted between the extrusion nozzle and the extrusion pump, and a flowmeter such as about 200 g / m ² is used for the total amount of coating discharged from the extrusion nozzle. The discharge flow rate of the flow-through adhesive mixture of about 20 liters / min is measured, and the rotation of a variable speed motor including an inverter control motor and an AC servo motor that drives the extrusion pump according to the measured value of the flow meter is measured. The number is adjusted by the controller and compared with the specified flow rate set value for the required coating amount so that the discharge flow rate is automatically maintained at a constant value even if the viscosity of the adhesive mixture changes slightly. The flow rate measuring means and the flow rate controlling means of the adhesive mixture are configured so that the rotation speed of the variable speed motor can be automatically controlled. That by the preventing child fluctuations in flow, in which the stabilization of long coating application amount under the working of the adhesive is achieved over a day.

Thus, the extrusion nozzle of the present invention has a large-diameter distribution pipe erected orthogonally to the direction of conveyance of a veneer veneer or the like, and a large number of distribution pipes arranged in the middle and bottom of the distribution pipe. The perforated plate consisting of a large number of small holes arranged in the middle stage of the distribution pipe is pressurized inflow into the large number of small holes formed in the bottom surface. This is a fluid resistor that distributes the adhesive mixture as evenly as possible over the entire area, and the pores that are drilled on the bottom surface have a fine coating interval of about 3 mm. In order to eliminate the abnormal phenomenon caused by a part of the adhesive mixture drooping in a horizontal straight line that co-adheres with the adjacent one when it is reduced to Vertically and laterally densely with respect to the carrying direction, that is, rough in the carrying direction of the coated object, and For example, the application interval in the direction orthogonal to the transport direction should be approximately 3 mm, which is recognized to be able to maintain stable adhesive strength by applying an adhesive mixture in the form of vertical stripes so that it becomes dense in the intersecting direction. At this time, the perforation distance in the transport direction is set to about 3 times that of 9 mm, and some of the admixtures of adhesive that droop in a horizontal line stick together with the next one. It eliminates abnormal phenomena.

[0012]

【Example】

FIG. 4 shows an arrangement example of an extrusion coating machine for an adhesive mixture according to the present invention in a cooling circulation system, in which a fixed amount of an adhesive such as urea resin stored in an adhesive tank 1 is supplied. From an adhesive supply pump 2 consisting of a gear pump, a mono pump, etc., and a diaphragm pump, a mono pump, etc., which supplies a fixed amount of a hardening agent such as an aqueous solution of ammonium chloride corresponding to the adhesive such as the urea resin stored in the additive tank 3. The additive and the additive are pumped toward the mixer 5 while being measured at a predetermined mixing ratio. The outer peripheral portion of the mixer 5, the outer peripheral portion of the storage tank 8 for temporarily storing the adhesive mixture 7 stirred and mixed by the mixer 5, and the periphery of the distribution channel of the other adhesive mixture 7. Cooling means such as coolers 6a and 6b are mounted on the outer peripheral portion of the adhesive tank 1 and, in some cases, the cooling means such as chilled water from the chilling unit 9 for producing the refrigerant. Is circulated and supplied, and the adhesive mixture consisting of the adhesive and the additive is slightly lower than normal temperature, for example, when the temperature is 10 to 20 ° C, the liquid temperature is about 5 to 15 ° C. It is configured as a cooling suppression means for the adhesive mixture that holds it at a low temperature and suppresses the progress of the gelling action by the chemical reaction as much as possible. Next, the adhesive mixture 7 held in the storage tank 8 at a temperature slightly lower than room temperature by the cooling suppressing means is about several Kg / cm ² by an extrusion pump 10 including a gear pump or a mono pump. It is slightly pressurized to supply it to the extrusion nozzle 11, and is extruded in a horizontal straight line toward the glue collecting box 12 directly below and is continuously conveyed by the conveyor 13 between the extrusion nozzle 11 and the glue collecting box 12. On the upper surface of the coated object 14 such as a veneer veneer or the like, which is configured as an extrusion coating means for an adhesive mixture, which applies this in a vertical stripe pattern at a coating amount of about 200 g / m ² , Excessive adhesive mixture 7a other than the one applied on the upper surface of 14 is naturally dropped again into the storage tank 8 or recovered by an appropriate recovery pump or the like, and is recirculated so that it can be reused. It Next, a flow meter 15 such as an electromagnetic flow meter is inserted between the extrusion pump 10 and the extrusion nozzle 11, and the total flow rate of, for example, about 200 g / m ^{2 with} respect to the total coating amount discharged from the extrusion nozzle 11. The flow rate of the flow-through adhesive mixture 7a of about 10 to 20 liters / min relative to the coating amount is measured, and the rotation speed of the extrusion pump 10 is adjusted by the measurement value of the flow meter 15 to keep the discharge flow rate constant. For example, a controller 16 for PID operation is inserted between the variable speed motor 17 such as an inverter control motor for driving the extrusion pump 10 or an AC servomotor and the flow meter 15 so that the value can be maintained. In order to automatically maintain the discharge flow rate at a constant value even if there is a slight change in viscosity of the flow-through adhesive mixture 7a, a comparison is made with a predetermined flow rate set value for the required coating amount. The rotational speed of the variable speed motor 17 so as to automatically control, those that are configured for the flow rate measurement means and the flow control hand stage of the adhesive blend.

Next, as shown in FIGS. 1 to 3, the extrusion nozzle 11, which constitutes a main part of the present invention, has a cross-sectional area of 3000 to 6000 mm ² which is connected to a supply path 18 for the adhesive mixture. In the middle of the distribution pipe 11a having a large diameter, a fluid for distributing the adhesive mixture, which flows under pressure from the supply passage 18, as uniformly as possible over the entire area of the pores 11b formed in the bottom surface thereof. The perforated plate 11c, which is a resistor, is detachably and cleanably arranged by, for example, bending and the like, and the pores 11b having a hole diameter of about 2 mm arranged on the bottom surface of the distribution pipe 11a are arranged in a zigzag form in multiple rows. The details are as shown in FIG. 3, for example, about 9 mm at a rough interval P1 with respect to the transport direction (arrow direction) of the object to be coated, and the transport direction. Close to the orthogonal direction of P2 is arranged in a zigzag pattern in a plurality of rows (three rows in the figure) at intervals of, for example, 3 mm. Therefore, from the pores 11b having a diameter of about 2 mm to the upper surface of the object to be conveyed immediately below. It swells to some extent thicker and then hangs down so that it may be stretched. The adhesive mixture does not co-adhere with the next one, and it is possible to maintain the stable adhesive strength with a horizontal coating interval of about 3 mm. It is extruded in a straight line to enable even vertical stripes to be applied over the entire surface.

[0014]

[Effect of the device]

 According to the present invention, as described above, the pores formed on the bottom surface of the distribution pipe are made dense in the vertical and horizontal directions with respect to the transport direction, that is, coarse in the transport direction of the object to be coated and dense in the orthogonal direction. As described above, since it is an extrusion nozzle device for an adhesive mixture that is arranged in a zigzag pattern in multiple rows, it is concentrated on a unit coating line, which was caused by simply arranging thin tubes in a straight line at coarse intervals in the conventional device. Then, the adhesive mixture applied in large amounts by pressing it together with the superposed objects using a pressing roll, etc., and then spreading it thinly laterally again, requires a double process operation, etc. It is possible to eliminate the rise in manufacturing cost due to the processing arrangement, and to spread the concentrated coating per unit coating row thinly sideways. Extrude the adhesive mixture evenly over the entire surface There also distributed stable adhesive strength per unit area, which was obtained videos outcome overall its contact Chakukyodo is enhanced, is quite significant implementation advantages.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of an extrusion nozzle.

FIG. 2 is a side view of an extrusion nozzle.

FIG. 3 is a rear view of the extrusion nozzle.

FIG. 4 is a side view showing an arrangement example of an extrusion coating machine.

[Explanation of symbols]

 1 Adhesive Tank 2 Adhesive Supply Pump 3 Additive Tank 4 Additive Supply Pump 5 Mixers 6a, 6b Cooler 7 Adhesive Mixture 7a Downflow Adhesive Mixture 8 Storage Tank 9 Chilling Unit 10 Extrusion Pump 11 Extrusion Nozzle 11a Min Piping 11b Pore 11c Perforated plate 12 Glue recovery box 13 Conveyor 14 Substrate 15 Flow meter 16 Controller 17 Variable speed motor 18 Adhesive mixture supply path P1 Coarse spacing P2 Dense spacing

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kazuo Nakane Inventor Kazuo Nakane 5-1, Nitta-cho, Takahama-shi, Aichi 17 Hashimoto Electric Industry Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. An extrusion nozzle for an adhesive mixture, which comprises a large-diameter distribution pipe laid perpendicularly to the direction in which the article to be coated is conveyed, and a large number of pores formed in the middle and bottom of the distribution pipe. Adhesion characterized by arranging in a zigzag form in a plurality of rows such that the intervals between the pores formed on the bottom surface of the extrusion nozzle are rough in the transport direction of the object to be coated and dense in the orthogonal direction. Extrusion nozzle device for mixture of agents.