JPH1024431A - Rigid urethane pouring method for continuous production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize continuous production by a method wherein a plurality of mixing heads are arranged close to each other in the neighborhood of the inlet of double- conveyors at both the sides of the conveyors so as to direct the stock pouring height and angle of each nozzle or of a pair of nozzles vertically and horizontally in order to pour stock from an opposing pair of the nozzles and change the other pair of the nozzles over depending on stock situation. SOLUTION: Rigid urethane stock liquid 9 is poured to the central position of a lower surface part 5, for example, from the nozzle parts 7 and 7' of an opposing pair of mixing heads A and B, which are arranged on both the sides of conveyors 1. When abnormality appears in the filling properties of the spread stock liquid 9 and consequently a pair of the mixing heads A and B are changed over to a pair of mixing heads C and D, the stock liquid 9 is discharged from nozzle parts 8 and 8' before the stopping of the pouring through the nozzle parts 7 and 7' so as to stop the pouring through the nozzle parts 7 and 7' simultaneously with the arrival of the spread pattern formed by the stock liquid 9. The angles of the mixing heads A, B and C, D can be changed back and forth to the running direction of surfacing materials and their vertical movements and the change of their angles for controlling the altitudinal position between the upper and lower surfacing materials can be made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The hard surface material (plywood, metal plate,
The present invention relates to a continuous production method of sandwich panels (use: building materials, cold storage, refrigeration panels, etc.) made of rigid urethane foam (including isocyanurate-modified).

[0002]

2. Description of the Related Art A typical method for continuously producing sandwich panels made of rigid urethane foam is to feed a lower surface material to a foaming / curing device by a horizontally installed conveyor, and to use a tensioner roll as a top material on a lower surface material. Place it on
It is a horizontal type which is supplied in such a manner that a wedge-shaped space having an angle with the lower surface material is formed at an inlet of foaming and hardening. The foam raw material is injected into the lower surface material. Several injection methods are employed depending on the width and thickness of the panel product and the characteristics of the foam material. It is necessary that the injected raw material is uniformly spread on the face material and has a uniform thickness. Further, before the lower surface material into which the raw material is injected enters the foaming / curing device, the progress of the foaming / curing of the raw material liquid must be limited to an allowable range.

[0003] Various injection methods for realizing the raw material injection characteristics have been put to practical use. That is, for a thin panel (about 30 mm or less) with a narrow panel width, one
In the case of a point injection method, a medium thickness (approximately 50 mm), and the reactivity of the raw material is general, a method of injecting with two units is adopted. For a thicker (about 100 mm), general reactive material, there is a traverse method in which the mixing head is moved in the width direction of the face material in consideration of the speed of transport of the face material, the curing speed, and the like. Further, for manufacturing a wide panel (600 to 1500 mm), a shower nozzle system in which a number of injection nozzle holes are arranged in a width direction on a lower surface material is adopted.

[0004] Any of the injection methods is a method in which both surfaces are used as a soft surface material (kraft paper, asphalt felt, aluminum foil, glass paper, etc.) or a combination of an upper surface soft surface material and a lower surface hard surface material. A typical example in which the lower surface material is a hard surface material (plaster board, wood wool cement board, or plywood) and the upper surface material is a soft surface material uses an inversion type in which the soft surface material is inserted along a roll. In order to inject the raw material into the upper surface material to be inverted, the space for installing the mixing head for dispersing the raw material can be widened, and a traverse method is adopted.

[0005]

The raw material injection method for continuously manufacturing a rigid urethane sandwich panel as described in the prior art is actually used. However, there are many problems in selection of panel surface materials, injection of raw materials having different reactivities, adaptation to panel widths, and equipment operation rates.

[0006] From the viewpoint of continuous operation, a desirable equipment as a continuous production apparatus of a hard urethane sandwich panel is that it can be produced by the same equipment regardless of the hard or soft material of the face material. Only horizontal and vertical panels are used for the production of panels with double-sided soft facings, only capable of handling upper and lower soft facings. That is, the greatest cause of the decrease in the operation rate is brought by the method of material injection.

[0007] The high-performance raw material injection method is capable of coping with the width and thickness of the panel and the reaction speed of the raw material liquid. Looking at the above-mentioned prior art from such a technical viewpoint, there is a problem to be improved. (1) In the one-point injection (one mixing head) method, there is a limit in the spray filling property for spreading the raw material liquid on the face material as quickly and uniformly as possible. Therefore, applicable panels are narrow and limited to thin objects (30 mm or less). (2) In the two-point injection (two mixing head) method, the panel width becomes large (600 to 900 mm) and the medium thickness is 50 mm.
Although it can be manufactured to a certain degree, the problem remains in the spray filling property as well. (3) In the traverse method (one mixing head), the thickness control is easy, and the method is adopted as a method excellent in flatness. There is a problem in the point. In other words, a large deployment space is required to dispose the traverse drive mechanism that satisfies the spray filling of various raw materials. (4) In the shower nozzle method, the raw material liquid stirred and mixed by one or two mixing heads is sprayed from a large number of nozzle holes of the nozzle portion provided on the face material, and thus the spray filling property is excellent. However, there is a problem that the clogging of the nozzle by the foamed foam easily occurs as compared with other methods, and the operation rate is reduced due to the frequency of cleaning and renewing the nozzle.

When a raw material liquid having a high reaction rate is used in addition to the spray filling property of the raw material liquid, it is necessary to spray the raw material liquid near the inlet of the pressurizing conveyor. However, the closer to the conveyor, the closer to the tip of the wedge-shaped space, the narrower the installation of the mixing head becomes. Furthermore, the mixing of the raw materials of the special formula having a high reaction rate requires a large-sized special mixing head, and accordingly, the arrangement space becomes large and the installation becomes more and more difficult. In addition, when a sandwich panel is produced using a hard upper surface material, when the upper surface material is inserted by increasing the opening angle of the mixing head installation space, that is, the wedge-shaped space, the upper and lower surface material tips are difficult to match. . Further, when the upper surface material is hard and hard to bend, the material is injected at a position in a wide space away from the entrance of the pressurizing conveyor. In the case of continuous molding of sandwich panels using a double conveyor, etc., before foaming starts, if the panel is not introduced into the pressure / hardening area in the double conveyor,
It causes unfilling or poor thickness. In particular, when the surface material is thick and hard to bend, when the panel size (width and thickness) is large, and when the reaction rate is high in the compounding system, it becomes remarkable.

[0009]

In the present invention, as a means for solving the above-mentioned problems, a hard urethane raw material liquid is sprayed on a lower surface material continuously transferred to a double conveyor for pressurization, and the hard urethane raw material is spread on the lower surface material. In a device for continuously producing a sandwich panel formed by pressing a band-shaped or plate-shaped panel sandwiched between a material and an upper surface material by the double conveyor and foaming and curing the same, the upper and lower surface materials are located near an entrance of the double conveyor. And the opposite side where hard urethane raw material is injected on both sides of the wedge-shaped space created at the entrance of the double conveyor
A plurality of pairs of mixing heads are provided close to each other, and the raw material is injected from a pair of the mixing heads facing each other, and the mixing head is switched to another pair of mixing heads that are on standby at any time depending on the raw material injection state. In addition, the mixing heads for injecting the raw materials individually or in pairs form a moving degree of freedom that can change the height of the raw material injection and the angle of the raw material injection direction up and down and left and right, respectively. The present invention proposes a continuous production hard urethane injection method characterized by continuously manufacturing sandwich panels driven by a mechanism having the same.

In the continuous production of sandwich panels using a soft urethane material on both sides of a hard urethane raw material, the distance between the urethane materials can be widened without any problem. In addition, a method for producing a sandwich panel composed of an upper soft surface material and a lower hard surface material has been established using individual devices. However, from the viewpoint of production efficiency, from the viewpoint of production equipment, an apparatus capable of producing a sandwich panel using both hard and soft face materials in the same facility is desirable. The present invention, in order to insert the nozzle portion of the mixing head from the outside of the lower surface material support roll,
There is no problem even if the distance between the upper and lower surfaces is small. Therefore, the upper surface material lacking in flexibility is sent to the conveyor in parallel with the lower surface material or at a smaller angle formed by both surface materials. It is possible to eliminate or reduce the bending deformation of the face material at a position where the insertion angle changes parallel to the lower face material. That is, it can be produced with the same equipment from a soft double-sided surface material to a lower hard surface material and a surface material lacking in flexibility on the upper surface.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the means for solving the problems will be described below in detail. 1. 1. Raw Material Injection Mechanism 1.1 Mixing Head Installation Method A plurality of mixing heads, which are located outside the width of the lower surface material conveyor and are opposed to each other, are arranged side by side. The hard urethane raw material mixture is injected into the lower surface material on the conveyor by a pair of nozzles facing each other from the outer side of the conveyor.

1.2 Continuous Raw Material Injection Method Before the clogging phenomenon of the nozzle portion at the time of continuous production, the raw material injection operation is appropriately switched to another mixing head pair in a standby state. In addition, a work procedure for periodically switching between the two mixing head pairs is also possible. This method, that is, a method of periodically switching the injection head, is particularly effective in a compounding system having a fast reaction.

1.3 Continuous Injection Monitoring Mechanism Equipped with a camera device for monitoring the discharge of raw materials from the nozzle portion of the mixing head and the filling status thereof and transmitting the status to a monitor, or an injection status monitoring device similar to a camera device. May be. At this time, the watcher does not have to be full-time,
The position of the mixing head and the setting conditions may be automatically adjusted by processing the injection state by image analysis. The optimum position for discharging the raw material from the nozzle portion and monitoring the state of filling is between the double-sided materials and close to the nozzle portion. In the case where the space between the both surfaces is narrow, for example, in the case of a surface material lacking flexibility, monitoring is performed from the outside between the both surfaces near the parallel plane between the two surfaces. Alternatively, the rising state of the form is photographed using a small camera.

2. Injection position and its preparation method Raw material is injected by a mixing head from both sides of the conveyer toward the center of the moving continuous strip-shaped or plate-shaped lower surface material. The injection amount, injection position, and the like need to be changed depending on the size of the panel, the transfer speed (productivity, etc.), the properties of the compounding system, and the like. In order to satisfy these processing conditions, not only the capacity of the foaming machine but also the number of the foaming machines and the mixing head injection position (up and down, left and right) are handled and processed. The distribution of the injected urethane raw material is performed in a wide range so that there is no space between the mixing head and each raw material. The direction and amount of raw material injection are arbitrarily adjusted, and the thickness of the panel, line speed, reactivity of raw material liquid,
It is determined by the flight distance at the time of ejection. For example, the conventional spraying method cannot cope with a material that is made of resin quickly, but can be processed by the present method. In particular, when the face material is thick and hard to bend, when the panel size (width and thickness) is large, and when the reaction rate is high, the composition becomes remarkable.
Even in such a case, if the injection is performed from the side, the injection can be performed at the optimum position close to the entrance of the conveyor if there is a gap of about the diameter of the nozzle.

Embodiment 1 The construction of the continuous manufacturing equipment is as follows: a face material transporting apparatus 1, a double conveyor for pressurizing 2, a mixing head (urethane foaming machine) A,
B, C, D, the surveillance camera 4 and the like. The present invention relates to the installation position of the mixing head and the operation method, and the arrangement of the equipment will be described with reference to the drawings. FIG. Is a bird's-eye view of the arrangement. Lower surface material 5,
It is process schematic which manufactures the sandwich panel which consists of the surface material 6 lacking in upper surface flexibility continuously. Double-sided material is transport device 1
To the pressurizing conveyor 2. Mixing heads are installed as A, B pairs and C, D pairs outside the double-sided material, between 5, 6 between the double-sided materials. The nozzles of the mixing head for injecting the raw material liquid between the two surfaces are the nozzles 7 of the mixing head A (hereinafter abbreviated as A7), B
There are two pairs of 7 'pairs and C8 and D8' pairs, and the nozzle portion is usually inserted between the two side materials. In FIG. 1, C8, D8 '
The raw material liquid 9 is injected from the pair. The injected raw material liquid 9 is sandwiched between both surfaces, and a foaming / curing reaction proceeds in the pressurizing conveyor.

FIG. Is the installation state of the mixing head. The angle of the mixing head 11 can be changed back and forth with respect to the surface material advancing direction (an angle formed by a line perpendicular to the edge of the surface material is called a horizontal angle). In addition, the vertical movement for adjusting the height position between the parallel upper and lower surface materials, and the angle (in the parallel surface with the lower surface material,
The angle formed by a plane perpendicular to this plane and passing through the center axis of the head is called an elevation angle). Nozzle part 1
When the cholesterol-like resin adheres to 2 and the discharge pattern of the liquid starts to change, the mixing head is washed. For this reason, the mixing head installation table 13 can be moved backward on the support frame 14. is there.

Approximately 1 from the drive shaft of the pressing belt conveyor 2
From the position of 000 mm, a pair of mixing heads were installed at an interval of 200 mm between the injection nozzle centers at the upper side and the lower side in the surface material transport direction. The horizontal angle at which the head was attached was set at 30 degrees, the elevation angle was 15 degrees, and the head was set at the center position between the parallel plane members.

The general-purpose hard urethane raw material liquid 9 is poured and 100
mm-thick sandwich panels were continuously produced. Fig. 3 shows the progress of curing of the raw material liquid. As shown in the figure, it proceeded ideally. At this time, the progress of the curing after the injection differs depending on the hard urethane raw material liquid.

FIG. Shows a spraying material pattern 16 at the time of switching the injection. When the mixing head is filling the raw material normally, the raw material liquid discharged toward the center of the surface material in the advancing direction of the surface material lands on the surface material before the front part, and foams and expands first. To start. Due to the expansion force, the raw material liquid at the near side is extruded toward the end of the face material, and a sandwich foam having a uniform thickness is obtained. From this viewpoint, the injection angle of the mixing head was set. When switching to C and D from A and B pairs installed well in the traveling direction of the face material,
In the opposite case, the procedure was as follows. 1) The raw material mixture 9 is injected from a pair of opposed nozzles provided on both sides of the conveyor 1 toward the center of the lower surface material 5 at the raw material lay-down portion of the conveyor. 2) In the injection state of the A and B mixing head pairs, an abnormal phenomenon appears in the filling property of the spraying material liquid, and C,
And when switching to the D mixing head pair; In switching from the A, B pair to the C, D pair located in the upstream direction of the conveyor flow from the A, B pair, C8, C8, The spray pattern 17 formed by discharging the raw material liquid from the D8 'pair nozzle and the raw material liquid discharged from the C8, D8' pair nozzle is a spray pattern 18 of A7, B7 'pair.
Upon reaching the position, the injection of the A and B pairs is stopped. Immediately, the A and B mixing heads retreat, perform mixing head cleaning, and wait for the next replacement.・ Conversely, when switching from C and D pairs to A and B pairs, C
The discharge of the A and B pairs starts at the same time as the final spray pattern 19 of the discharge liquid enters the discharge pattern 20 of the A7 and B7 'pairs. The C and D mixing heads whose injection has been stopped are evacuated to start the mixing head cleaning operation.

As a result, the panel sandwiched with the produced rigid urethane foam material was a good product with no filling and no defective thickness.

Example 2 A raw material liquid having a high reactivity was produced by an injection method in which a mixing head was periodically switched. If continuous production is possible by this method, the effect on productivity is very large. For example, even if it is a general-purpose raw material and can be continuously manufactured for 4 to 8 hours, the raw material of the special formulation is reduced to 15 to 30 minutes. In other words, the manufacturing apparatus must be temporarily stopped for cleaning the mixing head, which greatly affects the productivity. A special raw material was injected by periodically switching the two pairs of mixing heads A and B and C and D every 10 minutes. As a result, continuous production was possible even with the raw material composition having a high reactivity.

[0022]

According to the present invention, two pairs of raw material liquid injection mixing heads used for continuous production of a rigid urethane foam sandwich panel are provided on the lateral side outside the upper and lower surface materials to be conveyed, by monitoring the raw material discharge state of the mixing head, or In addition, by performing timely replacement with another pair that is on standby at regular intervals, continuous production could be performed while the raw material liquid was always kept in the property discharge state. Also,
Since the mixing head deployment space is outside the upper and lower surface materials, it is not necessary to secure a deployment space on the surface material, and both surfaces can be conveyed to the pressing conveyor in parallel or at a small angle. It could be supplied to the foaming / curing section without significant bending deformation. Accordingly, it has become possible to continuously produce a sandwich panel using a hard surface material and a surface material lacking flexibility as well as a hard soft surface material property of a lower surface material. This greatly contributed to improving the productivity of the equipment.

[Brief description of the drawings]

FIG. 1 is a bird's-eye view of an arrangement of manufacturing equipment showing an embodiment.

FIG. 2 is a view showing an embodiment of mounting a mixing head.

FIG. 3 is a graph showing changes over time in foaming and curing of an injection raw material liquid in Examples.

FIG. 4 is an embodiment showing a procedure for switching a mixing head pair.

[Explanation of Codes] 1. Surface material transfer device Double conveyor for pressurization A, B, C, D. Mixing head ４． Surveillance camera 5. Hard lower surface material 6. Top material 7,7 ', 8,8' lacking flexibility. 8. Nozzle section of mixing head Raw material liquid injected 11. Mixing head 12. Nozzle part 13. Mixing head installation base 14. Support frame 16.17.18.19. Spraying raw material pattern

Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display B29L 9:00

Claims (1)

[Claims] 1. A hard urethane raw material liquid is sprayed on a lower surface material continuously transferred to a pressurizing double conveyor, and the hard urethane raw material is strip-shaped between the lower surface material and the upper surface material.
Or, press the plate-shaped panel with the double conveyor,
In a device for continuously producing foamed and cured sandwich panels, a pair of opposing mixing units located near the entrance of a double conveyor, injecting hard urethane raw material into both sides of a wedge-shaped space created by upper and lower panels. A plurality of heads are provided in close proximity to each other, of which a raw material is injected from a pair of mixing heads facing each other, and, depending on the raw material injection status, is switched to another pair of mixing heads that are on standby as needed. The mixing heads to be injected are individually
Alternatively, a pair of pairs continuously manufactures a sandwich panel driven by a mechanism having a degree of freedom of movement capable of changing a raw material injection height and a raw material injection direction angle up and down and left and right, respectively. Hard urethane injection method for continuous production.