JP2001038754A - Method and apparatus for producing hard polyurethane foam molded object - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a molding time and to arbitrarily alter the number of lamination stages corresponding to the thickness of a molded object by laminating support surface plates on which panel frames are placed to inject a hard polyurethane foam foamable raw soln. compsn. in the panel frames under pressure by the press machine of the laminate to foam and mold the same. SOLUTION: A press machine 1 is equipped with two hydraulic cylinders and a pair of upper and lower hot surface plates 2a, 2b. Three support plates 3 are used in the press machine 1 to hold three panel frames 7 to pressurize the same. Support devices 5A, 5B are provided on the left and right sides of the press machine 1 to enable the arrangement of a plurality of the support surface plates 3. The support surface plates 3 are arranged on the support device 5A and panel frames 7, 7' are placed on the surface plates. The panel frames 7' have a size about half that of the panel frames 7 but a large number of these small panel frames can be placed. The panel frames different in shape are placed on the support surface plates to efficiently produce hard polyurethane foam molded objects having different sizes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for heat insulation panels, building materials, etc. used for freezing warehouses, cold storage warehouses, cold storage warehouses, heat insulation cold storage vehicles, etc., which have a hard polyurethane foam layer on the outside surface and a hard polyurethane foam layer inside. The present invention relates to a method for producing a rigid polyurethane foam molded article and an apparatus for producing a rigid polyurethane foam molded article.

[0002]

2. Description of the Related Art As a method for producing a rigid polyurethane foam molded article having an outer surface material, a method of producing a molded article of a uniform thickness by preventing deformation of the rigid polyurethane foam during foaming is performed. A method is employed in which a double-sided material and a frame material are sandwiched between the surface plates, and a rigid polyurethane foam foaming stock solution composition supplied from a mixing head of a foaming machine is injected through an injection port provided in the frame material.

At this time, in order to increase the production efficiency, as shown in FIG.
And insert the panel frame 7 between the heat platens 21 in a state where the panel frame 7 is placed on the carrier plate 23.
A method for producing a rigid polyurethane foam molded article by injecting a rigid polyurethane foam foaming stock solution into each panel frame 7 under pressure by the above method has been used.

[0004]

However, the above method has the following problems. 1) In the state where the pressurization of the multi-stage press machine 20 is released, the heat platen 21 is vertically arranged step by step, so the carrier plate 23 on which the panel frame 7 is placed is placed on each hot platen. In addition, an expensive loader / unloader device 24 must be used to remove the molded panel, which increases the cost of the product. 2) Since the carrier plate 23, which is an aluminum plate, has low hardness and is easily damaged, the surface accuracy is reduced due to long-term use, and scratches on the surface cause defects such as surface scratches and irregularities on the surface material. . Further, the required thickness accuracy cannot be sufficiently achieved. 3) The carrier plate 23 is required to be lightweight and excellent in heat conductivity. Usually, an aluminum plate is used. However, deformation occurs due to pressurization and heating during molding, and repair work or renewal is required in some cases. Becomes 4) The number of stages of the heat platen 21 and the interval between each heat platen are determined by the
It is determined at the manufacturing stage of 0 and cannot be changed. Therefore, it is not possible to mold a product thicker than the heat platen interval, and it is not possible to produce a molded product having more than the number of stages of the heat platen 21 in a single process even if it is thin. ineffective.

In order to avoid such a problem, the heat platen is vertically
Using a pair of presses, a thickness control member and a panel frame are placed on a wood plywood having a thickness of 10 to 20 mm as a carrier plate, and these are stacked to form a pair of upper and lower hot plates. A method of injecting a rigid polyurethane foam foaming stock solution into each panel frame by injecting a stock solution of polyurethane into each panel frame is also used.

[0006] However, the foaming / curing reaction of the rigid polyurethane foam foam stock solution depends on the temperature, and the temperature of the panel frame 7 is unstable even if the wood plywood is preheated. If the heat capacity of the material is large,
In winter etc., the temperature of the face material does not rise sufficiently, and it takes a long time for the curing reaction of urethane foam to proceed sufficiently,
After all, improvement of production efficiency cannot be expected.

SUMMARY OF THE INVENTION It is an object of the present invention to be able to dispose a face material in a press machine in a state where it is preheated to a predetermined temperature, to shorten the time required for molding, and to use expensive equipment such as a loader / unloader. It is possible to change the number of laminating stages arbitrarily according to the thickness of the rigid polyurethane foam molded article (hereinafter, sometimes simply referred to as molded article) in multi-product production without requiring any special equipment, and extra production space is required. Provided are a method of manufacturing a rigid polyurethane foam molded article that is not required, and a manufacturing apparatus used in the method.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a method for producing a rigid polyurethane foam molded article having a panel frame and a rigid polyurethane foam foam filled therein, wherein the panel frame is mounted on a supporting platen. Panel frame mounting process,
A loading step of laminating the support platen on which the panel frame is placed to form a laminate for molding, injecting a rigid polyurethane foam foaming stock solution composition into the panel frame under pressure by a press of the laminate for molding, A polyurethane stock solution injecting step of foaming and filling, and a dismounting step of releasing the molded rigid polyurethane foam by releasing the pressure and lamination,
The support platen has a heating means, and the panel frame mounting step, the loading step, and the unloading step are performed at at least two places around the press machine.
When the stacking step is performed at one of the locations, the molding laminate is set on the press machine, and when the polyurethane stock solution injection step is performed, the unloading step and the panel frame mounting are performed at other locations. And a loading step.

The present invention is also directed to an apparatus for producing a rigid polyurethane foam molded article having a panel frame and a rigid polyurethane foam foam filled therein, comprising at least a pressing machine, a foaming machine, a plurality of supporting platens, and the press. A loading device for supporting and moving the support surface plate around the machine, comprising at least two support devices capable of mounting the support surface plate, the support surface plate having heating means, and It is possible to individually arrange on the support device, the panel frame is placed on the support platen on the support device, and the support platen on which the panel frame is placed is stacked by the loading device. Under the pressure of the press machine of the molding laminate, the foaming machine injects, foams and fills the rigid polyurethane foam foaming stock composition into the panel frame under pressure of the pressing machine to form a rigid polyurethane. The injection of the undiluted polyurethane solution as a tanform molded article is possible, and the molding laminate after the injection of the undiluted polyurethane solution is configured to be unloaded by the loading device on the support device, and the at least two The molding laminate formed on one of the supporting devices is disposed in the press, and when the polyurethane undiluted solution is being injected, the rigidity is released by dismounting on another supporting device. It is characterized in that the polyurethane foam molded body can be taken out, the panel frame is placed on the support surface plate, and a molding laminate is formed by laminating the support surface plate.

A feature of the present invention is that the supporting platen, which is conventionally provided only in the press machine, is a member independent from the press machine while maintaining the structure capable of heating, and the panel frame is mounted on the support platen. Placed in that state to form a laminate for molding, which is arranged in a press machine to perform a predetermined molding, and at least for mounting a support platen around the press machine Preferably, two support devices are provided on the left and right sides of the press machine, and the support platen can be taken out in the left and right directions of the press machine. The molding laminate formed on one of the support devices is heated by the press machine. While inserting and arranging between the surface plates and performing molding, on another supporting device, the molded laminate after molding is released for each support surface plate, the molded body is taken out, and a new panel frame is removed. Are placed and laminated to form a laminate for molding, and preferably Lies in the fact that in the state.

In this case, since the panel frame is preliminarily heated to a predetermined temperature by the supporting platen, the polyurethane solution can be injected immediately after being pressurized by the press machine,
The molding cycle is shortened.

Further, since the supporting platen is not fixed by the press machine, the number of stages used can be freely increased or decreased. The press machine has a pair of heat platens, and the number of stages is within the range of daylight. In the case of producing a thick molded body, the number of supporting platens is reduced, and in the case of a thin molded body, the number is increased, and efficient production can be performed.

Further, when the supporting devices are arranged linearly on the left and right sides of the press machine, it is possible to prepare the stacking of the panel frames in the vicinity of the supporting device, and it is possible to arrange the panel frames for each panel frame having a different size. do not need. Further, the supporting device and the loading device can also have relatively simple structures, which is preferable.

The supporting device is a member on which the supporting platen is placed, and may be a simple table or a conveyor device. A configuration in which a base portion and a conveyor device are provided side by side may be employed.

The support platen in the present invention functions as a heat platen of a press machine, has a strength necessary for the platen, is a plate-like body having a heating means, and is structurally different from a carrier plate. Also in terms of strength. Although the material constituting the supporting surface plate is not limited, a steel material is preferable, and the thickness is preferably about 40 to 60 mm.
The length and width are appropriately set depending on the size of the molded body to be manufactured, the size of the hot platen of the press used, and the like, but the present invention is particularly suitable for manufacturing a large panel-shaped molded body, A panel having a width of about 2.4 m and a length of about 8 m can be manufactured. Generally, the width is about 1.5 m or less and the length is 6
Many panels of about m or less are manufactured. Since the foaming pressure of the rigid polyurethane foam is 0.2 to 0.4 ton / m ² , the support platen can be configured as in the present invention.

The heating means for the supporting platen is preferably a simple heating medium circulation system, and the temperature can be easily adjusted.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing an example of the manufacturing apparatus of the present invention, and FIG. 2 is a top view.

The press 1 to be used is provided with two hydraulic cylinders S and a pair of upper and lower heat bases 2a and 2b.
Since the supporting surface plate 3 is also used at the lowermost stage, the lower surface plate 4 does not have to be a heating system. In this figure, the shape of the press is rectangular in a top view, but is not limited to this. Also, three or more hydraulic cylinders may be used.

The pressing machine 1 uses a three-stage supporting platen 3,
3 shows a state in which three panel frames 7 are similarly sandwiched between the respective support bases 3 and are pressed.

A support device 5A and a support device 5B are provided on the left and right sides of the press machine 1, and a plurality of support bases 3 can be provided. The supporting device 5A is provided with a supporting surface plate 3, on which panel frames 7, 7 'are placed. In this example, the panel frame 7 'is about half the size of the panel frame 7, but a larger number of smaller-sized panel frames can be placed. As in this example, according to the present invention,
By mounting the panel frames having different shapes on the supporting surface plate, it is possible to efficiently manufacture rigid polyurethane foam molded products of different sizes.

In FIG. 2, the press 1 is provided with a mixing head 15 of a foaming machine via a head guide 16, and the mixing head 15 of the foaming machine is movable right and left and up and down of the press 1. The foaming machine is configured to be able to move in and out so that the injection port of the mixing head 15 of the foaming machine can contact the injection port of the panel frame 7. In FIG. 2, the mixing head 15 of the foaming machine is
Although only one is installed on only one side surface of the press machine 1, it may be installed movably around the press machine 1, or a plurality of them may be installed. The main body of the foaming machine is not shown.

The height of the supporting devices 5A and 5B is preferably the same as the height of the lower heat platen of the press machine 1 when the pressure is released.

A loading device 11 is provided on the supporting devices 5A and 5B. The supporting devices 5A and 5B and the loading device 11
If they are installed in a predetermined positional relationship, they need not necessarily be connected. The loading device 11 moves the support platen 3 up and down with respect to the support device 5 (5A, 5B), a direction away from the direction approaching the support device 5, and a direction approaching the press machine 1 along the support device 5. Since it is movable in the separating direction and is movable in the three-dimensional direction, the supporting surface plate 3 can be moved and loaded only by the movement.

FIG. 3 shows an example of the configuration of the loading device 11. The loading device 11 includes a hook 12 that moves by locking the support platen 3 and a cylinder 13 that moves the hook 12 up and down. Hydraulic cylinder 1
3 can also be moved by the hydraulic cylinder 14. The configuration of the loading device 11 is not limited to this, and a device such as a holding device or an electromagnetic magnet can be used instead of the hook 12, and a hydraulic cylinder, a ball screw drive system instead of the hydraulic cylinders 13 and 14, Known means such as a driving method using a chain or a timing belt can be employed.

The panel frame 7 may be one in which a face material and a peripheral member are integrally formed in advance, and a lower surface material, a frame material (peripheral member) and an upper surface material are combined on the support platen 3. May be created. The face material is not particularly limited, and examples thereof include known materials such as wood plywood, painted steel sheet, decorative paper, and resin film. Use a release material on one side,
You may peel off and stick another face material after shaping | molding. Further, another face material may be pasted on the face material used at the time of molding to obtain a product.

The number of support stools can be set appropriately according to the purpose within a range not exceeding the daylight of the press machine 1. The support platen 3 is provided on its upper surface with a thickness regulating member (thickness liner) 17 for regulating the thickness of the target rigid polyurethane foam molded article. This thickness regulating member is configured to be removable so as to be changed according to the thickness of the rigid polyurethane foam molded article to be manufactured. FIG. 2, FIG.
Describes an example in which two support platens 3 are installed in parallel in the length direction using a hollow aluminum pipe, but the present invention is not limited thereto. Multiple short steel bars may be used. Since the rigid polyurethane foam is formed by foaming, that is, volume expansion, a molded article having a predetermined thickness can be obtained by defining the maximum thickness by the thickness regulating member.

The support platen 3 needs to be capable of being heated, and a known heating method such as electric heating or circulation of a heating medium can be used. 2 and 5 show examples of a support platen for circulating a heat medium. A pipe 9 for circulating a heat medium is connected to each of the support platens 3 so that heating and temperature control can be performed in any of a support device, a press machine, and a pressurized state. As the heat medium, a known heat medium such as heat medium oil or hot water can be used. Since the temperature of about 40 ° C. is required for the foam curing reaction of the rigid polyurethane foam, the use of warm water is preferred.

As a means for passing the heat medium through the support surface plate 3, it is preferable to form a heat medium passage inside the metal plate constituting the support surface plate 3. For connection to the heat medium pipe from the heat medium heating device, it is preferable to use a coupler 10 which can be easily attached and detached. The connection with the heat medium pipe may be different from the case where the heat medium pipe is mounted on the support device 5 and the case where the heat medium pipe 9 is disposed on the press machine 1. Support surface plate 3
May be followed according to the movement of the vehicle.

FIG. 3 shows an example of a cross section taken along the line AA of FIG. 2. A panel frame 7 is placed on a support platen 3 and this set is stacked in three stages using a loading device 11. Then, an example was shown in which a laminate for molding was obtained. The panel frame 7 comes into contact with the upper and lower heated support surfaces, is heated, and immediately after being disposed in the press machine 1, the stock solution of the rigid polyurethane foam foam stock solution can be injected. The width of the support device 5 is preferably smaller than the width of the support platen 3, so that the loading device 11 can be supported by the hooks 12 without any problem.

Accordingly, for example, the panel frames 7 are placed on the support platen 3 individually arranged on the support device 5A, and are sequentially laminated by the loading device 11 and placed in a standby state as a laminate for molding. Then, the molded laminate after molding is taken out from the press 1 onto the support device 5B, and the molded laminate on the support device 5A is immediately sent to the press 1 for disposition and pressurized to inject a polyurethane undiluted solution. On the other hand, the molding laminate on the support device 5B is unloaded in parallel by the loading device 11 in parallel, the rigid polyurethane foam molding is taken out, the panel frame 7 is placed and laminated, and a standby state is formed as the molding laminate. Put on. By performing such steps alternately on the left and right, a rigid polyurethane foam molded article can be efficiently produced. As a matter of course, the unloading step is unnecessary at the beginning of the manufacturing operation, and the loading step is not particularly required at the end of the operation.

In the molding laminate shown in FIG. 3, for example, the support surface plate 3 on which the panel frame 7 is mounted is lifted by the loading member 11, and in that state, the loading member 11 is moved along the supporting device 5, and It is formed by repeating the operation of placing the panel frame 7 on the supporting surface plate 3. In this case, the support device 5 may be a simple table. Unpacking is performed by the reverse operation.

In order to insert the molding laminate between the heat platens of the press machine 1 and to take out the molding laminate after molding, it is preferable to provide a separate insertion / extraction means. You may move it.

[Alternative Embodiment] For the movement of the support surface plate 3, a transfer device such as a conveyor device or a feed roller is provided in the support device, and the transfer device of the support table is used for the movement in the direction of approaching / separating from the press machine. And a support platen on which the panel frame is placed,
The vertical movement of unloading may be performed by using the loading device 11.

The lamination and unloading of the support platen 3 may be performed by the following method. (1) Using the loading device 11 and the conveyor device 25, the loading device 11 does not move in the press 1 direction, its movement is two-dimensional, and the support platen 3 is moved to the stacking position by the conveyor device 25. , Lifted up by the loading device 11 to form a space in the lower part, and transferred another support surface plate 3 to this space,
The support platen lifted up is lifted down and laminated. This operation is repeated to complete a predetermined number of layers (FIG. 4A).

(2) The stacking device 11 is composed of a horizontal support arm 27 whose position is fixed and which can be extended and retracted in the horizontal direction and a vertical support arm 28 which can be extended and retracted in the vertical direction. The support platen 3 moved to the vertical position is pushed up by the vertical support arm 28, and the pushed up support platen 3 is supported by the lateral support arm 27 to form a space below, and another support plate is formed in this space. The board 3 is transferred and pushed up by the vertical support arm 28 to be stacked. This operation is repeated to complete a predetermined number of layers (FIG. 4B).

The press 1 used is provided with a hydraulic cylinder at the top, but may be of the type provided at the bottom to raise the lower heat platen 4.

The formation of the rigid polyurethane foam is performed by a known method. That is, an active hydrogen-containing compound containing a catalyst, a foaming agent, and the like, a so-called polyol component and an isocyanate component that reacts with active hydrogen are mixed by a mixing head of a foaming machine, and a rigid polyurethane foam foaming liquid composition is formed in the space of the panel frame 7. It is formed by using an appropriate method such as low-pressure foaming or high-pressure injection molding injecting a stock solution. As the polyol component and the isocyanate component, commercially available materials are preferably used, and for example, a sofurane stock solution system (Toyo Tire & Rubber Co., Ltd.) can be used.

[Brief description of the drawings]

FIG. 1 is a side view of a manufacturing apparatus suitable for manufacturing a rigid polyurethane foam molded article.

FIG. 2 is a top view of a manufacturing apparatus suitable for manufacturing a rigid polyurethane foam molded article.

FIG. 3 is a diagram showing an example of a configuration of a laminate for molding in which a panel frame and a support surface plate are laminated and a configuration of a stacking device.

FIG. 4 is a diagram illustrating another embodiment of the loading device and the stacking method;

FIG. 5 is a perspective view of a support surface plate.

FIG. 6 is a side view of a conventional apparatus for producing a rigid polyurethane foam molded article using a carrier plate, which includes a multi-stage press and a loader / unloader.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Press machine 3 Support surface plate 5A, 5B Support device 7 Panel frame 11 Loading device 15 Mixing head of a foaming machine

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B29K 75:00 105: 04 B29L 31:10 F-term (Reference) 4F204 AA31 AG03 AG20 AH48 AJ02 EA01 EB01 EB13 EB22 EF05 EF27 EF36 EF47 EK07 4J034 BA00 CA00 HA01 NA00 QB16 QC01 QD06 RA06

Claims (2)

[Claims] 1. A method for producing a rigid polyurethane foam molded article having a panel frame and a rigid polyurethane foam foam filled therein, the panel frame placing step of placing the panel frame on a support platen, A loading step of laminating a supporting platen on which a panel frame is placed to form a laminate for molding, injecting a rigid polyurethane foam foaming stock composition into the panel frame under pressure by a press of the laminate for molding, and foaming. A step of injecting an undiluted polyurethane solution to be filled and releasing, and a step of releasing the pressurized and laminated layers to take out the molded rigid polyurethane foam molded article, wherein the supporting platen has heating means, The placing step, the loading step, and the unloading step are performed at at least two places around the press, and the at least two
When the stacking process is performed at one of the locations and the forming laminate is set on the press, and the polyurethane stock solution injection process is performed, the unloading process and the panel frame mounting are performed at other locations. A method for producing a rigid polyurethane foam molded article that performs a placing step and a loading step. 2. An apparatus for producing a rigid polyurethane foam molded article having a panel frame and a rigid polyurethane foam foam filled therein, comprising at least a press, a foaming machine, a plurality of supporting stools, and a periphery of the press. A loading device for supporting and moving the support platen, and at least two support devices capable of mounting the support platen, wherein the support platen has a heating means, and the The panel frame can be disposed on a support device, the panel frame is placed on the support platen on the support device, and the support platen on which the panel frame is placed is laminated by the loading device to form a laminate for molding. Body and
Injection, foaming, and filling of the rigid polyurethane foam foam stock solution composition into the panel frame by the foaming machine under the pressure of the press machine of the molding laminate, and injection of a polyurethane stock solution into a hard polyurethane foam molded body. The molding laminate after completion of the injection of the undiluted polyurethane solution is configured to be unloaded by the loading device on the support device, and on one of the at least two support devices. The molding laminate formed in the above is disposed in the press machine, and when the polyurethane undiluted solution is being injected, the rigid polyurethane foam molded article is taken out by unloading on another supporting device, and the supporting is performed. Placement of the panel frame on a surface plate, and a rigid polyurethane foam molded body configured to be capable of forming a molding laminate by lamination of a support surface plate manufacturing device.