JP2008265022A - Production equipment for rigid polyurethane slab and production method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide production equipment for a rigid polyurethane slab capable of suppressing the waste of a material considering a contraction allowance in a foam molding of the rigid polyurethane slab. <P>SOLUTION: In the rigid polyurethane slab production equipment, polyurethane foam raw liquid is discharged on the undersurface material, and while the upper surface material 3 is supplied on the upper surface of the undersurface material, these are conveyed to cure the polyurethane foam raw liquid, and cut it into a predetermined length. The production equipment for the rigid polyurethane slab is equipped with a foam conveying part for conveying the rigid polyurethane slab while performing a foam processing of the discharged polyurethane foam raw liquid. The foam conveying part is equipped with a double conveyor 7 positioned at the lower side or the upper and lower side of the rigid polyurethane slab, and a block conveyor 9 which is positioned at both side parts of the rigid polyurethane slab and has pressed surfaces 9b for pressing both the end parts in the width direction. The clearance between the pressed surfaces 9b facing each other is set so that the upper part of the rigid polyurethane slab is wider than the bottom part thereof. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a rigid polyurethane slab manufacturing facility and a hard polyurethane slab manufacturing equipment that discharges polyurethane foam stock solution onto the lower surface material, conveys the polyurethane foam stock solution while supplying the upper surface material to the upper surface, and cures the polyurethane foam stock solution and cuts it to a predetermined length. The present invention relates to a polyurethane slab manufacturing method.

  Such hard polyurethane slabs are widely used as heat insulating materials for various buildings, exterior materials for LNG tanks, household appliance materials, and the like because of their light weight and excellent heat insulation properties. In producing such a rigid polyurethane slab, generally, a polyurethane foam stock solution is continuously supplied between upper and lower surface materials such as kraft paper, which are supplied to be opposed to each other by a conveyor, and foamed and cured. A block-shaped hard polyurethane slab is manufactured by forming a long rigid polyurethane slab foam and cutting it to a predetermined length of about 1 to 2 m using a cutting means such as a cutter or saw while transporting it with a conveyor. (For example, see Patent Documents 1 and 2 below).

Such a block-like hard polyurethane slab is cut out into a plurality of slab products in the thickness direction after production using a cutter or a cutter having nichrome wires arranged at a constant pitch interval.
JP 2005-132046 A JP 2006-248034 A

  FIG. 5 shows a cross-sectional shape of the rigid polyurethane slab 100 manufactured as described above. Not all portions of this cross-sectional shape are used as a slab product, but a part indicated by diagonal lines (shown by reference numeral 101) is used as a slab product. The reason is that the density of the polyurethane foam stock solution is different between the bottom and the top, and the density tends to be lower at the top, so that the dimensions change due to shrinkage after completion of foam curing. This shrinkage phenomenon is particularly likely to occur at both ends of the upper portion shown by the drawing number 100a, and the overall cross-sectional shape is such that the upper width dimension W1 is smaller than the bottom width dimension W2.

  Therefore, in order to obtain a slab product having a predetermined width dimension, it is necessary to manufacture in consideration of the shrinkage allowance. Since the shrinkage margin must be determined based on the upper portion where the amount of shrinkage is large, when the shrinkage margin at the bottom is taken as a reference, it is necessary to take a considerably large shrinkage margin, resulting in a lot of waste of material.

  The present invention has been made in view of the above circumstances, and the problem is that, in foam molding of a rigid polyurethane slab, a rigid polyurethane slab manufacturing facility and a rigid polyurethane slab manufacturing capable of suppressing waste of material while considering a shrinkage allowance Is to provide a method.

In order to solve the above problems, the hard polyurethane slab manufacturing equipment according to the present invention is:
In the rigid polyurethane slab manufacturing equipment that discharges polyurethane foam stock solution on the lower surface material, cures the polyurethane foam stock solution by feeding them while supplying the upper surface material on its upper surface, and cuts it to a predetermined length,
Equipped with a foam conveyance part for conveying the rigid polyurethane slab while foaming the discharged polyurethane foam stock solution,
This foam conveyance part
A first conveyor device located below or above and below the rigid polyurethane slab;
A second conveyor device positioned on both sides in the width direction of the hard polyurethane slab and having a pressing surface that presses both ends in the width direction;
The space between the pressing surfaces facing each other in the width direction is set so that the upper portion is wider than the bottom portion of the hard polyurethane slab.

  The operation and effect of the rigid polyurethane slab manufacturing facility having such a configuration will be described. When conveying the rigid polyurethane slab in the foam conveying section, a first conveyor device positioned below or above and below the rigid polyurethane slab, and a second that is positioned at both ends in the width direction and presses both ends in the width direction of the rigid polyurethane slab. And a conveyor device. By these first and second conveyor devices, the foaming process is performed while conveying the rigid polyurethane slab. Here, the pair of opposing pressing surfaces of the second conveyor device are spaced from each other at the bottom and the top, and are set so that the top is wider than the bottom. Therefore, the interval is relatively narrowed for the bottom portion where the contraction allowance may be small, and the interval is relatively widened for the upper portion where the contraction allowance is large. Thereby, it is not necessary to take a contraction margin more than necessary at the bottom. As a result, it is possible to provide a hard polyurethane slab manufacturing facility capable of suppressing waste of material while considering a shrinkage allowance in foam molding of a hard polyurethane slab.

  The 2nd conveyor apparatus which concerns on this invention is comprised by connecting many blocks to an endless chain, and it is preferable that the said press surface inclined in this block is formed.

  By forming the inclined pressing surface on such a block, the distance between the bottom and the top can be changed with a simple configuration. For example, if the block is manufactured by resin molding, an inclined surface having an arbitrary shape can be formed.

  It is preferable that the block according to the present invention has a triangular shape as a whole or is partially formed in a triangular prism.

  By using such a triangular prism, an inclined pressing surface can be formed, and a shape that can easily connect the block to the endless chain can be obtained.

  The block according to the present invention is preferably a flat plate having an inclined posture. According to this configuration, the block can be made into a simple shape, and an inclined pressing surface can be formed by supporting the block in an inclined posture.

In order to solve the above problems, a method for producing a rigid polyurethane slab according to the present invention is as follows.
An inclined pressing surface can be formed by inclining the flat plate. Moreover, the cost of a conveyor apparatus can also be suppressed by using a flat plate.
In the rigid polyurethane slab manufacturing method of discharging the polyurethane foam stock solution on the lower surface material, curing the polyurethane foam stock solution by conveying these while supplying the upper surface material on the upper surface, and cutting to a predetermined length,
Having a process of transporting a rigid polyurethane slab while foaming the discharged polyurethane foam stock solution,
In this process,
A rigid polyurethane slab includes: a first conveyor device positioned below or above and below the rigid polyurethane slab; and a second conveyor device positioned on both sides in the width direction of the rigid polyurethane slab and having pressing surfaces that press both ends in the width direction. The distance between the pressing surfaces facing each other in the width direction is set so that the upper part is wider than the bottom part of the hard polyurethane slab.

  The operation and effect of the method for producing a rigid polyurethane slab having such a configuration is as described above. The bottom portion where the shrinkage allowance may be small is relatively narrow, and the upper portion where the shrinkage allowance is large is relative. Increase the spacing. Thereby, the rigid polyurethane slab manufacturing method which can suppress the waste of material can be provided, considering the shrinkage allowance.

  A preferred embodiment of a hard polyurethane slab manufacturing facility according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram illustrating a configuration of a rigid polyurethane slab manufacturing facility 1 as viewed from the side.

  As shown also in FIG. 1, a lower surface material 2 made of paper material (such as kraft paper) is supplied from a lower surface material supply device 12 onto a conveyor (not shown), on which a mixing head 4 (raw solution) of a foaming machine is supplied. After supplying the rigid polyurethane foam stock solution M supplied from the supply unit) by the casting method, the upper surface material 3 made of paper material (such as kraft paper) is continuously supplied from the upper surface from the upper surface material supply device 13 and sandwiched. It comes to be in the shape. At that time, in order to make the hard foamed polyurethane slab into a predetermined shape, a plate shape as a pressing member is formed on the upper surface of the upper surface material 3 at a position where the hard polyurethane foam concentrate M discharged onto the lower surface material 2 is foamed. The mat 6 is placed. Thereby, it is possible to prevent an irregular convex bulge from occurring on the upper surface of the upper surface material 3 due to non-uniform foaming. The upper surface material 3 continuously supplied from the upper surface material supply device 13 is coated on the upper surface of the hard polyurethane foam stock solution M in the middle of curing through the guide rolls 10 and 11.

  Although not shown in FIG. 1, a bending guide roll is also provided that raises both widthwise side portions 2 </ b> A of the lower surface material 2 that is horizontally conveyed with respect to the bottom surface portion 2 </ b> B (see FIG. 3).

  An example of the hard polyurethane foam stock solution composition is a combination of Soflan stock solution P-201-5 (isocyanate component) / 314-57C (polyol component) (manufactured by Toyo Tire & Rubber Co., Ltd.), but is not limited thereto. is not.

  A heating oven 8 (corresponding to a foam conveying section) having a hard polyurethane foam undiluted solution M between upper and lower surface materials so that the hard polyurethane slab has a predetermined thickness and provided with a double conveyor 7 (corresponding to a first conveyor device). The foamed and hardened polyurethane P is obtained by being foamed and cured, and at the downstream side thereof, a rigid foamed polyurethane having a predetermined length is produced by cutting in the width direction by a cutting means (not shown) such as a cutter or a saw. . The size of the fixed-size rigid foamed polyurethane slab is not particularly limited, but usually has a wide range of uses having a width of 900 to 1500 mm, a thickness of about 150 to 650 mm, and a length of about 1200 to 2000 mm.

  Although not shown, the double conveyor 7 is provided with a large number of solid plate-like slats continuously along the length of the endless chain. These slats have a flat pressing surface. The slat can be constituted by coating the surface of the metal with a resin such as polyethylene or polytetrafluoroethylene in addition to a metal such as iron, aluminum, and stainless steel.

  FIG. 2 shows a cross-sectional view of the inside of the heating oven 8, and a block conveyor 9 (corresponding to a second conveyor device) that conveys while pressing both ends in the width direction of the hard polyurethane slab is provided. The block conveyor 9 is provided at both ends, but the structure is the same. The block conveyor 9 is provided with a number of robust blocks 9a continuously along the length of the endless chain. These blocks 9a are formed with pressing surfaces for pressing the hard polyurethane slab from the side surfaces. The block 9a can be configured by coating the surface of the metal with a resin such as polyethylene or polytetrafluoroethylene in addition to a metal such as iron, aluminum, and stainless steel. The block 9a is mounted on and connected to an endless chain.

  As shown in FIG. 2, the block conveyor 9 is supported by a pair of rollers 14 installed at front and rear positions in the transport direction. Moreover, the drive direction of the block conveyor 9 is as shown by the arrow of FIG. 2, and it drives in the state synchronized with the double conveyor 7 arrange | positioned up and down. Thereby, the belt-like hard polyurethane slab P is conveyed from the left side to the right side (arrow direction) shown in FIG.

  Next, a specific shape of the block 9a constituting the block conveyor 9 will be described with reference to FIG. As shown in the figure, the block 9a is a triangular prism having a triangular cross section, and includes an inclined pressing surface 9b. Due to the pressing surface 9b, the interval Y1 at the top is wider than the interval Y2 between the pair of pressing surfaces 9a facing each other at the bottom of the hard polyurethane slab to be manufactured.

  As shown in FIG. 1, since the polyurethane foam stock solution is discharged onto the lower surface material 2, the density of the polyurethane stock solution is different between the bottom and the top, and the density tends to be lower at the top. Therefore, the shrinkage after the end of foam curing causes a shrinkage phenomenon, particularly at both upper end portions as shown in FIG. Therefore, in order to obtain a slab product having a predetermined width dimension, it is necessary to manufacture in consideration of the shrinkage allowance. When the pressing surface 9b of the block 9a is set to be vertical, the contraction allowance must be determined based on the upper part where the contraction amount is large. That is, it is necessary to increase the width dimension and the thickness dimension, and as a result, a contraction allowance is taken more than necessary at the bottom, resulting in a lot of material waste.

  Therefore, if the block 9a as shown in FIG. 3 is used, it is not necessary to take a shrinkage allowance more than necessary at the bottom, and an appropriate amount of shrinkage allowance can be taken depending on the location, which is a waste of material. Can be suppressed.

  FIG. 4 is a diagram showing another embodiment of the block 9a. FIG. 4A is a configuration example in which an auxiliary block 9a 'is coupled to the inside of the flat plate block 9a, and a pressing surface 9b is formed on the auxiliary block 9a'. The auxiliary block 9a 'has a triangular prism shape partially, and the bottom surface is perpendicular to the pressing surface 9b, but the vicinity of the upper portion forms an inclined surface. The flat plate block 9a and the auxiliary block 9a 'may be formed as a single block.

  FIG. 4B is an example in which an inclined pressing surface 9b is configured by inclining a block 9a formed of a flat plate. Various modifications other than those described above are conceivable. For example, the cross-sectional shape of the inclined surface may be formed in a curved shape instead of a linear shape. The specific shape of the pressing surface 9b can be appropriately determined according to the mode when the shrinkage occurs.

  Next, specific examples will be described. For example, when the width of the slab product is 1000 mm, conventionally, the foamed dimension (width dimension of the rigid polyurethane slab) is 1080 mm at the bottom and the top. If the blocks 9a and 9a 'shown in FIG. 4A of the present invention are used, the upper portion can be 1080 mm, the center portion can be 1040 mm, and the bottom portion can be 1040 mm. Incidentally, regarding the thickness dimension, when the slab product is 500 mm, the foaming dimension is 550 mm, and when the length dimension is 2000 mm, the foaming dimension is 2080 mm. About thickness and length, it has the same relationship as before.

According to the above specific example, lather volume for one slab product where conventional was 1.235M ^3, next 1.205M ³ according to the present invention, it is possible to reduce the waste of materials.

<Another embodiment>
In this embodiment, although the 1st conveyor apparatus is arrange | positioned up and down, you may make this into only the downward direction and open | released the upper part.

  For the upper and lower face materials, other materials may be used instead of kraft paper.

Schematic showing the configuration of the rigid polyurethane slab manufacturing facility as seen from the side Cross section showing the configuration of the block conveyor Diagram showing block shape of block conveyor The figure which shows another embodiment of a block Diagram explaining the problems of the prior art

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hard polyurethane slab manufacturing equipment 2 Lower surface material 3 Upper surface material 4 Mixing head 7 Double conveyor 8 Heating oven 9 Block conveyor 9a Block 9b Press surface

Claims (5)

In a rigid polyurethane slab manufacturing facility that discharges polyurethane foam stock solution on the lower surface material, transports these while supplying the upper surface material on the upper surface, cures the polyurethane foam stock solution, and cuts it to a predetermined length.
Equipped with a foam conveyance part for conveying the rigid polyurethane slab while foaming the discharged polyurethane foam stock solution,
This foam conveyance part
A first conveyor device located below or above the rigid polyurethane slab;
A second conveyor device positioned on both sides in the width direction of the hard polyurethane slab and having a pressing surface that presses both ends in the width direction;
A hard polyurethane slab manufacturing facility characterized in that an interval between the pressing surfaces facing each other in the width direction is set so that an upper portion is wider than a bottom portion of the hard polyurethane slab.   2. The rigid polyurethane slab according to claim 1, wherein the second conveyor device is configured by connecting a number of blocks to an endless chain, and the inclined pressing surface is formed on the blocks. production equipment.   The rigid polyurethane slab manufacturing equipment according to claim 2, wherein the block has a triangular prism as a whole or is partially formed into a triangular prism.   The hard polyurethane slab manufacturing equipment according to claim 2, wherein the block is a flat plate having an inclined posture. In the rigid polyurethane slab manufacturing method of discharging the polyurethane foam stock solution on the lower surface material, curing the polyurethane foam stock solution by conveying these while supplying the upper surface material on the upper surface, and cutting to a predetermined length,
Having a process of transporting a rigid polyurethane slab while foaming the discharged polyurethane foam stock solution,
In this process,
A rigid polyurethane slab includes: a first conveyor device positioned below or above and below the rigid polyurethane slab; and a second conveyor device positioned on both sides in the width direction of the rigid polyurethane slab and having pressing surfaces that press both ends in the width direction. And the distance between the pressing surfaces facing each other in the width direction is set so that the upper part is wider than the bottom part of the hard polyurethane slab.

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