JPS60155418A - Method and apparatus for continuously preparing synthetic resin foam - Google Patents

Abstract

PURPOSE:To prepare foam without generating chip waste, by foaming a foamable stock solution in the upwardly directed C-shaped receiving trough of an endless running conveyor to the thickness direction at a foaming speed slower than a free foaming speed and also foaming the same positively to the lateral direction. CONSTITUTION:An eldless running conveyor having an upwardly directed C- shaped long receiving through provided to the upper surface thereof is allowed to run at a constant speed. Said receiving trough consists of a large number of continuous slats 3 and a pair of side plates 4 uprightly provided to both end regions of each slat in a freely detachable manner. A foamable stock solution is continuously supplied to said receiving trough 5 and foaming reaction is performed. The side plates 4 are widened to the lateral direction with the advance of foaming reaction and the foamable stock solution is also positively foamed to the lateral direction while foamed to the thickness direction at a foaming speed slower than the free foaming speed thereof by a loading apparatus 12.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in a method for continuously producing synthetic resin foam and an apparatus therefor.

Conventionally, methods for continuously manufacturing synthetic resin foam such as rigid urethane foam include a bottom conveyor that runs at a constant speed, and a bottom conveyor that is erected on both edges of the top surface and runs at the same speed as the bottom conveyor. A foaming stock solution tube of synthetic resin foam is continuously supplied onto the bottom compare of the long receiving groove formed by the bottom conveyor and the side conveyor. A method has been adopted in which a foaming reaction is carried out in the elongated receiving groove, and the foam is removed from the elongated receiving groove after the reaction is completed.

However, in the above-mentioned conventional method, in the process of producing synthetic resin foam, the free foaming reaction of the foaming stock solution occurs on the strong side that is configured to have sufficient strength to withstand the foaming pressure of 7. Since the bubbles are blocked by the conveyor, the bubbles themselves have a large directionality, and the physical properties of each part of the produced synthetic resin foam are significantly different, and a synthetic resin foam is produced in which large stress remains in the surface area.

Therefore, when it is processed into a board or pipe cover and used as a heat insulating material, it has disadvantages in physical properties, such as significant dimensional changes and cracks, which may be harmful to heat insulation. Furthermore, the manufacturing equipment that carries out the conventional method has a structure with sufficient strength to withstand large foaming pressures (0.1 to [L5 to 9/scale), so the structure is complicated and the operation is complicated. ) υ is also very expensive, and therefore has drawbacks such as high manufacturing costs for synthetic resin foams.In addition, in conventional means, it is not possible to change the spacing of the side conveyors, so the produced synthetic resin When manufacturing insulation materials such as boards and pipe covers by cutting resin foam, it is not possible to select the optimal size synthetic resin foam according to the size and quantity of the board or pipe cover to be manufactured. This results in cutting from an unnecessarily large size, which generates a large amount of cutting waste that has no utility value, resulting in uneconomical use of synthetic resin foam, and requiring a large amount of expense to dispose of the large amount of cutting waste. There are many disadvantages in terms of economics as well.

The present invention has been made to eliminate all of the above-mentioned conventional drawbacks, and provides a method for economically producing a synthetic resin foam of a desired shape having extremely excellent physical properties, and a method for use therein. The purpose is to provide manufacturing equipment.

The continuous production method of synthetic resin foam according to the present invention involves running an endless conveyor having an upwardly U-shaped elongated receiving groove on the upper surface at a constant speed, and forming a synthetic resin foam at the starting end of the elongated receiving groove. A method of continuously producing synthetic resin foam by continuously supplying a stock solution and causing a foaming reaction in a receiving groove, which foams in the thickness direction at a slower foaming speed than free foaming and also in the width direction. It is also characterized by actively foaming.

Furthermore, the synthetic resin foam manufacturing apparatus according to the present invention includes:
An endless running conveyor having an upwardly facing U-shaped elongated receiving groove on its upper surface is run at a constant speed, and a foaming solution of synthetic resin foam is continuously supplied to the starting end of the elongated receiving groove, and foaming occurs within the receiving groove. In an apparatus for continuously producing synthetic resin foam by carrying out a reaction, the upwardly facing U-shaped elongated receiving groove of the endless conveyor has a large number of continuous slats, and stands detachably at both ends of each slat. The pair of side plates expands as the foaming reaction of the foaming stock solution supplied to the U-shaped elongated receiving groove formed by the slats and the side plates progresses, and The side plate is a movable side plate that returns after the synthetic resin foam is removed, and a loading device is arranged in the U-shaped long receiving groove to foam the foaming solution in the thickness direction at a foaming speed slower than that of free foaming. It is characterized by its structure.

Next, the present invention will be described in detail based on the accompanying drawings showing embodiments thereof.

In the drawings, (1) is an endless running conveyor, which is installed at an angle of 0.5° to 6° from the horizontal so that the end portion descends. The conveyor (1) has a large number of slats (3) formed from metal plates, synthetic resin plates, wood materials, etc. fixed to a roller conveyor chain (2) with an attachment, and is used to control the progress of the foaming reaction of the foaming stock solution of the synthetic resin foam. A pair of L-shaped side plates (4) (4), which expand in width and return after the generated synthetic resin foam detaches, are erected on the upper surface of the slat (3) in a removable manner at a required interval. An upwardly U-shaped elongated receiving groove (5) is formed. The conveyor (1) is stretched over a driving tin rocket (7) and a driven sprocket (8) mounted on a pace structure (6). 2) Add the base structure (
6) The mechanism is configured to move the elongated receiving groove (5) in the direction of the arrow.

The opposite side plate (4) (4) is made of a metal plate, a synthetic resin plate, a wooden material, etc. and has a width that is the same as the width of the slat (3). The opposite side plate (41(4)) is fixed to the upper surface of the slat (3) using a removable fixture, and the mutual spacing between them can be changed. It can be easily manufactured.

Opposing side plate (4) (4) is, for example, a means for fitting both sides of the bottom plate Ql of the side plate into guides (9) provided at predetermined positions on the slat (3), or The slats (3) are fixed by appropriate means such as fitting the bolts provided at the positions into the long holes provided on the bottom plate (11) of the side plates.
A foaming stock solution of synthetic resin foam is installed on the top of the conveyor (1) so as to be able to slide freely in the width direction of the conveyor (1). As the foaming reaction progresses, the distance between the erected parts expands due to the foaming pressure, and when the generated synthetic resin foam leaves the elongated receiving groove (5), the foaming pressure increases until the foaming solution is supplied next time. , it will automatically return to its original position. The means for adjusting the distance between the side plates (4) (4) is not limited to the above-mentioned means. ) and the side plates (4) (4) are connected to each other, and the distance between the side plates is expanded at the required speed according to the foaming reaction of the foaming stock solution, and the mechanism returns to the original position when the synthetic resin foam is detached. Reference numeral 017J is a loading device, which is placed on the upper surface of the foaming stock solution where the foaming reaction is progressing at a predetermined position above the long receiving groove (5), and foams in the thickness direction (upward). The loading device is configured with a mechanism that controls the foaming speed at a different speed than that in free foaming.
1, and a number of slats attached to it) 714, is stretched around the driving sprocket α and the driven sprocket ae, runs in the same direction and at the same speed as the conveyor (1), and is controlled by the flexural movement of the conveyor chain. The drive sprocket a! 9 and the driven sprocket) The distance between Q [9 is sufficiently long, and it follows the shape of the top surface of the foaming solution that changes moment by moment as the foaming solution of the synthetic resin foam undergoes the foaming reaction. The slats (3) and side plates (4) (4) of the conveyor (1), the slats (14) of the loading device (a), without deformation due to their rigidity etc.
) is constructed with a mechanism that always maintains the cross section in a rectangular shape. good.

(17a) (17b) is a synthetic material produced by applying a mold release agent such as wax to the surface of the slat (3), a4, and side plate (4L (4)) using a mold release agent applicator. The resin foam is configured so that it can be separated from these without receiving physical or shape damage.
As mold release treatment means, self-releasing slats coated with fluororesin (3), Q4), and side plates (4) are used.
, (4) may be used for mold release treatment. In the illustrated example, a mold release material αυ made of a flexible sheet material such as plastic film or paper that does not allow the foaming solution to permeate is further disposed on the starting end side of the conveyor (1) so that it can be freely fed out. While being bent along, it is supported by a conveyor (1) and sent forward to continuously cover the inner surface of the elongated receiving groove (5). Press down and slat the mold release material part) (Feed forward with 14J and slat it continuously)
(The inner surface of the slat (3) (14) is coated with a release material (11), or the above-mentioned means are appropriately selected.
), and the inner surfaces of the side plates (4) and (4) that are in contact with the foaming stock solution during the foaming process may be subjected to mold release treatment.

(11 is a discharge nozzle for continuously supplying the foaming stock solution of the synthetic resin foam to the bottom of the long receiving groove (5), which is installed at a predetermined position above the starting end of the long receiving groove (5), This is v
Distribute the foaming stock solution uniformly in the width direction of the bottom of the long receiving groove (5) by using several units, or discharging it from a long slit, or using a means of moving the nozzle left and right. It is configured with a mechanism to do this. The handle is a transport roll for transporting the generated synthetic resin foam forward. Thus, the drive roll (7) of the conveyor (1) is activated to move the long receiving groove (5) in a predetermined direction in the direction of the arrow. While running at a speed of , a synthetic resin foam such as polyurethane foam, polyisocyanate 7 ohm, phenol to resin 7 ohm 1 is discharged from the discharge nozzle to the bottom of the long receiving groove (5) which has been subjected to mold release treatment. When the foaming stock solution 0η of the body is uniformly distributed and continuously supplied, the foaming reaction starts after about 10 to 200 seconds, and the thickness increases along the wall surface of the side plate (41, (4) that has been released). Foaming rises in the direction (upward) and the foaming rate is 4.
When it reaches 0 to 80%, the loading device α2 is activated. After that, foaming occurs while free external foaming in the thickness direction is controlled by the loading device a'a, and as a result, the expandable side plates (4), (4) move outward and the foaming solution is spread in the width direction. It foams aggressively.

Then, the foaming reaction progresses while foaming in both directions,
After 30 seconds to several minutes, the foaming reaction will be completed and the conveyor (
The synthetic resin foam (
2′! J is obtained continuously.

The generated synthetic resin foam (when the two are separated, the side plate (four)
), (4) is returned to its original position by the action of the bullet aυ, etc., and if necessary, a mold release process is performed, and the foaming stock solution 0 is returned to its original position.
By feeding the sword into the long receiving groove (5) and causing the foaming reaction to occur in the same manner as described above, the synthetic resin foam (c) can be continuously obtained.

As shown in Fig. 4, the loading device (I) is a large number of loading rollers (H) placed at predetermined positions above the elongated receiving groove (5) so that the upper surface of the foaming stock solution in which the foaming reaction is progressing can come into contact with the loading device (I). ) are placed at appropriate intervals to control foaming in the thickness direction of the foaming stock solution.
A mechanism may be used to control the foaming speed to be slower than the free foaming speed. The load roller (c) described above may use a driving means, but it is not necessary to use a driving means, and the conveyor (1)
) rotates in synchronization with the running of the foaming solution, and the foaming reaction is progressing. Abnormal stress is applied to the foaming solution and the produced synthetic resin foam due to the difference in the upper and lower running speeds, resulting in a decrease in the quality of the produced synthetic resin foam. There is a wandering that prevents it from happening. The loading roll (c) may be subjected to a mold release treatment in the same manner as described above, or may be coated with a fluororesin or the like to be a self-release roller. It is desirable to place it at a position above the elongated receiving groove (5) so that it comes into action when the foaming rate has reached 50%, and the position can be easily determined by examining the foaming reaction characteristics of the foaming stock solution in advance. can be determined.

In addition, the slats (3), (141, side plates (4),
(4) and the surface of the loading roller (c) may be covered with a heat insulating material such as polyethylene foam, which reduces the thickness of the skin produced and makes the foaming solution uneconomical. It is possible to prevent the use of

As described above, according to the present invention, the middle stage of foaming, that is, the exothermic reaction becomes large, and as the internal temperature rises, the foaming speed increases rapidly, and the bubbles begin to expand in the thickness direction (upward). Since the structure is such that the loading device controls free foaming in the thickness direction and at the same time selectively foams in the width direction, the foam is homogeneous and has highly isotropic cells. It is possible to easily obtain a synthetic resin foam that has no residual stress, no weaknesses in use, and has excellent physical properties.Furthermore, according to the present invention, the slats identified in the roller conveyor chain and the slats thereof can be easily obtained. Since a long receiving groove is formed with the side plate that stands upright and can be expanded in width, there is no need for a large and rigid side conveyor that was indispensable with conventional methods, and the manufacturing equipment is simple. Moreover, it has a compact structure, low friction, and is extremely easy to operate and maintain, so that the manufacturing cost of synthetic resin foam can be significantly reduced.

In addition, according to the present invention, the loading device is operated on the upper surface of the foaming stock solution whose shape is not determined while the foaming reaction is progressing, and the width is regulated by the removable side plate, so that the foam has a rectangular cross section of a desired size. Because synthetic resin foam can be manufactured extremely easily and at low cost, it is possible to minimize the generation of cutting waste when manufacturing insulation materials such as wood boards and pipe covers. It can significantly reduce manufacturing costs and has the effect of making the most effective use of a limited and valuable resource.

[Brief explanation of the drawing]

FIG. 1 is a side view of a synthetic resin foam manufacturing apparatus showing one embodiment of the present invention, FIG. 2 is a plan view thereof, and FIG.
In the figure, (A-A) is a cross-sectional view of fil, and No. 4 is a side view of a manufacturing apparatus showing another embodiment of the present invention. (1)... Endless running conveyor (3)... Slat (4), (4)... Side plate (5
)...Long receiving groove a3...Loading device α...Slat a! ...Discharge nozzle c2 area... Loading roller Patent applicant Nichias Co., Ltd. Procedural amendment (spontaneous) 1 Indication of the case Patent application No. 11079/1982 2 Name of the invention Continuous manufacturing method and apparatus for synthetic resin foam 3. Relationship with the case of the person making the amendment Patent applicant name: Nichias Co., Ltd. 4. Agent address: 752-ku Marunouchi Building, 2-4-1 Marunouchi, Chiyoda-ku, Tokyo 100 5. Details subject to amendment Column for detailed description of the invention and Figure 1 Japanese Patent Application No. 1983-
Contents of amendment No. 117079 1. "On the physical properties of" on page 3, line 16 of the specification is corrected to "j on physical properties." 2. "Toyama" on page 4, line 2 of the specification is corrected as "r". 3. On page 11, line 14, ``200 seconds'' is corrected to ``1300 seconds''. 4. Change ``30 seconds to several minutes later'' to ``10'' on page 12, line 3.
0 seconds to 10 minutes later.'' 5. Correct the numbers in Figure 1 as shown in the attached manuscript.

Claims (2)

[Claims] (1) An endless running conveyor having an upwardly facing U-shaped elongated receiving groove on its upper surface is run at a constant speed, and the foaming solution of the synthetic resin foam is continuously supplied to the starting end of the elongated receiving groove. A method for continuously producing synthetic resin foam by carrying out a foaming reaction within the foam, which is characterized by foaming in the thickness direction at a slower foaming speed than free foaming, and actively foaming in the width direction as well. A continuous manufacturing method for synthetic resin foam. (2) An endless running conveyor having an upwardly facing U-shaped elongated receiving groove on its upper surface is run at a constant speed, and a foaming solution of synthetic resin foam is continuously supplied to the starting end of the elongated receiving groove. In an apparatus that continuously manufactures synthetic resin foam by carrying out a foaming reaction inside the conveyor, the upwardly facing U-shaped elongated receiving groove of the endless conveyor is connected to a large number of continuous slats and to both end portions of each slat. It consists of a pair of side plates that are freely erected, and the pair of side plates expand in width as the foaming reaction of the foaming solution supplied to the U-shaped elongated receiving groove formed by the slats and the side plates progresses. , and is a movable side plate that returns after the generated synthetic resin foam is released, and is loaded with a force to foam the foaming stock solution in the thickness direction at a foaming speed slower than that of free foaming in the U-shaped long receiving groove. 1. An apparatus for producing synthetic resin foam, characterized in that the apparatus is arranged.