KR910007366B1 - Method for manufacturing form panels - Google Patents

Abstract

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Description

Manufacturing method of concrete frame plate

BRIEF DESCRIPTION OF THE DRAWINGS The schematic diagram of one embodiment of an apparatus for practicing the method of the present invention.

* Explanation of symbols for main parts of the drawings

1: wood board 2: powder spreader

3: powder of polyolefin resin having adhesiveness 4: heating device

5: pressing roll 5 ': receiving roll

6: second powder spreader

7: powder of non-adhesive polyolefin resin

8: belt press device 9: steel belt

10: tension roll 11: second pressure roll group

12: second receiving roll group 13: partition wall

14: heat melting area 15: cooling area

16 belt heating device 17 cooling device

18: auxiliary belt heating device.

The present invention relates to a method for producing a concrete mold plate, in which a resin film is formed on a surface of a wooden plate used for a concrete mold.

It is well known that a polyolefin-based resin film is formed on a wooden board, and the polyolefin-based surface material exhibits chemical stability and cures the raw concrete in the most stable state. Generally, after a polyolefin resin is molded into a film or sheet shape, a method of adhering to a wooden board using an adhesive is taken. However, in order to industrially mass-produce concrete-type plates using the above method, first, a separate film must be prepared, and the film must be properly cut and adhered to a wooden board using an adhesive. There are many losses because they cut and cut off the ear of the film. In addition, the cost increases by using an adhesive. For this reason, the present inventors devised a method of using a powdered resin to invent a method of eliminating the loss of deafness of a film and not requiring an adhesive, and a method of reducing the cost, which is first disclosed in Japanese Patent No. 1380308 in Japan. (Patent No. 61-46289) was obtained.

However, the manufacturing method according to Japanese Patent No. 1380308 needs to melt the resin by heating with a heating apparatus in two steps. Moreover, although far infrared rays are used as a heating apparatus, there is a demand that far infrared heating apparatuses are expensive and at the same time not able to be processed equally to one but not two because of the reduction in manufacturing cost. In addition, in the non-adhesive polyolefin resin serving as the surface material, the pressurization time by the second heating roll is extremely short, so that when the resin is extremely low in fluidity, complete fluidity cannot be obtained, and the resin surface after finishing is resin. There is a problem that the traces of particles remain and the aesthetic appearance is not good and smooth finishing is not possible. In particular, when a smooth surface finishing is desired on a wooden board where small bumps are scattered on the surface, such as a wafer board, the resin is sufficient. It needs to be filled to completely fill the recess. In the case where the thermoplastic resin is to be heat-sealed on a wooden board, it is difficult to avoid the evaporation of moisture in the wood. As described above, the pressurization time by the heating roll is extremely short, and After the thermoplastic resin surface is open until it enters the pressure roll, the adhesive resin layer in which the water vapor generated in the wood plate is in the molten state passes through the heating roll and then enters the pressure roll. It exits and again breaks through the non-adhesive resin layer thereon to form branch holes, leaving a trace even after the branch holes are roll-molded by a pressure roll. Moreover, even after rolling by a press roll, water vapor | steam generate | occur | produces. In this case, since the resin surface starts to crystallize and solidifies, the resin surface does not penetrate all the resin layers but stays in the resin layer and remains as bubbles after cooling. Such traces of branching holes, bubbles, and the like remain as internal stresses after cooling and solidifying the resin layer, and cause cracks after a long time.

In order to solve the problems of the method for manufacturing a concrete die plate according to Japanese Patent No. 1380308, a polyolefin-based copolymer resin (hereinafter simply referred to as an adhesive resin) powder having adhesiveness on the surface of a wooden plate is prepared. Sparging, heating it to melt the resin, pressurizing with a pressure roll to heat-bond the resin to the plate surface, and then forming an adhesive layer having air permeability by the adhesive resin on the surface of the wooden board; Non-adhesive polyolefin resin (hereinafter simply referred to as polyolefin resin) powder having compatibility with the resin is sprayed, and in the present invention, the inlet is formed by a partition wall provided at the central portion in the longitudinal direction of the belt-type press apparatus. The first half from the end to the partition wall to the heat-sealing area, and the second half from the partition wall to the belt end exit After passing through the belt-type press device, which is divided into cooling areas, press the water surface with the belt and maintain the state as it is, while heating the outer surface of the belt in the heat-sealing area to pressurize the resin while melting, flowing and fusion, and then The present invention has been developed a method of manufacturing a concrete frame plate by forming an adhesive resin layer on the upper surface of the adhesive resin layer by performing pressure molding and cooling continuously in the cooling area.

Since the powder of adhesive resin was first sprayed on a wooden board, heated, and completely fused to the plate surface with a pressure roll, the polyolefin resin to be sprayed thereon requires only complete melt flow, that is, filming. Immediately without heating by infrared rays or the like, it is guided to the heat-sealing area of the belt-type press apparatus, presses the surface of the water on the surface of the high temperature belt, and is conveyed while maintaining the state as it is. By melting and simultaneously pressing several times with the pressure rolls installed between the tension rolls, heating and pressurization are performed in parallel to save time, and the resin is completely melted and flowed into the gaps in the convex to fill the resin and at the same time, As a result, complete filming is performed. As it continues to enter the cooling area, it is rapidly cooled by cold water and / or cold air on the outer surface of the belt and repeatedly pressurized, and the resin is cooled to solidify below the crystallization temperature and solidified within 20 to 40 seconds. At the end, the belt surface and the water surface are separated and demolded. On the way back, the lowered belt enters the hot melt area, rapidly rises in temperature, and returns to the inlet of the apparatus. In this case, when the increase in the belt temperature is insufficient, an auxiliary heating device is used.

EXAMPLE

BRIEF DESCRIPTION OF THE DRAWINGS The drawings are schematic diagrams of devices used for the purpose of practicing the method of the present invention.

The wood board 1 is conveyed by the corrocon bearing 19, and the powder 3 of the polyolefin copolymer resin which has adhesiveness on the surface is sprayed by the powder spreader 2, and then the heating apparatus 4 is carried out. After being heated while passing through the lower part of, and pressurized by the first press roll 5 and the receiving roll 5 ', the adhesive resin and the wooden board are adhered.

Subsequently, while passing through the lower part of the powder spreader 6, the powder 7 of non-adhesive polyolefin resin is spread | spreaded on adhesive resin, and then immediately introduce | transduced into the belt-type press apparatus 8. In the belt type press 8, tension rolls 10 and 10 are tensioned at both ends of the steel sheet belt 9 provided by endless, and a plurality of second pressure rolls are formed between the tension rolls 10 and 10. (11) .. A group is provided, and a second receiving roll (12) .. group is provided below the pressing roll (11). The partition wall 13 is provided so that the first half of the belt-type press device from the inlet end to the partition wall is heated to the fusion area 14 and the second half from the partition wall 13 to the outlet of the belt end is cooled in the cooling area 15. Therefore, the belt heating device 16 between the pressure rolls 11 and 11 in the heat-sealing area 14 and the cold water and / or cold air in the cooling area 15 are belted. A cooling device 17 is provided to blow the surface to cool the resin layer, and 18 is an auxiliary belt heating device.

Example 1

A commercially available plywood with a thickness of 12 millimeters 5 fryer is conveyed by a corocone bearing 19 having a delivery speed of 3 m / min, and Mitsui Sekiyu Chemical Co., Ltd. , NS-100, 50-150 mesh powder (3) using a mechanical spraying powder spreader (2), uniformly sprayed at a rate of 30 g / M ² , and then as a heating device (4) infrared ray of 6m length Heated using a heating furnace, pressurized with the first pressure roll 5 adjusted to 100 ° C, and then made by Mitsui Seki Oil Kagaku Kogyo Co., Ltd. Hi-Jex, 8200CP, 50-200 mesh The resin powder 7 was uniformly sprayed onto the adhesive resin at a rate of 150 g / M ² using a powder electrostatic coating machine as the second powder spreader 6. Then, it is immediately sent to the heat fusion area 14 of the belt-type press apparatus 8. The steel plate belt 9 of the belt-type press apparatus 8 is a steel plate of 1.0 millimeter carbon steel thickness, which is installed in an endless 13 ml extension. The resin temperature at the time of entering the heat fusion area was 55 ° C, and the surface temperature of the steel plate belt 9 was 180 ° C.

Pressing the surface of the resin with the steel sheet belt 9 and pressing it using the second pressurized flow group 11 and the receiving roll group 12 disposed thereon while maintaining the state as it is, and then into the heat-sealing area 14. It enters into the cooling area 15 partitioned by the partition wall 13 at about 8m, and press-molding while quenching the belt by cold water and cold air, and it cools to below the crystallization temperature at the exit of a steel plate belt. When it is separated from the belt surface, it is sufficiently solidified and released smoothly without sticking. In this way, even when 8200CP, a resin having a low flowability of 0.03, is used, it can be perfectly shaped to provide a smooth surface appearance with good aesthetics.

Example 2

A wafer board having a thickness of 18 millimeters was used as a wood board, and Hyzex 3300FP, 50-200 mesh manufactured by Mitsui Sekiyou Chemical Co., Ltd., was used as powder of a non-adhesive resin. As a result, all of the convex portions (area of 20 square millimeters or less and depth of about 0.1-1.5 millimeters) existing on the wafer board surface were filled with resin, so that aesthetics without scratches were smooth and smooth surface finish was achieved.

In the method of the present invention, the polyolefin-based resin sprayed on the adhesive resin layer formed on the wooden board is pressed using a belt press device to press the surface of the water with a belt, while maintaining the state as it is, while heating, melting, pressure fusion, press forming and cooling In order to carry out the whole process, the infrared heating device for melting the polyolefin resin after spraying was removed. Moreover, since it is direct heating by a belt type | mold press apparatus, the amount of heat for melting resin can be reduced significantly compared with an infrared system. Further, by pressing the resin surface with the belt and maintaining the state as it is, by heating, pressing and fusion in the heat fusion area, each time, i.e., each time of heating and pressure fusion is significantly lengthened, and sufficient fluidity of the resin is obtained. For example, even a highly low grade of water, such as high-density polyethylene having a molecular weight of 300,000 or more, can be freely processed, and a concrete mold plate having excellent toughness and weather resistance can be produced. Even when a resin having a molecular weight of about 150,000 is used, a complete resin coating can be performed even on a concrete mold plate having a poor surface state, for example, a plywood with many cracks and small holes, or a wafer board having many structural parts. In addition, it is possible to fully utilize the wood board, which was previously unsuitable as a concrete mold.

In addition, in the obstacle caused by water vapor, which occurs in wood, a partition wall is provided in the middle of the belt-type press device and partitioned into a heat-sealing area and a cooling area so that the belt is not affected with each other during heating and cooling. While pressing, the resin surface is not released from the process of heating, pressure fusion, press molding, and cooling while maintaining the state as it is. Therefore, in the heat fusion area, since the belt presses the surface of the water and maintains the state as it is, the heating, pressurization, and fusion proceed continuously, so that water vapor does not evaporate to the surface of the water and gradually diverges to the outside through the conduit inside the wood. do. Then, when entering the cooling area, the resin presses, cools, and solidifies, while the belt presses the surface of the resin and the state as it is is maintained. When the resin is solidified, no obstacle due to water vapor occurs. The resin layer heated, pressurized, fused, pressurized and cooled by such a system has effects such as little branching holes or bubbles and no cracking.

Claims (1)

The powder of the non-adhesive polyolefin resin having compatibility with the resin is sprayed on a resin formed by spraying a powder of an adhesive polyolefin copolymer resin on the surface of the wood board and heating and pressing the powder. A belt type press formed by partitioning the first half between the inlet end and the partition wall into a heat-sealed area, and the second half from the partition wall to the exit of the belt end by a cooling area by a partition wall provided in the longitudinal center of the press apparatus. While passing through the apparatus and pressing the water surface with the belt and maintaining the state as it is, the upper surface of the adhesive resin layer is formed by continuously performing all processes of heating, pressing, fusion, and pressing molding and cooling in the heat-sealing area. Of the concrete mold plate, characterized in that to form a non-adhesive resin layer Manufacturing method.

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