KR860001112B1 - Manufacture of urethane foam body - Google Patents

Manufacture of urethane foam body Download PDF

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Publication number
KR860001112B1
KR860001112B1 KR1019830003338A KR830003338A KR860001112B1 KR 860001112 B1 KR860001112 B1 KR 860001112B1 KR 1019830003338 A KR1019830003338 A KR 1019830003338A KR 830003338 A KR830003338 A KR 830003338A KR 860001112 B1 KR860001112 B1 KR 860001112B1
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South Korea
Prior art keywords
urethane foam
urethane
door
mold
time
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KR1019830003338A
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Korean (ko)
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KR840005389A (en
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타까아끼 요시다
세이시찌 사까모또
쓰네오 가미사로
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가부시기 가이샤 도시바
사바 쇼오이찌
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Publication of KR840005389A publication Critical patent/KR840005389A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
    • B29C44/1228—Joining preformed parts by the expanding material
    • B29C44/1233—Joining preformed parts by the expanding material the preformed parts being supported during expanding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/20—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for porous or cellular articles, e.g. of foam plastics, coarse-pored
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/02—Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2075/00—Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as moulding material

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Molding Of Porous Articles (AREA)
  • Refrigerator Housings (AREA)

Abstract

Both the mold (6) and the shell member (4) are heated to 40-60 ≰C by circulating hot water through the water pipe(10). Then, expandable urethane resin is fed into the shell member (4) and is foamed. After the tack-free time of the urethane foam passes, the mold (6) is cooled to 5-15 ≰C by circulating cooling water through the pipe (10). Mold (6) is then heated to 40-50 ≰C again after the foaming time passes. The insulating door (1) is produced by filling the shell member (4) with the urethane foam.

Description

우레탄 발포체의 제조방법Method of producing urethane foam

제1도 내지 제3도는 본 발명의 제1실시예를 도시하고,1 to 3 show a first embodiment of the present invention,

제1도는 일부를 파단해서 도시하는 냉장고의 단열도어의 투시도.1 is a perspective view of a heat insulation door of a refrigerator showing a part broken.

제2도는 외각체와 같이 도시하는 성형형의 종단면도.FIG. 2 is a longitudinal cross-sectional view of a shaping mold shown like an outer shell. FIG.

제3도는 우레탄수지의 발포시의 제특성을 도시하는 특성도.3 is a characteristic diagram showing various characteristics when foaming urethane resin.

제4도는 본 발명의 제2실시예를 도시하는 제조공정도이다.4 is a manufacturing process diagram showing a second embodiment of the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

1 : 단열도어(우레탄 발포체) 4 : 외각체1: insulation door (urethane foam) 4: shell

5 : 우레탄포옴 6 : 성형형5: urethane foam 6: molding type

10 : 통수파이프10: water pipe

본 발명은 탈형시간을 단축할 수 있도록 한 우레탄발포체의 제조방법에 관한다.The present invention relates to a method for producing a urethane foam that can shorten the demolding time.

예를들면 냉장고의 단열도어는 도어외판과 도어내측판으로 구성되는 외각체내에 우레탄 발포체(foam)을 충전시켜서 구성하고 있다. 종래 이것은 다음과 같이 제조하고 있었다. 즉, 성형형에 수납한 외각체내에 발포성의 우레탄수지를 주입하고, 그 다음, 예를들어 성형형 전체를 가열로 내에 넣으므로써 우레탄 발포체를 경화반응에 적합한 온도, 예를들면 약 45o로 소정시간 유지하고, 그 다음에 내부에 우레탄 발포체가 충만고화된 외각체를 성형형으로부터 탈형하는 구성이었다.For example, a heat insulation door of a refrigerator is formed by filling a urethane foam in an outer shell formed of a door outer plate and a door inner plate. This was conventionally manufactured as follows. That is, the foamed urethane resin is injected into the outer shell housed in the mold, and then, for example, the urethane foam is predetermined at a temperature suitable for the curing reaction, for example, about 45 ° by placing the entire mold in a heating furnace. It was the structure which hold | maintains time, and then demold | released the outer shell which solidified the urethane foam inside from the shaping | molding die.

그러나 이와같은 종류의 제조방법을 취할 경우 우레탄수지의 주입에서 탈형까지에 필요로 하는 시간은 일반적으로 우레탄포옴의 내압과 이것을 억제하는 우레탄발포체의 골격강도에 의하여 정해진다. 즉우레탄 발포체의 내압은 거의 내부온도로 결정되고, 골격강도는 시간과 같이 경화반응이 진행되므로써 점차적으로 높아지는 경향을 나타내고, 골격강도가 내압에 충분히 근접했을 지점에서 탈형하면 내압으로의한 외각체의 팽융변형의 발생이없다.However, the time required from the injection of the urethane resin to the demolding when using this kind of production method is generally determined by the internal pressure of the urethane foam and the skeleton strength of the urethane foam which suppresses it. That is, the internal pressure of the urethane foam is almost determined by the internal temperature, and the skeletal strength tends to gradually increase as the curing reaction proceeds with time, and when the skeleton strength is demolished at a point where the skeleton strength is sufficiently close to the internal pressure, There is no occurrence of swelling deformation.

그러나 종래의 제조방법에서는 우레탄수지의 경화반응에 의한 반응열에 의하여 우레탄포옴의 온도가 비교적 장시간 고온도로 유지되기 때문에 내압이 높은 상태가 비교적 길게 계속되어, 따라서 탈형까지 장시간이 걸려서 생산성이 열화되는 문제가 있었다. 그러나 그렇다고해서 발포후의 우레탄발포체를 단순히 냉각해서 내압을 내려도, 이번에는 경화반응의 진전이 지연되어 골격강도가 조기에 높아지지 않고 이것도 탈형할때까지장 시간이 걸리고 만다.However, in the conventional manufacturing method, since the temperature of the urethane foam is maintained at a high temperature for a relatively long time due to the reaction heat caused by the curing reaction of the urethane resin, a state in which the internal pressure is high continues for a relatively long time. there was. However, even if the urethane foam after foaming is simply cooled and the internal pressure is lowered, this time, the progress of the curing reaction is delayed and the skeleton strength does not increase prematurely, and this also takes a long time until demolding.

따라서 본 발명의 목적은 우레탄 발포체의 내압을 조기에 저하시키면서 골격강도를 신속히 높이고, 이로 인해 탈형시간을 단축할 수 있고 생산성이 우수한 우레탄 발포체의 제조방법을 제공하는 것이다.Accordingly, an object of the present invention is to provide a method for producing a urethane foam having excellent productivity while reducing the internal pressure of the urethane foam early and rapidly increasing the skeleton strength, thereby shortening the demolding time.

본 발명은 외각체내의 우레탄 발포체를 소정의 시기에 냉각하고 그다음 소정의 시기에 가열하도록하고 이것으로 소정의 단계로까지 반응이 진행한 우레탄 발포체의 온도를 내려서 내압을 조기에 저하시키고, 또 그다음 우레탄 포옴을 가열하므로써 골격강도를 극력조기에 높이는 것에 특징이 있다.The present invention allows the urethane foam in the outer shell to be cooled at a predetermined time and then heated at a predetermined time, thereby lowering the temperature of the urethane foam in which the reaction proceeds to the predetermined step, thereby lowering the internal pressure prematurely, and then urethane. It is characterized by raising the skeleton strength at an early stage by heating the foam.

이하 본 발명의 제1실시예에 대하여 제1도내지 제3도를 참조하여 설명한다. 우선 제1도에 있어서(1)은 최종적으로 얻어진 우레탄 발포체일 냉장고의 단열도어이고, 이것은 도어외판(2)과 도어내측판(3)으로 구성되는 외각체(4)내에 우레탄 발포체(5)를 충만해서 구성한 것이다. 다음에 이 단열도어(1)의 제조시의 상태를 도시하는 제2도에 있어서, (6)은 성형형이고, 이것은 상형(7)및 하형(8)으로 구성되는 상하 2분할형이고, 상하양형(7), (8)간에 상기 외각체(4)를 수용하기 위한 케비티(9)를 구성한다. (10)은 통수파이프이고 이것은 상하양형(7), (8)의 케비티(9)근방에 매몰되고, 도시를 생략한 온수공급장치 및 냉수공급장치에 선택적으로 접속되도록 구성된다.Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 to 3. First, in Figure 1 (1) is a thermal insulation door of the refrigerator of the finally obtained urethane foam, which is the urethane foam (5) in the outer shell (4) consisting of the door outer plate (2) and the door inner plate (3). It is made up with fullness. Next, in FIG. 2 which shows the state at the time of manufacture of this heat insulation door 1, (6) is a shaping | molding die, and this is a top-down 2-split type | mold which consists of the upper mold | type 7 and the lower mold | type 8, A cavity 9 for accommodating the shell 4 is formed between the molds 7 and 8. Denoted at 10 is a water pipe, which is buried near the cavity 9 of the upper and lower shapes 7 and 8, and is configured to be selectively connected to a hot water supply device and a cold water supply device, not shown.

그런데, 상기 구성에서 외각체(4)내에 우레탄포옴(5)를 충만시키기 위해서는 다음과 같이한다. 우선 제2도에 도시하는 상태에 있어서 성형형(6)의 통수파이프(10)에 온수공급장치를 접속하고, 예를들면 약 45℃의 온수를 통해서 성형형(6)과 외각체(4)를 약 45℃로 유지해 놓는다. 그다음 도시를 생략한 우레탄수지 주입장치에 의하여 외각체(4)내에 발포성의 우레탄수지를 주입한다. 이로인해 우레탄 수지가 외각체(4)내에서 발포팽창하여 우레탄 발포체가 되고 외각체(4)의 대락 전역으로 급속도로 확산된다. 이 사이에 외각체(4)는 약 45℃로 유지되고 있으므로 외각체(4)에의 충전성은 양호하다. 또 이 발포반응과 같이 우레탄 발포체는 경화반응이 진행되어서 점차적으로 겔화하고, 또 반응열을 발생해서 우레탄 포움의 온도가 급격히 상승하고 이것에 따라 내압이 높아진다(제3도 실선 참조). 거기에서 우레탄 발포의 겔화가 충분히 진행해서 우레탄 발포체표면의 점착성이 없어지는 이른바 탁프리타임(점착성 소실시간(tack free time) (본 실시예에서는 주입에서 약 55초후)을 경과하고 나서 약 5초후에 성형형(6)의 통수파이프(10)를 냉수공급장치쪽으로 절환하여 통수파이프(10)에 약 10℃의 냉수를 통하여 성형형(6)을 약 10℃로 냉각한다. 이로인해 반응열이 냉각되어 우레탄 발포체가 냉각되므로 우레탄 발포체의 최고온도가 비교적 낮게 억제되고, 따라서 우레탄 발포체의 내압은 제3도 실선으로 표시하는 바와같이 냉각하지 않는 경우(제3도 일정쇄선 참조)에 비해서 조기에 저하하게 된다. 그다음 우레탄 발포체내의 발포가 중지되는 이른바 발포시간(본 실시예에서는 주입에서 약 90초후)을 경과한후 약 10-20초후에 성형형(6)의 통수파이프(10)를 재차 온수공급장치로 접속해서 통수파이프(10)By the way, in order to fill the urethane foam 5 in the outer shell 4 in the said structure, it is as follows. First, in the state shown in FIG. 2, the hot water supply device is connected to the water supply pipe 10 of the shaping | molding die 6, for example, the shaping | molding die 6 and the outer shell 4 through hot water of about 45 degreeC. Hold at about 45 ° C. Then, the urethane resin injection device (not shown) injects the foamable urethane resin into the outer shell (4). As a result, the urethane resin expands and expands in the outer shell 4 to form a urethane foam, and rapidly diffuses throughout the outer shell 4. In the meantime, since the outer shell 4 is maintained at about 45 ° C, the filling property to the outer shell 4 is good. As with this foaming reaction, the urethane foam is gradually gelled as the curing reaction proceeds, and heat of reaction is generated to rapidly increase the temperature of the urethane foam, thereby increasing the internal pressure (see FIG. 3 solid line). Thereafter, about 5 seconds after the so-called tack free time (approximately 55 seconds after injection in this embodiment), the gelation of urethane foam sufficiently proceeds and the adhesiveness of the surface of the urethane foam disappears. The water pipe 10 of the mold 6 is switched to the cold water supply device, and the mold pipe 6 is cooled to about 10 ° C. through the cold water of about 10 ° C. in the water pipe 10. Thus, the reaction heat is cooled. Since the urethane foam is cooled, the maximum temperature of the urethane foam is suppressed to be relatively low, so that the internal pressure of the urethane foam is lowered earlier than the case where it is not cooled as shown by the solid line in FIG. Then, after passing the so-called foaming time (in this embodiment, about 90 seconds after injection) that the foaming in the urethane foam is stopped, the water-passing pipe 10 of the mold 6 is removed after about 10-20 seconds. By connecting to the primary water through the hot water supply pipe 10

제4도는 냉장고의 단열도어를 연속생산하기 위한 본 발명의 제2실시예를 도시하는 것으로 이 제4도에 있어서(11)은 라인 콤베이어이고 이것은 도면중 좌측으로 소정의 시간간격으로 간헐적으로 구동되는 것이다. (12)는 라인 콘베이어(11)상에 재치한 다수의 이송틀이고 이것에는 각각 도어외판(2)을 수납한다. (13)은 우레탄수지 주입장치이고 이것은 라인 콘베이어(11)중 시단부측으로부터 이송틀(12)의 5개분 떨어진 부위에 위치되는 주입포오트 P1에 설치된다. (14)는 가열포오트 P2를 구성FIG. 4 shows a second embodiment of the present invention for continuous production of the insulated door of a refrigerator. In FIG. 4, 11 is a line combier, which is intermittently driven to a left in the drawing at predetermined time intervals. Will be. Numeral 12 denotes a large number of transfer frames placed on the line conveyor 11, and housed therein the door shell 2, respectively. Numeral 13 denotes a urethane resin injection device, which is installed in an injection port P 1 located at a portion five lines away from the start end side of the line conveyor 11. 14 constitutes a heating pot P 2

다음에 상기 구성의 작용을 설명한다. 우선 도어외판(2)을 반입 콘베이어(20)에 재치하고 예열 콘베이어(18)내에 들여보낸다. 그리고 예열 콘베이어(18)에 의하여 약 50℃로 예열되어서 반출 콘베이어(21)에 의하여 송출된 도어외판(2)을 차례로 콘베이어(11)위의 이송틀(12)내에 수납한다. 그러면 라인 콘베이어(11)의 좌측 방향으로의 구동으로 이송틀(12), 나아가서는 도어외판(2)이 주입포오트 P1에 이르러 우레탄 수지주입장치(13)에 의하여 도어외판(2)내에 소정량의 우레탄원액이 주입된다. 그다음 이 도어외판(2)은 가열실(14)내의 가열포오트에이르러 우레탄수지가 발포해서 도어외판(2)내에 충만된다. 그리고 우레탄포움의 탁프리타임이 경과할 무렵이되면 도어외판(2)이 가열실(14)내에서 나와서 온조실(15)내의 냉각포오트 P5에 도달한다. 이곳에서는 압지치구(16)가 약10℃로 냉각되어 있으므로 우레탄 발포체가 약 10℃로 냉각되고 우레탄 발포체의 반응열이 빼앗겨서 내압이 저하된다. 그리고 우레탄 발포체의 발포시간이 경과할때가되면 도어외판(2)이 재가열 포오트 P4에 온다. 이곳에서는 압지치구(16)가 약 45℃로 가열되어 있으므로 우레탄 발포체가 약 45℃로 재가열되고 이것으로 우레탄포움의 경화반응이 촉진되어 표면의 취약화가 방지되는 동시에 골격강도가 높아진다. 그다음 온조실(15)을 나온 이송틀(12)내로 부터 도어외판(2)을 꺼내고, 다시 도어외판(2)에 도어내측판(3)을 장착하므로써 단연도어(1)가 완성된다.Next, the operation of the above configuration will be described. First, the door outer plate 2 is placed in the carrying-in conveyor 20, and is let in in the preheating conveyor 18. As shown in FIG. And the door outer plate 2 preheated by the preheating conveyor 18 to about 50 degreeC, and sent out by the conveying conveyor 21 is stored in the conveyance frame 12 on the conveyor 11 in order. Then, the conveying frame 12 and the door outer plate 2 reach the injection port P 1 by driving the line conveyor 11 in the left direction, and the urethane resin injection device 13 causes the small portion of the conveyance frame 12 to enter the door outer plate 2. A fixed amount of urethane stock solution is injected. Then, the door shell 2 is filled with the urethane resin by foaming urethane resin in the heating chamber 14 to fill the door shell 2. When the tack free time of the urethane foam elapses, the door shell 2 exits from the heating chamber 14 and reaches the cooling pot P 5 in the temperature chamber 15. In this case, since the pressing fixture 16 is cooled to about 10 ° C., the urethane foam is cooled to about 10 ° C., and the heat of reaction of the urethane foam is taken away, thereby lowering the internal pressure. When the foaming time of the urethane foam elapses, the door shell 2 comes to the reheating pot P 4 . In this case, since the pressing fixture 16 is heated to about 45 ° C., the urethane foam is reheated to about 45 ° C., which accelerates the curing reaction of the urethane foam, thereby preventing fragility of the surface and increasing skeleton strength. Then, the door door 1 is completed by taking out the door outer plate 2 from the inside of the transfer frame 12 which exits the temperature chamber 15, and attaching the door inner side plate 3 to the door outer plate 2 again.

본 발명은 이상과 같이 우레탄 발포체의 내압을 조기에 저하시키면서 골격강도의 진행을 촉진시킬 수 있으므로 탈형시간을 단축화할 수 있고 생산성이 우수한 우레탄 발포체의 제조방법을 제공한다.The present invention can accelerate the progress of the skeleton strength while lowering the internal pressure of the urethane foam as described above, thereby shortening the demolding time and providing a method for producing a urethane foam having excellent productivity.

Claims (1)

외곽체내에 발포성의 우레탄 수지를 주입시켜서 우레탄 발포체를 내부에 충만시키는 것에 있어서, 상기 외곽체를 가열시키는 제1공정과 외곽체내에 우레탄수지를 주입시키는 제2공정과, 우레탄 발포체표면의 점착성이 상실된 전후에 이 우레탄 발포체를 냉각시키는 제3공정과, 우레탄발포체의 거품이 일어나는 것이 정지된 전후에 이 우레탄 발포체를 가열시키는 제4공정으로 구성된 것을 특징으로 하는 우레탄 발포체의 제조방법.In filling the urethane foam therein by injecting a foamable urethane resin into the outer body, the first step of heating the outer body and the second process of injecting the urethane resin into the outer body, and the adhesion of the urethane foam surface is lost And a third step of cooling the urethane foam before and after, and a fourth step of heating the urethane foam before and after the foaming of the urethane foam is stopped.
KR1019830003338A 1982-07-27 1983-07-20 Manufacture of urethane foam body KR860001112B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP130855 1982-07-27
JP57130855A JPS5920634A (en) 1982-07-27 1982-07-27 Manufacture of urethane foam body

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KR840005389A KR840005389A (en) 1984-11-12
KR860001112B1 true KR860001112B1 (en) 1986-08-13

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JPS4960362A (en) * 1972-10-17 1974-06-12

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KR840005389A (en) 1984-11-12
JPH035971B2 (en) 1991-01-28
JPS5920634A (en) 1984-02-02

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