JPH0228448B2 - - Google Patents
Info
- Publication number
- JPH0228448B2 JPH0228448B2 JP55113164A JP11316480A JPH0228448B2 JP H0228448 B2 JPH0228448 B2 JP H0228448B2 JP 55113164 A JP55113164 A JP 55113164A JP 11316480 A JP11316480 A JP 11316480A JP H0228448 B2 JPH0228448 B2 JP H0228448B2
- Authority
- JP
- Japan
- Prior art keywords
- foam
- foaming
- box
- heat insulating
- urea
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000006260 foam Substances 0.000 claims description 42
- 238000005187 foaming Methods 0.000 claims description 24
- 239000004202 carbamide Substances 0.000 claims description 20
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 239000011810 insulating material Substances 0.000 claims description 7
- 239000002984 plastic foam Substances 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 229920005989 resin Polymers 0.000 claims description 2
- 239000011347 resin Substances 0.000 claims description 2
- 239000012774 insulation material Substances 0.000 description 10
- 239000007788 liquid Substances 0.000 description 10
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 9
- 238000002347 injection Methods 0.000 description 7
- 239000007924 injection Substances 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 229920002635 polyurethane Polymers 0.000 description 3
- 239000004814 polyurethane Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 229920001342 Bakelite® Polymers 0.000 description 2
- 239000004637 bakelite Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003995 emulsifying agent Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920001807 Urea-formaldehyde Polymers 0.000 description 1
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- KYKAJFCTULSVSH-UHFFFAOYSA-N chloro(fluoro)methane Chemical compound F[C]Cl KYKAJFCTULSVSH-UHFFFAOYSA-N 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 239000011120 plywood Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 150000003672 ureas Chemical class 0.000 description 1
- 238000007666 vacuum forming Methods 0.000 description 1
Landscapes
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Refrigerator Housings (AREA)
Description
この発明は断熱材としてプラスチツクの発泡体
を用いた冷蔵庫等の断熱箱体の新規な製造方法に
関するものである。
従来、ポリウレタン等の発泡性断熱材を用いた
冷蔵庫箱体の製造方法として、鉄板の折曲げによ
つて得られた外箱内に、ABS樹脂等のプラスチ
ツクシートを真空成形などによつて成形して得ら
れた内箱を装着して充填空隙を形成し、上記内箱
と外箱の接合部をシールした後、上記充填空隙に
ポリウレタン等の発泡性断熱材を適当な位置に設
けた注入口より注入して製造する方法がある。
しかしながら、この方法ではポリウレタンな
ど、注入後の発泡倍率の高い発泡性断熱材を充填
するので、それらが発泡しながら内、外箱間の空
隙を充填する時に生じる圧力、ならびに完全に充
填した後に発泡しようとするために生じる圧力に
よつて変形するのを防止するために、内、外箱の
形状に完全に一致した複雑な形状の強固な治具を
用いなければならなかつた。またこの発泡圧によ
つて、発泡性断熱材がこの内、外箱間隙より外部
へ出ようとするのを防ぐために、この空隙を完全
に密閉させたものにする必要があり、このために
種々のシールを施さねばならなかつた。それでも
不完全なシールとなることがあつて、発泡性断熱
材が洩れ、また不完全な治具の場合には変形をき
たすという欠点があつた。
この発明はこのような従来のものの欠点を除去
するためになされたもので、従来の発泡体に変
え、気体混入法によつて得られるユリアフオーム
を用いることにより、発泡性断熱材を充填させる
時に生じる発泡圧を下げ、これによつてシールお
よび発泡治具を簡略化することのできる断熱箱体
の製造方法を提供することを目的としている。
以下、図示実施例についてこの発明を詳細に説
明する。第１図はユリアフオームの発泡方法の一
例を示す系統図であり、図において、１は樹脂成
分と乳化剤、安定剤を混合した液（以下Ａ液と呼
ぶ）を貯蔵したタンク、２は硬化剤成分と乳化剤
を混合した液（以下Ｂ液と呼ぶ）を貯蔵したタン
クである。これらの液はそれぞれギヤポンプ等の
定量ポンプ３ａ，３ｂにより循環していて、その
一部を三方弁４ａ，４ｂで混合ヘツド５へ送る
が、この時液体流量計６ａ，６ｂを用いて定量ポ
ンプ３ａ，３ｂの回転数を調整し規定の量に合わ
せる。さらに混合ヘツド５へは圧縮ポンプ７で加
圧された空気を気体流量計８を用いてニードルバ
ルブ９の開放度を調整して規定の量で送る。この
ように３成分を規定量に合わせて同時に混合ヘツ
ド５に送り込み、混合ヘツド５内に設けられたミ
キサーで混合し、これを箱体の充填空隙に注入し
て硬化させる。
上記のような発泡方法では、混合液は気泡を均
一に分散したクリーム状の液体となり、これがそ
のままの状態で硬化して断熱発泡体となるため、
それ以上発泡することはほとんどない。したがつ
て、ユリアフオームを冷蔵庫等の断熱箱体に適用
するにあたり、必要とされる物性（特に強度な
ど）を得るためには、混合ヘツド５に送られるガ
スの量を変えて密度を上げることにより、必要強
度を得ることができ、また断熱性能を向上させる
ために、Ａ液とＢ液に混入する発泡用ガスの種類
を変え、例えばフロンガス等を用いることも可能
である。
上記混合ヘツド５より吐出されるユリアフオー
ムは、従来の発泡体のように自己の有する発泡能
力によつて充填していくのではなく、すでに発泡
された状態であるために冷蔵庫等の断熱箱体に注
入する場合には、その注入口は最も高い位置にあ
るようにする必要がある。第２図はその一例を示
すもので、Ａは小型タイプの冷蔵庫の箱体を、頭
部を下にして置いた状態を示す側面図、Ｂは背面
図であり、図において、１０は内箱、１１は外
箱、１２は注入口である。第２図に示すように上
になつた脚部の底部に設けた注入口１２からユリ
アフオームを注入する。注入された発泡液は内箱
１０と外箱１１によつて形成された充填空隙を頭
部から底部に向つて充填されていき、最後に脚部
に充填され、硬化する。
このユリアフオームを用いて断熱壁を形成した
冷蔵庫の断熱箱体を作るにあたり、用いる治具の
形状は、従来用いられていたウレタン等の発泡プ
ラスチツクを断熱材とする場合に比べると極めて
単純な形状のものでよい。第３図は従来のウレタ
ンフオーム１４を用いた冷蔵庫の内箱１０の棚受
け部分における発泡治具１３のあて方を示す垂直
断面図であり、１３は発泡治具である。この場
合、完全に内箱１０の棚受け部分に沿つた形状の
発泡治具１３を用いなければ、発泡圧により内箱
１０が変形をきたすことがあつた。これに対して
第４図に示すように、断熱材としてユリアフオー
ム１５を用いる冷蔵庫の内箱１０に対する発泡治
具１３のあて方は、棚受け部分の先端部分にだけ
発泡治具１３をあてるだけでも、内箱１０の変形
は全く起らない。
コーナ部分についても同様であり、第５図に示
すように従来のウレタンフオーム１４を用いる場
合は、完全に内箱１０の形状に沿つて作られた発
泡治具１３を用いなければならなかつたが、第６
図に示すようにユリアフオーム１５を用いる場合
は、内箱１０の形形状と発泡治具１３を完全に一
致させなくても、内箱１０の変形は生じない。さ
らに、外箱１１を押えるための外治具構造につい
ても同様であり、従来用いられていたウレタンフ
オームをユリアフオームに変えることによつて、
従来のＬ型アングル（鉄製）とベークライト板を
組合せたものを、ベークライト板（従来使用して
いたものに比べて1/2の厚さ）のみで十分変形を
防止できる。
以上のことはプレハブ式の冷蔵庫やシヨーケー
スなどのパネルに適用する場合でも同様であり、
発泡治具が不要となるか、もしくは簡単なベニヤ
板を用いてユリアフオームを充填することが可能
となる。
このように、ユリアフオームを冷蔵庫等の断熱
箱体に適用するためには、従来用いれらていた発
泡性断熱材との違いを製品仕様に反映させること
が必要で、表１にその一例として、小型タイプの
冷蔵庫の発泡性断熱材として、従来用いられてい
たウレタンフオームをユリアフオームに変えた場
合の製品および製造の主な仕様、コスト比率の差
を示す。
This invention relates to a new method for manufacturing a heat insulating box for a refrigerator or the like using plastic foam as a heat insulating material. Conventionally, the method for manufacturing refrigerator boxes using foamed insulation materials such as polyurethane has been to mold plastic sheets such as ABS resin into outer boxes obtained by bending iron plates by vacuum forming. After installing the inner box obtained by the process to form a filling gap and sealing the joint between the inner box and the outer box, an injection port is installed in which a foam insulation material such as polyurethane is provided at an appropriate position in the filling gap. There is a method of manufacturing by injection. However, in this method, the foam insulation material such as polyurethane is filled with a high expansion ratio after injection, so the pressure generated when the material foams and fills the gap between the inner and outer boxes, as well as the foaming after being completely filled. In order to prevent deformation due to the pressure caused by trying to remove the product, it was necessary to use a strong jig with a complex shape that perfectly matched the shapes of the inner and outer boxes. In addition, in order to prevent the foam insulation material from coming out from the gap between the inner and outer boxes due to the foaming pressure, it is necessary to completely seal this gap. It was necessary to apply a seal. Even so, there were drawbacks such as incomplete sealing, leakage of the foam insulation, and deformation in the case of incomplete jigs. This invention was made in order to eliminate these drawbacks of the conventional foam, and by using urea foam obtained by the gas mixing method instead of the conventional foam, it is possible to fill the foam with a foam insulation material. It is an object of the present invention to provide a method for manufacturing a heat insulating box which can reduce the foaming pressure generated and thereby simplify sealing and foaming jigs. The invention will now be described in detail with reference to the illustrated embodiments. Figure 1 is a system diagram showing an example of the foaming method for urea foam. In the figure, 1 is a tank storing a liquid mixture of resin components, emulsifiers, and stabilizers (hereinafter referred to as liquid A), and 2 is a hardening agent. This tank stores a liquid mixture of ingredients and an emulsifier (hereinafter referred to as liquid B). These liquids are circulated by metering pumps 3a, 3b such as gear pumps, and a part of them is sent to the mixing head 5 by three-way valves 4a, 4b. , 3b to match the specified amount. Further, air pressurized by a compression pump 7 is sent to the mixing head 5 in a specified amount by adjusting the opening degree of a needle valve 9 using a gas flow meter 8. In this way, the three components are simultaneously fed into the mixing head 5 in predetermined amounts, mixed by a mixer provided in the mixing head 5, and then poured into the filling gap of the box and hardened. In the foaming method described above, the mixed liquid becomes a cream-like liquid with air bubbles evenly dispersed, and this hardens as it is to become an insulating foam.
There is almost no further foaming. Therefore, in order to obtain the required physical properties (especially strength, etc.) when applying urea foam to an insulating box such as a refrigerator, it is necessary to increase the density by changing the amount of gas sent to the mixing head 5. In order to obtain the necessary strength and to improve the heat insulation performance, it is also possible to change the type of foaming gas mixed into the A liquid and the B liquid, for example, using chlorofluorocarbon gas or the like. The urea foam discharged from the mixing head 5 is not filled by its own foaming ability like conventional foams, but is already in a foamed state, so it can be used in insulation boxes such as refrigerators. When injecting into the tank, the injection port should be at the highest position. Figure 2 shows an example of this.A is a side view of the box of a small type refrigerator, with the head facing down, and B is a rear view.In the figure, 10 is the inner box. , 11 is an outer box, and 12 is an injection port. As shown in FIG. 2, urea foam is injected through the injection port 12 provided at the bottom of the upper leg. The injected foaming liquid fills the filling gap formed by the inner box 10 and the outer box 11 from the head toward the bottom, and finally fills the legs and hardens. When making an insulating box for a refrigerator with an insulating wall formed using this urea foam, the shape of the jig used is extremely simple compared to the conventionally used foamed plastic such as urethane as the insulating material. It's fine to use one. FIG. 3 is a vertical sectional view showing how to apply a foaming jig 13 to a shelf support portion of an inner box 10 of a refrigerator using a conventional urethane foam 14, and 13 is a foaming jig. In this case, unless a foaming jig 13 having a shape that completely follows the shelf support portion of the inner box 10 is used, the inner box 10 may be deformed by the foaming pressure. On the other hand, as shown in FIG. 4, the method of applying the foaming jig 13 to the inner box 10 of a refrigerator using urea foam 15 as a heat insulating material is to apply the foaming jig 13 only to the tip of the shelf support part. However, no deformation of the inner box 10 occurs. The same applies to the corner portions, and when using the conventional urethane foam 14 as shown in FIG. , 6th
As shown in the figure, when using the urea foam 15, the inner box 10 will not be deformed even if the shape of the inner box 10 and the foaming jig 13 are not completely matched. Furthermore, the same applies to the outer jig structure for holding down the outer box 11, and by changing the conventionally used urethane foam to urea foam,
A combination of a conventional L-shaped angle (made of iron) and a Bakelite plate, but the Bakelite plate (half the thickness of the conventionally used one) is enough to prevent deformation. The above is the same when applied to panels such as prefabricated refrigerators and show cases.
A foaming jig becomes unnecessary, or a simple plywood board can be used to fill the urea foam. In this way, in order to apply Uriafoam to insulation boxes such as refrigerators, it is necessary to reflect the differences from conventionally used foam insulation materials in the product specifications. Table 1 shows an example of this. This section shows the main product and manufacturing specifications and differences in cost ratios when the conventionally used urethane foam is replaced with urea foam as a foam insulation material for small-sized refrigerators.
【表】
表１から明らかなように、断熱材を変えること
により熱伝導率が低下するが、壁厚を増すこと
で、冷蔵庫の断熱箱体としての性能を維持でき
る。その結果、用いる断熱材の体積を増加しなけ
ればならないが、ユリアフオームは密度が低いこ
と、単価が安いことなどによつて、冷蔵庫１台あ
たりに用いる断熱材の材料費はウレタンフオーム
に比べて10％程度下げることができる。
なお上記実施例では、混合ヘツド５により混合
発泡させる場合について述べたが、他の手段によ
り気泡を混入し発泡させてもよい。またユリアフ
オームを注入する場合、自然流下式でなくポンプ
等により注入することもできる。
また上記実施例は冷蔵庫の断熱箱体について説
明したが、この発明は冷蔵庫以外の断熱箱体につ
いても同様に実施でき、同等の効果を奏する。
この発明は以上述べたように、冷蔵庫等の断熱
箱体に、断熱材として従来の発泡体に変えてユリ
アフオームを用いることによつて、断熱材を内、
外箱空隙に充填させる時に生じる発泡圧を極端に
小さくすることができ、これによつて充填時に必
要とされている発泡治具の簡略化、または廃止が
可能となり、さらに断熱材の洩止めシールも極端
に大きい隙間を除いて廃止することができ、また
製造コストも低減できるなどの効果がある。[Table] As is clear from Table 1, changing the heat insulating material lowers the thermal conductivity, but by increasing the wall thickness, the performance as a heat insulating box for the refrigerator can be maintained. As a result, the volume of the insulation material used must be increased, but due to the low density and low unit price of urea foam, the material cost of the insulation material used per refrigerator is lower than that of urethane foam. It can be reduced by about 10%. In the above-mentioned embodiment, the case where mixing and foaming is carried out by the mixing head 5 has been described, but bubbles may be mixed and foamed by other means. Furthermore, when injecting ureaform, it is also possible to inject it using a pump or the like instead of the gravity flow method. Furthermore, although the above embodiments have been described with respect to a heat insulating box for a refrigerator, the present invention can be implemented in a similar manner to a heat insulating box other than a refrigerator, and the same effect can be obtained. As described above, this invention uses urea foam instead of conventional foam as a heat insulating material in a heat insulating box for a refrigerator, etc., thereby adding heat insulating material inside.
The foaming pressure generated when filling the outer box cavity can be extremely reduced, which makes it possible to simplify or eliminate the foaming jig required during filling, and also to provide a leak-proof seal for the insulation material. This also has the effect of being able to eliminate all but extremely large gaps and reducing manufacturing costs.
第１図はこの発明の一実施例におけるユリアフ
オームの発泡方法を示す系統図、第２図Ａは冷蔵
庫の箱体を頭部を下にして置いた状態を示す側面
図、Ｂは背面図、第３図及び第４図はウレタンフ
オームを用いた場合とユリアフオームを用いた場
合の、それぞれ内箱の棚受け部分における治具の
挿入状態を示す垂直断面図、第５図及び第６図は
ウレタンフオームを用いた場合とユリアフオーム
を用いた場合の、それぞれ内箱のコーナ部分にお
ける治具の挿入状態を示す垂直断面図である。
各図中、同一符号は同一または相当部分を示す
ものとし、１，２はタンク、３ａ，３ｂは定量ポ
ンプ、５は混合ヘツド、７は圧縮ポンプ、１０は
内箱、１１は外箱、１２は注入口、１４はウレタ
ンフオーム、１５はユリアフオームである。
Fig. 1 is a system diagram showing a method of foaming urea foam in an embodiment of the present invention, Fig. 2A is a side view showing a refrigerator box with its head facing down, and Fig. 2B is a rear view. Figures 3 and 4 are vertical sectional views showing how the jig is inserted into the shelf support part of the inner box when using urethane foam and when using urea foam, respectively, and Figures 5 and 6 are FIG. 7 is a vertical cross-sectional view showing the insertion state of the jig at the corner portion of the inner box when urethane foam is used and when urea foam is used, respectively. In each figure, the same reference numerals indicate the same or equivalent parts, 1 and 2 are tanks, 3a and 3b are metering pumps, 5 is a mixing head, 7 is a compression pump, 10 is an inner box, 11 is an outer box, 12 14 is an injection port, 14 is a urethane foam, and 15 is a urea foam.
Claims (1)
断熱材としてプラスチツク発泡体を注入して硬化
させ、断熱箱体を製造する方法において、プラス
チツク発泡体として気体混入法によつて得られる
ユリアフオームを注入することを特徴とする断熱
箱体の製造方法。 ２ 樹脂成分、硬化剤成分および発泡用ガスを混
合ヘツドで混合してユリアフオームを形成し、注
入することを特徴とする特許請求の範囲第１項記
載の断熱箱体の製造方法。 ３ ユリアフオームを注入する際に発泡治具を使
用することを特徴とする特許請求の範囲第１項ま
たは第２項記載の断熱箱体の製造方法。[Claims] 1. In the filling gap formed between the inner box and the outer box,
A method for producing an insulating box by injecting and curing plastic foam as a heat insulating material, the method comprising injecting urea foam obtained by a gas mixing method as the plastic foam. . 2. A method for manufacturing a heat insulating box according to claim 1, characterized in that a resin component, a curing agent component, and a foaming gas are mixed in a mixing head to form a urea foam and then injected. 3. The method of manufacturing a heat insulating box according to claim 1 or 2, characterized in that a foaming jig is used when injecting the urea foam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11316480A JPS5738126A (en) | 1980-08-18 | 1980-08-18 | Manufacture of heat insulated cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11316480A JPS5738126A (en) | 1980-08-18 | 1980-08-18 | Manufacture of heat insulated cabinet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5738126A JPS5738126A (en) | 1982-03-02 |
| JPH0228448B2 true JPH0228448B2 (en) | 1990-06-25 |
Family
ID=14605165
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11316480A Granted JPS5738126A (en) | 1980-08-18 | 1980-08-18 | Manufacture of heat insulated cabinet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5738126A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001020675A (en) * | 1999-07-09 | 2001-01-23 | Kajima Corp | Void filling method in excavating ground by excavator |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2512421B2 (en) * | 1985-09-09 | 1996-07-03 | 井関農機株式会社 | Weighing and packing device for fruits |
| JP2709425B2 (en) * | 1992-02-07 | 1998-02-04 | 東海化成工業株式会社 | Urethane foam resin mixing equipment |
-
1980
- 1980-08-18 JP JP11316480A patent/JPS5738126A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001020675A (en) * | 1999-07-09 | 2001-01-23 | Kajima Corp | Void filling method in excavating ground by excavator |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5738126A (en) | 1982-03-02 |
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