CN101979233A - Process for producing negative pressure foamed refrigerator - Google Patents
Process for producing negative pressure foamed refrigerator Download PDFInfo
- Publication number
- CN101979233A CN101979233A CN 201010509184 CN201010509184A CN101979233A CN 101979233 A CN101979233 A CN 101979233A CN 201010509184 CN201010509184 CN 201010509184 CN 201010509184 A CN201010509184 A CN 201010509184A CN 101979233 A CN101979233 A CN 101979233A
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- refrigerator
- negative pressure
- foaming
- box cavity
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Abstract
The invention discloses a process for producing a negative pressure foamed refrigerator, which comprises the following steps of: putting a refrigerator box into a sealing system, vacuumizing a box cavity to ensure a negative pressure state, feeding the box cavity, foaming feed liquid, filling and curing to form a foamed box. Compared with the conventional foamed refrigerator, the refrigerator manufactured by the process has the advantages of uniform foam density distribution, low feeding amount, low power consumption, high demoulding efficiency and the like.
Description
Technical field:
The present invention relates to a kind of negative pressure foaming refrigerator production technology, belong to the refrigerator foaming technical field.
Background technology:
Refrigerator, refrigerator-freezer foaming generally are meant hard polyurethane foam, foam is between outcase of refrigerator and liner, by isocyanates (be commonly called as black material), combined polyether (being commonly called as white material) after the mixing head of foaming machine high pressure mixing, inject Die Box or door body cavity internal reaction, and emit heat, the blowing agent in the raw material is met hot gasization, form microbubble, microbubble is grown, is expanded, and is full of the cavity of casing or door body, solidify to form the hard polyaminoester closed-cell foam.The performance of foam and production technology have determined the quality of refrigerator, refrigerator-freezer performance.
Foaming properties is relevant with reaction speed with production technology, and available gel time characterizes the size of reaction speed.Generally, reaction speed is fast more, and abscess is fine and smooth more, and thermal conductivity factor is low more.Reaction speed is fast more, and foam expansion is fast more, emits gas velocity and accelerates, and foam is in relative sealed cavity internal gas pressure and increases, and flow resistance increases, and foam is difficult for flowing, so the foam production arts demand changes.
At present, refrigerator foaming production efficiency is progressively improving, casing and door body assembly technology are more and more meticulousr, and its internal cavities almost seals, and foam flows in the cavity of this " sealing ", the acceleration of foam reactant, expansion, emit gas and accelerate, foam flow process cavity internal gas pressure increases, and flow resistance increases, it is many to fill the required raw material of full whole cavity, and refrigerator foam density height, skewness, the production efficiency that makes is low, heat-insulating property is not good.For improving the refrigerator performance, reduce the raw material consumption, need to change the refrigerator foaming production technology.
Summary of the invention:
For overcoming the defective of prior art, the object of the present invention is to provide a kind of negative pressure foaming refrigerator production technology, foam reactant speed is fast, improve refrigerator foaming production efficiency greatly, improve the refrigerator heat-insulating property, reduce foam surface bubble probability, improve the refrigerator foaming quality greatly.
Technical solution problem of the present invention adopts following technical scheme:
Negative pressure foaming refrigerator production technology, carry out according to the following steps:
A, refrigerator body is placed sealing system;
B, preceding box cavity is vacuumized of material feeding make it to be negative pressure state;
C, carry out material feeding to box cavity, feed liquid foams, fills, solidify to form the foaming casing.
The described step that vacuumizes, be the vacuum ranges of box cavity 0～-0.08Mpa;
Described material feeding step is to inject in box cavity by isocyanates and combined polyether 1.1～1.3: 1 feed liquid of forming by weight, contains blowing agent in the described combined polyether, and the percentage by weight of blowing agent in combined polyether is 9～23%;
Described blowing agent is the one or more combination among pentamethylene, isopentane, 245fa, 365mfc, the 134a.
Compared with the prior art, beneficial effect of the present invention is embodied in:
1, at first casing is vacuumized, inject the feed liquid foaming to box cavity again, the frothy gel time can be reduced to 16-30 second, and foam reactant speed is fast, and casing reduces more than the 2min than the normal pressure foaming hardening time, and the foam production improved efficiency is more than 25%.
2, foamy body height can reduce casing raw material use amount.
3, foam is fine and smooth more, and abscess is round, and the foam thermal conductivity factor is low, reduces 5-10%, and refrigerator complete machine power consumption reduces 5-8%.
4, the foam stream dynamic resistance is little, and the foam surface quality is good, and the porosity reduces greatly.
Description of drawings:
Fig. 1 is technological process of production figure of the present invention.
Fig. 2 is refrigerator negative pressure of the present invention foaming and anchor clamps and mould schematic diagram.
Fig. 3 is an anchor clamps schematic top plan view of the present invention.
Fig. 4 is the sofa seat structural representation that the present invention adopts.
Number in the figure: 1 empty van body, 2 front aprons, 3 front apron liner plates, 4 base plates, 5 base plates lining mould, 6 sofa seats, 7 backboards, 8 backboard liner plates, 9 top boards, 10 top board liner plates, 11 core rods, 12 aspirating holes, 13 gas ports, the sealing of 14 top perimeter, 15 bottom peripheral seal, the sealing of 16 sofa seats periphery, 17 side plates, 18 side plate liner plates, 19 bars, the sealing of 20 side direction periphery, 21 annular seal spaces, the 22 water pipes cavity of stepping down, 23 sofa seat material holes.
Below pass through the specific embodiment, and the invention will be further described in conjunction with the accompanying drawings.
The specific embodiment:
Embodiment: negative pressure foaming refrigerator production technology of the present invention, carry out according to the following steps:
A, refrigerator body is placed sealing system;
B, preceding box cavity is vacuumized of material feeding make it to be negative pressure state;
C, carry out material feeding to box cavity, feed liquid foams, fills, solidify to form the foaming casing.
The described step that vacuumizes, be the vacuum ranges of box cavity 0～-0.08Mpa;
Described material feeding step is to inject in box cavity by isocyanates and combined polyether 1.1～1.3: 1 feed liquid of forming by weight, contains blowing agent in the described combined polyether, and the percentage by weight of blowing agent in combined polyether is 9～23%;
Described blowing agent is the one or more combination among pentamethylene, isopentane, 245fa, 365mfc, the 134a.
In concrete the enforcement, the processing step that is adopted is:
1, empty van body warm: the empty van body 1 that assembles enters the preheating drying tunnel by the cylinder line, drying tunnel temperature 45-60 ℃, preheating time 1～2min.
2, empty van body course of conveying: when anchor clamps were wanted case, travelling bogie ran to preheating drying tunnel place automatically, and behind the dolly location, the empty van body is transferred on the travelling bogie by drying tunnel cylinder line, before dolly is transported to the anchor clamps cylinder line of wanting case to casing.Simultaneously, anchor clamps base plate lining mould 5 is sent by belt pulley, is placed on the anchor clamps inlet cylinder line.
3, inlet process: behind the dolly location, the manipulator on the dolly serves as a contrast the base plate that empty van body 1 picks up, is placed on the anchor clamps cylinder line on the mould 5, by belt pulley base plate lining mould 5 and empty van body 1 is sent in the anchor clamps.
4, matched moulds, want the rifle process: behind base plate lining mould 5 and empty van body 1 location, touch anchor clamps near switch after, anchor clamps begin to rise, matched moulds, the mixing head of foaming machine dolly begins to this anchor clamps operation simultaneously.Behind the locked mode, casing gas port 13 and anchor clamps aspirating hole 12 automatic butt, mixing head moves forward, seals sofa seat material hole 23 (as shown in Figure 4), and this moment, box sealing was in die cavity.
5, vacuum: start pumped vacuum systems, under the draught head effect, the inside and outside gas of box cavity enters vacuum tank by box body splicing slit, gas port 13, aspirating hole 12, and frothy gel stopped before the time vacuumizing.
6, material feeding process: when vacuumizing beginning after 8～12 seconds, aspirating hole place vacuum reaches-0.06～-0.08MPa, mixing head of foaming machine will expect to start, raw material after the mixing head inner high voltage mixes, penetrates, drops on casing back zone line after cycle of higher pressure after a while, material feeding finishes after reaching set amount, mixing head was still sealed the sofa seat material hole after 23,30～35 seconds, and mixing head is return.
7, foaming process: feed liquid is carried out fast reaction, foaming in box cavity, under the effect that vacuumizes, gas is constantly extracted out in the box cavity, and air pressure is lower, is negative pressure state, the foam stream dynamic resistance is little, filling speed is fast, and preceding 0～5 second of frothy gel time (18～28 seconds), foam was full of the whole box body cavity, stop to vacuumize this moment, and the vacuum up of aspirating hole place is to-0.02～0MPa.
8, curing, knockout course: casing solidifies to reach sets hardening time, the beginning demoulding, and the anchor clamps holder the foaming casing and is moved downwards.
9, outlet, course of conveying: after anchor clamps move downwards and stop, belt pulley is sent anchor clamps to base plate lining mould 5 together with casing, transfer on the anchor clamps turnover case cylinder line, before travelling bogie is transported to this anchor clamps cylinder line to the empty van body simultaneously, the dolly manipulator picks up the foaming casing and is placed on the travelling bogie then, simultaneously, another manipulator of dolly picks up the empty van body and is placed on the base plate lining mould; Afterwards, dolly is transported to the foaming casing on the cylinder line, enters next process, thereby finishes the foam box operation.
The used empty van body of the present invention has following characteristics on structure and assembly technology:
1, negative pressure foaming refrigerator body at the top or the bottom be provided with gas port 13 (as shown in Figure 2), be connected with anchor clamps, mould aspirating hole 12 respectively.
2, according to the difference of casing type, size, can paste the air guide band around box cavity liner mouth, the air guide band is connected with gas port, and in the foam-filled process, the gas in the cavity is discharged, or directly discharged by gas port by air guide band, gas port; Foam enters aspirating hole when preventing to bleed, at the casing gas port 13 inboard breathable adhesive tapes that paste.
3, casing liner, floor ventilating hole number reduce, and even need not beat steam vent.
Anchor clamps that preparation process of the present invention is used and mould need to carry out Seal Design to its each position, and are provided with sealing strip in splicing place, have following design feature (as Fig. 2～shown in Figure 4):
1, side plate 17 inboards are provided with side plate liner plate 18, and core rod 11 is in the middle of casing.
2, front apron 2 and backboard 7 inboards, be respectively equipped with front apron liner plate 3, backboard liner plate 8, bar 19 outsides are provided with sealing strip, are connected with side plate liner plate 18, realize that chuck side is to periphery sealing 20.
3, top board 9 outsides are provided with top board liner plate 10, and its periphery is provided with sealing strip, are connected with forward and backward baffle plate liner plate 3,8, side plate liner plate 18, realize anchor clamps top perimeter sealing 14.
4, be provided with movable base plate lining mould 5 peripheries above the base plate 4 and be provided with sealing strip, be connected, realize clamp base periphery sealing 15 with front apron liner plate 3, side plate liner plate 18, sofa seat 6.
5, sofa seat 6 left and right sides are provided with annular seal space 21, sealing refrigerator support, and the sofa seat periphery is provided with sealing strip, is connected with side plate liner plate 18, backboard liner plate 8, base plate lining mould 5, realizes sofa seat periphery sealing 16.
6, sofa seat 6 both sides are provided with annular seal space 21, and sealing refrigerator support, sofa seat 6 and water pipe connecting portion are provided with the water pipe cavity 22 of stepping down, and sofa seat material hole 23 dock with the refrigerator material hole, and after mixing head of foaming machine was blocked material hole, realization material hole position sealed.
7, front apron, backboard, the top board aspirating hole 12 that to establish a diameter respectively be 10mm is realized the inside and outside exhaust of casing.
The anchor clamps of said structure and the sealing of mould and good operating stability by changing different size bar, base plate lining mould, sofa seat, can be produced width, casing that length is different, produce flexibly, are fit to many kinds refrigerator vacuum foam production.In addition, anchor clamps are provided with circulation, are controlled at 35-50 ℃ to guarantee mold temperature.
It is the hard polyurethane foam raw material that the present invention prepares used raw material.Isocyanates (being commonly called as black material) adopts the raw material trade mark that is fit to refrigerator foaming to have: M20S, 44V20L, 5005, PM-2010, PAPI27, M200, MR-200, PM-200 etc.Combined polyether (being commonly called as white material) is fit to high viscosity, fast reaction system, and the combined polyether viscosity that does not contain blowing agent is generally at 4500-7000mps, frothy gel time 16-30 second.According to the different requirements of refrigerator cost, production efficiency, heat-insulating property, adopt pentamethylene system, pentamethylene/245fa system, pentamethylene/isopentane/245fa system etc.In foam production, blowing agent contained percentage by weight in white material is 9～23%, and black and white material proportioning is (1.1～1.3): 1.
According to negative pressure foaming technology of the present invention and production technology, except can be used for refrigerator negative pressure foam production, also can be used for negative pressure foam production such as refrigerator-freezer, wine cabinet, have extensive use in the polyurethane foam field.
Claims (1)
1. negative pressure foaming refrigerator production technology is characterized in that carrying out according to the following steps:
A, refrigerator body is placed sealing system;
B, preceding box cavity is vacuumized of material feeding make it to be negative pressure state;
C, carry out material feeding to box cavity, feed liquid foams, fills, solidify to form the foaming casing.
The described step that vacuumizes, be the vacuum ranges of box cavity 0～-0.08Mpa;
Described material feeding step is to inject in box cavity by isocyanates and combined polyether 1.1～1.3: 1 feed liquid of forming by weight, contains blowing agent in the described combined polyether, and the percentage by weight of blowing agent in combined polyether is 9～23%;
Described blowing agent is the one or more combination among pentamethylene, isopentane, 245fa, 365mfc, the 134a.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010509184 CN101979233A (en) | 2010-10-18 | 2010-10-18 | Process for producing negative pressure foamed refrigerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010509184 CN101979233A (en) | 2010-10-18 | 2010-10-18 | Process for producing negative pressure foamed refrigerator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101979233A true CN101979233A (en) | 2011-02-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201010509184 Pending CN101979233A (en) | 2010-10-18 | 2010-10-18 | Process for producing negative pressure foamed refrigerator |
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Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102241101A (en) * | 2011-05-18 | 2011-11-16 | 合肥美的荣事达电冰箱有限公司 | Refrigerator negative-pressure foaming device and process |
| CN102658620A (en) * | 2012-05-07 | 2012-09-12 | 青岛海信模具有限公司 | Method for improving surface quality of foam molded plastic part |
| CN103012711A (en) * | 2011-09-21 | 2013-04-03 | 绍兴市恒丰聚氨酯实业有限公司 | Hard polyurethane molding foam negative pressure foaming raw material formula and hard polyurethane molding foam negative pressure foaming production method |
| WO2014019962A1 (en) | 2012-07-31 | 2014-02-06 | Bayer Materialscience Ag | Method for the production of polyurethane foam using emulsified blowing agent |
| CN104290235A (en) * | 2013-07-15 | 2015-01-21 | 浙江日普电子科技有限公司 | Preparation method of body or door of refrigerator |
| CN104619759A (en) * | 2012-07-31 | 2015-05-13 | 拜尔材料科学股份公司 | Vacuum-assisted process for preparing polyurethane foams |
| CN104908192A (en) * | 2015-05-31 | 2015-09-16 | 扬州市君睿创智工业设计有限公司 | Water tank foaming process method |
| CN105273217A (en) * | 2014-07-14 | 2016-01-27 | 杭州金松优诺电器有限公司 | HFC-245fa ternary foaming agent-based thermal insulation material and filling technology |
| CN105563725A (en) * | 2016-02-01 | 2016-05-11 | 安徽省万爱电器科技有限公司 | Refrigerator body foaming process of small single-door refrigerator |
| CN105985503A (en) * | 2016-06-20 | 2016-10-05 | 海信容声(广东)冰箱有限公司 | Polyurethane reaction composition for negative pressure foaming and method for preparing polyurethane foam by using composition |
| CN107522835A (en) * | 2017-08-17 | 2017-12-29 | 合肥美菱股份有限公司 | A kind of high viscosity fast response polyurethane foam system and its application |
| CN109466008A (en) * | 2018-12-19 | 2019-03-15 | 温州市环球汽车衬垫有限公司 | A kind of constant pressure foaming method and mold |
| CN109483790A (en) * | 2018-12-19 | 2019-03-19 | 温州市环球汽车衬垫有限公司 | PUR foaming method based on thermoplastic elastomer films |
| CN109708374A (en) * | 2019-01-28 | 2019-05-03 | 长虹美菱股份有限公司 | A kind of thin-walled refrigerator |
| CN110305282A (en) * | 2019-07-04 | 2019-10-08 | 长虹美菱股份有限公司 | A kind of heat-insulated layer formula and foam process of negative pressure foamed refrigerator |
| CN110450336A (en) * | 2019-09-16 | 2019-11-15 | 长虹美菱股份有限公司 | A kind of refrigerator foaming equipment and foaming method |
| CN111421734A (en) * | 2020-03-06 | 2020-07-17 | 青岛海尔电冰箱有限公司 | Refrigerator body foaming method |
| CN111421735A (en) * | 2020-03-06 | 2020-07-17 | 青岛海尔电冰箱有限公司 | Refrigerator body foaming method |
| CN112440424A (en) * | 2019-08-27 | 2021-03-05 | 海尔智家股份有限公司 | Foaming process of refrigerator |
| CN112497620A (en) * | 2020-11-17 | 2021-03-16 | 安徽智汇和科技服务有限公司 | Box foaming system |
| CN112497618A (en) * | 2020-11-17 | 2021-03-16 | 安徽智汇和科技服务有限公司 | Mechanical arm |
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| DE10243873A1 (en) * | 2002-09-21 | 2004-04-01 | Electrolux Home Products Corporation N.V. | Foaming out a hollow element, comprises feeding in foam through a primary opening while simultaneously sucking out air via a further opening |
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Cited By (29)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102241101A (en) * | 2011-05-18 | 2011-11-16 | 合肥美的荣事达电冰箱有限公司 | Refrigerator negative-pressure foaming device and process |
| CN103012711A (en) * | 2011-09-21 | 2013-04-03 | 绍兴市恒丰聚氨酯实业有限公司 | Hard polyurethane molding foam negative pressure foaming raw material formula and hard polyurethane molding foam negative pressure foaming production method |
| CN102658620A (en) * | 2012-05-07 | 2012-09-12 | 青岛海信模具有限公司 | Method for improving surface quality of foam molded plastic part |
| CN102658620B (en) * | 2012-05-07 | 2014-03-26 | 青岛海信模具有限公司 | Method for improving surface quality of foam molded plastic part |
| RU2640040C2 (en) * | 2012-07-31 | 2017-12-26 | Байер Матириальсайенс Аг | Vacuum method of producing polyurethane foam |
| WO2014019962A1 (en) | 2012-07-31 | 2014-02-06 | Bayer Materialscience Ag | Method for the production of polyurethane foam using emulsified blowing agent |
| CN104619759A (en) * | 2012-07-31 | 2015-05-13 | 拜尔材料科学股份公司 | Vacuum-assisted process for preparing polyurethane foams |
| US9926421B2 (en) | 2012-07-31 | 2018-03-27 | Covestro Deutschland Ag | Vacuum-supported method for the production of polyurethane foam |
| CN104290235A (en) * | 2013-07-15 | 2015-01-21 | 浙江日普电子科技有限公司 | Preparation method of body or door of refrigerator |
| CN104290235B (en) * | 2013-07-15 | 2016-08-10 | 浙江日普电子科技有限公司 | The casing of a kind of refrigerator or chamber door preparation method |
| CN105273217A (en) * | 2014-07-14 | 2016-01-27 | 杭州金松优诺电器有限公司 | HFC-245fa ternary foaming agent-based thermal insulation material and filling technology |
| CN104908192A (en) * | 2015-05-31 | 2015-09-16 | 扬州市君睿创智工业设计有限公司 | Water tank foaming process method |
| CN105563725A (en) * | 2016-02-01 | 2016-05-11 | 安徽省万爱电器科技有限公司 | Refrigerator body foaming process of small single-door refrigerator |
| CN105985503B (en) * | 2016-06-20 | 2019-04-02 | 海信容声(广东)冰箱有限公司 | A kind of negative-pressure foaming polyurethane reaction composition and the method using the composition preparation polyurethane foam |
| CN105985503A (en) * | 2016-06-20 | 2016-10-05 | 海信容声(广东)冰箱有限公司 | Polyurethane reaction composition for negative pressure foaming and method for preparing polyurethane foam by using composition |
| CN107522835A (en) * | 2017-08-17 | 2017-12-29 | 合肥美菱股份有限公司 | A kind of high viscosity fast response polyurethane foam system and its application |
| CN109466008A (en) * | 2018-12-19 | 2019-03-15 | 温州市环球汽车衬垫有限公司 | A kind of constant pressure foaming method and mold |
| CN109483790A (en) * | 2018-12-19 | 2019-03-19 | 温州市环球汽车衬垫有限公司 | PUR foaming method based on thermoplastic elastomer films |
| CN109708374A (en) * | 2019-01-28 | 2019-05-03 | 长虹美菱股份有限公司 | A kind of thin-walled refrigerator |
| CN110305282A (en) * | 2019-07-04 | 2019-10-08 | 长虹美菱股份有限公司 | A kind of heat-insulated layer formula and foam process of negative pressure foamed refrigerator |
| CN112440424A (en) * | 2019-08-27 | 2021-03-05 | 海尔智家股份有限公司 | Foaming process of refrigerator |
| CN110450336A (en) * | 2019-09-16 | 2019-11-15 | 长虹美菱股份有限公司 | A kind of refrigerator foaming equipment and foaming method |
| CN110450336B (en) * | 2019-09-16 | 2023-09-15 | 长虹美菱股份有限公司 | Refrigerator foaming equipment and foaming method |
| CN111421735A (en) * | 2020-03-06 | 2020-07-17 | 青岛海尔电冰箱有限公司 | Refrigerator body foaming method |
| CN111421734A (en) * | 2020-03-06 | 2020-07-17 | 青岛海尔电冰箱有限公司 | Refrigerator body foaming method |
| CN112497620A (en) * | 2020-11-17 | 2021-03-16 | 安徽智汇和科技服务有限公司 | Box foaming system |
| CN112497618A (en) * | 2020-11-17 | 2021-03-16 | 安徽智汇和科技服务有限公司 | Mechanical arm |
| CN112497620B (en) * | 2020-11-17 | 2021-12-14 | 安徽中巨智能科技有限公司 | Box foaming system |
| CN112497618B (en) * | 2020-11-17 | 2021-12-17 | 安徽中巨智能科技有限公司 | Mechanical arm |
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Application publication date: 20110223 |