CN103341944B - Foaming method - Google Patents
Foaming method Download PDFInfo
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- CN103341944B CN103341944B CN201310288048.2A CN201310288048A CN103341944B CN 103341944 B CN103341944 B CN 103341944B CN 201310288048 A CN201310288048 A CN 201310288048A CN 103341944 B CN103341944 B CN 103341944B
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- foamed material
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Abstract
The invention discloses a foaming method. The foaming method is characterized by comprising the following steps of: manufacturing a foaming module, filling foaming materials into an inner cavity of a module for multiple times, wherein the drop points of the filled foaming materials of each time are different, and foaming and expanding the foaming materials until the inner cavity of the module is fully filled. The foaming method provided by the invention has the advantages that a multi-point injection method is utilized for foaming, the flowing time of foam in a cavity of a box body is shortened, and the production efficiency is improved, the materials flow to each filling part before beginning to carry out a foaming reaction, the foaming materials are fully reacted, the diameters of foaming holes are fine and uniform, and a heat preservation effect is good.
Description
Technical field
The present invention relates to foaming method, specifically, is a kind of foaming method for making insulation material.
Background technology
Along with the raising of people's living standard, the demand of people to domestic refrigerating appts such as refrigerators is increasing, also more and more higher to the requirement of its performance.In order to keep the temperature of refrigeration plant, the transmission reducing heat, to save electric energy, needs to do heat-insulation layer to refrigeration plants such as refrigerators.In prior art, foam process normally fix a point frequency injection.As shown in Figure 1, foaming mould 101 presets sprue, foaming mould 101 has been pre-installed rear High Pressure Gun head 102 and has been expelled in foaming mould 101 by foamed material 103 and completes foaming.Because frequent injections of fixing a point is by foamed material by respective point in pressure injection to foaming mould, foamed material is more from this point to the flowing of other cavity places, and foaming forms heat-insulation layer.
Problem existing for above prior art is, 1) expansion rate is slow, affects production efficiency; 2) the heat-insulation layer Density inhomogeneity formed: the position heat-insulation layer density near foamed material drop point is large, and the position heat-insulation layer density away from foamed material drop point is little; 3) easily produce the incomplete phenomenon of foaming: at the edge of housing, especially easily generate the cavity without heat-insulation layer away from the edge of foamed material drop point, greatly have impact on heat insulation effect.
In order to solve the problem, currently used scheme has 1) vacuum foam: namely in foaming mould, realize negative pressure, reduce Flow of Goods and Materials resistance, improve flowing velocity; 2) vacuum aided attracts: namely on foaming mould, increase vacuum generator, and marginal not material limit is vented, and reduces internal gas resistance, increases mobility.But these two kinds of modes all need vacuum plant, and production cost is high.
Summary of the invention
The technical problem to be solved in the present invention solves the poor problem of foaming layer heat-insulating property that refrigerating plant heat-insulation layer in prior art causes slowly due to foam flowing velocity, provides that a kind of production efficiency is high, uniform in foaming and not easily produce the incomplete foaming method of foaming.
In order to solve the problems of the technologies described above, the invention provides a kind of foaming method, comprising:
Make foaming mould;
In dies cavity, inject foamed material several times, each foamed material drop point injected is different;
Foamed material foaming and intumescing, until fill full dies cavity.
Further, the described method injecting foamed material several times in dies cavity is:
Adopt frequency conversion rifle head, from described foaming mould a bit to foam-injection material dies cavity, injected a bit, changed injection pressure, again to foam-injection material in dies cavity, until injected.
Further, the technological parameter adopted when injecting foamed material in dies cavity is: the material temperature of foamed material: 18-20 DEG C; The mould temperature of foaming mould: 45 ± 5 DEG C; Form the isocyanate material of described foamed material: PPG+blowing agent is: 1:1.20-1:1.24; Foamed material injection flow: 1400-2000g/s; The foamed solidification time: 180-300s.
Further, the described method injecting foamed material several times in dies cavity is:
Adopt rifle head to foam-injection material in dies cavity;
Injected a bit, mobile rifle head or foaming mould, lower some foamed materials of injection in dies cavity, until injected.
Further, the technological parameter adopted when injecting foamed material in dies cavity is: the material temperature of foamed material: 18-20 DEG C; The mould temperature of foaming mould: 45 ± 5 DEG C; Material ratio: 1:1.20-1:1.24; Foamed material injection flow: 1600-1900g/s; The foamed solidification time: 180-300s.
Further, described foamed material injection flow is 1800g/s.
Further, described foamed material is cyclopentanes, 141b, HFC-245fa or Solics LBA physical blowing agent.
Further, the black material of the described foamed material of described composition is organic multiple isocyanate.
Further, the white material of the described foamed material of described composition is PPG.
Further, described PPG comprise at least one degree of functionality be 3 or larger, hydroxyl value be the polyalcohol of 300-800.
The present invention is foamed by the method for multi-point injection, shortens foam flowing time in box cavity, improves production efficiency; And making material before foamable reaction starts, namely flow to each filling position, such foamed material reacts completely, and cell diameter is evenly fine and closely woven, high insulating effect.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of foaming operation in prior art.
Fig. 2 is the process chart of foaming method of the present invention.
Fig. 3 is the operation chart of foaming method of the present invention.
Lines figure after the heat-insulation layer cutting that the foaming method that Fig. 4 is employing prior art obtains.
Lines figure after the heat-insulation layer cutting that Fig. 5 obtains for employing foaming method of the present invention.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the invention will be further described, can better understand the present invention and can be implemented, but illustrated embodiment is not as a limitation of the invention to make those skilled in the art.
As shown in Figure 2, foaming method of the present invention comprises the following steps:
Step 201: make foaming mould;
Step 202: inject foamed material several times in dies cavity, each foamed material drop point injected is different;
Step 203: foamed material foaming and intumescing, until fill full dies cavity.
Wherein, in dies cavity, inject foamed material several times and can adopt following methods:
As shown in Figure 3, adopt frequency conversion rifle head 302, from described foaming mould 301 a bit to foam-injection material 303 mould 301 inner chamber 304, injected a bit, changed injection pressure, again to foam-injection material in mould 301 inner chamber 304, until injected.The technological parameter adopted when injecting foamed material 303 is: the material temperature of foamed material: 18-20 DEG C; The mould temperature of foaming mould: 45 ± 5 DEG C; The material quality ratio forming described foamed material is: 1:1.20-1:1.24; Foamed material injection flow: 1400-2000g/s; The foamed solidification time: 180-300s.Wherein, form in the material quality ratio of described foamed material, the former is isocyanates, and the latter is PPG+blowing agent.By this method, can form multiple foamed material drop point, the flow process of foam in mould shortens.
In dies cavity, inject foamed material several times can also adopt following methods:
Adopt rifle head to foam-injection material in dies cavity;
Injected a bit, mobile rifle head or foaming mould, lower some foamed materials of injection in dies cavity, until injected.The technological parameter adopted when injecting foamed material in dies cavity is: the material temperature of foamed material: 18-20 DEG C; The mould temperature of foaming mould: 45 ± 5 DEG C; Material ratio: 1:1.20-1:1.24; Foamed material injection flow: 1600-1900g/s; The foamed solidification time: 180-300s.Foamed material injection flow is preferably 1800g/s.
Foamed material used in the present invention is made up of black material, white material and blowing agent, and wherein blowing agent is the physical blowing agent such as cyclopentanes, 141b, HFC-245fa or Solics LBA, and black material can be organic multiple isocyanate, and white material can be PPG.Wherein PPG comprise at least one degree of functionality be 3 or larger, hydroxyl value be the polyalcohol of 300-800.
After the heat-insulation layer cutting adopting foaming method of the present invention to produce, can find out that heat-insulation layer has multiple divergence point.Shown in Figure 4, the lines figure after the heat-insulation layer cutting obtained for adopting the foaming method of prior art.As can be seen from the figure, its lines is outwards dispersed centered by a drop point, and relatively close near the position of drop point, and relatively sparse away from the position lines of drop point.Shown in Figure 5 again, the lines figure after the heat-insulation layer cutting obtained for adopting foaming method of the present invention, in this embodiment, have employed two drop points during foaming.Can obviously find out from the lines figure, this embodiment has two divergence points, also namely has two drop points.In the position near drop point, lines is around the about ovalize of drop point; And expand to the periphery again, then the lines of dispersing of two drop points merges mutually, and one-tenth is integrated.Therefore, according to lines shown after heat-insulation layer cutting, easily can judge that this heat-insulation layer have employed foaming method of the present invention.
The above embodiment is only that protection scope of the present invention is not limited thereto in order to absolutely prove the preferred embodiment that the present invention lifts.The equivalent alternative or conversion that those skilled in the art do on basis of the present invention, all within protection scope of the present invention.Protection scope of the present invention is as the criterion with claims.
Claims (11)
1. a foaming method, is characterized in that, comprising:
Make the foaming mould that mould temperature is 45 ± 5 DEG C;
Adopt frequency conversion rifle head, a bit to dies cavity, inject with the flow of 1400-2000g/s the foamed material that material temperature is 18-20 DEG C from described foaming mould, inject a bit, change injection pressure, again inject in dies cavity with the flow of 1400-2000g/s and by mass ratio be: the foamed material of 1:1.20-1:1.24, until injected, wherein each foamed material drop point injected is different, forms the isocyanate material of described foamed material: the mass ratio of PPG+blowing agent is: 1:1.20-1:1.24;
Foamed material foaming and intumescing, until fill full dies cavity, wherein foamed solidification time: 180-300s.
2. foaming method according to claim 1, is characterized in that, the blowing agent forming described foamed material is cyclopentanes, 141b, HFC-245fa or Solics LBA physical blowing agent.
3. foaming method according to claim 1, is characterized in that, the black material forming described foamed material is organic multiple isocyanate.
4. foaming method according to claim 1, is characterized in that, the white material forming described foamed material is PPG.
5. foaming method according to claim 4, is characterized in that, described PPG comprise at least one degree of functionality be 3 or larger, hydroxyl value be the polyalcohol of 300-800.
6. a foaming method, is characterized in that, comprising:
Make the foaming mould that mould temperature is 45 ± 5 DEG C;
Rifle head is adopted in dies cavity, to inject with the flow of 1600-1900g/s the foamed material that material temperature is 18-20 DEG C; Injected a bit, mobile rifle head or foaming mould, injected lower some foamed materials with the flow of 1600-1900g/s in dies cavity, until injected, wherein each foamed material drop point injected is different, material ratio: 1:1.20-1:1.24.
Foamed material foaming and intumescing, until fill full dies cavity, wherein foamed solidification time: 180-300s.
7. foaming method according to claim 6, is characterized in that, described foamed material injection flow is 1800g/s.
8. foaming method according to claim 6, is characterized in that, the blowing agent forming described foamed material is cyclopentanes, 141b, HFC-245fa or Solics LBA physical blowing agent.
9. foaming method according to claim 6, is characterized in that, the black material forming described foamed material is organic multiple isocyanate.
10. foaming method according to claim 6, is characterized in that, the white material forming described foamed material is PPG.
11. foaming methods according to claim 10, is characterized in that, described PPG comprise at least one degree of functionality be 3 or larger, hydroxyl value be the polyalcohol of 300-800.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310288048.2A CN103341944B (en) | 2013-07-10 | 2013-07-10 | Foaming method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310288048.2A CN103341944B (en) | 2013-07-10 | 2013-07-10 | Foaming method |
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| CN103341944A CN103341944A (en) | 2013-10-09 |
| CN103341944B true CN103341944B (en) | 2015-06-24 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106217744A (en) * | 2016-07-25 | 2016-12-14 | 合肥荣事达太阳能有限公司 | A kind of for solar water heater foaming method |
| CN109676853A (en) * | 2019-01-28 | 2019-04-26 | 陈振瑞 | A kind of feed process of molded urethane foaming product |
| CN112140445A (en) * | 2019-06-26 | 2020-12-29 | 青岛海尔电冰箱有限公司 | Refrigerator body foaming method |
| CN114102957A (en) * | 2020-08-31 | 2022-03-01 | 青岛海尔特种制冷电器有限公司 | Box body, preparation method of box body and refrigerator |
| CN114770851B (en) * | 2022-04-12 | 2024-02-06 | 长虹美菱股份有限公司 | Foaming and material injecting method for refrigerator door body |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2811873B2 (en) * | 1990-02-28 | 1998-10-15 | 橋本フォーミング工業株式会社 | Resin molded product and method for producing the same |
| JP3584424B2 (en) * | 1997-08-29 | 2004-11-04 | 株式会社岡村製作所 | Manufacturing method of multilayered different hardness cushion body, multilayered different hardness cushion body manufactured by the method, and seat and back of chair using the cushion body |
| JP3425631B2 (en) * | 1998-05-29 | 2003-07-14 | 三洋昭和パネルシステム株式会社 | Insulation panel manufacturing method |
| JP2000279279A (en) * | 1999-03-30 | 2000-10-10 | Ikeda Bussan Co Ltd | Vehicle seat and its manufacture |
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