CN1923492A - Process for controlling puffing via temperature - Google Patents
Process for controlling puffing via temperature Download PDFInfo
- Publication number
- CN1923492A CN1923492A CNA2006101220822A CN200610122082A CN1923492A CN 1923492 A CN1923492 A CN 1923492A CN A2006101220822 A CNA2006101220822 A CN A2006101220822A CN 200610122082 A CN200610122082 A CN 200610122082A CN 1923492 A CN1923492 A CN 1923492A
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- CN
- China
- Prior art keywords
- temperature
- expanded
- puff
- heating
- puffing
- 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.)
- Pending
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Classifications
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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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
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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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
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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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
- B29C2948/92895—Barrel or housing
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92923—Calibration, after-treatment or cooling zone
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Formation And Processing Of Food Products (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention relates to a method for using temperature to control expansion. Wherein, it comprises that passing material through extruder, in the expansion and cooling shaping processes, adjusting the temperature around the expander, to improve the controllability, to obtain high-quality product.
Description
Technical field
The present invention relates to the extrusion processing technology field, specifically, relate to a kind of by the expanded method of temperature control.
Background technology
Expanded is a kind of technology of the widely used change mechaanical property of materials, and material is through after expanded, and bulk density reduces, and the shock-resistant ability of material improves.Puffing technique is in packing, and sector applications such as building, food and feed are extensive.
In the extrusion pressing puffing process of general macromolecular material, the boiling point of the swelling agent that adopts is very low, and high molecular fusing point is higher, and vitrification point is higher, after material leaves the extruder mouth, swelling agent volatilizees substantially fully, in follow-up cooling procedure, condensation can not take place in swelling agent yet, causes the pressure drop in the puff bubble, therefore, existing processes is not strict to the temperature control requirement in the puffing process.
In some synthetic material bulking process, extrudate is introduced in the mould of an insulation expanded sometimes, its objective is control extrudate flowing and the surperficial form of puff in mould.In the other extruding-puffing technique, extruded body will its objective is control puff configuration of surface and texturized surface density through the mould rod cooling and shaping of a cooling.In other extrusions, material is a process that freedom is expanded after leaving extruding dies, in this process, after material leaves extruding dies, the volatilization of its temperature and swelling agent, the rheological characteristic of material are interrelated, by prescription and the decision of the temperature when leaving extruder, the Modulatory character of production is little fully for expanded level and shrinkage degree.For expanded as starch of the material that the special flow sex change is much arranged expanded, because the melt temperature of starch self is higher than its decomposition temperature, add and to add a large amount of moisture man-hour, it can be processed at a lower temperature, but the adding of a large amount of moisture, reduced the melt strength of system on the one hand, had a strong impact on the expanded of starch, on the other hand, a large amount of moisture causes residual moisture content height in the expanded foam, expanded foams shrink in cooling procedure and subside, and influence the quality of expanded system.
Summary of the invention
The objective of the invention is to overcome the problem that existing puff exists in puffing process, provide a kind of,, obtain high-quality product to increase substantially the controllability of puffing process by the expanded method of temperature control.
Puffing process medium power at material is the steam pressure that swelling agent gasification back produces, and the resistance in the puffing process is the tensile viscosity and the surface tension of material.These factors all are subjected to the Temperature Influence of extrudate, and in common free wxpansion process, variation of temperature is by the gasification of swelling agent, and puff is the factor decision of heat radiation outwards, and variation of temperature influences the gasification rate and the degree of swelling agent conversely.Temperature also has very big influence to the tensile viscosity of material.Therefore whole puffing process is the process of a coupling, and it is difficult regulating by process adjustments before expanded and prescription.The relative optimizing process that known technical study is all carried out on the expanded basis of this freedom.
Be lower than the system of melt temperature for some decomposition temperatures, usually needing to add a large amount of plasticizer just can process, though plasticizer helps plasticizing processing, often to expanded unfavorable, in starch-based product expanded, the moisture that all is adding in the batching generally speaking is few more, puffed degree is high more, but moisture is few, and mechanical energy consumption is big, starch burns easily, and influence is produced.But moisture adds too much, and in puffing process, bubble breaks easily, though expanded dosage is big, the final puffed degree of system is still smaller.Jiahua Zhou etc. has carried out deep research to this phenomenon.
The temperature-controlled process of puffing process of the present invention, be at material by behind the extruder, in treating the expanded and cooling and shaping process of puff, the temperature around the puff is regulated control.And then the melt viscosity (ability of resistance that bubble is expanded and envelope gas), the evaporating capacity (power of foaming of swelling agent of control foaming system, the contraction that foaming back system causes because of the swelling agent condensation), the cooling velocity of puff, reach the overall expanded purpose of control foaming system.
The above-mentioned method that temperature around the puff is regulated control comprises heating using microwave, infrared heating, and eddy-current heating, Steam Heating or heat transferring medium conduct heat or its combination.So long as the adjusting material temperature is not destroyed the heater and the method for expanded system and can be used.For water-fast materials such as plastics, can consider that steam directly heats, for the hydrophilic material of starch one class, then can consider hot-air or steam-dry air mixture heating, perhaps dry air heating.
The above-mentioned method that temperature around the puff is regulated control is meant the puff temperature is controlled at and is higher than environment temperature.For example, the puff temperature is controlled at 110～120 ℃.
The bulking machine that uses in expanded can be a single-screw extrusion machine, it also can be twin (double) screw extruder, also can be other any type of extruder or mixing arrangement, its effect is exactly mixing of materials, heating and forms certain pressure, material can not take place expanded when breaking away from this device, also can take place expanded.
In the material puffing process, keep system temperature on the boiling point of swelling agent, can reduce the contraction of system to a certain extent, the deformation that helps keeping intumescent system helps improving dilation on the other hand on the one hand.For adopting high boiling intumescent system, the employing native system helps controlling expanded, can produce secondary puffing or be called the expanded of prolongation.The once expanded similar microwave bulking of this secondary puffing or prolongation, lasting heating in the puffing process, can regulate temperature, make remaining swelling agent volatilization, system continues expanded, even bubble broke at the expanded initial stage, remaining moisture still might carry out secondary puffing to extrudate, and produces new bulked structure.
Temperature control equipment also can with additive method and usefulness, as can with vacuum systems and usefulness, after promptly extrudate leaves mouthful mould, enter immediately in the vacuum system, in vacuum system simultaneously to extrudate heating, so that control the expanded of extrudate better.
Compared with prior art, the present invention has following beneficial effect: temperature control equipment not only can be controlled the expanded of extrudate, and can control the contraction of extrudate, when particularly material contains the more situation of swelling agent in extrusion, can delay the swelling agent cooling velocity, make air have more time to infiltrate in the foaming body, reduce the negative pressure that extrudate causes owing to the swelling agent condensation in cooling procedure.Temperature by the control puff later stage can significantly reduce the contraction of foaming system.Temperature-controlled process of the present invention has increased substantially the controllability of puffing process, obtains high-quality product.
The specific embodiment
Comparative example 1
At amylomaize (amylose content 70%) 79% (weight fraction, down with), water 20.5%, 8000 talcum powder 0.5%, mix add after the granulation double screw extruder that rotates in the same way extrude expanded, Temperature Distribution 80-120-150-150 ℃.Spiro rod length 70mm.Screw speed 120rpm, port mould diameter 4mm.25 ℃ of environment temperatures, humidity 65%.The bubbles number of the cross section unit square of the employing of bubble density centimetre is represented.Because the cross section may take in the calculating of bubble density by any cross section of a bubble, down together.
Comparative example 2
At amylomaize (amylose content 70%) 75% (weight fraction, down with), water 24.5%, talcum powder 0.5%, mix add after the granulation double screw extruder that rotates in the same way extrude expanded, Temperature Distribution 80-120-150-150 ℃.Spiro rod length 70mm.Screw speed 120rpm, port mould diameter 4mm.25 ℃ of environment temperatures, humidity 65%.
Comparative example 3
At amylomaize (amylose content 70%) 75% (weight fraction, down with), water 29.5%, talcum powder 0.5%, mix add after the granulation double screw extruder that rotates in the same way extrude expanded, Temperature Distribution 80-120-150-150 ℃.Spiro rod length 70mm.Screw speed 120rpm, port mould diameter 4mm.25 ℃ of environment temperatures, humidity 65%.
Embodiment 1
Implementation condition still adopts heating using microwave with comparative example 1, and puff is 10 seconds time of staying in microwave system, and the puff temperature remains on 110 ℃.
Embodiment 2
Implementation condition still adopts heating using microwave with comparative example 2, and puff is 10 seconds time of staying in microwave system, and the puff temperature remains on 115 ℃.
Embodiment 3
Implementation condition still adopts heating using microwave with comparative example 3, and puff is 10 seconds time of staying in microwave system, and the puff temperature remains on 120 ℃.
Table 1, the influence expanded of different expanded condition to starch
| Bubble density (individual/square centimeter) | Puffed degree mL/g | Color and luster | |
| Comparative example 1 | 29 | 4.4 | Yellowish |
| Comparative example 2 | 24 | 3.6 | White |
| Comparative example 3 | 17 | 2.4 | White |
| Embodiment 1 | 39 | 4.9 | Yellowish |
| Embodiment 2 | 37 | 4.8 | White |
| Embodiment 3 | 34 | 4.5 | White |
The result of table 1 shows by to the control of the temperature in the puff puffing process, can significantly improve puffed degree in one day.
Claims (3)
1, a kind of by the expanded method of temperature control, it is characterized in that at material by behind the extruder, in treating the expanded and cooling and shaping process of puff, the temperature around the puff is regulated control.
2, the method for claim 1 is characterized in that, describedly temperature around the puff is regulated control comprises heating using microwave, infrared heating, eddy-current heating, Steam Heating or heat transferring medium heating or its combination.
3, the method for claim 1 is characterized in that, describedly temperature around the puff is regulated control is meant the puff temperature is controlled at and is higher than environment temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101220822A CN1923492A (en) | 2006-09-12 | 2006-09-12 | Process for controlling puffing via temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101220822A CN1923492A (en) | 2006-09-12 | 2006-09-12 | Process for controlling puffing via temperature |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1923492A true CN1923492A (en) | 2007-03-07 |
Family
ID=37816403
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006101220822A Pending CN1923492A (en) | 2006-09-12 | 2006-09-12 | Process for controlling puffing via temperature |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1923492A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104098930A (en) * | 2014-06-27 | 2014-10-15 | 成都新柯力化工科技有限公司 | Single-sheet talcum powder and preparation method thereof |
| CN108245492A (en) * | 2016-12-29 | 2018-07-06 | 湖南尔康制药股份有限公司 | A kind of preparation method of ranitidine hydrochloride capsules |
-
2006
- 2006-09-12 CN CNA2006101220822A patent/CN1923492A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104098930A (en) * | 2014-06-27 | 2014-10-15 | 成都新柯力化工科技有限公司 | Single-sheet talcum powder and preparation method thereof |
| CN104098930B (en) * | 2014-06-27 | 2015-11-18 | 成都新柯力化工科技有限公司 | A kind of monolithic talcum powder and preparation method thereof |
| CN108245492A (en) * | 2016-12-29 | 2018-07-06 | 湖南尔康制药股份有限公司 | A kind of preparation method of ranitidine hydrochloride capsules |
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