CN114851517A - Hot air heat preservation film blowing method and film blowing device - Google Patents
Hot air heat preservation film blowing method and film blowing device Download PDFInfo
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- CN114851517A CN114851517A CN202210592432.0A CN202210592432A CN114851517A CN 114851517 A CN114851517 A CN 114851517A CN 202210592432 A CN202210592432 A CN 202210592432A CN 114851517 A CN114851517 A CN 114851517A
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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
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/885—External treatment, e.g. by using air rings for cooling tubular films
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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
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
- B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
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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
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/89—Internal treatment, e.g. by applying an internal cooling fluid stream
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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
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/91—Heating, e.g. for cross linking
- B29C48/9105—Heating, e.g. for cross linking of hollow articles
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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
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/28—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of blown tubular films, e.g. by inflation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/25—Greenhouse technology, e.g. cooling systems therefor
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
The invention relates to a hot air heat preservation film blowing method, which is characterized by comprising the following steps: when the film bubble is blown out from a die head of the film blowing machine, hot air is blown from the die head to the inside of the film bubble to carry out internal heat preservation on the inner surface of the film bubble, and meanwhile, the outer surface of the film bubble is subjected to external heat preservation by arranging a hot air ring and arranging a transition heating device on a sizing ring; and the extrusion temperature of the die head, the air outlet temperature of the hot air ring, the sizing heating temperature of the sizing ring by the transition heating device and the temperature of the hot air blown inside the sizing ring are sequentially decreased progressively. The hot air heat preservation film blowing method can ensure that the material with higher setting temperature can smoothly blow the film in a proper temperature environment, and improve the stability of the film bubble.
Description
Technical Field
The invention relates to the technical field of film blowing machines, in particular to a hot air heat preservation film blowing method and a film blowing device.
Background
At present, in the production of a film blowing machine, cold air is uniformly blown out of a film bubble through an air ring in the extrusion process, so that an extruded hot film blank is cooled and shaped. The cooling requirements vary from one bubble material to another, with some materials (such as PLA) having a relatively high setting temperature, typically above 200 ℃. However, in the current film blowing operation, the film bubble is in a room temperature environment after being extruded, the room temperature is greatly lower than the extrusion temperature of the film bubble, and even if cold air for shaping is not added, the film bubble still encounters an environment with suddenly reduced temperature after being extruded, so that the physical property of the film bubble after being extruded is changed, the film bubble cannot be shaped smoothly, and the film material is not qualified.
Disclosure of Invention
The invention aims to provide a hot air heat preservation film blowing method which can ensure that a material with higher setting temperature can smoothly blow a film in a proper temperature environment and improve the stability of a film bubble. The technical scheme is as follows:
a hot air heat preservation film blowing method is characterized in that: when the film bubble is blown out from a die head of the film blowing machine, hot air is blown from the die head to the inside of the film bubble to carry out internal heat preservation on the inner surface of the film bubble, and meanwhile, the outer surface of the film bubble is subjected to external heat preservation by arranging a hot air ring and arranging a transition heating device on a sizing ring; and the extrusion temperature of the die head, the air outlet temperature of the hot air ring, the sizing heating temperature of the sizing ring by the transition heating device and the temperature of the hot air blown inside the sizing ring are sequentially decreased progressively.
After the film bubble is extruded from the die head, hot air is blown out from the periphery of the extrusion opening to the film bubble by the hot air ring, and the air outlet temperature of the hot air ring is slightly lower than the extrusion temperature of the die head, so that the material is not in an environment with suddenly reduced temperature after being extruded from the die head, and the material still keeps the physical properties of the material; when the film bubble reaches the sizing ring, the transitional heating device heats the sizing ring to enable the sizing ring to provide a buffer cooling space for the film bubble, the outer side surface of the film bubble is tightly attached to the inner side surface of the sizing ring, so that the film bubble is in a temperature-reducing environment in the sizing ring, and the hot air ring and the transitional heating device jointly form the outer heat preservation of the film bubble between extrusion and foam stabilization; however, the single external heat preservation cannot achieve a good shaping effect, because the distance from the extrusion of the film bubble to the complete shaping of the film bubble is generally long, and the temperature in the film bubble is rapidly reduced at the rear part of the film bubble close to the complete shaping, namely the film bubble between the sizing ring and the bubble stabilizing frame, so that the inner surface of the film bubble shrinks to influence the shaping effect.
As a preferred scheme of the invention, the hot air ring is arranged at the extrusion port of the die head of the film blowing machine, and the air outlets of the hot air ring are uniformly distributed along the outer circumference of the extrusion port of the die head; the air inlet of the hot air ring is connected with an external hot air device. The external hot air device conveys hot air to the hot air ring, so that the hot air ring uniformly blows out the hot air around the extrusion opening of the die head.
As a further preferable scheme of the invention, the transitional heating device is arranged on the outer peripheral surface of the sizing ring, the transitional heating device comprises at least three heating rings, and the average temperature difference between two adjacent heating rings is lower than 50 ℃. The number of the heating rings is at least three, so that the bubble has enough cooling and buffering stages in the sizing ring; meanwhile, the average temperature difference between two adjacent heating rings is also lower than 50 ℃, so that the cooling temperature of the film bubble in the sizing ring can be in a small-amplitude continuous gradual reduction process along the film blowing direction, and the change of the physical properties of the material caused by the overlarge cooling temperature reduction of the film bubble is avoided.
In a further preferred embodiment of the present invention, when the film bubble is blown out from the die head of the film blowing machine, an internal hot air blowing pipe is used to blow hot air from the die head to the inside of the film bubble, and an air inlet of the internal hot air blowing pipe is connected to an internal hot air device.
As a still further preferable scheme of the present invention, the air outlet of the internal heat blowpipe extends from the center of the die head and passes through the sizing ring to the front end of the bubble stabilizing frame, and the internal heat blowpipe is concentric and coaxial with the sizing ring and the bubble stabilizing frame of the film blowing machine. The internal heat blowpipe is concentric and coaxial with the sizing ring and the bubble stabilizing frame, so that the internal heat blowpipe can blow hot air to the center of the bubble, the temperature reduction of the bubble is more uniform, the temperature of the bubble in the bubble stabilizing process gradually tends to the room temperature, and finally the bubble is shaped smoothly.
The external hot air device and the internal hot air device can generate hot air by adopting a fan to send out cold air and then heating the cold air by an air heating furnace.
For the hot air heat preservation film blowing method, the invention also provides a hot air heat preservation film blowing device, which adopts the following technical scheme:
the utility model provides a hot-blast heat preservation blown film device, includes die head, wind ring, sizing ring and bubble stabilizing frame, and die head, wind ring, sizing ring and bubble stabilizing frame set gradually its characterized in that according to the blown film direction: the device also comprises an external hot air device, an internal hot air device and a transition heating device; the air inlet of the air ring is connected with an external hot air device; an internal heat blowpipe is arranged in the die head, an air inlet of the internal heat blowpipe is connected with an internal hot air device, an air outlet of the internal heat blowpipe penetrates through the sizing ring from the center of the die head and extends to the bubble stabilizing frame, and the internal heat blowpipe is concentric and coaxial with the sizing ring and the bubble stabilizing frame of the film blowing machine; the transition heating device is arranged on the outer peripheral surface of the sizing ring.
Above-mentioned die head, wind ring, sizing ring and steady bubble frame set up according to the blown film direction, are adapted to the blown film mode of blown film or lower blown film on the general inflation film manufacturing machine.
In a preferred embodiment of the present invention, the transient heating device includes at least three heating rings, and the heating rings are disposed on an outer circumferential surface of the sizing ring along a longitudinal direction of the sizing ring. The heating ring adopts an electric heating mode, and usually adopts an electric heating wire and the like.
As a further preferable scheme of the invention, the external hot air device comprises an external fan and an external air heating furnace, an air outlet of the external fan is connected with an air inlet of the external air heating furnace, and an air outlet of the external air heating furnace is connected with an air inlet of the air ring; the internal air heating device comprises an internal fan and an internal air heating furnace, an air outlet of the internal fan is connected with an air inlet of the internal air heating furnace, and an air outlet of the internal air heating furnace is connected with an air inlet of the internal heat blowing pipe. The inner hot air device and the outer hot air device both adopt fans to supply air, and cold air blown out by the fans is heated by the heating furnace to form hot air which is respectively sent to the inner hot air blowing pipe and the air ring.
Compared with the prior art, the invention has the following advantages:
the invention adopts a method for simultaneously carrying out external heat preservation and internal heat preservation on a film bubble in the extrusion process of the film bubble, hot air is blown from the periphery of an extrusion opening to the film bubble by a hot air ring, a transitional heating device heats a sizing ring to enable the sizing ring to provide a buffer cooling space for the film bubble, hot air is blown into the film bubble to carry out internal heat preservation on the film bubble from the inside of the film bubble, the extrusion temperature of a die head, the air outlet temperature of the hot air ring, the sizing heating temperature of the sizing ring by the transitional heating device and the temperature of the hot air blown into the inner portion are sequentially reduced in a descending manner, so that the film bubble can be gradually cooled to room temperature from the extrusion temperature and finally cooled and shaped, the film bubble is in a transitional cooling state in the extrusion process, thereby ensuring that the material with higher shaping temperature can smoothly blow the film in the proper temperature environment and improving the stability of the film bubble.
Drawings
FIG. 1 is a schematic structural view of a preferred embodiment of the present invention;
FIG. 2 is an enlarged view of A in FIG. 1;
wherein, each is marked as: 1-die head, 2-air ring, 3-sizing ring, 4-foam stabilizing frame, 5-external hot air device, 501-external fan, 502-external air heating furnace, 6-internal hot air device, 601-internal fan, 602-internal air heating furnace, 7-transition heating device, 701-heating ring and 8-internal hot air blowing pipe.
Detailed Description
The following further describes the preferred embodiments of the present invention with reference to the accompanying drawings.
As shown in fig. 1 and 2, a hot air heat preservation film blowing device comprises a die head 1, an air ring 2, a sizing ring 3, a bubble stabilizing frame 4, an external hot air device 5, an internal hot air device 6 and a transition heating device 7; the die head 1, the wind ring 2, the sizing ring 3 and the foam stabilizing frame 4 are sequentially arranged according to the film blowing direction; the air outlets of the air rings 2 are uniformly distributed along the outer periphery of the extrusion opening of the die head 1, the air inlets of the air rings 2 are connected with an external hot air device 5, the external hot air device 5 comprises an external fan 501 and an external air heating furnace 502, the air outlets of the external fan 501 are connected with the air inlets of the external air heating furnace 502, and the air outlets of the external air heating furnace 502 are connected with the air inlets of the air rings 2; an internal heat blowpipe 8 is arranged in the die head 1, an air inlet of the internal heat blowpipe 8 is connected with an internal hot air device 6, an air outlet of the internal heat blowpipe 8 penetrates through the sizing ring 3 from the center of the die head 1 and extends to the bubble stabilizing frame 4, and the internal heat blowpipe 8 is concentric and coaxial with the sizing ring 3 and the bubble stabilizing frame 4 of the film blowing machine; the internal hot air device 6 comprises an internal fan 601 and an internal air heating furnace 602, the air outlet of the internal fan 601 is connected with the air inlet of the internal air heating furnace 602, and the air outlet of the internal air heating furnace 602 is connected with the air inlet of the internal hot air blowing pipe 8; the transition heating device 7 comprises three heating rings 701, and the heating rings 701 are arranged on the outer peripheral surface of the sizing ring 3 along the length direction of the sizing ring 3.
The hot air heat preservation and film blowing method of the present invention will be described in further detail with reference to preferred embodiments of the hot air heat preservation and film blowing apparatus.
The external hot air device 5 adopts a fan to supply air, and cold air blown out by the fan is heated by the heating furnace to form hot air which is sent to the air ring 2, so that the air ring 2 becomes a hot air ring blowing out the hot air. After the film bubble is extruded from the die head 1, the air ring 2 uniformly blows hot air to the film bubble at the periphery of the extrusion opening of the die head 1, and the air outlet temperature of the hot air ring 2 is slightly lower than the extrusion temperature of the die head 1, so that the material is not in an environment with suddenly reduced temperature after being extruded from the die head 1, and the material still keeps the physical properties of the material.
The transition heating device 7 comprises three heating rings 701, the three heating rings 701 are arranged on the outer peripheral surface of the sizing ring 3 along the length direction of the sizing ring 3 to heat the sizing ring 3, and the adequate cooling and buffering stage of the film bubble in the sizing ring 3 is ensured; the film bubble reaches the sizing ring 3, the sizing ring 3 provides a buffering and cooling space for the film bubble, the outer side surface of the film bubble is tightly attached to the inner side surface of the sizing ring 3, so that the film bubble is in a temperature gradually-decreasing environment in the sizing ring 3, the average temperature difference between every two adjacent heating rings 701 is lower than 50 ℃, the cooling temperature of the film bubble in the sizing ring 3 can be in a small-amplitude continuous gradually-decreasing process along the film blowing direction, and the phenomenon that the physical property of the material of the film bubble is changed due to the fact that the cooling temperature is too large in amplitude is avoided.
The hot-blast ring 2 and the transition heating device 7 jointly constitute the outer heat preservation of bubble extruding to between the bubble, however, the independent outer heat preservation can not reach better design effect, because, it is generally longer to extrude the distance that the bubble was finalized completely from the bubble, be close to the rear portion of finalizing completely at the bubble, be in the bubble between sizing ring 3 and bubble stabilizing frame 4 promptly, the temperature in its bubble reduces fast, lead to the shrink of bubble internal surface and influence design effect, for solving this easy neglected but very important problem, further adopt interior heat blowing pipe 8 to the bubble inside and blow hot-blast, carry out interior heat preservation to the bubble from the inside of bubble, and set up the temperature that blows hot-blast inside to be less than sizing heating temperature. Internal hot-blast device 6 adopts the fan to supply air, and the cold wind that the fan blew out forms hot-blast sending to internal hot blowpipe 8 through the heating furnace heating, and internal hot blowpipe 8's air outlet extends and passes sizing ring 3 to foam stabilizing frame 4 front end from 1 center of die head, and internal hot blowpipe 8 is concentric coaxial with the sizing ring 3 of inflation film manufacturing machine, foam stabilizing frame 4, makes internal hot blowpipe 8 can blow out hot-blast to the center of bubble, makes the cooling of bubble more even, makes the temperature of bubble at the foam stabilizing in-process tend to the room temperature gradually. Along with the continuous extrusion of the film bubble, the temperature of hot air blown out by the internal heat blowing pipe 8 is gradually reduced along the film blowing direction, so that the film bubble can be gradually cooled to room temperature from the extrusion temperature and finally cooled and shaped, and the film bubble is in a transitional cooling state in the extrusion process.
Furthermore, it should be noted that the names of the parts of the embodiments described in the present specification may be different, and the equivalent or simple changes of the structures, the features and the principles described in the present patent concept are included in the protection scope of the present patent. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (8)
1. A hot air heat preservation film blowing method is characterized in that: when the film bubble is blown out from a die head of the film blowing machine, hot air is blown from the die head to the inside of the film bubble to carry out internal heat preservation on the inner surface of the film bubble, and meanwhile, the outer surface of the film bubble is subjected to external heat preservation by arranging a hot air ring and arranging a transition heating device on a sizing ring; and the extrusion temperature of the die head, the air outlet temperature of the hot air ring, the sizing heating temperature of the sizing ring by the transition heating device and the temperature of the hot air blown inside the sizing ring are sequentially decreased progressively.
2. The hot air heat preservation film blowing method according to claim 1, characterized in that: the hot air ring is arranged at the extrusion port of the die head of the film blowing machine, and the air outlets of the hot air ring are uniformly distributed along the outer circumference of the extrusion port of the die head; the air inlet of the hot air ring is connected with an external hot air device.
3. The hot air heat preservation film blowing method according to claim 2, characterized in that: the transition heating device is arranged on the outer peripheral surface of the sizing ring and comprises at least three heating rings, and the average temperature difference between every two adjacent heating rings is lower than 50 ℃.
4. The hot air insulation film blowing method according to any one of claims 1 to 3, characterized in that: when the film bubble is blown out from the die head of the film blowing machine, an internal hot blast pipe is adopted to blow hot air from the die head to the inside of the film bubble, and an air inlet of the internal hot blast pipe is connected with an internal hot air device.
5. The hot air heat preservation film blowing method according to claim 4, characterized in that: the air outlet of the internal heat blowpipe extends from the center of the die head and penetrates through the sizing ring to the front end of the bubble stabilizing frame, and the internal heat blowpipe is concentric and coaxial with the sizing ring and the bubble stabilizing frame of the film blowing machine.
6. The hot air heat preservation film blowing device comprises a die head, an air ring, a sizing ring and a foam stabilizing frame, wherein the die head, the air ring, the sizing ring and the foam stabilizing frame are sequentially arranged according to the film blowing direction, and the hot air heat preservation film blowing device is characterized in that: the device also comprises an external hot air device, an internal hot air device and a transition heating device; the air inlet of the air ring is connected with an external hot air device; an internal heat blowpipe is arranged in the die head, an air inlet of the internal heat blowpipe is connected with an internal hot air device, an air outlet of the internal heat blowpipe penetrates through the sizing ring from the center of the die head and extends to the bubble stabilizing frame, and the internal heat blowpipe is concentric and coaxial with the sizing ring and the bubble stabilizing frame of the film blowing machine; the transition heating device is arranged on the outer peripheral surface of the sizing ring.
7. The hot air heat preservation and film blowing device according to claim 6, characterized in that: the transition heating device comprises at least three heating rings, and the heating rings are arranged on the outer peripheral surface of the sizing ring along the length direction of the sizing ring.
8. The hot air heat preservation and film blowing device according to claim 6 or 7, characterized in that: the external hot air device comprises an external fan and an external air heating furnace, an air outlet of the external fan is connected with an air inlet of the external air heating furnace, and an air outlet of the external air heating furnace is connected with an air inlet of the air ring; the internal air heating device comprises an internal fan and an internal air heating furnace, an air outlet of the internal fan is connected with an air inlet of the internal air heating furnace, and an air outlet of the internal air heating furnace is connected with an air inlet of the internal heat blowing pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210592432.0A CN114851517B (en) | 2022-05-28 | 2022-05-28 | Hot air heat preservation film blowing method and film blowing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210592432.0A CN114851517B (en) | 2022-05-28 | 2022-05-28 | Hot air heat preservation film blowing method and film blowing device |
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| CN114851517A true CN114851517A (en) | 2022-08-05 |
| CN114851517B CN114851517B (en) | 2024-05-14 |
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| CN104015349A (en) * | 2014-06-10 | 2014-09-03 | 四川大学 | Online thermal control device and method of PLA (polylactic acid) blown film |
| CN208543811U (en) * | 2018-06-15 | 2019-02-26 | 上海海湾石化有限公司 | A kind of double vane film cooling apparatus |
| CN109263029A (en) * | 2018-09-03 | 2019-01-25 | 广东金明精机股份有限公司 | Inflation film manufacturing machine vesicle diameter regulation device and regulation method |
| CN112571776A (en) * | 2020-11-24 | 2021-03-30 | 中国科学技术大学 | Film blowing device for realizing transverse blowing of liquid crystal polymer and preparation method |
| CN216400536U (en) * | 2021-11-19 | 2022-04-29 | 江门市江海区大坤塑料制品有限公司 | Film blowing machine |
| CN114248414A (en) * | 2021-12-13 | 2022-03-29 | 宁波长阳科技股份有限公司 | Film blow molding device and liquid crystal polymer film prepared by same |
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