CN1013181B - Apparatus for production of films with bubbles using hot plastic materials - Google Patents
Apparatus for production of films with bubbles using hot plastic materials Download PDFInfo
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- CN1013181B CN1013181B CN 85105073 CN85105073A CN1013181B CN 1013181 B CN1013181 B CN 1013181B CN 85105073 CN85105073 CN 85105073 CN 85105073 A CN85105073 A CN 85105073A CN 1013181 B CN1013181 B CN 1013181B
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Abstract
The present invention relates to a device for producing films with multiple bubbles for reducing vibration and isolating layers by using thermoplastic materials, such as polyethylene. After a film which is formed by hot pressing of a T-shaped mould is cooled, the film is heated by an induction heating roller which is provided with a heating sleeve and an inner cooling device; the induction heating roller is not only provided with the heating sleeve in a roller casing, but also provided with an induction coil for heating, and a sealing heat conducting medium between the heating sleeve and the induction coil. The present invention has the characteristics that the present invention can be used as a cooling device for cooling a heat conducting medium; the present invention also has the advantages that the temperature can be raised and lowered quickly, and temperatures are evenly distributed around the roller and along the axial direction of the roller. The device of the present invention can be used for producing the films with multiple bubbles, which have the advantages of no partial lack of fusion, good transparence and high yield.
Description
This invention is one and improves equipment, and the relevant low-density polyethylene film of thermoplastic material-for example that is used for is produced the film that has many single sealing bubbles.
Make the band bubble thermoplastic film that damping and interlayer are used, be referred to as meaning " gas lid " or " bubble bag ".
Usually, shown in Fig. 4 A and 4B, this film is to be called " epiphragma " later on the hot melting plastic film 2(that has a protuberance 2a) be called " notacoria " later on flat plastic sheeting 3() form, the opening edge of epiphragma is sealed formation cavity 4, what have has some variations, for example can be, or with different materials on for example quires is combined in the end face of one deck additional plastic film or other materials fusion at the protuberance of epiphragma 2, make three shape products layer by layer.
The already known processes process of producing above-mentioned band bubble film can be divided into following three types.First type is plastics to be placed on be hot pressed into film in the mould, forms epiphragma when taking advantage of mecystasis, epiphragma and also be that the notacoria that hot pressing is come out from mould contacts, and exerting pressure fuses together double-layer films.Second type, the temporary transient coiling of plastic material launches then, is heated into mecystasis under a suitable temperature, carries out above-mentioned shaping and hot melt operation again.The third type, the hot pressing plastic material is heated to mecystasis immediately after cooling off fast, carry out above-mentioned shaping and hot melt operation then.
The shortcoming of first type of technology is: because notacoria is in high temperature for a long time, the crystalline solid in the plastic material is increased, thereby lose transparency.With film shaped after cooling immediately compare, also have the low problem of rigidity of epiphragma, in addition because notacoria can not be melted, so occur wrinkle easily.
Taking cost into account, the instant mode of production of second type the off line mode of production not as first type, but because of adopting the rolling film that is easy to purchase that the simple advantage of equipment is arranged.The problem that produces with this technology is that the crystallization process of plastic material changes the physical property of film and surface condition, and deposits " the mist layer " that make additive in the process and increase.Because the physical property of plastic material is along with the length of its storage time and holding conditions and different, so be difficult to make product quality to keep unified.
The method that the third type occurs is in order to keep the superiority of instant method than off-line method, and eliminates above mentioned shortcoming.Immediately fast after the cooling, heating can be avoided opacity, and produce hard again, not with the high-quality homogeneous film of wrinkle the plastic material that is hot pressed into film from mould.
Yet, the enforcement that the method for the third type may not be paid easily.Adopting conventional equipment, be unsafty along the axial temperature of film heated roller with to the reactivity of temperature then, and maintenance is also had any problem.
Adopt electric heater the easiest in the roller heating device, but along drum shaft to temperature uniformity can not keep well.When heater breaks down and need to change, needsization long time with a lot of difficulties is arranged.Though heat up than very fast, cooling then needs to wait for heat radiation.
In the factory of steaming plant was arranged, steam also was a kind of effective heater, raise equably along the temperature that axially makes of cylinder, but will change set temperature, then will depend on the adjustment of steam pressure, so can not realize soon.
Heat-conducting medium circulation is used to replace steam to increase temperature effect.The outer field heat-conducting medium of chilling roll can improve the speed of cooling, but it is also not really fast to heat up, and the uniformity of cylinder axial temperature is also not as good with Steam Heating.For axial temperature is raise equably, imagination is adorned a heating jacket in cylinder, and interior dress vapour-liquid two-phase hybrid system has the advantage that needs to be maintained hardly.An induction coil also is housed in the cylinder, temperature is risen rapidly by eddy-current heating.Yet temperature-reactive still can not meet the demands, because cooling needs the time.
In addition, along width be its axial temperature of heated roller of 1200mm distribute be generally ± 5 ℃.So its Temperature Distribution of width along plastic sheeting is uneven, the result causes the film shaped inferior or incomplete fusion of part.Especially the easier appearance of the latter.Adopt certain polyethylene as representational plastic material aerogenesis in next life bubble, the temperature of plastic material is remained in 142 ℃ to 144 ℃ the scope.Temperature is at about 146 ℃ or can cause plastic sheeting to be bonded on the heated roller when above, and when temperature at about 140 ℃ or when following, it is very poor again to fuse.Therefore, adopt existing device with high yield, the product of producing wide region is inconvenient, and uses more lightweight of thin film production, and pliable and tough, the meaning of low cost product is just more obvious.
This invention is intended to solve above-mentioned problem.
The purpose of this invention provides a kind of high yield, the equipment of high-effect production bubble material, and this equipment is applicable to the film of various different materials and various different size specifications, and does not need special technology; Particularly this equipment transparency of products and robustness of producing all increases, and can prevent to occur on notacoria wrinkle.
In the device with plastic material production band bubble film, from the film in the first feed source be fed to two facing to cylinder between, carving a series of pits on one of them cylinder, utilize vacuum draw to form protuberance, this plastic sheeting and the flat plastic sheeting of sending into from the second film source are fused.Producing the equipment that has single sealing bubble film in this invention comprises: the eddy-current heating cylinder, a heating jacket and inner cooling device are housed in the cylinder, and be placed between the above mentioned cylinder and the first or second film feed source; A chilling roll is placed between the eddy-current heating cylinder and each above mentioned first and second film feed source that inner cooling device is housed; The eddy-current heating cylinder that heating jacket and inner cooling device are housed has a drum housing, interior dress heat-conducting medium be sealed in heating jacket and in order to the heating induction coil between the gap.The characteristics of this invention are to cool off the device of this heat-conducting medium.
Epiphragma by the first film feed source is sent into is keeping a suitable temperature equably along its width, passes through chilling roll and heating jacket is housed and the eddy-current heating cylinder of inner cooling device, arrives forming cylinder, forms protuberance.Meanwhile, the notacoria of being supplied with by the second film feed is keeping proper temperature, process chilling roll and the eddy-current heating cylinder arrival shaping roller that heating jacket and inner cooling device are housed of uniformity along thin-film width.Notacoria contacts with the epiphragma with protuberance, and fusion forms above mentioned band bubble film under pressure.
Fig. 1 is a sketch, the part of appliance of diagram this invention.
Fig. 2 is in the used equipment of this invention, and the axial section of the eddy-current heating cylinder of heating jacket and internal heat is housed.
Fig. 3 is along the cut-away view of III-III direction among Fig. 2.
Fig. 4 is the band bubble film of being made by thermoplastic, and A is a plane, and B is a profile.
With reference to accompanying drawing, will illustrate the embodiment of this invention below.
As shown in Figure 1, by the epiphragma 2 of extruder 5 by 6 supplies of the first film feed source T shape mould, through chilling roll 26 coolings, preferably cooling fast, contact with the eddy-current heating cylinder 7 that heating jacket and inner cooling device are housed, be heated to a certain suitable temperature at this drum upper cover film, contact with shaping roller 8, utilize the pit on shaping roller 8 circumference, vacuum forming, form protuberance 2a, meanwhile, the notacoria 3 that extruder 5 is supplied with through the second film feed source T shape mould 9, through chilling roll 27 coolings, preferably cooling fast contacts with the eddy-current heating cylinder that heating jacket and inner cooling device are housed, and notacoria is heated to a suitable temperature and is transported to shaping roller 8 on this heated roller.The opening edge of protuberance 2a on the sealing epiphragma 2.Simultaneously double-layer films is exerted pressure with compressing roller 11, their hot melts are become have the bubble material 1 that seals bubble 4.The bubble filler is peeled off and is reeled with peeling off cylinder 12.
As shown in Figures 2 and 3, eddy-current heating cylinder 7(10) heating jacket and inner cooling device are housed, now be explained as follows.
Core at drum housing 13 is equipped with stationary spindle 17.Induction coil 18 and be arranged on the centre of stationary spindle 17 as the core body 19 of supporting.Form annular seal space 16 between induction coil 18 and the drum housing 13.The two ends of drum housing 13 are supported on the stationary spindle 17 with bearing 20.Between annular seal space 16 and bearing 20, embed encapsulant 21, thereby annular seal space 16 and extraneous air are isolated.
Form another annular seal space 22 in core body 19, lead-in wire 23 is enclosed in this annular seal space, and to induction coil 18 power supplies, lead-in wire 23 passes axle 17 and is connected on the power supply, and power supply does not illustrate on figure.
Cooling device is to form with the many pipelines 24 that have fin, is installed in the annular seal space 16, and cooling medium supply source and cooling medium circulation device are arranged, and both all do not illustrate on figure.The circulation of cooling medium such as water is supplied with and is carried out continuously, shown in figure upward arrow A and B.Heat-conducting medium 25(is silicone oil for example) be stored in annular seal space 16 and 22.
Eddy-current heating cylinder 7(10) heating jacket and inner cooling device are housed, its usage is as follows, by the 23 introducing alternating currents that go between, produces magnetic flux in induction coil 18, makes in the drum housing 13 and generates eddy current, makes temperature rise to high temperature by joule heating effect.As a result, the water in the heating jacket 14 is heated because of draw heat from drum housing 13, vaporization.It is lower that vaporize water flows in the heating jacket temperature, the partial condensation that pressure is lower, and make described part heating, and carry out above-mentioned steps repeatedly, make the surface temperature of drum housing 13 all keep uniformity along circumferential and axial.
At this moment, silicone oil 25 is cooled continuously, for avoiding temperature excessively to raise, can control the voltage of induction coil 18 simultaneously, as controlling with proportional plus integral plus derivative controller (PID).Adopt this method can very simply and promptly realize heating up and cooling.
Owing to can accomplish temperature fast lifting and uniformity of temperature profile, so as plastic sheeting and the eddy-current heating cylinder 7(10 that heating jacket and inner cooling device are housed) when contacting, might keep a suitable temperature.In this example, the gradient of temperature rate can reach 0.8min/ ℃, and along the temperature uniformity of 1200mm axial length can be defined as ± 1 ℃.
Be suitable for making the circulating water circulation, and the flow and the temperature that needn't need to regulate water in the above-mentioned cooling device.
From the epiphragma 2 and the notacoria 3 of T shape mould 6 and 9, after being cooled, roll 7 and 10 by the eddy-current heating tube that heating jacket and inner cooling device are housed and keep the most suitable temperature respectively.Because above-mentioned fast temperature grade is 0.8min/ ℃, thus even when going wrong, also can promptly overcome because of change in film thickness, and because the exospheric temperature variation is very fast, so can improve product yield.Allow the temperature range of hot melt very narrow, along 1200mm axial length temperature uniformity be ± ± 1 ℃, therefore, also can use even its highest peelable temperature of certain material and minimum fusible temperature differ very little.In addition, when notacoria is admitted to cylinder, remain on the minimum of hot melting temperature because of carrying on the back thin 3, so got rid of the possibility that forms wrinkle, transparency then is improved.Simultaneous temperature control is also very simple, only needs to carry out proportional plus integral plus derivative controller (PID) control with the constant flow rate of cooling water.Therefore, do not need the skill of high degree of skill,, realize that unattended is very possible by automatic control.
Example:
Employing has a kind of equipment of said structure, and the eddy-current heating cylinder of two 400mm diameters is housed, and each cylinder respectively has a heating jacket and inner cooling device, is that manufacture of materials is steeped film more with polyethylene, and epiphragma thickness is 80 μ, and notacoria thickness is 40 μ.
List the variations in temperature of each point in the equipment shown in Figure 1 below.Linear velocity is 40m/min.
Point epiphragma notacoria
A，G 250℃ 250℃
B 50℃
H 50℃
C 138℃
D 123℃
E 93℃
I 130℃
F 120℃
J 115℃
K 75℃
L 54℃
M 40℃
Claims (3)
1, be used to produce a kind of equipment with single sealing bubble film, wherein the plastic sheeting from the first film feed source is sent between two cylinders that facing with each other, one of them has a series of pits, along with vacuum draw forms protuberance, this plastic sheeting and the flat plastic sheeting fusion that comes from the second film feed source, described equipment is equipped with the heated roller that is placed in the above-mentioned cylinder between and the first film feed source, also be equipped with the cooling cylinder that is placed between described heated roller and the first film feed source, it is characterized in that, this device also is equipped with another heated roller that is placed in the above-mentioned cylinder between another and the second film feed source, another chilling roll that is placed between described another heated roller and the second film feed source also is housed, described heated roller is the electromagnetic induction heating cylinder, each heated roller all has heating jacket and inner cooling device, described electromagnetic induction heating cylinder contains between heating jacket and heat induced coil, be arranged in the heat-conducting medium of annular seal space, described induction coil is contained in the middle part of drum housing, also contains the device that cools off heat-conducting medium.
2, according to the equipment of claim 1, the water in the heating jacket that it is characterized in that wherein packing into is in decompression state, and the silicone oil of packing into is as heat-conducting medium.
According to the equipment of claim 1, it is characterized in that 3, wherein cooling pipe makes water flow through described pipeline as the cooling device of heater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85105073 CN1013181B (en) | 1985-07-03 | 1985-07-03 | Apparatus for production of films with bubbles using hot plastic materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85105073 CN1013181B (en) | 1985-07-03 | 1985-07-03 | Apparatus for production of films with bubbles using hot plastic materials |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85105073A CN85105073A (en) | 1986-12-31 |
| CN1013181B true CN1013181B (en) | 1991-07-17 |
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ID=4794240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85105073 Expired CN1013181B (en) | 1985-07-03 | 1985-07-03 | Apparatus for production of films with bubbles using hot plastic materials |
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| Country | Link |
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| CN (1) | CN1013181B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011026317A1 (en) * | 2009-09-06 | 2011-03-10 | Li Xiaolong | Manufacturing process for plastic film and plastic film |
| TWI482696B (en) * | 2010-04-13 | 2015-05-01 | Ihi Corp | Induction heating roller apparatus |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1296149C (en) * | 2002-06-22 | 2007-01-24 | 曾世麟 | Modular plastic-wood waste composite product and process for making same |
| FR2877603B1 (en) * | 2004-11-10 | 2007-02-02 | Erca Formseal Sa | PROCESS FOR MANUFACTURING CONTAINERS BY THERMOFORMING AND PLACING DECORATION BANDEROLS ON THESE CONTAINERS |
| JP4598574B2 (en) * | 2005-03-17 | 2010-12-15 | 東芝機械株式会社 | Heating and cooling roll |
| CN100404226C (en) * | 2005-08-19 | 2008-07-23 | 重庆大学 | Inductive hot compacting dies for precision engineering plastic rubber products |
| DE112010002615T5 (en) * | 2009-08-27 | 2012-08-23 | Tokuden Co., Ltd. | Induktionsheizwalzenvorrichtung |
| DE102011108665A1 (en) * | 2011-07-27 | 2013-01-31 | Gallus Druckmaschinen Gmbh | Induction heated cylinder |
| EP2664428B1 (en) * | 2012-05-16 | 2016-03-23 | UHLMANN PAC-SYSTEME GmbH & Co. KG | Sealing roller |
| CN104290313A (en) * | 2014-10-16 | 2015-01-21 | 苏州华冲精密机械有限公司 | Blister mould for food packaging box |
| WO2021018913A1 (en) * | 2019-07-29 | 2021-02-04 | Bossar Holding B.V. | Impulse heat sealing of a heat-sealable film material |
-
1985
- 1985-07-03 CN CN 85105073 patent/CN1013181B/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011026317A1 (en) * | 2009-09-06 | 2011-03-10 | Li Xiaolong | Manufacturing process for plastic film and plastic film |
| TWI482696B (en) * | 2010-04-13 | 2015-05-01 | Ihi Corp | Induction heating roller apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| CN85105073A (en) | 1986-12-31 |
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