CN102166819A - Film-thickness precise control device of film blowing machine - Google Patents
Film-thickness precise control device of film blowing machine Download PDFInfo
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- CN102166819A CN102166819A CN2011100246652A CN201110024665A CN102166819A CN 102166819 A CN102166819 A CN 102166819A CN 2011100246652 A CN2011100246652 A CN 2011100246652A CN 201110024665 A CN201110024665 A CN 201110024665A CN 102166819 A CN102166819 A CN 102166819A
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- film
- control device
- thermal treatment
- treatment zone
- die lip
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- Extrusion Moulding Of Plastics Or The Like (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
The invention relates to a control device of a film blowing machine, in particular to a film-thickness precise control device of a film blowing machine, which comprises a die head. The film-thickness precise control device is characterized in that the outer edge of an outer die lip of the die head is uniformly provided with at least eight heating regions, the heating regions are internally provided with heating rods and thermocouples and are isolated through insulated tanks, and arc lengths of the heating regions at the gaps of the die lip are less than 24mm. The invention can be used for controlling the temperature difference of adjacent heating regions to reach +/-10 DEG C, thereby realizing large change of material flowability, ensuring that the extruded film has more uniform thickness and greatly improving the quality of films.
Description
Technical field:
The present invention relates to a kind of inflation film manufacturing machine control device, specifically a kind of inflation film manufacturing machine thickness accurate control device.
Technical background:
Inflation film manufacturing machine is the equipment that generally uses in the plastic sheeting processing industry.Adopting the inflation method form film is a quite complicated process, and process conditions have a significant impact film performance, particularly film gauge uniformity.Therefore the film precision is evenly extruded and is become an important development trend just day by day, and the die lip position that plastic sheeting is extruded then is to realize accurate key position and the precondition of extruding.
In die head device, plastic raw materials is in molten condition under the high temperature heating, studies show that along with the rising of temperature, the viscosity of plastic melt is the exponential function mode and descends.This be because, temperature raises, and must make that the motion between intermolecular, strand is accelerated, thereby make the winding between the plastic molecules chain reduce, the distance between the molecule increases, thereby causes viscosity to reduce.At present in the inflation method film production, film gauge uniformity is regulated generally two kinds of methods, a kind of is to solve by manually or automatically regulating the die lip gap length, as utility model patent: a kind of plastic film blowing machine die head exit gap self-checking device (patent No. ZL200820045584.4), changing the die lip gap length by principle of expanding with heat and contracting with cold exactly reaches, the method shortcoming is that regulating effect is poor, cycle, long waste product was many, and must embed the copper alloy thermo-sensitive material in the die lip, chemical reaction at high temperature takes place with plastic melt and generates the charcoal dirt in this material easily, thereby cause gap, die lip place to change, the time is once the long regulating effect that loses.Another kind method is to adopt automatic vane, regulate by the air quantity or the temperature that change each position of vane, the method shortcoming is that automatic vane involves great expense and accessory damages easily, and the regular maintenance expense is high, and vane does not almost have regulating effect to the downward-blowing water-cooling blown film automatically in addition.In view of this, controlling die lip megadyne temperature degree by precision is optimal selection, as utility model patent: a kind of plastic film blowing machine die head exit automatic temperature control device (patent No. ZL200820045586.3), exactly by changing the device that the temperature realization is evenly extruded, but this device weak point is: each die lip discharging opening temperature does not have separate opening, can't realize the big temperature difference in the control procedure, thereby can't realize causing the film gauge uniformity regulating effect not good to the bigger change of material fluidity.
Summary of the invention:
Purpose of the present invention is exactly at the deficiencies in the prior art, a kind of inflation film manufacturing machine thickness accurate control device is provided, it can control each contiguous thermal treatment zone temperature difference and reach ± and 10 ℃, thereby realize the bigger change of material fluidity, make the film thickness of extruding more even, thereby improved the quality of product greatly.
Technical scheme of the present invention is achieved in that it comprises die head, is characterized in that: the die lip outer rim evenly is provided with the thermal treatment zone outside die head, and heating rod and thermocouple are installed in the thermal treatment zone, isolates by heat dam between each thermal treatment zone.The described thermal treatment zone is no less than 8, and each thermal treatment zone in die lip gap location arc length less than 24mm.
The present invention adopts one group along the close independent heating rod of arranging of external mold lockjaw, these heating rods can be made a response to film thickness information, when finding in the film of extruding than thick regional of target, begin to heat up with the corresponding heating rod of die lip, make die lip corresponding site temperature raise this die lip place, zone plastic melt reduced viscosity.In contrast, when finding than thin regional of target in the film of extruding, quit work with the corresponding heating rod of die lip, make die lip corresponding site temperature reduce, this zone die lip plastic melt bulk viscosity becomes big.
Compared with prior art, control device of the present invention has following characteristics:
1, quicker response.Heating rod by the alloyed copper manufacturing has improved heat conductivility, makes that the response speed of system is faster, has improved the sensitiveness to downstream membrane thickness information feedback.
2, the bigger temperature difference is controlled.Around the outer die lip outer rim of die head some independent thermals treatment zone being set evenly, processing heat dam between each thermal treatment zone, have heat insulating function, reduce influencing each other of contiguous Heating Zone Temperature, each contiguous thermal treatment zone temperature difference can reach ± and 10 ℃.
3, simpler maintenance.The heating system of this heating rod and die head is separated from each other, and heating rod can be disassembled from die lip at any time and safeguard that regular maintenance is very convenient and expense is extremely low.
4, arrange more closely.In order to reach the control of better thickness evenness, the independent thermal treatment zone in die lip gap location arc length less than 24mm.
Description of drawings:
Fig. 1 is a die head schematic diagram of the present invention.
Fig. 2 is that the A-A of Fig. 1 is to structural representation.
The specific embodiment:
Below in conjunction with accompanying drawing the present invention is described further:
As shown in Figure 1 and Figure 2, the present invention includes die head 4, evenly be provided with the thermal treatment zone 6, heating rod 1 and thermocouple 3 are installed in the thermal treatment zone 6, isolate by heat dam 2 between each thermal treatment zone in outer die lip 5 outer rims of die head 4.The described thermal treatment zone 6 is no less than 8, and each thermal treatment zone in die lip gap location arc length less than 24mm.
Table 1 specific embodiment of the invention
Claims (2)
1. inflation film manufacturing machine thickness accurate control device, it comprises die head, it is characterized in that: the die lip outer rim evenly is provided with the thermal treatment zone outside die head, and heating rod and thermocouple are installed in the thermal treatment zone, isolates by heat dam between each thermal treatment zone.
2. inflation film manufacturing machine thickness accurate control device according to claim 1 is characterized in that: the described thermal treatment zone is no less than 8, and each thermal treatment zone in die lip gap location arc length less than 24mm.
Priority Applications (1)
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CN2011100246652A CN102166819A (en) | 2011-01-24 | 2011-01-24 | Film-thickness precise control device of film blowing machine |
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CN2011100246652A CN102166819A (en) | 2011-01-24 | 2011-01-24 | Film-thickness precise control device of film blowing machine |
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CN102166819A true CN102166819A (en) | 2011-08-31 |
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CN2011100246652A Pending CN102166819A (en) | 2011-01-24 | 2011-01-24 | Film-thickness precise control device of film blowing machine |
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5116554A (en) * | 1989-10-17 | 1992-05-26 | Tomi Machinery Manufacturing Co. Ltd. | Method of making a film having uniform thickness |
JPH05237918A (en) * | 1991-12-12 | 1993-09-17 | Windmoeller & Hoelscher | Blowing head |
CN201195393Y (en) * | 2008-03-28 | 2009-02-18 | 马镇鑫 | Automatic temperature control apparatus for mould discharge door of plastic film blowing machine |
CN201195391Y (en) * | 2008-03-28 | 2009-02-18 | 马镇鑫 | Automatic temperature control vane of plastic film blowing machine |
CN202037868U (en) * | 2011-01-24 | 2011-11-16 | 湖北恒泰橡塑有限公司 | Precision control device for film thickness of film blowing machine |
-
2011
- 2011-01-24 CN CN2011100246652A patent/CN102166819A/en active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5116554A (en) * | 1989-10-17 | 1992-05-26 | Tomi Machinery Manufacturing Co. Ltd. | Method of making a film having uniform thickness |
JPH05237918A (en) * | 1991-12-12 | 1993-09-17 | Windmoeller & Hoelscher | Blowing head |
CN201195393Y (en) * | 2008-03-28 | 2009-02-18 | 马镇鑫 | Automatic temperature control apparatus for mould discharge door of plastic film blowing machine |
CN201195391Y (en) * | 2008-03-28 | 2009-02-18 | 马镇鑫 | Automatic temperature control vane of plastic film blowing machine |
CN202037868U (en) * | 2011-01-24 | 2011-11-16 | 湖北恒泰橡塑有限公司 | Precision control device for film thickness of film blowing machine |
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Application publication date: 20110831 |