CN103862666A - Film-blowing module head for improving film thickness uniformity of product - Google Patents
Film-blowing module head for improving film thickness uniformity of product Download PDFInfo
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- CN103862666A CN103862666A CN201410125329.0A CN201410125329A CN103862666A CN 103862666 A CN103862666 A CN 103862666A CN 201410125329 A CN201410125329 A CN 201410125329A CN 103862666 A CN103862666 A CN 103862666A
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- 238000010096 film blowing Methods 0.000 title claims abstract description 49
- 229920003023 plastic Polymers 0.000 claims abstract description 43
- 239000004033 plastic Substances 0.000 claims abstract description 43
- 230000001105 regulatory effect Effects 0.000 claims abstract description 5
- 238000007599 discharging Methods 0.000 claims description 5
- 238000012545 processing Methods 0.000 abstract description 4
- 239000002131 composite material Substances 0.000 description 11
- 238000012360 testing method Methods 0.000 description 11
- 239000011248 coating agent Substances 0.000 description 7
- 238000000576 coating method Methods 0.000 description 7
- 239000012528 membrane Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 239000000843 powder Substances 0.000 description 7
- 229920001903 high density polyethylene Polymers 0.000 description 6
- 239000004700 high-density polyethylene Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000011218 segmentation Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- -1 polypropylene ethylene Polymers 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 230000006399 behavior Effects 0.000 description 3
- 229920001400 block copolymer Polymers 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000007750 plasma spraying Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 210000001161 mammalian embryo Anatomy 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 230000009711 regulatory function Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000010345 tape casting Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 241000237858 Gastropoda Species 0.000 description 1
- 239000004594 Masterbatch (MB) Substances 0.000 description 1
- 239000006057 Non-nutritive feed additive Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
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- 238000007747 plating Methods 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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- 238000005507 spraying Methods 0.000 description 1
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Abstract
The invention relates to a film-blowing module head for improving film thickness uniformity of a product, belonging to the technical field of plastics processing. The film-blowing module head comprises a shunt gap, a module lip gap and a choked flow ring, wherein a plastic melt can be divided along a radial direction from the shunt gap and can passes through the module lip gap to axially flow out, and the choked flow ring is used for regulating the flow of the plastic melt from the shunt gap to the module lip gap. The film-blowing module head provided by the invention has the advantages that the choked flow ring is arranged between a plane shunt section and a module lip section, the depth of the embedded plastic melt can flexibly control the flow of each part arranged on the periphery of a module lip by regulating each part of the choked flow ring, the flows of the other parts of the periphery of the module lip are not basically influenced, and the problem that the horizontal thickness of a film-blowing film product is not uniform is solved.
Description
Technical field
The present invention relates to the technical field of device of plastic processing, more particularly, the present invention relates to a kind of film-blowing die head that can improve the horizontal film thickness uniformity of product.
Background technology
In plastic membrane blowing technique, between extruder and film-blowing die head, add that melt metering pump can improve longitudinal thickness uniformity of film product effectively, the thickness uniformity that still how to improve film product is but a technical barrier always.Compared with tape-casting technique, although film-blowing process equipment investment is supported, the feed back producing in production process is few, and product strength is high, and product thickness lack of homogeneity but has usually become to enter the major obstacle of high-end market application.
In tape-casting technique, plastic melt in mould after horizontal shunting, from die lip gap longitudinally flow out, make film product through supercooling.Die lip configuration die lip lash adjusting device, the measured value that can distribute according to the horizontal thickness of product, is adjusted accordingly the die lip gap at each position, therefore the horizontal thickness good uniformity of product.
In film-blowing process, die lip is made up of the gap between columned plug and rigidity cylindraceous outer ring or flexible outer ring.Although outer ring is furnished with the device of adjusting die lip gap, the set screw or the regulating rod that for example circumferentially arrange along the outer wall of outer ring, plastic film blowing machine as disclosed in CN201195392Y, CN1939700A is die head especially used, but applicant finds any one position on die lip circumference and does the adjustment of die lip gap, the die lip gap of other position is impacted all unavoidablely, be especially separated by the position of 180 °.So, for existing blown film mould, adjusting die lip gap very limited to improving the inhomogeneity effect of the horizontal thickness of product, cannot effectively overcome or compensating mold machining precision error.And more seriously, applicant also finds in film-blowing process, the inhomogeneities of the each position of die lip flow, can be exaggerated along with the increase of blow-up ratio and draw ratio.Because the little position of melt flow is propelled the price of more greatly compared with thin being subject to because of film embryo, the large position of melt flow is subject to less propelling the price of compared with thick because of film embryo.Therefore, for film-blowing process, domestic inflation film manufacturing machine is also difficult in the thickness relative standard deviation that laterally reaches 10% at optimal operational condition, and in winding process, also may produce the phenomenon of " sudden and violent muscle ".In the prior art, in order to improve its film thickness uniformity, and in order to guarantee the apparent smooth of film product rolling, usually by rotating die head or rotary winding device, the thickness offset of film product is assigned to equably to each position of Scroll.But the angle of using from product, rotating die head or rotation rolling cannot fundamentally solve the problem of blown film goods transverse gage lack of homogeneity.
In addition, in order to solve the film thickness uniformity problem of blown film product, the technical scheme that uses intelligent vane is also provided on market, its effect is the thickness measuring value according to film product, thereby the intelligent blowing amount of controlling the each position of vane is controlled the local blow-up ratio at the each position of film product, have effect to a certain degree, but the investment of whole device is larger, improve film-blowing process equipment investment, improved the cost of product.
Summary of the invention
In order to solve above-mentioned technical problem of the prior art, the object of the present invention is to provide a kind of film-blowing die head that improves the horizontal film thickness uniformity of product.The present inventor finds by introduce block ring between plane shunting section and die lip section, can control flexibly the flow at each position on die lip circumference by the degree of depth that regulates the each position of block ring to embed plastic melt; And substantially do not affect the flow at other position on die lip circumference, thereby solve the inhomogeneous problem of the horizontal thickness of film product.
In order to solve the described technical problem of invention and to realize goal of the invention, the present invention has adopted following technical scheme:
The film-blowing die head of the horizontal film thickness uniformity of raising product of the present invention, it is characterized in that: comprise a point ebb interval, die lip gap and block ring, and die lip gap axis is radially shunted and passed through to plastic melt to outflow from described point of ebb interval, and described block ring is for regulating the flow that enters the plastic melt in die lip gap from described point of ebb interval.
As preferably, described film-blowing die head comprises die body, die orifice, core rod and block ring; Described mould core rod is arranged in described die orifice, and and described ring-type die orifice between be formed with die lip gap; And described die body is arranged on described core rod below, and between the lower surface of described core rod and the upper surface of described die body, be formed with a point ebb interval; Die lip gap axis is radially shunted and passed through to plastic melt to outflow from described point of ebb interval, and described block ring can regulate the flow that enters the plastic melt in die lip gap from described point of ebb interval by adjusting device.
Selectively, described plastic melt is from central feeding, periphery discharging.
As preferably, described film-blowing die head comprises annular die main body, ring-type die orifice and the core rod of coaxial setting; Described core rod is arranged in described ring-type die orifice, and and described ring-type die orifice between be formed with die lip gap; And described die body is arranged on described ring-type die orifice and core rod below, between the lower surface of described core rod and the upper surface of described die body, be formed with a point ebb interval; On the upper surface of described die body, be provided with two or several helicla flutes, and along described spiral fluted direction of rotation, helicla flute becomes greatly gradually from the radial distance in the described die body lower surface center of circle, and groove depth shoals gradually; To make plastic melt from described spiral fluted origin-to-destination, flowing of plastic melt is that main to gradually become uniform Radial Flow be main from flowing in groove.
Wherein, along with die body upper surface becomes greatly gradually to the radial distance in the center of circle, point ebb interval between described die body upper surface and described core rod lower surface becomes large gradually.
Wherein, corresponding to the intersection of described die lip gap and described point of ebb interval, on the upper surface of described die orifice main body, be provided with block ring, on circumferencial direction on described block ring, the certain distance in interval is provided with slack adjuster, the shunting gap length that described slack adjuster can regulate described block ring to allow plastic melt to pass through.
Wherein, described film-blowing die head also comprises melt feeder, described melt feeder is arranged on the center of described die body, and the top of described melt feeder extends to certain distance in described core rod, and the top of described melt feeder offers melt charging aperture, described melt charging aperture provides melt to described helicla flute by drainage channel; The number of described drainage channel equates with described spiral fluted number, and the upper end of described drainage channel is connected to described melt charging aperture, and the end of described drainage channel is connected to described spiral fluted starting point.
Selectively, described plastic melt is from side direction charging, center discharging.
Wherein, described film-blowing die head comprises annular die main body, ring-type die orifice and core rod; Described core rod is arranged on the center of described ring-type die orifice and annular die main body, and and described ring-type die orifice between be formed with die lip gap; And described die body is arranged on the below of described ring-type die orifice, between the lower surface of described ring-type die orifice and the upper surface of described die body, be formed with a point ebb interval, and along with die body upper surface diminishes gradually to the radial distance in the center of circle, the gap between described die body upper surface and described ring-type die orifice lower surface becomes large gradually; On the upper surface of described die body, be provided with two or several helicla flutes, and along described spiral fluted direction of rotation, helicla flute diminishes gradually from the radial distance in the described die body upper surface center of circle, groove depth shoals gradually; To make plastic melt from described spiral fluted origin-to-destination, flowing of plastic melt is that main to gradually become uniform Radial Flow be main from flowing in groove.
Wherein, corresponding to the intersection of described die lip gap and described point of ebb interval, on the upper surface of described die orifice main body, be provided with block ring, on circumferencial direction on described block ring, the certain distance in interval is provided with slack adjuster, the size of dividing ebb interval that described slack adjuster can regulate described block ring to allow plastic melt to pass through.Described slack adjuster for example can be realized for bevel gear, worm and gear, surface push-rod or other structure of described regulatory function.Plastic melt can enter die lip gap after by this choked flow section.And superpose and can form the film-blowing die head of two-layer or multilayer complex films by two or more die orifice main bodys.With combination die head extruded blown composite membrane of the present invention, not only can control the uniformity of composite membrane gross thickness, can control the thickness uniformity of each individual layer.
Compared with immediate prior art, the film-blowing die head of the horizontal film thickness uniformity of raising product of the present invention has following beneficial effect:
(1) the present inventor finds by research, between film-blowing die head shunting section of the prior art and die orifice flat segments, melt generally flows (such as CN1939700A, CN101298185B etc.) vertically, and block ring must be done moving radially of melt flows vertical direction.And any point is done radially to adjust and can be had influence on other positions on annulus all unavoidablely, thereby cannot realize the independent die lip gap that regulates at each position, other region, especially be separated by the melt flow in region of 180 ° because meeting is subject to larger variation, cannot realize the independent of each position adjusts, thereby cannot solve the thick inhomogeneity problem of the horizontal mould of product, cause horizontal film thickness difference to be difficult to reach below 10%.Introduce block ring by dividing in plane between ebb interval and die lip gap after constantly attempting and designing, can control flexibly the flow at each position on die lip circumference by the degree of depth that regulates the each position of block ring to embed plastic melt; And substantially do not affect the flow at other position, thereby solve the inhomogeneous problem of the horizontal thickness of film product.
(2) except improving the thickness uniformity of film product, another important feature of the present invention is the versatility that has improved single die head.Different plastic raw materials has different flow behaviors, all may there is the variation in flow behavior in even same raw material (temperature and flow etc.) under different processing conditions, difference in these flow behaviors can affect the shunting uniformity of shunting section, thereby impacts the transverse gage uniform distribution of film product.But utilize block ring device that the present invention introduces to regulate the gap of described die body lower surface and core rod upper surface, the inhomogeneities that can flow out shunting section carried out balance again, thereby has improved the versatility of single die head.
(3) superpose and can form the film-blowing die head of two-layer or multilayer complex films by two or more planar disk.Can be used for extruded blown composite membrane with combination die head of the present invention, it not only can control the uniformity of composite membrane gross thickness, but also can control the thickness uniformity of each individual layer.
Accompanying drawing explanation
Fig. 1 is the shaft section structural representation of film-blowing die head described in embodiment 1.
Fig. 2 is along A-A direction sectional structure schematic diagram upwards in Fig. 1.
Fig. 3 is the shaft section structural representation of film-blowing die head described in embodiment 2.
The specific embodiment
Structure, material and the application of the film-blowing die head below with reference to specific embodiment to the horizontal film thickness uniformity of raising product of the present invention are further elaborated, to help those skilled in the art to have more complete, accurate and deep understanding to inventive concept of the present invention, technical scheme; What need statement is to be all exemplary to the description of structure and material in specific embodiment, and does not mean limiting the scope of the invention, and interest field of the present invention is as the criterion with the claim limiting.
embodiment 1
As shown in accompanying drawing 1-2, the film-blowing die head of the horizontal film thickness uniformity of raising product described in the present embodiment, it comprises annular die main body 10, ring-type die orifice 20, core rod 30 and the melt feeder 40 of coaxial setting; Described core rod 30 is arranged in described ring-type die orifice 20, and and described ring-type die orifice between be formed with die lip gap 21, and described die lip gap 21 comprises along extending axially to the vertical section 22 of described core rod bottom surface; And described die body 10 is arranged on described ring-type die orifice 20 and core rod 30 belows, and by fixture 15, described die body 10 is located and is fixed on described ring-type die orifice 20, and make to be formed with point ebb interval 11 between the lower surface of described core rod 30 and the upper surface of described die body 10; On the upper surface of described die body 10, be provided with four helicla flutes 12, and along the direction of rotation of described helicla flute 12, helicla flute becomes large gradually from the radial distance in the described die body lower surface center of circle, and groove depth shoals gradually, and along with the radial distance in the die body lower surface center of circle becomes greatly gradually, the gap between described die body upper surface and described core rod lower surface becomes large gradually; Described melt feeder 40 is arranged on the center of described die body, and the top of described melt feeder 40 extends to the interior certain distance of described core rod 30, be fixed by threaded engagement, and the top of described melt feeder 40 offers melt charging aperture 41, described melt charging aperture 41 provides melt to described helicla flute 12 by drainage channel 42; The axle center place of described core rod 30 is provided with core rod air inlet exit passageway 31, and is provided with the inlet channel 43 that can be communicated to described core rod air inlet exit passageway on described melt feeder; And in the intersection corresponding to described die lip gap and described gap, on the upper surface of described die orifice main body, be also provided with block ring 13, on circumferencial direction on described block ring 13, be provided with a gap adjustment screw rod 14 at interval of 10 degree, the size of dividing ebb interval that described gap adjustment screw rod 14 can regulate described block ring 13 to allow melt to pass through.As preferably, described die lip gap 21 also comprises along the breeze way 23 that axially extends to described vertical section 22 from described core rod upper surface; The number of described drainage channel equates with described spiral fluted number, be 4, and described drainage channel evenly arranges along the bottom of described melt charging aperture, and the upper end of described drainage channel is connected to described melt charging aperture, the end of described drainage channel is connected to described spiral fluted starting point.
embodiment 2
In the present embodiment, described plastic melt is from side direction charging, center discharging.As shown in Figure 3, described film-blowing die head comprises annular die main body 50, ring-type die orifice 60 and core rod 70; Described core rod 70 is arranged on described ring-type die orifice 60 and annular die main body 50 center, and and described ring-type die orifice 60 between be formed with die lip gap 61; And described die body 50 is arranged on the below of described ring-type die orifice 60, between the upper surface of the lower surface of described ring-type die orifice 60 and described die body 50, be formed with point ebb interval 51, and along with die body upper surface diminishes gradually to the radial distance in the center of circle, point ebb interval 51 between described die body 50 upper surfaces and described ring-type die orifice lower surface becomes large gradually; On the upper surface of described die body 50, be provided with two or several helicla flutes 52, and along described spiral fluted direction of rotation, helicla flute diminishes gradually from the radial distance in the described die body lower surface center of circle, groove depth shoals gradually; To make plastic melt from described spiral fluted origin-to-destination, flowing of plastic melt is that main to gradually become uniform Radial Flow be main from flowing in groove.Corresponding to the intersection of described die lip gap and described point of ebb interval, on the upper surface of described die orifice main body, be provided with block ring 80, on circumferencial direction on described block ring 80, the certain distance in interval is provided with slack adjuster 81, the size of dividing ebb interval that described slack adjuster 81 can regulate described block ring to allow plastic melt to pass through.Described slack adjuster for example can be realized for bevel gear, worm and gear, surface push-rod or other structure of described regulatory function.Plastic melt can enter die lip gap after by this choked flow section.And superpose and can form the film-blowing die head of two-layer or multilayer complex films by two or more die orifice main bodys.With combination die head extruded blown composite membrane of the present invention, not only can control the uniformity of composite membrane gross thickness, can control the thickness uniformity of each individual layer.
embodiment 3
The present embodiment is prepared polypropylene ethylene block copolymer film by the film-blowing die head described in embodiment 1, and the parameter of wherein said film-blowing die head and the inflation film manufacturing machine being used in conjunction with and miscellaneous equipment (for example Melt Pump, cooling vane) is as follows:
Shunting section kind: snail, outer processing customization
Helicla flute number: 4
Helicla flute starting point radius: 33 mm
Helicla flute terminal radius: 73 mm
The helicla flute starting point degree of depth: 12.4 mm
Helicla flute starting point outer end gap: 0.6 mm
Helicla flute terminal outer end gap: 1.6 mm
Helicla flute width: 6.0 mm
Helicla flute starting and terminal point differential seat angle: 270 °
Block ring feature: average mark is cut into 36 sections
The maximum gap of choked flow section: 1.6 mm
Block ring width: 12 mm
Choked flow section gap adjusting device: two sections of screw threads, M7x1.0, M8x0.75
Clockwise 360 ° of choked flow section gap degree of regulation: 0.25mm/
Die orifice diameter: 156 mm
Die lip gap: 1.6 mm
Die orifice flat segments length: 50 mm
Extruder: the mono-screw rod of Ф 45mm, Ruian Yun Jiang plastics machinery Co., Ltd
Melt Pump: 20cc/ turns, Zhengzhou Hai Ke Melt Pump Co., Ltd
Cooling vane: the common vane of Ф 420mm
Cooling vane is from die head distance: 30 mm
Cooling water ring: the common water ring of Ф 280mm
Cooling water ring is from die head distance: 350mm.
Described raw material is polypropylene ethylene block copolymer, middle sand (Tianjin) PP66M10T of petrochemical industry Co., Ltd, density 0.905g/cm
3, melt flow rate (MFR) 3.5g/10min.
Temperature control: 160 ℃ of extruder feeding sections; Two sections are 190 ℃ subsequently; 190 ℃ of Melt Pump; 190 ℃ of die heads.
Speed control: Melt Pump rotating speed 30 rpm, while adjusting extruder rotating speed, Melt Pump inlet pressure remains on 1.5 Mpa left and right.
Rolling fabric width: 420 mm
Hauling speed: adjust hauling speed and make film product thickness approach 22 microns.
In the time doing the test of the 1st blown film, the adjustment screw of every section of block ring is tightened clockwise, and hypothesis screw position is now 0 ° film product laterally cut short, the 23.33mm of being often separated by does a mark, makes it the center of corresponding each block ring segmentation.Thickness test value is summarised in table 1.The in the situation that of 21.7 microns of average film thickness, relative standard deviation is 16.3%.There is respectively 27 microns of 14 microns of minimum of a values and maximums 210 ° and 320 ° of positions.Thickness at position, 210 ° of opposites (30 °) is 21 microns.Subaverage; Thickness at position, 320 ° of opposites (140 °) is 23 microns, higher than mean value.As can be seen here, adjustment position, die orifice outer ring is very limited to reducing film thickness error effect.In the 2nd test, it is motionless that position, die orifice outer ring keeps, and thickness is done to the adjustment that reduces gap, melt canal higher than the block ring segmentation of mean value, and its corresponding set screw anglec of rotation is calculated as follows:
Adjust angle=(average film thickness/corresponding points thickness-1) × 250 ° (rounding numerical value)
Table 1 is listed adjusted value, and "-" represents to be rotated counterclockwise.To sub-average block ring segmentation, because corresponding set screw is tightened clockwise, therefore cannot do to increase the adjustment in gap, melt canal, still remain on " 0 " position.Done after corresponding block ring adjustment, the film that the 2nd test obtains improves significantly on uniform film thickness degree, and its relative standard deviation is reduced to 10.5%.Inventor is by the test comparison of doing to domestic inflation film manufacturing machine blown film product.Such blown film uniform film thickness degree has been in domestic good level.According to the thickness test value of the 2nd test, before the 3rd test, the gap, melt canal of the each segmentation of block ring is done to similar adjustment again, the relative standard deviation of result blown film product is further down to 3.8%, reaches the inhomogeneity higher level of thickness of international blown film product.The screw position that it should be noted that the 3rd test in table 1 is accumulated value, rather than the adjusted value of the 3rd time.
table 1the test block ring adjustment of propylene and ethylene block copolymer blown film and result
embodiment 4
The present embodiment is prepared density polyethylene film with high by the film-blowing die head described in embodiment 1, and the parameter of wherein said film-blowing die head and the inflation film manufacturing machine being used in conjunction with and miscellaneous equipment is with embodiment 3.
Described raw material is high density polyethylene (HDPE), FORMOS PLASTICS CORP. USA, HDPE-5326, density 0.96 g/cm
3, melt flow rate (MFR) 0.35 g/10min.
Processing aid: PPA, ARKEMA KynarFlex 5300,500 ppm, add with the form of 5% prefabricated master batch.
Temperature control: 150 ℃ of extruder feeding sections; Two sections are 180 ℃ subsequently; 180 ℃ of Melt Pump; 180 ℃ of die heads.
The method of adjustment of other fabrication process condition and block ring segmentation is identical with embodiment 2.
Table 2 has gathered experimental result, and experiment shows, when blown film material is from polypropylene changes high density polyethylene (HDPE) into, need do larger adjustment to gap, block ring melt canal, but can on same die head, obtain gratifying result.
table 2the test block ring adjustment of high density polyethylene (HDPE) blown film and result
In the present invention, described film-blowing die head annular die main body, ring-type die orifice and core rod can adopt cast iron or steel, and for example No. 45 steel etc. are made; Because the die lip gap between core rod and ring-type die orifice is for spraying the plastic melt of hot melt, easily suffer heat and chemical erosion, and abrasion, thereby can form erosion resistant and smooth coating on the inner surface of described core rod outer surface and ring-type die orifice, the thickness of described coating is generally 0.05 ~ 1.0 mm; As preferably, the thickness of described coating is 0.2 ~ 0.5mm.Described coating is passed through air plasma spraying composite powder, and forms through Overheating Treatment; Described composite powder comprises the Ni of the component of following percentage by weight: 13.2 ~ 15.5wt%, the Al of 8.2 ~ 10.0wt%, the Cr of 3.2 ~ 5.8wt%, the Mn of 2.1 ~ 2.8wt%, the Mo of 0.50 ~ 0.75wt%, the Si of 2.1 ~ 2.8wt%, the B of 0.5 ~ 0.8wt%, the C of 0.55 ~ 0.75wt%, and the Fe of surplus; Described heat treatment temperature is 820 ~ 880 ℃, and heat treatment time is 60 ~ 180 min.The hardness HRC of described coating can reach 60 ~ 63, can reach 0.15 ~ 0.32 from the coefficient of friction of normal temperature to 300 ℃.
embodiment 5
Take the coating that forms 0.2mm on the inner surface of the core rod outer surface described and ring-type die orifice as example, described core rod and ring-type die orifice adopt No. 45 steel below, and described coating is by air plasma spraying composite powder, and form through Overheating Treatment.Wherein, the technological parameter of described atmosphere plasma spraying plating is as follows: electric current: 500 ~ 550 A, voltage: 40 ~ 45 V, powder feeding gas flow: 6.0 ~ 7.5 L/min, powder feeding gas flow pressure: 0.45 ~ 0.50 MPa, spray distance 50 ~ 80 mm, spray angle 70 ~ 90
o; Heat treatment temperature is 850 ℃, and heat treatment time is 150min.The average grain diameter of described composite powder is 10 μ m, and its composition is as shown in table 3:
the composition (surplus is Fe) of table 3 composite powder, unit is wt%
| Sample | Ni | Al | Cr | Mn | Mo | Si | B | C |
| 1 | 13.2 | 10.0 | 5.8 | 2.1 | 0.75 | 2.8 | 0.50 | 0.75 |
| 2 | 15.5 | 8.2 | 3.2 | 2.8 | 0.50 | 2.1 | 0.80 | 0.55 |
| 3 | 14.3 | 9.0 | 4.8 | 2.5 | 0.60 | 2.5 | 0.75 | 0.60 |
| 4 | 14.8 | 8.8 | 5.0 | 2.4 | 0.55 | 2.4 | 0.65 | 0.65 |
| S1 | 23.7 | — | 3.2 | 2.8 | 0.50 | 2.1 | 0.80 | 0.55 |
| S2 | 14.3 | 9.0 | 4.8 | 2.5 | — | 2.5 | 0.75 | 0.60 |
| S3 | 23.7 | — | 3.2 | 2.8 | — | 2.1 | 0.80 | 0.55 |
The sample 1-4 preparing and S1-S3(S1-S3 are as a comparison) hardness and coefficient of friction as shown in table 4.
Table 4
| | Hardness | 20 ℃ of coefficient of frictions | 100 ℃ of coefficient of frictions | 200 ℃ of coefficient of frictions | 300 ℃ of coefficient of frictions | |
| 1 | 61.2 | 0.31 | 0.28 | 0.21 | 0.16 | |
| 2 | 61.5 | 0.30 | 0.27 | 0.20 | 0.15 | |
| 3 | 61.6 | 0.28 | 0.27 | 0.22 | 0.16 | |
| 4 | 61.3 | 0.29 | 0.28 | 0.20 | 0.16 | |
| S1 | 63.8 | 0.41 | 0.37 | 0.35 | 0.32 | |
| S2 | 61.6 | 0.33 | 0.30 | 0.27 | 0.25 | |
| S3 | 63.5 | 0.40 | 0.36 | 0.34 | 0.30 |
For the ordinary skill in the art; specific embodiment is just exemplarily described the present invention by reference to the accompanying drawings; obviously specific implementation of the present invention is not subject to the restrictions described above; as long as adopted the improvement of the various unsubstantialities that method of the present invention design and technical scheme carry out; or without improving, design of the present invention and technical scheme are directly applied to other occasion, all within protection scope of the present invention.
Claims (10)
1. one kind is improved the film-blowing die head of the horizontal film thickness uniformity of product, it is characterized in that: comprise a point ebb interval, die lip gap and block ring, and die lip gap axis is radially shunted and passed through to plastic melt to outflow from described point of ebb interval, and described block ring is for regulating the flow that enters the plastic melt in die lip gap from described point of ebb interval.
2. the film-blowing die head of the horizontal film thickness uniformity of raising product according to claim 1, is characterized in that: described film-blowing die head also comprises die body, die orifice, core rod; Described mould core rod is arranged in described die orifice, and and described ring-type die orifice between be formed with die lip gap; And described die body is arranged on described core rod below, and between the lower surface of described core rod and the upper surface of described die body, be formed with a point ebb interval; Die lip gap axis is radially shunted and passed through to plastic melt to outflow from described point of ebb interval, and described block ring can regulate the flow that enters the plastic melt in die lip gap from described point of ebb interval by adjusting device.
3. the film-blowing die head of the horizontal film thickness uniformity of raising product according to claim 1 and 2, is characterized in that: described plastic melt is from central feeding, periphery discharging.
4. the film-blowing die head of the horizontal film thickness uniformity of raising product according to claim 3, is characterized in that: described film-blowing die head comprises annular die main body, ring-type die orifice and the core rod of coaxial setting; Described core rod is arranged in described ring-type die orifice, and and described ring-type die orifice between be formed with die lip gap; And described die body is arranged on described ring-type die orifice and core rod below, between the lower surface of described core rod and the upper surface of described die body, be formed with a point ebb interval; On the upper surface of described die body, be provided with two or several helicla flutes, and along described in spiral fluted direction of rotation, helicla flute becomes greatly gradually from the radial distance in the described die body upper surface center of circle, and groove depth shoals gradually; To make plastic melt from described spiral fluted origin-to-destination, flowing of plastic melt is that main to gradually become uniform Radial Flow be main from flowing in groove.
5. the film-blowing die head of the horizontal film thickness uniformity of raising product according to claim 4, it is characterized in that: along with die body upper surface becomes greatly gradually to the radial distance in the center of circle, the gap between described die body upper surface and described core rod lower surface becomes large gradually.
6. the film-blowing die head of the horizontal film thickness uniformity of raising product according to claim 5, it is characterized in that: corresponding to the intersection in described die lip gap and described gap, on the upper surface of described die orifice main body, be provided with block ring, on circumferencial direction on described block ring, the certain distance in interval is provided with slack adjuster, the gap length that described slack adjuster can regulate described block ring to allow plastic melt to pass through.
7. the film-blowing die head of the horizontal film thickness uniformity of raising product according to claim 4, it is characterized in that: described film-blowing die head also comprises melt feeder, described melt feeder is arranged on the center of described die body, and the top of described melt feeder extends to certain distance in described core rod, be fixed by threaded engagement, and the bottom of described melt feeder offers melt charging aperture, described melt charging aperture provides melt to described helicla flute by drainage channel; The number of described drainage channel equates with described spiral fluted number, and the upper end of described drainage channel is connected to described melt charging aperture, and the end of described drainage channel is connected to described spiral fluted starting point.
8. the film-blowing die head of the horizontal film thickness uniformity of raising product according to claim 1, is characterized in that: described plastic melt is from side direction charging, center discharging.
9. the film-blowing die head of the horizontal film thickness uniformity of raising product according to claim 8, is characterized in that: described film-blowing die head comprises annular die main body, ring-type die orifice and core rod; Described core rod is arranged on the center of described ring-type die orifice and annular die main body, and and described ring-type die orifice between be formed with die lip gap; And described die body is arranged on the below of described ring-type die orifice, between the lower surface of described ring-type die orifice and the upper surface of described die body, be formed with a point ebb interval, and along with die body upper surface diminishes gradually to the radial distance in the center of circle, the gap between described die body upper surface and described ring-type die orifice lower surface becomes large gradually; On the upper surface of described die body, be provided with two or several helicla flutes, and along described spiral fluted direction of rotation, helicla flute diminishes gradually from the radial distance in the described die body lower surface center of circle, groove depth shoals gradually; To make plastic melt from described spiral fluted origin-to-destination, flowing of plastic melt is that main to gradually become uniform Radial Flow be main from flowing in groove.
10. the film-blowing die head of the horizontal film thickness uniformity of raising product according to claim 9, it is characterized in that: corresponding to the intersection of described die lip gap and described point of ebb interval, on the upper surface of described die orifice main body, be provided with block ring, on circumferencial direction on described block ring, the certain distance in interval is provided with slack adjuster, the size of dividing ebb interval that described slack adjuster can regulate described block ring to allow plastic melt to pass through.
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| CN201410125329.0A CN103862666B (en) | 2014-03-31 | 2014-03-31 | Improve the film-blowing die head of the horizontal film thickness uniformity of product |
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| CN201410125329.0A CN103862666B (en) | 2014-03-31 | 2014-03-31 | Improve the film-blowing die head of the horizontal film thickness uniformity of product |
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| CN103862666B CN103862666B (en) | 2016-02-10 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110293666A (en) * | 2019-06-14 | 2019-10-01 | 山东通佳智能装备有限公司 | A kind of blow molding machine head shunting disk |
| CN111452341A (en) * | 2020-04-09 | 2020-07-28 | 陈倩倩 | Inflation film manufacturing machine is used in plastics production |
| CN117124579A (en) * | 2023-09-07 | 2023-11-28 | 徐州赫博包装有限公司 | Film production blow molding machine for ultra-pure PE packaging bag |
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| US5116211A (en) * | 1989-03-30 | 1992-05-26 | Tomi Machinery Manufacturing Co., Ltd. | Apparatus for controlling thickness of film formed by melt extrusion |
| CN201195392Y (en) * | 2008-03-28 | 2009-02-18 | 马镇鑫 | Automatic regulating device for vent gap of plastic film blowing machine mould head |
| CN101767449A (en) * | 2010-01-20 | 2010-07-07 | 义乌市望江塑料厂 | Multi-layer co-extrusion film-blowing die head capable of automatically controlling and stabilizing diameter of female film |
| CN203792708U (en) * | 2014-03-31 | 2014-08-27 | 浙江博尔塑胶有限公司 | Film blowing die head for improving lateral film thickness uniformity of product |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US5116211A (en) * | 1989-03-30 | 1992-05-26 | Tomi Machinery Manufacturing Co., Ltd. | Apparatus for controlling thickness of film formed by melt extrusion |
| CN201195392Y (en) * | 2008-03-28 | 2009-02-18 | 马镇鑫 | Automatic regulating device for vent gap of plastic film blowing machine mould head |
| CN101767449A (en) * | 2010-01-20 | 2010-07-07 | 义乌市望江塑料厂 | Multi-layer co-extrusion film-blowing die head capable of automatically controlling and stabilizing diameter of female film |
| CN203792708U (en) * | 2014-03-31 | 2014-08-27 | 浙江博尔塑胶有限公司 | Film blowing die head for improving lateral film thickness uniformity of product |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110293666A (en) * | 2019-06-14 | 2019-10-01 | 山东通佳智能装备有限公司 | A kind of blow molding machine head shunting disk |
| CN111452341A (en) * | 2020-04-09 | 2020-07-28 | 陈倩倩 | Inflation film manufacturing machine is used in plastics production |
| CN117124579A (en) * | 2023-09-07 | 2023-11-28 | 徐州赫博包装有限公司 | Film production blow molding machine for ultra-pure PE packaging bag |
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| CN103862666B (en) | 2016-02-10 |
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