CN103862666B - Improve the film-blowing die head of the horizontal film thickness uniformity of product - Google Patents
Improve the film-blowing die head of the horizontal film thickness uniformity of product Download PDFInfo
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- CN103862666B CN103862666B CN201410125329.0A CN201410125329A CN103862666B CN 103862666 B CN103862666 B CN 103862666B CN 201410125329 A CN201410125329 A CN 201410125329A CN 103862666 B CN103862666 B CN 103862666B
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- 238000010096 film blowing Methods 0.000 title claims abstract description 46
- 239000004033 plastic Substances 0.000 claims abstract description 39
- 229920003023 plastic Polymers 0.000 claims abstract description 39
- 238000007599 discharging Methods 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 abstract description 6
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- 238000007750 plasma spraying Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
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- QQONPFPTGQHPMA-UHFFFAOYSA-N Propene Chemical group CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
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- 230000003628 erosive effect Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
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- 239000005977 Ethylene Substances 0.000 description 1
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- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The present invention relates to a kind of film-blowing die head improving the horizontal film thickness uniformity of product, belong to the technical field of plastic processing, described film-blowing die head comprises a point ebb interval, die lip gap and block ring, and plastic melt radially to be shunted and through die lip gap axis to outflow from described point of ebb interval, and described block ring is for regulating the flow entering the plastic melt in die lip gap from described point of ebb interval.The present invention by introducing block ring between plane shunting section and die lip section, and can control the flow at die lip circumferentially each position flexibly by the degree of depth regulating each position of block ring to embed plastic melt; And substantially do not affect the flow at die lip circumferentially other position, thus solve the uneven problem of the horizontal thickness of blown film film product.
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, but the thickness uniformity how improving film product is but a technical barrier always.Compared with tape-casting technique, although film-blowing process equipment investment is supported, the feed back produced 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, longitudinally flow out from die lip gap, make film product through supercooling.Die lip configuration die lip lash adjusting device, can according to the measured value of the horizontal thickness distribution of product, and be adjusted accordingly the die lip gap at each position, therefore the horizontal thickness uniformity of product is good.
In film-blowing process, die lip is made up of the gap between the rigid external collar of columned plug and cylindrical shape or flexible outer ring.Although outer ring is furnished with the device in adjustment die lip gap, such as along set screw or the regulating rod of the outer wall circumference setting of outer ring, plastic film blowing machine disclosed in CN201195392Y, CN1939700A is die head especially used, but applicant finds to do the adjustment of die lip gap in die lip any one position circumferentially, all inevitably the die lip gap of other position is impacted, be especially separated by the position of 180 °.So for existing blown film die, adjustment die lip gap is very limited to the effect improving the horizontal thickness uniformity of product, cannot effectively overcome or compensating mold machining precision error.And more seriously, applicant also finds in film-blowing process, the inhomogeneities of die lip each position flow, can be exaggerated along with the increase of blow-up ratio and draw ratio.Because the position that melt flow is little is subject to propelling the price of more greatly because film embryo is thinner, the position that melt flow is large is subject to less propelling the price of because film embryo is thicker.Therefore, for film-blowing process, domestic inflation film manufacturing machine is also difficult in the thickness relative standard deviation laterally reaching 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 ensure the apparent smooth of film product rolling, often through rotating die head or rotary winding device, the thickness offset of film product is assigned to equably each position of Scroll.But from the angle that product uses, rotating die head or rotation rolling fundamentally cannot solve the problem of blow molded article transverse gage lack of homogeneity.
In addition, in order to solve the uniform film thickness sex chromosome mosaicism of blown film products, market additionally provides the technical scheme using intelligent vane, its effect is the thickness measuring value according to film product, the blowing amount at each position of intelligentized control method vane thus control the local blow-up ratio at 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, improve 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 improving the horizontal film thickness uniformity of product.The present inventor finds by introducing block ring between plane shunting section and die lip section, embeds by regulating each position of block ring the flow that the degree of depth of plastic melt can control die lip circumferentially each position flexibly; And substantially do not affect the flow at die lip circumferentially other position, thus solve the uneven problem of the horizontal thickness of film product.
Realize goal of the invention in order to the technical problem that solves described in invention, present invention employs 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 plastic melt radially to be shunted and through die lip gap axis to outflow from described point of ebb interval, and described block ring is for regulating the flow entering 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 be formed with die lip gap between described ring-type die orifice; And described die body is arranged on below described core rod, and be formed with a point ebb interval between the upper surface of the lower surface of described core rod and described die body; Plastic melt radially to be shunted and through die lip gap axis to outflow from described point of ebb interval, and described block ring can regulate the flow entering the plastic melt in die lip gap from described point of ebb interval by adjusting device.
Selectively, described plastic melt from central feeding, periphery discharging.
As preferably, described film-blowing die head comprises coaxial the annular die main body, ring-type die orifice and the core rod that arrange; Described core rod is arranged in described ring-type die orifice, and and be formed with die lip gap between described ring-type die orifice; And described die body is arranged on below described ring-type die orifice and core rod, between the lower surface of described core rod and the upper surface of described die body, be formed with a point ebb interval; The upper surface of described die body is provided with two or several helicla flutes, and along described spiral fluted direction of rotation, helicla flute becomes large 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, it is that main to gradually become uniform Radial Flow be main that the flowing of plastic melt is flowed in groove.
Wherein, along with die body upper surface becomes large 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, the upper surface of described die body is provided with block ring, being circumferentially spaced a distance on described block ring is provided with slack adjuster, the shunting gap length that described slack adjuster can regulate described block ring permission 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 is equal 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 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 be formed with die lip gap between described ring-type die orifice; And described die body is arranged on the below of described ring-type die orifice, a point ebb interval is formed between the lower surface of described ring-type die orifice and the upper surface of described die body, and diminish gradually along with the radial distance of die body upper surface to the center of circle, the gap between described die body upper surface and described ring-type die orifice lower surface becomes large gradually; The upper surface of described die body is 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, and groove depth shoals gradually; To make plastic melt from described spiral fluted origin-to-destination, it is that main to gradually become uniform Radial Flow be main that the flowing of plastic melt is flowed in groove.
Wherein, corresponding to the intersection of described die lip gap and described point of ebb interval, the upper surface of described die body is provided with block ring, being circumferentially spaced a distance on described block ring is provided with slack adjuster, the size of point ebb interval that described slack adjuster can regulate described block ring to allow plastic melt to pass through.Described slack adjuster such as can for bevel gear, worm and gear, surface push-rod or other can realize the structure of described regulatory function.Plastic melt is by entering die lip gap after this choked flow section.And film-blowing die head that is two-layer or multilayer complex films can be formed by two or more die body superposition.With combination die head extruded blown composite membrane of the present invention, not only can control the uniformity of composite membrane gross thickness, the thickness uniformity of each individual layer can be controlled.
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 is found 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 do moving radially of melt flows vertical direction.And any point is done radial adjustment and all inevitably can be had influence on other positions on annulus, thus the independence that cannot realize each position regulates die lip gap, other region, especially the melt flow in region of 180 ° is separated by due to larger variation can be subject to, the independence adjustment at each position cannot be realized, thus the problem of the thick uniformity of the horizontal mould of product cannot be solved, cause horizontal film thickness difference to be difficult to reach less than 10%.Through constantly attempting and introducing block ring by dividing in plane between ebb interval and die lip gap after design, by the flow regulating the degree of depth of block ring each position embedding plastic melt can control die lip circumferentially each position flexibly; And substantially do not affect the flow at other position, thus solve the uneven 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 improve single die head.Different plastic raw materials has different flow behaviors, all may there is the change 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, thus impacts the transverse gage uniform distribution of film product.But the block ring device utilizing the present invention to introduce regulates the gap of described die body lower surface and core rod upper surface, can carry out balancing again to the inhomogeneities that shunting section flows out, thus improve the versatility of single die head.
(3) film-blowing die head that is two-layer or multilayer complex films can be formed by two or more planar disk superposition.May 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 be in Fig. 1 along A-A direction sectional structure schematic diagram upwards.
Fig. 3 is the shaft section structural representation of film-blowing die head described in embodiment 2.
Detailed description of the invention
Below with reference to specific embodiment, the structure of the film-blowing die head of the horizontal film thickness uniformity of raising product of the present invention, material and application are further elaborated, have more complete, accurate and deep understanding to help those skilled in the art to inventive concept of the present invention, technical scheme; It is to be understood that be all exemplary to the description of structure and material in a particular embodiment, and do not mean limiting the scope of the invention, interest field of the present invention is as the criterion with the claim limited.
embodiment 1
As shown in accompanying drawing 1-2, the film-blowing die head of the horizontal film thickness uniformity of the raising product described in the present embodiment, it comprises coaxial the annular die main body 10, ring-type die orifice 20, core rod 30 and the melt feeder 40 that arrange; Described core rod 30 is arranged in described ring-type die orifice 20, and and be formed with die lip gap 21 between described ring-type die orifice, and described die lip gap 21 comprises the vertical section 22 axially extending to described core rod bottom surface; And described die body 10 is arranged on below described ring-type die orifice 20 and core rod 30, and by fixture 15 described die body 10 located and be 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; The upper surface of described die body 10 is 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 becoming large gradually along with the radial distance in the die body lower surface center of circle, 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 certain distance in 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 gas entry outlet passage 31, and described melt feeder is provided with the inlet channel 43 that can be communicated to described core rod gas entry outlet passage; And corresponding to the intersection in described die lip gap and described gap, the upper surface of described die body is also provided with block ring 13, described block ring 13 is circumferentially provided with a gap adjustment screw rod 14 at interval of 10 degree, the size of point 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 the breeze way 23 axially extending to described vertical section 22 from described core rod upper surface; The number of described drainage channel is equal with described spiral fluted number, be 4, and described drainage channel is evenly arranged 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 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 the center of described ring-type die orifice 60 and annular die main body 50, and and be formed with die lip gap 61 between described ring-type die orifice 60; And described die body 50 is arranged on the below of described ring-type die orifice 60, point ebb interval 51 is formed between the lower surface of described ring-type die orifice 60 and the upper surface of described die body 50, and diminish gradually along with the radial distance of die body upper surface to the center of circle, point ebb interval 51 between described die body 50 upper surface and described ring-type die orifice lower surface becomes large gradually; The upper surface of described die body 50 is 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, and groove depth shoals gradually; To make plastic melt from described spiral fluted origin-to-destination, it is that main to gradually become uniform Radial Flow be main that the flowing of plastic melt is flowed in groove.Corresponding to the intersection of described die lip gap and described point of ebb interval, the upper surface of described die body is provided with block ring 80, being circumferentially spaced a distance on described block ring 80 is provided with slack adjuster 81, the size of point ebb interval that described slack adjuster 81 can regulate described block ring to allow plastic melt to pass through.Described slack adjuster such as can for bevel gear, worm and gear, surface push-rod or other can realize the structure of described regulatory function.Plastic melt is by entering die lip gap after this choked flow section.And film-blowing die head that is two-layer or multilayer complex films can be formed by two or more die body superposition.With combination die head extruded blown composite membrane of the present invention, not only can control the uniformity of composite membrane gross thickness, the thickness uniformity of each individual layer can be controlled.
embodiment 3
The present embodiment prepares polypropylene ethylene Block Copolymer Thin Film by the film-blowing die head described in embodiment 1, wherein said film-blowing die head and with the use of inflation film manufacturing machine and the parameter of miscellaneous equipment (such as Melt Pump, cooling vane) as follows:
Shunting section kind: snail, outer processing customization
Helicla flute number: 4
Helicla flute starting point radius: 33mm
Helicla flute terminal radius: 73mm
The helicla flute starting point degree of depth: 12.4mm
Helicla flute starting point outer end gap: 0.6mm
Helicla flute terminal outer end gap: 1.6mm
Helicla flute width: 6.0mm
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: 1.6mm
Block ring width: 12mm
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 diameter: 156mm
Die lip gap: 1.6mm
Die orifice flat segments length: 50mm
Extruder: Ф 45mm singe screw, 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: 30mm
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) petrochemical industry Co., Ltd PP66M10T, density 0.905g/cm
3, melt flow rate (MFR) 3.5g/10min.
Temperature controls: extruder feeding section 160 DEG C; Two sections are 190 DEG C subsequently; Melt Pump 190 DEG C; Die head 190 DEG C.
Speeds control: Melt Pump rotating speed 30rpm, during adjustment extruder rotating speed, Melt Pump inlet pressure remains on about 1.5Mpa.
Rolling fabric width: 420mm
Hauling speed: adjustment hauling speed makes film product thickness close to 22 microns.
When the test of work the 1st blown film, tightened clockwise by the adjustment screw of every section of block ring, and hypothesis screw position is now 0 ° is laterally cut short by film product, 23.33mm of being often separated by does a mark, makes it the center of each block ring segmentation corresponding.Thickness test value is summarised in table 1.When average film thickness 21.7 microns, relative standard deviation is 16.3%.Minimum of a value 14 microns and maximum 27 microns is there is respectively at 210 ° and 320 ° of positions.It is 21 microns at the thickness of 210 ° of opposite side (30 °).Subaverage; It is 23 microns at the thickness of 320 ° of opposite side (140 °), higher than mean value.As can be seen here, position, die orifice outer ring is adjusted very limited to the effect of reduction film thickness error.In the 2nd test, position, die orifice outer ring keeps motionless, and do higher than the block ring segmentation of mean value the adjustment reducing gap, melt canal to thickness, the set screw anglec of rotation of its correspondence is calculated as follows:
Adjustment angle=(average film thickness/corresponding points thickness-1) × 250 ° (rounding numerical value)
Adjusted value listed by table 1, and "-" expression is rotated counterclockwise.To sub-average block ring segmentation, because the set screw of correspondence is tightened clockwise, therefore the adjustment increasing gap, melt canal cannot be done, still remain on " 0 " position.After having done corresponding block ring adjustment, test the film obtained the 2nd time and improve significantly on film thickness uniformity, its relative standard deviation has been reduced to 10.5%.Inventor is by the test comparison done to domestic inflation film manufacturing machine blown film products.Such blown film film thickness uniformity has been in domestic good level.According to the thickness test value of the 2nd test, before the 3rd test, similar adjustment is done again to the gap, melt canal of each segmentation of block ring, the relative standard deviation of result blown film products is down to 3.8% further, reaches the higher level of the thickness uniformity of international blown film products.It should be noted that the screw position that in table 1, the 3rd time is tested is accumulated value, instead of the adjusted value of the 3rd time.
table 1propylene ethylene block copolymer blown film test block ring adjustment and result
embodiment 4
The present embodiment prepares density polyethylene film with high by the film-blowing die head described in embodiment 1, wherein said film-blowing die head and with the use of inflation film manufacturing machine and the parameter of miscellaneous equipment with embodiment 3.
Described raw material is high density polyethylene (HDPE), FORMOSPLASTICSCORP.USA, HDPE-5326, density 0.96g/cm
3, melt flow rate (MFR) 0.35g/10min.
Processing aid: PPA, ARKEMAKynarFlex5300,500ppm, adds with the form of 5% prefabricated master batch.
Temperature controls: extruder feeding section 150 DEG C; Two sections are 180 DEG C subsequently; Melt Pump 180 DEG C; Die head 180 DEG C.
Other fabrication process condition is identical with embodiment 2 with the method for adjustment of block ring segmentation.
Table 2 summarizes experimental result, and experiment shows after blown film material changes high density polyethylene (HDPE) into from polypropylene, need do larger adjustment, but can obtain gratifying result on same die head to gap, block ring melt canal.
table 2high density polyethylene (HDPE) blown film test block ring adjustment 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 such as 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, thus 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 ~ 1.0mm; As preferably, the thickness of described coating is 0.2 ~ 0.5mm.Described coating by air plasma spraying composite powder, and is formed through Overheating Treatment; Described composite powder comprises the component of following percentage by weight: the Cr of the Al of the Ni of 13.2 ~ 15.5wt%, 8.2 ~ 10.0wt%, 3.2 ~ 5.8wt%, the Si of the Mo of the Mn of 2.1 ~ 2.8wt%, 0.50 ~ 0.75wt%, 2.1 ~ 2.8wt%, the C of the B of 0.5 ~ 0.8wt%, 0.55 ~ 0.75wt%, and the Fe of surplus; Described heat treatment temperature is 820 ~ 880 DEG C, and heat treatment time is 60 ~ 180min.The hardness HRC of described coating can reach 60 ~ 63, can reach 0.15 ~ 0.32 from normal temperature to the coefficient of friction of 300 DEG C.
embodiment 5
Below to form the coating of 0.2mm for example on the inner surface of described core rod outer surface and ring-type die orifice, described core rod and ring-type die orifice adopt No. 45 steel, and described coating by air plasma spraying composite powder, and is formed through Overheating Treatment.Wherein, the technological parameter of described atmosphere plasma spraying plating is as follows: electric current: 500 ~ 550A, voltage: 40 ~ 45V, powder feeding gas flow: 6.0 ~ 7.5L/min, powder feeding gas flow pressure: 0.45 ~ 0.50MPa, spray distance 50 ~ 80mm, spray angle 70 ~ 90
o; Heat treatment temperature is 850 DEG C, and heat treatment time is 150min.The average grain diameter of described composite powder is 10 μm, 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 |
Sample 1-4 and S1-S3(S1-S3 prepared is as comparing) hardness and coefficient of friction as shown in table 4.
Table 4
| Sample | Hardness | 20 DEG C of coefficient of frictions | 100 DEG C of coefficient of frictions | 200 DEG C of coefficient of frictions | 300 DEG C 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 by reference to the accompanying drawings to invention has been exemplary description; obvious specific implementation of the present invention is not subject to the restrictions described above; as long as have employed the improvement of the various unsubstantialities that method of the present invention is conceived and technical scheme is carried out; or design of the present invention and technical scheme directly applied to other occasion, all within protection scope of the present invention without to improve.
Claims (9)
1. improve a film-blowing die head for the horizontal film thickness uniformity of product, it is characterized in that: comprise die body, point ebb interval, die lip gap and block ring, plastic melt radially to be shunted and through die lip gap axis to outflow from described point of ebb interval; Corresponding to the intersection of described die lip gap and described point of ebb interval, the upper surface of described die body arranges described block ring, being circumferentially spaced a distance on described block ring is provided with slack adjuster, the gap length that described slack adjuster can regulate described block ring permission plastic melt to pass through.
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 orifice and core rod; Described core rod is arranged in described die orifice, and and form die lip gap between described die orifice; And described die body is arranged on below described core rod, and between the upper surface of the lower surface of described core rod and described die body, form a point ebb interval.
3. 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 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 coaxial the annular die main body, ring-type die orifice and the core rod that arrange; Described core rod is arranged in described ring-type die orifice, and and form die lip gap between described ring-type die orifice; And described die body is arranged on below described ring-type die orifice and core rod, between the lower surface of described core rod and the upper surface of described die body, be formed with a point ebb interval; The upper surface of described die body is provided with several helicla flutes, and along described spiral fluted direction of rotation, helicla flute becomes large 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, it is that main to gradually become uniform Radial Flow be main that the flowing of plastic melt is flowed 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 large 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 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 is equal 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.
7. 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 from side direction charging, center discharging.
8. the film-blowing die head of the horizontal film thickness uniformity of raising product according to claim 7, 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 be formed with die lip gap between described ring-type die orifice; And described die body is arranged on the below of described ring-type die orifice, a point ebb interval is formed between the lower surface of described ring-type die orifice and the upper surface of described die body, and diminish gradually along with the radial distance of die body upper surface to the center of circle, the gap between described die body upper surface and described ring-type die orifice lower surface becomes large gradually; The upper surface of described die body is provided with 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, and groove depth shoals gradually; To make plastic melt from described spiral fluted origin-to-destination, it is that main to gradually become uniform Radial Flow be main that the flowing of plastic melt is flowed in groove.
9. the film-blowing die head of the horizontal film thickness uniformity of raising product according to claim 8, it is characterized in that: corresponding to the intersection of described die lip gap and described point of ebb interval, the upper surface of described die body is provided with block ring, being circumferentially spaced a distance on described block ring is provided with slack adjuster, the size of point ebb interval that described slack adjuster can regulate described block ring to allow plastic melt to pass through.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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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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| Application Number | Priority Date | Filing Date | Title |
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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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| CN103862666A CN103862666A (en) | 2014-06-18 |
| CN103862666B true CN103862666B (en) | 2016-02-10 |
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| 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 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
2014
- 2014-03-31 CN CN201410125329.0A patent/CN103862666B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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| CN103862666A (en) | 2014-06-18 |
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Effective date of registration: 20220706 Address after: 325608 shuikeng village, Hongqiao Town, Leqing City, Wenzhou City, Zhejiang Province (within Zhejiang wocheng Meitian Automobile Industry Co., Ltd.) Patentee after: Yueqing bor Plastic Co.,Ltd. Address before: 325000 Wenzhou City, Zhejiang Province No. 1, building 10, No. 588, Binhai Park 12th Road, Wenzhou Economic and Technological Development Zone, Zhejiang Province Patentee before: ZHEJIANG BOER PLASTIC Co.,Ltd. |
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