CN105252752B - A kind of overfeeding formula film drawing process - Google Patents
A kind of overfeeding formula film drawing process Download PDFInfo
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- CN105252752B CN105252752B CN201510734334.6A CN201510734334A CN105252752B CN 105252752 B CN105252752 B CN 105252752B CN 201510734334 A CN201510734334 A CN 201510734334A CN 105252752 B CN105252752 B CN 105252752B
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Abstract
The invention discloses a kind of overfeeding formula film drawing process, it is more than the chain folder length of stretching-machine by the film length of fixture clamping in film drawing process, amount of redundancy is formed between film length and chain folder length during folder film feeding stretching, amount of redundancy is piled up in the gap between fixture and forms fold.The present invention is using overfeeding formula film stretching production technology, in the gripping section not build-up film of fixture, only accumulated between front and rear fixture at gap, when vertical contracting occurs for cross directional stretch, in fixture holding position longitudinal contraction does not occur for diaphragm edge, and vertical contracting, which occurs, by inner film makes the reduction of longitudinal contraction rate.And edge crevice place leaves amount of redundancy (fold), edge is cut off after horizontal pull-out mouth, is not the part of product.The present invention uses overfeeding formula film drawing process, and stepless changing longitudinal contraction rate can be achieved, the longitudinal contraction rate of the film after horizontal drawing is controlled in controlled range.
Description
Technical field
The present invention relates to a kind of drawing process, more particularly to a kind of overfeeding formula film drawing process.
Background technology
Film drawing process can be divided into gradually stretching and synchro-draw according to stretching order：Gradually stretching is exactly that plastics are thin
Thickness piece first carries out longitudinal stretching, then carries out cross directional stretch, and biaxial tension is divided into two steps and gradually carried out, naturally it is also possible to first horizontal drawing
Indulge and draw again；Carry out longitudinal stretching while synchro-draw is cross directional stretch, be film both direction in length and breadth the advantages of synchro-draw
Similar nature.And the both direction performance difference gradually stretched is larger.
Film drawing process can be divided into planar stretch and bubble pipe stretching by stretching mode point：Planar chip is extruded by flat die
Material, then carry out being stretched as horizontal drawing stretching；Inflation is carried out again by annular die head extrusion tubular sheet to be stretched as steeping tube method blown film, it is most of
Agricultural film, plastic shopping bag using blowing produce.
For the conceptual description of horizontal drawing film longitudinal contraction rate：1st, why film is stretched：Film production is most
Using high polymer material, generally the segment of high polymer material is bending, can be straightened in the case of stress, so
The general less film of unstretched or extensibility can be easily elongated when in use.Most typical such as preservative film, it is exactly
The characteristic that it is easily elongated be make use of to coat packed article.But some products need not to be elongated, it is desirable to have less stretch
Long rate, such as strap, it is desirable to which there is larger tensile strength longitudinal direction, therefore has carried out longitudinal simple tension；Some products need vertical
Horizontal stroke is two-way stronger tensile strength, then needs to carry out biaxial tension.
The problem of shrinkage factor increase be present in stretched film：The trend that high polymer material has disorientation after stretching is orientated is deposited
, here it is shrink the main reason for.The film product shunk to needs then takes full advantage of this characteristic, as cable connector is received
Contracting film, beverage bottle mark shrink film etc..Conference is crossed to the film product shrinkage factor that need not be shunk and brings problem, therefore to be shifted to an earlier date
Eliminate the problem of shrinkage factor is excessive.The main method of shrinkage factor is eliminated to diaphragm to be made to reduce the tensile force of film at high operating temperatures
Its fully pre- retraction.
Traditional horizontal drawing film mode of production：
1st, total production procedure：Be formulated batch mixing → extruded machine and die head extrude sheet → sheet in chilling roller cooling and shaping →
It is vertical to draw pre- hot-stretch → transverse direction preheating, stretching, sizing → post processing cutting edge, the big film roll of sided corona treatment → winding (subsequently secondary to add
Work is omitted).
2nd, cross directional stretch flow：Diaphragm level height is scheduled on and horizontal drawing jaws identical height, horizontal stroke by horizontal drawing guide roll
Draw clip (fixture) to clamp diaphragm edge on diaphragm both sides to move to horizontal drawing case preheating section, preheated good film enters laterally
Stretch section carries out cross directional stretch (lateral separation of both sides clip gradually increases, and cross directional stretch is carried out to film).
The method that shrinkage factor is reduced to cross directional stretch direction is that film running track width is carried out into constriction, allows film in high temperature
Lower relaxation laterally bounces back because there is the leeway of retraction, and this is easily achieved in form in device structure.But to longitudinal stretching side
Reduction to shrinkage factor with regard to relatively difficult because it is horizontal draw heating retraction be to be carried out under the mode of soaring, and longitudinal contraction be
Carried out on roller, therefore following two subject matters be present：First, the limitation of heating height, temperature is too high to occur film adhesion
Scald scar occurs for roller；Second, vertical membrane piece is coated on what is run on roller, diaphragm tension can not be loose abundant between roller
Retraction, the diaphragm excessive rear film bag that relaxes does not live roller and sliding can occur makes to produce sliding on film to rub wound between roller.
The content of the invention
It is an object of the invention to provide a kind of overfeeding formula film drawing process, can effectively cut down longitudinal contraction rate, solution
Certainly shortcoming existing for prior art.
The present invention adopts the following technical scheme that realization：
A kind of overfeeding formula film drawing process, it is characterised in that the film by fixture clamping in film drawing process is grown
Degree forms redundancy during folder film feeding stretching more than the chain folder length of stretching-machine between film length and chain folder length
Amount, amount of redundancy, which is piled up in the gap between fixture, forms fold, and fold can quantitatively control the vertical of film in process of production
To shrinkage degree.
Further, clamp film in the horizontal drawing porch of production line to move ahead, carry out horizontal preheating, transverse direction successively
Stretching, sizing and cooling technique, opened in horizontal drawing exit fixture, film is departed from fixture and complete cross directional stretch, film continues
Move ahead and enter follow-up equipment, returning to horizontal drawing porch along circular orbit in the on state with the chain folder of thin film separation is ready for
Film work, the above-mentioned technological process of circulating repetition are pressed from both sides next time.
Further, overfeeding mode is that negative pressure of vacuum adsorbs conveying-type or traction to roller mode.
Further, the fixture is Double-station clamp.
The present invention is using overfeeding formula film stretching production technology, in the gripping section not build-up film of fixture, only in front and rear folder
Accumulated between tool at gap, when vertical contracting occurs for cross directional stretch, in fixture holding position longitudinal contraction does not occur for diaphragm edge, by
In film vertical contracting occur make the reduction of longitudinal contraction rate.And edge crevice place leaves amount of redundancy (fold), in horizontal pull-out mouth back
Portion is cut off, and is not the part of product.Stepless changing can be realized using the overfeeding formula film stretching production technology of the present invention
Longitudinal contraction rate, the longitudinal contraction rate of the film after horizontal drawing is set to be controlled in controlled range.
Brief description of the drawings
Fig. 1 is the schematic diagram after film shrunk.
Fig. 2 is the trimming schematic diagram after film shrunk.
Fig. 3 is film stretching schematic diagram.
Fig. 4 is the schematic diagram of active overfeeding two pairs of rollers film feeding.
Embodiment
By the following description to embodiment, it will more contribute to public understanding of the invention, but can't should be by Shen
Given specific embodiment of asking someone is considered as the limitation to technical solution of the present invention, any definition to part or technical characteristic
Be changed and/or make form to overall structure and immaterial conversion is regarded as what technical scheme was limited
Protection domain.
Figure of description description of symbols：Trim lines 1, webbing 2, sheet 3, it is horizontal pull in mouth 4, entrance sprocket wheel 5, outlet sprocket wheel 6,
Film 7, horizontal pull-out mouth 8, active two pairs of rollers 9, fixture 10, active overfeeding two pairs of rollers 11, drive roll 12, pressure roller 13, drive roll 14, pressure roller
15th, film 16, projection 17, active film feeding crawler belt 18, preheating section A, stretch section B, cooling and shaping section C, traction winding D
The production technology of the present embodiment：A kind of overfeeding formula film drawing process, it is characterised in that in film drawing process
It is more than the chain folder length of stretching-machine by the film length of fixture clamping, film length and chain folder length during feeding stretches
Between form amount of redundancy, amount of redundancy is piled up in the gap between fixture and forms fold.In the horizontal drawing porch of production line
Clamp film to move ahead, carry out horizontal preheating, cross directional stretch, sizing and cooling technique successively, due to overfeeding shape at preheating section A
Into projection 17, drawn section B and during cooling and shaping section C, film stretches flattening by fixture 10, and thickness is thinning and surface area becomes greatly,
The major part of projection 17 disappears therewith, and only both ends have still retained fold, and these folds are present in the gap between fixture 10,
Opened in horizontal drawing exit fixture, film is departed from fixture and complete cross directional stretch, trimming device cuts film side, before film continues
Follow-up equipment is advanced into, returning to horizontal drawing porch along circular orbit in the on state with the chain folder of thin film separation is ready for down
Once press from both sides film work, the above-mentioned technological process of circulating repetition.In other embodiments, overfeeding mode is that negative pressure of vacuum adsorbs conveying-type
Or diaphragm absorption is fed clamp mouth part, the speed of conveyer belt is big by traction on the conveyor belt to roller mode using negative pressure of vacuum absorption
In the speed of chain folder, overfeeding is formed, diaphragm edge is attracted on the conveyer belt of mesh, and conveyer belt is provided with suction vacuum holding below
Put, conveyer belt is driven by buncher and is sent into the absorption of diaphragm edge in chain folder on the conveyor belt.Antivacuum negative-pressure adsorption conveying
Vacuum absorption device is not provided with formula, conveyer belt is equipped with above and below diaphragm, upper and lower two conveyer belts are clamped diaphragm and fed
Enter in chain folder.Fixture is preferably Double-station clamp.The present embodiment is preferred embodiment, is in preferred embodiment in other embodiment
Basis on the improvement that carries out, other embodiment can be combined with preferred embodiment to form more embodiments,
It will not be described here.
Overfeeding：For textile in dyeing and finishing processing, warp-wise is caused coupe elongation and breadth to narrow by larger pulling force.For
Overcome this unsure state, ensure the dimensionally stable of textile, so the speed of cloth feeding is adjusted in tentering or sizing,
Here it is overfeeding.Cloth feeding speed is more than stenter or the speed of forming machine is called positive overfeeding (or overfeeding, contracting code).Positive overfeeding causes
Warp thread is bounced back, and filling density rises, and grammes per square metre increase, warp-wise, which shrinks, to be reduced.If the speed of cloth feeding is less than the car of stenter or forming machine
Speed, which is just called to surpass in reverse, feeds (or negative overfeeding, drawing code).Surpass in reverse to feed and cause warp thread elongation, filling density declines, and grammes per square metre is reduced, and warp-wise, which shrinks, to be become
Greatly.
The present invention refer to weave " overfeeding " concept in dye transfer, and film overfeeding is exactly that the length for making clamped film is more than chain
Press from both sides length.The overfeeding of cloth is uniformly accumulated on cloth length direction, and in horizontal shaping by stretching, cloth is longitudinally retracted, and film surpasses
It is clip tongue (fixture) gripping section not build-up film to feed, and only accumulates amount of redundancy at gap between front and rear clip tongue, fold is formed, in horizontal stroke
When vertical contracting occurs to stretching, in clip tongue holding position longitudinal contraction does not occur for diaphragm edge, and vertical contracting, which occurs, by inner film makes longitudinal direction
Shrinkage factor reduces.And edge crevice place leaves fold, edge is cut off after horizontal pull-out mouth, is not the part of product.
Chain folder overfeed ratio and overfeeding speed difference correlation, overfeeding speed difference refer to Wei Mo mechanisms linear velocity and chain folder linear velocity
Difference, it is also relevant in chain folder length direction proportion with crack, if crack accounting greatly if can overfeed ratio with regard to big, just increase receive
Receive storage capacity.In the case of reducing chain pitch, crack size is constant, increases the gap accounting between clip, just can receive
More diaphragms are deposited, increase longitudinal direction retraction leeway.The adjustment of overfeed ratio size can change the size of longitudinal contraction rate, overfeeding
Mode reduces the limit of power of longitudinal contraction rate between 0~20%, and can stepless changing, after making horizontal drawing by the above method
The longitudinal contraction rate of film is controllable.
Certainly, the present invention can also have other various embodiments, in the case of without departing substantially from spirit of the invention and its essence,
Those skilled in the art can be made according to the present invention it is various it is corresponding change and deformation, but these it is corresponding change and
Deformation should all belong to the protection domain of appended claims of the invention.
Claims (4)
- A kind of 1. overfeeding formula film drawing process, it is characterised in that the film length clamped in film drawing process by fixture More than the chain folder length of stretching-machine, amount of redundancy is formed between film length and chain folder length during folder film feeding stretching, Amount of redundancy is piled up in the gap between fixture and forms fold.
- 2. overfeeding formula film drawing process according to claim 1, it is characterised in that horizontal in production line pulls in mouth Place clamps film and moved ahead, and carries out horizontal preheating, cross directional stretch, sizing and cooling technique successively, is beaten in horizontal drawing exit fixture Open, film is departed from fixture and complete cross directional stretch, film proceeds into follow-up equipment, unlatching is clipped in the chain of thin film separation Horizontal drawing porch is returned under state along circular orbit to be ready for pressing from both sides film work, the above-mentioned technological process of circulating repetition next time.
- 3. overfeeding formula film drawing process according to claim 1, it is characterised in that overfeeding mode is adsorbed for negative pressure of vacuum Conveying-type or traction are to roller mode.
- 4. overfeeding formula film drawing process according to claim 1, it is characterised in that the fixture is Double-station clamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510734334.6A CN105252752B (en) | 2015-11-03 | 2015-11-03 | A kind of overfeeding formula film drawing process |
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| CN201510734334.6A CN105252752B (en) | 2015-11-03 | 2015-11-03 | A kind of overfeeding formula film drawing process |
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| CN105252752A CN105252752A (en) | 2016-01-20 |
| CN105252752B true CN105252752B (en) | 2017-11-24 |
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| CN201510734334.6A Active CN105252752B (en) | 2015-11-03 | 2015-11-03 | A kind of overfeeding formula film drawing process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110744807B (en) * | 2019-10-14 | 2021-12-17 | 浙江洁美电子科技股份有限公司 | Production process of BOPET (biaxially-oriented polyethylene terephthalate) base film and BOPET base film prepared by production process |
| CN111037899B (en) * | 2019-12-31 | 2021-11-12 | 宁夏养正苗木有限公司 | Greenhouse film stretching device |
| CN114228123B (en) * | 2022-02-24 | 2022-06-14 | 佛山市盟思拉伸机械有限公司 | Film stretching device with uniform longitudinal and transverse stretching ratio |
| CN117466057B (en) * | 2023-12-28 | 2024-03-12 | 厦门尚达电子绝缘材料有限公司 | Improve glued membrane bullet cutting machine of security |
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| CN1054032A (en) * | 1990-02-17 | 1991-08-28 | 周理水 | Laterally expanding stretches with the manufacture method and the device of polyethylene diaphragm |
| CN100496948C (en) * | 2007-10-19 | 2009-06-10 | 常州裕兴绝缘材料有限公司 | Method for producing thick low hot shrinkage rate polyester film |
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Effective date of registration: 20210421 Address after: 100000, 3, Ping An Road, Shilong Economic Development Zone, Mentougou District, Beijing City, 1 Patentee after: BEIJING HUATENGJIAHE WINTEC, Ltd. Patentee after: LANGFANG HUATENG JIAHE EXTRUSION MACHINE MANUFACTURING Co.,Ltd. Address before: 100000, 3, Ping An Road, Shilong Economic Development Zone, Mentougou District, Beijing City, 1 Patentee before: BEIJING HUATENGJIAHE WINTEC, Ltd. |
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