CN209208066U - A kind of tear-proof membrane production equipment - Google Patents
A kind of tear-proof membrane production equipment Download PDFInfo
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- CN209208066U CN209208066U CN201821781299.9U CN201821781299U CN209208066U CN 209208066 U CN209208066 U CN 209208066U CN 201821781299 U CN201821781299 U CN 201821781299U CN 209208066 U CN209208066 U CN 209208066U
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Abstract
A kind of tear-proof membrane production equipment, including rack, oblique pull film device, a plurality of guide roller, heat device, cooling body and wrap-up, oblique pull film device, a plurality of guide roller, heat device, cooling body, wrap-up are successively set in the rack.Film cylinder is subjected to oblique extension by oblique pull film device, and cutting is at the continuous film of two sides oblique extension, then compound, cooling and shaping is carried out, finally wound by rolling-up mechanism, the draw direction of two sides film intersects, the continuous film for intersecting stretch-proof with regard to forming two directions, so that film obtains preferable tensile resistance in two directions.
Description
Technical field
The utility model relates to a kind of membrane production equipment more particularly to a kind of tear-proof membrane production equipments.
Background technique
The production method of film generally comprises blown film, extrusion, curtain coating etc., but film made of either way, all
Without tensile resistance, packaging material cannot be directly used as.
In order to make film that there is tensile resistance, need to carry out a degree of stretching to film, for example, longitudinal stretching or
Cross directional stretch, after film carries out longitudinal stretching, which obtains longitudinal tensile resistance, and lateral aspects do not have still
Tensile resistance, conversely, when film carries out after stretching horizontally, which obtains lateral tensile resistance, and longitudinal aspect according to
Do not have tensile resistance so.
In order to make film while there is lateral tensile resistance and longitudinal tensile resistance, film must just be carried out laterally
With the stretching of longitudinal both direction.
But the stretching of continuous film is typically just carried out along the longitudinal direction of film (being the extending direction of film) at present
It stretches, this, which leads to film only, has the tensile resistance in a direction.
The above-mentioned film being longitudinally stretched is can not to obtain vertically and transversely cross-linking stretch-resistance by continuous compound mode
Can, if to realize the vertical and horizontal tensile resistance of film, continuous film can only be transversely cut into multistage, then led to
It crosses the following two kinds mode and obtains vertically and transversely cross-linking tensile resistance:
(1) it stretching mode: after continuous film is transversely cut into multistage, by film stretching apparatus, holds this section thin
The head end of film and end, and stretched along longitudinal direction are fixed afterwards in place stretching, then again from the two sides of this section of film into
Row cross directional stretch all has film in machine and transverse direction certain so that film be made to obtain certain vertically and horizontally draw ratio
Tensile resistance；
(2) it complex method: after continuous film is transversely cut into multistage (need to generally be cut to square), is set by laminating adhesive
It is compound for carrying out two sections of films in such a way that draw direction intersects, so that it is certain to all have film in machine and transverse direction
Tensile resistance.
Above two mode is required to first cut off film by certain length, then carries out stretching or compound again, produces work
Sequence is complicated, thus also causes corresponding production equipment structure more complicated；In addition, prior, film can not be continuous, but film
Application often have certain length requirement, for example, it is desired to continuous 50 meters of film, the longitudinal length of film can be light
Easily meet, but the lateral length of film is then unable to reach at all, in addition, if passing through stretching mode, film stretching apparatus
Just at least need it is 50 meters long, then, if necessary to continuous 200 meters long, at least need at least 200 meters of stretcher certainly,
This undoubtedly causes stretcher and occupies huge area, this, which also results in film coiled at present, generally all only has longitudinal resist
The status of tensile property.
Summary of the invention
The technical problem to be solved by the present invention is to provide a kind of tear-proof membrane production equipment, this tear-proof film
Production equipment is able to produce out continuous two direction and intersects stretch-proof film, improves the tensile resistance of film.The technology of use
Scheme is as follows:
A kind of tear-proof membrane production equipment, including rack, it is characterized in that: further include oblique pull film device, a plurality of guide roller,
Heat device, cooling body and wrap-up, oblique pull film device, a plurality of guide roller, heat device, cooling body, wrap-up
It is successively set in the rack.
Above-mentioned oblique pull film device is used to film cylinder carrying out oblique extension, and cutting is at the continuous film of two sides oblique extension
(being connected in the opposite another side edge of longitudinally cutting line), oblique extension refer to that the length direction of draw direction and film has one
Angle.
Above-mentioned heat device generally comprises two hot-rollings disposed in parallel, can two be all hot-rolling, can also be it
In one be hot-rolling.
Above-mentioned cooling body generally comprises two chill rolls disposed in parallel, can two be all chill roll, can also only
Be wherein one be chill roll.
Above-mentioned wrap-up generally comprises winding bracket, Scroll and winding motor, the output shaft of winding motor and winding
Axis transmission connection.
Film cylinder is carried out oblique extension by oblique pull film device, and cutting at the continuous film of two sides oblique extension (in longitudinal direction
The opposite another side edge of cutting line is connected), it is then compound by continuous film progress of the heat device to two sides oblique extension,
Using the cooling and shaping of cooling body, finally wound by rolling-up mechanism.Since the continuous film of two sides oblique extension is multiple
After conjunction, the draw direction of two sides film intersects, and the continuous film that two directions intersect stretch-proof is just formed, so that film is two sides
Preferable tensile resistance is obtained upwards.
As a preferred embodiment of the present invention, the oblique pull film device include rotation put film device, spiral clamping and conveying device,
Cutter and traction roller；Rotation is put film device, spiral clamping and conveying device, traction roller and is successively set in the rack from bottom to top；It cuts
Spiral clamping and conveying device top is arranged in for knife or cutter is arranged on the rack and the top of close spiral clamping and conveying device, cutter cut open
Butt is to from the horizontal by an angle β, 0 ° of β≤90 ° <；Traction roller is in the upper outer of spiral clamping and conveying device, traction roller
Lead it is consistent with the cutting direction of cutter.
The effect of cutter is only to split film cylinder, and position and tilt angle (in addition to level) can be arbitrarily arranged, only
Will in the near top of spiral clamping and conveying device, when the blade of cutter straight down when, the cutting direction of cutter and horizontal
Direction angle in 90 °, when the blade of cutter is from the horizontal by 45° angle, the cutting direction of cutter is from the horizontal by 30 °
Angle, and so on.
It rotates and is passively rotated under the screw traction for putting the spiral clamping and conveying device of film device above, and with First Speed
Film cylinder is released, and spiral clamping and conveying device then spirally pinches film cylinder with second speed, second speed is greater than first
Speed, so that film cylinder is stretched by the hand of spiral, and cutter then opens the film cylinder cutting after spiral stretch, forms two
The continuous film (being connected in the opposite another side edge of longitudinally cutting line) of face oblique extension, then in rear traction roller along cutting side
To being drawn down, the cutting line of the continuous film of two sides oblique extension along longitudinal direction is folded, and then carries out heat seal process.
As the further preferred embodiment of the utility model, the spiral clamping and conveying device include longitudinal axis, tubular position-limited rack,
At least one spiral pinch mechanism, each spiral pinch mechanism include multiple pinch wheels, multiple pinch rollers, for driving each folder
The pinch actuation for sending wheel to rotate；Longitudinal axis is mounted on the rack along the vertical direction, and tubular position-limited rack is mounted on machine
On frame and the outside in longitudinal axis, the axis of the axis and tubular position-limited rack of longitudinal axis overlap；It is pinched in each spiral
In mechanism, each pinch wheel is installed in the periphery of longitudinal axis upwards and arranges by helical trajectory, and the axis of each pinch wheel is equal
Tangent in installed position and corresponding helical trajectory, each pinch roller is mounted on the inner wall of tubular position-limited rack, each pinch roller with
Corresponding pinch wheel is corresponded and is engaged.By the multipair pinch wheel and pinch roller arranged along helical trajectory, to film cylinder
It is pinched by the hand of spiral, thus stretch film cylinder by the hand of spiral, it is simpler in structure, and pass through arrangement
Multiple spiral pinch mechanisms, can make the stretching of film cylinder highly uniform.
As the further preferred embodiment of the utility model, the cutter is arranged on the tubular position-limited rack.
As the further preferred embodiment of the utility model, the quantity of the spiral pinch mechanism is three.
As the utility model further preferred embodiment again, three in three spirals pinch mechanism respective point
Pinch wheel is in same level.Three spiral pinch mechanisms are set, and three pinch wheels in its respective point are in same
On one horizontal plane, oblique extension is carried out to film cylinder by three points simultaneously in the same plane, the stretching of film cylinder is more equal
It is even.
As the utility model further preferred embodiment again, three pinch wheels arrangement in equilateral triangle.
As the further preferred embodiment of the utility model, the driving mechanism of each pinch wheel includes pinching electricity
Machine, retarder, driving wheel, driven wheel, transmission belt and transmission shaft, motor, retarder, driving wheel, driven wheel are installed in described
In rack, driving wheel is connect by retarder with motor drive is pinched, and driven wheel is connect by transmission belt with capstan drive, is passed
Moving axis is installed on the driven wheel；Each pinch wheel passes through pinch wheel seat, pinch wheel shaft is mounted on the longitudinal axis,
In, it pinches wheel seat and is mounted on longitudinal axis, pinch wheel shaft and be mounted on pinch wheel seat, pinch wheel, which is mounted on, to be pinched on wheel shaft, phase
Pass through flexible universal coupling connection between adjacent two pinch wheel shafts；The pinch wheel that transmission shaft passes through stretch universal coupling and the top
Axis connection.Each pinch wheel passes through pinch wheel seat, pinch wheel shaft is mounted on longitudinal axis, and between two neighboring pinch wheel shaft
By flexible universal coupling connection, in this way, all pinch wheels can be driven to rotate synchronously as long as through a pinch motor,
It is precisely synchronous, and structure and control are upper simpler.
As the further preferred embodiment of the utility model, each pinch roller passes through pinch roller seat, wheel pressing shaft, cylinder peace
On the tubular position-limited rack, wherein cylinder is mounted on tubular position-limited rack, and pinch roller seat is mounted on the piston rod of cylinder,
Wheel pressing shaft is mounted in pinch roller seat, and pinch roller is mounted on wheel pressing shaft.
As the further preferred embodiment of the utility model, the rotation puts film device and includes pedestal, put film shaft, put film
Rotating seat puts film motor, puts film roll axis and pinch roller, and putting film shaft may be rotatably mounted on pedestal, puts film rotating seat and is mounted on
The upper end for putting film shaft is put film motor and is mounted on and put on film rotating seat, puts film roll axis and pinch roller and may be rotatably mounted at rotation
On seat, pinch roller is sequentially connected with the output shaft for putting film motor.Entire volume film cylinder, which is mounted on, to be put on film roll axis, above screw clamp
It send under the traction of device, puts film rotating seat and passively rotate, and the speed for putting film is then controlled by pinch roller.
The utility model compared with prior art, has the advantages that
Film cylinder is carried out oblique extension by oblique pull film device, and cutting is at the continuous film of two sides oblique extension, then into
The compound, cooling and shaping of row, is finally wound by rolling-up mechanism, and the draw direction of two sides film intersects, and is just formed two directions and is handed over
The continuous film for pitching stretch-proof, so that film obtains preferable tensile resistance in two directions.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the preferred embodiment for the present invention；
The partial enlarged view of part A in Fig. 2 Fig. 1；
Fig. 3 is the periphery of longitudinal axis upwards by the schematic diagram of helical trajectory arrangement pinch wheel；
The partial enlarged view of part B in Fig. 4 Fig. 3.
Specific embodiment
It is described further with reference to the accompanying drawing with preferred embodiments of the present invention.
As shown in Figure 1, this tear-proof membrane production equipment, oblique in rack 1 including being reversely successively set on along film feeding
Film drawing device 2, a plurality of guide roller 3, heat device 4, cooling body 5 and wrap-up (being omitted in Fig. 1).
Oblique extension refers to that the length direction of draw direction and film has an angle.
Above-mentioned heat device 4 generally comprises two hot-rollings disposed in parallel, can two be all hot-rolling, can also be it
In one be hot-rolling.
Above-mentioned cooling body 5 generally comprises two chill rolls disposed in parallel, can two be all chill roll, can also only
Be wherein one be chill roll.
Above-mentioned wrap-up generally comprises Scroll and the winding motor for driving Scroll to rotate.
Above-mentioned oblique pull film device 2 includes that film device 22, spiral clamping and conveying device 23, cutter 24 and traction roller 25 are put in rotation；Rotation
Film device 22, spiral clamping and conveying device 23, traction roller 25 is relayed to be successively set on from bottom to top in rack 1；Cutter 24 is arranged in spiral shell
23 top of clamping and conveying device is revolved, the cutting direction of cutter 24 is from the horizontal by an angle β, 0 ° of β≤90 ° <；Traction roller 25 is in
The upper outer of spiral clamping and conveying device 23, the lead of traction roller 25 and the cutting direction of cutter 24 are consistent.
As shown in Figure 1, Figure 2, Figure 3 shows, above-mentioned spiral clamping and conveying device 23 includes longitudinal axis 231, tubular position-limited rack 232, three
Spiral pinch mechanism 233, each spiral pinch mechanism 233 include multiple pinch wheels 2331, multiple pinch rollers 2332, for driving
The pinch actuation 2333 that each pinch wheel 2331 rotates, above-mentioned cutter 24 are arranged on tubular position-limited rack 232；It is longitudinal
Axis 231 is mounted on along the vertical direction in rack 1, and tubular position-limited rack 232 is mounted on the outside in rack 1 and being in longitudinal axis 231,
The axis of longitudinal axis 231 and the axis of tubular position-limited rack 232 overlap；As shown in Figure 2 and Figure 3, three spiral pinch mechanisms 233
Three pinch wheels 2331 in respective point are in same level, and three arrangements in equilateral triangle of pinch wheel 2331；
In each spiral pinch mechanism 233, each pinch wheel 2331 is installed in the periphery of longitudinal axis 231 upwards and by spiral track
Mark arrangement, the axis of each pinch wheel 2331 is tangent in installed position and corresponding helical trajectory, and each pinch roller 2332 is pacified
On the inner wall of tubular position-limited rack 232, each pinch roller 2332 is corresponded and is engaged with corresponding pinch wheel 2331.It is logical
Multipair pinch wheel 2331 and pinch roller 2332 along helical trajectory arrangement are crossed, film cylinder 100 is pinched by the hand of spiral, thus
Stretch film cylinder 100 by the hand of spiral, it is simpler in structure, and by arranging multiple spiral pinch mechanisms 233,
The stretching of film cylinder 100 can be made highly uniform.
As shown in Figure 1, above-mentioned pinch actuation 2333 includes pinching motor 23331, retarder 23332, driving wheel
23333, driven wheel 23334, transmission belt 23335 and transmission shaft 23336, motor 23331, retarder 23332, driving wheel 23333,
Driven wheel 23334 is installed in rack 1, and driving wheel 23334 is by retarder 23332 and pinches the transmission connection of motor 23331,
Driven wheel 23334 is sequentially connected by transmission belt 23335 and driving wheel 23333, and transmission shaft 23336 is mounted on driven wheel 23334
On；As shown in Figure 2, Figure 3, Figure 4, above-mentioned each pinch wheel 2331 is mounted on by pinching wheel seat 2334, pinching wheel shaft 2335
On longitudinal axis 231, wherein pinch wheel seat 2334 and be mounted on longitudinal axis 231, pinch wheel shaft 2335 and be mounted on pinch wheel seat 2334
On, pinch wheel 2331, which is mounted on, to be pinched on wheel shaft 2335, passes through the universal coupling that stretches between two neighboring pinch wheel shaft 2335
2336 connections；As shown in Figure 1, transmission shaft 23336 is connect by flexible universal coupling 2336 with the pinch wheel shaft 2335 of the top.
Since each pinch wheel 2331 is mounted on longitudinal axis 231 by pinching wheel seat 2334, pinching wheel shaft 2335, and it is two neighboring
It pinches and is connected between wheel shaft 2335 by flexible universal coupling 2336, each pinch wheel shaft 2335 and flexible universal coupling 2336
Head and the tail are connected with each other, and are constituted worm drive structure, are also constituted helical trajectory, as long as in this way, passing through a pinch motor
23331 can drive all pinch wheels 2331 to rotate synchronously, precisely synchronous, and structure and control are upper simpler.
As shown in Fig. 2, above-mentioned each pinch roller 2332 is mounted on by pinch roller seat 2337, wheel pressing shaft 2338, cylinder 2339
On tubular position-limited rack 2332, wherein cylinder 2339 is mounted on tubular position-limited rack 2332, and pinch roller seat 2337 is mounted on cylinder 2339
Piston rod on, wheel pressing shaft 2338 is mounted in pinch roller seat 337, and pinch roller 2332 is mounted on wheel pressing shaft 2338.
Above-mentioned rotation put film device 22 include pedestal 221, put film shaft 222, put film rotating seat 223, put film motor 224,
Film roll axis 225 and pinch roller 226 are put, putting film shaft 222 may be rotatably mounted on pedestal 221, puts film rotating seat 223 and is mounted on and puts
The upper end of film shaft 222 is put film motor 224 and is mounted on and puts on film rotating seat 223, and putting film roll axis 225 and pinch roller 226 can turn
Dynamic to be mounted on rotating seat 223, pinch roller 226 is sequentially connected with the output shaft for putting film motor 224.Entire volume film cylinder 100 is installed
It on putting film roll axis 225, above under the traction of spiral clamping and conveying device 23, puts film rotating seat 223 and passively rotates, and put the speed of film
Degree is then controlled by pinch roller 226.
Film cylinder 100 is carried out oblique extension by oblique pull film device 2, and through 24 cutting of cutter at the continuous of two sides oblique extension
Film 100(is connected in the opposite another side edge of longitudinally cutting line), then by heat device 4 to the company of two sides oblique extension
Continuous film 200 carries out compound, using the cooling and shaping of cooling body 5, is finally wound by rolling-up mechanism.Since two sides is oblique
To stretching continuous film 200 it is compound after, the draw direction of two sides film intersects, and just forms two directions and intersects the continuous of stretch-proof
Film, so that film obtains preferable tensile resistance in two directions.The screw clamp of film device 22 above is put in rotation
It send and is passively rotated under the screw traction of device 23, and film cylinder 100 is released with First Speed, and spiral clamping and conveying device 23 is then
Film cylinder 100 is spirally pinched with second speed, second speed is greater than First Speed, to press spiral shell to film cylinder 100
Rotation direction is stretched, and cutter 24 then opens 100 cutting of film cylinder after spiral stretch, forms the continuous of two sides oblique extension
Film 200(is connected in the opposite another side edge of longitudinally cutting line), then drawn in rear traction roller 25 along cutting direction
Under, the cutting line 300 of the continuous film 200 of two sides oblique extension along longitudinal direction folds, and then carries out heat seal process.
In other embodiments, cutter 24 is arranged in the top in rack 1 and close to spiral clamping and conveying device 23 and (omits and be somebody's turn to do
The attached drawing of embodiment).
In addition, it should be noted that, the specific embodiments described in this specification, each section title etc. can not
Together, all equivalent or simple changes done according to structure, feature and principle described in the concept of the patent of the utility model are included in this
In the protection scope of utility model patent.Those skilled in the art of the present invention can be to described specific reality
Example is applied to do various modifications or additions or be substituted in a similar manner, structure without departing from the utility model or
Beyond the scope defined by this claim, it all should belong to the protection range of the utility model.
Claims (10)
1. a kind of tear-proof membrane production equipment, including rack, it is characterized in that: further including oblique pull film device, a plurality of guide roller, heat
Close mechanism, cooling body and wrap-up, oblique pull film device, a plurality of guide roller, heat device, cooling body, wrap-up according to
It is secondary to be arranged in the rack.
2. tear-proof membrane production equipment as described in claim 1, it is characterized in that: the oblique pull film device includes that film is put in rotation
Device, spiral clamping and conveying device, cutter and traction roller；Rotation is put film device, spiral clamping and conveying device, traction roller and is successively set from bottom to top
It sets in the rack；Cutter setting is arranged on the rack on spiral clamping and conveying device top or cutter and pinches dress close to spiral
The top set, the cutting direction of cutter is from the horizontal by an angle β, 0 ° of β≤90 ° <；Traction roller is in spiral clamping and conveying device
Upper outer, the lead of traction roller and the cutting direction of cutter are consistent.
3. tear-proof membrane production equipment as claimed in claim 2, it is characterized in that: the spiral clamping and conveying device includes longitudinal
Axis, tubular position-limited rack, at least one spiral pinch mechanism, each spiral pinch mechanism include multiple pinch wheels, multiple pinch rollers,
For driving the pinch actuation of each pinch wheel rotation；Longitudinal axis is mounted on the rack along the vertical direction, tubular
Position-limited rack is mounted on the rack and is in the outside of longitudinal axis, and the axis of the axis and tubular position-limited rack of longitudinal axis overlaps；?
In each spiral pinch mechanism, each pinch wheel is installed in the periphery of longitudinal axis upwards and arranges by helical trajectory, each
The axis of pinch wheel is tangent in installed position and corresponding helical trajectory, and each pinch roller is mounted on the inner wall of tubular position-limited rack
On, each pinch roller is corresponded and is engaged with corresponding pinch wheel.
4. tear-proof membrane production equipment as claimed in claim 3, it is characterized in that: cutter setting is limited in the tubular
On frame.
5. tear-proof membrane production equipment as claimed in claim 3, it is characterized in that: the quantity of the spiral pinch mechanism is three
It is a.
6. tear-proof membrane production equipment as claimed in claim 5, it is characterized in that: three spirals pinch mechanism respective point
On three pinch wheels be in same level.
7. tear-proof membrane production equipment as claimed in claim 6, it is characterized in that: three pinch wheels are in equilateral triangle
Arrangement.
8. tear-proof membrane production equipment as claimed in claim 3, it is characterized in that: the driving mechanism packet of each pinch wheel
Pinch motor, retarder, driving wheel, driven wheel, transmission belt and transmission shaft, motor, retarder, driving wheel, driven wheel is included to pacify
In the rack, driving wheel is connect by retarder with motor drive is pinched, and driven wheel is passed by transmission belt and driving wheel
Dynamic connection, transmission shaft are installed on the driven wheel；Each pinch wheel passes through pinch wheel seat, pinch wheel shaft is mounted on described indulge
To on axis, wherein pinch wheel seat and be mounted on longitudinal axis, pinch wheel shaft and be mounted on pinch wheel seat, pinch wheel is mounted on pinch
On wheel shaft, pass through flexible universal coupling connection between two neighboring pinch wheel shaft；Transmission shaft by flexible universal coupling with it is most upper
The pinch wheel axis connection of side.
9. tear-proof membrane production equipment as claimed in claim 3, it is characterized in that: each pinch roller pass through pinch roller seat,
Wheel pressing shaft, cylinder are mounted on the tubular position-limited rack, wherein cylinder is mounted on tubular position-limited rack, and pinch roller seat is mounted on gas
On the piston rod of cylinder, wheel pressing shaft is mounted in pinch roller seat, and pinch roller is mounted on wheel pressing shaft.
10. tear-proof membrane production equipment as claimed in claim 2, it is characterized in that: the rotation put film device include pedestal,
Film shaft is put, film rotating seat is put, puts film motor, puts film roll axis and pinch roller, putting film shaft may be rotatably mounted on pedestal, put film
Rotating seat is mounted on the upper end for putting film shaft, puts film motor and is mounted on and put on film rotating seat, putting film roll axis and pinch roller can turn
Dynamic to be mounted on rotating seat, pinch roller is sequentially connected with the output shaft for putting film motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821781299.9U CN209208066U (en) | 2018-10-31 | 2018-10-31 | A kind of tear-proof membrane production equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821781299.9U CN209208066U (en) | 2018-10-31 | 2018-10-31 | A kind of tear-proof membrane production equipment |
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| Publication Number | Publication Date |
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| CN209208066U true CN209208066U (en) | 2019-08-06 |
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ID=67457736
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| CN201821781299.9U Active CN209208066U (en) | 2018-10-31 | 2018-10-31 | A kind of tear-proof membrane production equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118404802A (en) * | 2024-07-01 | 2024-07-30 | 山东玖旺新材料科技有限公司 | Stretching device for high polymer film production |
-
2018
- 2018-10-31 CN CN201821781299.9U patent/CN209208066U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118404802A (en) * | 2024-07-01 | 2024-07-30 | 山东玖旺新材料科技有限公司 | Stretching device for high polymer film production |
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