EP3880592A1 - Procédé et dispositif d'enroulement successif d'un film continu ainsi que rouleau de film - Google Patents

Procédé et dispositif d'enroulement successif d'un film continu ainsi que rouleau de film

Info

Publication number
EP3880592A1
EP3880592A1 EP19802133.9A EP19802133A EP3880592A1 EP 3880592 A1 EP3880592 A1 EP 3880592A1 EP 19802133 A EP19802133 A EP 19802133A EP 3880592 A1 EP3880592 A1 EP 3880592A1
Authority
EP
European Patent Office
Prior art keywords
film web
winding
film
area
edge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP19802133.9A
Other languages
German (de)
English (en)
Inventor
Frank Hoffmann
Fabian Sundermann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Windmoeller and Hoelscher KG
Original Assignee
Windmoeller and Hoelscher KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Windmoeller and Hoelscher KG filed Critical Windmoeller and Hoelscher KG
Publication of EP3880592A1 publication Critical patent/EP3880592A1/fr
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H19/00—Changing the web roll
    • B65H19/22—Changing the web roll in winding mechanisms or in connection with winding operations
    • B65H19/26—Cutting-off the web running to the wound web roll
    • B65H19/267—Cutting-off the web running to the wound web roll by tearing or bursting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H19/00—Changing the web roll
    • B65H19/22—Changing the web roll in winding mechanisms or in connection with winding operations
    • B65H19/26—Cutting-off the web running to the wound web roll
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H35/00—Delivering articles from cutting or line-perforating machines; Article or web delivery apparatus incorporating cutting or line-perforating devices, e.g. adhesive tape dispensers
    • B65H35/0006—Article or web delivery apparatus incorporating cutting or line-perforating devices
    • B65H35/0073—Details
    • B65H35/008—Arrangements or adaptations of cutting devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H35/00—Delivering articles from cutting or line-perforating machines; Article or web delivery apparatus incorporating cutting or line-perforating devices, e.g. adhesive tape dispensers
    • B65H35/10—Delivering articles from cutting or line-perforating machines; Article or web delivery apparatus incorporating cutting or line-perforating devices, e.g. adhesive tape dispensers from or with devices for breaking partially-cut or perforated webs, e.g. bursters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/50—Auxiliary process performed during handling process
    • B65H2301/51—Modifying a characteristic of handled material
    • B65H2301/512—Changing form of handled material
    • B65H2301/5124—Stretching; Tentering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/50—Auxiliary process performed during handling process
    • B65H2301/51—Modifying a characteristic of handled material
    • B65H2301/515—Cutting handled material
    • B65H2301/5151—Cutting handled material transversally to feeding direction
    • B65H2301/51514—Breaking; Bursting; Tearing, i.e. cutting without cutting member
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/50—Auxiliary process performed during handling process
    • B65H2301/51—Modifying a characteristic of handled material
    • B65H2301/515—Cutting handled material
    • B65H2301/5152—Cutting partially, e.g. perforating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/50—Auxiliary process performed during handling process
    • B65H2301/51—Modifying a characteristic of handled material
    • B65H2301/515—Cutting handled material
    • B65H2301/5153—Details of cutting means
    • B65H2301/51532—Blade cutter, e.g. single blade cutter
    • B65H2301/515326—Multiple blade cutter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2515/00—Physical entities not provided for in groups B65H2511/00 or B65H2513/00
    • B65H2515/30—Forces; Stresses
    • B65H2515/31—Tensile forces

Definitions

  • the invention relates to a method for successively winding a film web according to the preamble of claim 1, an associated device according to the preamble of claim 9 and a film roll according to the preamble of claim 15.
  • the film web is first wound onto a first winding. Once this roll has reached its target format, the film web must be cut through and the new web start created in this way must be wound into a new roll.
  • a still empty winding tube is usually provided and / or - as in the case of sleeveless winding - a winding shaft.
  • the winding tube and / or the winding shaft and the film web are brought closer to one another, while the film web is further wound onto the first winding. Now a separation of the film web is effected, so that the new beginning of the web is formed.
  • the film web Since the film web is separated in its transport direction before the first winding, the rest of the film web is not guided and placed between the separating device and the first winding depending on the role undefined. The problem is exacerbated even if the web is under web tension before it hits the first roll. If the separating device then suddenly performs a separation, the remaining remainder of the film web snaps onto the first roll. This leads to a poorly usable slide start in one further processing, i.e. poor winding quality at the end of the winding. In addition, there may even be malfunctions in the winding device if the film web is wrapped around rolls or other components.
  • the object of the present invention is therefore to propose a method, a device and a film roll which brings about an improved quality of the winding, the end caused by the separation also being included.
  • At least one non-severed area remains as a result. This means that despite the definition of the end of the film web and the new start of the film web, these are still connected to one another by a connecting piece. Finally, it is provided that this non-severed area is subsequently torn off or severed.
  • Torn off is to be understood as a passive process in which the film web is separated by the action of force on the new end and the new beginning, whereas “separated” is to be understood as an active process in which a cutting device such as a cutting knife is used, um too to cut through the unbroken area.
  • “Following” means a later point in time compared to the point in time at which the new end and the new start of the film web are determined by the incomplete separating edge.
  • a film web is preferably to be understood as a plastic film web which, as a rule, can be under high tensile stress due to its elastic property.
  • the separation described is preferably carried out downstream of the new sleeve and / or winding shaft.
  • the term sleeve or winding is also understood to mean a plurality of sleeves or coils arranged next to one another, which are wound at the same time and to which the claimed method is applied at the same time.
  • Several cores or coils are usually wound at the same time when a film web is separated in the longitudinal direction, so that several individual webs, so-called blanks, are created.
  • connection of the new end and the new beginning of the web which initially continues to exist, means that the end of the web that is produced is under a web tension and can therefore be wound up without any wrinkling or other defects occurring .
  • the subsequent, complete separation can then take place closer to the first roll or by tearing off, which can also take place closer to the first roll.
  • the undissected area is stretched or stretched. Elongation or stretching is brought about in that the film web is subjected to a force which is greatly increased compared to the original web tension.
  • a separating device can be provided for this.
  • a separating device with which the separation can be carried out can generally consist of at least two parts, that is to say not only in relation to the embodiment mentioned, one part being activated later than another part in order to bring about the separation.
  • a separating device can also be provided, which separates areas of the film web at time intervals.
  • the usable part of the film extends until shortly before the end of the film web, and in this case this usable part has also been wound up with tensile stress. A loss of quality was thus avoided.
  • To carry out the separation of the initially non-severed area it is advantageous to drive the first winding until the non-severed area has been completely torn off or severed. In this way, in particular, an elongation of the region which is initially not severed is produced in a simple manner. Machine components to be provided specifically for this purpose can be dispensed with; here the drive, which is already available for winding, is sufficient.
  • the counterforce that serves to hold the new start of the film web can be provided in different ways, regardless of the embodiment just mentioned. It makes sense here to use the blocking effect of a separating device which is provided for introducing the separating edge. The new beginning of the film web then remains at the separating device while the new end continues to run. The non-severed area can be stretched or stretched in this way.
  • alternative or additional means for applying a counterforce to the new end can also be provided, such as clamping jaws or other clamping, holding or braking elements which slow down or stop the further transport of the new start of the film web.
  • a fixing force is provided with which the film web is fixed to the second sleeve and / or the winding shaft in order to provide a counterforce for tearing off.
  • This fixing force can increase or replace the counterforce caused by clamping, holding or braking elements.
  • This fixing force can also serve to fix the completely severed film web on the new winding tube and / or winding shaft.
  • the fixing force can be an electrostatic force in which, for example, an electrical charge is applied to the film web and / or the new winding tube and / or winding shaft, so that an attractive force arises.
  • the new winding tube and / or the winding shaft can be provided with an adhesive layer, for example by means of a double-sided adhesive tape or an adhesive application, to which the film web can stick.
  • a pressure roller that is used for the purpose of fixing the new winding tube and / or winding shaft can also be provided.
  • At least one knife is inserted into the film web to partially cut through the film web, the knife having at least one cutting edge which comprises interruptions.
  • at least one separating edge can be introduced into the film web, the non-severed area being caused by the interruption of the cutting edge.
  • the interruption can be provided, for example, as a recess in the knife on the cutting edge.
  • a plurality of knives which are spaced apart in the transverse direction of the transport path of the film web, are also conceivable. In this case, it is advantageous if the plurality of knives can be moved relative to one another in order to keep the non-severed area variable and to be able to adapt it to requirements, for example to the type of film.
  • At least one protective element that can be attached to areas of the cutting edge can also render the cutting edge ineffective in this area and thus ensure the interruption. Further measures and / or elements are conceivable, but are also meant by the term “interruptions”.
  • At least two knives are provided for partially severing the film web, the cutting edges of which are arranged parallel to one another and on different lines.
  • the at least two knives are therefore not or not only spaced apart in the transverse direction of the transport path of the film web, but instead or also in the direction of this transport path.
  • the distance can also be varied, for example by turning the knives about an axis that is orthogonal to the film web.
  • the interruption can thus also be eliminated in a simple manner in order to produce the conventional state for certain film webs, for example particularly tear-resistant films, with which the film web can be separated without interruption over the entire width.
  • At least one beam cutting through the film web comprising electro-optical waves, in particular a laser beam
  • the beam can be guided transversely to the film web, the beam being at least partially interrupted during the guidance.
  • the beam heats the film material locally, which leads to separation.
  • Transversal is also to be understood as a direction of movement which contains a transverse component in relation to the film web.
  • Such a system can work completely or at least partially completely contact-free, which means in particular that, for example, no web congestion can occur upstream of the cutting knife, which can lead to undesirable operating states.
  • a first winding point in which the film web can be wound up to form a first winding
  • a second winding station in which a winding tube and / or a winding shaft can be provided,
  • a movement device with which the winding tube and / or the winding shaft and the film web upstream of the first winding can be approached and / or brought into contact with one another,
  • a movement device is to be understood as a device which ensures movement of the first winding relative to the new winding tube and / or winding shaft, but also movement of a machine element with which the film web can be moved.
  • a deflection roller can be introduced into the transport path of the film web, so that the transport path can be changed
  • a control device is provided with which a drive with which the first winding can be driven in a rotationally lockable manner can be controlled, the control device feeding a control signal for ending the rotation driving to the drive after the film web at the interruption of the separating edge is torn or severed.
  • control device thus ensures that, in contrast to winding devices of the prior art, the first roll is driven in rotation until the film web breaks or is subsequently separated in order to separate the region which was initially undivided.
  • the control device can be supplied with a signal from a sensor device which detects the tearing or disconnection.
  • An optical sensor can be provided or also a motor current monitoring sensor, which detects that the motor no longer has to apply the torque to be applied to stretch or tear the film web.
  • the control device can, however, also send the control signal to end the rotary drive after a certain elapsed time.
  • At least one force supply element is provided, with which the film web can be fixed to the winding tube and / or the winding shaft, so that a counterforce for tearing off can be provided.
  • power supply elements can be, for example, an electrostatic charging device, a double-sided adhesive tape or an adhesive application. Further details have already been described in connection with the method according to the invention, which are also valid here.
  • the separating device comprises at least one knife for insertion into the film web, the knife comprising at least one cutting edge with interruptions.
  • the interruption is arranged in the middle of the knife, so that the region of the film web that is initially not severed is also arranged in the center, as seen in the transverse direction.
  • an uninterruptible knife is also conceivable, the cutting edge of which is shorter than the width of the film web, so that an undissected area is formed on one edge or on both edges of the film web.
  • a film roll with a wound film web the beginning of the film web, viewed in the radial direction, being arranged inside and the end of the film web outside, and which according to the invention is characterized in that the end of the film web has at least one area comprises at least one cutting edge and at least one area which projects beyond the cutting edge in the winding direction.
  • the rear end as seen in the direction of travel of the film web, is not cut smoothly in the transverse direction, but rather has at least one area which projects beyond the separating or cutting edge.
  • the whole The separating edge has a discontinuous course and can be slightly frayed.
  • the winding direction of the film roll is opposite to the transport direction of the film web in the winding device, that is, it runs along the film web from the inside to the outside. It is advantageous that the film roll thus has a gripping section with which the film end can be easily detached from the outer circumference of the film roll by hand or within a machine.
  • the area projecting beyond the cut edge has an elongation which is in particular greater than the elongation of the film web of the remaining film roll.
  • the stretched area is usually characterized by other material and geometric properties, in particular by a smaller film thickness and a different extensibility compared to the film web of the other film roll.
  • the region projecting beyond the cut edge comprises a tear-off edge, which in particular comprises a random edge transition.
  • a tear-off edge which in particular comprises a random edge transition.
  • Such an edge distribution is therefore not reproducible.
  • FIG. 1 side view of a schematic diagram of an inventive Winding device
  • FIG. 1 shows a basic illustration of a winding device 1, only the components essential to the invention being shown.
  • the film web 2 can be seen, which is conveyed in the transport direction z along a transport path. It is not shown that the film web can also be transported over further rollers or rollers, so that the transport path does not necessarily run in a straight line.
  • the film web 2 is wound on a first roll 3, which rotates around a winding shaft 4 of the winding device 1 in the direction of rotation D in order to wind the film web 2.
  • the winding shaft 4 can carry with a winding tube 5, which is part of the winding 3 in that, after the completion of the winding 3, it is pushed off the winding shaft 4 together with the wound film web.
  • so-called sleeveless winding is also possible, in which the film web can be wound directly on the winding shaft 4.
  • the winding shaft 4 is connected directly or indirectly to the machine frame of the winding device.
  • the winding shaft 4 is often arranged rotatably on a component that can be displaced relative to the machine frame.
  • a component can be, for example, a carriage or, in particular in a so-called turning winder, a turntable.
  • the new winding shaft 5, the function of which will be described in more detail below, can be introduced into the slide at the position of the first winding shaft 4 before or after the winding change or - in the case of a turntable - can also be rotatably mounted in the turntable. Further winding shafts are conceivable, which in particular can also be arranged in a turntable.
  • winding shafts can be detached from the threshing disc at least at one of their ends, while the second end is preferably still supported in the turntable. So that the finished Winding, or in the case of muddy winding, the finished windings can be easily removed from the respective winding shaft.
  • the new winding shaft 6 already carries a winding tube 7 and is already close to the transport path of the film web 2.
  • a separating device which in the exemplary embodiment shown comprises a knife 8, is also arranged close to the transport path of the film web 2 and is in an inactive position, in which it is kept ready for a separation of the film web 2.
  • the knife 8 is arranged on a knife holder 9.
  • the knife carrier comprises at least one lever arm 10 which is rotatable about an axis of rotation 11, so that the knife pivots into an active position in the Transport path of the film web 2 can be introduced to provide them with separating cuts.
  • the lever arm 10 can be mounted, for example, on the machine frame or on the component that moves the winding shafts relative to the machine frame, such as a turntable or slide, via the axis of rotation 11.
  • FIG. 2 now shows the same winding device as FIG. 1, but with a new winding shaft 6 which has already been brought further to the film web 2 and with a separating device which has just been introduced into the transport path of the film web 2.
  • the new winding shaft 6 is preferably arranged upstream of the knife 8, ie counter to the transport direction z.
  • FIG. 3 shows the same situation as FIG. 2, but in a top view. It can be seen particularly well in this view that the separating device, that is to say the knife 8 in the exemplary embodiment shown, comprises a cutting edge 12 which has an interruption 13. The effect of this interrupted cutting edge is clear from Figures 4 to 8.
  • FIG. 4 shows the same view as FIG. 3, but with the film web 2 being transported further onto the first roll 3. Because of the interruption 13 of the cutting edge 12 of the knife 8, separating edges 14 have arisen since the Cutting edge 12 has severed the film web, but the film web has not been changed in the region of the interruption 13, the separating edges in the exemplary embodiment shown running approximately in the transverse direction y to the transport direction z. The separating edges 14 now form the new end of the film web 2. In the view in FIG. 4, the respective counterparts of the separating edges 14 are hidden behind the cutting knife 8 and form the new beginning of the film web 2, which is to be wound onto the new roll.
  • FIG. 6 now shows a particularly preferred exemplary embodiment of the invention, in which the non-severed area 15 is further stretched until the separating edges 14 rest on the underlying layer of the wound film web or at least almost rest on it.
  • the separation of the non-cut area 15 is effected. It is shown that the winding 3 continues to be subjected to a driving force until the non-severed area tears, which is shown in FIG. 7.
  • a further separating edge 16 is created, which is set back with respect to the separating edges 14, that is to say projects beyond the separating edges 14 counter to the transport direction z.
  • the separating edge 16 has a random edge distribution, which is therefore generally not reproducible.
  • a separation can also take place actively by means of a suitably designed separation device.
  • a further knife can be provided for this.
  • the interruption 13 of the cutting edge 12 is only a section 17 of the cutting edge set back in the orthogonal direction x (see FIG. 1) of the film web 2.
  • the knife 8 can then be moved so far into the transport path of the film web 2 that the cutting edge 12 creates the separating edges, but the set-back section 17 of the cutting edge has not yet come into contact with the undivided area 15. Should now become one If the complete separation is brought about at a later point in time, the knife 8 can be moved further in a subsequent step, so that the recessed section 17 also gets into the transport path of the film web and cuts through it.

Abstract

L'invention concerne un procédé d'enroulement successif d'un film continu sur plusieurs bobines, le film continu étant enroulé en une première bobine et un manchon et/ou un arbre d'enroulement destiné à former une deuxième bobine suivante et le film continu étant rapprochés l'un de l'autre et/ou amenés en contact en amont de la première bobine. Une séparation du film continu est provoquée, une fin du film continu étant ainsi formée, laquelle est enroulée sur la première bobine, et un nouveau début du film continu étant ainsi formé, lequel est enroulé sur le deuxième manchon. Pour la séparation du film continu, celui-ci est sectionné partiellement dans la direction transversale, au moins une arête de séparation et au moins une zone non sectionnée demeurant dans la direction transversale, la zone non sectionnée étant ensuite détachée ou séparée.
EP19802133.9A 2018-11-16 2019-11-07 Procédé et dispositif d'enroulement successif d'un film continu ainsi que rouleau de film Pending EP3880592A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018219658 2018-11-16
PCT/EP2019/080565 WO2020099238A1 (fr) 2018-11-16 2019-11-07 Procédé et dispositif d'enroulement successif d'un film continu ainsi que rouleau de film

Publications (1)

Publication Number Publication Date
EP3880592A1 true EP3880592A1 (fr) 2021-09-22

Family

ID=68542626

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19802133.9A Pending EP3880592A1 (fr) 2018-11-16 2019-11-07 Procédé et dispositif d'enroulement successif d'un film continu ainsi que rouleau de film

Country Status (3)

Country Link
US (1) US20210403267A1 (fr)
EP (1) EP3880592A1 (fr)
WO (1) WO2020099238A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115557286A (zh) * 2022-08-31 2023-01-03 佛山市麦克罗美的滤芯设备制造有限公司 卷膜方法

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US1532753A (en) * 1923-05-31 1925-04-07 Eastman Kodak Co Automatic film-spooling machine
US2272940A (en) * 1940-03-23 1942-02-10 George A Gerard Method of winding paper and mechanism therefor
US2507144A (en) * 1948-04-02 1950-05-09 Peter J Christman Web winding machine
US2776094A (en) * 1953-12-21 1957-01-01 Eastman Kodak Co Automatic spooling machine for roll film
US2970785A (en) * 1956-08-01 1961-02-07 Ibm Cutting apparatus
JPS5229388B2 (fr) * 1973-04-18 1977-08-02
US3912571A (en) * 1974-06-03 1975-10-14 Crown Zellerbach Corp Roll product with manually graspable tail end and manufacture thereof
US4280669A (en) * 1980-01-21 1981-07-28 Magna-Graphics Corporation Automatic web rewinder for tensioned web
FI75788C (fi) * 1985-11-28 1988-08-08 Valmet Paper Machinery Inc Foerfarande och anordning foer rullning av materialbana.
US5368253A (en) * 1993-04-23 1994-11-29 Faustel Incorporated Continuous rewind with no-fold-back splicer
DE29610199U1 (de) * 1996-06-13 1997-10-16 Beloit Technologies Inc Querschneidevorrichtung für Wickelmaschinen
FR2781717B1 (fr) * 1998-07-29 2000-10-20 Darlet Marchante Technologies Dispositif d'introduction automatique d'un ruban de film de matiere synthetique dans une machine d'etirage transversal
DE10152162A1 (de) * 2001-10-25 2003-05-08 Hauni Maschinenbau Ag Vorrichtung zum Transport von band- oder streifenförmigem Material
WO2003050026A1 (fr) * 2001-12-12 2003-06-19 Voith Paper Patent Gmbh Procede et dispositif de transfert d'une bande de matiere en deplacement sur un mandrin d'enroulement
CN1321868C (zh) * 2002-02-06 2007-06-20 株式会社片冈机械制作所 片材分割卷取装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115557286A (zh) * 2022-08-31 2023-01-03 佛山市麦克罗美的滤芯设备制造有限公司 卷膜方法

Also Published As

Publication number Publication date
US20210403267A1 (en) 2021-12-30
WO2020099238A1 (fr) 2020-05-22

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