WO2009127121A1 - 滚筒法生产聚乙烯醇膜的设备 - Google Patents

滚筒法生产聚乙烯醇膜的设备 Download PDF

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Publication number
WO2009127121A1
WO2009127121A1 PCT/CN2009/000394 CN2009000394W WO2009127121A1 WO 2009127121 A1 WO2009127121 A1 WO 2009127121A1 CN 2009000394 W CN2009000394 W CN 2009000394W WO 2009127121 A1 WO2009127121 A1 WO 2009127121A1
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WIPO (PCT)
Prior art keywords
outer cylinder
polyvinyl alcohol
film
alcohol film
cylinder
Prior art date
Application number
PCT/CN2009/000394
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English (en)
French (fr)
Inventor
李清让
Original Assignee
Li Qingrang
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Filing date
Publication date
Application filed by Li Qingrang filed Critical Li Qingrang
Publication of WO2009127121A1 publication Critical patent/WO2009127121A1/zh

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/24—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of indefinite length
    • B29C41/26—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of indefinite length by depositing flowable material on a rotating drum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
    • B29C35/041—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
    • B29C35/06—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam for articles of indefinite length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2029/00—Use of polyvinylalcohols, polyvinylethers, polyvinylaldehydes, polyvinylketones or polyvinylketals or derivatives thereof as moulding material
    • B29K2029/04—PVOH, i.e. polyvinyl alcohol

Definitions

  • the present invention relates to an apparatus for producing a polyvinyl alcohol film, and more particularly to an apparatus for producing a polyvinyl alcohol film by a roll method capable of greatly improving production efficiency. Background technique
  • the invention patent of the publication No. CN1226124C discloses a method and a device for producing a polyvinyl alcohol film.
  • the structure of the apparatus is as shown in FIG. 1, and includes the following components arranged in sequence: a dissolution vessel 1 for preparing a polyvinyl alcohol aqueous solution, a defoaming tank 4, a film forming machine 32, a film unwinding roller 16, and a front stretching roller group. 6 and the idler roller 7, the expansion roller group 8, the heat drawing roller group 9, and the roll film friction roller 11 provided in the heat treatment chamber 33, and the liquid supply tank 17 is provided below the film forming machine 32.
  • the production method using the apparatus includes the steps of: preparing an aqueous solution of polyvinyl alcohol in the dissolution vessel 1; defoaming in the defoaming tank 4; forming a film on the film forming machine 32; modifying; conditioning; winding. See Figure 1.
  • the polyvinyl alcohol aqueous solution in the dissolution tank 1 enters the defoaming tank 4 through the pipeline, and after defoaming, enters the liquid supply tank 17 from the feeding pipe; the film forming machine is started, the outer cylinder 22 is rotated, and is immersed in the liquid supply tank 17. Part of the outer cylinder draws an aqueous solution of polyvinyl alcohol.
  • the water in the aqueous solution of polyvinyl alcohol adhered to the outer surface of the outer cylinder evaporates continuously to form a polyvinyl alcohol film; then, under the action of the unwinding roller 16, the poly The vinyl alcohol film is peeled off from the outer cylinder; it is modified by the front stretching roll group 6; the humidity is adjusted in the heat treatment chamber 33; and finally wound up.
  • the structure of the film forming machine 32 includes: an outer cylinder 22, an inner cylinder 23 and an inner heating device which are disposed coaxially.
  • the portion between the inner and outer cylinders is a water jacket 30.
  • a hollow front axle 2 and a hollow rear axle 3 are fixed to the inner cylinder 23, and the front and rear axles are fixed to the inner cylinder bracket 27.
  • the outer cylinder 22 is rotatably supported on the front and rear axles by bearings.
  • An internal heating device is used to heat the water jacket 30, and the structure includes a heating tube 29 and an overflow tube 24.
  • the heating tube 29 is composed of a horizontal portion located inside the hollow front shaft 2, a vertical portion attached to the front side wall of the inner cylinder 23, and a horizontal portion attached to the inner circumferential bottom wall of the inner cylinder 23.
  • a plurality of through holes 45 are defined between the heating pipe 29 attached to the inner bottom wall portion of the inner cylinder 23 and the circumferential bottom wall of the inner cylinder 23.
  • the overflow pipe 24 is composed of a horizontal portion located inside the hollow rear shaft 3, a vertical portion attached to the rear side wall of the inner cylinder 23, and a horizontal portion attached to the inner circumferential wall of the inner cylinder 23. Which is attached to the inner cylinder 23
  • a plurality of through holes 45 are formed between the overflow pipe 24 of the peripheral wall portion and the circumferential top wall of the inner cylinder 23.
  • the film forming heating process of the polyvinyl alcohol aqueous solution in the film forming machine 32 is: first pumping water into the water jacket 30 from the overflow outlet 47 of the overflow pipe 24; after the water jacket is filled with water, it is introduced into the heating pipe 29
  • the low-pressure saturated steam is used to heat the water jacket, and further heats the outer cylinder 22 to evaporate the water in the polyvinyl alcohol film attached to the outer surface of the outer cylinder 22; as the steam continuously condenses, the water in the water jacket 30 is broken.
  • the increased water is discharged by the overflow pipe 24.
  • the temperature in the region near the heating pipe 29 is high, and the temperature in the region far from the heating pipe 29 is low. . Since there is heat loss along the way as the steam flows along the heating line 29, the temperature differs even in the same distance from the heating tube 29. Specifically, the temperature of the water jacket near the vertical portion of the heating pipe 29 is higher than the temperature of the water jacket near the bottom wall of the inner cylinder 23. Further, also in the vicinity of the circumferential bottom wall region of the inner cylinder 23, the temperature from the front end to the rear end of the water jacket along the inner cylinder 23 is also gradually lowered.
  • the overflow water pipe 24 and the heating pipe 29 are both disposed in the inner cylinder 23, so that the circumferential wall of the inner cylinder 23 and the corresponding horizontal portion of the overflow water pipe 24 and the heating pipe 29 are required. A plurality of through holes 45 are provided between them. Whether it is first punching and then correcting the installation, or installing and then punching is very troublesome, it consumes a lot of manpower and material resources.
  • the rotary outer cylinder is used to draw the solution in the liquid supply tank, so that the notch of the liquid supply tank must ensure a sufficiently large size, so the solution level in the liquid supply tank The area exposed to the air is large and can easily lead to the formation of a film on the surface of the solution.
  • This type of film seriously affects the continuity of the process. In the actual production process, it is often necessary to stop the cleaning, otherwise the yield will be seriously reduced.
  • this apparatus suitable for the sputum film forming method due to the surface tension of the liquid The reason is that the film thickness can only be controlled below 25 microns, and the finished film has a single variety.
  • the outer cylinder 22 is made of ordinary steel material, and in order to facilitate film uncovering, a coating is usually provided on the outer surface of the outer cylinder 22. Not only is the cost high, but in the production process, the coating often falls off, and it is necessary to repeatedly polish and apply to repair the coating. It also needs to be treated by rogue baking, etc. It is very troublesome, and it is difficult to achieve continuous industrial production due to lost time or wrong time. Summary of the invention
  • Embodiments of the present invention are directed to overcoming the deficiencies of the prior art described above, and provide an apparatus for producing a polyvinyl alcohol film by a high-efficiency roller method.
  • embodiments of the present invention provide an apparatus for producing a polyvinyl alcohol film by a roll method, including a film forming machine including a fixed front mounting frame and a hollow front axle and a hollow rear axle.
  • a film forming machine including a fixed front mounting frame and a hollow front axle and a hollow rear axle.
  • the utility model further comprises a polyvinyl alcohol film disposed on the outer surface of the outer cylinder for attaching to the surface of the outer cylinder
  • An external steaming device in which the moisture is quickly evaporated.
  • the external steaming device comprises a wind-distributing shroud having a steam outlet outside the outer cylinder and at least two heaters uniformly disposed in the wind-distributing shroud, and the wind-distributing shroud is attached with respect to the outer cylinder A portion of the polyvinyl alcohol film is uniformly provided with a plurality of air guiding ports.
  • An air exhaust pipe is connected to the steam outlet of the wind deflector, and a centrifugal fan is installed in the air exhaust pipe.
  • a plurality of paddles are evenly arranged on the inner wall of the outer cylinder.
  • the utility model further comprises a cloth pipe having a discharge port, wherein the width of the discharge port is equal to the length of the outer cylinder, and the gap between the discharge port and the outer cylinder is the same, and the cloth pipe under the discharge port is provided with a seal. pad.
  • the inner heating device includes a heating tube and an overflow tube, wherein the front shaft extends into a center position of the inner cylinder, and a heat medium conduit communicating with the heat medium source is disposed in the front shaft.
  • the heating pipe has a "T" shape, the vertical portion thereof is in communication with the front shaft, the horizontal portion is located in the water jacket, and the horizontal portion is provided with a plurality of steam holes.
  • the plurality of steam holes are axially symmetrically distributed, and the apertures are sequentially enlarged from the middle to the both ends.
  • the plurality of steam holes are axially symmetrically distributed, and the pore sizes of the plurality of steam holes are the same, and the density is gradually dense from the middle to the both ends.
  • the overflow pipe has an "L" shape, a vertical portion thereof is in communication with the rear axle, and a horizontal portion is located in the water jacket.
  • the front axle and the rear axle are of unitary structure, forming a through shaft, and a baffle is disposed in the through shaft corresponding to the rear axle position.
  • the outer cylinder is made of a stainless steel material.
  • the apparatus for producing a polyvinyl alcohol film by the roller method of the present invention is provided with an external evaporation device for evaporating a polyvinyl alcohol film on the outside of the film forming machine, and an internal heating device and an external evaporation device are used in production. Double heating, a large amount of heat acts on the outer cylinder at the same time, and the moisture in the polyvinyl alcohol film on the outer surface thereof is rapidly evaporated, so the apparatus of the present invention greatly improves the production efficiency.
  • FIG. 1 is a schematic structural view of a conventional polyvinyl alcohol film production apparatus
  • Figure is a schematic view showing the structure of a film forming machine in an existing polyvinyl alcohol film production apparatus
  • Figure 3 is a longitudinal sectional structural view of a film forming machine in an apparatus for producing a polyvinyl alcohol film by a roller method of the present invention, in order to see the internal structure, the external steaming device is removed;
  • Figure 4 is a schematic cross-sectional structural view of a film forming machine in an apparatus for producing a polyvinyl alcohol film by a roll method of the present invention. detailed description
  • the apparatus for producing a polyvinyl alcohol film by a roller method of the present invention comprises a dissolution vessel for preparing an aqueous solution of polyvinyl alcohol, a defoaming tank, a film forming machine, a film unwinding roller, a front stretching roller group, and a heat treatment chamber. Roller, expanded roll set, hot drawn roll set and roll film friction roll. Except for the film forming machine and the feeding tube, the other parts are the same as the prior art, and will not be described again.
  • the film forming machine in the apparatus of the present invention comprises an inner cylinder 23 fixedly mounted to the frame, an outer cylinder 22 rotatable relative to the inner cylinder 23, and an inner heating device and an outer evaporation device.
  • the external evaporation device can adopt any existing structure as long as it can be attached to the outer surface of the outer cylinder 22.
  • the moisture in the polyvinyl alcohol film can be quickly evaporated to dryness. Only the preferred external evaporation device structure is given below. Referring to Fig.
  • the external steaming device comprises a windshield shroud 5 having a steam outlet outside the outer cylinder 22 and four heaters 20 uniformly disposed in the windshield shroud 5, on the windshield deflector 5
  • a plurality of air guiding ports 10 are provided with respect to the outer cylinder 22.
  • heat from the heater 20 acts on the polyvinyl alcohol film on the outer surface of the outer cylinder 22, causing the moisture therein to evaporate quickly and emerge from the steam outlet.
  • the heater can be a hot air blower or the like, and the number is not limited to four, and can be appropriately increased or decreased according to the size of the film forming machine.
  • the external steaming device is arranged outside the film forming machine, while the water jacket of the film forming machine is heated within the outer cylinder, the external steaming device is evaporated to the outside of the outer cylinder, which is greatly improved. Production efficiency.
  • the exhaust pipe 12 may be installed at the steam outlet of the windshield baffle 5, and the centrifugal fan 13 may be installed in the exhaust pipe 12.
  • the steam emerging from the steam outlet is centrifugally condensed into distilled water by the centrifugal fan 13 in the exhaust pipe 12.
  • the distilled water formed by centrifugal condensation flows out through the drainage tube.
  • a large amount of high-value distilled water can be produced while producing a polyvinyl alcohol film.
  • the inner cylinder 23 in the film forming machine has a hollow front shaft 2 and a hollow rear shaft 3, and a heat medium conduit 26 communicating with a heat medium source is disposed in the front shaft 2, wherein the heat medium may be hot steam, hot oil, hot air Or hot water, etc.
  • the heat source can be electricity, oil, gas, and the like.
  • the mode can be conduction, radiation, and the like.
  • the front shaft ⁇ 2 end portion projects into the center position of the inner cylinder 23.
  • the internal heating device includes a heating tube 29 and an overflow tube 24.
  • the heating tube 29 has a " ⁇ " shape, one end of the vertical portion communicates with the end of the front shaft 2, and the other end is connected to the horizontal portion thereof through the circumferential wall of the inner cylinder 23; the horizontal portion is placed between the inner and outer cylinders In the sleeve 30, the length is equal to the length of the inner cylinder 23, and the horizontal portion can be closely attached to the inner cylinder 23, so that the arrangement is relatively firm, and of course, it can also have a certain gap with respect to the inner cylinder 23.
  • the vertical portion of the " ⁇ "-shaped heating pipe 29 enters its horizontal portion, since the vertical portion of the " ⁇ "-shaped heating pipe 29 is located in the middle of the inner cylinder.
  • the horizontal portion of the " ⁇ "-shaped heating pipe 29 is provided with a plurality of steam holes 31.
  • the plurality of steam holes 31 are arranged in an axisymmetric manner, and the apertures are sequentially enlarged from the middle to the both ends.
  • a plurality of steam holes 31 are arranged in an axisymmetric manner, and the plurality of steam holes 31 have the same aperture, and the density is gradually dense from the middle to the both ends.
  • the above-described distribution of the plurality of steam holes 31 further improves the uniformity of heat distribution in the axial direction of the outer cylinder.
  • these steam holes 31 can also be other points. Cloth form. Since the horizontal portion of the heating pipe 29 is placed in the water jacket 30, complicated steps such as processing the through hole in the inner cylinder 23 and aligning the processed through hole with the steam hole are avoided, thereby saving manpower and material resources.
  • the overflow pipe 24 has an "L" shape with one end of the vertical portion communicating with the rear axle 3 and the other end passing through the circumferential wall of the inner cylinder 23 to connect the horizontal portion thereof; the overflow port 25 at the end of the horizontal portion Located at the center axis of the inner cylinder 23, corresponding to the vertical portion of the "T" shaped heating tube 29.
  • the horizontal portion is placed in the water jacket 30 and can be closely attached to the inner cylinder 23 or have a certain gap with respect to the inner cylinder 23.
  • the front axle 2 and the rear axle 3 may be a unitary structure, that is, a hollow through shaft is formed, and a baffle 18 is required to be disposed in the hollow through shaft corresponding to the rear axle 3 to ensure access.
  • the steam to the heating tube 29 can smoothly enter the water jacket 30 without passing directly through the hollow through shaft.
  • a plurality of radially distributed water-drawing plates 14 are disposed on the inner wall of the outer cylinder 22 (see Fig. 4).
  • the paddle 14 agitates the water in the water jacket 30, which facilitates the heat transfer between the various portions of the water jacket, so that the temperature of each portion of the water jacket is quickly balanced.
  • the uniformity of heat distribution in the circumferential direction of the outer cylinder is effectively improved.
  • the cloth pipe 15 in this embodiment has a tubular shape and has a feed port and a discharge port.
  • the width of the discharge port is equal to the length of the outer cylinder 22, and the gap between the discharge port and the outer cylinder 22 along the width direction thereof. The same, this is to ensure uniform thickness of the polyvinyl alcohol film.
  • a gasket 19 is provided on the cloth pipe 15 below the discharge port.
  • the feed port of the cloth tube 15 can be in direct communication with the defoaming tank 4 (see Fig. 1) or with the feed tube in the existing equipment.
  • the discharge port of the cloth pipe 15 and the outer cylinder 22 work together, that is, the polyvinyl alcohol solution and
  • the initial contact of the film forming machine outer cylinder is on the upper side or the side below or above the outer cylinder, so as to ensure that the polyvinyl alcohol solution can be applied to the outer cylinder.
  • the polyvinyl alcohol solution is directly discharged from the cloth tube 15 to the outer tube 22 of the film forming machine. Different from the traditional method of filming polyvinyl alcohol solution, thus avoiding polyvinyl alcohol dissolution Liquid crust lost work, further improving production efficiency.
  • the polyvinyl alcohol film having a thickness of 30 ⁇ m or more can be produced by using the apparatus of the present invention, enriching the variety of the polyvinyl alcohol film.
  • the outer cylinder 22 of the film forming machine is made of a dense stainless steel material, and the surface of the stainless steel is polished to a finish of eleven. This not only makes it easy to uncover the film during the production process, but also improves the film formation quality and at the same time helps to reduce costs.
  • the method for producing a polyvinyl alcohol film by the drum method of the present invention comprises the following steps:
  • the polyvinyl alcohol aqueous solution in the dissolution kettle flows into the filter from the discharge pipe, and is filtered and then defoamed into the defoaming tank; the filtration pressure is 0.2 ⁇ 1.0Mpa, the filtration precision is 0.2 micron, and the defoaming temperature is 85 ⁇ 95 °C, A defoaming agent is used.
  • the polyvinyl alcohol aqueous solution after the completion of defoaming is sprayed or coated by the cloth tube 15 onto the upper or lower side or the upper side of the film forming machine, and the outer cylinder is rotated to form a polyvinyl alcohol film on the outer surface thereof. Under the action of internal heating and evaporation of the external steaming device, the water in the polyvinyl alcohol film is quickly evaporated to become a film;
  • the film is peeled off from the unwinding roller located at the lower side of the outer tube of the film forming machine, and then sent to the stretching processing chamber for biaxial stretching and heat treatment; the film on the unwinding roller sequentially bypasses the front stretching roller group and stretches The roller in the heat treatment chamber, the expansion roller, and the hot stretching roller in the humidity control chamber; the hot stretching temperature is 150 to 250 ° C, the hot stretching time is 10 to 60 seconds, and the humidification amount is 150 to 2500 g. / m 3 treatment space volume; (5) humidity control
  • the film after stretching and heat treatment enters the humidity control chamber to adjust the water content, and the humidification amount is 100 ⁇ 2500 g/ m3 of the treatment space volume, so that the film passes 10 to 60 seconds in an environment with a relative humidity of 100%; (6) Winding
  • the film After the film is wound up, it is matured and packaged; the curing temperature is 30-40 ° C, and the ripening relative humidity is 40 ⁇ 80%, curing time is 24 ⁇ 36 hours.
  • the production efficiency can be increased by 15 to 30%, the surface of the finished polyvinyl alcohol film produced is flat, the transparency, the light transmittance and the smoothness are greatly improved, and the current market is available.
  • the use of advanced cellophane is comparable.
  • the apparatus of the present invention is used to produce polyvinyl alcohol films, and other similar films can also be produced. Since an external evaporation device for evaporating the polyvinyl alcohol film is provided outside the film forming machine, the internal heating device and the external evaporation device are used for double heating, and a large amount of heat is simultaneously applied to the outer cylinder to make the outer surface of the polyethylene. The moisture in the alcohol film evaporates quickly, so the apparatus of the present invention greatly increases the production efficiency.

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Moulding By Coating Moulds (AREA)

Description

滚筒法生产聚乙烯醇膜的设备 技术领域
本发明涉及一种生产聚乙烯醇膜的设备， 特别是一种能够大幅度提高生 产效率的滚筒法生产聚乙烯醇膜的设备。 背景技术
授权公告号为 CN1226124C 的发明专利公开了一种聚乙烯醇膜的生 产方法及设备。其中设备的结构如图 1所示，包括顺序排列的下列组成部 分： 用于制备聚乙烯醇水溶液的溶解釜 1、 脱泡罐 4、 成膜机 32、 揭膜辊 16、 前拉伸辊组 6及设置在热处理室 33内的托辊 7、扩幅辊组 8、热拉伸 辊组 9和卷膜摩擦辊 11，在成膜机 32的下方设置有供液槽 17。使用该设 备的生产方法包括如下步骤：在溶解釜 1内制备聚乙烯醇水溶液；在脱泡 罐 4脱泡； 在成膜机 32上成膜； 改性； 调湿； 收卷。 参见图 1。 在溶解 釜 1内的聚乙烯醇水溶液通过管路进入脱泡罐 4，脱泡后由进料管进入供 液槽 17; 成膜机启动， 外筒 22转动， 浸在供液槽 17内的部分外筒蘸取 聚乙烯醇水溶液，在内加热装置的作用下，贴在外筒外表面的聚乙烯醇水 溶液中的水分不断蒸发而形成聚乙烯醇皮膜； 然后在揭膜辊 16作用下， 聚乙烯醇皮膜从外筒上剥离下来； 再经过前拉伸辊组 6改性；在热处理室 33内调湿； 最终收卷。
如图 2所示， 其中成膜机 32的结构包括： 同轴套装设置的外筒 22、 内 筒 23以及内加热装置。 内、 外筒之间的部分为水套 30。 其中内筒 23上固定 有空心前轴 2和空心后轴 3， 前、 后轴固定在内筒支架 27上。 外筒 22通过 轴承可转动地支承在前、后轴上。 内加热装置用于给水套 30加热， 结构包括 加热管 29和溢流管 24。 加热管 29由位于空心前轴 2内的水平部分、 贴在内 筒 23内前侧壁的竖直部分和贴在内筒 23内圆周底壁的水平部分组成。 其中 贴在内筒 23内圆周底壁部分的加热管 29与内筒 23圆周底壁之间设有若干通 孔 45。 溢流管 24由位于空心后轴 3内的水平部分、 贴在内筒 23内后侧壁的 竖直部分和贴在内筒 23内圆周顶壁的水平部分组成。 其中贴在内筒 23内圆 周顶壁部分的溢流管 24与内筒 23圆周顶壁之间设有若干通孔 45。
聚乙烯醇水溶液在成膜机 32的成膜加热过程为： 先从溢流管 24的溢流 出口 47用泵将水泵入水套 30中； 水套内充满水后， 向加热管 29内通入低压 饱和蒸汽， 用来给水套加热， 进一步给外筒 22加热， 使贴在外筒 22外表面 的聚乙烯醇膜中的水分蒸发； 随着蒸汽不断冷凝， 水套 30中的水为断增加， 增加的水由溢流管 24排出。
使用这种传统的生产聚乙烯醇膜的设备能成功地生产出聚乙烯醇膜， 但 该设备， 特别是其中的成膜机具有如下缺陷：
一、 该种成膜机中， 由于仅由内加热装置对外筒加热， 提供的热量少， 致使贴在外筒上聚乙烯醇膜中的水分蒸发慢，成膜时间长，所以生产效率低。
二、 在这种传统的成膜机中， 由于是通过加热管 29来加热水套 30， 那么在水套中，距离加热管 29近的区域温度高，在距离加热管 29远的区 域温度低。 由于在蒸汽沿着加热管路 29流动过程中，沿途也有热量损失， 所以即使在距离加热管 29同样距离的区域， 温度也有差别。 具体来说， 在靠近加热管 29的竖直部分的水套温度要高于靠近内筒 23圆周底壁水套 温度。更进一步地， 同在靠近内筒 23圆周底壁区域， 沿着内筒 23轴向由 前端至后端水套温度也是逐渐降低的。 总之， 现有的这种成膜机， 热量在 其外筒上的分布是极其不均匀的，直接导致的后果就是，贴在外筒上聚乙 烯醇膜中的水分蒸发不均匀， 即生产的聚乙烯醇膜中各部分，特别是沿膜 宽度方向的含水量不同， 严重影响了成品膜的质量。
三、 这种传统的成膜机中， 溢流水管 24和加热管 29均设置在内筒 23内， 这样就需要在内筒 23的圆周壁与溢流水管 24、 加热管 29的相应 水平部分之间设有若干通孔 45。 无论是先打孔再对正安装， 还是先安装 然后再打孔都是非常麻烦的， 消耗大量的人力、 物力资源。
四、使用该种设备，成膜机成膜时采用回转外筒蘸取供液槽中溶液的 方式，这样供液槽的槽口必须保证足够大的尺寸，于是供液槽中的溶液液 面暴露在空气中的面积很大，很容易导致在溶液表面结成皮膜。这种皮膜 严重影响工艺的连续性， 实际生产过程中经常需要停机清理，否则会严重 降低成品率。还有， 这种适用于蘸液成膜法的设备， 由于液体表面张力的 原因， 成膜厚度只能控制在 25微米以下， 成品膜品种单一。
五、 现有的成膜机中， 外筒 22由普通钢材料制成， 为了方便揭膜， 通常 要在外筒 22的外表面设置涂层。不但成本高， 而且在生产过程中， 涂层经常 脱落， 需反复打磨涂抹来修复涂层， 还需经流涎烘烤等处理工艺， 非常麻烦， 误工、 误时， 很难实现连续工业化生产。 发明内容
本发明的实施例旨在克服上述现有技术的不足， 提供一种生产效率高的 滚筒法生产聚乙烯醇膜的设备。
为实现上述目的，本发明的实施例提供了一种滚筒法生产聚乙烯醇膜 的设备，包括成膜机，该成膜机包括固定安装在机架上并具有空心前轴和 空心后轴的内筒、相对内筒可转动的外筒以及内加热装置， 其中内、外筒 之间的部分为水套，其特征在于还包括设置在外筒外面用于将贴在外筒表 面的聚乙烯醇膜中的水分快速蒸干的外蒸干装置。
所述外蒸干装置包括罩在外筒外面具有蒸汽出口的疏风导流罩和均 匀布置在疏风导流罩内的至少两个加热器，疏风导流罩上相对于外筒上贴 有聚乙烯醇膜的部分均匀设置有若干个导风口。
所述疏风导流罩的蒸汽出口处连接有抽风管，抽风管内安装有离心风 机。
所述外筒内壁上均匀布置有若干块划水板。
其中还包括具有出料口的布料管，所述出料口的宽度与外筒的长度相 等，且出料口与外筒之间的间隙相同，在出料口下面的布料管上设有密封 垫。
所述内加热装置包括加热管和溢流管，其中所述前轴伸入到内筒中心 位置，在前轴内设有与热介质源连通的热介质导管。所述加热管呈 "T"形， 其竖直部分与前轴连通，水平部分位于水套内，水平部分设有若干个蒸汽 孔。
所述若干个蒸汽孔呈轴对称分布， 且孔径由中间向两端依次变大。 所述若干个蒸汽孔呈轴对称分布，若干蒸汽孔的孔径相同，密集程度 由中间向两端逐渐变稠密。 所述溢流管呈 "L"形， 其竖直部分与所述后轴连通， 水平部分位于水 套内。
所述前轴和后轴为一体结构，形成一根通轴，在通轴内相应于后轴位 置设有挡板。
所述外筒由不锈钢材料制成。
由上述技术方案可知， 本发明的滚筒法生产聚乙烯醇膜的设备在成膜机 外面设有用于蒸干聚乙烯醇膜的外蒸干装置， 生产时， 采用内加热装置和外 蒸干装置双重加热， 大量热量同时作用于外筒， 使其外表面的聚乙烯醇膜中 的水分快速蒸发， 所以本发明的设备大幅度提高了生产效率。
通过以下参照附图对优选实施例的说明， 本发明的上述以及其它目的、 特征和优点将更加明显。 附图说明
图 1是现有的聚乙烯醇膜生产设备的结构示意图；
图 是现有的聚乙烯醇膜生产设备中的成膜机的结构示意图；
图 3是本发明的用于滚筒法生产聚乙烯醇膜的设备中成膜机的纵向剖视 结构示意图， 为了看清楚内部结构， 拆除了外蒸干装置；
图 4是本发明的用于滚筒法生产聚乙烯醇膜的设备中成膜机的横向剖视 结构示意图。 具体实施方式
下面将详细描述本发明的具体实施例。 应当注意， 这里描述的实施例只 用于举例说明， 并不用于限制本发明。
本发明的用于滚筒法生产聚乙烯醇膜的设备，包括用于制备聚乙烯醇 水溶液的溶解釜、 脱泡罐、 成膜机、 揭膜辊、 前拉伸辊组以及设置在热处 理室内的托辊、扩幅辊组、热拉伸辊组和卷膜摩擦辊。其中除了成膜机和 进料管外， 其他部分与现有技术相同， 不再赘述。
如图 3和图 4所示，本发明设备中的成膜机包括固定安装在机架上的 内筒 23、 相对内筒 23可转动的外筒 22以及内加热装置和外蒸干装置。 外蒸干装置可以采用现有的任何结构， 只要能将贴合在外筒 22外表面的 聚乙烯醇膜中的水分快速蒸干即可。 下面仅给出优选的外蒸干装置结构。 见图 4，外蒸干装置包括罩在外筒 22外面的具有蒸汽出口的疏风导流罩 5 和均匀布置在疏风导流罩 5内的 4个加热器 20， 疏风导流罩 5上相对于 外筒 22均勾设置有若干个导风口 10。 工作时， 来自加热器 20的热量作 用于外筒 22外表面的聚乙烯醇膜上， 使其中的水分快速蒸发出来， 由蒸 汽出口冒出。其中加热器可以选用热风机等， 数量不限于 4个， 可以根据 成膜机的大小适当增加或减少。生产过程中， 由于在成膜机外面设有外蒸 干装置，在成膜机的水套在外筒以内对其加热的同时，外蒸干装置在外筒 外面对其进行蒸干， 大幅度提高了生产效率。 本实施例中的外蒸干装置， 还可以在疏风导流罩 5的蒸汽出口安装抽风管 12，在抽风管 12内安装离 心风机 13。 由蒸汽出口冒出的蒸汽在抽风管 12内再由离心风机 13离心 冷凝成蒸馏水。 离心冷凝 生成的蒸馏水通过引流管流出来。 这样， 在生 产聚乙烯醇膜的同时， 还可以产生大量高价值的蒸馏水。
成膜机中的内筒 23具有空心前轴 2和空心后轴 3， 在前轴 2内设有 与热介质源连通的热介质导管 26， 其中的热介质可以是热蒸汽、 热油、 热风或热水等。 热源可以是电、 油、 气等。 方式可以是传导、 辐射等。 前 轴 ·2端部伸入到内筒 23中心位置。所述内加热装置包括加热管 29和溢流 管 24。 其中加热管 29呈" Τ"形， 竖直部分的一端与前轴 2端部连通， 另 一端穿过内筒 23的圆周壁连接其水平部分； 水平部分置于内、 外筒之间 的水套 30内， 长度与内筒 23长度相等， 水平部分可以与内筒 23可以紧 密贴合在一起， 这样设置相对牢固， 当然也可以相对于内筒 23具有一定 间隙。 本实施例中， 当蒸汽由前轴 2进入后， 沿着" Τ"形加热管 29的竖直 部分进入其水平部分，由于" Τ"形加热管 29的竖直部分位于内筒的中间位 置， 故其向内筒前、后两侧辐射的热量是相同的， 有效改善了热量在轴向 上分布的均匀性。 "Τ"形加热管 29的水平部分设有若干个蒸汽孔 31。 所 述若干个蒸汽孔 31呈轴对称布置，且孔径由中间向两端依次变大。或者， 若干个蒸汽孔 31呈轴对称布置，若干蒸汽孔 31的孔径相同，密集程度由 中间向两端逐渐变稠密。 若干个蒸汽孔 31的上述分布形式进一步改善了 热量在外筒轴向上分布的均匀性。 当然这些蒸汽孔 31也可以是其他的分 布形式。 由于加热管 29的水平部分置于水套 30内， 避免了在内筒 23上 加工通孔以及使加工出的通孔与蒸汽孔对正连通等繁杂工序， 节省了人 力、 物力。
所述溢流管 24呈" L"形，其竖直部分的一端与所述后轴 3连通， 另一 端穿过内筒 23 的圆周壁， 连接其水平部分； 水平部分末端的溢流口 25 位于内筒 23中轴线处， 与" T"形加热管 29的竖直部分对应。 水平部分置 于水套 30内， 可以与内筒 23紧密贴合在一起， 也可以相对于内筒 23具 有一定间隙。
为了加工方便， 所述前轴 2和后轴 3可以是一体结构， 即形成一根空心 通轴， 这时需要在该空心通轴内相应于后轴 3处设置挡板 18， 以保证通入到 加热管 29.的蒸汽能顺利进入水套 30， 而不会直接由该空心通轴通过。
本实施例中， 为了改善外筒温度在其圆周方向均匀分布， 在外筒 22 内壁上均匀设置有若干块呈放射状分布的划水板 14 (见图 4 ) 。 当外筒 22相对于内筒 23转动时， 划水板 14搅动水套 30内的水， 利于加快水套 各部分之间的热传递，从而使水套各部分温度很快达到平衡。有效改善了 热量在外筒圆周方向上分布的均匀性。
由上述可知， 本实施例的成膜机中， 在" T"形加热管 29和划水板 14 的共同作用下，最大程度地改善了热量在外筒轴向及圆周方向分布的均匀 性， 极大地改善了成品膜中含水的均匀度， 提高了成品膜的稳定性。
本实施例中的布料管 15呈管状， 具有一个进料口和一个出料口， 出 料口的宽度与外筒 22的长度相等，出料口沿其宽度方向与外筒 22之间的 间隙相同， 这样利于保证聚乙烯醇膜厚度均匀。 在出料口下面的布料管 15上设有密封垫 19。 布料管 15的进料口可以与脱泡罐 4 (见图 1 ) 直接 连通， 也可以与现有设备中的进料管连接。 由于在生产过程中， 聚乙烯醇 溶液是由布料管 15的出料口流到外筒 22上的， 所以布料管 15的出料口 与外筒 22配合工作的位置， 即聚乙烯醇溶液与成膜机外筒初始接触的位 置在外筒的侧上面或侧下面或上面，这样才能保证聚乙烯醇溶液能够涂布 到外筒上。 生产时， 聚乙烯醇溶液是由布料管 15直接流到成膜机外筒 22 上的。与传统的蘸取聚乙烯醇溶液成膜方式不同，从而避免了聚乙烯醇溶 液结皮误工现象，进一步提高了生产效率。同时使用本发明的设备可生产 厚度 30微米以上的聚乙烯醇膜， 丰富了聚乙烯醇膜的品种。
本实施例中成膜机的外筒 22由密质不锈钢材料制成， 不锈钢表面抛 光至光洁度十一级。这不但在生产过程中揭膜容易，而且提高了成膜质量， 同时利于降低成本。
本发明的滚筒法生产聚乙烯醇膜的方法， 包括如下步骤：
(1)溶解
将聚乙烯醇原料经筛检、水洗溶涨后， 在溶解釜中制备成水溶液； 溶 液重量百分比浓度为 12-45 %， 溶解温度 25〜105°C， 溶解时间 4小时， 搅拌器转速 80〜140rpm， 搅拌器 d = ( 0.6- 1.7) D， D为溶解釜内径；
(2)脱泡
溶解釜内的聚乙烯醇水溶液由出料管流入过滤器，过滤后进入脱泡罐 脱泡； 过滤压力为 0.2〜1.0Mpa， 过滤精度 0.2微米， 脱泡温度为 85〜 95 °C， 亦可采用脱泡剂。
(3)成膜
脱泡结束后的聚乙烯醇水溶液由布料管 15喷涂或涂布到成膜机的外 筒侧上面或侧下面或上面，外筒转动即可在其外表面形成聚乙烯醇膜，在 水套内加热和外蒸干装置外蒸干的同时作用下，聚乙烯醇膜中的水分快速 蒸发掉， 成为皮膜；
(4)改性
皮膜由位于成膜机外筒下侧部的揭膜辊处剥离后，被送入拉伸处理室 进行双向拉伸和热处理；揭膜辊上的膜依次绕过前拉伸辊组、拉伸热处理 室中的托辊、 扩幅辊、 调湿室中的热拉伸辊组； 热拉伸温度为 150〜250 °C，热拉伸时间为 10〜60秒，加湿量为 150〜2500克 /米 3处理空间体积； (5)调湿
经拉伸和热处理后的膜进入调湿室调节含水量，加湿量为 100〜2500 克 /米 3处理空间体积，使膜在相对湿度为 100%的环境中通过 10〜60秒； (6)收卷
将成膜收卷后， 熟化、 包装； 熟化温度 30-40°C， 熟化相对湿度 40〜 80 % , 熟化时间 24〜36小时。
使用本发明的生产聚乙烯醇膜的设备， 生产效率可提高 15〜30 %， 生产出的成品聚乙烯醇膜表面平整，透明度、透光率和光洁度都有大幅度 提高， 可与目前市场上使用的高级玻璃纸媲美。
虽然己参照几个典型实施例描述了本发明，但应当理解，所用的术语 是说明和示例性、而非限制性的术语。由于本发明能够以多种形式具体实 施而不脱离发明的精神或实质，所以应当理解，上述实施例不限于任何前 述的细节，而应在随附权利要求所限定的精神和范围内广泛地解释， 因此 落入权利要求或其等效范围内的全部变化和改型都应为随附权利要求所 涵盖。 工业实用性
本发明的设备用于生产聚乙烯醇膜， 也可生产其他类似的薄膜。 由于在 成膜机外面设有用于蒸干聚乙烯醇膜的外蒸干装置， 生产时采用内加热装置 和外蒸干装置双重加热， 大量热量同时作用于外筒， 使其外表面的聚乙烯醇 膜中的水分快速蒸发， 所以本发明的设备大幅度提高了生产效率。

Claims

权利要求
1.一种滚筒法生产聚乙烯醇膜的设备， 包括成膜机， 该成膜机包括固 定安装在机架上并具有空心前轴 (2)和空心后轴 (3)的内筒 (23)、 相对内筒 (23)可转动的外筒 (22)以及内加热装置， 其中内、 外筒之间的部分为水套 (30), 其特征在于还包括设置在外筒 (22)外面用于将贴在外筒表面的聚乙 烯醇膜中的水分快速蒸干的外蒸干装置。
2.如权利要求 1所述的设备，其特征在于所述外蒸干装置包括罩在外 筒 (22)外面具有蒸汽出口的疏风导流罩 (5)和均匀布置在疏风导流罩 (5)内 的至少两个加热器 (20)，疏风导流罩 (5)上相对于外筒 (22)上贴有聚乙烯醇 膜的部分均匀设置有若干个导风口（10)。
3.如权利要求 2所述的设备， 其特征在于所述疏风导流罩 (5)的蒸汽 出口处连接有抽风管 (12)， 抽风管 (12)内安装有离心风机 (13)。
4.如权利要求 1所述的设备， 其特征在于所述外筒 (22)内壁上均勾布 置有若干块划水板 (14)。
5.如权利要求 1所述的设备，其特征在于还包括具有出料口的布料管
(15), 所述出料口的宽度与外筒 (22)的长度相等， 且出料口与外筒 (22)之 间的间隙相同， 在出料口下面的布料管 (15)上设有密封垫 (19)。
6.如权利要求 1-5之任一项权利要求所述的设备，其特征在于所述内 加热装置包括加热管 (29)和溢流管 (24)， 其中所述前轴 (2)伸入到内筒 (23) 中心位置， 在前轴 (2)内设有与热介质源连通的热介质导管 (26)， 所述加 热管 (29)呈" T"形， 其竖直部分与前轴 (2)连通， 水平部分位于水套 (30)内， 水平部分设有若干个蒸汽孔 (31)。
7.如权利要求 6所述的设备， 其特征在于所述若干个蒸汽孔 (31)呈轴 对称分布， 且孔径由中间向两端依次变大。
8.如权利要求 6所述的设备， 其特征在于所述若干个蒸汽孔 (31)呈轴 对称分布，若干蒸汽孔 (31)的孔径相同，密集程度由中间向两端逐渐变稠 密。
9.如权利要求 6所述的设备， 其特征在于所述溢流管 (24)呈" L"形， 其竖直部分与所述后轴 (3)连通， 水平部分位于水套 (30)内。
. 10.如权利要求 6所述的设备，其特征在于所述前轴 (2)和后轴 (3)为一 体结构， 形成一根通轴， 在通轴内相应于后轴 (3)位置设有挡板 (18)。
11.如权利要求 6所述的设备， 其特征在于所述外筒 (22)由不锈钢材 料制成。
PCT/CN2009/000394 2008-04-14 2009-04-14 滚筒法生产聚乙烯醇膜的设备 WO2009127121A1 (zh)

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