JP2009155758A - Method for producing glassine paper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing glassine paper, capable of subjecting glassine paper to a supercalender without reheating, in view of the fact that, glassine paper may be produced by being subjected to a supercalender under high-temperature and high-pressure, wherein paper made by papermaking process is rehumidified for supercalendering using a damping apparatus; however, the above paper has been dried once, resulting in energy waste. <P>SOLUTION: A humidifier 15 is installed on a group of dryers 41 of a dry part 4, and web paper under traveling is sprayed with water to be humidified. The moisture content of the paper produced by passing through the dry part 4 is adjusted to a level suitable for subjecting the paper to a supercaleder 10 for producing the glassine paper, thus ensuring the paper to be subjected to the supercalender 10 without rehumidification. The humidifier 15 adjusts, based on data obtained by a BM meter 7, the water-spray level by a cross-direction moisture controller in the cross direction of web paper to uniformize the moisture content of the web paper. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for producing glassine paper having transparency, which is used, for example, for a window portion of an envelope with a window, packaging of a dispensing drug, release paper, and the like.

  Glassine paper is a semi-transparent paper, such as tracing paper. Paper made from raw material that has been highly beaten in the pretreatment process is subjected to high temperature and high pressure using a super calendar. Therefore, transparency is improved by improving smoothness.

  FIG. 2 explains the papermaking process of glassine paper, and shows a case using a long net paper machine. The papermaking raw material supplied from the stock inlet 1 to the wire part 2 is formed into a sheet-like paper web, and the press part 3 squeezes the water content to approximately 67% by weight. It is dried by running while being wound around the dryer cylinder 4a in the dry part 4, and at the outlet of the dry part 4, a paper sheet adjusted to a moisture content of 3.0 to 4.5% by weight is obtained. Next, the calender 5 is crushed to give smoothness, the defect detector 6 is passed to detect defects such as the presence or absence of small holes, and the BM meter 7 is passed to determine the moisture content. Is detected and whether or not it is wound around the paw reel 8 to complete the winding P.

  The paper wound around the paw reel 8 is transported by a transport device or the like and supplied to the damping device 9. The damping device 9 sprays water while rewinding the winding P to increase the moisture content to about 22% by weight. While rewinding the winding P, it is subjected to high temperature and high pressure with a super calender 10 to improve smoothness and to provide transparency, and to lower the moisture content to approximately 5.5% by weight. Tori G is completed. This winding G is supplied to the winder 11 and the wound winding G is supplied to the packaging process.

  Further, Patent Document 1 includes two or more metal rolls, and at least one metal roll is applied to a nip portion heated to a surface temperature of 80 to 200 ° C. under a pressure condition of 100 kg / cm or more. A method for producing glassine paper by drawing a sheet and performing a high smoothing treatment is disclosed. Patent Document 2 discloses a glassine paper manufacturing method in which a coating composition containing a water-soluble polymer as a main component is coated on a base paper and then finished by high-temperature and high-pressure treatment. A method for producing glassine paper is disclosed in which the moisture of the base paper at the time of coating is specified to be 15 to 30% by weight.

Japanese Patent No. 2886336 JP 7-60905 A

  The manufacturing method disclosed in Patent Document 1 has a configuration on the premise that metal rolls are continuously arranged on a paper machine. Further, the glassine paper produced by the method disclosed in Patent Document 2 is used particularly for release paper, and relates to a production method that prevents the release agent from penetrating into the glassine paper.

  By the way, in the above-described conventional manufacturing method, the winding P manufactured by the paper machine and having a moisture content of 3.0 to 4.5% by weight is humidified to the winding P by using the damping device 9. The water content is increased to 22% by weight. That is, the paper whose moisture content has been reduced from 67 wt% to 3.0 to 4.5 wt% by passing through the dry part 4 is humidified again. For this reason, a part of the steam supplied to dry the paper to the dry part 4 is wasted, and the operation is uneconomical in terms of energy.

  Accordingly, an object of the present invention is to provide a method for producing glassine paper that improves the energy efficiency during papermaking and does not deteriorate the quality.

  As a technical means for achieving the above object, the glassine paper manufacturing method according to the present invention is characterized in that a paper roll manufactured by a paper machine is subjected to a super calender at high temperature and high pressure to increase smoothness. In the method for producing glassine paper produced by imparting transparency, a humidifier is disposed in the dry part of the paper machine, water is sprayed onto a paper sheet passing through the humidifier, and the paper machine produces paper. The moisture content of the paper is adjusted to a desired value, and a paper sheet having the desired moisture content is provided to the super calendar.

  The moisture content of the paper made by humidifying the paper web in the dry part is set to a value suitable for producing glassine paper. When passing through the dry part, the moisture content is adjusted by spraying water from the humidifier onto the paper web so that the moisture content of the paper made is suitable for producing glassine paper. That is, the glassine paper is produced by directly applying the paper whose moisture content is adjusted to the super calendar. For this reason, the conventional damping device becomes unnecessary.

  The glassine paper manufacturing method according to the invention of claim 2 is characterized in that the humidifying device includes a width direction moisture control device and uniformly humidifies the width of the paper web.

  The amount of water sprayed by the humidifier is controlled by the width direction moisture control device, and the moisture content is made uniform in the width direction of the web. The moisture content is detected by a BM meter or the like that is installed at the end of the paper machine and measures the paper made.

  The glassine paper manufacturing method according to the invention of claim 3 is characterized in that the moisture content of the paper sheet used for the supercalender is 20 to 22% by weight.

  When the super calender is used under high temperature and high pressure, the moisture content of the paper made by the paper machine is adjusted so that the moisture content is about 22% by weight, which is suitable for glassine paper. It is. This adjustment is performed by changing the amount of water jetted by the humidifier and the temperature of the steam supplied to the dryer cylinder. In particular, by providing the humidifier with a width direction moisture control device, the moisture content of the web can be stabilized, and the steam supplied to the dryer cylinder can be stabilized.

  The glassine paper manufacturing method according to the invention of claim 4 is characterized in that the humidifier is disposed in a dryer group that is a part of the dry part and follows the press part.

  In the dry part of the paper machine, a plurality of groups each having a plurality of dryer cylinders are continuously arranged depending on the steam system to be supplied. A drier group including a plurality of drier cylinders such as a first group drier, a second group drier, a third group drier, and the like is continuous from the upstream side in the traveling direction of the web, that is, from the press part side. The humidifier is arranged in the dryer group following the press part in the plurality of groups, that is, in the portion of the first group dryer. The humidifier may be placed in any position as long as it is a dry part, but in order to adjust the moisture content to a desired level, it can be placed in the upstream dryer group so that It is preferable because the dry state can be easily controlled.

  According to the glassine paper manufacturing method of the present invention, a damping device for rehumidifying the paper made is not necessary, and the amount of steam supplied to the dryer cylinder in the dry part can be reduced. Thereby, energy reduction in the process of manufacturing glassine paper can be achieved.

  According to the glassine paper manufacturing method of the second aspect of the invention, the moisture content of the paper to be used for the supercalender can be stabilized, and the quality of the glassine paper to be manufactured is improved and stabilized. And the yield can be improved.

  According to the method for producing glassine paper according to the invention of claim 3, it is possible to improve the efficiency of production with a super calendar and to produce glassine paper with stable quality.

  Moreover, according to the glassine paper manufacturing method of the invention of claim 4, paper having a moisture content of a desired value can be reliably made, and the energy efficiency in the dry part can be made the best. .

  The glassine paper manufacturing method according to the present invention will be specifically described below based on the preferred embodiments shown in the drawings.

  FIG. 1 shows steps for carrying out the glassine paper manufacturing method according to the present invention. In addition, the same code | symbol is attached | subjected about the site | part similar to the conventional structure shown in FIG. In the dry part 4, the first group dryer 41, the second group dryer 42, and the third group dryer 43 are sequentially arranged from the upstream side in the running direction of the web, that is, the press part 3 side. A humidifier 15 is disposed in part. In the humidifier 15, a plurality of nozzles (not shown) are arranged at appropriate intervals in the paper width direction, which is a direction perpendicular to the traveling direction of the paper machine, and the nozzles are wound around the dryer cylinder 4a to travel. Water is sprayed on the paper web to moisten the web.

  At the most downstream side of the paper machine, there is provided a pawrel 8 for winding a paper web to form a take-up P, and immediately before that a BM meter 7 for measuring the moisture content of the paper web is provided. Based on the moisture content of the paper detected by the BM meter 7, there is provided a width direction moisture control device (not shown) for adjusting the water injection amount from the humidifying device 15.

  The take-up P formed by being wound around the paw reel 8 is conveyed to the frame rotating device 16. In this frame rotating device 16, a seasoning process such as applying a polymer composition is performed as necessary, for example, in the case of producing glassine paper suitable for release paper.

  The winding P is subjected to a super calender 10 and is processed under high temperature and high pressure to increase smoothness and improve transparency, thereby completing the winding G of glassine paper. The completed winding G is supplied to the winder 11 to be rewound, conveyed to the winding and packaging process, and packaged for shipping.

  In the glassine paper manufacturing method described above, the paper web running on the dry part 4 is humidified by the humidifier 15. The moisture content at this time and the dry amount in the dry part 4 are adjusted, and the moisture content of the paper roll wound up by the papoll 8 is adjusted to about 22% by weight. Therefore, as in the conventional glassine paper manufacturing method, the paper that has been made can be used for the super calendar 10 without being humidified again by being supplied to the damping device 9.

  The moisture content of the paper thus produced is detected by the BM meter 7 and transmitted from the stock inlet 1 of the paper machine to each device of the dry part 4 to adjust the moisture content in each processing step. In particular, it is transmitted to the humidifier 15 through a width direction moisture control device (not shown) so that the moisture content is uniform along the width direction of the web, that is, the direction perpendicular to the flow direction of the paper machine, The amount of water sprayed from the humidifier 15 is adjusted along the width direction.

  According to the method for producing glassine paper according to the present invention, the moisture content of the paper produced is set to an appropriate value for use in a supercalender for producing glassine paper. Therefore, it is possible to reduce the steam supplied to the dryer cylinder by eliminating the need for a dampening device for rehumidification and eliminating the need for drying until the moisture content is reduced in the dry part. It can contribute to reduction.

It is a figure explaining the manufacturing process for enforcing the manufacturing method of glassine paper concerning this invention, and shows what is manufactured by using glassine paper for a super calendar. It is a figure explaining the conventional manufacturing process which uses paper-made paper for a super calendar and manufactures glassine paper.

Explanation of symbols

1 Stock inlet 2 Wire part 3 Press part 4 Dry part
4a Dryer cylinder 5 Calendar 6 Defect detector 7 BM meter 8 Poplar
10 Super calendar
11 Winder
15 Humidifier
16 Frame rotation device P Winding G Winding of glassine paper

Claims (4)

In the method for producing glassine paper, which is produced by providing a paper roll produced by a paper machine to a super calender under high temperature and high pressure to increase smoothness and impart transparency.
A humidifier is disposed in the dry part of the paper machine, water is sprayed onto a paper sheet passing through the humidifier, and the moisture content of the paper produced by the paper machine is adjusted to a desired value.
A method for producing glassine paper, characterized in that a paper sheet having a desired moisture content is provided to the super calendar.   2. The glassine paper manufacturing method according to claim 1, wherein the humidifying device includes a width direction moisture control device, and uniformly humidifies the width of the web.   3. The glassine paper manufacturing method according to claim 1, wherein a moisture content of a paper sheet provided for the super calendar is 20 to 22% by weight. 4.   The method for producing glassine paper according to any one of claims 1 to 3, wherein the humidifier is disposed in a dryer group that is a part of the dry part and follows the press part.

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