JP2007238145A - Rubber band for packaging and its manufacturing method and film roll package - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To restrain an occurrence of a coating failure on a TAC film packed using a rubber band for packaging. <P>SOLUTION: The content of an inorganic acid metal salt additive 21 to a rubber material 20 is 1 wt.% or more and 5 wt.% or less. Magnesium carbonate is used as the additive 21. A rubber tube 23 is formed by extrusion molding of the rubber material 20. The rubber tube 23 is vulcanized in a vulcanization process 12. After vulcanization, the rubber tube 25 is cooled and washed in a cooling/washing process 13. The rubber tube 28 is cut in a non-end shape in a cutting process 14. The rubber band 31 is washed in the final washing process 15 to remove the additive 21 remained near the surface layer and is dried. Dispersion of the additive 21 in the rubber band 16 at packing or unpacking is prevented and the occurrence of a surface defect such as a cissing failure or the like at coating in the next process caused by the additive 21 can be restrained. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rubber band for packaging, a method for producing the same, and a film roll package using the rubber band for packaging.

  For example, a TAC film (cellulose triacetate film) used for a protective film for a polarizing plate of a liquid crystal display device, an optical compensation film and the like is produced by a solution casting method. This long film is wound into a roll around a winding core to form a film roll. This film roll is covered with a packaging sheet and sent to, for example, a manufacturing facility for a liquid crystal display device. In the manufacturing facility, the packaging is unpacked and the TAC film is coated and used as a protective film or an optical compensation film.

  In manufacturing a TAC film, a film manufacturing facility is installed in a clean room in order to reduce defects such as foreign matter. In the clean room, there are a casting / peeling chamber for performing the casting / peeling process, a drying chamber for performing the drying process, a winding chamber for performing the winding process, a packing room, etc., and each room is higher than the clean room. Clean air is supplied (see, for example, Patent Document 1).

In addition, the side edges of the packaging sheet that wraps the film roll are in close contact with the winding core, and a rubber band is hung on the adhesion part or a hooked overband is attached to the both sides of the packaging sheet. Intrusion of dust and moisture is prevented (see Patent Document 2).
JP 2004-106266 A (see paragraph 5) Japanese Patent Laid-Open No. 2001-106435 (see paragraph 6, paragraph 45, FIG. 6)

  As mentioned in Patent Document 2, it is known that a deteriorated rubber band causes dust generation. Avoid using a rubber band so that foreign matter failure caused by dust generation does not occur. Thus, a packaging sheet fixing member such as a hooked band or a string made of a material that generates little dust has been used. However, since these packaging sheet fixing members require a hooking operation and a binding operation, there is a problem that the packaging work requires time and use of a rubber band that is easy to fix is required.

  By the way, in addition to the generation of foreign matter due to deterioration of the rubber band, any powder of silica, mica, talc, clay, calcium carbonate, magnesium carbonate or the like is used so that the rubber does not adhere to each other even in the new stage. This powder is known to cause foreign matter failure. Moreover, when removing and using powder by washing | cleaning etc., the removal operation | work of powder is required and there exists a problem that the ease of handling of a rubber band will be impaired.

  Therefore, as a result of various experiments on foreign matter failure caused by rubber band deposits and additives, even if the adhering powder is removed by washing, etc., it is possible to improve the releasability at the rubber band manufacturing stage. Therefore, it was possible to ascertain that the release additives such as magnesium carbonate and magnesium silicate kneaded into the rubber cause foreign matter failure. In other words, if the band itself is stretched and operated to fix the packaging sheet to the core with a rubber band, the additive may be peeled off from the surface during the expansion and contraction. It has been found that it appears as a repellency failure in the coating process and the like, causing a product defect.

  Judging from such knowledge, it is preferable to reduce the release additive. However, if the amount of the additive is reduced, there arises a problem that it becomes impossible to smoothly remove the rubber tube from the mold in the manufacturing stage.

  The present invention has been made in view of the circumstances as described above, and balances the mixing amount of the release additive that causes foreign matter failure and the releasability, and the release agent is used when the band itself expands and contracts. It is an object of the present invention to provide a rubber band for packaging, a method for producing the same, and a film roll package that are prevented from scattering from the surface.

  In order to achieve the above object, the rubber band for packaging according to the present invention is characterized in that the additive content of the inorganic acid metal salt is 1% by weight or more and 5% by weight or less based on the rubber material. The additive is either magnesium carbonate or magnesium silicate. The packaging rubber band is washed.

  Further, the present invention provides a film roll obtained by winding a long film around a peripheral surface excluding both ends of a winding core, a packaging sheet covering the film roll, and both side edges of the packaging sheet that wraps the film roll. In a film roll package having a packaging rubber band fixed to both ends of a winding core, a packaging rubber band having an inorganic acid metal salt additive content of 1% by weight to 5% by weight with respect to the rubber material It is characterized by using.

  In the method for producing a rubber band for packaging according to the present invention, a process for forming a rubber band for packaging by adding an additive composed of 1% by weight or more and 5% by weight or less of an inorganic acid metal salt to the rubber material; And a step of cleaning the rubber band.

  According to the rubber band for packaging of the present invention, the additive content of the inorganic acid metal salt is 1% by weight or more and 5% by weight or less with respect to the rubber material, so that the mold release property at the time of manufacture is secured and the packaging is performed. When used as a rubber band for an automobile, the additive is prevented from scattering from the rubber band as dust. Therefore, even in a clean room with a high cleanliness, the additive does not scatter and the occurrence of foreign matter failure due to the additive is suppressed. In particular, since the rubber band has been subjected to the cleaning treatment, the scattering of the additive can be further suppressed in combination with a configuration with a small amount of additive.

  Further, a film roll formed by winding a long film around a peripheral surface excluding both ends of the winding core, a packaging sheet covering the film roll, and both side edges of the packaging sheet wrapping the film roll are connected to both ends of the winding core. In the film roll package having the packaging rubber band fixed to the part, the use of the rubber band of the present invention as the packaging rubber band reduces the scattering of the additive. Therefore, in the next coating process or the like, occurrence of planar defects such as repelling failure due to the adhesion of the additive can be suppressed.

  FIG. 1 shows a manufacturing process of the rubber band for packaging according to the present invention. The manufacturing process of the present invention includes an extrusion molding process 11, a vulcanization process 12, a cooling / cleaning process 13, a cutting process 14, and a final cleaning process 15. Through these processes 11 to 15, an endless rubber band 16 is formed. Is manufactured.

  In the extrusion molding step 11, a rubber material 20 such as natural rubber mixed with an additive 21 made of 3.5 wt% magnesium carbonate is extruded into a tube shape by an extrusion molding machine 22, and the rubber tube 23 is formed. Form. As the additive 21, magnesium carbonate having primary particle size of 30 nm to 200 nm is used.

  The additive amount of the rubber material is 1% by weight or more and 5% by weight or less. When the additive amount is less than 1% by weight, the peelability from the mold during extrusion molding is lowered, and the rubbers are bonded to each other after the product. Moreover, when the addition amount of an additive exceeds 5 weight%, there exists a problem that a foreign material will generate | occur | produce. The amount of the additive added to the rubber material is more preferably 2% by weight or more and 3.5% by weight or less. The particle size of the primary particles of the additive is preferably 30 nm to 100 nm. As the additive, a general additive may be used. In addition to magnesium carbonate, magnesium silicate is preferably used, and a mixture thereof may be used.

  In the vulcanization step 12, the rubber tube 23 extruded from the extrusion molding machine 22 is immersed in the hot bath 24 and vulcanized. The hot tub 24 is filled with, for example, salt salt solution. The rubber tube 25 vulcanized and molded by the hot tub 24 is sent to the next cooling / cleaning step 13.

  In the cooling / cleaning step 13, the rubber tube 25 is passed through the cooling tank 26 and the cleaning tank 27 in order, and cooling and washing of the salt solution are performed.

  The cleaned rubber tube 28 is sent to the cutting step 14. In the cutting step 14, the rubber tube 28 is first crushed by the conveying roller pair 29 and then sent to the cutter 30. The cutter 30 cuts the rubber tube 28 in the width direction to form an annular rubber band 31.

  In the final cleaning step 15, the annular rubber band 31 is immersed in the final cleaning tank 32 to clean the surface. By this cleaning, the additive 21 adhering to the surface or the additive 21 exposed from the surface layer is removed. As the cleaning liquid, tap water (ordinary water) mixed with a detergent is used. In addition, you may add the rinse process by a pure water in the last process of washing | cleaning. The detergent is not particularly limited, but it is preferable to use a neutral detergent. In addition, it is preferable to circulate the cleaning liquid in the cleaning tank 32, whereby the cleaning can be performed efficiently. Furthermore, it is preferable that a plurality of cleaning tanks 32 are provided, and rough cleaning and finish cleaning are sequentially performed in the plurality of cleaning tanks. The washing tank 32 is preferably provided with a stirrer. Further, the rubber band 31 may be washed using a household washing machine instead of the washing tub 32.

  The washed rubber band 31 is naturally dried to form the packaging rubber band 16 of the present invention. The packaging rubber band 16 is packaged as needed and used for packaging film rolls. Note that drying after washing may be forced drying with warm air instead of natural drying. Further, although the final cleaning process 15 is incorporated in the final process of the rubber band manufacturing process, the final cleaning process 15 may be omitted in the manufacturing stage and before use. Moreover, you may perform both the last washing | cleaning process 15 in a manufacture stage, and the washing | cleaning process before use.

  In addition, the manufacturing method of a rubber band is not limited to said embodiment, You may manufacture with various methods. Also in this case, the addition amount of the additive 21 with respect to the rubber material 20 is set to 1% by weight or more and 5% by weight or less, and the rubber band 31 is washed at the final stage.

  Next, with reference to FIG. 2, the film roll package 40 using the rubber band 16 for packaging of this invention is demonstrated. In the final step of the solution casting equipment, the long TAC film 41 is wound around the winding core 42 to become a film roll 43. The film width is shortened with respect to the entire length of the winding core 42, and portions where the film 41 is not wound are formed at both end portions 42 a of the winding core 42. For example, a packaging sheet 44 made of vinyl chloride is wound around the film roll 43. And the both ends are squeezed and it is closely_contact | adhered to the film roll both side surfaces 43a and the winding core both ends 42a. The packaging rubber band 16 according to the present invention is attached to a portion where the packaging sheet 44 of the both ends 42a of the core is indented and brought into close contact with the core 42. These packaging operations are performed in a clean room. One or a plurality of rubber bands 16 may be used. Further, one rubber band 16 may be used in a double, triple or other multiple.

  The film roll package 40 in which the packaging sheet 44 is fixed to both ends 42a of the core with the rubber band 16 for packaging is placed in a state in which both ends 42a of the core are held on a roll base (not shown). Then, if necessary, the film roll packaging pair 40 and the roll cradle are further packaged by a packaging sheet, and the next manufacturing process, for example, manufacturing a polarizing plate protective film for a liquid crystal display device, by means of transportation such as a truck or a container Sent to the facility.

  In the polarizing plate protective film manufacturing facility, a predetermined liquid is applied to the TAC film 41. In this coating step, in the film roll packaging body 40 of the present invention, the additive 21 of the rubber band 16 for packaging is suppressed to a predetermined range of addition amount, and the additive 21 on the surface layer is washed in the final washing step 15. Therefore, even if the rubber band 16 is used as a packaging sheet fixing member of the film roll 43, the additive 21 is not separated from the rubber band 16 and scattered, and the additive 21 is not applied in the next coating step. Can be prevented from adhering to the front and back surfaces of the TAC film 41 and repelling the coating liquid.

[Example 1]
In Example 1, a rubber material 20 in which 3.5% by weight of magnesium carbonate having an average primary particle size of 50 nm was mixed as a release additive 21 was manufactured by a manufacturing process as shown in FIG. . In the final cleaning step 15, the film roll package 40 was configured using the rubber band 16 after being washed for 60 minutes using a neutral detergent cleaning solution. The packaging of the film roll package 40 was unwound, a coating solution was applied using the TAC film 41, and the presence or absence of point defects due to cissing failures was measured with a defect inspection apparatus. In addition, a 1 kg rubber band 16 is inserted into a vinyl bag, and a light scattering type automatic particle counter (Lion Handheld Partical Counter (KR-12A)) is placed in the vinyl bag to shake the vinyl bag. The degree of dust in the vinyl bag was measured in a state where the rubber band was squeezed from the top of the vinyl bag to promote the peeling of the additive. In the present embodiment, the number of particles having a particle size of 1 μm or more was measured by the particle counter. The measurement was performed 5 times, and the data of 1 and 2 times were not used, and the average data of 3 to 5 times was used.

[Comparative Example 1]
A film roll package was constructed using a general rubber band that was not subjected to the final cleaning step of Example 1, and the coating solution was applied under the same conditions as in Example 1 to measure the presence or absence of point defects. Further, the number of particles having a particle size of 1 μm or more under the same conditions as in Example 1 was measured by the particle counter.

  In Example 1, the presence or absence of point defects was 0 to 5 per 10 m in the film conveyance direction, and was in a range having no practical problem. On the other hand, in Comparative Example 1, the number of point defects was 30 or more per 10 m, and a cissing failure caused by the additive occurred and could not be used as a product. In the dust measurement, 21 pieces were detected in 1 CF (cubic feet) in Example 1, whereas 577 pieces of about 30 times in 1 CF were detected in Comparative Example 1. As described above, a dust degree measurement result showing the same tendency as the measurement of the point defect failure after the actual application was obtained. Therefore, it turns out that this invention is effective in suppression of a repellency failure etc.

It is the schematic which shows the manufacturing process of the rubber band for packaging of this invention. It is the schematic which shows the packaging process of the film roll package of this invention in order.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Extrusion process 12 Vulcanization process 13 Cooling and washing process 14 Cutting process 15 Final washing process 16 Rubber band 20 Rubber material 21 Additive 22 Extruder 23 Rubber tube 24 Hot tub 25 Vulcanized rubber tube 26 Cooling tank 27 Washing tank 28 Washed rubber tube 30 Cutter 31 Annular rubber band 32 Washing tank 40 Film roll package 41 TAC film 42 Core 43 Film roll 44 Packaging sheet

Claims (5)

  A rubber band for packaging, characterized in that the additive content of the inorganic acid metal salt is from 1% by weight to 5% by weight with respect to the rubber material.   The rubber band for packaging according to claim 1, wherein the additive is magnesium carbonate or magnesium silicate.   The packaging rubber band according to claim 1 or 2, wherein the packaging rubber band is washed. A film roll formed by winding a long film around the peripheral surface excluding both ends of the winding core, a packaging sheet covering the film roll, and both side edges of the packaging sheet wrapping the film roll at both ends of the winding core In a film roll package having a packaging rubber band to be fixed,
A film roll package comprising the rubber band for packaging according to any one of claims 1 to 3. A step of forming a rubber band for packaging by adding an additive composed of 1 to 5% by weight of an inorganic acid metal salt to the rubber material;
And a step of cleaning the packaging rubber band. A method for producing a packaging rubber band.

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