JP2009235308A - Sealing tape with reinforcing thread - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing tape with reinforcing thread with which a trouble of peeling off from a bonded surface scarcely occurs, considering the fact that water-soluble thread has been used as reinforcing thread for a conventionally used sealing tape with reinforcing thread, however, owing to poor dimensional stability of the water-soluble thread against moisture, the trouble of peeling off from the bonded surface has frequently been occurring during storage or after use of the product. <P>SOLUTION: Blended yarns composed of a water-soluble staple fiber and a cellulose-based natural fiber or a cellulose-based regenerated staple fiber are disposed between a sheet of upper paper and a sheet of lower paper as warp yarns and weft yarns, or a sheet of fabric composed of the blend yarn is disposed in between. The bonded article made by bonding the upper paper and the lower paper with a water-soluble or water-dispersed adhesive is used as a base material for the sealing tape. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a gummed tape with reinforcing yarn, and more particularly to a gummed tape with good water dispersibility and excellent dimensional stability.

  Conventionally, paper is used as the base material for the gum tape, but the paper alone has low strength, and in applications where strength is required, paper containing yarn reinforced with reinforcing yarn is used as the base material.

Also, when packing materials such as cardboard are used as raw materials for the purpose of recycling resources, when the cardboard material is not dissolved in water or alkaline solution when attempting to dissolve and reuse the cardboard, the gummed tape must be removed. I had to put it in the beating tank. Therefore, attempts have been made to save such time and to dissolve the gummed tape together and use it as a resource.
Japanese Patent No. 3087775

  As described above, if the gummed tape material is soluble in water or an alkaline solution, there is an effect that labor can be saved because it can be put into the beating tank without peeling the tape from the cardboard. However, when a water-soluble yarn is used as a reinforcing yarn for a gum tape, the water-soluble yarn has a drawback that it shrinks due to the presence of moisture and the entire tape shrinks. When the tape shrinks, attention must be paid to the humidity control during storage of the tape, and the shape of the joining surface of the tape and the corrugated cardboard collapses or the phenomenon of peeling of the tape occurs.

  As a result of earnest research to obtain a gum tape material containing a reinforcing yarn that is not easily affected by moisture and is likely to fall apart in water or an alkaline solution, the present inventors have found that the warp yarn and the horizontal yarn constituting the reinforcing yarn are water-soluble. It has been found that by using a blended yarn composed of yarn and cellulosic fibers, and using a mesh product or woven fabric in which the blended yarn is arranged as a warp yarn or a weft yarn, a desired gum tape material can be obtained. completed.

  That is, the gist of the present invention is that a blended yarn composed of a water-soluble staple and a cellulose-based natural fiber or a cellulose-based regenerated fiber staple is disposed between the upper paper and the lower paper as a warp yarn and a weft yarn. Or a plain weave fabric is used, and a water-soluble or water-dispersible adhesive is used as the adhesive for bonding the upper and lower papers to form a base material for the gum tape. The present invention is a gummed tape with a reinforcing yarn, characterized in that a rewetable adhesive layer is provided on the adhesive tape.

  According to the present invention, compared to a gum tape reinforced with a yarn made of only water-soluble yarns, it has superior dimensional stability against moisture, so there are few troubles during storage, and even when used as a packaging material, the tape shrinks. A gummed tape that is less likely to peel off at the joint surface is obtained.

  The present invention is described in detail below. The gum tape as used in the field of this invention is the paper tape which provided the rewet adhesive layer on the single side normally used. Since the strength of the tape is weak, a reinforcing thread is often used. Ordinary natural fibers, regenerated fibers, and synthetic fibers are used as the reinforcing yarns. Gum tapes using these reinforcing yarns have sufficient strength and excellent dimensional stability against moisture, but cannot be reused as resources.

  That is, when such a gum tape is used as a packaging material for packaging cardboard, the gum tape does not dissolve in water or alkaline solution, so it is troublesome that the gum tape must be peeled off from the used cardboard and then put into the beating tank. It was only after work that cardboard could be used as a resource.

  Thus, a gum tape reinforced with water-soluble yarn was conceived. If this gum tape was used, it was put into the beating tank as it was without peeling the gum tape from the used cardboard, and it became possible to use it as a resource. However, the water-soluble yarn has poor dimensional stability against moisture, causing a phenomenon that the tape contracts, and troubles during storage and a phenomenon that the tape is peeled off at the joint surface with the cardboard.

  The gummed tape of the present invention solves all the above problems. In the present invention, a blended yarn of water-soluble staples and cellulosic fiber staples is used as the reinforcing fabric. As the water-soluble yarn staple used in the present invention, a yarn that dissolves at a temperature of 80 ° C. or lower, preferably 50 ° C. or lower is used. Namely, what is necessary is just to melt | dissolve at the beating process temperature. Low saponified polyvinyl alcohol fibers, carboxymethyl cellulose fibers, cationic dyeable polyester fibers, alginic acid fibers, and the like can be mentioned. Among them, industrially produced low saponified polyvinyl alcohol fibers are preferably used. The saponification degree of polyvinyl alcohol as a raw material of the fiber is preferably 80 mol% or more and 97 mol% or less. The low saponified polyvinyl alcohol is formed into a yarn by a method such as a normal wet spinning method, a semi-melt spinning method, or a dry spinning method. The obtained yarn is cut into a desired length and used.

  The cellulosic fibers used in the present invention are preferably those used as a raw material for paper. Specifically, natural fibers include cotton, and regenerated fibers include rayon staples. The blend ratio of the water-soluble staple and the cellulosic fiber staple is preferably 20:80 to 80:20, more preferably 40:60 to 60:40, by weight. If the mixing ratio of the water-soluble staple is less than 20%, the dimensional stability against moisture is improved. However, the degree of looseness of the cellulosic fiber staple after the water-soluble staple is dissolved is not preferable, and if it exceeds 80%, it is not preferable. Although it becomes easy, it is not preferable because the dimensional stability against moisture is deteriorated.

  The number of twists of the blended yarn may be any number that can withstand weaving. The smaller the number of twists, the better the dispersion after the water-soluble staple is dissolved. The larger the number of twists, the more difficult it is to break up. The thickness of the blended yarn is preferably as thin as it can withstand weaving. However, the thickness of the blended yarn must be strong enough to provide the reinforcing effect.

  The upper paper and lower paper used for the gum tape can be made of the materials usually used for the gum tape. In addition, a water-soluble adhesive is preferably used as the adhesive that bonds the upper paper and the lower paper with the reinforcing yarn interposed therebetween. For example, polyvinyl alcohol, polyacrylamide, polyacrylic acid, polyacrylic ester, polyvinyl ether, cellulose derivative, modified starch, glue and the like can be mentioned.

  As the adhesive constituting the rewet adhesive layer used in the present invention, an adhesive having good water dispersibility can be used. Examples include water-soluble adhesives made of water-soluble resins such as polyacrylamide, polyacrylic acid, and polyacrylic acid esters, as well as water-dispersible vinyl acetate adhesives, water-soluble hot melt resins, etc. Is mentioned.

  The form of the reinforcing yarn used in the present invention can achieve the object of the present invention by a method in which a plain weave mesh structure woven with blended yarn is sandwiched between an upper paper and a lower paper and integrated with an adhesive. . Further, it is possible to adopt a method in which the blended yarns are warp yarns and weft yarns, intersected at substantially right angles, and sandwiched between upper paper and lower paper and integrated with an adhesive.

  The present invention will be described below with reference to examples.

Example 1
A 33% aqueous solution of polyvinyl alcohol having a saponification degree of 93 mol% was dry-spun, and a spun yarn comprising 50 parts of water-soluble staple and 50 parts of cotton obtained by cutting was produced. The fineness of the spun yarn was 200 dtex × 3, and the number of twists was upper twist / lower twist = S300 / Z400 T / M. This spun yarn is changed from a water temperature of 20 ° C. to 60 ° C., one end is fixed under a constant length, and the other yarn end is connected to a sensor part of a tensile tester and contracted when it is immersed in warm water. The maximum value of was measured.

  Further, using this spun yarn, the shrinkage rate when immersed in the warm water was measured. The measuring method is as follows. Measure the yarn length by applying a load of 0.01 cN / dtex to one end of the sample, then measure the yarn length when immersed in water at each temperature with the load applied, and shrinkage at each water temperature Was calculated. The results are shown in Table 1.

(Comparative Example 1)
Three twisted yarns of water-soluble filaments obtained by dry spinning a 33% aqueous solution of polyvinyl alcohol having a saponification degree of 93 mol% were prepared. The fineness of the twisted yarn was 200 × 3 dtex, and the number of twists was upper twist / lower twist = S200 / Z300 T / M. This twisted yarn is changed from a water temperature of 20 ° C. to 60 ° C., one end is fixed under a constant length, the other yarn end is connected to a sensor part of a tensile tester, and the contraction force generated when immersed in warm water. The maximum value of was measured.

  Moreover, shrinkage rate was computed by the method similar to Example 1 using this twisted yarn. The results are shown in Table 1.

  From Table 1, it was confirmed that the twisted yarn and shrinkage rate of the polyvinyl alcohol of Comparative Example 1 showed considerably large shrinkage force and shrinkage rate, but the blended yarn of Example 1 had smaller shrinkage force and shrinkage rate than this.

(Example 2)
A gummed tape with reinforcing yarn was produced using the blended yarn comprising the polyvinyl alcohol-based water-soluble staple and cotton yarn produced in Example 1. The paper width was 50 mm. The production method of the gummed tape containing the reinforcing yarn was the same as that of the conventional method, and the above-mentioned blended yarn was joined as a reinforcing yarn by sandwiching a woven fabric in an oblique lattice shape with a tape material at intervals of 10 mm. A pressure-sensitive adhesive was applied to one side of the tape to obtain a gummed tape with reinforcing yarn.

  Corrugated cardboard paper was cut to 50 × 250 mm, 150 mm of the prepared mixed-spun reinforced gummed tape was bonded together, and morphological stability was observed when left for 1 day under high humidity (30 ° C., 80% RH atmosphere).

  In addition, form stability was observed by spraying water onto the tape bonded to the cardboard in the same manner as described above. Furthermore, it was left to stand under the following temperature and humidity conditions, and the peel strength was measured. Water spray sprayed 20 degreeC tap water with the spray container. A sample was allowed to stand for 30 minutes after spraying with water, and then dried for one day in an atmosphere of 20 ° C. and 65% RH. The peel strength was measured using a constant speed tensile tester. The holding interval is 200 mm, and the pulling speed is 100 mm / min. Met. The measurement results are shown in Table 2.

(Comparative Example 2)
A gummed tape with a reinforcing yarn was produced in the same manner as in Example 2 by using the twisted yarn made of the polyvinyl alcohol filament yarn used in Comparative Example 1, and the same test as in Example 2 was performed. The results are shown in Table 2.

  From the results shown in Table 2, the rubber tape with reinforcing yarn made of the polyvinyl alcohol filament yarn of Comparative Example 2 has a problem that the bonded surface is deformed and partially peeled due to shrinkage of the twisted yarn under high humidity depending on conditions. It was recognized, and the peel strength of the gummed tape with reinforcing yarn of Comparative Example 2 which was allowed to stand under these conditions was also reduced. On the other hand, the appearance of the gum tape using the blended yarn made of the polyvinyl alcohol staple and cotton yarn of Example 2 as the reinforcing yarn is not observed even under high humidity, and the water spray → deformation during the drying process. It was confirmed that the decrease in peel strength was slight.

(Example 3)
Affixed gum tape with reinforcing yarn produced in Example 2 and Comparative Example 2 was attached to a recyclable corrugated cardboard, and the pulp disintegration property during regeneration was observed. Was good and a recyclable pulp beating liquid could be prepared.

Claims (1)

  Between the upper paper and the lower paper, a blended yarn composed of a water-soluble staple and a cellulose-based natural fiber or a cellulose-based recycled fiber staple is arranged as a warp yarn, a weft yarn, or a plain weave fabric is arranged. A base material for a gum tape is bonded by using a water-soluble or water-dispersible adhesive as an adhesive for bonding the upper paper and the lower paper, and a rehumidifying adhesive layer is provided on one side of the gum tape base. Characteristic rubber tape with reinforcing yarn.