JP5046893B2 - Cloth adhesive tape - Google Patents

Abstract

A fabric-backed pressure-sensitive adhesive tape which realizes thickness reduction and weight reduction and which is excellent in hand-cuttability in both weft and warp directions and in fabricability, more specifically, a fabric-backed pressure -sensitive adhesive sheet (100) which comprises both a laminated base fabric (22) comprising base fabrics (1,2) for fabric-backed pressure-sensitive adhesive tape and laminations (20) provided on both sides of the base fabrics (1, 2) and a pressure-sensitive adhesive layer (24) formed on one side of the laminated base fabric (22) by coating. The base fabric (1) for fabric-backed pressure-sensitive adhesive tape is a woven fabric having a weave formed by weaving parallel-arranged warp threads (12) over the whole width with weft threads (16) alternately and the base fabric (2) therefor is a knitted fabric made by inlaying weft threads (16) in independent chain stitches (14) formed by knitting parallel-arranged warp threads (12) over the whole width. The warp threads (12) and weft threads (16) of the base fabrics (1, 2) are made from a resin composition which is prepared by incorporating a nonpolar resin with 0.05 to 3.0mass% of an inorganic filler.

Description

  The present invention relates to a thin-layer cloth adhesive tape.

  In recent years, cloth adhesive tape is not only used for packing and packing work using corrugated cardboard etc., but also for curing and protecting walls and floors during painting and moving work. Due to the simplicity provided by ease, it has come to be frequently used for emergency fixing and temporary fixing in daily life.

  In general, a cloth adhesive tape is manufactured by laminating one or both surfaces of a substrate such as a woven fabric or a knitted fabric with a polyolefin resin such as a polyethylene resin, and then applying a pressure-sensitive adhesive. In addition, as the yarn types constituting these woven and knitted fabric base materials, rayon staple fiber, cotton yarn, CVC (chief value of cotton: PET / cotton blended yarn) yarn, TR yarns (polyester / sulfur blend yarns), multifilament yarns, flat yarns and the like are generally used (for example, see Patent Documents 1 to 6).

The fabric pressure-sensitive adhesive tape having such a structure maintains the strength in the warp direction (longitudinal direction, longitudinal direction, warp direction) while maintaining hand cutting in the weft direction (width direction, lateral direction, weft direction). The biggest feature is that it can be secured sufficiently. Such characteristics maintain the minimum strength required for various operations continuously in the warp direction (longitudinal direction) while maintaining ease of tearing in the weft direction (width direction) and linearity of the tear. Therefore, it is manifested by a fixing effect that reliably adheres the laminate layer at the intersection of the warp and the weft and suppresses the deviation between the warp and the weft.
Japanese Examined Patent Publication No. 1-41189 Japanese Patent No. 2623947 Japanese Patent No. 2635795 Japanese Patent No. 2843043 Japanese Patent No. 3555880 Japanese Utility Model Publication No. 4-69482

  As mentioned above, since cloth adhesive tapes are frequently used in daily life, thinner and lighter ones (e.g., compared to commercial products) are eagerly desired. . In addition, since the applications have been expanded to various types, in some cases, not only the weft direction but also the longitudinal direction has become required.

  However, in response to such demands, the conventional woven fabric base material using standard spun yarn can achieve the weft and warp direction hand cutting properties, but the thickness of the warp fibers constituting the base material is reduced. There is a limit, and in this case, in the type that laminates one side, since the space volume ratio of the laminate layer in the cloth adhesive tape is increased to some extent, it is necessary to apply a large amount of adhesive to fabric adhesive tape production, There was a limit to weight reduction.

  In order to solve this problem, it has been proposed to use a multifilament yarn such as a polyester yarn for the warp. However, the multifilament yarn generally tends to have a high tensile strength. It has been necessary to impart hand cutting properties by thinning the warp yarn or by reducing the strength by applying chemical and physical treatments to the warp. In this case, there is a problem that handling becomes complicated in manufacturing and man-hours (labor) increases, resulting in a problem that productivity is lowered.

  In addition, a cloth adhesive tape in which a base fabric laminated with the same kind of polyethylene resin is laminated on both sides of a woven fabric base material using a flat yarn made of polyethylene resin or the like as warp and weft in order to achieve both a thin layer and light weight. Is on the market. However, in such cloth adhesive tape, although a certain degree of thinning and weight reduction can be realized, it is necessary to increase the tensile strength of the weft yarn in order to balance the strength in the warp direction and the weft direction in the cloth adhesive tape. Therefore, the hand cutting property in the warp direction was insufficient.

  On the other hand, a cloth adhesive tape using a knitted fabric as a base material is commercially available as a duct tape in the United States and the like, and further, as disclosed in Patent Document 5, polyester warp and weft On the other hand, a knitted fabric base material using flat yarn has been proposed, and attempts have been made to improve the apparent thickness and weight. However, cloth adhesive tape using such a knitted fabric as a base material causes problems in manufacturing and appearance during production of the knitted fabric, and also exhibits sufficient tearing due to insufficient adhesion of the laminate. The present situation is that none of them has yet been obtained, or those having sufficiently satisfactory characteristics.

  That is, in the case of using a knitted fabric base material described in Patent Document 5 and the like, nonpolar flat yarns are inserted as wefts over the entire width of warp yarns in which a large number of polar multifilaments are arranged in parallel and independently chain knit. The knitted fabric is formed, but when inserting the weft into the warp loop formed at the time of knitting, the yarn breaks due to lack of slipperiness or friction (friction heat) of the nonpolar flat yarn (for example, Low-density polyethylene (LDPE) has a coefficient of friction of 5.0), and warps may be damaged and the substrate itself may be cut off. Also, in some cases, the frictional charge that occurs prominently in the weft may cause the weft to break or cause problems with the knitting machine such as sagging or slipping, which is improved from the viewpoint of workability. Was desired.

  Traditionally, this triboelectric charge has been known to occur during the production of woven fabrics and knitted fabrics and during subsequent processing, but the details of the factors and mechanism of action have not yet been fully elucidated. Further, as the triboelectricity trains known from experience become farther away, the frictional voltage (for example, the charged voltage measured according to the Japanese Industrial Standard JIS L 1094 5.2 “Testing Method for Woven and Knitted Voltage”). However, there is still a lot of phenomena that cannot be explained theoretically because a significant amount of triboelectric charging may occur in the friction between the same type of fiber or metal roll and the base material. This is the current situation.

  Furthermore, when laminating the same nonpolar resin as the nonpolar flat yarn on the knitted fabric, a chemical and / or physical AC (anchor coat) treatment is usually performed for the purpose of improving adhesion. In many cases, in the case of chemical AC treatment, the AC agent is partially repelled by the electrostatic charging of the knitted fabric (partial repelling occurs), or in the case of physical AC treatment such as corona (discharge) treatment. The inter-yarn distance in the space inside the fiber may be held more than necessary due to the electric repulsive force. When this happens, the wettability between the laminate resin and the substrate becomes uneven and insufficient, and as a result, the adhesiveness between the two cannot be sufficiently improved, and it is difficult to locally exhibit good hand cutting properties. there were.

  Therefore, the present invention has been made in view of such circumstances, and a cloth adhesive tape excellent in workability in both the weft direction and the warp direction, while realizing thinning and weight reduction. The purpose is to provide.

  In order to solve the above-mentioned problems, the present inventor has intensively studied, and as a result, by using a warp and a weft constituting a woven or knitted fabric that is a base material of a cloth adhesive tape, having a predetermined composition. The inventors have found that not only the substrate but also the properties of the cloth adhesive tape can be improved, and the present invention has been achieved.

  That is, the cloth adhesive tape according to the present invention is a base material composed of a woven or knitted fabric having warp and weft, preferably a weft or a warp and a weft composed of a flat yarn, and a woven or knitted fabric. Formed on one side or both sides of the base material, and a laminate base fabric having a laminate layer formed on one side or both sides of the base material and resin laminated, and And a pressure-sensitive adhesive layer coated with a pressure-sensitive adhesive, and at least wefts, preferably both warp and weft, of the warp and weft constituting the substrate are 0.05 to It consists of a resin composition containing 3.0% by mass (substantially synonymous with% by weight) of an inorganic filler. In addition, it is preferable to provide an anchor layer formed chemically or physically on one or both sides of the substrate.

  As a result of measurement and analysis of various physical properties of the cloth adhesive tape having such a configuration, the present inventor has found that the above-described content is contained in a nonpolar resin such as a polyolefin resin as warp and weft (at least weft) constituting the substrate. When an inorganic filler is added in a proportion, at least the weft yarn has an apparent polarity and slipperiness, which improves the slippery when forming the base material and has an antistatic effect (friction charging). It has been found that a deterrent effect is obtained. Moreover, when laminating resin on the base material, it was confirmed that the adhesion between the base material and the laminate layer was enhanced by the antistatic effect exhibited by the base material. In particular, it has been confirmed that, for example, in a knitted fabric having a structure in which a weft is inserted into a loop formed by chain-knitting warps as described above, the improvement in slipperiness and the antistatic effect are remarkable. As a result, improvement in hand cutting and tearing is achieved, and also when a flat yarn is used as a warp or weft, a significant effect can be obtained. As a result, the substrate for cloth adhesive tape and further the cloth adhesive tape can be further improved. Thinning and weight reduction are also realized.

  The base material preferably has a warp fineness (Dwarp) of 10 to 1000 denier and a warp weaving density (Uwarp) equal to or higher than a weft weaving density (Uweft). The weaving density is represented by the number of driving (lines / inch).

  Further, the resin constituting the laminate layer has a melting point of 65 to 350 ° C., and at least the weft of the warp and the weft has a melting point of 65 to 250 ° C. and a melt flow rate (MFR) of 0.00. It is preferable that it is formed of a resin having 1 to 20.

  Furthermore, the volume of the resin constituting the laminate layer is preferably 20% or more, more preferably 50% or more of the space volume in the base material.

  Furthermore, the adhesion between the laminate layer and the substrate in the laminate base fabric is more preferably 3 (N / inch) or more.

The pressure-sensitive adhesive has a storage elastic modulus (G ′: G prime) of 10 ⁵ to 10 ⁷ (dyn / cm ² ) and a thickness of 5 to 200 μm. When the thickness is 1.0 mm or less, it is useful.

  Furthermore, the base material is more preferably made of a knitted fabric in which warp yarns are chain-knitted.

  More specifically, the weft is made of a flat yarn having a width of 0.2 to 2.0 (mm) and a thickness of 0.01 to 0.1 (μm).

  According to the present invention, since the resin laminate layer is formed on the base material composed of a woven or knitted fabric having warps and wefts through the anchoring layer, it is possible to easily realize thinning and weight reduction. . Further, at least of the warps and wefts constituting the base material is made of a polyolefin-based resin composition containing 0.05 to 3.0% by mass of an inorganic filler, at least the wefts have polarity and slip. This improves the slipperiness and antistatic effect during base material formation, and improves the workability by preventing breakage and cutting of warps and wefts, while improving the wettability between the base material and the laminate layer. Uniform and sufficiently enhanced, and thereby the adhesiveness between the two can be sufficiently enhanced, so that the hand cutting properties of both the warp and the weft can be improved.

  Hereinafter, embodiments of the present invention will be described in detail. In addition, the same code | symbol is attached | subjected to the same element and the overlapping description is abbreviate | omitted. Further, the positional relationship such as up, down, left and right is based on the positional relationship shown in the drawings unless otherwise specified. Furthermore, the dimensional ratios in the drawings are not limited to the illustrated ratios. Further, the following embodiments are exemplifications for explaining the present invention, and are not intended to limit the present invention only to the embodiments. Furthermore, the present invention can be variously modified without departing from the gist thereof.

  FIG.1 and FIG.2 is a top view which shows roughly the base material for cloth adhesive tapes with which suitable one Embodiment of the cloth adhesive tape by this invention is equipped. A cloth adhesive tape substrate 1 (base material) shown in FIG. 1 is made of a woven fabric having a woven structure in which wefts 16 are alternately woven over the entire width of parallel warps 12. Here, the term “woven fabric” refers to a fabric in which a predetermined number of warp yarns are applied to a loom and weft yarns glued so as to withstand friction are continuously crossed by shuttle, pneumatic pressure, hydraulic pressure, or the like.

  A cloth adhesive tape base material 2 (base material) shown in FIG. 2 is made of a knitted fabric in which wefts 16 are inserted over the entire width of independent chain knitting 14 in which warp yarns 12 arranged in parallel are warped. . Here, “warp knitting” is a method of knitting a warp yarn that has been warped to a yarn introduction needle in a state parallel to the needle, entangled with the knitting needle and performing a knitting motion. Thus, when the opening and closing are made and one thread is always entangled with one needle, a chain of loops is formed in a string shape.

  Further, FIG. 3 is a cross-sectional view schematically showing a main part of a preferred embodiment of the cloth adhesive tape according to the present invention. The cloth adhesive tape 100 has a pressure sensitive adhesive applied to one side of a laminate base fabric 22 in which a laminate layer 20 is formed on both sides of the cloth adhesive tape substrates 1 and 2 shown in FIGS. 1 and 2, respectively. The pressure-sensitive adhesive layer 24 is provided. An anchor layer may be formed on one side or both sides of the fabric adhesive tape substrates 1 and 2 from the viewpoint of enhancing the bondability between the fabric adhesive tape substrates 1 and 2 and the laminate layer 20. Can be formed by, for example, physical treatment (including mechanical treatment) such as corona treatment, or chemical treatment.

  In the fabric adhesive tape substrate 1 made of woven fabric and the fabric adhesive tape substrate 2 made of knitted fabric, the materials of the warp 12 and the weft 16 are not particularly limited as long as they are nonpolar resins. Non-polar resins such as polyester resins, polyester resins, polystyrene resins, polyamide resins, and the like. More specifically, polyester (polyethylene terephthalate), polyamide (6-nylon, 66-nylon), viscose Rayon, acetate, polyvinyl alcohol-based synthetic resin (vinylon), polyurethane, and the like are suitable, and polyester is desirable from the viewpoint that the thickness of the cloth adhesive tape substrate 1 and 2, and thus the cloth adhesive tape 100 can be further reduced.

  Further, the form of the yarn is not particularly limited, but preferably, the warp yarn 12 is formed of a filament yarn, a spun yarn, a bulky yarn, a flat yarn or the like, and the weft 16 is formed of a flat yarn.

  Here, the filament yarn can be used in the form of a multifilament yarn consisting of several continuous filaments, many of which are equivalent to chemical fibers, and a hybrid multifilament that combines dissimilar filaments. Can also be used.

  Span yarn refers to yarn spun by bundling natural fibers or short cut chemical fibers and twisting them. The above-mentioned rayon yarns, cotton yarns, CVC yarns, TR yarns, etc. are generally used. This thread has excellent properties.

  In addition, bulky yarn is a straight filament yarn that is crimped to give spring elasticity, yarn bulkiness, moisture retention, and moisture absorption. Used to improve the difficulty of breaking filament yarns as yarns.

  Furthermore, the flat yarn (flat yarn) is formed by cutting a film produced by a T-die or an inflation film-forming machine into a suitable width (slit) into a tape shape, and then orienting molecules in a predetermined direction by stretching. Say something. If the flat yarn has an excessively small rigidity, it may be twisted with a small force, or the cross-sectional area may be changed by a slight change in tension, which may cause weft breakage. Also, if slipperiness is insufficient, during woven or knitted fabrics, it is likely to cause unsuccessful release such as dimensional change due to release friction from the raw yarn bobbin, and yarn breakage mainly due to generation of static electricity due to release friction or warp friction. .

  Here, when a filament yarn is used as the warp yarn 12, it is easy to obtain the same strength with a thin yarn as compared with a spun yarn and a bulky yarn, and as a result, the base material 1, 2 (base fabric) for cloth adhesive tape can be made thinner. There is. On the other hand, when a spun yarn or a bulky yarn is used as the warp yarn 12, it is disadvantageous from the viewpoint of thickness, but since the fiber length is shorter than that of the filament yarn, the tearability can be improved and the entanglement effect with the weft yarn 16 can be achieved. Therefore, there is an advantage that it is easy to improve hand cutting performance. On the other hand, when a flat yarn is used as the warp yarn 12, from the viewpoint of imparting warp direction hand cutting properties, attention should be paid to the combination with the weft yarn 16. However, since the cross-section has a flat rectangular shape, the number of driven yarns can be increased. There is an advantage that the number of the base materials 1 and 2 for the cloth adhesive tape can be reduced.

  Further, when a flat yarn is used as the weft 16, the cloth adhesive tape substrates 1 and 2 can be made thinner, and the linearity of tearing of the cloth adhesive tape can be easily maintained. There exists an advantage which becomes easy to ensure adhesiveness etc.

  Here, whether the hand cutting property is good or bad can generally be judged by cutting with a smaller stress and the linearity of the cut edge, that is, the linearity of tearing.

  In order to improve the hand cutting property by increasing the cutting property with a small stress, the ease of loosening of the warp yarn 12 is increased, the tensile strength of the warp yarn 12 is reduced compared to the weft yarn 16 by lowering the strength, and the lower elongation is reduced. It is effective to make it easy to create a trigger at the time of cutting and to fix the warp yarn 12 and the weft yarn 16 so that they do not shift when stress is applied. For example, if a spun yarn is used among the above-mentioned various yarns, the ease of loosening of the warp yarn 12 can be further increased, and in order to reduce the strength of the filament yarn, it can be made thin or chemically / physical. It is useful to reduce the strength by treatment.

  In order to sufficiently secure the straightness of the cut end, it is preferable to increase the alignment of the weft yarns 16. For this purpose, it is advantageous to increase the number of driven yarns. If a flat yarn is used as the weft yarn 16, the number of driven yarns is increased. The same effect as increasing can be produced.

  In general, the tearing linearity in the weft direction tends to be relatively easy to develop. However, when a flat yarn is used for the warp yarn 12 in the woven fabric, the warp direction hand cutting property is not expressed due to its structure, Tend to be difficult to tear apart. One of the factors is that, as described above, the tensile strength of the weft is very large compared to the warp. For example, in the base material described in Patent Document 5 described above, the tensile strength when polyester fiber is used for the warp is 40 to 400 gf (0.392 to 3.92 N), and the strength of the flat yarn of the weft is 800-2300 gf (7.84-22.5 N), which is an order of magnitude larger than warp.

  On the other hand, in the cloth adhesive tape substrate 2 made of, for example, a knitted fabric, when a polyester fiber having a tensile strength of 40 to 400 gf (0.392 to 3.92 N) is used as the warp 12, for example, The tensile strength when the flat yarn is used is about the same as that of the warp 12, that is, about 400 gf (3.92 N) or slightly larger. Thereby, it is excellent in hand cutting property compared with the past, and a thinner cloth adhesive tape can be obtained.

  Therefore, at least the weft 16 of the warp 12 and the weft 16 in the cloth adhesive tape substrates 1 and 2 is originally 0.05 to 3.0 to a nonpolar resin such as a polyethylene resin that is nonpolar due to its chemical structure. It is formed from a resin composition to which an inorganic filler is added at a content rate of mass%. There is no restriction | limiting in particular as an inorganic filler, It can select from calcium carbonate, magnesium sulfate, aluminum oxide, etc. suitably, and can be used.

  Thus, when using what added the inorganic filler in the above-mentioned content rate to nonpolar resin, such as polyolefin resin, as warp 12 and weft 16 (at least weft 16) which constitute substrate 1 and 2 for cloth adhesive tapes, Apparent polarity and slipperiness are imparted to the warp 12 and the weft 16 (at least the weft 16), the slipperiness is improved when forming the base material, and the antistatic effect (friction charging suppression effect) is expressed. The

  Although the theoretical details of the mechanism of the action are not yet elucidated, the amount of adsorbed water increases due to the surface protrusion effect and surface modification effect of the inorganic filler, resulting in slipping and antistatic effects. Is presumed to be expressed. However, the mechanism is not limited to this.

  Further, if the added amount of the inorganic filler is 0.05 to 3.0% by mass, the elongation of the warp 12 and the weft 16 (at least the weft 16) is suppressed, and the stiffness (represents the stiffness of the film, JIS P 8125 load bending). Can be measured according to the stiffness test method of paperboard by the method.) Can be sufficiently prevented, and the occurrence of yarn breakage during yarn formation can be sufficiently prevented. It is possible to suppress yarn breakage when forming a fabric or knitted fabric, improve dimensional stability, and curl the substrate when laminating the laminate layer 20 on the fabric adhesive tape substrates 1 and 2 (Winding) can be suppressed.

  When the added amount of the inorganic filler is less than 0.05% by mass, the surface area of the warp 12 and the weft 16 (at least the weft 16) is insufficiently increased, and as a result, the slipperiness of the yarn is insufficient. The frictional resistance is not much different from that of a non-polar resin-free yarn, and a significant antistatic effect cannot be obtained. On the other hand, when the added amount of the inorganic filler exceeds 3.0% by mass, the rigidity of the warp yarn 12 and the weft yarn 16 (at least the weft yarn 16) itself is improved, but the transparency is remarkably lowered or the inorganic filler is removed from the yarn surface. It causes troubles that contaminate the yarn manufacturing environment and the base fabric manufacturing environment, such as part peeling off, and the adhesion strength during lamination is significantly reduced, making it difficult to obtain a practical product.

  Further, the laminate layer 20 is not particularly limited, but a polyolefin resin such as a polyethylene resin, a polypropylene resin, a polybutylene resin, or a copolymer thereof can be preferably used. Among these, the polyethylene resin is used from the viewpoint of cost and film formation. Is particularly preferred.

  Here, as a laminate layer, for example, when laminating a polyolefin resin such as polyethylene to a base material for cloth adhesive tape, in the base material for cloth adhesive tape using a thread made of general polyethylene to which an inorganic filler is not added, There is a tendency to require physical anchoring such as chemical anchoring or corona treatment, but at this time, the part due to electrostatic charging of the base material due to friction between the base materials for cloth adhesive tape or friction with the guide roll etc. Repelling (local repelling) occurs, or the internal space of the fiber is held more than necessary due to the electric repulsive force, resulting in uneven or insufficient wettability between the laminate resin and the warp and weft. As a result, the adhesion between the substrate for the cloth adhesive tape and the laminate layer becomes insufficient, and therefore, good hand cutting properties are not partially expressed. There is a tendency that kind of inconvenience.

  On the other hand, when laminating a polyolefin resin such as polyethylene on the base material 1 or 2 for the cloth adhesive tape as the laminate layer 20, for example, it has a stable hand cutting property due to good slipperiness and high antistatic effect. The cloth adhesive tape 100 can be obtained. Moreover, since the warp yarns 12 and the weft yarns 16 (at least the weft yarns 16) contain an inorganic filler, the apparent melting point can be increased and the heat resistance temperature can be increased. Can be heated at a higher temperature, thereby improving the wettability of the laminate layer 20 and further improving the adhesion between them. As a result, the hand cutting property of the cloth adhesive tape 100 can be further improved.

  Further, according to the cloth adhesive tape base material 2, since the warp yarns 12 are chain-knitted, the warp direction yarn elongation can be limited between the intersecting portions of the warp yarns 12 and the weft yarns 16. The hand cutting property of the adhesive tape 100 can be further improved.

In the cloth adhesive tape substrates 1 and 2, the warp 12 has a fineness (Dwarp) of 10 to 1000 denier, and the warp 12 has a weaving density (Uwarp) equal to or higher than the weft 16 weaving density (Uweft). That is, the following formula (1);
Uweft ≦ Uwarp (1),
Is preferably in the range satisfying the relationship represented by The weaving density is represented by the number of driving (lines / inch).

  When the fineness (Dwarp) of the warp yarn 12 is less than 10 denier, the warp strength is excessively lowered, and in some cases, the cloth adhesive tape may be cut by a weak impact. On the other hand, if the fineness (Dwarp) of the warp yarn 12 exceeds 1000 denier, the warp strength is excessively increased, which may make it difficult to cut by hand. If the weaving density (Uwarp) of the warp yarn 12 is less than the weaving density (Uweft) of the weft yarn 16, the warp yarn 12 will be excessively displaced when manually tearing in the weft direction, resulting in stress concentration. It becomes difficult and fuzz becomes noticeable on the cut surface.

  Further, the melting point of the resin constituting the laminate layer 20 is 65 to 350 ° C., the melting point of at least the weft 16 out of the warp 12 and the weft 16 is 65 to 250 ° C., and the melt flow rate is 0.1 to 20 It is preferable that it is formed with the resin which is. When the melting point of the resin of the laminate layer 20 is less than 65 ° C., the amount of flow into the base fabric is sufficient, but the processing temperature is low, so that it is difficult to thermally deteriorate the base fabric, and hand cutting properties are inconvenient. It tends to decrease to a certain extent. On the other hand, when the melting point of the resin of the laminate layer 20 exceeds 350 ° C., the processing temperature becomes excessively high, and thus the thermal deterioration of the base fabric becomes excessive. Tend to be difficult.

  Moreover, when the melting point of the weft 12 is less than 65 ° C., it tends to cause a decrease in strength due to thermal deterioration. On the other hand, when the melting point of the weft 12 exceeds 250 ° C., on the contrary, thermal degradation hardly occurs, and sufficient hand cutting property tends to be hardly exhibited.

  Further, when the MFR of the resin forming the weft 16 is less than 0.1, when the weft 16 is a flat yarn, the amount of discharge at the time of production becomes too small, and it is difficult to sufficiently increase productivity and economy. It is in. On the other hand, when the MFR of the resin forming the weft 16 exceeds 20, depending on the case, the film formability is extremely deteriorated and the workability tends to be remarkably impaired.

  Furthermore, it is useful that the volume of the resin constituting the laminate layer 20 is 20% or more of the space volume in the cloth adhesive tape substrates 1 and 2. If this ratio is less than 20%, the base fabric may not be sufficiently fixed by the laminate layer 20, and as a result, there is a tendency that inconveniences such as peeling of the laminate layer and deterioration of hand cutting property tend to occur.

  Furthermore, the adhesiveness between the laminate layer 20 and the cloth adhesive tape substrates 1 and 2 in the laminate base fabric 22 is more preferably 3 (N / inch) or more. When the adhesiveness is less than 3 (N / inch), peeling occurs between the laminate layer 20 and the cloth adhesive tape substrates 1 and 2 when the cloth adhesive tape 100 attached to the adherend is peeled off. Therefore, there is a tendency that the problem of soiling the adherend surface of the adherend tends to occur.

In addition, the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer 24 has a storage elastic modulus G ′ of 10 ⁵ to 10 ⁷ (dyn / cm ² ) and a thickness of 5 to 200 μm. More preferably, the thickness is 1.0 mm or less. When the storage elastic modulus G ′ is less than 10 ⁵ (dyn / cm ² ), the fluidity of the pressure-sensitive adhesive layer 24 becomes excessively high. On the other hand, when the storage elastic modulus exceeds 10 ⁷ , initial tack appears. In some cases, it tends to be unsuitable for use as an adhesive tape. Moreover, when the thickness of the cloth adhesive tape 100 exceeds 1.0 mm, when it is set as a roll-shaped tape, it will become excessively heavy and there exists a tendency for workability | operativity to deteriorate.

  Further, it is particularly preferable that the weft 16 is made of a flat yarn having a width of 0.2 to 2.0 (mm) and a thickness of 0.01 to 0.1 (mm). If the width of the weft 16 is less than 0.2 mm, the strength of the weft 16 tends to be excessively weak, and the straightness in the weft direction when hand cuts tends to be difficult to obtain. On the other hand, when the width exceeds 2.0 mm, there is a disadvantage that the flat yarn is easily broken. In addition, when the thickness of the weft 16 is less than 0.01 mm, the strength tends to be excessively low, and the cut tends to occur during processing. On the other hand, when the thickness exceeds 0.1 mm, the tape rigidity becomes excessive, and the followability to the adherend when using the tape tends to be deteriorated to an inconvenient level.

  4 and 5 are cross-sectional views schematically showing main parts of another preferred embodiment of the cloth adhesive tape according to the present invention. The cloth adhesive tape 200 shown in FIG. 4 has an adhesive layer 24 on one side of a laminate base fabric 26 in which the laminate layer 20 is formed on one side of the cloth adhesive tape substrates 1 and 2 shown in FIGS. Is provided. Moreover, the cloth adhesive tape 300 shown in FIG. 5 has adhesive layers 24 and 24 provided on both surfaces of the laminate base fabric 22 of the cloth adhesive tape 100 shown in FIG. Also in the cloth adhesive tapes 200 and 300 configured as described above, the same effects as the cloth adhesive tape 100 are exhibited.

  Specific examples according to the present invention will be described below, but the present invention is not limited thereto.

<Examples 1-3 and Comparative Examples 1-5>
A cloth adhesive tape having the same configuration as the cloth adhesive tape 100 shown in FIG. 3 was prepared using various yarns and substrate configurations shown in Tables 1 to 3 as warps and wefts. Also, a polyethylene film was extruded on both sides to a thickness of 0.1 mm to form a laminate tape.

<Evaluation>
For the laminated tapes of Examples 1 to 3 and Comparative Examples 1 to 5, the thickness, hand cutting property, workability, adhesion, dynamic friction coefficient, dynamic friction band voltage, tear strength, tensile strength, and elongation were measured by the following methods. evaluated.

(thickness)
With or without a polyethylene film, the thickness of the sample piece was measured using a dial thickness gauge (manufactured by PEAKOCK: MODEL H-1A).

(Hand cutting)
In the warp direction and the weft direction, for each of the laminate tapes obtained in Examples 1 to 3 and Comparative Examples 1 to 5, 10 test pieces were cut by hand, initial resistance at that time, cleanness of the cut surface, straight advance The quality was observed and the quality of hand cutting was judged.

(Processability)
The quality of workability was judged based on the presence or absence of yarn breakage during production, the presence or absence of yarn catching, the presence or absence of yarn twisting or sagging.

(Adhesion)
Each laminate film was processed into a cloth adhesive tape, and the adhesive strength was measured according to JIS Z0237. When the laminate layer was peeled off, the measured adhesiveness was set to be equal to or lower than the adhesive strength, and when the laminate layer was not peeled off, set to be equal to or higher than the adhesive strength.

(Dynamic friction coefficient)
For five weft test pieces, the dynamic friction coefficient was measured using a yarn dynamic friction coefficient measuring device (model: μk type) manufactured by Daiei Kagaku Co., Ltd., and the average value was calculated. At this time, the drum (material: nylon) rotation speed was 30 rpm, and the balance weight was 10 g.

(Dynamic friction band voltage)
In accordance with 5.2 friction band voltage measurement method of JIS L1094, the friction band voltage in the longitudinal direction and the weft direction was measured.

(Tear strength)
Based on the tear strength of paper and board of JIS P8116, the tear strength in the warp direction and the weft direction was measured using ELEMENTORF TEARING TESTER manufactured by Toyo Seiki Co., Ltd.

(Tensile strength)
Based on JIS L 1096A, the tensile strength in the warp direction and the weft direction was measured.

(Elongation)
The elongation at break when measuring the tensile strength was measured using STOROGRSPH V1-C manufactured by Toyo Seiki Co., Ltd., and the value was taken as the elongation in the longitudinal direction and the weft direction.

  The results of measurement and evaluation of the laminated tapes of Examples 1 to 3 and Comparative Examples 1 to 5 as described above are summarized in Tables 1 to 3.

  As described above, the cloth adhesive tape according to the present invention is excellent in hand cutting in both the weft direction and the warp direction and processability while realizing thinning and weight reduction. Regardless of packing / packing work, curing application to protect walls and floors during painting and moving work, various applications such as emergency fixing and temporary fixing, and various fields where these work is necessary, Can be widely used.

It is a top view which shows roughly the base material for cloth adhesive tapes with which suitable one Embodiment of the cloth adhesive tape by this invention is equipped. It is a top view which shows roughly the base material for cloth adhesive tapes with which suitable one Embodiment of the cloth adhesive tape by this invention is equipped. It is sectional drawing which shows schematically the principal part of suitable one Embodiment of the cloth adhesive tape by this invention. It is sectional drawing which shows schematically the principal part of other suitable embodiment of the cloth adhesive tape by this invention. It is sectional drawing which shows schematically the principal part of other suitable embodiment of the cloth adhesive tape by this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1, 2 ... Base material (base material) for cloth adhesive tapes, 12 ... Warp, 14 ... Independent chain knitting, 16 ... Weft, 20 ... Laminate layer, 22, 26 ... Laminate base fabric, 24 ... Adhesive layer, 100, 200, 300 ... cloth adhesive tape.

Claims (8)

A laminated base fabric having a base material composed of a woven or knitted fabric having warps and wefts, and a laminate layer formed on one side or both sides of the base material and laminated with a resin;
An adhesive layer formed on one or both sides of the laminate base fabric and coated with a pressure-sensitive adhesive; and
With
The laminate base fabric further has an anchor layer formed chemically or physically on one or both sides of the base material,
Of the warp and the weft, at least the weft is made of a resin composition containing a non-polar resin containing 0.05 to 3.0% by mass of an inorganic filler.
Cloth adhesive tape. The base material has a warp fineness (Dwarp) of 10 to 1000 denier, and the warp weave density (Uwarp) is equal to or higher than the weft weave density (Uweft).
The cloth adhesive tape according to claim 1. The resin constituting the laminate layer has a melting point of 65 to 350 ° C.
Among the warps and the wefts, at least the wefts are formed of a resin having a melting point of 65 to 250 ° C. and a melt flow rate of 0.1 to 20.
The cloth adhesive tape according to claim 1 or 2. The volume of the resin constituting the laminate layer is 20% or more of the space volume in the base material,
The cloth adhesive tape according to any one of claims 1 to 3. Adhesion between the laminate layer and the base material in the laminate base fabric is 3 (N / inch) or more.
The cloth adhesive tape according to any one of claims 1 to 4. The pressure sensitive adhesive has a storage elastic modulus of 10 ⁵ to 10 ⁷ (dyn / cm 2) and a thickness of 5 to 200 μm.
The cloth adhesive tape has a thickness of 1.0 mm or less,
The cloth adhesive tape according to any one of claims 1 to 5. The base material is composed of a knitted fabric in which the warp is chain-knitted,
The cloth adhesive tape according to any one of claims 1 to 6. The weft is a flat yarn having a width of 0.2 to 2.0 (mm) and a thickness of 0.01 to 0.1 (mm).
The cloth adhesive tape according to any one of claims 1 to 7.

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