JP2014088636A - Formative monofilament and binding material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a formative monofilament freely plastically deformed by external stress though being made of a resin and having performance of holding its form even after stress removal, i.e., having excellent formativeness, and whose binding force is more improved.SOLUTION: The formative monofilament is obtained by melt-spinning a thermoplastic resin composition comprising inorganic particles with the weight average particle diameter of 2 μm or less by 10 to 60 mass%, and the monofilament has one or more hollow parts over the whole length in the fiber axis direction at the cross-section thereof.

Description

  The present invention is a monofilament which is made of a resin and freely deforms plastically by external stress and retains its shape even after the stress is removed, that is, has an excellent formability, and is particularly used for food packaging and electric wire bundling. And a binding material.

  Twist binding material has features such as easy bag closure, bundling of wire, etc., and repeated use, so it can be used for sealing bags in the food sector and electrical in the electrical field. It is used in many industrial fields, such as cord bundles, wiring cord bundles, cable bundles, etc., and in the agricultural and horticultural field, it is used to bind plants to piles and support bars, or to bundle vegetables.

  And most of twisted binding materials currently used are binding materials with metal cores that use a metal wire for the core and a polyethylene resin film such as polyethylene or polypropylene, which are bonded together. Since the metal wires are entangled and plastically deformed, and the resin film is further entangled with the metal wire, the shape of the binding portion is fixed, so that the bag can be sealed and the wire can be bundled.

  However, in the food field, for the purpose of food hygiene management, metal detectors are inspected to prevent foreign substances such as metals from entering. However, when the bag is sealed with a metal core tie, it reacts with the metal detector. There was a bug that it was. In addition, if food that has been packaged with a binding material containing a metal core is placed in a microwave oven, there is a risk of arc discharge.

  On the other hand, when bundling electric wires and cables in the mechanical field and the like, there has been a concern that a bundling material containing a metal core may cause electric leakage.

  Furthermore, it has been pointed out that there is a risk that a binding material containing a metal core may cause rust during use or an accident such as a protruding metal edge damaging the human body.

  Therefore, in order to eliminate the drawbacks of these metal cored binding materials, binding materials using a thermoplastic resin monofilament have been proposed. Resin binders that do not use metals can be used with metal detectors, can be used with microwave ovens, have no fear of leakage, do not rust, are not easily injured, and are separated at disposal There are advantages such as not being necessary and weight saving.

  However, general thermoplastic resin monofilaments used in fishing nets, tegus, brushes, etc. have the advantage of excellent resilience. Even if they are deformed by external stress, they are restored as soon as the stress is removed. Restore to the form. Due to this excellent resiliency, it has been difficult to give the thermoplastic resin monofilament the ability to plastically deform and retain its shape even after stress is removed, ie, the formability.

  In order to solve such problems and obtain a thermoplastic resin monofilament that can be used as a binding material, a thermoplastic resin monofilament in which inorganic fine particles are contained in a thermoplastic resin (see, for example, cited documents 1 to 3) is proposed. Has been.

  However, in these thermoplastic resin monofilaments, it is necessary to add a large amount of inorganic fine particles for the purpose of suppressing elastic recovery and giving sufficient shapeability, and therefore, it is disadvantageous that it tends to become brittle when repeated use. In addition, the binding force was not satisfactory compared to the binding material with a metal core.

  On the other hand, a thread-like or belt-like plastically deformable polyethylene material (for example, refer to Cited Document 4) made of a stretched product of low-viscosity polyethylene has been proposed. However, since this material is made of polyethylene, the heat-resistant temperature is low and 80 ° C. Since deformation was recovered by the above heat treatment, it could not be used in an environment where a high temperature was expected.

JP 2002-284220 A Japanese Patent Application Laid-Open No. 11-50334 JP-A-10-264961 JP 7-238417 A

  The present invention has been accomplished as a result of investigations aimed at solving the problems of the thermoplastic resin monofilaments used as the above-described conventional binding materials.

  Accordingly, the object of the present invention is to make plastic deformation freely by external stress while being made of resin, and to maintain its form even after the stress is removed, that is, excellent formability, and further improve the binding force. The object is to provide a shapeable monofilament.

  In order to achieve the above object, according to the present invention, the monofilament comprises a monofilament obtained by melt-spinning a thermoplastic resin composition containing 10 to 60% by mass of inorganic fine particles having a weight average particle diameter of 2 μm or less. There is provided a shapeable monofilament characterized by having at least one hollow portion extending over the entire length in the fiber axis direction.

In the shapeable monofilament of the present invention,
The cross-sectional area of the hollow portion occupies 1 to 20% of the cross-sectional area of the monofilament,
The inorganic fine particles are barium sulfate and / or calcium carbonate;
The cross-sectional shape of the monofilament is an irregular cross-section in which the ratio of the maximum width W to the maximum height H is 1 ≦ W / H ≦ 15, and the monofilament has a horizontally elongated flat portion, and a flat portion It is preferable that each of the deformed cross-sections has one or more protrusions projecting in at least one vertical direction from the top to the bottom. When these conditions are applied, further excellent effects are expected to be obtained. can do.

  Further, the binding material of the present invention is characterized in that the shapeable monofilament is used at least in part, and in particular, the shapeable monofilament is used as a core material, and a resin film is laminated on the outer periphery of the core material. Exerts a preferable effect.

  According to the present invention, as described below, there are obtained a shapeable monofilament and a binding material using the same, which are made of a resin and have excellent shapeability and further improved the binding force.

(A), (b) is a partially broken perspective view which illustrates the shapeable monofilament of this invention. (A)-(e) is sectional drawing which illustrates the shapeable monofilament of this invention. (A)-(d) is sectional drawing which illustrates the shapeable monofilament of this invention which has a flat part and a projection part. It is a partially broken perspective view which illustrates the binding material of this invention. It is the perspective view which showed the binding state of the shapeable monofilament of this invention.

  The shapeable monofilament of the present invention comprises a monofilament obtained by melt spinning a thermoplastic resin containing 10 to 60% by mass of inorganic fine particles having a weight average particle diameter of 2 μm or less. It is characterized by having one or more hollow portions.

  Examples of the thermoplastic resin constituting the shapeable monofilament of the present invention include polyamide resins such as nylon 6, nylon 66, nylon 610, nylon 612, nylon 6/66 copolymer, and copolymers thereof, polyethylene terephthalate (hereinafter referred to as “polyethylene terephthalate”). PET), polybutylene terephthalate (hereinafter referred to as PBT), polyethylene naphthalate, polycyclohexanedimethylene terephthalate, and other polyester resins and copolymers thereof, polyvinylidene fluoride, ethylene / tetrafluoroethylene copolymer, tetrafluoroethylene / Fluororesin such as hexafluoropropylene / vinylidene fluoride copolymer, polyolefin resin such as polyethylene and polypropylene, polyphenylene sulfide resin (hereinafter referred to as PPS), polyacetal resin Although and the like, the strength and toughness, in terms of heat resistance, a polyester resin, PPS, polyacetal resin preferably represented by particularly PET and PBT, more PET is preferred.

  In the present invention, the thermoplastic resin contains inorganic fine particles. The material of the inorganic fine particles is glass beads, talc, silica, mica, calcium carbonate, magnesium hydroxide, alumina, zinc oxide, magnesium oxide, magnesium hydroxide. , Silica alumina, titanium oxide, calcium oxide, calcium silicate, molybdenum sulfide, antimony oxide, clay, diatomaceous earth, calcium sulfate, calcium sulfite, iron oxide, barium sulfate, magnesium carbonate, basic magnesium carbonate, dolomide, montmorillonite, bentonite, Examples thereof include iron powder, lead powder, zinc powder, aluminum powder, and carbon black. Among these, barium sulfate and / or calcium carbonate is particularly preferable in view of dispersibility in a thermoplastic resin and cost.

  It is important that the inorganic fine particles have a weight average particle size of 2 μm or less, particularly 1.5 μm or less. If the weight average particle size exceeds the above range, not only the strength of the monofilament is decreased, but also the spinneret Dirt becomes remarkable and causes variation in physical properties. Furthermore, it leads to inferior durability against repeated use. The lower limit of the weight average particle diameter is not particularly limited, but is preferably 0.05 μm or more.

  The weight average particle diameter of the inorganic fine particles can be measured, for example, by a light transmission centrifugal sedimentation method. The particles are dispersed in water by ultrasonic waves, and the particle size distribution of the particles is measured on a weight basis using a disk centrifugal sedimentation type particle size distribution analyzer (manufactured by Nikkiso Co., Ltd., BI-XDC), and the median diameter (D50) is averaged. The particle size.

  In this invention, by mix | blending inorganic fine particles with a thermoplastic resin, the elastic recovery property of a thermoplastic resin monofilament can be suppressed and a shaping property can be improved. Although the mechanism for improving the formability by containing inorganic fine particles is not clear, the inorganic fine particles dispersed in the thermoplastic resin partially inhibit the interaction between the thermoplastic resin polymer chains, so the monofilament A micro void is created at the time of deformation, and the micro void is irreversibly deformed such as being distorted or torn. In the present invention, it is preferable that the shapeable monofilament is stretched. However, by stretching, a microscopic void is generated between the inorganic fine particles and the thermoplastic resin polymer chain in advance, and thus the shapeability is improved. Greatly improved.

  It is important that the content of the inorganic fine particles in the thermoplastic resin is 10 to 60% by mass, preferably 20 to 50% by mass. When the blending amount is less than the above range, sufficient formability cannot be obtained, and when it exceeds the above range, not only the strength of the monofilament is lowered but also the monofilament becomes brittle and easily breaks by bending. Further, when spinning, dirt around the mouthpiece hole becomes remarkable, which may cause thread breakage and bump yarn, making stable production difficult.

  Next, the shape of the shapeable monofilament of the present invention will be described with reference to the drawings.

  FIG. 1 is a partially broken perspective view illustrating a shapeable monofilament of the present invention. Reference numeral 1 denotes a shapeable monofilament, 2 denotes a hollow portion, 3 denotes a flat portion, and 4 denotes a protruding portion. The shaded area represents the cross section of the shapeable monofilament 1.

  Here, the cross section of the shapeable monofilament 1 of the present invention is a cross section perpendicular to the fiber axis direction of the monofilament, and the cross sectional area of the monofilament 1 is a cross sectional area of the cross section perpendicular to the fiber axis direction of the monofilament. The total area of the cross section of the monofilament and the area of the hollow portion is defined.

  And it is important for the shapeable monofilament 1 of the present invention to have one or more hollow portions 2 over the entire length in the fiber axis direction in the cross section. In other words, the presence of the hollow portion 2 in the shapeable monofilament 1 causes the hollow portion 2 to irreversibly deform macroscopically in addition to the generation and deformation of the microscopic voids described above when external stress is applied. Thus, the elastic recovery property of the monofilament can be suppressed and the shapeability can be improved, and as a result, the binding force can be further improved.

  The cross-sectional area of the hollow portion 2 preferably occupies an area of 1 to 20% with respect to the cross-sectional area of the monofilament 1, and more preferably 5 to 15%. In addition, when there are a plurality of hollow portions 2, the total area of all the hollow portions is preferably within the above range.

  When the area ratio of the hollow portion 2 exceeds the above range, not only the strength of the shapeable monofilament 1 is lowered, but also deformation due to external stress is increased, and thus repeated use tends to be difficult. On the other hand, if it falls below the above range, the effect of the hollow portion 2 that improves the binding force tends to be difficult to obtain.

  2 and 3 illustrate cross-sectional views of the shapeable monofilament 1 of the present invention. In addition to the shape having one hollow part 2 at the center of the circular cross section shown in FIG. 2A, the hollow part 2 has a cross-sectional shape other than a circle, even if it has a plurality of hollow parts 2 (FIG. 2B). (FIG. 2C) may be used. In addition, when it has two or more hollow parts 2, it is preferable that the arrangement | positioning has a rotational symmetry which makes a gravity center a symmetric center in the cross section of the shapeable monofilament 1. Further, the outermost shape of the shapeable monofilament 1 is not limited to a circle, but an ellipse (FIG. 2 (d)), a rectangle (FIG. 2 (e)), or a combination thereof (FIGS. 3 (a) to (d). )) Etc.

  Here, the cross-sectional shape of the shapeable monofilament 1 of the present invention is a modified cross section in which the ratio of the maximum width W to the maximum height H is 1 ≦ W / H ≦ 15, and further 1 ≦ W / H ≦ 12. Is preferred. The maximum width W refers to the long side of the cross section or the widest length, and the maximum height H refers to the maximum length in the direction perpendicular to the length direction of the maximum width W. When the ratio W / H between the maximum width W and the maximum height H is outside the above range, the deformation becomes large when used as a twisted binding material, so that not only the workability is deteriorated but also the shapeable monofilament 1 is damaged. It is also easy to cause.

  Further, the maximum height H is preferably 0.3 to 5.0 mm, more preferably 0.5 to 3.0 mm in consideration of easiness along the shapeable monofilament 1 to the object to be bound.

  As illustrated in FIGS. 3A to 3D, the cross-sectional shape of the cross section of the shapeable monofilament 1 of the present invention is a flat portion 3 elongated in the horizontal direction, and at least one direction in the vertical direction from the flat portion 3. It is particularly preferable that the cross section has one or more projecting portions 4 projecting from each other, and in this case, even when used alone as a twisting and binding material, a flat portion is formed with respect to the projecting portions 4. 3 twists so that they bite into each other, the shapeability of the protrusions 4 and the shapeability of the flat portions 3 act synergistically and tend to exhibit excellent binding force.

  The shapeable monofilament 1 of the present invention preferably has a bending recovery rate of 40% or less, and more preferably 35% or less. Here, a method for measuring the bending recovery rate will be described. Make a set of two loops crossing monofilaments, fix the upper loop to the clasp, and apply a load (weight [g] of 1/2 the fiber fineness [denier]) to the lower loop for 3 minutes Thus, a pair of pine needle-shaped samples formed at the intersections of the loops is obtained. A sample is obtained by cutting the bent portion into a length of about 3 cm, taking a sample for 60 minutes, and then obtaining the bending recovery rate [%] from the opening angle θ measured by the equation: θ / 180 × 100.

  When the bending recovery rate exceeds the above range, the elastic recoverability is high, the shapeability is hardly exhibited, and the shapeable monofilament 1 having insufficient binding force is easily obtained.

  It is also possible to use the shapeable monofilament 1 of the present invention as a binding material 5 as shown in FIG. 4 in which a core material is used and a resin film 6 is bonded to the outer periphery of the core material. In this case as well, the metal detector can be used, the microwave oven can be used, the rust does not occur, it is hard to be injured, and it can be separated at the time of disposal, compared with the conventional binding material with a metal core. There are advantages such as unnecessary.

  In the formable monofilament 1 of the present invention, known additives such as a heat-resistant agent, a weather-resistant agent, a light-resistant agent, an antioxidant, a sequestering agent, an antistatic agent, a dye and a pigment are added depending on the use environment and purpose of use. An agent may be included. In particular, when coloring is performed with a dye or pigment, a marker function by color can be provided.

  Next, the manufacturing method of the shapeable monofilament 1 of this invention is demonstrated.

  In melt spinning the shapeable monofilament 1 of the present invention, the method of mixing the thermoplastic resin and the inorganic fine particles is not particularly limited, and the thermoplastic resin and the inorganic fine particles dry-blended at a predetermined ratio in a spinning machine. , A method of feeding thermoplastic resin and inorganic fine particles to a spinning machine while measuring, and preparing a master batch in which inorganic fine particles are contained in thermoplastic resin at a high concentration in advance and diluting to a predetermined concentration It can be selected according to the equipment and workability such as the supply method. Among these, the method using a masterbatch is most preferable from the viewpoint of dispersibility of inorganic fine particles in the shapeable monofilament 1.

  The shapeable monofilament 1 of the present invention is stretched as necessary after melt spinning and is put to practical use, but the general conditions of the thermoplastic resin to be used can be applied as they are for the spinning and stretching conditions. Moreover, a well-known method can be used also about the formation method of the hollow part 2. FIG.

  However, from the viewpoint of imparting formability, the draw ratio is preferably relatively low. For example, when PET is used as the thermoplastic resin, a draw ratio of 2.0 to 3.0 is particularly suitable. . When the draw ratio is less than the above range, not only the strength tends to be low, but also necking tends to occur due to bending deformation, and when the draw ratio exceeds the above range, the formability tends to be lowered.

  Moreover, the binding material 5 of this invention can be manufactured by a well-known manufacturing method except using the shapeable monofilament 1. For example, the shapeable monofilament 1 of the present invention prepared in advance is used as a core material and is extruded and integrated into a tape-shaped intermediate portion using a crosshead die in the same manner as an electric wire, or between two resin films 6. In addition, the shapeable monofilament 1 of the present invention as a core wire can be manufactured by stretching along the longitudinal direction, heat-softening only the joint surface, and pressing and bonding from above and below.

  Hereinafter, examples of the shapeable monofilament of the present invention will be described in more detail. However, the present invention is not limited to the following examples as long as the gist thereof is not exceeded.

  Moreover, the physical characteristics of the shapeable monofilament of the present invention described above and below are values measured by the methods described above and below.

[Area ratio of hollow part]
30 m of the shapeable monofilament was cut every 1 m, and five samples were arbitrarily extracted therefrom. A sample for observing a shape of a monofilament cross-section cut out in a direction perpendicular to the fiber axis direction of the monofilament was prepared for five extracted samples. These samples are observed using a digital microscope (VHX-500F, manufactured by Keyence Corporation), and the cross-sectional area (hollow part) and hollow part (including the hollow part) of the shapeable monofilament with an area measurement tool The area of each was measured. The measurement was repeated for 5 samples, and the average value of each was calculated. From the calculated monofilament cross-sectional area and hollow area, the area ratio [%] of the hollow part to the cross-sectional area of the shapeable monofilament was calculated by the formula: hollow area / monofilament cross-sectional area × 100.

[Dimension of outermost shape]
The measurement was performed using the sample for observing the shapeable monofilament cross section described in the previous section. The main measurement tool of the digital microscope (same as above) with the longest side of the cross section or the widest part as the maximum width W and the maximum length in the direction perpendicular to the maximum width W as the maximum height H Each was measured with. The measurement was repeated for 5 samples, and the average value of each was calculated. Moreover, the ratio W / H of the maximum width W and the maximum height H was calculated | required from the value.

[Confirmation of hollow part formation]
During spinning of the shapeable monofilament, a sample having a length of 20 m was taken every 500 m, and this sampling operation was repeated 20 times. One of the cut surfaces at both ends of the collected sample is immersed in a water tank filled with water, and 0.5 MPa of pressurized air (hereinafter referred to as compressed air) is fed from the other cut surface. And it is confirmed whether the sent compressed air passes the hollow part of a shapeable monofilament, and a bubble generate | occur | produces from the cut surface of the shapeable monomonofilament immersed in the water tank. When bubbles are generated, it indicates that a hollow portion is formed over the entire length of the sample of 20 m, and when bubbles are not generated, it indicates that the hollow portion is interrupted at any part of the sample. This hollow part formation state confirmation was implemented in all the 20 samples, and it determined on the following references | standards.

○ (Good): Generation of bubbles was observed from the cut surfaces of all 20 samples.
X (Bad): There was a sample in which generation of one or more bubbles was not recognized.

[Bending recovery rate]
Make a set of two loops crossed from the shapeable monofilament, fix the upper loop to the clasp, and load the lower loop with a load (weight [g] of 1/2 the fiber fineness [denier]) By applying for 3 minutes, a pair of pine needle-shaped samples formed at the intersection of the loops is obtained. A sample was collected by cutting the bent portion into a length of about 3 cm, and the bending recovery rate [%] was obtained from the opening angle θ measured after standing for 60 minutes and using the equation: θ / 180 × 100. The number of measurements was 4, and the average value was shown.

[Bundling power]
As shown in FIG. 5, the shapeable monofilament is wound around a round bar 7 having a diameter of 7 mm in a single layer, twisted three times by hand and then pulled out from the round bar 7, and both ends are subjected to a tensile tester ( A tensile test was carried out at a speed of 100 mm / min with fixing to a chuck of Orientec Co., Ltd. (Tensilon RTC-1250A). The maximum load [cN] until the binding was released was taken as the binding force. In addition, in order to evaluate the durability when repeatedly bundling, the bundling force was measured not only for the first bundling but also for the fifth bundling by repeating bundling and unwinding on the same sample. Then, the bundling force retention ratio [%] of five times of bundling was determined by the formula: bundling force of the fifth time / 1st bundling force × 100.

[Examples 1-5, Comparative Examples 1-3]
PET (T301T manufactured by Toray) as a thermoplastic resin and barium sulfate having a weight average particle size of 0.5 μm (hereinafter referred to as Ba sulfate) are mixed as inorganic fine particles, and the mixture is supplied to a biaxial melt extruder and kneaded. A master batch A was prepared by melt-kneading under the conditions of a temperature of 275 ° C., L / D = 30, and a screw rotation speed of 300 rpm.

  After mixing PET (T301T manufactured by Toray) and masterbatch A so as to have the content ratio of inorganic fine particles shown in Table 1, the mixture is supplied to an extruder melt spinning machine and melt-kneaded at a spinning temperature of 280 ° C. A shapeable monofilament was obtained by extruding through a spinneret having the shape of (a) and drawing 2.5 times after cooling.

  Table 1 shows the area ratio of the hollow portion of the obtained shapeable monofilament, the dimensions of the outermost shape, and other evaluation results.

[Example 6, Comparative Example 4]
Master batch B is prepared with PET (T301T manufactured by Toray) and sulfuric acid Ba having a weight average particle diameter of 2.0 μm, and Master Batch C is prepared with PET (T301T manufactured by Toray) and sulfuric acid Ba having a weight average particle diameter of 3.0 μm. did. The other master batch production conditions were the same as in Example 1.

  A shapeable monofilament was obtained in the same manner as in Example 1 except that each master batch was used.

  Table 1 shows the area ratio of the hollow portion of the obtained shapeable monofilament, the dimensions of the outermost shape, and other evaluation results.

[Examples 7 to 11, Comparative Example 5]
A shapeable monofilament was obtained in the same manner as in Example 1 except that a spinneret having a different hollow part size was used.

  Table 2 shows the area ratio of the hollow portion of the obtained shapeable monofilament, the dimensions of the outermost shape, and other evaluation results.

[Examples 12 to 15, Comparative Example 6]
Master batch D with PET (T301T manufactured by Toray) and calcium carbonate having a weight average particle diameter of 1.2 μm (hereinafter referred to as Ca carbonate), and silica having a weight average particle diameter of 0.5 μm with PET (T301T manufactured by Toray) A master batch E was prepared. The other master batch production conditions were the same as in Example 1.

  The master batches A, D and E were used for melt spinning by mixing with PET (Toray T301T) so as to have the inorganic fine particle content shown in Table 3, and the spinneret shown in FIG. A shapeable monofilament was obtained in the same manner as in Example 1 except that the shape was used.

  Table 3 shows the area ratio of the hollow part of the obtained shapeable monofilament, the dimensions of the outermost shape, and other evaluation results.

[Example 16]
PBT ("Toraycon" (registered trademark) 1100SW manufactured by Toray) and barium sulfate having a weight average particle diameter of 0.5 µm (hereinafter referred to as Ba sulfate) are mixed, and the mixture is supplied to a biaxial melt extruder and kneaded. A master batch F was prepared by melt-kneading under the conditions of a temperature of 235 ° C., L / D = 30, and a screw rotation speed of 300 rpm.

  PBT ("Toraycon" (registered trademark) 1100SW manufactured by Toray) and masterbatch F were mixed so as to have the inorganic fine particle content shown in Table 3, and supplied to an extruder melt spinning machine at a spinning temperature of 235 ° C. After melt-kneading, it was extruded through a spinneret having the shape shown in FIG. 2B, and after cooling, it was stretched 2.5 times to obtain a shapeable monofilament.

  Table 3 shows the area ratio of the hollow part of the obtained shapeable monofilament, the dimensions of the outermost shape, and other evaluation results.

[Example 17]
PPS (Toray E2080) and barium sulfate having a weight average particle diameter of 0.5 μm (hereinafter referred to as “sulfuric acid Ba”) are mixed, and the mixture is fed to a twin-screw melt extruder, kneading temperature 295 ° C., L / D = 30, melt kneading was performed under the conditions of a screw rotation speed of 300 rpm, and a master batch F was produced.

  PPS (Toray E2080) and masterbatch F were mixed so as to have a content ratio of inorganic fine particles shown in Table 3, and supplied to an extruder melt spinning machine. After melt-kneading at a spinning temperature of 300 ° C., FIG. Extrusion was performed through a spinneret having the shape of (b), and after cooling, it was stretched 2.5 times to obtain a shapeable monofilament.

  Table 3 shows the area ratio of the hollow part of the obtained shapeable monofilament, the dimensions of the outermost shape, and other evaluation results.

  As is apparent from Tables 1 to 3, the shapeable monofilaments of the present invention (Examples 1 to 15) have excellent shapeability and are excellent in binding power, and can be used as they are as a binding material, It is suitable for use as a part of a binding material.

  On the other hand, as monofilaments that do not satisfy the conditions of the present invention, in Comparative Examples 1 and 2, where the content ratio of the inorganic fine particles is less than the scope of the present invention, the formability is insufficient and the binding force is inferior, It was inferior in durability when repeatedly bound. In Comparative Example 3 in which the content ratio of the inorganic fine particles exceeds the range of the present invention and Comparative Example 4 in which the weight average particle size of the inorganic fine particles is larger than that of the present invention, the shapeability is excellent, but the durability against repeated binding is insufficient. there were.

  In Comparative Examples 5 and 6 having no hollow part, neither the formability nor the binding force was sufficient.

  Further, two polyethylene films were laminated using the shapeable monofilament of Example 12 and Comparative Example 6 as a core material to obtain a binding material as shown in FIG.

  The binding material using the shapeable monofilament of Example 12 as the core material had excellent shapeability and excellent binding power. On the other hand, the binding material using the shapeable monofilament of Comparative Example 6 as the core material was insufficient as the binding material because of insufficient binding force.

  Since the shapeable monofilament of the present invention has an excellent shapeability as compared with conventional resin binding materials, it can improve the binding force when used as a binding material. Therefore, the resin binding material using the shapeable monofilament of the present invention can be used with a metal detector, can be used with a microwave oven, has no fear of leakage, does not cause rust, is injured. There are advantages such as being difficult to dispose of, no need for separation at the time of disposal, and weight saving.

  In addition to the binding material, it can be suitably used as a substitute for a wire, for example, for a fruit bag or a core material of clothing.

DESCRIPTION OF SYMBOLS 1 Shapeable monofilament 2 Hollow part 3 Flat part 4 Protrusion part 5 Binding material 6 Resin film 7 Round bar W Maximum width H Maximum height

Claims (7)

It consists of a monofilament formed by melt-spinning a thermoplastic resin composition containing 10 to 60% by mass of inorganic fine particles having a weight average particle diameter of 2 μm or less, and this monofilament has one or more hollow portions in its cross section extending over the entire length in the fiber axis direction. A shapeable monofilament characterized by having. The shapeable monofilament according to claim 1, wherein a cross-sectional area of the hollow portion occupies 1 to 20% with respect to a cross-sectional area of the monofilament. The shapeable monofilament according to claim 1 or 2, wherein the inorganic fine particles are barium sulfate and / or calcium carbonate. The shape-forming monofilament according to any one of claims 1 to 3, wherein the cross-sectional shape of the monofilament is an irregular cross-section in which the ratio of the maximum width W to the maximum height H is 1≤W / H≤15. . The cross-sectional shape of the monofilament is a deformed cross section having a flat portion elongated in the horizontal direction and one or more protrusions protruding from the flat portion in at least one of the vertical and vertical directions. 4. The shapeable monofilament according to any one of 4 above. A binding material using at least a part of the shapeable monofilament according to any one of claims 1 to 4. The binding material according to claim 6, wherein the shapeable monofilament according to any one of claims 1 to 4 is used as a core material, and a resin film is bonded to the outer periphery of the core material.

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