JP2017222419A - Tying material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tying material which can firmly tie a material, which is prevented from being loosened by vibrations, which prevents generation of a chatter noise, and which prevents the material-to-be-tied from being scratched.SOLUTION: In a tying material 1, a body part 2 in which through-holes 41, 42 are formed, and a tongue piece part 3, one end of which is a free end, are integrally formed. The tying material is made of an oriented polyolefin resin sheet with shape retentivity in which both folding return angles θ are 20 degrees or less when five minutes passes after the sheet is released after being folded at an angle of 180 degrees or 90 degrees in a direction perpendicular to a direction of draw and kept as-is for a minute.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a binding material suitable for fixing components to a chassis or a vehicle such as an audio device or a television.

  Conventionally, ropes, strings, and the like have been widely used as binding materials. Recently, various loop binding materials that can be used more easily have been proposed. As the loop-shaped binding material, for example, “a binding material that is formed of a synthetic resin integrally formed body and in which a cylindrical portion is integrally provided at the base of a flexible long band body” (for example, a patent Reference 1)), “A substantially rectangular main body part, a slit hole formed in a substantially central part of the main body part, and extending from one long side of the main body part in a direction substantially orthogonal to the extending direction of the slit hole. A binding band "(for example, refer to Patent Document 2) in which a body portion and a tongue piece portion are integrally formed from a metal plate material has been proposed.

  The loop binding material is widely used because it can easily bind electric wires, tubes, linear steel materials and the like. However, when used to fix components to chassis or vehicles such as audio equipment and television, vibration occurs during use, so the former binding material is made of synthetic resin and has flexibility. There was a risk of loosening and falling off. Further, since the latter binding material is made of a metal, there are drawbacks such as chattering noise caused by vibration generated during use, and damage to the binding material in contact with the metal.

Japanese Patent Laid-Open No. 2000-222604 JP 2005-106119 A

  In view of the above problems, an object of the present invention is to provide a binding material that can be firmly bound and does not loosen due to vibrations, generate chatter noise, or cause damage to the material to be bound.

That is, the present invention
[1] A bundling material in which a body portion in which a through hole is formed and a tongue piece portion having one end portion as a free end are integrally formed, and is 180 degrees or 90 degrees perpendicular to the stretching direction. Bundling characterized by comprising a stretched polyolefin resin sheet having a shape-retaining property where the folding return angle θ is 20 degrees or less when 5 minutes have passed after release after being bent and held for 1 minute. material,
[2] The binding material according to the above [1], wherein a foamed resin sheet is laminated on one side of the stretched polyolefin resin sheet,
[3] The binding material according to the above [1] or [2], wherein the polyolefin resin is a high-density polyethylene resin or polypropylene resin having a weight average molecular weight of 100,000 to 500,000,
[4] The binding material according to the above [1] or [2], wherein the polyolefin resin comprises a high-density polyethylene resin having a weight average molecular weight of 100,000 to 500,000 and an α-olefin resin.
[5] The binding material according to any one of the above [1] to [4], wherein a stretch ratio of the stretched polyolefin resin sheet is 10 to 40 times, and
[6] The linear expansion coefficient of the stretched polyolefin resin sheet is −1.0 × 10 ^{−4 to} 1.0 × 10 ⁻⁴ , wherein any one of the above [1] to [5] It relates to the binding material described.

  The configuration of the binding material of the present invention is as described above, and can be firmly bound. Even when components are fixed to a chassis such as an audio device or a television set, a vehicle such as an automobile or a train, loosening due to vibration or chatter noise is generated. It does not occur or scratches occur in the material to be bound.

It is a top view which shows an example of the binding material of this invention. It is a side surface schematic diagram which shows the use condition of the binding material of this invention. It is a top view which shows the example from which the binding material of this invention differs. It is a side view which shows the example from which the binding material of this invention differs. (A) is a top view which shows an example of the extending | stretching polyolefin resin sheet in this invention, (B) and (C) are side views which show the measuring method of a bending return angle.

  The binding material of the present invention is a binding material in which a main body portion in which a through hole is formed and a tongue piece portion having one end portion as a free end are integrally formed, and in a direction perpendicular to the stretching direction, Folded at 180 degrees or 90 degrees and held for 1 minute, then released, and the bent return angle θ when 5 minutes passed after release is composed of a stretched polyolefin resin sheet having shape retention of 20 degrees or less. Features.

  The above-mentioned stretched polyolefin resin sheet is released after folding the stretched polyolefin resin sheet in a direction perpendicular to the stretching direction at 180 degrees or 90 degrees and holding it for 1 minute, and bending when 5 minutes have passed after release. Both of the return angles θ (hereinafter referred to as “180-degree bending return angle θ” and “90-degree bending return angle θ”) have shape retention of 20 degrees or less, preferably “180 The “degree folding return angle θ” is 20 degrees or less and the “90 degrees folding return angle θ” is 15 degrees or less. If either “180 degree bending return angle θ” or “90 degree bending return angle θ”, especially “90 degree bending return angle θ” exceeds 20 degrees, sufficient shape retention cannot be obtained. Sometimes.

  Next, a method of measuring “180-degree bending return angle θ” will be described with reference to the drawings. FIG. 5 (A) is a plan view showing an example of a stretched polyolefin resin sheet in the present invention, and (B) and (C) are side views showing a method for measuring a bending return angle. In the figure, 5 is a stretched polyolefin resin sheet, which is stretched in the direction of arrow X.

  The measurement of “180-degree bending return angle θ” is performed by first measuring the flat stretched polyolefin resin sheet 5 shown in FIG. 5A along the dotted line 51 perpendicular to the stretching direction X, that is, with respect to the stretching direction. As shown in FIG. 5 (B), it is folded in two at a right angle and folded 180 degrees to form two layers. When the shape is overlapped and held for 1 minute and then released, as shown in FIG. 5C, the overlapped stretched polyolefin resin sheet acts to return to the original shape. When the minute has passed, the angle θ formed by the two layers (the angle at which the stretched polyolefin resin sheet bent 180 degrees returns to its original shape) is measured. This angle θ is “180-degree folding return angle θ”. The measurement method of “90-degree bending return angle θ” is the same as the measurement method of “180-degree bending return angle θ” except that measurement is performed by bending 90 degrees.

  Further, since the binding material of the present invention is to bind the article by bending the stretched polyolefin resin sheet in a loop shape, the stretched polyolefin resin sheet preferably has a higher tensile strength. The breaking strength when pulled in the stretching direction is preferably 30 MPa or more. In the present invention, the tensile strength is measured according to JIS K 7171. That is, a stretched polyolefin resin sheet having a thickness of 0.8 mm and a width of 10 mm is supplied to a Tensilon universal testing machine (for example, “RTC-1250A type” manufactured by Orientec Co., Ltd.) and pulled to break in the stretching direction at a speed of 100 mm / min. Measure the strength.

  As the polyolefin-based resin constituting the stretched polyolefin-based resin sheet, any olefin-based resin having a film forming ability can be used. For example, a high-density polyethylene resin, a medium-density polyethylene resin, a low-density polyethylene resin, a linear low-density Polyethylene resin, polypropylene resin, ethylene-propylene copolymer, ethylene-butene-1 copolymer, ethylene-pentene-1 copolymer, ethylene-hexene-1 copolymer, ethylene-octene-1 copolymer, ethylene -Vinyl acetate copolymer, ethylene- (meth) acrylic acid ester copolymer, ethylene-vinyl chloride copolymer, ethylene-propylene-butene copolymer, etc. are mentioned, and high-density polyethylene resin and polypropylene resin are preferred. used.

  When the weight average molecular weight of the polyolefin resin is less than 100,000, the polyolefin resin becomes brittle, the stretchability is lowered, and a stretched polyolefin resin sheet having sufficient mechanical strength or creep resistance is obtained. On the contrary, when it exceeds 500,000, the melt viscosity becomes high, the hot melt molding processability is lowered, and it becomes difficult to obtain a uniform sheet, and therefore 100,000 to 500,000 is preferable. In the present invention, the weight average molecular weight is a value measured by gel permeation chromatography (GPC).

  The melt mass flow rate (hereinafter referred to as MFR) of the polyolefin resin is preferably from 0.1 to 20 g / 10 minutes, more preferably from 0.2 to 10 g / 10 minutes, which is excellent in film moldability. Note that MFR is an index representing the melt viscosity of a thermoplastic resin specified in JIS K 7210.

When the density of the polyolefin-based resin is reduced, the improvement in mechanical strength is small even when stretched, and the shape retainability is also reduced. When the density is increased, melt molding and stretch molding are difficult, so 0.945 to 0.960 g / cm ³ is preferable, and 0.950 to 0.960 g / cm ³ is more preferable.

  Moreover, a high density polyethylene resin may be used together with an α-olefin resin. The α-olefin resin is a single or copolymer of a C 4-10 α-olefin such as butene-1, pentene-1, hexene-1, octene-1, or a mixture of these homopolymers or copolymers. .

  When the weight average molecular weight of the α-olefin resin is less than 100,000, the α-olefin resin becomes brittle, the stretchability is lowered, and it becomes difficult to obtain a stretched olefin-based sheet having sufficient mechanical strength or creep resistance. On the contrary, if it exceeds 1,000,000, the melt viscosity becomes high, the hot melt molding processability is lowered, and it becomes difficult to obtain a uniform sheet, so 100,000 to 1,000,000 is preferable. In addition, when the weight average molecular weight of a mixture of two or more kinds of α-olefin resins is measured by gel permeation chromatography (GPC), it may have a distribution having two or more peaks. It is the average value.

  The MFR of the α-olefin resin is preferably 0.1 to 1.0 g / 10 minutes, more preferably 0.30 to 0.70 g / 10 minutes, and still more preferably 0.40, which is excellent in film moldability. ~ 0.50 g / 10 min.

If the density of the α-olefin resin is reduced, the improvement in mechanical strength is small even if it is stretched, and the shape retainability is also reduced. If the density is increased, it is difficult to mix with the high-density polyethylene resin and melt molding and stretch molding are difficult. Therefore, 0.935 to 0.960 g / cm ³ is preferable.

  When high density polyethylene resin and α-olefin resin are used in combination, if the amount of α-olefin resin added is small, the tear strength in the TD direction after stretching is small, and it becomes easy to break with parin when bent along the MD direction. If it increases, the stretchability is lowered and the shape retention is lowered. Therefore, it is preferable to comprise 100 parts by weight of a high-density polyethylene resin and 5 to 30 parts by weight of an α-olefin resin.

  When a high density polyethylene resin and an α-olefin resin are used in combination, the high density polyethylene resin and the α-olefin resin are mixed and melt-kneaded to form a sheet. Smaller is preferable.

  Therefore, the MFR of the high-density polyethylene resin is 0.20 to 0.60 g / 10 minutes, the MFR of the α-olefin resin is 0.30 to 0.70 g / 10 minutes, and the α-olefin resin has a high density. The difference in MFR of the polyethylene resin (MFR of α-olefin resin-MFR of high-density polyethylene resin) is preferably 0.10 g / 10 min or less, more preferably MFR of the high-density polyethylene resin is 0.35-0. .45 g / 10 min, and the MFR of the α-olefin resin is 0.40 to 0.50 g / 10 min, and the difference in MFR between the α-olefin resin and the high-density polyethylene resin (the MFR− of the α-olefin resin) The MFR) of the high density polyethylene resin is 0.10 g / 10 min or less.

The density of the high-density polyethylene resin is 0.945 to 0.960 g / cm ³ , and the density of the α-olefin resin is 0.935 to 0.960 g / cm ³ , The difference in the density of the olefin resin (density of the high-density polyethylene resin−density of the α-olefin resin) is preferably ± 0.020 g / cm ³ or less.

  Examples of the stretched polyolefin resin sheet include a stretched polyolefin resin sheet having a shape-retaining property in which the polyolefin resin sheet is uniaxially stretched at a stretch ratio of 5 times or more.

  In this case, the glass fiber, talc, mica, calcium carbonate, magnesium hydroxide, alumina, zinc oxide, magnesium oxide, aluminum hydroxide, silica alumina, titanium oxide, calcium oxide, calcium silicate, basic carbonate are added to the polyolefin resin. It is preferable to add an inorganic filler such as magnesium, carbon fiber, or carbon black.

  The thickness of the polyolefin resin sheet before stretching is not particularly limited, but if it is too thick, stretching becomes difficult. Conversely, if it is too thin, the thickness of the polyolefin resin sheet after stretching becomes too thin. Since shape retention property falls, 0.2-15.0 mm is preferable.

  The stretched polyolefin resin sheet that has been stretched has a stretch ratio of 5 times or more and has shape retention, but is preferably 10 to 40 times. The stretching method may be any conventionally known method, such as a method of stretching while heating with a heater or hot air by a uniaxial stretching method such as a roll uniaxial stretching method or a zone uniaxial stretching method. .

  When stretching uniaxially to a high degree of 10 to 40 times, a multistage uniaxial stretching method in which uniaxial stretching is repeated a plurality of times is preferable. When performing multistage uniaxial stretching, the number of stretching is preferably 2 to 20 times, more preferably 3 to 15 times, still more preferably 4 to 10 times. When performing multi-stage stretching by a roll uniaxial stretching method, it is desirable to install a feeding pinch roll, a take-up pinch roll, and at least one, preferably a plurality of contact rolls that rotate at a constant speed between these rolls. By installing such a contact roll, uniform stretchability is improved and stable stretch molding can be performed.

  The contact roll performs uniaxial stretching by applying a frictional force to the polyolefin resin sheet without being pinched. Further, the contact roll may be connected to the feeding roll and / or the take-up roll by a connecting member made of a gear, a chain, a pulley, a belt, or a combination thereof.

  The uniaxial stretching temperature cannot be uniformly stretched when it is low, and the sheet melts and cuts when it is high. Therefore, the range of “melting point−60 ° C.” to the melting point of the polyolefin resin of the polyolefin resin sheet to be stretched is more preferable, It is “melting point−50 ° C.” to “melting point−5 ° C.” of the polyolefin resin. In the present invention, the melting point refers to the maximum point of the endothermic peak that accompanies melting of the crystal, which is recognized when thermal analysis is performed with a differential scanning calorimeter (DSC).

  In order to improve the dimensional stability of the stretched polyolefin resin sheet, the stretched polyolefin resin sheet may be annealed at a temperature between “melting point−60 ° C.” and melting point of the polyolefin resin. If the annealing temperature is lowered, the dimensional stability will not improve, warping will occur if used for a long time, and if it is raised, the polyolefin resin will dissolve and the orientation will disappear and the tensile modulus, tensile strength, etc. will decrease. It is preferable to anneal at a temperature between the “melting point−60 ° C.” and the melting point of the resin.

  Annealing is a heat treatment in the production line. When annealing, the stretched polyolefin resin sheet is stretched if a large tension is applied, and it is not stretched or shrinks in a very small state. The length of the stretched polyolefin resin sheet in the stretching direction is preferably substantially unchanged, and it is preferable that no pressure is applied to the stretched polyolefin resin sheet. That is, it is preferable to anneal so that the length of the annealed stretched polyolefin resin sheet is 1.0 or less of the length of the stretched polyolefin resin sheet before annealing.

  Accordingly, when the stretched polyolefin resin sheet is continuously annealed while being moved in the heating chamber with a roll such as a pinch roll, the feed rate ratio of the polyolefin resin sheet on the inlet side and the outlet side is 1.0 or less. It is preferable to anneal with setting.

  The heating method at the time of annealing is not particularly limited, and examples thereof include a method of heating with hot air, a heater, a heating plate, hot water or the like. The time for annealing is not particularly limited, and varies depending on the thickness of the stretched polyolefin resin sheet and the annealing temperature, but is generally preferably 10 seconds or more, more preferably 30 seconds to 60 minutes, and still more preferably 1 to 20 Minutes.

  Another preferred stretched polyolefin resin sheet is a stretched polyolefin resin sheet in which a polyolefin resin sheet is rolled at a rolling ratio of 5 times or more and then uniaxially stretched at a total stretching ratio of 10 to 40 times.

  The thickness of the polyolefin-based resin sheet before rolling is not particularly limited, but if it is too thick, stretching becomes difficult, and in the rolling process, a large pressing force is required to crush the polyolefin-based resin sheet with a rolling roll. Take-up force is required, and uniform rolling in the width direction may be difficult due to bending of the rolling roll. Conversely, when too thin, the thickness of the polyolefin resin sheet after rolling becomes too thin and uniform rolling. Is not only difficult, but the rolling rolls may come into contact with each other to shorten the life of the rolling roll, so 0.2 to 15.0 mm is preferable.

  The polyolefin resin sheet is first rolled to a rolling ratio of 5 times or more. However, the rolling temperature cannot be uniformly rolled when the temperature is lowered, and melted and cut when the temperature is high. The range of “melting point −40 ° C.” to the melting point of the olefin resin of the polyolefin resin sheet is more preferable, and more preferably “melting point −30 ° C.” to “melting point −5 ° C.” of the olefin resin.

  If the applied pressure (linear pressure) applied to the polyolefin resin sheet by the rolling roll is too small, it may not be possible to obtain a predetermined rolling magnification, and conversely if it is too large, not only will the bending of the rolling roll occur, Sliding easily occurs between the rolling roll and the raw sheet, and uniform rolling may be difficult. Therefore, the applied pressure is preferably 100 MPa to 3000 MPa, and more preferably 300 MPa to 1000 MPa.

  When the rolling ratio is less than 5 times, the effect of suppressing necking at the time of uniaxial stretching performed later cannot be obtained, high-strength uniaxial stretching cannot be performed, or the uniaxial stretching step Therefore, it is 5 times or more, preferably 7 times or more. Although there is no upper limit of the rolling ratio, the higher the rolling ratio, the more load is applied to the rolling equipment. The rolling magnification is defined as (cross-sectional area of polyolefin resin sheet) / (cross-sectional area of polyolefin resin sheet after rolling), but the width of the polyolefin resin sheet hardly changes before and after rolling. (Thickness of resin sheet) / (thickness of polyolefin resin sheet after rolling).

  The rolled polyolefin resin sheet is then uniaxially stretched at a total stretch ratio of 10 to 40 times. The uniaxial stretching method is not particularly limited, and the above-described uniaxial stretching method may be adopted. Moreover, since the total draw ratio is 10 to 40 times, the uniaxial draw ratio may be determined so that the total draw ratio is within this range in consideration of the rolling ratio. Is not improved, it is preferably 1.3 times or more, more preferably 1.5 times or more, and still more preferably 1.8 times or more. Moreover, although an upper limit is not specifically limited, 4 times or less are preferable, More preferably, it is 3.5 times or less. The total draw ratio is a value obtained by multiplying the rolling ratio and the uniaxial draw ratio.

  Further, another preferred stretched polyolefin resin sheet is a stretched polyolefin resin sheet in which the polyolefin resin sheet is rolled at a rolling ratio of 5 times or more. That is, even without rolling and uniaxially stretching, a stretched polyolefin resin sheet having a shape-retaining property in which both “180-degree folding return angle θ” and “90-degree folding return angle θ” are 20 degrees or less is also provided. It can be suitably used.

  The thickness of the polyolefin resin sheet before rolling is not particularly limited, but if it is too thick, a large pressing force and take-up force are required to crush the polyolefin resin sheet with a rolling roll in the rolling process. Uniform rolling in the width direction may be difficult due to roll bending, etc. Conversely, if it is too thin, the thickness of the polyolefin resin sheet after rolling becomes too thin, making uniform rolling difficult. Since the rolling rolls may come into contact with each other and the life of the rolling roll may be shortened, 0.2 to 15.0 mm is preferable.

  In order to improve the dimensional stability of the stretched polyolefin resin sheet stretched by the stretching method including the rolling step, the stretched polyolefin resin sheet has a melting point of “melting point−60 ° C.” to the melting point of the polyolefin resin, and the rolling temperature. You may anneal at the following temperature.

  If the annealing temperature is lowered, the dimensional stability will not improve, warping will occur if used for a long time, and if it is raised, the polyolefin resin will dissolve and the orientation will disappear and the tensile modulus, tensile strength, etc. will decrease. It is preferable to anneal the resin at a temperature ranging from “melting point −60 ° C.” to the melting point and not higher than the rolling temperature. Other annealing methods are as described above.

  The annealed stretched polyolefin resin sheet may be further aged in the temperature range from 40 ° C. to the melting point of the polyolefin resin. The dimensional stability of the polyolefin resin sheet annealed by aging becomes more excellent.

  Aging is not a continuous treatment in the production line, but it is a relatively long time (minutes, time units) for heat treatment of single-wafers, scrolls, etc., once processed, such as cut winding, of a stretched polyolefin resin sheet. It means to lay down carefully and heat-treat. The aging temperature is the same as that left at room temperature when the temperature is low, and when it is high, it is thermally deformed, so the temperature range is from 40 ° C. to the melting point of the polyolefin resin, and the aging time is not effective in a short time and is too long. Even if an effect does not increase, 12 hours-7 days are preferable.

  If necessary, heat treatment agent, heat resistance improver, light stabilizer, ultraviolet absorber, antioxidant, antistatic agent, impact modifier, antifogging agent, flame retardant, colorant, etc. May be added.

  The stretched polyolefin resin sheet may be a laminated stretched polyolefin resin sheet obtained by laminating two or more of the above stretched polyolefin resin sheets. The stretching directions of the stretched polyolefin resin sheets laminated may be the same or different.

  As a laminated stretched polyolefin resin sheet in which a plurality of stretched polyolefin resin sheets having different stretching directions are laminated, for example, a laminated stretched polyolefin resin in which two stretched polyolefin resin sheets are laminated so that the stretching directions are orthogonal to each other Sheet, laminated stretched polyolefin resin sheet in which three stretched polyolefin resin sheets are laminated by shifting the stretching direction by 60 degrees, and laminate in which four stretched polyolefin resin sheets are laminated by shifting the stretching direction by 45 degrees Examples thereof include a stretched polyolefin resin sheet.

  The stretched polyolefin-based resin sheet has shape retention when bent in a direction perpendicular to the stretching direction, and when two or more stretched polyolefin-based resin sheets having different stretching directions are bonded, two or more stretched polyolefins The shape-retaining property in an arbitrary direction is improved by the stretching direction of the resin-based resin sheet, and the stretched polyolefin-based resin sheet is hardly broken even if the stretching direction and the bending direction of the stretched polyolefin-based resin sheet are the same.

  The method of laminating the stretched polyolefin resin sheet may be any conventionally known method, for example, a method in which the second polyolefin resin sheet is supplied between the stretched polyolefin resin sheets and thermally bonded, Examples thereof include a method in which a second polyolefin resin is melt-extruded and bonded and laminated between stretched polyolefin resin sheets.

  As the second polyolefin resin, since the stretched polyolefin resin sheet is adhered, the same type of polyolefin resin as that constituting the stretched polyolefin resin sheet is preferable. Since it acts as an adhesive when heat-sealing, a polyolefin resin having a melting temperature lower than the melting temperature of the polyolefin resin constituting the stretched polyolefin resin sheet is preferable, and a linear low density polyethylene resin is preferable.

  The thickness of the second polyolefin resin (sheet) is not particularly limited. However, if the thickness is too thin, it is difficult to adhere, and if it is too thick, the shape-retaining property of the stretched polyolefin resin sheet is lowered. It is -150 micrometers, Preferably it is 20-80 micrometers.

  In the above-mentioned laminated stretched polyolefin resin sheet, it was measured by bending it so that it was perpendicular to the stretching direction of at least one stretched polyolefin resin sheet of the laminated stretched polyolefin resin sheets. Both the “angle θ” and the “90-degree folding return angle θ” have shape retention properties of 20 degrees or less.

  Although the thickness of the stretched polyolefin resin sheet is not particularly limited, 0.04 to 2 mm is preferable because shape retention and mechanical strength are reduced when the thickness is reduced. Since the laminated stretched polyolefin resin sheet laminates the above stretched polyolefin resin sheet, it is possible to produce a thick sheet. However, if it is too thick, it becomes difficult to bend and the shape retainability is lowered, so 0.08 to 4.0 mm is preferable. .

The binding material of the present invention is often used in an environment with a temperature change. If the environmental temperature rises after binding, the binding may loosen. Conversely, if the environmental temperature is effective, the binding material is overtightened. Therefore, the stretched polyolefin resin sheet is preferably excellent in dimensional stability due to temperature change. That is, it is preferable that the linear expansion coefficient is small (close to 0), and −1.0 × 10 ^{−4 to} 1.0 × 10 ⁻⁴ is preferable. The linear expansion coefficient was measured by performing TMA measurement in accordance with JIS K7197 in a nitrogen stream at a temperature rising rate of 5 ° C./min and in the range of −10 ° C. to 100 ° C., and using second scan data.

  Next, the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing an example of a binding material 1 according to the present invention, in which 2 is an oval body portion, 3 is a tongue piece portion having a free end portion in the lower end direction (right direction in the figure). is there. The main body portion 2 and the tongue piece portion 3 are made of a stretched polyolefin resin sheet and are integrally formed, and the stretched polyolefin resin sheet is stretched in the X direction. The main body 2 is provided with rectangular through holes 41 and 42 through which the tongue piece 3 can be inserted. The lengths of the through holes 41 and 42 are substantially the same as or slightly longer than the thickness of the tongue piece 3, and the width is the same as or slightly wider than the width of the tongue piece 3, so that the tongue piece 3 can be inserted. ing.

  In order to bind the material to be bound, as shown in FIG. 2, the free end portion of the tongue piece 3 is inserted into the through hole 41 so that the material to be bound is accommodated in the formed loop. By inserting the free end portion of the tongue piece portion 3 into the through hole 42, the material to be bound is firmly fixed.

  FIG. 3 is a plan view showing a different example of the binding material 11 of the present invention. In the figure, 21 is an oval body portion, and 31 is a tongue piece portion having a free end portion in the lower end direction (right direction in the figure). The main body portion 21 and the tongue piece portion 31 are made of a stretched polyolefin resin sheet and are integrally formed, and the stretched polyolefin resin sheet is stretched in the X direction. The main body 21 is provided with a substantially circular through hole 43 into which the tongue piece 31 can be inserted. The diameter of the through-hole 43 is slightly shorter than the width of the tongue piece portion 31, and can be inserted by bending the tongue piece portion 31 into a substantially arcuate cross section.

  Therefore, the tongue piece portion 31 is bent by hand into a substantially circular arc shape, inserted into the through hole 43, the material to be bound is stored in the formed loop, and then the tongue piece portion 31 is released, whereby the material to be bound is obtained. Fix firmly.

  FIG. 4 is a side view showing a different example of the binding material 12 of the present invention. In the figure, 22 is a main body portion, and 32 is a tongue piece portion having a free end portion in the lower end direction (right direction in the figure). The main body portion 22 and the tongue piece portion 32 are made of a stretched polyolefin resin sheet and are integrally formed, and the stretched polyolefin resin sheet is stretched in the X direction. A foamed resin sheet 5 is laminated on one surface of the stretched polyolefin resin sheet.

  In addition, rectangular through holes 44 and 45 through which the tongue piece portion 32 can be inserted are formed in the main body portion 22 so as to penetrate the stretched polyolefin resin sheet and the foamed resin sheet 5. The lengths of the through holes 44 and 45 are substantially the same as or slightly longer than the thickness of the tongue piece 32, and the width is the same as or slightly wider than the width of the tongue piece 32, so that the tongue piece 32 can be inserted. ing.

  The foamed resin sheet 5 has an effect of preventing loosening due to vibration and reducing the occurrence of chatter noise when the material to be bound is fixed to a chassis such as an audio device or a television, and a soft foamed resin sheet is preferable. .

  The foamed resin sheet is not particularly limited, and examples thereof include olefin resin foam sheets such as polyethylene resin and polypropylene resin, styrene resin foam sheets, urethane resin foam sheets, silicon resin foam sheets, and the like. The foaming ratio is 10 to 50 times, and the thickness is 1 to 10 mm.

  Next, examples of the present invention will be described, but the present invention is not limited to the examples.

Example 1
A high-density polyethylene resin having a weight average molecular weight (Mw) of 330,000, MFR of 0.40 g / 10 min, a density of 0.956 g / cm ³ , and a melting point of 135 ° C. is supplied to the same-direction biaxial kneading extruder at a resin temperature of 200 ° C. After melt-kneading, the melt-kneaded product was formed into a sheet having a width of 350 mm and a thickness of 11.3 mm using a calendar molding machine controlled at a roll temperature of 110 ° C. to obtain a polyethylene resin sheet.

  The obtained polyethylene resin sheet was rolled at a rolling magnification of 10.3 times using a rolling molding machine (manufactured by Sekisui Koki Co., Ltd.) heated to 125 ° C. to obtain a rolled polyethylene resin sheet having a width of 350 mm and a thickness of 1.10 mm. It was. The obtained rolled polyethylene resin sheet is subjected to a multistage stretching of 1.72 times in a hot air heating type multistage stretching apparatus heated to 110 ° C., and a stretched polyethylene having a total draw ratio of 18 times, a width of 280 mm, and a thickness of 0.80 mm. A resin sheet was obtained.

  The obtained stretched polyethylene resin sheet was supplied with a pinch roll to a hot air heating tank with a line length of 19.25 m set at 125 ° C. at an inlet speed of 2.75 m / min, and an outlet speed of 2.75 m / min. Set to, and then subjected to primary annealing for 7 minutes, followed by secondary annealing in the same manner to obtain an annealed stretched polyethylene resin sheet, which is then fed to a constant temperature bath at 60 ° C. and aged for 24 hours, An aged stretched polyethylene resin sheet was obtained.

The obtained aged stretched polyethylene resin sheet was cut into a width of 10 mm and a length of 15 cm, and “180-degree folding return angle θ” and “90-degree folding return angle θ” were measured. It was a degree. In addition, the tensile strength at break was 380 MPa, and the linear expansion coefficient was −2 × 10 ⁻⁵ . The linear expansion coefficient of the non-unstretched polyethylene resin sheet was 1.4 × 10 ⁻⁶ .

  The resulting aged stretched polyethylene resin sheet was punched into the shape shown in FIG. 1 to obtain the binding material of the present invention. In addition, the extending | stretching direction was the X direction in FIG. The main body 2 has a width of 20 mm and a length of 25 mm, and the tongue piece 3 is formed in a tongue shape having a free end portion in the downward direction from the main body 2 and has a width of 7 mm and a length of 100 mm. . Further, rectangular through holes 41 and 42 having a length of 1 mm and a width of 8 mm were formed in the main body 2 at intervals of 15 mm.

  As shown in FIG. 2, the tongue piece portion 3 of the binding material 1 was bent with a finger, and the free end portion was inserted into the through holes 41 and 42 to be deformed into a loop shape to prepare a test piece. The obtained test piece is supplied to a Tensilon universal testing machine ("RTC-1250A type" manufactured by Orientec Co., Ltd.), a string is hung on the loop part, and the main body part 2 and the string are pulled up and down at a speed of 300 mm / min. As a result, the tongue piece 3 did not come off the through holes 41 and 42 even at 3 MPa.

(Example 2)
Weight average molecular weight (Mw) 330,000, MFR 0.40 g / 10 min, density 0.956 g / cm ³ , melting point 135 ° C. 100 parts by weight high density polyethylene resin, and MFR 0.45 g / 10 min, density 0.940 g / 10 parts by weight of an α-olefin resin (ethylene-1-hexene copolymer) having a melting point of cm ³ and a melting point of 125 ° C. is supplied to the same-direction biaxial kneading extruder and melt-kneaded at a resin temperature of 200 ° C., and then melt-kneaded. The product was formed into a sheet by a calendar molding machine controlled at a roll temperature of 110 ° C. to obtain an olefin resin sheet having a width of 350 mm and a thickness of 11.3 mm.

  The obtained olefin resin sheet was rolled 10.3 times using a rolling molding machine (manufactured by Sekisui Koki Co., Ltd.) heated to 125 ° C. to obtain a rolled olefin resin sheet. The obtained rolled olefin resin sheet was subjected to uniaxial multistage stretching by 1.72 times using a hot-air heating type multistage stretching apparatus heated to 110 ° C. to obtain a stretched olefin resin sheet having a total draw ratio of 18 times. The stretched olefin resin sheet obtained had a width of 280 mm and a thickness of 0.80 mm.

  The obtained stretched olefin resin sheet is supplied with a pinch roll to a hot air heating tank with a line length of 19.25 m set at 125 ° C. at an inlet speed of 2.75 m / min, and an outlet speed of 2.75 m / min. Set to, and then subjected to primary annealing for 7 minutes, followed by secondary annealing in the same manner to obtain an annealed stretched olefin resin sheet, which is then fed to a constant temperature bath at 60 ° C. and aged for 24 hours, An aged stretched olefin resin sheet was obtained.

The obtained aged stretched olefin resin sheet was cut into a width of 10 mm and a length of 15 cm, and “180-degree folding return angle θ” and “90-degree folding return angle θ” were measured. It was a degree. Moreover, the tensile breaking strength was 400 MPa and the linear expansion coefficient was −3 × 10 ⁻⁵ . The unstretched olefin resin sheet had a linear expansion coefficient of 1.4 × 10 ⁻⁴ .

  The obtained aged stretched olefin resin sheet was punched into the shape shown in FIG. 1 to obtain the binding material of the present invention. In addition, the extending | stretching direction was the X direction in FIG. The main body 2 has a width of 20 mm and a length of 25 mm, and the tongue piece 3 is formed in a tongue shape having a free end portion in the downward direction from the main body 2 and has a width of 7 mm and a length of 100 mm. . Further, rectangular through holes 41 and 42 having a length of 1 mm and a width of 8 mm were formed in the main body 2 at intervals of 15 mm.

  As shown in FIG. 2, the tongue piece portion 3 of the binding material 1 was bent with a finger, and the free end portion was inserted into the through holes 41 and 42 to be deformed into a loop shape to prepare a test piece. The obtained test piece is supplied to a Tensilon universal testing machine ("RTC-1250A type" manufactured by Orientec Co., Ltd.), a string is hung on the loop part, and the main body part 2 and the string are pulled up and down at a speed of 300 mm / min. As a result, the tongue piece 3 did not come off the through holes 41 and 42 even at 3 MPa.

(Example 3)
A high-density polyethylene resin having a weight average molecular weight (Mw) of 330,000, MFR of 0.40 g / 10 min, a density of 0.956 g / cm ³ , and a melting point of 135 ° C. is supplied to the same-direction biaxial kneading extruder at a resin temperature of 200 ° C. After melt-kneading, the melt-kneaded product was formed into a sheet having a width of 350 mm and a thickness of 3.8 mm using a calendar molding machine controlled at a roll temperature of 110 ° C. to obtain a polyethylene resin sheet.

  The obtained polyethylene resin sheet was rolled at a rolling magnification of 10.3 times using a rolling molding machine (manufactured by Sekisui Koki Co., Ltd.) heated to 125 ° C. to obtain a rolled polyethylene resin sheet having a width of 350 mm and a thickness of 0.37 mm. It was. The obtained rolled polyethylene resin sheet was subjected to a multistage stretching of 1.71 times in a hot air heating type multistage stretching apparatus heated to 110 ° C., and a stretched polyethylene having a total draw ratio of 18 times, a width of 280 mm, and a thickness of 0.27 mm. A resin sheet was obtained.

  The obtained stretched polyethylene resin sheet was supplied with a pinch roll to a hot air heating tank with a line length of 19.25 m set at 125 ° C. at an inlet speed of 2.75 m / min, and an outlet speed of 2.75 m / min. Set to, and then subjected to primary annealing for 7 minutes, followed by secondary annealing in the same manner to obtain an annealed stretched polyethylene resin sheet, which is then fed to a constant temperature bath at 60 ° C. and aged for 24 hours, An aged stretched polyethylene resin sheet was obtained.

  The obtained four aged stretched polyethylene resin sheets were overlapped so that the stretching directions of adjacent sheets were substantially orthogonal to each other, and a linear low density polyethylene film having a thickness of 30 μm was laminated therebetween, and a press machine Was pressed at 120 ° C. and 4.4 MPa for 20 minutes to obtain a laminated stretched polyethylene resin sheet having a thickness of 1.17 mm.

The obtained laminated stretched polyethylene resin sheet was cut into a width of 10 mm and a length of 15 cm, and “180 ° folding return angle θ” and “90 ° folding return” were orthogonal to the stretching direction of the topmost stretched polyethylene resin sheet. When the “angle θ” was measured, it was 5 degrees to 10 degrees, respectively. Moreover, the tensile strength at break of the laminated stretched polyethylene resin sheet was 200 MPa, and the linear expansion coefficient was −2 × 10 ⁻⁵ .

  A foamed polyethylene resin sheet having an expansion ratio of 40 times and a thickness of 0.2 mm was adhered to one surface of the obtained laminated stretched polyethylene resin sheet with an acrylic pressure-sensitive adhesive to obtain a laminated sheet. The obtained laminated sheet was cut into a width of 10 mm and a length of 15 cm, and “180-degree folding return angle θ” and “90-degree folding return angle θ” were orthogonal to the stretching direction of the uppermost stretched polyethylene resin sheet. Were measured to be 7 to 12 degrees, respectively.

  The obtained laminated sheet was punched into the shape shown in FIG. 1 to obtain the binding material shown in FIG. The stretching direction of the uppermost stretched polyethylene resin sheet was the X direction. The main body portion 22 has a width of 20 mm and a length of 25 mm, and the tongue piece portion 32 is formed in a tongue shape having a free end portion in the downward direction from the main body portion 22 and has a width of 7 mm and a length of 100 mm. . Further, rectangular through holes 44 and 45 having a length of 1.6 mm and a width of 8 mm were formed in the main body portion 22 at intervals of 15 mm.

  As shown in FIG. 2, the tongue piece portion 32 of the binding material 12 was bent with a finger, and the free end portion was inserted into the through holes 44 and 45 so as to be deformed into a loop shape to prepare a test piece. The obtained test piece is supplied to a Tensilon universal testing machine ("RTC-1250A type" manufactured by Orientec Co., Ltd.), a string is hung on the loop part, and the main body part 22 and the string are pulled up and down at a speed of 300 mm / min. As a result, the tongue piece 32 did not come off the through holes 44 and 45 even at 3 MPa.

  Similarly, when 5 wires are bundled with the binding material 12 and the foamed polyethylene resin sheet is screwed to the chassis of the television so that the polyethylene resin sheet is on the chassis side, the television is turned on. There was no loosening due to vibration or no chatter noise.

  The binding material of the present invention can be firmly bound, and does not loosen due to vibration, does not generate chatter, and does not cause damage to the material to be bound. It can be used suitably for doing.

DESCRIPTION OF SYMBOLS 1 Bundling material 2 Body part 3 Tongue piece part 4 Through-hole 5 Stretched polyethylene resin sheet

Claims (6)

  A bundling material in which a body part in which a through-hole is formed and a tongue piece part with one end being a free end are integrally formed, and folded at 180 degrees or 90 degrees in a direction perpendicular to the stretching direction. A binding material comprising a stretched polyolefin resin sheet that is bent and held for 1 minute and then released, and has a shape-retaining property with a folding return angle θ of 20 degrees or less when 5 minutes have passed after release.   The binding material according to claim 1, wherein a foamed resin sheet is laminated on one surface of the stretched polyolefin resin sheet.   The binding material according to claim 1 or 2, wherein the polyolefin resin is a high-density polyethylene resin or polypropylene resin having a weight average molecular weight of 100,000 to 500,000.   The binding material according to claim 1 or 2, wherein the polyolefin resin comprises a high-density polyethylene resin having a weight average molecular weight of 100,000 to 500,000 and an α-olefin resin.   The binding material according to any one of claims 1 to 4, wherein a stretch ratio of the stretched polyolefin resin sheet is 10 to 40 times. 6. The binding material according to claim 1, wherein the stretched polyolefin resin sheet has a linear expansion coefficient of −1.0 × 10 ^{−4 to} 1.0 × 10 ⁻⁴ .

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