JP2014068960A - Hook for suspension - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hook for suspension, which is plate-like not to be bulky so that storage and transport can be facilitated, whose fixed part can be deformed to an arbitrary shape to be installed at a part of an arbitrary shape and easily change the installation position, whose shape of the hook part can be deformed to be suspended according to the load of an article having a load within a certain range, and which can prevent a person or an object from being caught in the hook part to disturb or hurt the person.SOLUTION: In a hook for suspension, a plate-like fixed part and a tongue-like hook part having a free end at the lower end direction area are integrally formed. The hook is formed by a draw polyolefin resin sheet which is bent at a 180-degree or 90-degree angle to be orthogonal to the drawing direction, held for one minute and then released, and in the lapse of five minutes after the releasing has shape retention so that the bending return angle θ is 20 degrees or less. The drawing direction of the draw polyolefin resin sheet and the lengthwise direction of the hook part are substantially the same.

Description

  The present invention relates to a hanging hook for hanging relatively lightweight articles such as a calendar, a sheet for posting, and a key in a living room, a kitchen, a bathroom, and the like.

  Conventionally, in order to organize and store relatively lightweight items such as calendars, bulletin sheets, keys, etc. in living rooms, kitchens, bathrooms, etc., a metal fishing ring is used at the lower end of the plate-shaped fixing part made of synthetic resin. However, the hook is designed to project from the fixed part in a direction substantially perpendicular to the fixed part, and the hanging hook has a three-dimensional structure. However, it is bulky and inconvenient for storage and transportation. In addition, after installing a hanging hook on a wall or the like, there are disadvantages such as a person or an object getting caught in a hook portion protruding when not in use, and getting injured.

  In order to eliminate the above drawbacks, various types of hanging hooks have been proposed that can be flat when not in use and can project a hook portion when used. For example, “Adhesive layer is formed entirely or partially on the back side of a plate-like material such as a synthetic resin plate, metal plate, hard paper, etc., and the release sheet is adhered to the adhesive layer so that the release sheet can be peeled off. A hanging hook plate characterized in that a projecting portion that can project in a hook shape is formed "(see, for example, Patent Document 1).

  The plate in the hanging hook plate is a synthetic resin plate, a metal plate, hard paper, etc., and can be easily fixed on a flat surface, but it is difficult to fix it on a corner such as an uneven surface or a heel. Even if it could be fixed, it could not be fixed by fixing it to uneven surfaces or corners of different shapes. In addition, the protruding portion protrudes in a hook shape through the cut and crease, that is, the protruding portion is bent and protruded so that a cut part of the plate-like body is perpendicular to the plate-like body. Since it is formed, only articles having a specific structure can be suspended, and it has not been possible to change the shape to suit the weight, thickness, etc. of the article to be suspended.

JP 2002-45290 A

  In view of the above problems, the object of the present invention is plate-like and not bulky, and can be easily stored and transported. The fixing part can be deformed into an arbitrary shape, can be installed in an arbitrary shape, and the installation position can be easily changed. The hook part can be deformed and hung according to the load of an article having a certain range of load, and a person or object can get caught in the hook part and get injured. There is no hanging hook to provide.

That is, the present invention
[1] A hanging hook in which a plate-like fixing portion and a tongue-like hook portion having a free end portion in the lower end direction are integrally formed, and 180 ° or 90 ° so as to be perpendicular to the extending direction. It is made up of a stretched polyolefin resin sheet that has a shape retaining property with a folding return angle θ of 20 degrees or less when 5 minutes have passed after release. The hanging hook, wherein the extending direction of the hook portion and the length direction of the hook portion are substantially the same,
[2] The hanging hook according to the above [1], wherein an adhesive layer or a magnet layer is laminated on the back surface of the fixed portion, and
[3] Stretched polyolefin resin sheet is a stretched polyolefin resin sheet having a weight average molecular weight of 100,000 to 500,000, uniaxially stretched to a total stretch ratio of 10 to 40 times after being rolled to a rolling ratio of 5 times or more. The present invention relates to the hanging hook according to the above [1] or [2], which is a polyolefin resin sheet.

  The structure of the hanging hook of the present invention is as described above, and it is plate-like and is not bulky and can be easily stored and transported. Further, since the fixing portion can be deformed into an arbitrary shape and can be held in the deformed shape, the fixing portion can be installed in a portion having an arbitrary shape, and the installation position can be easily changed. Furthermore, the hook part can be deformed and hung in accordance with the load of an article having a certain range of load, and a person or an object may get caught in the hook part or get injured. Absent.

(A) is a top view which shows an example of the hook for suspension of this invention, (b) is a side view. It is a side view which shows the use condition of the hook for suspension of this invention. It is a top view which shows the example from which the hook for suspension of this invention differs.

  The hanging hook of the present invention is a hanging hook in which a plate-like fixing portion and a tongue-like hook portion having a free end portion in the lower end direction are integrally formed, and are perpendicular to the extending direction. It is made of a stretched polyolefin resin sheet that has a shape-retaining property with a folding return angle θ of 20 degrees or less when 5 minutes have passed after the release, after being bent and held at 180 degrees or 90 degrees for 1 minute. The extending direction of the stretched polyolefin resin sheet and the length direction of the hook portion are substantially the same.

  The above-mentioned stretched polyolefin resin sheet is released after bending the stretched polyolefin resin sheet at 180 degrees or 90 degrees so as to be perpendicular to the stretching direction and holding it for 1 minute, and then folding back when 5 minutes have passed after release. Both of the angles θ have shape retention of 20 degrees or less.

  The shape retention of the stretched polyolefin resin sheet is as follows: when the stretched polyolefin resin sheet is bent at 180 degrees or 90 degrees so as to be perpendicular to the stretching direction and held for 1 minute, then released, and when 5 minutes have passed since release. Are both 20 degrees or less, preferably the 180-degree folding return angle θ is 20 degrees or less and the 90-degree folding return angle θ is 15 degrees or less. If one of the bending return angles θ at the time of 180-degree and 90-degree bending, particularly the 90-degree bending return angle θ exceeds 20 degrees, sufficient shape retention may not be obtained.

  In addition, since the stretched polyolefin-based resin sheet is bent to form a hook part and the article suspended from the hook part is suspended, the effect of suspending decreases when the bending strength of the stretched polyolefin-based resin sheet is reduced. The bending strength when the stretched polyolefin resin sheet is bent at right angles to the stretching direction is preferably 30 MPa or more. In the present invention, the bending strength is measured according to JIS K 7171. That is, a stretched polyolefin resin sheet having a width of 10 mm is supplied to a Tensilon universal testing machine (for example, “RTC-1250A type” manufactured by Orientec Co., Ltd.) and held at a distance between fulcrums of 30 mm. Measurement is performed by bending at a speed of 1 mm / min so as to form a right angle.

  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 ester copolymer, ethylene-vinyl chloride copolymer, ethylene-propylene-butene copolymer, etc. 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 and the stretchability is lowered, or 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 index (hereinafter referred to as MI) 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. It is. MI is an index representing the melt viscosity of a thermoplastic resin specified in JIS K 7210. Further, in the case of a high-density polyethylene resin, 0.94 g / cm 3 or more is preferable because the mechanical strength does not improve even if the density is reduced even if the density is reduced.

  As the stretched polyolefin resin sheet, a stretched polyolefin resin sheet having a shape-retaining property in which a polyolefin resin sheet having a weight average molecular weight of 100,000 to 500,000 is uniaxially stretched at a stretch ratio of 5 times or more is preferable.

  In this case, the polyolefin resin is preferably a high-density polyethylene resin having an intrinsic viscosity [η] of less than 3.5 dl / g, such as glass fiber, talc, mica, calcium carbonate, magnesium hydroxide, alumina, zinc oxide, magnesium oxide, It is preferable to add inorganic machine fillers such as aluminum hydroxide, silica alumina, titanium oxide, calcium oxide, calcium silicate, basic magnesium carbonate, carbon fiber, and 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 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.

  Further, as a different preferred stretched polyolefin resin sheet, a polyolefin resin sheet having a weight average molecular weight of 100,000 to 500,000 was rolled to a rolling ratio of 5 times or more, and then the total stretching ratio was uniaxially stretched to 10 to 40 times. A stretched polyolefin resin sheet may be mentioned.

  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. 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).

  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.

  Another preferred stretched polyolefin resin sheet is a stretched polyolefin resin sheet obtained by rolling a polyolefin resin sheet having a weight average molecular weight of 100,000 to 500,000 to a rolling ratio of 5 times or more. That is, even if it is not uniaxially stretched only by rolling, it is released after being bent at 180 degrees and 90 degrees and held for 1 minute, and the folding return angle θ when 5 minutes have elapsed after release is both 20 degrees or less. A stretched polyolefin resin sheet having shape retention can also 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.

  The laminated stretched polyolefin resin sheet is also bent at 180 degrees and 90 degrees so as to be perpendicular to the stretching direction of at least one stretched polyolefin resin sheet of the laminated stretched polyolefin resin sheets. It is released after being held for a minute, and has a shape-retaining property in which the folding return angle θ is 5 degrees or less when 5 minutes have passed after the release.

  The thickness of the stretched polyolefin resin sheet is not particularly limited, but is preferably 0.04 to 2 mm because the shape retainability decreases as the thickness decreases. 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. .

  Next, the present invention will be described with reference to the drawings. FIG. 1A is a plan view showing an example of a hanging hook according to the present invention, and FIG. In the figure, 1 is a substantially rectangular fixing portion, and 2 is a tongue-like hook portion having a free end portion in the lower end direction. The fixed part 1 and the hook part 2 are integrally formed by punching out the above-mentioned stretched polyolefin resin sheet. In addition, the extending | stretching direction of the extending | stretching polyolefin-type resin sheet is an up-down direction in FIG. In addition, an adhesive layer 3 is laminated on the back surface of the fixing part 1, and a release paper 4 is laminated on the adhesive layer 3. When the hanging hook is used, the release paper 4 is peeled off and adhered. The agent layer 3 can be fixed by pressing it at a predetermined position.

  The pressure-sensitive adhesive is not particularly limited, and any conventionally known pressure-sensitive adhesive can be used. Examples thereof include a rubber-based pressure-sensitive adhesive, an acrylic pressure-sensitive adhesive, a silicon-based pressure-sensitive adhesive, and a urethane-based pressure-sensitive adhesive. The pressure-sensitive adhesive layer is formed by applying and drying the pressure-sensitive adhesive on the back surface of the fixed portion 1. The pressure-sensitive adhesive layer may be formed by sticking a double-sided pressure-sensitive adhesive tape manufactured with the above-mentioned pressure-sensitive adhesive to the back surface of the fixing portion 1.

  Further, by laminating a magnetic layer instead of the pressure-sensitive adhesive layer, it can be fixed to iron furniture, electrical products and the like. Even if an adhesive layer or a magnetic layer is not laminated on wood or a wall board, it can be easily fixed with a push pin or a wood screw.

  FIG. 2 is a side view showing a usage state of the hanging hook of the present invention. As shown in (a), when the hook part 2 is bent in a semicircular shape, the hook part 2 has a shape retaining property, so that the bent shape can be maintained and the article can be suspended. The hook portion 2 may be deformed into an arbitrary shape according to the article to be suspended, and a heavier article can be suspended by being deformed into a V shape as shown in (b).

  FIG. 3 is a plan view showing another example of the hanging hook according to the present invention. In the figure, 1 is a substantially rectangular fixing part, which is formed by punching out the above-mentioned stretched polyolefin resin sheet. In addition, the extending | stretching direction of the extending | stretching polyolefin-type resin sheet is an up-down direction in FIG. Reference numeral 2 denotes a tongue-shaped hook portion having a free end portion in the lower end direction, which is formed by punching out a substantially central portion of the fixing portion 1 in a tongue shape.

  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 (manufactured by Nippon Polyethylene Co., Ltd.) having a weight average molecular weight (Mw) of 330,000 and a melting point of 135 ° C. is supplied to the same-direction biaxial kneading extruder (manufactured by Plastic Engineering Laboratory) and melt kneaded at a resin temperature of 200 ° C. After that, the melt-kneaded material was formed into a sheet having a width of 350 mm and a thickness of 11.3 mm using a calender molding machine in which the roll temperature was controlled at 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 was subjected to a multistage stretching of 1.72 times in a hot air heating type multistage stretching apparatus (manufactured by Kyowa Engineering) heated to 110 ° C., a total stretching ratio of 18 times, a width of 280 mm, and a thickness of 0 An 80 mm stretched polyethylene 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 stretched polyethylene resin sheet was cut into a width of 10 mm and a length of 15 cm, bent at 180 degrees and 90 degrees so as to be orthogonal to the stretching direction of the stretched polyethylene resin sheet, held for 1 minute, and then released. When the bending return angle θ was measured when minutes passed, it was 4 to 7 degrees, respectively. The bending strength was 70 MPa.

  The obtained stretched polyethylene resin sheet was punched into the shape shown in FIG. 1 (a) to obtain the hanging hook of the present invention. In addition, the extending | stretching direction was the up-down direction in FIG. The fixed portion 1 has a width of 20 mm and a length of 15 mm, and the hook portion 2 is formed in a tongue shape having a free end portion in the downward direction from the central portion of the lower end of the fixed portion 1. The width is 7 mm and the length is 15 mm. Met.

  The hook part 2 was bent with a finger and deformed into a substantially semicircular shape as shown in FIG. The obtained test piece is supplied to a Tensilon universal testing machine ("RTC-1250A type" manufactured by Orientec Co., Ltd.), a string is hooked on the hook part 2, and the fixing part 1 and the string are pulled up and down at a speed of 300 mm / min. When tested, the string came off at 3 MPa.

  Further, as shown in FIG. 2B, the hook portion 2 was folded 180 degrees and deformed 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 hooked on the hook part 2, and the fixing part 1 and the string are pulled up and down at a speed of 300 mm / min. When tested, the string came off at 6 MPa.

(Example 2)
A high-density polyethylene resin (manufactured by Nippon Polyethylene Co., Ltd.) having a weight average molecular weight (Mw) of 330,000 and a melting point of 135 ° C. is supplied to the same-direction biaxial kneading extruder (manufactured by Plastic Engineering Laboratory) and melt kneaded at a resin temperature of 200 ° C. After that, the melt-kneaded material was formed into a sheet having a width of 350 mm and a thickness of 5.6 mm by a calender molding machine in which the roll temperature was controlled at 110 ° C. to obtain a polyethylene resin sheet.

  The obtained polyethylene resin sheet was rolled to 10.2 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 0.55 mm. It was. The obtained rolled polyethylene resin sheet was subjected to a multistage stretching of 1.72 times in a hot air heating type multistage stretching apparatus (manufactured by Kyowa Engineering) heated to 110 ° C., a total stretching ratio of 18 times, a width of 280 mm, and a thickness of 0 A 40 mm stretched polyethylene 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. 1 second annealing for 7 minutes, followed by secondary annealing in the same manner to obtain an annealed stretched polyethylene resin sheet, and then the constant temperature at 60 ° C. is 40 mm and the length is 30 mm. The portion 2 is formed in a tongue shape having a free end portion in the downward direction from the lower end central portion of the fixed portion 1, and has a width of 10 mm and a length of 30 mm.

  The hook part 2 is bent with a finger and deformed into a substantially semicircular shape as shown in FIG. 2 (a), and the test piece is supplied to a warm bath and aged for 24 hours. Obtained.

  The obtained stretched polyethylene resin sheet was cut into a width of 10 mm and a length of 15 cm, bent at 180 degrees and 90 degrees so as to be orthogonal to the stretching direction of the stretched polyethylene resin sheet, held for 1 minute, and then released. When the bending return angle θ was measured when minutes passed, it was 4 to 7 degrees, respectively. The bending strength was 45 MPa.

  The obtained stretched polyethylene resin sheet was punched into the shape shown in FIG. 1 (a) to obtain the hanging hook of the present invention. In addition, the extending | stretching direction was the up-down direction in FIG. The width of the fixed part 1 was created. The obtained test piece is supplied to a Tensilon universal testing machine ("RTC-1250A type" manufactured by Orientec Co., Ltd.), a string is hooked on the hook part 2, and the fixing part 1 and the string are pulled up and down at a speed of 300 mm / min. When tested, the string came off at 1 MPa.

  Further, as shown in FIG. 2B, the hook portion 2 was folded 180 degrees and deformed 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 hooked on the hook part 2, and the fixing part 1 and the string are pulled up and down at a speed of 300 mm / min. When tested, the string came off at 2 MPa.

(Example 3)
A high-density polyethylene resin (manufactured by Nippon Polyethylene Co., Ltd.) having a weight average molecular weight (Mw) of 330,000 and a melting point of 135 ° C. is supplied to the same-direction biaxial kneading extruder (manufactured by Plastic Engineering Laboratory) and melt kneaded at a resin temperature of 200 ° C. Thereafter, the melt-kneaded product was formed into a sheet having a width of 350 mm and a thickness of 2.5 mm by a calender molding machine in which the roll temperature was controlled at 110 ° C. to obtain a polyethylene resin sheet.

  The obtained polyethylene resin sheet was rolled to 9.3 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 0.27 mm. It was. The obtained rolled polyethylene resin sheet was subjected to a multi-stage stretching of 1.69 times using a hot-air heating type multi-stage stretching apparatus (manufactured by Kyowa Engineering Co., Ltd.) heated to 110 ° C., a total stretching ratio of 16 times, a width of 280 mm, and a thickness of 0 A 20 mm stretched polyethylene 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 four stretched polyethylene resin sheets obtained 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 between them, and 120 presses were used. The laminated stretched polyethylene resin sheet having a thickness of 0.89 mm was obtained by pressing for 20 minutes under the conditions of 4.4 ° C. and 4.4 ° C.

  The obtained laminated stretched polyethylene resin sheet was cut into a width of 10 mm and a length of 15 cm, bent at 180 degrees and 90 degrees so as to be orthogonal to the stretching direction of the topmost stretched polyethylene resin sheet, held for 1 minute, and then released. The bending return angle θ after 5 minutes from the release was measured and found to be 5 degrees to 10 degrees, respectively. The bending strength of the laminated stretched polyethylene resin sheet was 50 MPa.

  The obtained laminated stretched polyethylene resin sheet was punched into the shape shown in FIG. 1 (a) to obtain the hanging hook of the present invention. In addition, the extending | stretching direction was the up-down direction in FIG. The fixed portion 1 has a width of 25 mm and a length of 20 mm, and the hook portion 2 is formed in a tongue shape having a free end portion in the downward direction from the central portion of the lower end of the fixed portion 1. The width is 5 mm and the length is 15 mm. Met.

  The hook part 2 was bent with a finger and deformed into a substantially semicircular shape as shown in FIG. The obtained test piece is supplied to a Tensilon universal testing machine ("RTC-1250A type" manufactured by Orientec Co., Ltd.), a string is hooked on the hook part 2, and the fixing part 1 and the string are pulled up and down at a speed of 300 mm / min. When tested, the string came off at 2 MPa.

  Further, as shown in FIG. 2B, the hook portion 2 was folded 180 degrees and deformed 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 hooked on the hook part 2, and the fixing part 1 and the string are pulled up and down at a speed of 300 mm / min. When tested, the string came off at 5 MPa.

  Since the hanging hook of the present invention can suspend a relatively light article, it can be suitably used at home, office, factory and the like.

DESCRIPTION OF SYMBOLS 1 Fixing part 2 Hook part 3 Adhesive layer 4 Release paper

Claims (3)

  A hanging hook in which a plate-like fixing portion and a tongue-like hook portion having a free end portion in the lower end direction are integrally formed, and folded at 180 degrees or 90 degrees so as to be perpendicular to the extending direction. Bending and holding for 1 minute and then releasing, and the bending return angle θ when 5 minutes have passed after release is a stretched polyolefin resin sheet having a shape retaining property of 20 degrees or less, and the stretching direction of the stretched polyolefin resin sheet The hook for hanging is characterized in that the length direction of the hook portion is substantially the same.   2. The hanging hook according to claim 1, wherein an adhesive layer or a magnet layer is laminated on the back surface of the fixed portion.   The stretched polyolefin resin sheet is a stretched polyolefin resin in which a polyolefin resin sheet having a weight average molecular weight of 100,000 to 500,000 is rolled to a rolling ratio of 5 times or more and then uniaxially stretched to a total stretching ratio of 10 to 40 times. 3. The hanging hook according to claim 1, wherein the hanging hook is a sheet.

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