JP2008215043A - Slat for blind - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lightweight slat for blind excellent in mechanical strength, shock-resistance, weather durability or the like while it can be used safely without causing electric-wave disturbance. <P>SOLUTION: A thermoplastic polyester resin sheet in an amorphous state is drawn out and stretched at a temperature from the glass transition temperature of the thermoplastic polyester resin -20°C to the glass transition temperature of the thermoplastic polyester resin +20°C Then, the sheet is uniaxially stretched at a temperature higher than the temperature for drawing-out and stretching. On the both sides of the stretched thermoplastic polyester resin sheet thus obtained thermoplastic resin layers are laminated. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a blind slat installed on the inner surface of an opening such as a window of a building for the purpose of sunshade and blindfolding.

Conventionally, blinds have been installed on the inner surfaces of openings such as windows of buildings for the purpose of sunshading and blindfolding. The blind is generally composed of a plurality of light shielding plates (slats) made of thin rectangular plates connected in the vertical direction between the head box and the bottom rail with a ladder cord, and the slats are configured to be movable up and down and angle-adjustable by the operation cord. Is. And the slat was manufactured with plastic base materials, such as an aluminum plate, an acrylic resin, and a vinyl chloride resin (for example, refer patent document 1, 2).
JP-A-9-328975 Japanese Patent Laid-Open No. 10-46952

  Aluminum slats are the most widely used, but they can cause radio interference, especially for mobile phones. In addition, aluminum slats have low mechanical strength and are easy to bend due to impact, and have safety problems such as cutting their hands. Plastic slats such as acrylic resin and vinyl chloride resin have the disadvantage that they are deformed and bent by direct sunlight and their own weight when suspended for a long time.

  In view of the above-described drawbacks, an object of the present invention is to provide a blind slat that is light in weight, excellent in mechanical strength, impact resistance, weather resistance, and the like and can be used safely without causing radio interference.

  The blind slat according to claim 1, wherein the thermoplastic polyester resin sheet in an amorphous state is a temperature between a glass transition temperature of the thermoplastic polyester resin of -20 ° C and a glass transition temperature of the thermoplastic polyester resin of + 20 ° C. A thermoplastic resin layer is laminated on both sides of a stretched thermoplastic polyester-based resin sheet obtained by uniaxial stretching at a temperature higher than the drawing temperature after the drawing.

  The stretched thermoplastic polyester resin sheet used in the present invention comprises an amorphous thermoplastic polyester resin sheet, a glass transition temperature of the thermoplastic polyester resin of −20 ° C. to a glass transition of the thermoplastic polyester resin. After drawing and stretching between a pair of rolls at a temperature of + 20 ° C., the film is obtained by uniaxial stretching at a temperature higher than the temperature of the roll.

  Examples of the thermoplastic polyester resin used in the present invention include polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyglycolic acid, poly (L-lactic acid), poly (3-hydroxybutyrate), poly ( 3-hydroxybutyrate / hydroxyvalerate), poly (ε-caprolactone), polyethylene succinate, polybutylene succinate, polybutylene succinate adipate, polybutylene succinate / lactic acid, polybutylene succinate / carbonate, polybutylene succinate Nate / terephthalate, polybutylene adipate / terephthalate, polytetramethylenadipate / terephthalate, polybutylene succinate / adipate / terephthalate, etc. Polyethylene terephthalate is preferable.

  Further, if the intrinsic viscosity of the thermoplastic polyester resin is too low, drawdown is likely to occur at the time of forming the sheet, and if it is too high, the mechanical strength (particularly the elastic modulus) does not increase even when stretched. 0.0 is preferred.

  The thickness of the thermoplastic polyester resin sheet is not particularly limited, but if it is less than 0.1 mm, the sheet thickness after stretching becomes too thin, and the strength during handling may not be sufficiently large. Is preferably 0.1 to 5 mm, and more preferably 0.2 to 3 mm.

  The thermoplastic polyester resin sheet is in an amorphous state. The thermoplastic polyester resin sheet may be in an amorphous state, and the crystallinity thereof is not particularly limited, but the crystallinity measured by a differential scanning calorimeter is preferably less than 10%, more preferably. Is less than 5%.

  In the present invention, the amorphous thermoplastic polyester resin sheet is drawn and stretched. The method of drawing and stretching is not particularly limited, and may be drawn and drawn through a drawing die having a predetermined clearance, but drawing and drawing through a pair of rolls can freely control the thickness after drawing, and the drawing metal This is preferable because the specific part of the mold does not wear.

  The temperature of the thermoplastic polyester resin sheet during drawing and drawing is not particularly limited, but it is preferably preheated to a temperature near the glass transition temperature. If the preheating temperature is too low or too high, the resin sheet may not reach a predetermined temperature. Therefore, the glass transition temperature of the thermoplastic polyester resin −20 ° C. to the glass transition temperature of the thermoplastic polyester resin + 10 ° C. Is preferred.

  If the temperature at the time of drawing and drawing is low, the thermoplastic polyester resin sheet is too hard, and even if it is to be drawn, it may be cut first. The thermoplastic polyester resin sheet becomes soft when the temperature is high, and the thermoplastic polyester resin sheet is cut by the tension that pulls out the sheet. Therefore, the glass transition temperature of the thermoplastic polyester resin − 20 ° C to the glass transition temperature of the thermoplastic polyester resin + 20 ° C, preferably the glass transition temperature of the thermoplastic polyester resin to the glass transition temperature of the thermoplastic polyester resin + 10 ° C. is there.

  In addition, when the amorphous polyester resin sheet in an amorphous state is pulled out, the roll does not necessarily rotate. However, particularly when the thermoplastic polyester resin sheet is thick, heat accumulation of the roll due to shearing heat generation occurs. It is preferable to rotate the sheet in the drawing direction because the temperature of the resulting sheet is likely to increase.

  When the rotation speed of the roll is slow, the contact time between the roll and the thermoplastic polyester resin sheet becomes longer, frictional heat is generated, the roll temperature rises, and the effect of cooling the heated thermoplastic polyester resin is reduced. However, when the predetermined drawing and stretching temperature is exceeded and the rotational speed of the roll is increased, only the thermoplastic polyester resin on the surface of the thermoplastic polyester resin sheet flows and cannot be drawn and drawn uniformly. Further, the elastic modulus of the drawn and drawn thermoplastic polyester resin sheet is lowered. Therefore, the rotational speed of the roll is preferably substantially the same or lower than the feed speed when the thermoplastic polyester resin sheet is pulled out in the state where the roll is not rotating at the same drawing speed.

  Further, when the thickness of the thermoplastic polyester resin sheet is large (1.5 mm or more), heat generation due to shearing between the roll and the sheet becomes large, and therefore, the rotation speed of the roll is preferably 50 to 100% of the feed speed. . Moreover, when the thickness of a thermoplastic polyester-type resin sheet is thin, since the cooling effect by a roll is large, the rotational speed of a roll may be slow.

  The draw ratio of the above-described drawing stretching is not particularly limited, but if the stretching ratio is low, the tensile strength and the tensile elastic modulus tend to decrease, and if it is high, the sheet tends to break during stretching. Therefore, 2-9 times are preferable, More preferably, it is 2.5-7 times.

  In the present invention, the drawn and stretched thermoplastic polyester resin sheet is uniaxially stretched at a temperature higher than the drawing temperature to obtain a stretched thermoplastic polyester resin sheet. The polyester resin of the thermoplastic polyester resin sheet that has been drawn and stretched is highly oriented because molecular chains are highly oriented in a state in which isotropic crystallization and orientation due to heat, which is a hindrance to stretching, are suppressed. Although the elastic modulus is excellent, the degree of crystallinity is low, so that when heated, the orientation is easily relaxed and the elastic modulus is lowered. However, uniaxial stretching of the drawn and drawn thermoplastic polyester resin sheet at a temperature higher than the drawing temperature increases the crystallinity without relaxing the orientation, and the orientation is easily relaxed even when heated. A stretched thermoplastic polyester resin sheet having excellent heat resistance that is not obtained is obtained.

  As the uniaxial stretching method, a roll stretching method is preferably used. The roll stretching method is a method in which a stretched raw fabric is sandwiched between two pairs of rolls having different speeds, and the stretched raw fabric is pulled while being heated, and the molecular orientation can be strongly oriented only in a uniaxial direction.

  The temperature at the time of the uniaxial stretching may be higher than the temperature of the pair of rolls at the time of primary stretching, but if it is too high, the drawn and stretched thermoplastic polyester resin sheet tends to melt and be cut. Therefore, the temperature range from the rising temperature of the crystallization peak of the thermoplastic polyester resin to the rising temperature of the melting peak in the differential scanning calorimetry curve measured at a heating rate of 10 ° C./min is preferable. The rising temperature of the crystallization peak of polyethylene terephthalate is about 120 ° C., and the rising temperature of the melting peak is about 230 ° C. Accordingly, when the polyethylene terephthalate sheet is uniaxially stretched, it is preferably uniaxially stretched at about 120 ° C to about 230 ° C.

  The stretching ratio of the uniaxial stretching is not particularly limited, but if the stretching ratio is low, the tensile strength, the tensile elastic modulus, etc. tend to decrease, and if it is high, the sheet tends to break during stretching. Therefore, 1.05 to 3 times is preferable, and 1.1 to 2 times is more preferable. The total draw ratio, which is the product of drawing and uniaxial drawing, is preferably 2.5 to 10 times, more preferably 3 to 8 times for the same reason.

  The uniaxially stretched stretched thermoplastic polyester resin sheet is preferably heat-set at a temperature higher than the uniaxial stretch temperature in order to further improve the heat resistance.

  When the heat setting temperature is lower than the rising temperature of the crystallization peak of the thermoplastic polyester resin in the differential scanning calorimetry curve measured at a heating rate of 10 ° C./min, the crystallization of the thermoplastic polyester resin does not proceed, so the heat resistance However, when the temperature is higher than the rise temperature of the melting peak, the thermoplastic polyester-based resin dissolves and the stretching (orientation) disappears, the tensile elastic modulus, the tensile strength, etc. are lowered, and when the uniaxial stretching temperature is 30 ° C. or higher, Since the orientation of crystals crystallized at the uniaxial stretching temperature is relaxed, the rising temperature of the crystallization peak of the thermoplastic polyester resin in the differential scanning calorimetry curve measured at a heating rate of 10 ° C./min to the rising temperature of the melting peak And the temperature which is not 30 degreeC or more higher than a uniaxial stretching temperature is preferable.

  In addition, when heat-fixed, if the stretched thermoplastic polyester resin sheet is under load, it is stretched and shrinks in a free state, so the length of the stretched thermoplastic polyester resin sheet in the stretching direction changes substantially. It is preferable to carry out in such a state that it does not occur, and it is preferable that no pressure is applied to the stretched thermoplastic polyester resin sheet.

  That is, the length of the stretched thermoplastic polyester resin sheet that has been heat-set is 0.95 to 1.1 of the length of the stretched thermoplastic polyester resin sheet before heat setting, and is a lower ratio than the uniaxial stretch ratio. It is preferable to heat-fix like this. Therefore, when the stretched thermoplastic polyester resin sheet is heat-set continuously while moving in the heating chamber with a roll such as a pinch roll, the feed rate ratio of the stretched thermoplastic polyester resin sheet on the inlet side and the outlet side is set to 0. It is preferable to heat-set by setting it to a magnification lower than the uniaxial stretching magnification at .95 to 1.1.

  The heating method at the time of heat setting is not particularly limited, and examples thereof include a method of heating with hot air or a heater. The time for heat setting is not particularly limited, but is generally 10 seconds to 10 minutes, although it varies depending on the thickness of the stretched thermoplastic polyester resin sheet and the heat setting temperature.

  Furthermore, the range of the rising temperature of the crystallization peak of the thermoplastic polyester resin in the differential scanning calorimetry curve of the heat-set stretched thermoplastic polyester resin sheet measured at a glass transition temperature to a heating rate of 10 ° C./min. Thus, it is preferable to anneal in a state where substantially no tension is applied. By annealing, the stretched thermoplastic polyester resin sheet has good mechanical properties such as elastic modulus, and even when heated to a temperature above the glass transition temperature, the mechanical properties such as elastic modulus do not decrease. In addition, the shrinkage rate can be kept low.

  In addition, since the stretched thermoplastic polyester resin sheet is stretched when a large tension is applied thereto, it is preferable to anneal the stretched thermoplastic polyester resin sheet in a state where no tension is applied to the stretched thermoplastic polyester resin sheet. That is, it is preferable to anneal so that the length of the annealed stretched thermoplastic polyester resin sheet is 1.0 or less of the length of the stretched thermoplastic polyester resin sheet before annealing.

  Therefore, when the stretched thermoplastic polyester resin sheet is continuously annealed while being moved in a heating chamber by a roll such as a pinch roll, the feed rate ratio of the stretched thermoplastic polyester resin sheet on the inlet side and the outlet side is set to 1. It is preferable that annealing is performed with setting to be 0 or less. Further, when annealing the short sheet, it is preferable to open both ends so that no load is applied. The heating method at the time of annealing is not particularly limited, and examples thereof include a method of heating with hot air or a heater.

  The time for annealing is not particularly limited and varies depending on the thickness of the stretched thermoplastic polyester resin sheet and the annealing temperature, but is generally preferably 10 seconds or longer, more preferably 30 seconds to 60 minutes, and further preferably 1 to 20 Minutes.

When the stretched thermoplastic polyester resin sheet has a large linear expansion coefficient, it expands and contracts greatly due to a temperature difference. Therefore, a smaller one is preferable, and a negative one is particularly preferable. Therefore, it is preferably −1.5 × 10 ⁻⁵ or more and less than 0. Moreover, when the tensile elastic modulus of the thermoplastic polyester resin sheet is less than 7 GPa, the linear expansion coefficient of the laminated molded body in which the thermoplastic resin layers are laminated on both sides of the stretched thermoplastic polyester resin sheet is increased, and when it exceeds 15 GPa. Since the impact resistance of the laminated molded body is lowered, the tensile elastic modulus of the stretched thermoplastic polyester resin sheet is preferably 7 to 15 GPa.

  In the blind slat of the present invention, a thermoplastic resin layer is laminated on both surfaces of the stretched thermoplastic polyester resin sheet. The thermoplastic resin is laminated on both sides of the stretched thermoplastic polyester resin sheet to protect the stretched thermoplastic polyester resin sheet from cracking and cracking along the stretch direction due to impact, and the polyester resin It is intended to prevent the durability from lowering due to hydrolysis or deterioration when exposed to sunlight.

  When the thermoplastic resin is melted and laminated on both sides of the stretched thermoplastic polyester resin sheet, if the melting point of the thermoplastic resin is higher than the melting point of the thermoplastic polyester resin, the crystals of the stretched thermoplastic polyester resin sheet relax. Since the coefficient of linear expansion is high, the thermoplastic resin is preferably a resin having a lower melting point than the thermoplastic polyester resin.

  Examples of the thermoplastic resin include vinyl chloride resin, chlorinated vinyl chloride resin, chlorinated polyethylene resin, ABS resin, AES resin, styrene resin, AS resin, methyl methacrylate resin, ethylene resin, and polypropylene resin. Vinyl chloride resin is preferred. Moreover, paints such as fluorine paint, acrylic silicon paint, and urethane paint may be used.

  In order to improve the high weather resistance of the thermoplastic resin layer exposed to direct sunlight, an ultraviolet absorber, light stabilizer, antioxidant, heat stabilizer, heat improver, inorganic filler, etc. may be added. Further, an impact modifier may be added to improve the impact resistance.

  Examples of the ultraviolet absorber include salicylic acid ester series, benzophenone series, benzotriazole series, and cyanoacrylate series. Examples of the light stabilizer include bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate and decanedioic acid (2,2,6,6-tetramethyl-1 (octyloxy) -4. Hindered amine light stabilizers such as a reaction product of -piperidinyl) ester, 1,1-dimethylethyl hydroperoxide and octane.

  Examples of the antioxidant include pentaerythritol tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], octadecyl-3- (3,5-di-tert-butyl-4). -Hydroxyphenyl) propionate, phenolic antioxidants such as ethylenebis (oxyethylene) bis [3- (5-tert-butyl-4-hydroxy-m-tolyl) propionate], sulfur antioxidants, phosphites An antioxidant etc. are mentioned.

  Examples of the heat stabilizer include lead-based stabilizers such as lead stearate, dibasic lead phosphite, and tribasic lead sulfate, calcium-zinc stabilizers, barium-zinc stabilizers, and barium-cadmium. Inorganic heat stabilizers such as system stabilizers, dibutyltin mercapto, dioctyltin mercapto, dimethyltin mercapto, dibutyltin malate, dioctyltin malate, dibutyltin malate polymer, dioctyltin malate polymer, dibutyltin laurate, dioctyltin laurate And tin-based heat stabilizers such as dialkyltin bis (mercapto fatty acid ester) and dialkyltin sulfide. Examples of the heat resistance improver include α-methylstyrene and N-phenylmaleimide.

  Examples of the inorganic filler include calcium carbonate, magnesium carbonate, aluminum oxide, magnesium oxide, titanium oxide, magnesium hydroxide, talc, mica, clay, fly ash, wollastonite and the like. Examples of the impact modifier include methyl methacrylate-butadiene-styrene copolymer (MBS resin), chlorinated polyethylene, acrylic rubber, and the like.

  Further, a thermoplastic resin layer is laminated on both sides of the stretched thermoplastic polyester resin sheet, and further, the ultraviolet absorber, light stabilizer, antioxidant, thermal stabilizer, heat resistance improver, A highly weather resistant thermoplastic resin layer to which an inorganic filler or the like is added may be laminated.

The thickness of the thermoplastic resin layer is not particularly limited, and may be appropriately determined depending on the application. However, if the thickness is too thin, the protective effect is reduced, and if the thickness is increased, the thickness becomes heavy and the stretched thermoplastic polyester resin sheet is low. Since the effect of the expansion coefficient is reduced, 0.1 to 3 mm is preferable.
Moreover, when laminating | stacking the said thermoplastic resin layer and a highly weather-resistant thermoplastic resin layer, the total thickness of the both layers has preferable 0.1-3 mm.

  The method for laminating the thermoplastic resin layers on both sides of the stretched thermoplastic polyester resin sheet is not particularly limited, and any conventionally known laminating method may be employed. For example, (1) stretched thermoplastic polyester resin sheet (2) A method in which a thermoplastic resin sheet is laminated on both sides of a stretched thermoplastic polyester resin sheet by hot pressing, and (3) a stretched thermoplastic polyester. The thermoplastic resin sheet is bonded to both sides of the thermoplastic resin sheet with a hot melt type adhesive such as polyester or polyolefin having a melting point lower than that of the thermoplastic polyester resin constituting the stretched thermoplastic polyester resin sheet. Lamination method, (4) Reactive adhesive, epoxy contact on both sides of stretched thermoplastic polyester resin sheet Adhesives, urethane adhesives, polyester-based adhesives, a method to laminate by bonding a thermoplastic resin sheet or the like with an adhesive or the like rubber adhesive.

  In order to increase the adhesive strength in the above method, (a) the surface of the stretched thermoplastic polyester resin sheet is scraped to form irregularities on the surface, and the thermoplastic resin is extrusion-coated, or the thermoplastic resin sheet is pressed, A method of laminating by the anchor effect, (b) forming a large number of through holes in the stretched thermoplastic polyester resin sheet and extrusion-coating the thermoplastic resin or pressing the thermoplastic resin sheet, and the thermoplastic resin on both sides through the through holes A method of fusing and laminating sheets, and (c) a thermoplastic resin constituting a thermoplastic resin layer and a melting point of the thermoplastic polyester resin constituting the stretched thermoplastic polyester resin sheet on the stretched thermoplastic polyester resin sheet Laminate adhesive layers made of hot melt adhesives such as polyester and polyolefin having a melting point lower than the melting point of After that, a thermoplastic resin is melt-extruded on the adhesive layer, or a thermoplastic resin sheet is pressed and heated to be fused. (D) A polyester, polyolefin, or the like is bonded to a stretched thermoplastic polyester resin sheet. (E) A stretched thermoplastic polyester resin sheet is formed between the stretched thermoplastic polyester resin sheet and the thermoplastic resin layer. After laminating a polyester-type, polyolefin-type or other sheet-like hot melt adhesive having a melting point lower than the melting point of the thermoplastic polyester resin and the melting point of the thermoplastic resin constituting the thermoplastic resin layer, the hot A method such as a method of heating and fusing the melt-type adhesive may be employed.

  Further, a woven fabric and / or a nonwoven fabric may be laminated between the stretched thermoplastic polyester resin sheet and the thermoplastic resin layer. When the woven fabric and / or the nonwoven fabric are laminated, the adhesion between the stretched thermoplastic polyester resin sheet and the thermoplastic resin layer is improved, and the tensile strength, impact resistance, and the like of the obtained blind slat are improved.

The woven fabric and / or nonwoven fabric is not particularly limited, and any conventionally known woven fabric and nonwoven fabric can be used. For example, natural fibers such as cotton and suf, polyethylene fibers, polypropylene fibers, polyester fibers, nylon Examples thereof include woven fabrics and non-woven fabrics composed of fibers, synthetic fibers such as vinylon fibers and acrylic fibers, and fibers such as inorganic fibers such as glass fibers and carbon fibers. The basis weight, thickness, etc. of the woven fabric and the nonwoven fabric are not particularly limited. Generally, the basis weight is preferably 10 to 500 g / m ² and the thickness is preferably 0.03 to 4 mm.

  As a method of laminating the stretched thermoplastic polyester resin sheet and the woven fabric and / or the nonwoven fabric and the woven fabric and / or the nonwoven fabric and the thermoplastic resin layer, any conventionally known method may be adopted. Since the stretching of the thermoplastic polyester resin sheet is relaxed, hot melt adhesives and reactions such as polyesters and polyolefins having a melting point lower than the melting point of the thermoplastic polyester resin constituting the stretched thermoplastic polyester resin sheet The adhesive is preferably bonded with one or two or more adhesives selected from the group consisting of adhesives, epoxy adhesives, urethane adhesives, polyester adhesives, and rubber adhesives.

  In addition, stretched thermoplastic polyester resin sheet and woven and / or non-woven fabric and woven and / or non-woven fabric and thermoplastic resin layer are laminated more easily and firmly bonded to improve impact resistance. A woven fabric and / or a nonwoven fabric impregnated with a hot-melt adhesive having a melting point of the polyester resin and a melting point lower than that of the thermoplastic resin constituting the thermoplastic resin layer, a stretched thermoplastic polyester resin sheet and a thermoplastic resin The layers may be laminated and bonded.

  In addition, the stretched thermoplastic polyester resin sheet and the woven and / or non-woven fabric and the woven and / or non-woven fabric and the thermoplastic resin layer are laminated more easily and strongly bonded to improve impact resistance. Stretch woven and / or non-woven fabric impregnated with one or more adhesives selected from the group consisting of adhesives, epoxy adhesives, urethane adhesives, polyester adhesives and rubber adhesives You may laminate | stack and adhere | attach between a thermoplastic polyester-type resin sheet and a thermoplastic resin layer.

  The blind slats can be formed into a predetermined shape by a forming method such as profile molding or bending, and a blind slat having a predetermined shape is obtained. In order to improve the weather resistance and design of the blind slats, a different resin layer may be laminated on the surface of the thermoplastic resin layer, or a paint may be applied.

  The blind slat according to claim 3, wherein the thermoplastic polyester resin sheet in an amorphous state is a temperature between the glass transition temperature of the thermoplastic polyester resin of -20 ° C and the glass transition temperature of the thermoplastic polyester resin of + 20 ° C. A thermoplastic resin layer is laminated on both sides of a laminated sheet in which two or more stretched thermoplastic polyester resin sheets obtained by uniaxial stretching at a temperature higher than the drawing temperature are drawn after It is characterized by.

  The blind slat is different from the stretched thermoplastic polyester resin sheet in claim 1 only in that a laminated sheet in which two or more stretched thermoplastic polyester resin sheets are laminated is used. Two or more stretched thermoplastic polyester resin sheets may be laminated, but four or more are preferably laminated in order to improve mechanical strength.

  The stretched thermoplastic polyester resin sheets may be laminated so that the stretching directions are substantially the same direction, or may be laminated differently. When the stretched thermoplastic polyester resin sheet is apt to break, it is preferably laminated with four or more sheets so that the stretching direction is different, more preferably 5 to 100 sheets, and still more preferably 6 to 50 sheets.

  When the layers are laminated so that the stretching directions are different, the stretching directions of the adjacent stretched thermoplastic polyester resin sheets are preferably different. However, if the angle difference is small, the reinforcing effect is small, so that the difference is 30 to 90 degrees. Preferably, it is 45 to 90 degrees. Moreover, in order to improve mechanical strength, it is preferable that the extending | stretching direction of the laminated extending | stretching thermoplastic polyester-type resin sheet is arrange | positioned with sufficient balance in all the directions. For example, when laminating five stretched thermoplastic polyester resin sheets, if the stretching direction of the first stretched thermoplastic polyester resin sheet is 0 degree, stretching of the second to fifth stretched thermoplastic polyester resin sheets is performed. When laminating seven stretched thermoplastic polyester resin sheets whose directions are +45 degrees, +90 degrees, -45 degrees, and 0 degrees, when the stretching direction of the first stretched thermoplastic polyester resin sheet is 0 degrees, Examples of the lamination method include setting the stretching direction of the second to seventh stretched thermoplastic polyester resin sheets to +45 degrees, −60 degrees, +90 degrees, −45 degrees, +60 degrees, and 0 degrees.

  The layered method of the stretched thermoplastic polyester resin sheet may be any conventionally known method. However, the stretch of the stretched thermoplastic polyester resin sheet is relaxed when heat-sealed. It is preferable to bond with a hot melt type adhesive such as polyester or polyolefin having a melting point lower than that of the thermoplastic polyester resin constituting the resin sheet.

  The method of adhering with the hot melt adhesive is not particularly limited. For example, at least one of the methods in which the molten hot melt adhesive is applied to at least one stretched thermoplastic polyester resin sheet and the two are laminated and fused at the same time. A molten hot-melt adhesive is applied to the stretched thermoplastic polyester resin sheet and cooled to form a hot-melt adhesive layer and then laminated, or a sheet between two or more stretched thermoplastic polyester-based resin sheets And a method of heating a laminated body obtained by laminating a hot-melt adhesive in the form of a melt to melt and melt the hot-melt adhesive.

  A thermoplastic polyester resin having a melting point lower than the melting point of the thermoplastic polyester resin constituting the stretched thermoplastic polyester resin sheet as the hot melt adhesive because it is a fusion of the stretched thermoplastic polyester resin sheets. A woven fabric and / or a non-woven fabric is preferably used. When fused with a woven fabric and / or a nonwoven fabric made of thermoplastic polyester resin, the adhesive strength is high, and the tensile strength, impact resistance and the like are improved.

  As the fibers constituting the thermoplastic polyester resin woven fabric and / or nonwoven fabric, the above-mentioned thermoplastic polyester resin fibers and the above-mentioned thermoplastic polyester resins and natural fibers such as cotton and suf, polyethylene fibers, Examples thereof include synthetic fibers such as polypropylene fibers, polyester fibers, polyimide fibers, polyvinyl alcohol fibers, and acrylic fibers, and mixed fibers with fibers such as glass fibers, carbon fibers, metal fibers, and ceramic fibers.

  As the nonwoven fabric, any conventionally known nonwoven fabric can be used. For example, dry-type nonwoven fabric such as range bond nonwoven fabric, thermal bond nonwoven fabric, needle punch nonwoven fabric, spunlace nonwoven fabric, airlaid nonwoven fabric, spunbond nonwoven fabric, and melt blown nonwoven fabric. Examples include a directly-spun type nonwoven fabric, a wet nonwoven fabric, and the like. Needle punch nonwoven fabrics and spunlace nonwoven fabrics that are rich in bulk properties, flexibility, and the like and are difficult to delaminate are preferable.

  The needle punched nonwoven fabric is a nonwoven fabric in which a needle (needle) that moves up and down at high speed is repeatedly pierced on a web formed by arranging short fibers randomly, and the fibers are entangled by protrusions called barbs carved in the needle. The spunlace nonwoven fabric is a three-dimensional fiber that uses a high-pressure pump to eject a 30-500 bar high-pressure water stream from the nozzle onto the web, and the high-pressure water stream punches the web and repels the punched high-pressure water stream. It is a nonwoven fabric intertwined.

The basis weight, thickness, etc. of the thermoplastic polyester resin woven fabric and nonwoven fabric are not particularly limited, but generally the basis weight is preferably 10 to 500 g / m ² and the thickness is 0.03 to 4 mm. preferable.

  In addition, in order to more easily laminate stretched thermoplastic polyester resin sheets and fuse them firmly to improve impact resistance, the melting point is lower than the melting point of the thermoplastic polyester resin constituting the stretched thermoplastic polyester resin sheet. A method of laminating and fusing a woven fabric and / or a nonwoven fabric impregnated with a polyester-based, polyolefin-based or other hot-melt type adhesive between stretched thermoplastic polyester-based resin sheets is also preferable.

  The woven fabric and / or nonwoven fabric is not particularly limited, and any conventionally known woven fabric and nonwoven fabric can be used. For example, natural fibers such as cotton and suf, polyethylene fibers, polypropylene fibers, polyester fibers, polyimides Examples thereof include woven fabrics and non-woven fabrics composed of fibers such as fibers, polyvinyl alcohol fibers, acrylic fibers and other synthetic fibers, glass fibers, carbon fibers, metal fibers, ceramic fibers, and other inorganic fibers.

  As the nonwoven fabric, any conventionally known nonwoven fabric can be used. For example, dry-type nonwoven fabric such as range bond nonwoven fabric, thermal bond nonwoven fabric, needle punch nonwoven fabric, spunlace nonwoven fabric, airlaid nonwoven fabric, spunbond nonwoven fabric, and melt blown nonwoven fabric. Examples include a directly-spun type nonwoven fabric, a wet nonwoven fabric, and the like. Needle punch nonwoven fabrics and spunlace nonwoven fabrics that are rich in bulk properties, flexibility, and the like and are difficult to delaminate are preferable.

The basis weight and thickness of the woven fabric and the nonwoven fabric are not particularly limited, but generally the basis weight is preferably 10 to 500 g / m ² and the thickness is preferably 0.03 to 4 mm.

  In the method of melting and fusing the hot melt adhesive, it is preferable to melt and fuse the hot melt adhesive with an ultrasonic welder. As a method of fusing with an ultrasonic welder, any conventionally known method may be employed. For example, the stretched thermoplastic polyester resin sheet, hot melt adhesive, woven fabric and / or nonwoven fabric, thermoplastic resin layer For example, a method of passing a laminated body such as between a horn and a knurl that are vibrated at a frequency of 15 to 40 kHz.

  FIG. 1 is an explanatory view showing an example of a method of fusing two stretched thermoplastic polyester resin sheets with an ultrasonic welder with a thermoplastic polyester resin woven fabric that is a hot melt adhesive. In the figure, reference numerals 1 and 1 denote stretched thermoplastic polyester resin sheets, and a thermoplastic polyester resin woven fabric hot melt adhesive sheet 2 is laminated between the stretched thermoplastic polyester resin sheets 1 and 1 and laminated. A sheet 10 is formed.

  The laminated molded body 10 is transported while being pressed by the horn 3 and the knurl 4 and is vibrated at a frequency of 15 to 40 kHz from the horn 3, thereby instantly causing frictional heat from ultrasonic vibration transmitted from the horn 3. The thermoplastic polyester resin woven fabric 2 is heated and melted and fused. At this time, in order to fuse more efficiently, it is preferable that the gap between the horn 3 and the knurl 4 is set smaller than the thickness of the laminated sheet 10 and the laminated sheet 10 is fused while being pressed by the horn 3 and the knurl 4.

  In order to pressurize, it is preferable to connect an air cylinder, a hydraulic cylinder, etc. to the horn 3 and press the horn 3 against the knurl 4 through the laminated molded body 10. In addition, since the protrusions are formed on the surface of the knurl 4, fusion can be performed more efficiently. By changing the arrangement and shape of the protrusions, the arrangement of the fusion parts and the pattern of the shape can be changed. can do.

  2-6 is explanatory drawing which shows the example of the arrangement | sequence pattern of a fusion | fusion part. In the figure, 10 is a laminated sheet fused by an ultrasonic welder, A is the stretching direction of the stretched thermoplastic polyester resin sheet 1, and 5 is a fusion site. Further, when fusing with an ultrasonic welder, tension is applied to the laminated sheet 10 (stretched thermoplastic polyester resin sheet 1) in order to prevent the orientation state of the stretched thermoplastic polyester resin sheet 1 from being relaxed. Is preferably loaded.

  As a method of laminating different stretched thermoplastic polyester resin sheets, a woven fabric and / or a non-woven fabric having a melting point higher than that of the thermoplastic polyester resin is laminated between two or more stretched thermoplastic polyester resin sheets. The stretched thermoplastic polyester resin sheet is softened and melted and pressed to cause the woven fabric and / or the nonwoven fabric to bite into the stretched thermoplastic polyester resin sheet and be fused. Any conventionally known method may be adopted as a method for softening and melting the stretched thermoplastic polyester resin sheet, but it is preferably heated by an ultrasonic welder. Examples of the woven fabric and / or nonwoven fabric include the woven fabric and / or nonwoven fabric described above, and the woven fabric and / or nonwoven fabric having a melting point higher than the melting point of the thermoplastic polyester resin constituting the thermoplastic polyester resin sheet. can give.

  Further, as a method of laminating different stretched thermoplastic polyester resin sheets, one kind selected from the group consisting of reactive adhesives, epoxy adhesives, urethane adhesives, polyester adhesives, and rubber adhesives Or the method of adhering with 2 or more types of adhesives is mention | raise | lifted.

  Alternatively, the woven fabric and / or the nonwoven fabric impregnated with the adhesive may be laminated between stretched thermoplastic polyester resin sheets and bonded by the adhesive. When a woven fabric and / or a nonwoven fabric impregnated with an adhesive is laminated and bonded, the adhesion of the stretched thermoplastic polyester resin sheet is improved, and the resulting laminate has tensile strength, impact resistance, etc. improves.

  As the nonwoven fabric, any conventionally known nonwoven fabric can be used. For example, dry-type nonwoven fabric such as range bond nonwoven fabric, thermal bond nonwoven fabric, needle punch nonwoven fabric, spunlace nonwoven fabric, airlaid nonwoven fabric, spunbond nonwoven fabric, and melt blown nonwoven fabric. Examples include a directly-spun type nonwoven fabric, a wet nonwoven fabric, and the like. Needle punch nonwoven fabrics and spunlace nonwoven fabrics that are rich in bulk properties, flexibility, and the like and are difficult to delaminate are preferable.

  The structure of the blind slat of the present invention is as described above, is lightweight, has excellent mechanical strength, impact resistance, weather resistance, and the like, and can be used safely without causing radio interference. In particular, the blind slat according to claim 4 has a higher mechanical strength, and the blind slat using a laminated sheet in which stretched thermoplastic polyester resin sheets are laminated in different stretching directions as a core material is more mechanical. Excellent mechanical strength.

Next, although an example of the present invention is given and explained in detail, the present invention is not limited to the following example.
(Example 1)
A polyethylene terephthalate sheet having a thickness of 1 mm (manufactured by Teijin Chemicals Ltd., trade name “A-PET sheet FR”: limiting viscosity 0.7, crystallinity 4%) is supplied to a stretching apparatus (manufactured by Kyowa Engineering Co., Ltd.) at 75 ° C. After preheating to 70 ° C., a pair of rolls heated to 70 ° C. (roll interval 0.2 mm) is pulled out at a rate of 2 m / min, and the surface temperature of the polyethylene terephthalate sheet is heated to 180 ° C. in a hot air heating tank, The roll was stretched at an outlet speed of 2.5 m / min to obtain a stretched polyethylene terephthalate sheet having a stretch ratio of about 5 times. The polyethylene terephthalate sheet has a glass transition temperature of 72 ° C., a rising temperature of the crystallization peak in the differential scanning calorimetry measured at a heating rate of 1 ° C./min is about 118 ° C., and a rising temperature of the melting peak is about It was 230 ° C.

  One side of the obtained stretched polyethylene terephthalate sheet was melt extrusion coated with a polyester hot melt adhesive (trade name “Byron GM-920”, melting point 107 ° C., manufactured by Toyobo Co., Ltd.) at a thickness of 0.03 mm. An adhesive laminated stretched polyethylene terephthalate sheet was obtained.

  When the obtained adhesive-laminated stretched polyethylene terephthalate sheet and 4 stretched polyethylene terephthalate sheet on which no adhesive is laminated have the stretching direction of the top sheet as 0 degree, the stretching direction is +45 in order from the top. The stretching direction was adjusted so that the angle was + 90 °, −45 °, and 0 °, and the laminate was laminated so that the adhesive layer was interposed between the sheets, and adhered by an ultrasonic welder to obtain a laminated sheet. The fusion pattern is as shown in FIG. 2, the size of the fusion part is about 1.5 mm in length along the drawing direction, the width is about 0.5 mm, and the distance between the fusion parts is about 1 in the drawing direction. 0.5 mm and a width of about 1.5 mm.

  The blind slats of the present invention in which vinyl chloride resin (product number “TS1000R” manufactured by Tokuyama Sekisui Co., Ltd.) is extrusion coated at 200 ° C. on both sides of the obtained laminated sheet, and vinyl chloride resin is laminated on both sides of the laminated sheet. Got.

When the linear expansion coefficient of the obtained blind slat was measured according to JIS K 7197, it was 1.4 × 10 ⁻⁵ (1 / ° C.). The tensile modulus measured in accordance with JIS K 7113 is 5.1 GPa, and a falling ball impact test (the laminated molded body is cut to a length of 4 m, cured for 1 hour in a freezing chamber at 0 ° C., then opened) It was installed so that the part was on the lower side, a 1 kg insulator weight was dropped from a height of 1.3 m, and the presence or absence of cracks was observed.) When cracking was performed, no cracks could be observed. Further, the blind slat was cut to a length of 1800 mm and a width of 50 mm, both ends thereof were placed on a support member, and a durability test was conducted at 70 ° C. for 100 days. However, no deflection occurred.

It is explanatory drawing which shows an example of the method of making two extending | stretching thermoplastic polyester-type resin sheets by an ultrasonic welder with a hot-melt-type adhesive agent. It is explanatory drawing which shows an example of the arrangement pattern of the fusion | melting site | part of a lamination sheet. It is explanatory drawing which shows the example from which the arrangement | sequence pattern of the fusion | fusion part of a lamination sheet differs. It is explanatory drawing which shows the example from which the arrangement | sequence pattern of the fusion | fusion part of a lamination sheet differs. It is explanatory drawing which shows the example from which the arrangement | sequence pattern of the fusion | fusion part of a lamination sheet differs. It is explanatory drawing which shows the example from which the arrangement | sequence pattern of the fusion | fusion part of a lamination sheet differs.

Explanation of symbols

1 stretched thermoplastic polyester resin sheet 2 hot melt adhesive sheet 3 horn 4 knurl 5 fused part 10 laminate 11 laminate sheet

Claims (9)

  After drawing and stretching the amorphous polyester resin sheet in an amorphous state at a glass transition temperature of the thermoplastic polyester resin of −20 ° C. to a glass transition temperature of the thermoplastic polyester resin of + 20 ° C., from the drawing temperature A blind slat characterized in that a thermoplastic resin layer is laminated on both sides of a stretched thermoplastic polyester resin sheet obtained by uniaxial stretching at a high temperature.   The blind slat according to claim 1, wherein the stretched thermoplastic polyester resin sheet and the thermoplastic resin layer are bonded with a hot-melt adhesive having a melting point lower than that of the thermoplastic polyester resin.   After drawing and stretching the amorphous polyester resin sheet in an amorphous state at a glass transition temperature of the thermoplastic polyester resin of −20 ° C. to a glass transition temperature of the thermoplastic polyester resin of + 20 ° C., from the drawing temperature A blind slat characterized in that a thermoplastic resin layer is laminated on both surfaces of a laminated sheet obtained by laminating two or more stretched thermoplastic polyester resin sheets obtained by uniaxial stretching at a high temperature.   The blind slat according to claim 3, wherein the number of laminated thermoplastic polyester resin sheets is 4 or more.   The blind slat according to claim 3 or 4, wherein the stretched thermoplastic polyester resin sheet is laminated so that the stretching direction is substantially the same direction.   The blind slat according to claim 3 or 4, wherein the adjacent stretched thermoplastic polyester resin sheets are laminated so that stretching directions thereof are different.   The blind slat according to claim 6, wherein the adjacent stretched thermoplastic polyester resin sheets have different stretching directions in an angle of 45 to 90 degrees.   The laminated sheet and the thermoplastic resin layer are bonded with a hot-melt adhesive having a melting point lower than the melting point of the thermoplastic polyester resin, for blinds according to any one of claims 3 to 7, Slat.   The blind slat according to any one of claims 1 to 8, wherein the thermoplastic resin is a vinyl chloride resin.

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