JP4832942B2 - Method for producing odd-shaped long molded body - Google Patents

Description

  The present invention relates to a method for producing an irregular long molded body, and more particularly to a method for producing an irregular long molded body of a stretched thermoplastic polyester resin sheet that can be suitably used as a rain gutter.

  Vinyl chloride resins are widely used as materials for building members because they are excellent in water resistance, flame retardancy, mechanical properties, and the like, and are relatively inexpensive. For example, rain gutters are generally formed by extrusion of a hard vinyl chloride resin.

However, the linear expansion coefficient of hard vinyl chloride resin molding is as large as 7.0 × 10 ^-5 (1 / ° C), so when installing a hard vinyl chloride resin gutter, Although it was necessary to connect with an absorbable joint or to make the end free, when the entire length of the rain gutter to be constructed becomes longer, there are disadvantages that the number of joints and outlets increases and the appearance is poor. It was.

For this reason, various studies have been made on rain gutters having a low linear expansion coefficient. For example, it consists of a vinyl chloride resin composition in which 20 to 35 parts by weight of mica, 20 to 40 parts by weight of calcium carbonate, and 5 to 15 parts by weight of processing aids are added to 100 parts by weight of vinyl chloride resin. A vinyl chloride resin rain gutter (see, for example, Patent Document 1) is proposed.
Japanese Patent No. 2905260

  The above gutters are made of vinyl chloride resin with mica and calcium carbonate added to lower the linear expansion coefficient of gutters, but are mainly made of vinyl chloride resin, and the amount of mica and calcium carbonate added is low. If the amount is small, the linear expansion coefficient is still high, and if the amount added is large, the impact resistance and durability of the rain gutter are lowered.

In addition, rain gutters impregnated with glass fiber as a reinforcing material or laminated with metal thin plates have been proposed. For example, a composite sheet composed of a thermoplastic resin and reinforcing fibers is shaped to the required cross-sectional shape, and the thermoplastic resin is extrusion-coated on the surface, and the composite sheet is reinforced at least on the shaped part. A composite molded product characterized in that short fibers are randomly oriented (see, for example, Patent Document 2), a metal thin plate as a core material, and a synthetic resin is coated on both surfaces of the core material to form a sheet material, In the rain gutter formed by pressing the bending jig distal end against the sheet material to be bent into a substantially U-shaped cross section, the bending jig distal end is located at the bending position of the synthetic resin on the inner surface side. A rain gutter (see, for example, Patent Document 3) characterized by providing a groove to be guided has been proposed.
Japanese Patent Laid-Open No. 11-19998 Japanese Patent Laid-Open No. 9-297883

  However, the former gutter consists of a thermoplastic resin and reinforcing fibers. A composite sheet in which short fibers are randomly oriented must be created and shaped into the required cross-sectional shape, and then the thermoplastic resin must be extrusion coated on the surface. It is difficult to manufacture, and there is a problem in disposal.

  The latter rain gutter is laminated with a thin metal plate as a core material, so that it is heavy and difficult to cut, and the metal thin plate is exposed at the end of the gutter, and rust is generated over time. In addition, there is a drawback that durability is lowered by corrosion.

Further, as a rain gutter having a low linear expansion coefficient without using a core material or glass fiber made of a thin metal plate, for example, an average linear expansion coefficient of 20 to 80 ° C. is 5 × 10 ⁻⁵ (1 / ° C.) or less. The low molecular weight compound that dissolves the polyolefin was adhered to the surface of the stretched polyolefin material, and then the polyolefin stretched material was adhered by pressing and heating, and the average linear expansion coefficient at 20 to 80 ° C. was 5 × 10 ⁻⁵ ( 1 / ° C) or less polyolefin molded body (see, for example, Patent Document 4), after extruding a thermoplastic resin, the extruded material is further stretched and stretched to orient the molecules in one direction. A synthetic resin rain gutter characterized in that the linear expansion coefficient of the thermoplastic synthetic resin is 6 × 10 ⁻⁵ / ° C. or less and the thickness is greater than 0.5 mm has been proposed (for example, see Patent Document 5). Yes.
JP-A-10-291250 Japanese Patent Laid-Open No. 2002-285685

  However, the former rain gutter is a sheet obtained by highly stretching a polyolefin stretched material 20 to 40 times, and has a disadvantage that it is easily broken along the stretch direction and has poor impact resistance. When trying to laminate with vinyl resin, AES resin or the like, polyolefin has a lower melting point than these resins, so that the stretched state of the polyolefin collapses and the linear expansion coefficient becomes high. Further, since the latter rain gutter is simply a stretched gutter that has been stretched, it has the disadvantage of being easily broken along the stretch direction and having poor impact resistance.

In view of the above-mentioned drawbacks, the object of the present invention is to allow a long thermoplastic polyester resin sheet that is uniaxially stretched in the length direction to be shaped without cracking and shrinking along the stretch direction. An object of the present invention is to provide a method for producing an irregular long molded article.

  Also, the different purpose is a method for producing an atypical long molded body having a small linear expansion coefficient, light weight, excellent impact resistance, durability, workability, etc., and particularly suitable for exterior building materials such as rain gutters. An object of the present invention is to provide a method for producing a deformable long molded body.

According to the method for producing an atypical long molded article of the present invention, an amorphous thermoplastic polyester resin sheet is drawn and stretched at a glass transition temperature ± 20 ° C. of the thermoplastic polyester resin, and then drawn from the drawing temperature. Only a position where a long thermoplastic polyester resin sheet uniaxially stretched in the length direction is uniaxially stretched at a high temperature with a total stretch ratio of 3 to 8 times is deformably heated to form a slit having a predetermined shape. Is a method for producing an odd-shaped long molded body that passes a slit of a plurality of plates formed to shape a long thermoplastic polyester resin sheet, and the slit shape of the plate goes from upstream to downstream The cross-sectional shape of the irregular long shaped product is gradually increased from the planar shape.

  When the stretched thermoplastic polyester resin sheet has a tensile modulus of less than 7 GPa, the linear expansion coefficient increases, and when it exceeds 15 GPa, the impact resistance decreases. Therefore, the stretched thermoplastic polyester resin sheet has a tensile modulus of 7 to 7 15 GPa is preferred.

The long thermoplastic polyester resin sheet is formed by drawing and stretching an amorphous thermoplastic polyester resin sheet at a glass transition temperature ± 20 ° C. of the thermoplastic polyester resin, and then a temperature higher than the drawing stretching temperature. The total stretch ratio is a long thermoplastic polyester resin sheet that is uniaxially stretched in the length direction uniaxially stretched at 3 to 8 times.

  Examples of the thermoplastic polyester resin include polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyglycolic acid, poly (L-lactic acid), poly (3-hydroxybutyrate), and poly (3-hydroxybutyrate). / Hydroxyvalerate), poly (ε-caprolactone), polyethylene succinate, polybutylene succinate, polybutylene succinate adipate, polybutylene succinate / lactic acid, polybutylene succinate / carbonate, polybutylene succinate / terephthalate, poly Examples include butylene adipate / terephthalate, polytetramethylenadipate / terephthalate, and polybutylene succinate / adipate / terephthalate. Terephthalate is preferable.

  If the intrinsic viscosity of the thermoplastic polyester-based 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 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. Since it may become difficult, 0.1-5 mm is preferable.

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

  The method for drawing and stretching the amorphous polyester resin sheet in the amorphous state is not particularly limited, and may be drawn and drawn through a drawing die having a predetermined clearance, but is drawn and drawn through a pair of rolls. It is preferable because the thickness after stretching can be freely controlled and wear of a specific part of the drawing die does not occur.

  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 thermoplastic polyester resin sheet may not reach a predetermined temperature. Therefore, the glass transition temperature of the thermoplastic polyester resin −20 ° C. to the glass transition of the thermoplastic polyester resin. Temperature + 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 may be cut first even if it is to be drawn. On the contrary, when the temperature becomes high, the thermoplastic polyester resin sheet becomes soft and the sheet is cut by the tension that pulls out the sheet. Therefore, the glass transition temperature of the thermoplastic polyester resin is ± 20 ° C. It is a temperature range, Preferably it is the temperature range of the glass transition temperature of a thermoplastic polyester-type resin-the glass transition temperature of a thermoplastic polyester-type resin +10 degreeC.

  In addition, when the amorphous polyester resin sheet in the amorphous state is pulled out, the roll does not need to be rotated. However, particularly when the thickness of the thermoplastic polyester resin sheet is thick, the heat storage of the roll by shearing heat generation. Therefore, it is preferable to rotate the sheet in the drawing direction.

  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 the thermoplastic polyester resin sheet is thin, the cooling effect by the roll is great, so the rotation speed of the roll may be slow.

  The draw ratio of the above-described drawing stretching is not particularly limited. However, if the stretching ratio is low, a sheet excellent in tensile strength and tensile elastic modulus cannot be obtained. If the stretching ratio is high, the sheet tends to break during stretching. 2-9 times is preferable, More preferably, it is 2.5-7 times.

  The thermoplastic polyester resin sheet that has been drawn and stretched is uniaxially stretched at a temperature higher than the temperature of the drawing and stretching.

  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 an impediment 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, the uniaxial stretching of the drawn and drawn thermoplastic polyester resin sheet at a temperature higher than the drawing and drawing temperature increases the degree of crystallinity without relaxation, and the orientation is easy even when heated. Thus, a stretched thermoplastic polyester resin sheet having excellent heat resistance that is not relaxed by the heat treatment can be 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 during the uniaxial stretching may be higher than the drawing stretching temperature, but if it is too high, the primary stretched thermoplastic polyester resin sheet is melted and cut. A 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 in 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. However, if the stretching ratio is low, an excellent sheet such as tensile strength and tensile elastic modulus cannot be obtained. If the stretching ratio is high, the sheet tends to break during stretching. Therefore, 1.05-3 times are preferable, More preferably, it is 1.1-2 times.

  Moreover, since the absolute value of a linear expansion coefficient will become large if the total draw ratio of drawing extending | stretching and uniaxial stretching is too small or too large, 2.5 to 10 times are preferable, More preferably, it is 3 to 8 times.

  In the present invention, in order to improve heat resistance, it is preferable to heat-set the stretched thermoplastic polyester resin sheet that has been uniaxially stretched at a temperature higher than the uniaxial stretch temperature.

  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.

  Further, when heat-fixing, the stretched thermoplastic polyester resin sheet is stretched if a large tension is applied, and is not tensioned or shrinks in a very small state. It is preferable to carry out in a state where the length in the stretching direction is not substantially changed, 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 that the temperature is set to be .95 to 1.1 and heat fixed.

  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 if it is heated to a temperature higher than the glass transition temperature, the mechanical properties such as elastic modulus may decrease. And 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 to anneal by setting it to be 0 or less.

  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.

  Stretched thermoplastic polyester resin sheet protects against impact and cracking along the stretch direction, and polyester resin is directly exposed to rainwater and sunlight, resulting in hydrolysis and deterioration, reducing durability In order to prevent this, a thermoplastic resin or a paint may be laminated on the stretched thermoplastic polyester resin sheet.

  However, when a thermoplastic resin or a paint is laminated, the absolute value of the linear expansion coefficient of the stretched thermoplastic polyester resin sheet is increased. Therefore, it is preferable to form a thin layer of about 0.1 to 3 mm.

  Examples of the thermoplastic resin include hard vinyl chloride resin, chlorinated vinyl chloride resin, chlorinated polyethylene resin, ABS resin, AES resin, styrene resin, AS resin, methyl methacrylate resin, polyethylene resin, and polypropylene resin. . Examples of the paint include fluorine paint, acrylic silicon paint, urethane paint, and the like.

  The method for laminating the thermoplastic resin layer on the stretched thermoplastic polyester resin sheet is not particularly limited, and any conventionally known laminating method may be employed. For example, a method of melt extrusion coating a thermoplastic resin, an adhesive And the like.

In the present invention, the longitudinal uniaxially stretched elongated thermoplastic polyester resin sheet is made to pass through the slit of the plurality of plates slits of a predetermined shape is formed by an elongated thermoplastic polyester resin sheet However, the plate is not particularly limited, and for example, a plate made of an iron block can be used.

As the slit shape of the plate goes from the upstream to the downstream direction, the planar shape is gradually changed to the cross-sectional shape of the irregular long shaped body. That is, the long thermoplastic polyester resin sheet is deformed little by little each time it passes through one plate (slit), and when it passes through the last plate (slit), the atypical long molded body to be manufactured It is set to be a shape.

  The number of plates is not particularly limited, and a large number of plates are required if the shape of the atypical long molded body to be manufactured becomes complicated, but in the case of rain gutters, 5 to 20 plates are preferable.

In the present invention, only the position where the long thermoplastic polyester resin sheet is deformed is heated so as to be deformable. In other words, by passing through the slit of the plate, it is shaped so as to follow the shape of the slit, and only the shaping position is heated so as to be deformable. The heating method is not particularly limited, and any conventionally known heating method can be used. For example, a method in which hot air is blown from a nozzle only at a position where a long thermoplastic polyester resin sheet is shaped, a long thermoplastic polyester type The method etc. which press the heating roll made to contact only the position where the resin sheet forms are pressed against the long thermoplastic polyester resin sheet. In addition, you may perform the said heating, heating the whole long thermoplastic polyester-type resin sheet suitably in a heating tank.

Next, the long thermoplastic polyester resin sheet is shaped so as to follow the shape of the slit through the plate (the slit). Since the long thermoplastic polyester resin sheet is uniaxially stretched in the length direction, back tension may be applied to prevent thermal contraction when heating and shaping. The strength of the back tension may be set so that the long thermoplastic polyester resin sheet does not stretch or contract. The method of back tension is not particularly limited, and examples thereof include a method of applying a resistance load with a powder brake, an air shaft, a triple roll, or the like. In addition, when the cross-sectional shape of the atypical long shaped product to be manufactured is complex or the shape to be shaped has a large angle, the long thermoplastic polyester resin sheet receives resistance on the wall surface within the clearance of the slit and heats it. Since contraction is controlled, there is no need to apply back tension.

By shaping in this way, a deformed long shaped body having a predetermined shape deformed along the extending direction of the long thermoplastic polyester resin sheet is obtained, and particularly, a rain gutter is suitably obtained.

The structure of the manufacturing method of the atypical long molded article of the present invention is as described above, and the long thermoplastic polyester resin sheet that is uniaxially stretched in the length direction is not cracked along the stretch direction and shrinks. The resulting atypical long shaped product has a low coefficient of linear expansion, is lightweight, has excellent impact resistance, durability, workability, etc. It can be suitably used as a building material.

  Next, examples of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the following examples.

FIG. 1 is an explanatory side view showing an example of a method for producing an odd long molded article of the present invention, and FIG. 2 is an explanatory plan view. Figure 1 is a feed roll of the long thermoplastic polyester resin sheet is uniaxially stretched in the longitudinal direction, 10 is elongated thermoplastic polyester resin sheet is uniaxially stretched in the longitudinal direction is unwound is there.

In the figure, reference numeral 2 denotes a heating tank, and hot air supply devices 3, 31, 32, and 33 each having a nozzle at the tip are installed in the heating tank 2. The hot air supply devices 3, 3, 31, and 31 are installed above the long thermoplastic polyester resin sheet 10, and the hot air supply devices 3, 3 and the hot air supply devices 31, 31 are each a long thermoplastic polyester resin. It arrange | positions so that a hot air can be supplied to the same position (position which deform | transforms) of the sheet | seat 1 in the length direction. The hot air supply devices 32, 32, 33 and 33 are installed below the long thermoplastic polyester resin sheet 10, and the hot air supply devices 32 and 32 and the hot air supply devices 33 and 33 are respectively long thermoplastic polyesters. It arrange | positions so that a hot air can be supplied to the same position (position to deform | transform) of the length direction of the system resin sheet 1. FIG. Moreover, the hot air supply devices 3 and 3 and the hot air supply devices 32 and 32 and the hot air supply devices 31 and 31 and the hot air supply devices 33 and 33 are respectively in the same position in the length direction of the long thermoplastic polyester resin sheet 10 (deforms. Position) so that hot air can be supplied from above and below.

Reference numerals 4, 5, 6, 7, 8 and 9 are plates installed on the downstream side of the heating tank 2. As shown in FIGS. 3 to 8, slits 41, 51, 61, 71, 81 and 91 are formed in the plates 4, 5, 6, 7, 8 and 9, respectively. The slit 41 is almost flat, and the position for shaping the long thermoplastic polyester resin sheet 10 is slightly bent. The angles between the slits 41 to 51, 61, 71, 81, 91 and the bent portions are gradually made smaller, and the shape of the slit 91 is the shape of the odd long molded body 20 to be manufactured.

That is, the long thermoplastic polyester resin sheet 10 having a flat shape fed out from the heating tank 2 is slightly heated by the hot air supply devices 3, 31, 32, 33 by the slit 41 as shown in FIG. Only bend. Next, as shown in FIG. 4, the slightly bent position of the long thermoplastic polyester resin sheet 10 is slightly bent by the slit 51. Further, as shown in FIGS. 5 to 6, the bent portion of the long thermoplastic polyester resin sheet 10 is gradually bent by the slit 61, the slit 71, the slit 81, and the slit 91 so that the bending angle becomes gradually smaller. A long molded body 20 is obtained.

Example 1
Polyethylene terephthalate sheet (crystallinity 1.3%) obtained by melt-extrusion molding of polyethylene terephthalate (trade name “NEH-2070”, manufactured by Unitika Ltd., intrinsic viscosity 0.88) and quenching ) Is supplied to a stretching device (manufactured by Kyowa Engineering Co., Ltd.), preheated to 80 ° C., then drawn between a pair of rolls heated to 74 ° C. (roll interval 0.6 mm) at a speed of 2 m / min, and drawn. Further, the surface temperature of the polyethylene terephthalate sheet was heated to 180 ° C. in a hot air heating tank, and roll stretching was performed at an outlet speed of 2.5 m / min to obtain a stretched polyethylene terephthalate sheet having a stretching ratio of about 4 times.

  The polyethylene terephthalate sheet has a glass transition temperature of 76.7 ° C., a rising temperature of the crystallization peak in a differential scanning calorimetry curve measured at a heating rate of 10 ° C./min, about 118 ° C., and a rising temperature of the melting peak. Was about 230 ° C.

  The obtained stretched polyethylene terephthalate sheet was supplied to a hot air heating tank having a line length of 10 m set at 200 ° C. with a pinch roll installed at an inlet speed of 2.5 m / min, and an outlet speed of 2.75 m / min. Setting and heat setting were performed to obtain a heat-set stretched polyethylene terephthalate sheet. The length of the stretched thermoplastic polyester resin sheet that was heat-set was 1.00 times the length of the stretched thermoplastic polyester resin sheet before heat setting.

  The heat-set stretched polyethylene terephthalate sheet is supplied at a inlet speed of 2.75 m / min to a hot-air heating tank having a line length of 14 m, which is set at 90 ° C. and is set at 90 ° C., and an outlet speed of 2.7 m / min. Annealing was performed to obtain an annealed stretched polyethylene terephthalate sheet. The length of the annealed stretched thermoplastic polyester resin sheet was 0.98 times the length of the stretched thermoplastic polyester resin sheet before annealing.

Using the obtained stretched thermoplastic polyester resin sheet, the coefficient of linear expansion was measured in accordance with JIS K 7197. It was -0.34 × 10 ⁻⁵ (/ ° C.), and the tensile test method of JIS K 7113 was used. The tensile modulus was measured at 23 ° C. and 50% RH in accordance with the result, and it was 8.7 GPa. The linear expansion coefficient was determined by holding the obtained stretched thermoplastic polyester resin sheet at 0 ° C. and 50% RH for 24 hours, then measuring the length with a micrometer, and then at 60 ° C. and 50% RH. After holding for 24 hours, the length was measured with a micrometer and calculated from the difference.

When the obtained stretched thermoplastic polyester resin sheet was supplied to the above-mentioned apparatus and shaped under the following conditions, the stretched thermoplastic polyester resin sheet did not crack or contract along the stretching direction, and had a bowl shape. An irregular long molded product was obtained.
Feeding speed of stretched thermoplastic polyester resin sheet 1.2 m / min Hot air from hot air feeding devices 3, 31, 32, 33 Temperature 130 ° C., Supply rate 10 m ³ / min Take-up speed of odd-shaped long molded body 1.2 m / min Min

When the coefficient of linear expansion was measured in accordance with JIS K 7197 using the obtained atypical long shaped product, it was -0.33 × 10 ⁻⁵ (/ ° C.) and in accordance with the tensile test method of JIS K 7113. The tensile modulus at 23 ° C. and 50% RH was measured and found to be 7.9 GPa.

It is side explanatory drawing which shows an example of the manufacturing method of the unusual shape long molded object of this invention. It is plane explanatory drawing which shows an example of the manufacturing method of the unusual shape long molded object of this invention. It is a fragmentary sectional view explaining the state where a long thermoplastic polyester resin sheet is bent by a plate (slit). It is a fragmentary sectional view explaining the state where a long thermoplastic polyester resin sheet is bent by a plate (slit). It is a fragmentary sectional view explaining the state where a long thermoplastic polyester resin sheet is bent by a plate (slit). It is a fragmentary sectional view explaining the state where a long thermoplastic polyester resin sheet is bent by a plate (slit). It is a fragmentary sectional view explaining the state where a long thermoplastic polyester resin sheet is bent by a plate (slit). It is a fragmentary sectional view explaining the state where a long thermoplastic polyester resin sheet is bent by a plate (slit).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Feeding roll 2 Heating tank 3, 31, 32, 33 Hot-air supply apparatus 4, 5, 6, 7, 8, 9 Plate 41, 51, 61, 71, 81, 91 Slit 10 It is uniaxially stretched in the length direction. Long thermoplastic polyester resin sheet 20 Atypical long molded body

Claims (14)

An amorphous thermoplastic polyester resin sheet is drawn and stretched at a glass transition temperature ± 20 ° C. of the thermoplastic polyester resin, and then the total draw ratio is 3 to 8 times at a temperature higher than the drawing temperature. Only the position where the long thermoplastic polyester resin sheet that has been uniaxially stretched and uniaxially stretched in the length direction is deformably heated, and is passed through the slits of a plurality of plates on which slits of a predetermined shape are formed. This is a method for producing an irregular long molded body that shapes a long thermoplastic polyester resin sheet, and the cross sectional shape of the irregular long molded body gradually from a planar shape as the slit shape of the plate goes from upstream to downstream. The manufacturing method of the unusual long shape molded object characterized by the above-mentioned.   2. The method for producing an irregular long molded article according to claim 1, wherein the irregular long molded article is a rain gutter. 3. The method for producing an irregular long molded article according to claim 1, wherein the stretched thermoplastic polyester resin sheet has a tensile modulus of 7 to 15 GPa . The atypical long molded article according to any one of claims 1 to 3, wherein the amorphous polyester sheet has a crystallinity of less than 10% as measured by a differential scanning calorimeter. Manufacturing method. The method for producing an odd long molded article according to any one of claims 1 to 4, wherein the drawing stretching is performed between a pair of rolls . The amorphous polyester resin sheet in an amorphous state is preheated at a temperature between the glass transition temperature of the thermoplastic polyester resin of −20 ° C. to the glass transition temperature of the thermoplastic polyester resin of + 10 ° C. and then drawn and stretched. 6. The method for producing an odd long shaped product according to claim 5, The thermoplastic polyester resin sheet is characterized in that the roll is rotated in the drawing direction at a speed substantially equal to or lower than the feed speed when the roll is not rotated at the same drawing speed. The manufacturing method of the atypical elongate molded object of Claim 5 or 6 . The uniaxial stretching temperature is a rising temperature of a crystallization peak of a thermoplastic polyester resin to a rising temperature of a melting peak in a differential scanning calorimetry curve measured at a heating rate of 10 ° C / min. 8. A method for producing an irregular long molded article according to any one of items 7 to 9 . 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 of the uniaxially stretched stretched thermoplastic polyester resin sheet measured at a heating rate of 10 ° C./min, Heat-fixing at a temperature not higher by 30 ° C. or more than the uniaxial stretching temperature, the method for producing an odd long molded article according to any one of claims 1 to 8 . The method for producing an odd long molded article according to claim 9, wherein the heat setting is performed in a state in which the length of the uniaxially stretched stretched thermoplastic polyester resin sheet does not substantially change . 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-fixing . A method for producing an irregular long molded body. The method for producing an irregular long molded article according to any one of claims 9 to 11, wherein the heat setting time is 10 seconds to 10 minutes . Furthermore, the stretched thermoplastic polyester resin sheet that has been heat-fixed is within the range of the rising temperature of the crystallization peak of the thermoplastic polyester resin in the differential scanning calorimetry curve measured at a glass transition temperature to a heating rate of 10 ° C./min. The method for producing an odd long molded article according to any one of claims 9 to 12, wherein annealing is performed in a state where substantially no tension is applied . The method for producing a modified long shaped product according to claim 13, wherein the annealing time is 10 seconds or more .

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