JP4355938B2 - Conductive plastic sheet manufacturing equipment - Google Patents

Description

  The present invention relates to an apparatus for producing a conductive plastic sheet for heating a floor such as floor heating, a nursery, or a pig or chicken farm.

  2. Description of the Related Art Conventionally, there is a floor heating apparatus in which a sheet heating element is laid on a joist or a concrete floor under a floor of a house via a heat insulating material, and a floor board or the like is laid thereon. Various floor heating elements are used in this floor heating device, but are roughly classified into a heat medium heating type and an electric heating type.

  The floor heating device of the heating medium heating type forms a zigzag-shaped heat generation pattern groove on the upper surface of a heat insulating sheet made of synthetic resin foam laid on a joist or concrete floor surface, and a polyethylene pipe or a copper pipe is formed in this groove After the arrangement, a heat medium heated by a boiler is supplied from one of the pipes, and is returned to the boiler from the other.

  In this type of floor heating system, the heat medium supplied from the boiler dissipates heat and decreases in temperature as it travels through the pipe. Therefore, if the temperature of the heat medium supplied to the pipe is not significantly increased, the amount of heat required is reduced. Cannot be released indoors. Moreover, since the temperature decreases as the heat medium travels through the pipe, temperature unevenness is likely to occur on the floor surface.

  By the way, there is a period in which heating is not required from the end of spring to early autumn, but during this period, the heat medium is not flowed, so the heat medium in the pipe may be altered or filth-like things may occur. When this adheres to the inner surface of the pipe, the pipe is gradually closed. Also, the pipe itself gradually deteriorates.

  Therefore, the life of the heating medium heating type floor heating apparatus is usually said to be about 6 to 8 years. When exchanging pipes, it is necessary to peel off the floor after moving the furniture in the room, so that a long period of time is required for repair, and during that time, there is a problem that an inconvenient life is forced.

  On the other hand, an electric heating type floor heating apparatus is a laminate in which a metal foil is laminated on an insulating sheet such as a plastic sheet and this metal foil is etched to form a heat generation pattern, or a heat generation pattern groove on the upper surface of a thick insulation sheet. In this heat generation pattern groove, a nichrome wire with insulation coating is inserted on the outer periphery.

  Further, there is a plastic material in which a pellet obtained by mixing fine carbon powder is melted and formed into a sheet shape. The manufacturing method of the molded body heating element is a so-called tubular system, in which molten plastic is extruded into a cylindrical shape from an annular nozzle attached to an extrusion molding machine, and at the same time, two electrodes are placed inside the cylindrical body. While being sent out, when the molded body is in a softened state, it is pressed between two pinch rolls to form a flat plate, and electrode wires are held between both ends thereof. And it cools rapidly, forming the electrical joining state between an electrode wire and a molded object, and the flat sheet-like planar heating element is manufactured (for example, refer patent document 1).

  According to the experience of the present inventors, this method is desirable if the cylindrical body has a diameter of 60 to 220 mm and a thickness of about 0.8 to 1.5 mm and a relatively narrow sheet width. It is possible to manufacture a sheet heating sheet having electrical resistance.

  Therefore, what is sold as a standard planar heat generating sheet has a sheet width of 200 mm, a length of 2500 mm, and power consumption of 100 to 200 W per sheet. When the surface temperature of the 6 tatami floor is heated to 40 ° C. using this sheet heating sheet, five sheet heating elements are laid in parallel. The power is about 1.2 kW.

  In this way, when a large number of planar heating elements are used, the lead cables connected to the electrode wires of the individual planar heating elements are wired near the floor of the room being heated. Wiring work is complicated because it is necessary to connect to the cable. Furthermore, since it is necessary to arrange a temperature fuse and a temperature sensor for each planar heating element, there is a problem that the construction cost increases in addition to the complexity of the wiring.

For example, in the case of constructing floor heating in a Japanese house, first, a heat insulating material is laid in a predetermined range on the joist board. Next, a power feeding cable is wired around the place where the sheet heating sheet is laid, and the sheet heating sheet is laid at a predetermined position on the heat insulating material. Next, after connecting the power supply cable and the electrode of the sheet heating sheet, the power supply cable is connected to the leakage breaker. A soaking plate made of a metal plate such as an aluminum plate is laid on the sheet-like heat generating sheet so as to generate a heat flow on the floor side and eliminate temperature unevenness, and finally, a flooring material on the surface. To complete the floor heating system.
Japanese Patent Publication No. 54-123463

  As can be seen from the above explanation, the construction of installing a floor heating system in a Japanese house includes carpenter work for processing joist etc., electrical work for laying a sheet heating sheet and connecting it to the power supply cable, and floor surface Carpenter work such as finishing work and interior work such as wall covering are required.

  Each of these constructions requires specialized workers to perform stepwise and partial work according to the daily adjustment. For this reason, the construction period becomes longer, the work is delayed, and the subsequent work is gradually hindered.

  Also, considering the relationship between the material cost and the construction cost, the construction cost for the heating floor is 1 if the material cost for the sheet heating sheet etc. is 1, and the installation cost including the electrical work is 1.5. The installation cost is considerably higher than the material cost of the heat generating sheet.

  Now, if a sheet heating sheet having a width wider than a conventional heating sheet having a width of 200 mm, for example, about 500 mm, is prepared, the number of sheets to be installed is reduced to half or less, and electrical work is performed. By employing a wire connection device (waterproof connector) that can be easily connected by an operator other than a worker, for example, a carpenter, it is possible to relatively reduce the material cost of floor heating and the laying cost.

  In addition, the number of sheet heating elements laid on the floor is reduced, the length of wiring and the number of connection points are reduced, and further, the number of thermal fuses and temperature sensors is reduced, reducing the equipment cost while improving safety. It is possible to make it.

  In this sense, manufacturing a sheet having a width wider than that of a conventional sheet heating sheet, preferably 2 to 3 times, has a great meaning in installing a floor heating facility at a low cost.

  However, in the conventional tubular system, the structure of the adjusting means for adjusting the discharge slit of the annular base for forming the cylindrical body having a predetermined thickness is extremely complicated, and its operation is difficult.

  This is because not only is it difficult to accurately form an annular slit having a predetermined diameter, but it is also difficult to adjust the gap between the individual slits. In addition, when the interval of a certain portion is adjusted, adjacent portions are affected and the gap changes, making it difficult to form a highly accurate cylindrical body.

  Therefore, the manufacture of the sheet by the tubular method is limited to uses such as an agricultural film and a film for a super packaging bag, which are not particularly sensitive to thickness accuracy.

  In addition, the conventional apparatus has a problem on the apparatus such as it is difficult to stably insert the electrode wires arranged on both sides of the conductive plastic sheet, and an operation problem that it is difficult to operate stably. It was.

  Further, when it is desired to slightly increase the thickness of the conductive plastic sheet in the portion where the electrode wire is disposed, it is difficult to adjust the slit of the annular base. For these reasons, it has been substantially difficult to scale up a conventional tubular apparatus as it is.

  The present invention has been made to solve these problems, and an object of the present invention is to provide a conductive plastic sheet manufacturing apparatus capable of doubling the conductive plastic sheet applied to the heating element on the surface. There is to do.

  In order to solve the above problems, the present invention is configured as follows.

  The conductive plastic sheet manufacturing apparatus according to claim 1 introduces conductive molten plastic into a plurality of branch paths branched from the main flow path, and extrudes them from a base having two slits in parallel. A conductive sheet for forming a sheet and forming one conductive plastic sheet sandwiching the electrode lines by pressing and bonding the molded sheet while introducing a plurality of electrode lines between the two molded sheets In the conductive plastic sheet manufacturing apparatus, a plurality of units of the die are arranged in one mold device, and a flow rate adjusting unit is provided in the branch passage communicating with the die to control the flow rate of the conductive molten plastic for each unit. It is an electroconductive plastic sheet manufacturing apparatus characterized by adjusting.

  The conductive plastic sheet manufacturing apparatus according to claim 2 is provided with a plurality of pressing roll portions corresponding to the caps on the downstream side of the mold device, and the plurality of pressing roll portions at the same or different speeds. 2. The conductive plastic sheet manufacturing apparatus according to claim 1, wherein the apparatus is operated.

  The conductive plastic sheet manufacturing apparatus according to claim 3 is a conductive plastic sheet manufacturing apparatus according to claim 1, wherein the temperature of the mold apparatus is adjusted for each unit.

  The conductive plastic sheet manufacturing apparatus according to claim 4 is provided with a fan-shaped runner groove that opens in the width direction of the base in the branch path so as to relieve the pressure of the molten plastic for each unit. The conductive plastic sheet manufacturing apparatus according to claim 1.

  The conductive plastic sheet manufacturing apparatus according to claim 5 includes: a metal fitting formed by a connecting metal fitting connected to an extruder, a flow dividing metal fitting having a plurality of branch paths, and a metal fitting forming a molten plastic into a sheet shape; The molding device is formed by a pressing roll portion provided on the downstream side of the mold apparatus, and the molded metal fitting is formed by a metal core and metal fittings disposed on both sides thereof, and the metal core and the metal fitting are combined. In the conductive plastic sheet manufacturing apparatus provided with a runner groove, a throttle valve, a slit portion and a base on the surface, and further provided with a guide hole for guiding an electrode wire in the core metal, the runner groove is formed in an inverted V shape. And formed with a front stage part connected to the branch path and a rear stage part connected to the front stage part, and further, the thickness of the front stage part gradually becomes thicker as it approaches the rear stage part, and the rear stage Part Maintaining the same thickness, the slit portion is composed of a gently curved central portion and two extending portions extending from both end portions toward the oblique wake side, and has an overall inverted V shape. The formed second runner groove is provided in one or more stages, a plurality of guide holes for guiding the electrode wires are provided in the core metal, and a plurality of cutters are provided on the downstream side of the pressing roll portion. It is an electroconductive plastic sheet manufacturing apparatus provided with the space | interval.

  The conductive plastic sheet manufacturing apparatus according to claim 1 introduces conductive molten plastic into a plurality of branch paths branched from the main flow path, and extrudes them from a base having two slits in parallel. A conductive sheet for forming a sheet and forming one conductive plastic sheet sandwiching the electrode lines by pressing and bonding the molded sheet while introducing a plurality of electrode lines between the two molded sheets In the conductive plastic sheet manufacturing apparatus, a plurality of units of the die are arranged in one mold device, and a flow rate adjusting unit is provided in the branch passage communicating with the die to control the flow rate of the conductive molten plastic for each unit. It is characterized by adjusting.

  Accordingly, it is possible to double the conductive plastic sheet having a wider sheet width than the conventional tubular system without significantly modifying the existing apparatus.

  In addition, as described above, since the present invention is provided with a plurality of bases in one mold device, by adjusting the slit width of each base according to the characteristics and applications of the planar heating element, In the unit, a conductive plastic sheet having a standard sheet thickness can be manufactured, and in the other unit, a conductive plastic sheet having a special sheet thickness can be manufactured. Furthermore, in one unit, a conductive plastic sheet having a thicker sheet than the standard product can be manufactured, and in the other unit, a conductive plastic sheet having a thinner sheet than the standard product can be manufactured.

  Furthermore, in the case of a wide conductive plastic sheet, a wide conductive plastic sheet as if a plurality of planar heat generating sheets were joined side by side by arranging electrode wires in the middle of the conductive plastic sheet. Can be manufactured. When this special conductive plastic sheet is used, the manufacturing price and the construction cost can be reduced as compared with the case where a conventional sheet heating element is used. Moreover, it can be laid efficiently.

  The conductive plastic sheet is mainly used as a planar heating element such as floor heating, and the heat generation temperature is 50 ° C. or lower, preferably 45 ° C. to 40 ° C. Various plastic resins can be used. For example, polypropylene, polyethylene, polybutene and the like can be preferably used.

  In addition, the present invention basically extrudes two flat sheets and laminates and bonds them in a softened state to form one sheet-like heat generating sheet. A sheet heating element coated with an insulating sheet can be manufactured by extruding sheets made of insulating plastic on both sides of the sheet heating sheet to form a laminate structure.

  Moreover, although the linear slit of the die is formed in two parallel stages, it can be formed in a plurality of stages more than that and can be a multilayer structure sheet. Moreover, since adjustment of the space | interval of a slit is also easy, the thing of the thickness which has the optimal electrothermal characteristic as a planar heating sheet can be manufactured.

  The conductive plastic sheet manufacturing apparatus according to claim 2 is provided with a plurality of pressing roll portions corresponding to the caps on the downstream side of the mold device, and the plurality of pressing roll portions at the same or different speeds. Since it operates, when several press roll parts are the same speed, the conductive plastic sheet which has a sheet width of about 2-3 times compared with the conventional tubular system can be doubled.

  On the other hand, when the speed of the pressing roll part is different, one unit can produce a standard product, and the other unit can produce a special conductive plastic sheet having different electrothermal characteristics and the like compared to the standard product. .

  The conductive plastic sheet manufacturing apparatus according to claim 3 is characterized in that the temperature of the mold apparatus is adjusted for each unit, so that the thickness or manufacturing speed of the molded sheet is changed for each unit. But it can respond quickly.

  The conductive plastic sheet manufacturing apparatus according to claim 4 is provided with a fan-shaped runner groove that opens in the width direction of the base in the branch path, so that the pressure of the molten plastic is relieved for each unit. A good molded sheet that is homogeneous in the sheet width direction can be easily formed.

  The conductive plastic sheet manufacturing apparatus according to claim 5 includes: a metal fitting formed by a connecting metal fitting connected to an extruder, a flow dividing metal fitting having a plurality of branch paths, and a metal fitting forming a molten plastic into a sheet shape; The molding device is formed by a pressing roll portion provided on the downstream side of the mold apparatus, and the molded metal fitting is formed by a metal core and metal fittings disposed on both sides thereof, and the metal core and the metal fitting are combined. In the conductive plastic sheet manufacturing apparatus provided with a runner groove, a throttle valve, a slit portion and a base on the surface, and further provided with a guide hole for guiding an electrode wire in the core metal, the runner groove is formed in an inverted V shape. And formed with a front stage part connected to the branch path and a rear stage part connected to the front stage part, and further, the thickness of the front stage part gradually becomes thicker as it approaches the rear stage part, and the rear stage Part Maintaining the same thickness, the slit portion is composed of a gently curved central portion and two extending portions extending from both end portions toward the oblique wake side, and has an overall inverted V shape. The formed second runner groove is provided in one or more stages, a plurality of guide holes for guiding the electrode wires are provided in the core metal, and a plurality of cutters are provided on the downstream side of the pressing roll portion. It is characterized by being provided at intervals.

  Therefore, the molten plastic supplied from the extruder is expanded in the width direction by the inverted V-shaped runner groove provided on the mating surface of the core metal and the metal fitting. As shown in FIG. 2, the front stage part connected to the branch path and the rear stage part connected to the front stage part are formed, and the thickness of the front stage part is made closer to the rear stage part. Therefore, the thickness is gradually increased, and the latter portion is configured to maintain the same thickness. Therefore, even if the lateral width of the die is increased more than twice the conventional width, the molten plastic supplied from the extruder is smooth in the width direction. It is spread and is equalized.

  Further, according to the present invention, since the slit portion is provided with one or more stages in the inverted V-shaped second runner groove, the molten plastic squeezed by the throttle valve has a so-called “reservoir portion” action. The pressure can be equalized again by the second runner groove. As a result, a conductive plastic sheet having a uniform sheet thickness can be accurately manufactured even when the lateral width of the die is greatly increased.

  In addition, since a plurality of guide holes for guiding the electrode wires are provided in the core metal, and a plurality of cutters are provided at a predetermined interval on the downstream side of the pressing roll portion, the wide width pressed and bonded by the pressing roll portion is provided. By cutting the conductive plastic sheet in the longitudinal direction with a cutter, a plurality of conductive plastic sheets having a predetermined sheet width can be manufactured simultaneously.

Next, embodiments of the present invention will be described with reference to the drawings.
(1) First Embodiment First, the first embodiment will be described. In FIG. 3, reference numeral 1 denotes a double-type conductive plastic sheet manufacturing apparatus, a mold apparatus 9 constituted by a connecting metal fitting 2, a flow dividing metal fitting 3, and a sheet forming metal fitting 4 connected to an unillustrated extruder, A plurality of (two sets) pressing roll portions 14 are provided on the downstream side of the mold apparatus 9.

  This conductive plastic sheet manufacturing apparatus 1 has a plurality of sets (two sets) in which the sheet metal fittings 4 including the caps 5a and 5b are unitized and unitized into one mold apparatus 9 for mass production of the conductive plastic sheet S3. ) Is formed adjacent to the width direction (lateral direction).

  The mold apparatus 9 is provided with a heat insulating material 13 between adjacent sheet forming metal parts 4 so as to cut off heat transfer. Each of the sheet metal fittings 4 can be controlled in temperature. Moreover, although the press roll part 14 is normally drive | operated at the same speed by the drive motor 15, it is also possible to drive | operate at a mutually different speed | rate. In that case, the clutch 16 is released.

  As shown in FIG. 2, the connection fitting 2 is composed of a flange 2a and a connecting portion 2b, and a main passage 2c for guiding molten plastic (not shown) passes through the central portion thereof. Moreover, the flow dividing metal 3 is provided with a flow path 2d connected to the main passage 2c. This flow path 2d is provided with two sets of branch paths 2e and 2f. At the tip, as shown in FIG. 3, thick groove-like runner grooves 2g and 2h are provided in the width direction of the sheet-formed metal fitting 4, and melted. The pressure of plastic is relieved.

  As described above, the conductive plastic sheet manufacturing apparatus 1 is provided with two sets of sheet-molded metal fittings 4 adjacent to each other in the width direction in one mold apparatus 9, so that it is easy to understand. This unit will be described, and the configuration and operation of the other units will not be changed, and the description thereof will be omitted.

  As shown in FIG. 1, the sheet-molded metal fitting 4 is configured so that metal fittings 4 a and 4 b arranged on both sides of the core metal 10 are aligned. Runner grooves 2g and 2h, throttle valves 7a and 7b, slit portions 2i and 2j, and caps 5a and 5b are provided on the mating surfaces of the core 10 and the metal fittings 4a and 4b on both sides thereof. .

  In addition, throttle valves 7a and 7b for adjusting the flow rate of the molten plastic are disposed at important points on the mating surface (melted plastic flow path) between the core metal 10 and the metal fittings 4a and 4b. In addition, two flow rate adjusting valves 6a and 6b are provided in the branch paths 2e and 2f (see FIG. 3), and the flow rate of the molten plastic sent to the runner grooves 2g and 2h extending in the width direction of the sheet molded metal fitting 4 is provided. Is to adjust.

  Further, as shown in FIG. 1, straight throttle valves 7a and 7b are provided behind the runner grooves 2g and 2h formed in an inverted V shape, and a sheet is formed by the slit portions 2i and 2j. The flow of molten plastic that is developed into a shape is given a squeezing effect so as to form a uniform sheet-like flow as a whole.

  Also, the caps 5a and 5b facing the core metal 10 are provided on the sheet molding metal 4 so that the thickness of the discharge slit can be adjusted, and discharge is performed by adjusting the thickness of the conductive plastic sheets S1 and S2. It is like that.

  The flow rate adjusting valves 6a and 6b are structured to adjust the throttle amount of the flow path by moving the valve body back and forth with respect to the branch paths 2e and 2f. On the other hand, the throttle valves 7a and 7b are configured so that the straight valve bodies 7c and 7d are moved back and forth with respect to the planes provided on both sides of the core metal 10 to finely adjust the thickness of the discharged molten plastic. It is configured.

  The bases 5a and 5b are fixed to the metal fittings 4a and 4b constituting the sheet forming metal fitting 4 by a plurality of bolts 5c and 5d (see FIG. 4). Further, the thickness of the conductive plastic sheets S1 and S2 is adjusted by adjusting the distance to the core bar 10 with bolts 5e and 5f (see FIG. 1).

  As shown in FIG. 1, guide holes 11 a and 11 b that guide the electrode wires through the shunt metal fitting 3 and the sheet forming metal fitting 4 are opened through the central portion of the core metal 10. The guide pipes 12 a and 12 b are provided so as to protrude from the lower end surface of the sheet-molded metal fitting 4 in connection with the guide holes 11 a and 11 b. The flat electrode wires L1 and L2 having a fine space and improved adhesion to the plastic sheet immediately after discharge are formed by braiding a large number of thin copper wires into two conductive plastic sheets S1 and S2. Between the two and parallel to both sides thereof.

  As described above, the pressing roll portion 14 including the pair of pressing rolls 14a and 14b is provided in the vicinity of the downstream side of the sheet metal fitting 4, and the two discharged conductive plastic sheets S1 in the softened state. , S2 and the two electrode wires L1, L2 are pressed and integrated to form a conductive plastic sheet S3 suitable for a planar heating element used mainly for floor heating or the like.

  And in FIG. 1, it cools rapidly by spraying or immersing water in sheet | seat S3 actively by the cooling device 17 pulled out to the horizontal direction and arrange | positioned close to the shaping | molding apparatus 1 (it is normally immersed in cooling water). The temperature adjustment characteristic (positive characteristic) of the sheet S3 having a conductive structure is stabilized.

  The electrode wires L1 and L2 use a slightly flat braided wire braided by using a number of thin copper wires, and use a slight but stretchable length and width. is doing. The electrode lines L1 and L2 need to be stretchable rapidly when the plastic sheet S3 is cooled at a considerable rate (10 to 30% in the width direction and 4 to 9% in the length direction). This is because it shrinks and follows this.

  As described above, the soft plastic sheets S1 and S2 just discharged from the sheet metal fitting 4 are pressed by the pressing roll portion 14 and are suitable for a flat sheet heating element as shown in FIG. The conductive plastic sheet S3 is obtained.

  And when this electrically conductive plastic sheet S3 is cooled with the cooling device 17, as mentioned above, it shrinks considerably rather than the width discharged from the nozzle | cap | die 5a, 5b. Moreover, although it shrink | contracts also in a length direction, there exists an effect | action of the press roll part 14 about this, and the shrinkage amount is less than the width direction.

  Accordingly, it is preferable to use the sheet S1, S2 having a property that the electrode lines L1, L2 follow the contraction in the width direction and the length direction and contract, and the electrode line is not flexible. Is used, undulation is generated at both side edges of the conductive plastic sheet S3, resulting in a state like a comb. These corrections can be difficult and require caution.

  As described above, the conductive plastic sheet manufacturing apparatus 1 composed of a plurality of metal fittings is connected to an extrusion nozzle portion of a melt extruder (not shown). Various types of thermoplastic plastic can be used for the extruder, and among them, polypropylene, heat-resistant polyethylene, polybutene, and the like are preferable.

  The thermoplastic is made of pellets by adding about 15 to 30% of fine conductive carbon, for example, furnace black. In a mixer (not shown), the pellets are uniformly mixed, then supplied to the extruder, heated to a melting temperature of about 200 ° C. and melted. And as shown in FIG. 6, it discharges from a nozzle part and flows in into the main flow path 2c through the connection metal fitting 2 of the conductive plastic sheet manufacturing apparatus 1 of this invention. This conductive molten plastic is diverted from the flow path 2d of the diverter fitting 3 into the diversion flow paths 2e and 2f, and further flows into the runner grooves 2g and 2h of the sheet forming metal fitting 4 to be equalized at this portion.

  Then, the molten plastic pressure-equalized via the runner grooves 2g and 2h flows into the slit portions 2i and 2j formed on both surfaces of the cored bar 10, where it is widened in a sheet shape. Flowing. Then, two conductive plastic sheets S1 and S2 are continuously discharged from the slit formed by the caps 5a and 5b arranged at the lower end of the sheet forming metal fitting 4.

  On the other hand, electrode wires L1 and L2 formed of two braided wires are formed through guide holes 11a and 11b provided in the shunt fitting 3 and the sheet forming fitting 4 and guide pipes 12a and 12b provided in the sheet forming fitting 4. It is sent to both sides between the conductive plastic sheets S1 and S2 immediately after that, and then pressed by the pressing rolls 14a and 14b of the pressing roll unit 14 while being discharged from the caps 5a and 5b and still in the softened state. They are integrated with the lines L1 and L2 being sandwiched therebetween to form one conductive plastic sheet S3.

  The conductive plastic sheet S3 thus molded is particularly suitable for a planar heating element used for floor heating or the like, and the continuously molded sheet is cut into a predetermined length. Then, it is entirely covered with a covering cover made of a heat-resistant insulating sheet such as a thick polyester film or a polyethylene sheet, and then, the inside of the covering cover is degassed and sealed in a watertight manner to provide a strong planar heating element. Form. Then, lead wires are connected to the electrode wires L1 and L2 drawn from both edges of the conductive plastic sheet S3, and a waterproof connector that can be easily wired according to the application is fixed.

  The width of the conductive plastic sheet S3 manufactured according to the present invention is 400 to 530 mm and the thickness is 0.8 to 1.5 mm. Moreover, the length is about 2500 mm normally for the convenience of an application or laying work. In this case, the power consumption is about 500 W per sheet, and this power consumption has the characteristic that it flows at the maximum at the time of current inrush, gradually decreases with increasing temperature, and stabilizes at a predetermined temperature.

  In addition, two or more, for example, three (both sides and middle) electrode wires are provided in parallel on one conductive plastic sheet S3, so that two sheet-like heating elements are connected in parallel. Thus, the distance of the current flowing between the two electrodes and the heat generation amount can be adjusted.

  According to the present invention, the width of the conductive plastic sheet manufactured by the conventional method is about twice or more, so, for example, in the case of a floor heating device, the number of laying is reduced and the work is reduced. It becomes easy.

In addition, if wiring that can be easily connected to a connector, etc. is used, it is possible for anyone other than the electrician to perform the work, and it is necessary to carry out multiple tasks with different time differences as in conventional floor heating work. There is also an effect on the construction such as no longer.
(2) Second Embodiment Next, a second embodiment will be described. In FIG. 10, 1 is a conductive plastic sheet manufacturing apparatus developed for taking two sheets. As shown in FIG. 10, the conductive plastic sheet manufacturing apparatus 1 includes a mold device 9 including a connection fitting 2, a flow dividing fitting 3, and a sheet molding fitting 4 that are connected to an extruder (not shown). It is comprised by the wide press roll part (refer FIG. 10) 14 provided in the downstream.

  As shown in FIG. 8, the connecting fitting 2 is composed of a flange 2a and a connecting portion 2b, and a shaft 2 is provided with a main passage 2c for guiding molten plastic (not shown). Moreover, the flow dividing metal 3 is provided with a flow path 2d connected to the main passage 2c. This flow path 2d branches into two branch paths 2e and 2f, and at the tip thereof, there are provided thick groove-like runner grooves 2g and 2h (see FIG. 10) extending in the width direction of the sheet molded metal fitting 4. The pressure of the molten plastic is relieved.

  As shown in FIGS. 7 and 9, the sheet-molded metal fitting 4 is arranged so that the metal fittings 4 a and 4 b are aligned with both sides of the core metal 10. Runner grooves 2g and 2h, throttle valves 7a and 7b, slit portions 2i and 2j, and caps 5a and 5b are provided on the mating surfaces of the core 10 and the metal fittings 4a and 4b disposed on both sides thereof. ing. Further, as shown in FIG. 10, the slit portions 2i and 2j are provided with second runner grooves 2m and 2n in two upper and lower stages to reduce the pressure of the molten plastic after passing through the throttle valves 7a and 7b. .

  Further, the sheet forming metal fitting 4 includes a number of heaters and a temperature controller (not shown) so that the temperature in the width direction can be uniformly controlled.

  Flow control valves 6a and 6b are provided in the branch paths 2e and 2f (see FIGS. 7 and 8), and the flow rate of the molten plastic sent to the runner grooves 2g and 2h extending in the width direction of the sheet molded metal fitting 4 is controlled. It comes to adjust.

  As shown in FIG. 10, the runner grooves 2 g and 2 h extend from the front ends of the branch paths 2 e and 2 f to the left and right sides toward the left and right sides, and have an inverted V shape. The gradient (inclination angle) θ1 is preferably in the range of 10 ° to 15 °, and if it exceeds 15 °, the height of the runner grooves 2g and 2h themselves becomes high, which is uneconomical. On the other hand, when the angle is less than 10 °, unevenness may occur in pressure relaxation in the runner grooves 2g and 2h.

  Furthermore, as shown in FIG. 10, the runner grooves 2g and 2h are composed of two parts, a front stage part and a rear stage part, and the front stage parts 2g ′ and 2h ′ approach the rear stage parts 2g ″ and 2h ″. The area of the cross section (semi-circular shape) gradually increases. The rear step portions 2g ″ and 2h ″ located outside the front step portions 2g ′ and 2h ′ have the same cross-sectional (semi-circular) area. Furthermore, the lengths of the front stage portions 2g 'and 2h' of the runner grooves 2g and 2h are approximately ½ of the lateral width of the sheet molded metal fitting 4.

  As shown in FIGS. 7 and 9, straight throttle valves 7 a and 7 b are provided behind the runner grooves 2 g and 2 h (rear stream side), and developed into a sheet shape by the slit portions 2 i and 2 j. A squeezing effect is given to the flow of molten plastic, so that a uniform sheet-like flow is obtained as a whole.

  Then, the sheet forming metal fitting 4 is provided with bases 5a and 5b facing the lower end portion of the core metal 10, and the thickness (gap) of the discharge slit between the core metal 10 and the bases 5a and 5b is adjusted. ing.

  The bases 5a and 5b are fixed to the metal fittings 4a and 4b constituting the sheet forming metal fitting 4 by a plurality of bolts 5c and 5d (see FIG. 7). Further, the thickness of the conductive plastic sheets S1 and S2 is adjusted by adjusting the distance to the core bar 10 with bolts 5e and 5f (see FIG. 7).

  The flow rate adjusting valves 6a and 6b are structured to adjust the throttle amount of the flow path by moving the valve body back and forth with respect to the branch paths 2e and 2f. On the other hand, the throttle valves 7a and 7b are configured so that the straight valve bodies 7c and 7d are moved back and forth with respect to the flat portions formed on both surfaces of the core metal 10 to finely adjust the thickness of the molten plastic flowing down. ing.

  As shown in FIG. 10, the second runner grooves 2m and 2n are composed of a gently curved central portion 21 and elongated portions 22 extending from the end portion to the left and right sides obliquely downstream. It has an inverted V shape. The gradient (inclination angle) θ2 is preferably in the range of 15 ° to 20 °, and if it exceeds 20 °, the height of the runner grooves 2m and 2n itself is increased, which is uneconomical. On the other hand, when the angle is less than 15 °, unevenness may occur in pressure relaxation in the runner grooves 2m and 2n.

  As shown in FIG. 7, a plurality of sets (two sets in this example) of guide holes 11 a and 11 b that guide electrode wires, which will be described later, through the flow-dividing metal fitting 3 and the sheet-forming metal fitting 4, Is provided. The guide pipes 12 a and 12 b are provided so as to protrude from the end surface of the sheet-molded metal fitting 4 in connection with the guide holes 11 a and 11 b. These guide holes 11a and 11b and guide pipes 12a and 12b are provided adjacent to each other as shown in FIG.

  A number of thin copper wires are braided to form a fine space, and flat electrode wires L1 and L2 having improved adhesion to plastic are sent out between the two conductive plastic sheets S1 and S2, respectively. It is like that.

  The pressing roll portion 14 is composed of a pair of pressing rolls 14a and 14b, and two soft plastic conductive sheets S1 and S2 discharged from the caps 5a and 5b and two sets of electrode wires L1. , L2 are pressed and integrated to form a conductive plastic sheet S3 mainly used for floor heating or the like.

  As shown in FIG. 7, this conductive plastic sheet S3 is pulled out in the lateral direction, and water is actively sprinkled or immersed in the sheet S3 by a cooling device (not shown) arranged close to the molding apparatus 1. The sheet is cooled rapidly (usually immersed in cooling water for cooling) to stabilize the temperature control characteristic (positive characteristic) of the sheet S3 having a conductive structure.

  As described above, the electrode wires L1 and L2 use a slightly flat braided wire braided by using a number of thin copper wires. Preferably, the electrode wires L1 and L2 expand and contract in the length direction and the width direction. The one that gave sex is used.

  The electrode lines L1 and L2 need to be stretchable when the conductive plastic sheet S3 is cooled in a considerable proportion (10-30% in the width direction and 4-9% in the length direction). This is because it contracts rapidly, so that it can follow this.

  As described above, the soft conductive plastic sheets S1 and S2 that have just been discharged from the sheet metal fitting 4 are pressed by the pressing roll portion 14 to be a flat sheet heating element as shown in FIG. The conductive plastic sheet S3 is suitable for the above.

  And when this electrically conductive plastic sheet S3 is cooled by a cooling device (not shown), as described above, it contracts considerably more than the width discharged from the caps 5a, 5b. Moreover, although it shrink | contracts also in a length direction, there exists an effect | action of the press roll part 14 about this, and the shrinkage amount is less than the width direction.

  Accordingly, it is preferable to use the sheet S1, S2 having the property that the two sets of electrode wires L1, L2 follow and contract with respect to the contraction in the width direction and the length direction. When a non-electrode wire is used, undulations occur at both side edges of the conductive plastic sheet S3, resulting in a state like a comb. These corrections can be difficult and require caution.

  Here, various types of thermoplastic plastic can be used as a raw material for the conductive plastic sheet. Among them, polypropylene, heat-resistant polyethylene, polybutene, and the like are preferable.

  The thermoplastic is made of pellets by adding about 15 to 30% of fine conductive carbon, for example, furnace black. In a mixer (not shown), the pellets are uniformly mixed under heating, then supplied to an extruder, and heated to a melting temperature of about 200 ° C. to melt. And as shown in FIG. 11, it flows in into the flow path 2c through the connection metal fitting 2 of the electroconductive plastic sheet manufacturing apparatus 1 of this invention from the nozzle part of an extruder. Next, the flow is divided into the branch paths 2e and 2f from the flow path 2d of the flow dividing metal 3, flows into the runner grooves 2g and 2h of the sheet forming metal 4, and the pressure is equalized at this portion.

  Then, the molten plastic pressure-equalized via the runner grooves 2g and 2h flows into the slit portions 2i and 2j formed on both surfaces of the cored bar 10, where it is widened in a sheet shape. Flow down. Meanwhile, the molten plastic is further pressure-equalized by the second runner grooves 2m and 2n provided in two stages in the slit portions 2i and 2j. Then, two conductive plastic sheets S1 and S2 are continuously discharged from the slits formed by the caps 5a and 5b and the cored bar 10 arranged at the lower end of the sheet molding metal 4.

  On the other hand, it consists of two sets of guide holes 11a and 11b provided in the shunt fitting 3 and the sheet forming fitting 4, and two sets of braided wires through two sets of guide pipes 12a and 12b provided in the sheet forming fitting 4. The electrode wires L1 and L2 are sent to both side portions and the central portion between the conductive plastic sheets S1 and S2 immediately after molding, and then discharged from the caps 5a and 5b by the press rolls 14a and 14b of the press roll portion 14. It is pressed while in the softened state, and is integrated with the two sets of electrode wires L1 and L2 being sandwiched therebetween to form one conductive plastic sheet S3.

  The conductive plastic sheet S3 thus molded is particularly suitable for a planar heating element used for floor heating or the like, and the one sent out from the pressing roll part 14 is as shown in FIG. The sheet is cut into two sheets by a plurality of (three in the figure) cutters 23 rotating at high speed. Here, as the cutter, a fixed cutter attached to a support body (not shown) can be used.

  Accordingly, two conductive plastic sheets S3 'having a predetermined sheet width can be taken. At that time, the ear S4 is also cut at the same time. Thereafter, each conductive plastic sheet S3 'is cut into a predetermined length. Then, after covering the whole with a covering cover made of a heat-resistant insulating sheet such as a thick polyester film or polyethylene sheet, the sheet covering cover is degassed and sealed in a watertight manner to provide a strong planar heating element. Form. Then, lead wires are connected to the electrode wires L1 and L2 drawn from both edges of the conductive plastic sheet S3 ', and a waterproof connector that can be easily wired according to the application is fixed.

  The final conductive plastic sheet S3 'manufactured according to the present invention has a width of 200 to 260 mm and a thickness of 0.8 to 1.5 mm. Further, the length is usually about 2500 mm for convenience of use and laying work.

  In this case, the power consumption is about 100 to 250 W per sheet, and this power consumption has a characteristic that it flows at the maximum at the time of current inrush, gradually decreases with increasing temperature, and stabilizes at a predetermined temperature.

  In addition, if wiring that can be easily connected to a connector, etc. is used, it is possible for anyone other than an electrician to perform the work, and it is necessary to perform multiple tasks with different time differences as in conventional floor heating work. There is also an effect on the construction such as no longer.

  The technical idea of the present invention is described in the following embodiments, but the present invention is not limited to this, and can be modified within the scope of the technical idea described in the present specification and drawings. It is something that can be done.

1 is a cross-sectional view of a double-type conductive plastic sheet manufacturing apparatus of the present invention. It is BB sectional drawing of FIG. It is an end view of the metal fitting containing the partial cross section of the said conductive plastic sheet manufacturing apparatus. It is AA sectional drawing of FIG. It is a perspective view of a molten plastic flow path. It is operation | movement explanatory drawing of the said conductive plastic sheet manufacturing apparatus. 1 is a cross-sectional view of a two-sheet type conductive plastic sheet manufacturing apparatus of the present invention. It is CC sectional drawing of FIG. It is a principal part expanded sectional view of FIG. It is an end view of the metal fitting containing the partial cross section of the said conductive plastic sheet manufacturing apparatus. It is operation | movement explanatory drawing of the said conductive plastic sheet manufacturing apparatus. It is explanatory drawing which cuts a conductive plastic sheet.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Conductive plastic sheet manufacturing apparatus 2 Connection metal fitting 2a Flange part 2b Connection part 2c, 2d, 2e, 2f Flow path 2g, 2h Runner groove 2i, 2j Slit part 3 Shunt device 4 Sheet molding metal fitting 4a, 4b Metal fitting 5a, 5b Cap 6a, 6b Flow rate adjusting valve 7a, 7b Throttle valve 10 Core metal 11a, 11b Guide hole 12a, 12b Guide pipe
17 Cooling device

Claims (5)

Conductive molten plastic is introduced into a plurality of branch paths branched from the main flow path, and extruded from a base having two parallel slits to form two sheets, and between the two molded sheets. In a conductive plastic sheet manufacturing apparatus for manufacturing a single conductive plastic sheet in which a plurality of electrode wires are introduced and the molded sheet is pressed and bonded to hold the electrode wires, the die is connected to a single metal plate. A conductive plastic sheet manufacturing apparatus characterized in that a plurality of units are arranged in a mold apparatus, and a flow rate adjusting portion is provided in the branch passage communicating with the die to adjust the flow rate of conductive molten plastic for each unit. The conductive property according to claim 1, wherein a plurality of pressing roll portions corresponding to the base are provided on the downstream side of the mold apparatus, and the plurality of pressing roll portions are operated at the same or different speeds. Plastic sheet manufacturing equipment. 2. The conductive plastic sheet manufacturing apparatus according to claim 1, wherein the temperature of the mold apparatus is adjusted for each unit. 2. The conductive plastic sheet manufacturing method according to claim 1, wherein a fan-shaped runner groove opened in the width direction of the base is provided in the branch path so as to relieve the pressure of the molten plastic for each unit. apparatus. A connection fitting connected to the extruder, a diversion fitting having a plurality of branch paths, a mold device formed by a molding fitting for molding molten plastic into a sheet, and a pressing roll provided on the downstream side of the mold device And the molded metal fitting is formed of a metal core and metal fittings arranged on both sides thereof, and a runner groove, a throttle valve, and a slit part on the mating surface of the metal core and the metal fitting, In the conductive plastic sheet manufacturing apparatus provided with a base, and further provided with a guide hole for guiding the electrode wire to the core metal,
The runner groove is formed in an inverted V shape, and is formed by a front part connected to the branch path and a rear part connected to the front part, and the thickness of the front part approaches the rear part. And the latter part maintains the same thickness,
A second runner formed in the slit portion, which has a gently curved central portion and two extending portions extending from both end portions toward the oblique wake side, and is formed in an inverted V shape as a whole. Provide one or more grooves,
The conductive plastic sheet manufacturing apparatus further comprising a plurality of guide holes for guiding the electrode wires in the core metal, and a plurality of cutters provided at a predetermined interval on the downstream side of the pressing roll portion. .

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