JP4912415B2 - Laminated tube manufacturing apparatus and method - Google Patents

Description

  The present invention relates to a laminated tube manufacturing apparatus and method for manufacturing a multiple laminated tube made of a composite synthetic resin material, and in particular, a laminated tube with improved internal pressure strength and external pressure strength and excellent airtightness. The present invention relates to an apparatus and method for manufacturing a laminated tube that can be manufactured.

  FIGS. 1 and 2 are figures disclosed in Patent Document 1, and this published invention has “triple tube, triple tube manufacturing apparatus and method” posted therein.

  The main contents of the invention of the announcement will be described with reference to the drawings as follows.

  The triple tube 1 shown in FIG. 1 is extruded in a strip shape and wound so that one side overlaps, and the one side overlaps with the inner skin 2, and the overlapped portion is pressure-bonded. The intermediate layer 3 and an outer skin 4 wound on the intermediate layer 3 so that one side thereof is overlapped, and the overlapped portion is crimped, and the inner skin 2, the intermediate layer 3, and the outer skin 4 are heat-sealed. It is a structure formed by

  Here, PE is used for the outer skin 4 and the inner skin 2, and a recycled material is used for the intermediate layer 3.

  A method for manufacturing such a triple pipe according to the invention of the announcement will be described with reference to FIG.

  The endothelium 2 extruded in a band from one nozzle (not shown) is wound on the upper surface of a roller (not shown) of the winder, and at this time, one side portions are mutually connected as shown in FIG. Overlapping is wound.

  When the inner skin 2 is wound on the upper surface of the winder, the intermediate layer 3 extruded in a strip shape from another nozzle is wound on the upper surface as shown in FIG. When the intermediate layer 3 is discharged from the nozzle 13 and wound around the upper surface of the inner skin 2, the inner skin 2, the intermediate layer 3, and the intermediate layer 3 are heat-sealed and cooled by sprinkling water from a cooling device.

  At this time, the overlapping portion of the intermediate layer 3 and the overlapping portion of the endothelium 2 are arranged to be difficult to be different from each other.

  When the winding of the intermediate layer 3 is completed, the overlapping portion of the intermediate layer 3 is pressure-bonded inside using a roller 30 as shown in FIG. The outside of the intermediate layer 3 is flattened to some extent.

  When the press of the roller 30 to the intermediate layer 3 is completed, the outer skin 4 extruded from another nozzle in a band shape is wound around the upper surface of the intermediate layer 3 so that one side thereof is overlapped with each other. Also at this time, the overlapping portion of the outer skin 4 is wound as shown in FIG.

  Further, the outer skin 4 discharged from another nozzle is heat-sealed while being wound around the outer side of the intermediate layer 3 which has not been cooled, and is cooled by a cooling device.

  When the winding of the outer skin 4 is completed, the roller 31 is brought into contact with the overlapping portion of the outer skin 4 and crimped as shown in FIG. 2D, so that the final cross-sectional shape of the triple tube 1 is as shown in FIG. In this way, final cooling is performed.

The triple tube 1 manufactured by the above method is manufactured long while passing through the auxiliary work table of the winder, and the triple tube manufactured in this way is cut into a desired length before shipment.

  However, the triple tube posted in the above-mentioned publication invention is not formed sufficiently with a strong external impact because each layer is formed by only overlapping each other when it is wound, There is a problem that there is a limit to improving the internal pressure strength and the tensile strength.

  In particular, in the above triple tube, when adjacent layers are formed of different materials, the coupling rigidity of each other becomes fragile. Therefore, when a thermal shock is applied from inside and outside, the layers formed of different materials are mutually connected. There is a problem that the strength of the laminated tube may be significantly reduced due to separation or cracking.

  Furthermore, since the above-mentioned publication invention is formed in a structure in which each layer is wound in almost one row and overlaps only a part thereof, the thickness of any one layer, for example, the intermediate layer 3 is increased to a considerable extent. In order to form the intermediate layer 3 with a predetermined thickness or more as described in the invention, there is a problem that one layer should be wound while being separated and discharged in double or triple. There was also a point.

In addition, the conventional laminated pipe manufacturing apparatus and method including the above-mentioned publication invention is difficult to continuously supply the composite waste plastic material at an appropriate film thickness continuously, and it is difficult to adjust the film thickness of the intermediate layer or the molten state. Since adjustment is not easy, there is a problem that productivity is lowered and quality of the laminated tube is also lowered.
Republic of Korea Patent No. 10-0290302

  The present invention has been made in view of such problems, and is a laminate that improves the durability and reliability of a tube by being excellent in internal pressure strength and external pressure strength and having sufficient rigidity against thermal shock. It is an object of the present invention to provide a laminated tube manufacturing apparatus and method for manufacturing a tube.

  And, the present invention is such that the inner layer material and the outer layer sheet are supplied by an extrusion method, and the intermediate layer is supplied by a pulling method using a roller, so that the intermediate layer material constituted by the recycled material does not cease. An object of the present invention is to provide a laminated tube manufacturing apparatus and a method thereof that can be smoothly supplied, can easily adjust the film thickness of the intermediate layer material and the melted state, can be easily manufactured, and can contribute to improving the quality of the tube. And

  Further, in the present invention, when forming a laminated tube, after cooling water is supplied to the already laminated sheets and cooled to some extent, the compressed air is sprayed thereon to remove moisture, and a new sheet is laminated. By providing such a structure, a laminated tube manufacturing apparatus and method for increasing the strength and density of a completed tube by increasing the bonding force between the respective layers and manufacturing a laminated tube of higher quality can be provided. With the goal.

  In order to achieve the above object, a laminated tube manufacturing apparatus according to the present invention includes a winding machine having a cylindrical structure and driving means for rotationally driving the winding machine; and a resin for forming an inner layer and an outer layer of the laminated pipe on the winding machine. An inner layer extruder and an outer layer extruder for extruding a material into a sheet; an intermediate feeding machine for drawing a molten material into a sheet structure using a pair of drawing rollers to form an intermediate layer; A pressure roller that is positioned on a side surface and presses and presses sheets stacked in a multilayer structure on the winder.

  At this time, the laminated tube manufacturing apparatus further includes a cooling water injection mechanism that is arranged around the winding machine and jets cooling water when each resin material sheet is wound around the winding machine. It is preferred that

  The laminated tube manufacturing apparatus further includes a moisture removing mechanism that is located on the back side of the cooling water injection mechanism in the rotation direction of the winder and removes moisture existing on the surface of the wound portion. Preferably, it is configured.

  Here, the moisture removal mechanism preferably has a structure capable of injecting compressed air.

  And the said cooling water injection mechanism is arrange | positioned so that a cooling water can be injected to the resin material wound from the lower part side of the said winder, The said water removal mechanism is from the upper side of the said winder. It is preferable that the compressed resin material be jetted onto the wound resin material.

  At this time, the moisture removal mechanism can be configured to inject compressed air from a direction inclined with respect to the surface of the wound resin material.

  The intermediate charging machine includes a charging rod in which a molten material for forming an intermediate layer is stored, and a pair of drawers that are positioned below the charging rod and that draws the molten material while being rotated by driving means. It is preferable to include a roller and an interval adjusting device that can adjust the interval between the pair of drawing rollers.

  The drawing roller is preferably configured to allow cooling water to pass through so as to cool the molten material drawn into the drawing roller.

  In addition, in order to achieve the above problems, the laminated tube manufacturing method according to the present invention collects a plurality of waste plastics and removes non-plastic components such as paper, metal, glass and cloth, and selects only pure plastic components. A waste plastic sorting step; a composite waste plastic grinding step for grinding the plastic selected in the waste plastic sorting process to a predetermined size or less; and the above-mentioned ground composite plastic waste is put into a twin screw melter and heated. In addition, a melting and mixing stage in which the mixture is melted to a certain state at a constant temperature and mixed; the composite waste plastic that has passed through the melting and mixing stage is made to have a predetermined film thickness and width by an intermediate layer feeding machine using a pair of drawing rollers. An intermediate layer sheet forming step to be formed and pulled out into a sheet having; an inner layer together with the sheet forming the intermediate layer Formation of a laminated tube in which a cylindrical tube is formed by continuously winding a resin material sheet for forming an inner layer and an outer layer of a laminated tube using an unwinder and an outer layer extruder in a spiral manner from an extrusion winder A step of cooling the laminated tube formed in the above-mentioned step by injecting cooling water and cooling it, cutting the laminated tube to a desired length and completing the laminated tube; To do.

  In the melting and mixing step, the pulverized composite waste plastic is melted and mixed through the primary, secondary, and tertiary processes, but the heating temperature in the primary melting process is 240 ° C. to 280 ° C. The heating temperature in the next process is preferably set to 180 ° C. to 220 ° C., which is lower than the temperature in the primary melting process.

  Further, in the intermediate layer sheet forming step, it is preferable that the sheet is supplied by a method in which the intermediate layer sheet drawn through the two drawing rollers is naturally dropped from the top to the bottom.

  In the laminated tube forming step, when the sheets forming the respective layers are wound, it is preferable that the cooling water is directly jetted between the layers or the surface of each layer to instantaneously cool them. At this time, the instantaneous cooling temperature can be set to 100 ° C. to 150 ° C.

  When the cooling water is injected and cooled, it is preferable to remove moisture by concentrated injection of compressed air immediately before a new layer is wound around the surface of each cooled layer.

  In addition, in the method for manufacturing a laminated tube according to the present invention, the resin material sheet for forming the inner layer and the outer layer of the laminated tube is supplied to the winder together with the sheet that forms the intermediate layer of the laminated tube. However, although it is continuously wound in a spiral manner and formed into a cylindrical tube to form a laminated tube, when a sheet forming each layer is wound, between the layers or on the surface of each layer It is characterized in that after cooling water is directly injected and instantaneous cooling is performed, moisture is removed by concentrated injection of compressed air immediately before a new layer is wound around the surface of the cooled layer.

  The laminated pipe manufacturing apparatus and method according to the present invention produce a laminated pipe that is excellent in internal pressure strength and external pressure strength and has sufficient rigidity against thermal shock so that the durability and reliability of the pipe can be improved. There are advantages that can be done.

  In particular, according to the present invention, the inner layer and outer layer sheets are supplied by an extrusion method, and the intermediate layer is supplied by a drawing method using a roller to manufacture a laminated tube. In this process, the laminated tube can be easily manufactured, and the thickness and melted state of the material can be easily adjusted using two rollers in the supply process of the intermediate layer. There is an advantage that a laminated tube can be produced effectively.

  Further, according to the present invention, when a laminated tube is formed, after cooling water is supplied to the laminated sheets and cooled to some extent, the compressed air is injected to remove moisture, and a new sheet is laminated thereon. Therefore, it is possible to increase the strength and density of the laminated tube by increasing the bonding force between the laminated layers, and there is an advantage that it is possible to contribute to the improvement of the quality of the tube as a whole.

  In the laminated tube manufacturing apparatus according to the present invention, a winder having a cylindrical structure and a driving means for rotationally driving the winder; and a resin material in sheet form for forming the inner layer and the outer layer of the laminated tube on the winder An inner layer extruder and an outer layer extruder for extruding into an intermediate layer; an intermediate feeder for drawing a molten material into a sheet structure using a pair of draw rollers to form an intermediate layer; located on the side of the winder A pressure roller that presses and presses sheets stacked in a multilayer structure on the winder.

  In the method for manufacturing a laminated tube according to the present invention, a waste plastic sorting step of collecting a plurality of waste plastics and removing non-plastic components such as paper, metal, glass, cloth, etc., and sorting only pure plastic components. And crushing a composite waste plastic that crushes the plastic selected in the waste plastic sorting process to a predetermined size or less; and putting the crushed composite waste plastic into a twin screw melter and applying heat at a constant temperature. A melting and mixing stage for mixing while melting to a certain state; a composite waste plastic that has passed through the melting and mixing stage is formed into a sheet having a predetermined film thickness and width by an intermediate layer feeding machine using a pair of pull-out rollers An intermediate sheet forming step to form and pull out; an inner layer extruder with the sheet forming the intermediate layer; and A laminated tube forming step of forming a cylindrical tube by continuously winding a resin material sheet for forming an inner layer and an outer layer of a laminated tube using a layer extruder in a spiral manner from an extrusion winder; and Cooling water is sprayed onto the laminated tube formed in the stage to cool the laminated tube, and the laminated tube is cut to a desired length, and the laminated tube is cooled and completed.

  Moreover, in the manufacturing method of the laminated tube which concerns on this invention, while supplying the resin material sheet | seat for forming the inner layer and outer layer of a laminated tube with the sheet | seat which forms the intermediate | middle layer of a laminated tube to a winding machine, it is a spiral system. Although it is continuously wound and formed into a cylindrical tube to form a laminated tube, when sheets forming each layer are wound, cooling water is directly sprayed between the layers or on the surface of each layer. After the instantaneous cooling, it is configured to remove moisture by concentrated injection of compressed air immediately before a new layer is wound around the surface of the cooled layer.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

  In the embodiments of the present invention, an apparatus and a method for manufacturing a triple tube will be mainly described. However, the present invention is not limited to this, and depending on the implementation conditions, a multiple tube including a double tube or a quadruple tube is manufactured. It can also be applied to.

  FIG. 3 is a partially cutaway view showing a laminated tube according to an embodiment of the present invention and an enlarged view of a main part of a notched portion, and FIG. 4 is a cross-sectional view taken along the line AA of FIG. It is.

  As shown in the drawing, a laminated tube 50 according to an embodiment of the present invention is configured by mutually laminating three layers of an inner layer 51, an intermediate layer 52, and an outer layer 53, and each layer 51, 52, 53 is formed. The material to be made is preferably made of a synthetic resin material such as PE.

  Here, the intermediate layer 52 is preferably configured by melting a recycled material using a composite waste plastic raw material. A more detailed raw material ratio of the intermediate layer will be described later.

  Each of the layers 51, 52, and 53 is formed by melting a synthetic resin material or the like, wound into a spiral structure while being extruded into a long sheet shape having a predetermined width, and being mutually fused and cured.

  In particular, in the present invention, when the sheet shape is wound to form each layer, one end of the sheet for forming a certain layer is formed on the inner layer or on the outer side. When the layer to be wound is wound, it is formed by being wound between the wound portions.

  That is, referring to FIG. 3, the outer layer 53 is formed with a portion 53a sandwiched between intermediate layers 52, and the inner layer 51 is formed with a portion 51a sandwiched between intermediate layers 52. .

  In one embodiment of the present invention, a configuration in which all of the three layers 51, 52, and 53 are sandwiched and coupled to each other is illustrated, but depending on the implementation conditions, only the outer layer 53 may be sandwiched between the intermediate layers 52, or It can also be configured such that only the intermediate layer 52 is sandwiched between the inner layers 51.

  The three layers 51, 52, and 53 are configured to form one layer while being wound in a state where the winding portions forming the respective layers overlap each other.

  As described above, when the three layers 51, 52, and 53 are wound while overlapping each other and sandwiched between other adjacent layers to form a laminated tube, each layer 51, The bond strength between 52 and 53 is greatly increased, the compressive strength and the tensile strength are improved, and at the same time, the durability against an external thermal shock is also increased.

  Further, in the present invention, when a relatively thick layer is wound among the three layers 51, 52, 53, the layers are wound so as to overlap each other in a direction inclined with respect to the longitudinal direction of the tube. It is preferable to form. In the present embodiment, a structure in which the intermediate layer 52 is wound so as to overlap each other in a direction inclined with respect to the longitudinal direction of the pipe is illustrated.

  With reference to FIG. 5 and FIG. 6, a detailed description will be given of the laminated structure of the laminated tube according to the present invention configured as described above.

  FIG. 5 is a view showing a winding state when a laminated tube of one embodiment is manufactured using the laminated tube manufacturing apparatus according to the present invention, and FIG. 6 is a diagram of the embodiment according to the present invention. It is detailed sectional drawing which showed the winding part at the time of manufacturing a laminated tube.

  As shown in the drawing, the laminated tube 50 of the present invention is configured such that each sheet 51P, 52P, 53P forming each layer 51, 52, 53 extruded from an extruder and a charging machine described later is wound around a winder 60. It is formed by laminating and heat-sealing and then cooling and curing.

  Here, as described above, the laminated tube 50 of the present invention is in a state in which a part of the outer layer 53 is sandwiched between the intermediate layers 52 and the intermediate layer 52 is sandwiched between the inner layers 51 (in the form after lamination, the inner layer is the intermediate layer). Sheet 52P in which one side end portion 53a (the left side portion in the drawing) forming the outer layer 53 forms the intermediate layer 52 as shown in FIG. The one end 52a of the sheet 52P forming the intermediate layer 52 is arranged to be positioned below the sheet 51P forming the inner layer 51.

  At this time, it is sufficient that the width of the outer layer and the inner layer sheets 53P and 51P overlapping the intermediate layer sheet 52P is a width that is sandwiched between the overlapping portions of the sheets 52P forming the intermediate layer. It is preferable that the width of the portion not sandwiched between the inner sheets 53P and 51P is formed to have a size that overlaps the own sheet wound before that.

  FIG. 6 shows in detail the structure laminated in this manner. As shown in FIG. 5, the sheets 51P, 52P, 53P forming the inner layer 51, the intermediate layer 52, and the outer layer 53 are partially overlapped with each other. When wound on the winder 60, a part of the sheet of the outer layer 53 is inserted between the sheets of the intermediate layer 52 wound with an inclination with respect to the longitudinal direction of the tube as in FIG. The sheet that is wound in a state and forms the intermediate layer 52 also has a multilayer structure while being wound while being inserted between the sheets that form the inner layer 51.

  After being wound up to the outer layer 53 in this way, when the outer layer 53 is pressed by pressing with the pressure roller 65, the uncured molten layers 51, 52, 53 are pressure-bonded while being mutually heat-sealed. Thus, a laminated tube having a multilayer structure is formed.

  Further, since the intermediate layer 52 is wound while being overlapped in an inclined direction, the intermediate layer 52 can be formed to be considerably thicker than the inner layer 51 and the outer layer 53.

  Next, a laminated tube manufacturing apparatus for manufacturing the laminated tube of the present invention as described above will be described.

  FIG. 7 is a side configuration diagram showing the laminated tube manufacturing apparatus according to the present invention, FIG. 8 is a front configuration diagram showing the laminated tube manufacturing apparatus according to the present invention, and FIG. It is the figure which showed the intermediate | middle throwing machine seen from the line direction.

  In the laminated tube manufacturing apparatus according to the present invention, as shown in FIGS. 7 and 8, a winder 60 in which a plurality of winding rollers 61 are arranged in a cylindrical structure, and the winder 60 is rotationally driven. A winding motor 63 for driving means, an inner layer extruder 71 and an outer layer extruder 73 for extruding a resin material for forming the inner layer 51 and the outer layer 53 into the sheet shape in the winder 60, and an intermediate layer 52 are formed. An intermediate feeding machine 72 for feeding a molten sheet, a pressure roller 65 that is positioned on a side surface of the winder 60 and presses and presses the sheets stacked in a multilayer structure on the winder 60; A cooling water injection mechanism 67 that is arranged around the winder 60 and injects cooling water when the respective resin material sheets are wound around the winder, and the cooling water from the rotation direction of the winder 60. The moisture removal mechanism 68 for removing moisture which is located behind the morphism mechanism 67 present on the surface of the wound portion, and is configured with a.

  Here, the intermediate feeding machine 72, the inner layer extruder 71 and the outer layer extruder 73 are wound in the state where the sheets 51P, 52P and 53P for forming the respective layers 51, 52 and 53 overlap each other as described above. It is arranged to be wound around the take-up machine 60.

  For reference, in FIG. 7 and FIG. 8, the inner layer extruder 71 and the outer layer extruder 73 are shown only on a table on which a slot is formed so that the molten resin material is extruded. It is also possible to connect with a device for supplying a resin material, and the positions are also extruded so that each layer 51, 52, 53 is sandwiched between adjacent layers as described above. If the structure can be used, the position can be variously changed according to the implementation conditions.

  In FIG. 7, the base of the inner layer extruder 71 is positioned below the outer layer extruder 73, but this is an arrangement according to one embodiment, and in addition, the base of the inner layer extruder 71 is placed in the middle. A configuration in which the machine 72 is arranged on the left side of the machine 72 is also possible.

  On the other hand, as shown in FIG. 10, when each layer 51, 52, 53 is laminated, it is possible to manufacture a laminated tube with a structure that is not sandwiched between adjacent layers. The positions of the extruders 71 and 73 and the intermediate charging machine 72 can be provided.

  Next, the configuration of the intermediate charging machine 72 will be described in detail.

The intermediate charging device 72 includes a charging passage 72A for storing a molten material.
A pair of pull-out rollers 72B driven by a motor 72C for discharging the molten material are formed below A 1.

  This will be described in detail with reference to FIG. 9. Two drawing rollers 72B whose intervals are adjusted by the interval adjusting device 85 are arranged side by side, and these two drawing rollers 72B are rotated and driven by a motor 72C. The sheet 52P for forming the sheet is discharged.

  Here, the distance adjusting device 85 can adjust the film thickness of the sheet 52P of the intermediate layer discharged from between the two drawing rollers 72B by adjusting the distance between the two drawing rollers 72B. Reference numeral 86 denotes a film thickness adjusting handle for adjusting the interval of the interval adjusting device 85.

  The interval adjusting device 85 can be configured to adjust the interval between the two rollers 72B by changing the position of a shaft support structure 90 such as a bearing 89 that supports the two rollers 72B.

  That is, the two rollers 72 </ b> B rotate around the respective shafts 88, but these shafts 88 are supported by the shaft support structure 90 via the bearings 89. Accordingly, the distance adjusting device 85 can adjust the distance between the two rollers 72B by adjusting the distance between the shaft support structures 90 that support the bearing 89, and the film thickness adjusting handle. 86 is connected to the shaft support structure 90 by a screw connection of a turnbuckle system or the like, and can be configured to adjust the distance between the two rollers 72B.

  Also, the two drawing rollers 72B are configured such that cooling water passes through them, and this is when the molten material for forming the intermediate layer 52 is drawn while passing between the two rollers 72B. It is configured to be continuously drawn out in a shape having a predetermined film thickness in a slightly hardened state, that is, in a state of being properly cured and melted. Therefore, the two drawing rollers 72B are formed in a cylindrical structure so that cooling water can pass through them, and the cooling water inlet 81 is located on one side and the cooling water outlet 83 is located on the other side. .

  At this time, it is preferable that the cooling water inlet 81 and the cooling water outlet 83 on both sides are coupled to the shaft 88 of the drawing roller 72B. In this case, the cooling water inlet having a tubular structure is used. It is preferable that the opening 81 and the cooling water discharge opening 83 are inserted into the shaft 88 of the drawing roller 72B of the rotating body.

  Of course, it is preferable that a normal sealing member for preventing leakage of the cooling water is provided between the tube forming the cooling water inlet 81 and the cooling water outlet 83 and the shaft 88 of the roller.

  On the other hand, when the intermediate layer 52 is manufactured using a general molten resin instead of a recycled material using composite waste plastic, the intermediate layer extruder 71 is not used without using the intermediate charging machine 72 configured as described above. It is also possible to produce a laminated tube using an extruder similar to or similar to the outer layer extruder 73.

  Next, the cooling water injection mechanism 67 and the water removal mechanism 68 will be described.

  As shown in FIGS. 5 and 7, the cooling water injection mechanism 67 is wound from the lower side of the winder 60 in which one or a plurality of (preferably 3 to 5) nozzles are arranged. It arrange | positions so that cooling water can be sprayed on the resin material.

  At this time, it is preferable that the cooling water injection mechanism 67 is disposed at the lower part of both side surfaces of the winder 60.

  The moisture removing mechanism 68 preferably has a nozzle structure capable of jetting compressed air. The cooling water jetting mechanism 67 is positioned on the lower side of the winder 60, whereas the moisture removing mechanism 68 has the winding function. It arrange | positions so that compressed air can be injected to the resin material wound from the upper part side of the taking machine 60. FIG.

  Further, as shown in FIG. 5, the moisture removing mechanism 68 is inclined with respect to the surface of the wound resin material so that moisture remaining on the surface of the resin material, that is, moisture can be more easily removed. It is preferable that it is comprised so that compressed air may be injected from.

  On the other hand, the laminated tube manufacturing apparatus according to the present invention is configured to include a cooling device for completely curing the laminated tube wound around the winder 60 and having a completed shape. The cooling water can be sprayed onto the laminated tube 50 from the inside or outside of the winder 60. Since the configuration of such a cooling device is a known configuration, detailed description thereof is omitted here.

  The manufacturing process of the laminated tube according to the embodiment of the present invention will be briefly described using the laminated tube manufacturing apparatus according to the present invention as described above.

  As shown in FIG. 8, when the winding motor 63 is rotated, the winder 60 is rotated, and in this state, the inner layer extruder 71, the outer layer extruder 73, and the intermediate layer feeder 72 are operated, and each layer is operated. The sheets 51P, 52P and 53P for forming the sheet are discharged.

  Then, the sheets 51P, 52P, 53P discharged in this way are stacked while being wound around the rotating winder 60, and at this time, a part of the sheet 53P forming the outer layer as shown in FIG. Is overlapped with a part of the sheet 52P forming the intermediate layer, and at the same time, a part of the sheet 52P forming the intermediate layer is overlapped with a part of the sheet 51P forming the inner layer and is wound on the winder 60.

  In FIG. 6, the dotted line portion shows a state immediately before being wound around the winder 60, and the solid line portion shows a state where the roller is wound around the winder 60 and then fused to each other by the pressure of the pressure roller 65. .

  When the respective layers 51, 52, 53 are laminated in this manner, the inner layer 51 and a part of the outer layer 53 are laminated with the intermediate layer 52 sandwiched between them as shown in FIGS. It is formed.

  Next, when cooling water is injected from the inside or outside of the pipes laminated as described above using a cooling device (not shown), a triple laminated pipe is formed while the laminated parts thermally bonded to each other are cured. It becomes like this.

  The manufacturing method of the laminated tube according to the present invention including the laminated tube of the above-described embodiment will be specifically described as follows.

  The laminated tube manufacturing method according to the present invention will be described mainly with respect to the case where the intermediate layer 52P of the laminated tube 50 is manufactured from a composite synthetic resin, that is, a composite waste plastic.

  In the method for manufacturing a laminated tube according to the present invention, one or more types of waste plastics are collected to remove non-plastic components such as paper, metal, glass and cloth, and only the pure plastic components are sorted. And crushing the composite waste plastic to pulverize the plastic selected in the waste plastic sorting process to a predetermined size or less; and introducing the pulverized composite waste plastic into a twin screw melter and applying heat to the predetermined temperature. A melting and mixing stage for mixing while being melted to a certain state; a sheet having a constant film thickness and width through the composite waste plastic passed through the melting and mixing stage through an intermediate layer feeding machine 72 using a pair of drawing rollers 72B Forming an intermediate layer sheet and drawing it out; and an inner layer together with the sheet forming the intermediate layer 52 A cylindrical tube is formed by extruding a resin material sheet for forming the inner layer 51 and the outer layer 53 of the laminated tube using the unwinder 71 and the outer layer extruder 73 and continuously winding the resin material sheet from the winder 60 by a spiral method. A laminated tube forming step of forming a shape; a laminated tube cooling and completion step in which cooling water is sprayed onto the laminated tube formed in the above step to cool it, and the laminated tube is cut to a desired length and completed. Do it sequentially.

  Each stage of the manufacturing method of the above laminated tube will be described in detail.

  First, the composite waste plastic sorting step collects various types of waste plastics, removes non-plastic components such as paper, metal, glass and cloth, and sorts only pure plastic components. This is because if a composite waste plastic material is mixed with a foreign substance such as a metal component, the laminated tube cannot be molded or the quality is deteriorated.

  Here, before the composite waste plastic is pulverized, the ratio of the types of plastic must be constant. This is because when a laminated tube is manufactured using the above-mentioned intermediate layer charging machine 72, a certain degree of tensile force and stress are necessary to form into a sheet shape and into a tube shape. Formulation becomes important.

  A preferable raw material ratio of the composite waste plastic will be described as follows.

  PE material 50% or more, PP material 10% or less, PET material 10% or less, PS material 10% or less, PA material 10% or less, other materials (PC, ABS, PMMA, PBT, etc.) 5% or less, but PVC It is preferable to form the film at a ratio of exclusion, organic matter (aluminum, soil, etc.) and reinforcing agent (less than 5% reinforcing agent).

  Of course, the ratio of such raw materials can be adjusted within an appropriate range depending on the working conditions. That is, it is possible to use only one waste plastic raw material, and it is also possible to use two or more types of waste plastic raw materials. However, the most preferable composition ratio is preferably the above-described composition ratio.

  Next, the pulverization step of the composite waste plastic is performed in a known pulverizer, and the various types of plastics are uniformly mixed while being pulverized to a predetermined size or less in the pulverizer. Since the raw material finely pulverized at this stage is easily melted even if a small heat source is used in the subsequent melting process, not only energy saving but also aging of the machine can be prevented.

  Next, the melting and mixing stage includes a primary melting and mixing process and a second and third melting and mixing process.

  In the primary melting and mixing process, the composite waste plastic pulverized in the pulverization step is charged into a twin screw melting machine and heated to melt to a certain state at a predetermined temperature. At this time, the pulverized composite waste plastic is uniformly mixed and melted.

  Here, the twin-screw melter is a known device that forcibly inputs and mixes composite waste plastic raw materials that are arranged side by side and are pulverized while rotating in opposite directions to each other. It is preferable to use a variable speed system in order to adjust the discharge amount.

  In addition, examples of the heat source provided to the twin screw melter include a burner that uses gas, light oil, electricity, and the like, and any of these may be selectively used according to the implementation conditions. At this time, the heating temperature of the twin screw melter is preferably maintained within a predetermined range, and the preferable heating temperature is between 240 ° C and 280 ° C.

  When the heating temperature exceeds 280 ° C, PE having a relatively low melting temperature burns or changes in physical properties in the composite waste plastic raw material, and when it is lower than 240 ° C, In particular, the molten state of PET or the like having a high melting temperature is deteriorated, pressure is generated, the discharge speed is slowed, and there is a problem that sheet molding or laminated tube molding becomes impossible.

  In the secondary and tertiary melting and mixing processes, the molten raw material discharged after the primary melting and mixing processes is supplied to the secondary or, if necessary, a tertiary melting machine to perform melting and mixing again.

  In such secondary, tertiary melting and mixing processes, the raw material that has passed through the primary melting process is formed into a finer and more dense structure, and different physical properties are mixed into a complete wall. This is to make the physical properties of the material constituting the layer 52 stronger and firmer.

  In addition, it is possible to increase the strength and density of the material by preventing the generation of pores (bubbles) inside the raw material by discharging moisture and gas in the secondary and tertiary melting and mixing processes. Contributes to improving the quality of laminated tubes.

  As the heat source used in the secondary and tertiary melting and mixing processes, the same burner as that used in the primary melting and mixing processes can be used.

  The heating temperature at this time is suitably between 180 ° C. and 220 ° C., which is lower than the temperature of the primary melting and mixing process, and the heating method is to heat the outside of the secondary and tertiary melting machines to adjust the screw temperature. The method is to maintain within a predetermined range.

  Here, the reason why the secondary and tertiary melting temperatures are made lower than the primary melting temperature is that the material constituting the intermediate layer 52 is in a melted state in the primary melting process. This is because, while maintaining the molten state, it is possible to prevent the physical properties of the raw material from being lowered or the curing and discharging speed from being slowed.

  The secondary and tertiary melting and mixing processes may be omitted depending on the conditions of implementation, but it is preferably performed after the primary melting and mixing process for quality improvement. You can also go through the mixing process.

  Next, in the intermediate layer sheet forming stage, when the raw material is supplied to the intermediate layer feeder 72, a sheet having a predetermined film thickness and width is passed through the intermediate layer feeder 72 as shown in FIG. While being formed, the sheet 52P constituting the intermediate layer is supplied.

  At this time, the film thickness and width of the sheet 52P forming the intermediate layer 52 vary depending on the diameter of the laminated tube, and preferably the film thickness is 4 mm to 10 mm and the width is about 100 mm to 500 mm. Such a film thickness and width are formed through the two drawing rollers 72B.

  The sheet 52P drawn by the drawing roller 72B flows and is supplied by a natural drop method from the top to the bottom, so that the sheet 52P is continuously supplied in the sheet supply process and contributes to productivity improvement.

  At this time, the temperature of about 10% to 20% is cooled by the ambient air while the sheet 52P forming the intermediate layer flows. This is possible only when the sheet has certain physical properties, that is, when a certain amount of tensile force, density and temperature are maintained. However, while the above-mentioned composite waste plastic sorting process, grinding process, melting and mixing process are performed. The foreign matter and bubbles are removed, and then the sheet 52P forming the intermediate layer is cut in the supply process by being cooled to some extent in the process of supplying through the intermediate layer charging machine 72, or the shape is irregular when forming the tube. It can solve the problem of becoming.

  Next, in the step of forming the laminated tube, as shown in FIGS. 7 and 8, each sheet supplied to the winder 60 by the intermediate layer feeder 72, the inner layer extruder 71 and the outer layer extruder 73 is used. 51P, 52P, and 53P are continuously wound by the spiral method from the winder 60 to form a cylindrical tube.

  At this time, the material extruded from the inner layer extruder 71 and the outer layer extruder 73 is preferably not a recycled material but a new PE material.

  The laminated tube produced through such a process is formed like the laminated tube described with reference to FIGS. 3 to 5, or the intermediate layer sheet 52P and the inner layer as shown in FIG. In addition, it is possible to produce a laminated tube in which the outer layer sheets 51P and 53P are not sandwiched between each other. That is, the structure of the laminated tube is composed of an intermediate layer 52, an inner layer 51, and an outer layer 53. The intermediate layer 52 is formed by winding a composite waste plastic sheet, usually in the shape of a superimposed structure of 3 to 6 layers. The inner layer 51 and the outer layer 53 are manufactured by superposing and joining the new material PE so as to be superposed on the first layer to the second layer, and joining to a structure superposed on the fourth layer to the eighth layer as a whole.

  Here, since the number of overlapping layers of the intermediate layer 52 increases as the width of the sheet increases, the number of layers of the intermediate layer 52 is increased by increasing the width of the sheet 52P when producing a relatively thick tube. Thick tubes can then be produced easily.

  Further, as described above, when the sheets as materials of the inner layer 51, the intermediate layer 52, and the outer layer 53 are wound while being stacked on each other, the interlayer coupling is perfected only when cooling is performed to some extent.

  Therefore, when the sheets forming the respective layers 51, 52 and 53 are wound, the cooling water is directly sprayed between the layers and on the surface of each layer by using the cooling water spray mechanism 67 to be 100 ° C. Instant cooling to ~ 150 ° C.

  Thereafter, immediately before a new layer is wound on the surface of each layer thus cooled, the moisture is removed by concentrated injection of compressed air using the moisture removing mechanism 68. This is because when a new layer is wound on the surface of the wound layer while cooling water is sprayed for instantaneous cooling, delamination may occur due to moisture. This is because the delamination phenomenon is prevented by removing moisture.

  Then, when the sheets of each layer are stacked, the pressure roller 65 is used to apply pressure so that the bonding between the layers is complete and press the sheets.

  Therefore, by cooling each layer heated by passing through the cooling water injection process within a predetermined temperature, it becomes easy to form the laminated tube, and the shape is excellent, and the production time can be greatly shortened. Further, the interlayer separation phenomenon can be prevented by removing moisture generated by the cooling water using compressed air. In particular, the residual heat (about 100 ° C. to 120 ° C.) remaining in each layer interacts with such cooling and moisture removal processes, so the interlayer adhesion becomes very firm, and the integral type is so indistinguishable between the layers. By having a structure, the overall rigidity increases, and it becomes possible to produce a laminated tube with excellent quality.

  Next, the step of directly cooling the laminated tube with the cooling water is a process of continuously cooling the formed tube by allowing the cooling water to flow into and out of the tube after forming the laminated tube. In this way, it is possible to increase the production amount by continuously cooling the laminated tube until it is formed to a predetermined length, and it is possible to prevent deformation and distortion that occur at the time of forming the laminated tube, and Can be smooth.

  Next, in the step of cutting and completing the laminated tube, the produced and cooled laminated tube is cut into a desired length to produce a finished product.

  The apparatus and method for manufacturing a laminated pipe according to the present invention as described above have the effect that the durability and reliability of the pipe can be improved by being excellent in internal pressure strength and external pressure strength and having sufficient rigidity against thermal shock. There is.

  In particular, in the present invention, the inner layer and outer layer sheets are supplied by an extrusion method, and the intermediate layer is supplied by a drawing method using a roller to produce a laminated tube. Can be supplied continuously and smoothly, which makes it easy to manufacture laminated pipes, and it is possible to easily adjust the film thickness and molten state of the material using two rollers in the intermediate layer supply process. As a result, it is possible to effectively produce a laminated tube having a desired size.

  Further, in the present invention, when forming a laminated tube, cooling water is supplied to the laminated sheets and cooled to a certain extent, and then compressed air is injected to remove moisture, and a new sheet is laminated thereon. Therefore, there is an effect that it is possible to increase the strength and density of the laminated tube by increasing the bonding force between the mutually laminated layers, and to contribute to the improvement of the quality of the tube as a whole.

It is the figure by which the conventional laminated tube was shown. It is the figure by which the manufacturing method of the conventional laminated tube was shown. It is the figure by which the laminated pipe which concerns on one Example of this invention was shown, and its principal part enlarged view. It is sectional drawing from the AA line direction of FIG. It is the figure which showed the winding state when manufacturing a laminated tube using the manufacturing apparatus of the laminated tube which concerns on this invention. FIG. 6 is a detailed cross-sectional view showing a winding portion of the laminated tube as seen from the direction of the line B-B in FIG. 5. It is the side lineblock diagram showing the laminated tube manufacturing device concerning the present invention. It is the front lineblock diagram showing the laminated tube manufacturing device concerning the present invention. It is the figure which showed the intermediate | middle throwing machine seen from the CC line direction of FIG. It is detailed sectional drawing which showed the winding part of the laminated tube which concerns on the other Example of this invention.

Claims (13)

A winder having a cylindrical structure and drive means for rotationally driving the winder;
An inner layer extruder and an outer layer extruder for extruding a resin material into a sheet to form an inner layer and an outer layer of a laminated tube in the winder;
An intermediate charging machine that draws a molten material into a sheet structure using a pair of drawing rollers to form an intermediate layer;
A pressure roller that is positioned on a side surface of the winder and presses and presses a sheet laminated in a multilayer structure on the winder ;
Laminated tube manufacturing characterized by further comprising a cooling water injection mechanism arranged around the winding machine and for injecting cooling water when the respective resin material sheets are wound around the winding machine apparatus. The laminated tube manufacturing apparatus further includes a moisture removing mechanism that is positioned on the back side of the cooling water injection mechanism in the rotation direction of the winder and removes moisture existing on the surface of the wound portion. The laminated tube manufacturing apparatus according to claim 1, wherein: 3. The laminated tube manufacturing apparatus according to claim 2 , wherein the moisture removing mechanism has a structure capable of jetting compressed air. The cooling water injection mechanism is disposed so as to be able to inject cooling water onto the resin material wound from the lower side of the winder, and the moisture removing mechanism is wound from the upper side of the winder. The laminated pipe manufacturing apparatus according to claim 3, wherein the apparatus is configured so that compressed air can be sprayed onto the resin material. 5. The laminated tube manufacturing apparatus according to claim 4 , wherein the moisture removing mechanism is configured to inject compressed air from a direction inclined with respect to the surface of the wound resin material.   The intermediate charging machine includes a charging rod in which a molten material for forming an intermediate layer is stored, and a pair of drawers that are positioned below the charging rod and that draws the molten material while being rotated by driving means. 2. The laminated tube manufacturing apparatus according to claim 1, comprising a roller and an interval adjusting device capable of adjusting an interval between the pair of drawing rollers. 7. The laminated tube manufacturing apparatus according to claim 6 , wherein the drawing roller is configured to allow cooling water to pass through so as to cool the molten material drawn into the drawing roller. A waste plastic sorting stage that collects a plurality of waste plastics and removes non-plastic components such as paper, metal, glass and cloth, and sorts only pure plastic components,
Crushing the composite waste plastic to crush the plastic selected in the waste plastic sorting process below a predetermined size;
A melting and mixing stage in which the pulverized composite waste plastic is put into a twin screw melter and mixed while being heated and melted to a certain state at a certain temperature; and
An intermediate layer sheet forming step in which the composite waste plastic that has undergone the melting and mixing steps is formed and drawn out into a sheet shape having a predetermined film thickness and width by an intermediate layer feeder using a pair of drawing rollers;
Using the inner layer extruder and the outer layer extruder together with the sheet for forming the intermediate layer, a resin material sheet for forming the inner layer and the outer layer of the laminated tube is continuously wound in a spiral manner from the extrusion winder, and is cylindrical. A laminated tube forming stage for forming a tubular shape;
The laminated tube is characterized in that cooling water is sprayed onto the laminated tube formed in the above step to cool, and the laminated tube is cut and cut to a desired length, and the laminated tube is cooled and completed in order. Manufacturing method. In the melting and mixing step, the pulverized composite waste plastic is melted and mixed through the primary, secondary, and tertiary processes, but the heating temperature in the primary melting process is 240 ° C. to 280 ° C. The method for manufacturing a laminated tube according to claim 8, wherein the heating temperature in the next process is set to 180 ° C to 220 ° C lower than the temperature in the primary melting process. 9. The method for producing a laminated tube according to claim 8 , wherein in the intermediate layer sheet forming step, the sheet is supplied in such a manner that the intermediate layer sheet drawn through two drawing rollers is naturally dropped from the top to the bottom. . 9. The laminate according to claim 8 , wherein in the step of forming the laminated tube, when the sheets forming the respective layers are wound, the cooling water is directly jetted between the layers or on the surface of each layer to instantaneously cool them. A method of manufacturing a tube. The method for producing a laminated tube according to claim 11 , wherein the instantaneous cooling temperature is 100 ° C to 150 ° C. 13. The laminated tube according to claim 12 , wherein when cooling is performed by spraying the cooling water, moisture is removed by concentrated spraying of compressed air immediately before a new layer is wound around the surface of each cooled layer. Production method.

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