JP2008149550A - Apparatus for producing plastic hollow plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for producing a plastic hollow plate, when the plastic hollow plate having a wall thickness (for example, at least 300 g/m<SP>2</SP>in mass per area) is produced, a cap sheet composing the plastic hollow plate is cooled enough, the shapes of cap-shaped projections are uniform, and the cap-shaped projections are arranged regularly. <P>SOLUTION: The plastic hollow plate manufacturing apparatus 100 molds a supplied raw material having a plurality of first recesses 10a formed on a circumferential surface, obtains the cap sheet with a plurality of the cap-shaped projections formed, and is equipped with a cylindrical molding roll 10 sending the cap sheet downstream, and at least one cylindrical cooling roll 11 and 12 which is positioned downstream from the molding roll 10 and in which second recesses 11a and 12a corresponding to the cap-shaped projections are formed in its circumferential surface. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a plastic hollow plate manufacturing apparatus, and more specifically, a plastic hollow plate manufacturing apparatus for manufacturing a plastic hollow plate that is thick and excellent in compression resistance, impact resistance, thermal insulation efficiency, and the like. About.

Conventionally, plastic hollow plates (bubble boards) have been used for applications such as curing materials, packing materials, and heat insulating materials because they are lightweight and excellent in compression resistance, impact resistance, thermal insulation efficiency, and the like. This bubble board has a hollow structure in which a planar sheet is bonded to both or one side of a cap sheet on which a plurality of protrusions (cap-shaped protrusions) are formed. Further, the bubble board has, for example, a order flexural rigidity the mass per unit area and a 200g ^{/ m 2} ~3000g ^/ m 2 about the thickness of the sheet. In addition, although a bubble sheet is also known as a sheet having a hollow structure like the bubble board, the bubble sheet is distinguished from the bubble board in that it has flexibility.

  As the method for producing the bubble board, for example, first, a resin as a raw material is supplied to a melt extrusion apparatus such as an extruder, and a planar molten sheet is extruded from a slit die such as a T die. The extruded molten sheet is supplied to a molding die in which a plurality of recesses are formed, and is molded into a cap sheet having a plurality of cap-shaped protrusions by the molding die. Then, the method etc. which manufacture a bubble board by affixing the planar sheet | seat (planar sheet | seat) shape | molded with the shaping | molding different from the said cap sheet on both the surfaces of the said cap sheet, etc. are known.

  In the above-described method for producing a bubble board, the sheet is attached by thermocompression bonding of the molten sheet to a flat sheet formed by a molding die and a cap sheet. However, depending on the cooling state of the planar sheet and the cap sheet, the shrinkage amount of these sheets is different, which causes a problem that the bubble board warps after cooling. In order to solve this problem, an apparatus for joining a pre-cooled planar sheet to a cap sheet has been reported (for example, Patent Document 1).

JP 2001-269995 A

  However, the apparatus described in Patent Document 1 has an advantage in that it is possible to manufacture a bubble board that does not cause warping after the planar sheet and the cap sheet are pasted, but it is still improved. There was room for. That is, when manufacturing a thick bubble board, the cap sheet may not be sufficiently cooled due to its thickness, and the bubble board may be warped. Further, when a tension is applied to a cap sheet that is not sufficiently cooled, for example, the shape of the circular cap-shaped protrusion may be deformed into an ellipse. Furthermore, there is a possibility that the arrangement of the cap-shaped protrusions becomes non-uniform. These may cause a decrease in compression resistance, impact resistance and the like.

The present invention has been made in view of such problems of the prior art, and the problem is that when manufacturing a plastic hollow plate having a thickness (for example, a basis weight of 300 g / m ² or more), A plastic hollow plate manufacturing apparatus capable of sufficiently cooling a cap sheet constituting the plastic hollow plate to form a plastic hollow plate in which the shape of the cap-shaped protrusion is uniform and the cap-shaped protrusions are regularly arranged. provide.

  As a result of intensive studies to achieve the above-mentioned problems, the present inventors have at least one cylindrical cooling roll having a recess corresponding to the cap-shaped protrusion of the cap sheet downstream of the forming roll for forming the cap sheet. As a result, the present inventors have found that the above-described problems can be achieved, and have completed the present invention.

  That is, according to the present invention, the following plastic hollow plate manufacturing apparatus is provided.

[1] The supplied raw material having a plurality of first recesses formed on the circumferential surface is molded to obtain a cap sheet on which a plurality of cap-shaped protrusions are formed, and the cap sheet is moved downstream thereof. A hollow plastic plate manufacturing apparatus including a cylindrical molding roll to be fed, and is a cylinder which is located on the circumferential surface and is located downstream of the molding roll and corresponding to the cap-shaped protrusion. Plastic hollow plate manufacturing apparatus further comprising at least one cooling roll in the form of a tube.

[2] The plastic hollow plate manufacturing apparatus according to [1], wherein the cooling roll includes a cooling medium flow path.

[3] The plastic hollow plate manufacturing apparatus according to [1] or [2], further including a speed adjusting unit that adjusts a rotation speed (m / s) of the cooling roll according to a shrinkage amount of the cap sheet.

[4] The plastic hollow plate manufacturing apparatus according to any one of [1] to [3], wherein the second recess has a taper.

[5] Said [1]-[2] where said 2nd crevice is cylindrical, and a ratio of a diameter of said cylindrical 2nd crevice is 100-110% to a diameter of said 1st crevice. 4] The plastic hollow plate manufacturing apparatus according to any one of [4].

[6] The plastic hollow plate manufacturing apparatus according to any one of [1] to [5], wherein the cooling roll has a diameter of 0.2 to 0.7 m.

[7] The plastic hollow plate manufacturing apparatus according to any one of [1] to [6], wherein the first recess has a diameter of 5 to 50 mm and a depth of 3 to 30 mm.

The plastic hollow plate manufacturing apparatus of the present invention, when manufacturing a plastic hollow plate having a thickness (for example, a basis weight of 300 g / m ² or more), sufficiently cools the cap sheet constituting the plastic hollow plate, The effect is that a plastic hollow plate having a uniform shape and having cap-like protrusions regularly arranged can be formed.

  BEST MODE FOR CARRYING OUT THE INVENTION The best mode for carrying out the present invention will be described below, but the present invention is not limited to the following embodiment, and is based on the ordinary knowledge of those skilled in the art without departing from the gist of the present invention. It should be understood that modifications and improvements as appropriate to the following embodiments also fall within the scope of the present invention.

[1] Plastic hollow plate manufacturing equipment:
The plastic hollow plate manufacturing apparatus of the present invention molds the supplied raw material having a plurality of first recesses 10a formed on the circumferential surface, for example, like the plastic hollow plate manufacturing apparatus 100 shown in FIG. A plastic hollow plate manufacturing apparatus 100 including a cylindrical molding roll 10 that obtains a cap sheet on which a plurality of cap-shaped protrusions are formed and sends the cap sheet downstream thereof, and is located downstream of the molding roll 10. In addition, two (at least one) cylindrical cooling rolls 11 and 12 having second concave portions 11a and 12a corresponding to the cap-shaped protrusions formed on the circumferential surface thereof are further provided.

With such a configuration, when manufacturing a plastic hollow plate having a wall thickness (for example, a basis weight of 300 g / m ² or more), the cap sheet constituting the plastic hollow plate is sufficiently cooled, and the shape of the cap-shaped protrusion is uniform. Furthermore, it is possible to form a plastic hollow plate in which cap-shaped protrusions are regularly arranged.

  The plastic hollow plate manufactured by the plastic hollow plate manufacturing apparatus has a hollow structure in which a flat sheet is bonded to both sides or one side of a cap sheet. Specifically, like the plastic hollow plate 1 shown in FIG. 10, a cap sheet 2 in which a plurality of cap-shaped protrusions 2 a are formed, and a planar back sheet 3 attached to the bottom surface side of the cap sheet 2, A three-layer structure including a planar liner sheet 4 attached to the top side of the cap sheet 2 can be used. This plastic hollow plate has a sealed space in which air is enclosed by the cap-shaped protrusion and the back sheet.

  By the way, in the conventional plastic hollow plate manufacturing apparatus, in order to cool a cap sheet having a plurality of cap projections, it was allowed to cool (air-cooled). In such a cooling method, particularly when a thick cap sheet is manufactured, the cap sheet cannot be sufficiently cooled, and the cap protrusion is deformed due to the tension applied when the cooling is insufficient. There was a risk of non-uniform arrangement.

  In addition, as a cooling method when manufacturing a bubble sheet that is a thin sheet, there is a method of cooling by contacting a cooled rubber (rubber belt method), but since the thermal conductivity of rubber is low, a thick sheet is used. There is a problem that it is difficult to sufficiently cool, and that it takes time to perform maintenance due to deterioration of the rubber.

  On the other hand, since the plastic hollow plate manufacturing apparatus of the present invention includes at least one cooling roll, the cap sheet can be sufficiently cooled. Further, when the cap sheet is cooled, the cap sheet is sent out by passing between rolls, so that unnecessary tension is not applied. Therefore, there is no possibility that the cap projections formed on the cap sheet are deformed, the arrangement of the cap projections is not uniform, or the cap sheet is distorted during cooling.

[1-1] Molding roll:
The forming roll of the plastic hollow plate manufacturing apparatus according to the present invention includes a cap sheet having a plurality of first recesses formed on a circumferential surface, formed from a supplied raw material, and formed with a plurality of cap-shaped protrusions. Obtained and is a cylindrical one that feeds the cap sheet downstream. As long as it has such a configuration, the size of the molding roll is not particularly limited, but the diameter is preferably 0.2 to 0.7 m, and more preferably 0.3 to 0.6 m. Preferably, it is 0.4-0.5 m. If the diameter is less than 0.2 m, the mold may not be able to engrave the recess. On the other hand, if the diameter is greater than 0.7 m, the weight may be excessive and operation may not be possible. Moreover, the height (length) of the molding roll is preferably 0.5 to 3 m, more preferably 0.7 to 2 m, and particularly preferably 1.2 to 1.8 m. If the length is less than 0.5 m, the productivity of the plastic hollow plate tends to be poor. On the other hand, if the length is more than 3 m, the weight may be excessive and operation may become impossible.

  In addition, the number of first recesses formed on the molding roll is not particularly limited as long as it is plural, and can be appropriately determined according to the use of a curing material, a packing material, a heat insulating material, and the like.

  Upstream of the molding roll, a molten sheet supply unit for heating and melting the supplied raw materials (for example, polyolefin resins such as polyethylene and polypropylene) and supplying a sheet-like melt (melted sheet) to the molding roll Can be provided. As the molten sheet supply unit, for example, a flat die or the like can be used. For example, the plastic hollow plate manufacturing apparatus 100 shown in FIG. 1 is an example in which a flat die 15 is provided upstream of the molding roll 10 and the molten sheet 16 is supplied from the flat die 15.

[1-1-1] First recess:
The plurality of first concave portions are not particularly limited in shape and arrangement as long as they are formed on the circumferential surface of the molding roll. The shape may be, for example, a cylindrical shape, a quadrangular prism shape, a polygonal prism shape, a conical shape, a quadrangular pyramid shape, a polygonal pyramid shape, or the like. In addition, the shape which has a taper in some of these shapes may be sufficient. Among these shapes, a cylindrical shape or a cylindrical shape having a taper is preferable from the viewpoint of producing a plastic hollow plate excellent in compression resistance, impact resistance, heat shielding efficiency, and the like. Moreover, the arrangement of the first recesses of the forming roll can be, for example, a grid shape, a honeycomb shape, or the like. For example, the molding roll 10 of the plastic hollow plate manufacturing apparatus 100 shown in FIG. 4 is an example in which cylindrical first concave portions are arranged in a honeycomb shape.

  When the shape of the first recess of the molding roll is a columnar shape or a cylindrical shape having a taper, the diameter is preferably 5 to 50 mm, and the depth is preferably 3 to 30 mm. . The diameter is more preferably 6 to 40 mm, and particularly preferably 7.5 to 30 mm. If the diameter is less than 5 mm, formation by machining may be difficult, and vacuum suction for forming cap-shaped protrusions may be difficult. On the other hand, if the diameter exceeds 50 mm, the mold may not be removed.

  Further, the depth is more preferably 5 to 20 mm. If the depth is less than 3 mm, the effect of weight reduction obtained by hollowing the plastic hollow plate may be reduced. On the other hand, if the depth is more than 30 mm, the mold may not be removed. For example, the 1st recessed part 10a formed in the shaping | molding roll 10 of the plastic hollow plate manufacturing apparatus 100 shown in FIG. 6 is the columnar shape which has a taper, the diameter L is 7.5 mm, and the depth D is 4 mm. This is an example.

  It is preferable that a suction passage that communicates the first recess and the outside is formed in the molding roll. Furthermore, a suction device is preferably connected to the suction passage. With such a configuration, when a molten sheet exists on the circumferential surface of the forming roll, when the air in the suction passage is exhausted by the suction device, a cap protrusion corresponding to the first recess is formed on the molten sheet. be able to. The suction device is not particularly limited as long as it can suck the air in the molding roll, and for example, a vacuum pump, a suction blower, or the like can be used. Further, the suction passage may be formed inside the molding roll as long as the first recess communicates with the outside. For example, the molding roll 10 of the plastic hollow plate manufacturing apparatus 100 shown in FIG. 5 is an example in which a suction passage 21 that communicates each first concave portion 10a to the outside is formed.

  In addition, the said forming roll can be equipped with the flow path for cooling media in the inside. By forming the cooling medium flow path in the molding roll, there is an advantage that the cooling rate of the molten sheet can be adjusted also in the molding roll. The shape of the flow path for the cooling medium is not particularly limited, and for example, a plurality of linear through paths that pass through both end faces of the molding roll, or a single through path formed in a spiral shape inside the molding roll. can do. For example, the molding roll 10 of the plastic hollow plate manufacturing apparatus 100 shown in FIG. 5 is an example in which the central portion includes a cooling medium flow path 22 having a cylindrical space concentric with the molding roll 10. Note that the arrows in FIG. 5 indicate the flow of the cooling medium.

  Examples of the cooling medium that can flow into the cooling medium flow path include water and oil. Among these, it is preferable to use water. The cooling medium is preferably a liquid whose temperature has been adjusted in advance, and the temperature can be adjusted as appropriate.

[1-2] Cooling roll:
It is a cylindrical thing located in the said downstream of the said forming roll, and the 2nd recessed part corresponding to the said cap-shaped protrusion was formed on the circumferential surface. It is sufficient that at least one cooling roll is provided, and the number and arrangement thereof are not particularly limited and can be appropriately selected.

  Note that “downstream” means a step close to the step of obtaining a plastic hollow plate when the step of producing a plastic hollow plate from raw materials such as polyolefin resin is divided into a plurality of steps. For example, the step of attaching the planar sheet to the cap sheet is a step located downstream of the step of supplying the molten sheet to the forming roll.

  For example, the plastic hollow plate manufacturing apparatus 100 shown in FIG. 1 is an example in which the molding roll 10 and the two cooling rolls 11 and 12 are arranged in a step shape in which the molding roll 10 is positioned at the uppermost stage. Moreover, for example, the plastic hollow plate manufacturing apparatus 101 shown in FIG. 2 is an example in which the molding roll 10 and the two cooling rolls 11 and 12 are arranged in the vertical direction, and the molding roll 10 is arranged at the top. Further, for example, the plastic hollow plate manufacturing apparatus 102 shown in FIG. 3 is an example in which the molding roll 10 and the two cooling rolls 11 and 12 are arranged in a step shape in which the molding roll 10 is positioned at the uppermost stage.

  The size of the cooling roll is not particularly limited as long as it has the above configuration, but the diameter is preferably 0.5 to 3 m, more preferably 0.7 to 2 m, and 1.2. It is especially preferable that it is -1.8m. When the diameter is less than 0.5 m, the productivity of the plastic hollow plate tends to be poor. On the other hand, when the diameter is more than 3 m, it is difficult to produce, and it may be difficult to obtain a sufficient cooling effect.

  Moreover, the height (length) of the cooling roll has the same length as the molding roll, and preferably has the same length as the molding roll.

[1-2-1] Second recess:
The second recess corresponds to the cap-shaped protrusion. Here, “corresponding to the cap-shaped protrusion” means that the cap sheet is formed in a shape and an arrangement that does not crush the plurality of cap-shaped protrusions of the cap sheet sent from the molding roll. For example, when the cap sheet is not contracted by cooling or hardly contracted, the cap sheet can have the same shape and the same arrangement as the first recess. Further, for example, when the first concave portion is cylindrical, that is, when the cap-shaped protrusion is cylindrical, the second concave portion has a diameter larger than that of the first concave portion. It can also be formed, and can also be tapered (conical).

  For example, the cooling roll 11 of the plastic hollow plate manufacturing apparatus 100 shown in FIGS. 7 to 9 is an example including a second conical (concave) recess 11a. With such a configuration, when the cylindrical cap protrusion is fitted into the second recess, it is possible to reliably prevent the cap protrusion from coming into contact with the wall surface of the second recess and being crushed.

  When the first recess and the second recess are cylindrical, the ratio of the diameter of the opening end of the second recess is 100 to 110% with respect to the diameter of the first recess. Preferably, it is 100 to 105%, more preferably 100 to 103%. If the ratio is less than 100%, the cap protrusion formed by the first recess is crushed without fitting into the second recess. On the other hand, if it exceeds 110%, the cap protrusion may not be sufficiently cooled.

  When the first concave portion is cylindrical and the second concave portion is conical, the diameter of the bottom surface of the second concave portion is larger than the diameter of the cylindrical first concave portion. The ratio of the diameter of the opening end of the recess is preferably 100 to 110%, more preferably 100 to 105%, and particularly preferably 100 to 103% with respect to the diameter of the first recess. preferable. If the ratio is less than 100%, the cap protrusion formed by the first recess is crushed without fitting into the second recess. On the other hand, if it exceeds 110%, the cap protrusion may not be sufficiently cooled. For example, the second recess 11a formed in the cooling roll 11 of the plastic hollow plate manufacturing apparatus 100 shown in FIGS. 7 to 9 has a ratio of the diameter X of the opening end of the second recess 11a as the first recess. This is an example of 103% with respect to the diameter L of 10a. Specifically, when the diameter L of the first recess 10a is 7.5 mm and the depth D is 5 mm, the diameter X of the second recess 11a is 7.75 mm, as shown in FIG. The depth Y can be 5 mm.

  The cooling means of the cooling roll is not particularly limited, but is preferably cooled by the cooling medium already described above. That is, the cooling roll can be provided with a cooling medium flow path similar to the cooling medium flow path already formed in the molding roll. Note that the arrows in FIG. 8 indicate the flow of the cooling medium.

  In addition, as the cooling roll, a molding roll having a cooling function by providing a cooling medium flow path therein and allowing the cooling medium to flow into the flow path can also be used.

[1-3] Speed adjustment means:
The plastic hollow plate manufacturing apparatus of the present invention preferably includes speed adjusting means for adjusting the rotational speed (m / s) of the cooling roll according to the shrinkage amount of the cap sheet. This speed adjusting means adjusts the rotational speed (m / s) of the cooling roll according to the amount of shrinkage when the cap sheet molded by the molding roll is cooled by the molding roll and the cooling roll. is there. Note that “according to the amount of shrinkage of the cap sheet” means that the amount of shrinkage of the cap sheet varies depending on the raw materials, cooling temperature, molding temperature, and other conditions. m / s) is adjusted. Specifically, the amount of shrinkage of the cap sheet when a predetermined raw material is used and cooled at a predetermined cooling temperature is measured in advance, and the rotation speed (m / s) of the cooling roll is adjusted in accordance with the amount of shrinkage. Can be set.

  As the speed adjusting means, for example, a motor drive individually connected to each roll can be used.

[1-4] Other components:
The plastic hollow plate manufacturing apparatus of the present invention includes a planar sheet supply unit, a planar sheet molding roll, a pressure roll (rolling roll), an adhesive layer supply unit, in addition to the molding roll, cooling roll, and speed adjusting means. Other known members such as a board cooling means and a heating roll can be provided.

  The flat sheet supply unit heats and melts the supplied raw materials (for example, polyolefin resins such as polyethylene and polypropylene), and then supplies the melt (melted sheet) in a sheet form. For example, a flat die can be used. A flat sheet forming roll for forming the molten sheet into a flat shape is disposed downstream of the flat sheet supply unit. For example, the plastic hollow plate manufacturing apparatus 100 shown in FIG. 1 includes a flat sheet molding roll 30 for molding the back sheet 3 to be attached to the opening side of the cap projection 2 a of the cap sheet 2, and the cap projection of the cap sheet 2. It is an example provided with the planar sheet forming roll 31 which shape | molds the liner sheet 4 affixed on the vertex side of 2a.

  The adhesive supply unit is for supplying an adhesive for attaching the cap sheet and the planar sheet. As this adhesive, for example, an adhesive resin obtained by graft polymerization of a polar group on a polyolefin resin or a polyolefin resin can be used. In addition, the said adhesive agent can be made into a gel form, a film form, etc. Moreover, a flat die etc. can be used for an adhesive supply part. For example, in the plastic hollow plate manufacturing apparatus 100 shown in FIG. 1, a film-like adhesive 35 a supplied from an adhesive supply unit 35 made of a flat die is used between the cap sheet 2 and the back sheet 3, and the cap sheet 2. It is an example which supplies between liner sheets 4. In addition, since the film-like adhesive is thinner than each sheet, problems such as warpage due to shrinkage do not occur.

  Moreover, instead of providing the adhesive supply part, a heating roll for heating the surface of the cap sheet can be arranged downstream of the cooling roll. This heating roll heats and partially melts the surface of the cap sheet cooled by the cooling roll, and these are heat-sealed by bonding the surface of the melted cap sheet and the flat sheet. Can be made. The heating roll is not particularly limited as long as it can heat the surface of the cap sheet, and a known one can be used. For example, a roll provided with a coil inside and heated when the coil generates heat, a roll heated externally, or the like can be used. In addition, the said heating roll is for heating the surface of a cap sheet to such an extent that the said heat fusion is possible, Comprising: It does not heat to the extent which causes a deformation | transformation of a cap projection part or a change of an arrangement | sequence.

  The pressure roll (rolling roll) rolls the plastic hollow plate having residual heat after the sheets are laminated to form a three-layer plastic hollow plate. This rolling roll is configured so that the roll interval between a pair of rolling rolls facing each other with a plastic hollow plate interposed therebetween is gradually reduced from the upstream side toward the downstream side. The thickness of the plastic hollow plate can be adjusted by setting the roll interval between the pair of rolling rolls. For example, the plastic hollow plate manufacturing apparatus 100 shown in FIG. 1 is an example in which four pairs of rolling rolls 36 facing each other with a composite layer sandwiched between a cap sheet 2, a back sheet 3, a liner sheet 4, and an adhesive 35a are provided. is there.

  The board cooling means is provided downstream of the pressure roll. The board cooling means is disposed at a position facing the plastic hollow plate and cools the plastic hollow plate. Examples of the board cooling means include a cooling belt, a cooling fan, and a cooling roll. For example, the plastic hollow plate manufacturing apparatus 100 shown in FIG. 1 is an example in which a cooling belt 37 that cools a composite layer sandwiched from above and below from a cap sheet 2, a back sheet 3, a liner sheet 4, and an adhesive 35a.

  Next, a method for producing a plastic hollow plate using the plastic hollow plate production apparatus of the present invention will be described based on the plastic hollow plate production apparatus 100 shown in FIG.

  First, the raw material of the cap sheet 2 (for example, a polyolefin resin such as polyethylene or polypropylene) is supplied, heated and melted, and then the molten sheet 16 is supplied to the molding roll 10 from the molten sheet supply unit 15 formed of a flat die. A part of the molten sheet 16 supplied to the molding roll 10 is molded into a plurality of cap projections 2a by being sucked into the first recess 10a on the molding roll 10. The molten sheet 16 provided with the cap protrusion 2a is referred to as a cap sheet 2.

  Subsequently, the cap sheet 2 is cooled by the first cooling roll 11 and the second cooling roll 12. This cooling step is performed as follows. First, the first cooling roll 11 is configured so that the cap projection 2 a of the cap sheet 2 is fitted into the second recess 11 a of the first cooling roll 11. Undertake in sync. And the 1st cooling roll 11 which received the cap sheet 2 cools the cap sheet 2 in the state which made the cap sheet 2 contact on the circumferential surface. At this time, since the tension applied to the cap sheet 2 to send out the cap sheet 2 is small, the shape and arrangement of the cap protrusions 2a of the cap sheet 2 are maintained.

  Further, the second cooling roll 12 is configured so that the cap sheet 2 is synchronized with the second protrusion 12a of the second cooling roll 12 so that the cap protrusion 2a fits into the second recess 12a of the second cooling roll 12. Take on from 11. Thereafter, the cap sheet 2 is cooled by the second cooling roll 12 while being in contact with the circumferential surface of the second cooling roll 12. At this time, since the tension applied to the cap sheet 2 to send out the cap sheet 2 is small, the shape and arrangement of the cap protrusions 2a of the cap sheet 2 are maintained. As described above, since the cap sheet is sufficiently cooled by the first cooling roll and the second cooling roll, it is assumed that tension is applied to the cap sheet downstream of the second cooling roll. Even if it exists, the shape and arrangement of the cap projections will not change.

  In addition, the said cap sheet | seat can be cooled while a some cap projection part is shape | molded with a shaping | molding roll (1st cooling). When performing this 1st cooling, it is preferable to cool the said cap sheet to 150-160 degreeC by 1st cooling. Thereafter, the cap sheet is preferably cooled to 110 to 120 ° C. in the first cooling roll, and is preferably cooled to 70 to 80 ° C. in the second cooling roll.

  On the other hand, after the raw material of the liner sheet 4 (for example, polyolefin resin such as polyethylene and polypropylene) is supplied and heated and melted, the molten sheet 216 is supplied to the flat sheet forming roll 31 from the flat sheet supply unit 41 formed of a flat die. Supply. The molten sheet 216 supplied to the planar sheet forming roll 31 constitutes a planar liner sheet 4. Similarly, the raw material of the back sheet 3 (for example, polyolefin resin such as polyethylene and polypropylene) is supplied, heated and melted, and then the molten sheet 116 is transferred from the flat sheet supply unit 40 formed of a flat die to the flat sheet forming roll 30. To supply. The molten sheet 116 supplied to the planar sheet forming roll 30 constitutes a planar back sheet 3.

  Next, the back sheet 3 is attached to the bottom surface side of the cap sheet 2, and the liner sheet 4 is attached to the top side of the cap sheet 2. The plastic hollow plate manufacturing apparatus 100 shown in FIG. 1 is an adhesive comprising a flat die for supplying a film-like adhesive 35a between the cap sheet 2 and the back sheet 3 and between the cap sheet 2 and the liner sheet 4. An agent supply unit 35 is provided. After supplying the film-like adhesive 35a to the predetermined position, the back sheet 3 and the liner sheet 4 are attached to the cap sheet 2 by the pressure roll 36, and adjusted to a predetermined thickness.

  The back sheet 3 and the liner sheet 4 can be cooled in advance before being attached to the cap sheet 2. When the back sheet 3 and the liner sheet 4 are cooled in advance as described above, it is possible to more effectively prevent the warpage of the plastic hollow plate due to the contraction when each sheet is cooled.

  Then, the back sheet 3 and the liner sheet 4 are attached to the cap sheet 2, adjusted to a predetermined thickness, and then cooled by the board cooling means 37. At this time, it is preferable to perform rapid cooling from the viewpoint of more reliably preventing the occurrence of warpage. As described above, the plastic hollow plate 1 can be manufactured. In addition, this plastic hollow plate 1 can be cut | judged to a desired magnitude | size as needed.

  The plastic hollow plate manufacturing apparatus of the present invention can be particularly suitably used as an apparatus for manufacturing a plastic hollow plate excellent in compression resistance, impact resistance, heat insulation efficiency, and the like.

It is a conceptual diagram which shows one Embodiment of the plastic hollow plate manufacturing apparatus of this invention. It is a conceptual diagram which shows another embodiment of the plastic hollow plate manufacturing apparatus of this invention. It is a conceptual diagram which shows another embodiment of the plastic hollow plate manufacturing apparatus of this invention. It is a perspective view which shows one Embodiment of the molding roll of the plastic hollow plate manufacturing apparatus of this invention. It is sectional drawing which shows one Embodiment of the molding roll of the plastic hollow plate manufacturing apparatus of this invention. It is sectional drawing which expands and shows one of the 1st recessed parts of the molding roll shown in FIG. It is a perspective view which shows one Embodiment of the roll for cooling of the plastic hollow plate manufacturing apparatus of this invention. It is sectional drawing which shows one Embodiment of the roll for cooling of the plastic hollow plate manufacturing apparatus of this invention. It is sectional drawing which expands and shows one of the 2nd recessed parts of the cooling roll shown in FIG. It is a perspective view which shows one Embodiment of the plastic hollow plate manufactured with the plastic hollow plate manufacturing apparatus of this invention.

Explanation of symbols

1: plastic hollow plate, 2: cap sheet, 3: back sheet, 4: liner sheet, 10: molding roll, 10a: first recess, 11, 12: cooling roll, 11a, 12a: second recess, 15: Melted sheet supply unit, 16, 116, 216: Melted sheet, 21: Passage for suction, 22: Flow path for cooling medium, 30, 31: Planar sheet forming roll, 35: Adhesive supply unit, 35a: Adhesion Agent, 36: rolling roll, 37: cooling belt, 40, 41: planar sheet supply unit.

Claims (7)

A cylinder having a plurality of first recesses formed on a circumferential surface, molding a supplied raw material, obtaining a cap sheet having a plurality of cap-shaped protrusions, and feeding the cap sheet downstream thereof A plastic hollow plate manufacturing apparatus provided with a shaped molding roll,
An apparatus for manufacturing a plastic hollow plate, further comprising at least one cylindrical cooling roll positioned downstream of the molding roll and having a second recess corresponding to the cap-shaped protrusion formed on a circumferential surface thereof.   The plastic hollow plate manufacturing apparatus according to claim 1, wherein the cooling roll includes a cooling medium flow path.   The plastic hollow plate manufacturing apparatus of Claim 1 or 2 provided with the speed adjustment means which adjusts the rotational speed (m / s) of the said roll for cooling according to the shrinkage | contraction amount of the said cap sheet | seat.   The plastic hollow plate manufacturing apparatus according to any one of claims 1 to 3, wherein the second recess has a taper.   The said 2nd recessed part is cylindrical, The ratio of the diameter of the said 2nd cylindrical recessed part is 100 to 110% with respect to the diameter of said 1st recessed part, The any one of Claims 1-3 The plastic hollow plate manufacturing apparatus according to the item.   The diameter of the said roll for cooling is 0.2-0.7m, The plastic hollow plate manufacturing apparatus as described in any one of Claims 1-5.   The diameter of the said 1st recessed part is 5-50 mm, and the depth is 3-30 mm, The plastic hollow plate manufacturing apparatus as described in any one of Claims 1-6.

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