JP2007203666A - Tenter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tenter which can easily draw a bubble board with bubbles distributed to its side edge or its vicinity. <P>SOLUTION: The tenter has a plurality of sets of a pair of turnable holding bodies X211 and X212 which has turnable holding surfaces X211a and X212a rotating at a speed corresponding to the conveyance speed of the bubble board B and holds the edge part of the bubble board B by the turnable holding surfaces X211a and X 212a. A pair of the turnable holding bodies X211 and X212 is arranged to apply biasing force in the width extension direction to the bubble board B being conveyed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a tenter device used when manufacturing a plastic hollow plate or the like.

  Recently, plastic hollow plates that can be used in a wide range of fields as interior materials for automobiles have been developed, and as manufacturing methods thereof, for example, the following are known.

  A cap sheet material that is sequentially supplied from the first die in a thermoplastic state is formed by a forming roll connected to a vacuum suction source to continuously form a cap sheet having a large number of cap-shaped protrusions. The sheet material for the back sheet that is sequentially supplied from the second die in the thermoplastic state is pressed against the cap sheet by the pressure roll. By this process, the back sheet is sequentially bonded to the back surface of the cap sheet, and a bubble board having a two-layer structure is continuously generated. And while maintaining this bubble board in an elastic body state with uniform temperature distribution, while conveying in a fixed direction, the bubble board is extended in the widening direction using the tenter apparatus in the middle of the conveyance. Thereafter, a liner sheet is attached to the cap top side of the stretched bubble board to produce a three-layer product, and the three-layer product is cooled to obtain a plastic hollow plate as a product (for example, Patent Document 1). .

  Here, the reason why the foam board is stretched by using the tenter device is to allow the foam board to reasonably follow and deform as the bonded liner sheet cools and shrinks. A product without warping can be obtained.

In addition, since the conventional bubble board produced intermediately by the manufacturing method as described above has flat ears without bubbles on both side edges, the conventional tenter device uses a clip to clip the flat ears. By sandwiching and energizing outward, the bubble board can be stretched in the widening direction.
JP 2002-326297 A (FIG. 3 etc.)

  Recently, the inventors have attempted to produce a plurality of types of bubble boards having different widths using a common forming roll for the purpose of improving production efficiency without incurring complicated facilities. Has been made. Therefore, when trying to make a narrow bubble board without using the entire roll width with a common forming roll, bubbles are generated up to the edge of the bubble board, and there is no flat ear. There is a case. Therefore, in the conventional tenter device that pinches and pulls a flat ear portion by a clip, a portion where bubbles are present cannot be pinched accurately, and there is a problem that an appropriate stretching function cannot be exhibited. .

  The present invention has been made paying attention to such a problem, and the main purpose thereof is that, for example, bubbles exist up to the side edge or the vicinity thereof, such as a bubble board manufactured by the above method. An object of the present invention is to provide a tenter device capable of exerting a stretching action on a bubble board without difficulty.

  That is, the tenter device according to the present invention is disposed at a side portion of the board conveyance path where the bubble board is conveyed in a certain direction, and the edge of the bubble board being conveyed is attached outward in a predetermined extension region. A rotating pinching surface that rotates at a speed corresponding to the conveyance speed of the bubble board, and a rotation that forms a pair that holds the edge of the bubble board by the rotating pinching surface A plurality of sandwiching bodies are provided, and the pair of rotating sandwiching bodies are arranged so as to apply a biasing force in the widening direction to the bubble board being transported.

  Here, the “speed corresponding to the conveyance speed of the bubble board” may be the same speed as the conveyance speed of the bubble board, or with respect to the conveyance speed of the bubble board so that the bubble board has various stretching patterns. It may be a speed with a plus or minus error. Further, the speed may be varied for each group.

  Further, the rotation clamping “surface” may be either a flat surface or a curved surface, or a combination of a flat surface and a curved surface.

  If it is such, compared with the aspect which pinches the ear | edge part of a bubble board with a clip, ie, the part which does not have a bubble, the rotation clamping body which rotates the edge part of a bubble board irrespective of the presence or absence of a bubble It is possible to smoothly draw in between the rotating and clamping surfaces of the plate, and it is possible to exert a stretching action on the bubble board without difficulty by pulling the drawn edge portion outward.

  As a suitable embodiment of a rotation clamping body, the pinch roll which makes an outer peripheral surface the said rotation clamping surface, and the endless track belt which makes an outer surface the said rotation clamping surface are mentioned.

  In order to stretch the bubble board smoothly and accurately, it is desirable that the conveyance direction of the bubble board by the pair of rotating sandwiching bodies be deflected outward with respect to the center line of the board conveyance path.

  In particular, among the rotation holding surfaces of the pair of rotation holding bodies, a plurality of protrusions that mesh with the protrusions are provided on the rotation holding surface that contacts the front side surface on which the plurality of protrusions of the bubble board are present. For example, when the protrusion and the protrusion are engaged with each other, there is no problem that the holding state of the bubble board is unexpectedly released in the extending region, and the holding operation is excellent in stability.

  When the rotating sandwiching body is a pinch roll whose outer peripheral surface is the rotating sandwiching surface, a plurality of pairs of the paired pinch rolls are arranged at intervals in the conveying direction of the bubble board. If the conveyance speeds of these are made different, the stretching pattern (stretching pattern) of the bubble board can be appropriately changed, and various specifications can be flexibly handled.

  When the rotating clamping body is an endless track band having the outer surface as the rotating holding surface, the bubble board being transported in the extending region can always be clamped by the paired endless track band, If a plurality of pairs of the endless track bands forming a pair are arranged in an overlapping manner, the edge of the bubble board being conveyed can be constantly urged outward in the extension region, and an appropriate stretching mechanism is exhibited. In this case, a plurality of needles shorter than the entire thickness of the bubble board are provided on the rotation holding surface of the rotation holding surface of the rotation holding body that is paired and in contact with the flat back side surface of the bubble board. If this protrusion is provided, each needle functions as a spike, and it is possible to prevent a problem that the bubble board being conveyed is suddenly released from being held by the rotating holding surface and detached.

  As described above, according to the present invention, since the edge of the bubble board is sandwiched between the rotation holding surfaces of the rotating rotation holding body, the edge of the bubble board is attached regardless of the presence or absence of bubbles. It can be pulled in smoothly, and the drawing action can be appropriately exerted on the bubble board by pulling the drawn edge outward.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  The tenter device X21 according to the present embodiment constitutes a part of a plastic hollow plate manufacturing machine X that manufactures the plastic hollow plate P shown in FIG.

  The plastic hollow plate manufacturing machine X mainly sticks a liner sheet SL to the first forming region X1 for forming the two-layered bubble board B, the extending region X2 for extending the bubble board B in the widening direction, and the bubble board B. A second molding region X3 for forming a three-layer plastic hollow plate P, a cooling region X4 for cooling the plastic hollow plate P, and a cutting region X5 for cutting the cooled plastic hollow plate P to a predetermined dimension. I have it.

  In the first molding region X1, a cap sheet material supply device X11 that supplies the cap sheet material SCa and a cap sheet material that is connected to the vacuum suction device X12v and supplied from the cap sheet material supply device X11. A vacuum forming roll X12 for forming a large number of cap-shaped protrusions on the sheet material SCa, a backsheet sheet material supplying device X13 for supplying a backsheet sheet material SBa, and a cap having a large number of protrusions formed by the vacuum forming roll X12 A pressure roll X14 that presses and adheres the backsheet sheet material SBa supplied from the backsheet sheet material supply device X13 to the back side of the sheet SC, and a peeling roll X15 that peels the bubble board B from the vacuum forming roll X12. And a pair of pinches to pinch the bubble board B It is disposed Lumpur X16.

  The cap sheet material supply device X11 includes, for example, a cap sheet material extruder X111 and a cap sheet die X112. In this embodiment, the cap sheet sheet material extruder X111 The main extrusion machine X111a and the sub-extrusion machine X111b are configured so that the sheet material SCa for the cap sheet for two types and three layers can be supplied from the die X112 for the cap sheet.

  As shown in FIG. 2, the vacuum forming roll X12 is formed from one end of the roll body to the other end and is opened at both ends. The suction side holes X122 and suction holes X123 provided on the bottom wall of each suction cavity X121 and communicating with the corresponding suction side holes X122 are provided. Both ends can be connected to the vacuum exhaust device X12v. In this embodiment, the opening rate of the suction hole X123 in the central region X12a of the roll body is set to the opening rate of the suction hole X123 in the end region X12b. Is also set to a large value.

  The backsheet sheet material supply device X13 includes, for example, a backsheet sheet material extruder X131 and a backsheet die X132. In this embodiment, the backsheet sheet material extruder X131 The main extruder X131a and the sub-extruder X131b are configured to allow the backsheet sheet XBa to be supplied from the backsheet die X132.

  In this embodiment, as the cap sheet die X112 and the backsheet die X132, an outer deckle is slidably disposed on the outer side of the lip, and a T die whose sheet width can be varied within a predetermined dimension is applied. Yes.

  The pressure roll X14 is, for example, provided so as to be able to come in contact with and separate from the vacuum forming roll X12, close to the vacuum forming roll X12 during operation, and separated from the vacuum forming roll X12 when stopped (including during an emergency stop). It is.

  The peeling roll X15 is provided, for example, so as to be able to come into contact with and separate from the vacuum forming roll X12, close to the vacuum forming roll X12 during operation, and separated from the vacuum forming roll X12 when stopped (including during an emergency stop). is there. Further, the peeling roll X15 according to the present embodiment functions as a drive shaft, and is set so that the vacuum forming roll X12 and the pressure roll X14 rotate following the rotation of the peeling roll X15. Yes.

  The stretching region X2 will be described later.

  In the second molding region X3, the liner sheet material supply device X31 for supplying the liner sheet material SLa and the liner sheet material SLa supplied from the liner sheet material supply device X31 are sequentially cooled. Liner that functions as an adhesive that bonds the sheet material SLa for liner sheet and the cap sheet SC of the bubble board B that have passed through the first cooling roll X32 and the second cooling roll X33, and the first cooling roll X32 and the second cooling roll X33. Liner sheet laminate film supply device X34 for supplying sheet laminate film LL, and backsheet laminate film LB for supplying backsheet laminate film LB to be pasted to backsheet SB that has passed or has passed through stretched region X2 Supply device X 5, is disposed a first nip roll X36 and the second nip roll X37 pairs.

  The liner sheet material supply device X31 is composed of, for example, a liner sheet material extruder X311 and a liner sheet die X312. In this embodiment, the liner sheet material extruder X311 is used. The main extrusion machine X311a and the sub-extrusion machine X311b are configured so that two or three layers or two or two layers of liner sheet material SLa can be supplied from the liner sheet die X312.

  The first cooling roll X32 and the second cooling roll X33 are continuously arranged in this order at positions spaced apart from the liner sheet sheet material supply device X31 by a predetermined dimension. In the present embodiment, the second cooling roll X33 is disposed. Is provided so as to be able to come into contact with and separate from the first cooling roll X32, set close to the first cooling roll X32 during operation, and set apart from the first cooling roll X32 when stopped (including emergency stop). is doing.

  The liner sheet laminate film supply device X34 includes, for example, a liner sheet laminate film extruder X341 and a laminate film die X342. In the present embodiment, the liner sheet laminate film extruder X341 includes the liner sheet laminate film extruder X341. It is composed only of the main extruder, and the laminate film LL for liner sheet can be supplied from the die for laminated film X342.

  The backsheet laminate film supply device X35 includes, for example, a backsheet laminate film extruder X351 and a laminate film die X352. In this embodiment, the backsheet laminate film extruder X351 The back-sheet laminate film LB can be supplied from the laminate film die X352.

  In this embodiment, as the liner sheet dice X312 and the laminate film dice X342 and X352, substantially the same as the cap sheet dice X112 are applied.

  The first nip roll X36 and the second nip roll X37 are provided at positions facing each other with the bubble board B interposed therebetween. In the present embodiment, the second nip roll X37 is provided so as to be able to come in contact with and separate from the first nip roll X36. It is sometimes set close to the first nip roll X36 and separated from the first nip roll X36 when stopped (including an emergency stop).

  In the cooling region X4, one or a plurality of air knives X41 for cooling the plastic hollow plate P that has passed through or is passing through the second molding region X3 from both outer surfaces are disposed.

  In the cutting area X5, one or a plurality of auto cutters X51 for cutting the plastic hollow plate P that has passed through the cooling area X4 are disposed.

  Therefore, a tenter device X21 for urging the edge of the bubble board B outward is disposed in the extending region X2. In the present embodiment, as shown in FIG. 3, tenter devices X <b> 21 are disposed on both sides of the board conveyance path through which the bubble board B is conveyed.

  The tenter device X21 is as shown in FIGS. 3 and 4 (FIGS. 4A and 4B are diagrams schematically showing the X direction arrow view and the Y direction arrow view in FIG. 3, respectively). , A plurality of pairs of first rotation holding body X211 and second rotation holding body X212 that are provided so as to be able to hold the edge of the bubble board B, and the first rotation holding body X211 that forms these pairs The second rotary holding body X212 is disposed so as to apply a biasing force in the widening direction to the bubble board B transported through the extending region X2.

  The first rotation clamping body X211 and the second rotation clamping body X212 have the first rotation clamping surface X211a and the second rotation clamping surface X212a that rotate at a speed corresponding to the conveyance speed of the bubble board B, respectively, as outer peripheral surfaces. The edge part of the bubble board B is clamped between the 1st rotation clamping surface X211a and the 2nd rotation clamping surface X212a.

  In the present embodiment, the first rotation holding body X211 is in contact with the front side where the projection of the bubble board B exists, that is, the surface on the cap sheet SC side, and the second rotation holding body X212 is flat on the bubble board B. It is in contact with the back side, that is, the surface on the back sheet SB side. A plurality of protrusions X211ax that mesh with the protrusions of the bubble board B are provided on the first rotation holding surface X211a of the first rotation holding body X211. As the protrusion X211ax, for example, as shown in FIG. 4, it is preferable that the protrusion X211ax has a substantially conical shape so that the tip is rounded so that the protrusion does not break through when engaged. The protruding dimension of each protruding body X211ax is shorter than the overall thickness of the bubble board B. On the other hand, the second rotation clamping surface X212a of the second rotation clamping body X212 is composed of only a flat curved surface, and the separation dimension between the second rotation clamping surface X212a and the first rotation clamping surface X211a is set as follows. It is set to be approximately the same as or slightly larger than the entire thickness of the bubble board B.

  The conveyance direction of the bubble board B by the first rotation holding body X211 and the second rotation holding body X212 that make such a pair is deflected outward with respect to the center line BL of the board conveyance path (see FIG. 3). ). In the present embodiment in which the tenter devices X21 are disposed on both sides of the extending region XA2, the virtual axis X21L along the rotation direction of the first rotation clamping surface X211a and the second rotation clamping surface X212a is the center of the board conveyance path. The line BL has a substantially square shape in plan view with the line BL at the center. In addition, a plurality of pairs of the first rotation holding body X211 and the second rotation holding body X212 that form a pair are arranged at intervals in the conveyance direction of the bubble board B, and the conveyance speed between these groups, in other words, rotation. The dynamic speed is set to be different. In the present embodiment, a total of three pairs of the first rotation holding body X211 and the second rotation holding body X212 that make a pair are arranged at the start end portion, the intermediate portion, and the end portion of the extending region X2. These sets of virtual axis lines X21L are positioned on substantially the same straight line.

  Next, a method and an operation of manufacturing the plastic hollow plate P using the plastic hollow plate manufacturing machine X provided with such a tenter device X21 will be described with reference to FIG.

  First, in the first molding region X1, a film-like cap sheet material SCa in a thermoplastic state is sequentially supplied from the cap sheet material supply device X11 to the rotating vacuum forming roll X12, and is supplied to the vacuum exhaust device X12v. The cap sheet SC having a number of protrusions corresponding to the shape of the suction cavity X121 is continuously formed by the vacuum suction action of the connected vacuum forming roll X12. At this time, since the aperture ratio of the suction hole X123 in the central region X12a of the roll body of the vacuum forming roll X12 is set to a value larger than the aperture ratio of the suction hole X123 in the end region X12b, each region (central portion) The suction force in the region X12a and the end region X12b) is made uniform, and each protrusion is molded with high accuracy. In the present embodiment, a narrow cap sheet SC is generated using the central region X12a without using the entire width of the vacuum forming roll X12. As a result, the cap sheet SC to be generated has a projection formed to the side edge or the vicinity of the side edge.

  On the other hand, a film-like backsheet sheet material SBa in a thermoplastic state is sequentially supplied from the backsheet material supply device X13 to the vacuum forming roll X12, and the backsheet sheet material SBa is supplied by the pressure roll X14. Affix to the back side of the cap sheet SC. As a result, a two-layered bubble board B composed of a cap sheet SC and a back sheet SB and having a large number of bubbles sealed in a sufficient vacuum state is formed, and then peeled off from the vacuum forming roll X12 by the peeling roll X15. , Transition to pinch roll X16. The bubble board B conveyed from the pressure roll X14 to the peeling roll X15 is adjusted to an appropriate temperature by an air knife (not shown).

  The bubble board B that has passed through the first molding region X1 becomes an elastic body with a uniform temperature distribution, and in the stretching region X2, both edges thereof are stretched outward by the action of the tenter device X21. A detailed description of the operation of the tenter device X21 will be given later. The bubble board B extended in the widening direction is continuously conveyed to the second molding region X3.

  In the second molding region X3, the bubble board B is supplied with the liner sheet material SLa supplied from the liner sheet material supply device X31 and passed through the first cooling roll X32 and the second cooling roll X33, and the first nip roll X36 and The second nip roll X37 is attached to the surface side of the cap sheet SC. At that time, the liner sheet SL and the cap sheet SC of the bubble board B are joined by the liner sheet laminate film LL supplied from the liner sheet laminate film supply device X34. Further, the backsheet laminate film LB supplied from the backsheet laminate film supply device X35 is stacked on the backsheet SB by pressure bonding with the first nip roll X36 and the second nip roll X37. Through the above steps, a three-layer plastic hollow plate P is mainly formed by bonding a liner sheet SL to a two-layer bubble board B.

  Subsequently, the plastic hollow plate P conveyed to the cooling region X4 is cooled by the air knife X41, and finally cut into a predetermined dimension by the auto cutter X51 in the cutting region X5 to be a finished product.

  Here, the effect | action of the tenter apparatus X21 in the said extending | stretching area | region X2 is explained in full detail.

  As described above, the bubble board B which is conveyed from the first molding region X1 and is in an elastic body state with a uniform temperature distribution is stretched in the widening direction by the tenter device X21 having both edge portions arranged on both sides of the stretching region X2. The As described above, the bubble board B generated in the present embodiment has bubbles up to the side edge or the vicinity thereof.

  Specifically, when the bubble board B reaches the first rotation holding member X211 and the second rotation holding member X212 disposed at the start end of the extending region X2, the edge of the bubble board B is moved to the first time. It is drawn and pinched between the dynamic clamping surface X211a and the second rotation clamping surface X212a. At this time, the plurality of protrusions X211ax provided on the first rotation holding surface X211a mesh with the protrusions of the bubble board B, so that the edge of the bubble board B becomes the first rotation holding surface X211a and the second rotation holding surface. It is smoothly held between X212a and a good holding state is obtained. As shown in FIG. 4, there is a predetermined area between the first rotation holding surface X211a and the second rotation holding surface X212a, including the edge part of the bubble board B where the bubbles are present. It is pinched. The bubble board B, the edge of which is held between the first rotation holding surface X211a and the second rotation holding surface X212a, is conveyed in a direction deflected outward with respect to the center line BL of the board conveyance path, Stretch in the widening direction. Subsequently, the bubble board B reaches the first rotation holding body X211 and the second rotation holding body X212 disposed in the intermediate portion of the extending region X2, and at this time, the first rotation holding surface X211a and the second rotation holding surface X211 The edge portion of the bubble board B is sandwiched between the rotation sandwiching surface X212a and is conveyed again in the direction deflected outward, thereby further extending in the widening direction. Finally, the bubble board B reaches the first rotation holding body X211 and the second rotation holding body X212 disposed at the end portion of the extending region X2, and at this time, the first rotation holding surface X211a and the second rotation holding surface X211 The edge portion is sandwiched between the rotational clamping surface X212a and conveyed in a direction deflected outward, thereby further extending in the widening direction. And, the transport speed between each pair of the first rotary sandwiching body X211 and the second rotary sandwiching body X212 that make a pair is all made constant, or is gradually increased along the transport direction of the bubble board B. Or the 1st rotation clamping body X211 which distribute | arranged the conveyance speed of the 1st rotation clamping body X211 and the 2nd rotation clamping body X212 distribute | arranged to the intermediate part of the extending | stretching area | region X2 to the starting end part and termination | terminus part of the extending | stretching area | region X2. By appropriately selecting a plurality of transport speed patterns such as a speed higher than the transport speed of the second rotary clamping body X212, the stretching pattern (stretching pattern) of the bubble board B in the stretching region X2 can be changed.

  Thus, in the extending | stretching area | region X2, the bubble board B is conveyed along a conveyance direction in the state by which the edge was pinched | interposed between the 1st rotation clamping surface X211a and the 2nd rotation clamping surface X212a. However, it is urged in the widening direction and gradually stretched. Then, the bubble board B is stretched to the maximum when it is sandwiched between the respective rotational clamping surfaces X211a and X212a of the first rotational clamping body X211 and the second rotational clamping body X212 disposed at the end portion of the stretching region X2. In this state, the plastic sheet P having a three-layer structure is formed by bonding the liner sheet SL to the top of the protrusion of the cap sheet SC. That is, in this embodiment, as shown in FIG. 1, the terminal part of the extending | stretching area | region X2 and the start part (1st nip roll X36 and 2nd nip roll X37) of the 2nd shaping | molding area | region X3 overlap. Thereby, liner sheet | seat SL can be bonded together to the bubble board B in the state extended | stretched to the maximum. Thereafter, in a state where the liner sheet SL is bonded to the bubble board B, the bubble board B mechanically stretched by the tenter device X21 is reduced and deformed as the liner sheet SL is cooled and reduced in deformation. Thus, a plastic hollow plate P without warping is formed.

  As described above, the tenter device X21 according to the present embodiment has the rotation clamping surfaces X211a and X212a that rotate at a speed corresponding to the conveyance speed of the bubble board B, and the bubble board B by the rotation clamping surfaces X211a and X212a. A plurality of pairs of rotating holding bodies X211 and X212 that form a pair for holding the edge of the pair of rotating holding bodies X211 and X212 are provided, and the energizing force in the widening direction can be applied to the bubble board B being conveyed. Therefore, the edge of the bubble board B can be pivotally pinched regardless of the presence or absence of bubbles, compared with the conventional mode in which the ear portion of the bubble board, that is, the portion where the bubbles do not exist is held by the clip. A bubble board B that can be smoothly and accurately wound between the rotation holding surfaces X211a and X212a of the bodies X211 and X212, and has bubbles up to the side edge or the vicinity thereof. , It can exert stretching effect reasonably bubble board B by pulling the edge turning clamping face X211a, outward and held between X212a.

  In particular, since the rotary holding bodies X211 and X212 are pinch rolls whose outer peripheral surfaces are the rotary holding faces X211a and X212a, the tenter device X21 can be realized with a simple configuration.

  In addition, since the conveyance direction of the bubble board B by the pair of rotary sandwiching bodies X211 and X212 is deflected outward with respect to the center line BL of the board conveyance path, the bubble board B passing through the extending region X2 is deflected. Can exert an appropriate stretching action.

  Further, of the rotational clamping surfaces X211a and X212a of the rotational clamping bodies X211 and X212 that make a pair, the projections mesh with the first rotational clamping surface X211a that is in contact with the front side surface on which many projections of the bubble board B exist. Since a large number of protrusions X211ax are provided, these protrusions X211ax function as spikes, preventing the pinching state of the bubble board B by the rotation holding members X211 and X212 in the extending region X2 from being unexpectedly released, The bubble board B can be reliably conveyed while being stretched.

  Also, a plurality of pairs of the first rotary holding body X211 and the second rotary holding body X212 that make a pair are arranged in the transfer direction of the bubble board B with an interval, and the transfer speeds of these sets are made different from each other. Therefore, the stretching pattern of the bubble board B can be changed as appropriate in response to various needs, and the versatility is excellent.

  The present invention is not limited to the embodiment described in detail above.

  For example, the tenter device may be one in which the projecting body is not provided on any of the rotational clamping surfaces of the rotational clamping bodies that form a pair. Moreover, in the said embodiment, you may make it arrange | position the rotation clamping body which makes a pair without leaving a space | interval along the conveyance direction of a bubble board.

  Moreover, in the said embodiment, although the arrangement | positioning aspect in which the virtual axis line along the rotation direction of each set of rotation clamping bodies was located on substantially the same straight line was illustrated, at least the said virtual axis line of each set is a board conveyance path. Any arrangement may be employed as long as it is deflected outward with respect to the center line, and each set of virtual axis lines may not be located on substantially the same straight line.

Moreover, you may employ | adopt the rotation clamping body shown to the following modifications as a rotation clamping body which makes a pair.
<Modification>
FIG. 5 and FIG. 6 (FIGS. 6A and 6B) are views schematically showing the X direction arrow view and the Y direction arrow view in FIG. 5, respectively, of the tenter device XA21 according to this modification. ), The first rotation holding body XA211 and the second rotation holding body XA212 that make a pair rotate at a speed corresponding to the conveyance speed of the bubble board B, respectively, This is an endless track having an outer surface with a two-turning clamping surface XA212a, and the edge of the bubble board B is held between the first turning-holding surface XA211a and the second turning-holding surface XA212a.

  As shown in FIG. 6, the first rotation holding body XA211 and the second rotation holding body XA212 circulate between the pair of roll bodies XA211r and XA212r, between the roll bodies XA211r-XA211r, and between the roll bodies XA212r-XA212r, respectively. Belt bodies XA211b and XA212b, and the outer surfaces of the belt bodies XA211b and XA212b function as a first rotation clamping surface XA211a and a second rotation clamping surface XA212a.

  In the present embodiment, the first rotation holding body XA211 is in contact with the front side where the protrusion of the bubble board B exists, that is, the surface on the cap sheet SC side, and the second rotation holding body XA212 is flat on the bubble board B. It is in contact with the back side, that is, the surface on the back sheet SB side. A plurality of needles XA212ax that are shorter than the overall thickness of the bubble board B are provided on the rotation holding surface XA212a of the second rotation holding body XA212.

  On the other hand, the first rotation clamping surface XA211a of the first rotation clamping body XA211 has a flat shape, and the distance between the first rotation clamping surface XA211a and the second rotation clamping surface XA212a is defined as the bubble board B. Is set to be substantially the same as or slightly larger than the overall thickness.

  And as shown in FIG. 5, the conveyance direction of the bubble board B by the 1st rotation clamping body XA211 and the 2nd rotation clamping body XA212 which make a pair is deflected outward with respect to the centerline BL of a board conveyance path. ing. Specifically, the virtual axis XA21L along the rotation direction of the first rotation clamping surface XA211a and the second rotation clamping surface XA212a is inclined outward by a predetermined angle with respect to the center line BL of the board conveyance path. In the present embodiment, in which the tenter devices XA21 are disposed on both sides of the extending region XA2, the virtual axis line XA21L along the rotation direction of the first rotation clamping surface XA211a and the second rotation clamping surface XA212a is board transported. The center line BL of the road is centered around the center line BL so as to have a substantially square shape in plan view.

  In addition, a plurality of pairs of the first rotation holding body XA211 and the second rotation holding body XA212 that make a pair are arranged in a superimposed manner, and the bubble board B that is being transported forms one of the pairs in the extending region XA2. It can be always held between the XA 211 and the second rotation holding body XA212. In the present embodiment, a total of three sets of the first rotation holding body XA211 and the second rotation holding body XA212 are provided in the extending region XA2, and the end of each of the first rotation holding body XA211 and the second rotation holding body XA212. The part overlaps the starting end part of the first rotation holding body XA211 and the second rotation holding body XA212 of the next point.

  The operation of the tenter device XA21 having such a configuration will be described.

  First, the bubble board B, which is conveyed from the first molding region X1 and is in an elastic body state with a uniform temperature distribution, is disposed on the first rotation holding member XA211 and the second rotation holding member XA212 disposed at the start end of the extending region XA2. At the time of arrival, the edge of the bubble board B is drawn and pinched between the first rotation holding surface XA211a and the second rotation holding surface XA212a. The bubble board B, the edge of which is sandwiched between the first rotation clamping surface XA211a and the second rotation clamping surface XA212a, is in the state (clamping state) along the circumferential direction of each rotation clamping surface XA211a, XA212a. Then, it is conveyed in the direction deflected outward with respect to the center line BL of the board conveyance path, and extends in the widening direction. Subsequently, the first rotation holding body XA211 and the second rotation holding body XA212 disposed at the start end of the extending area XA2, and the first rotation holding body XA211 and the second rotation disposed at the intermediate part of the extending area XA2. The bubble board B that has reached the overlapping position with the movable clamping body XA212 is placed on each of the rotational clamping surfaces XA211a and XA212a of the first rotational clamping body XA211 and the second rotational clamping body XA212 disposed in the intermediate portion of the extension region XA2. Is also held in this state (clamped state), and is conveyed in the direction deflected outward with respect to the center line BL of the board conveyance path along the rotation direction of each rotation clamping surface XA211a, XA212a, and further extended in the widening direction To do. Next, the first rotation holding body XA211 and the second rotation holding body XA212 disposed at the intermediate portion of the extending area XA2, and the first rotation holding body XA211 and the second rotation disposed at the terminal end of the extending area XA2. The bubble board B that has reached the overlapping position with the movable clamping body XA212 is placed on each of the rotational clamping surfaces XA211a and XA212a of the first rotational clamping body XA211 and the second rotational clamping body XA212 disposed at the terminal portion of the extending region XA2. Is also held in this state (clamped state), and is conveyed in the direction deflected outward with respect to the center line BL of the board conveyance path along the rotation direction of each rotation clamping surface XA211a, XA212a, and further extended in the widening direction However, when reaching the terminal portions of the first rotating clamp body XA211 and the second rotating clamp body XA212 disposed at the end portions of the extending region XA2, the stretched state is maximized. State, the plastic hollow plate P of a three-layer structure by bonding liner sheets SL on protruding top side of the cap sheet SC.

  As described above, since the rotary holding bodies XA211 and XA212 are endless track belts whose outer surfaces are the rotary holding faces XA211a and XA212a, the aspect in the embodiment, that is, the rotary holding bodies X211 and X212 are pinch rolls. Compared with a certain mode, the contact mode with respect to the bubble board B is a so-called line contact, while the pinch roll is a so-called line contact, so that the endless track body is so-called surface contact, and the pinching area by the rotational clamping surfaces XA211a and XA212a is effectively It is possible to earn and exert a stretching action on the bubble board B efficiently and stably.

  In addition, since a plurality of pairs of rotating sandwiching bodies XA211 and XA212 that are paired are arranged, the bubble board B being conveyed is always sandwiched between the pair of rotating sandwiching bodies XA211 and XA212 in the extending region XA2. It can always be urged outward, avoids shrinkage of the bubble board B being conveyed, and exhibits an appropriate stretching mechanism.

  In particular, among the rotational sandwiching surfaces XA211a and XA212a of the rotational sandwiching bodies XA211 and XA212 that make a pair, the second rotational sandwiching surface XA212a that is in contact with the flat back side surface of the foam board B is more than the overall thickness of the foam board B. In addition, since a plurality of needles XA212ax, which are short projections, are provided so as to project, the needles XA212ax function as spikes, and the air bubble board B being conveyed is unexpectedly released from the holding state by the rotational holding surfaces XA211a and XA212a. This can prevent the problem of being detached.

  In the above-described embodiment and the modification, an example in which three pairs of rotating sandwiching bodies forming a pair are illustrated, but the number of sets may be increased or decreased as appropriate.

  In the embodiment and the modification, the tenter device is illustrated as being disposed on both sides of the board conveyance path. However, an aspect in which the tenter device is disposed only on one side of the board conveyance path may be employed. . In this case, the edge of the bubble board is sandwiched on the other side of the board conveying path where the tenter device is not disposed, and the edge of the bubble board is placed on a predetermined line against the stretching action by the tenter device. It is preferable to arrange a holding device that conveys while holding.

  Further, in the above-described modification, among the rotation holding surfaces of the pair of rotation holding bodies, a large number of protrusions that mesh with the protrusions on the rotation holding surface that contacts the front side surface on which the plurality of protrusions of the bubble board are present. May be provided. On the other hand, in the embodiment described above, a needle shorter than the entire thickness of the bubble board is provided on the rotation holding surface that contacts the flat back surface of the bubble board among the rotation holding surfaces of the pair of rotation holding members. A plurality of protrusions may be provided. Further, the tenter device may be one in which the projecting body and the needle are not provided on any of the rotational clamping surfaces of the rotational clamping bodies that form a pair.

  You may set so that adjustment is possible according to the whole thickness of the bubble board which clamps the separation distance between the rotation clamping surfaces of the rotation clamping body which makes a pair. In this way, it is possible to flexibly cope with various bubble boards having different overall thicknesses.

  In addition, the specific configuration of each part is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

The schematic diagram of the plastic hollow plate molding machine provided with the tenter apparatus which concerns on one Embodiment of this invention. The figure which shows typically the front view of the vacuum forming roll in the embodiment by making a partial cross section. The figure which shows typically the top view of the tenter apparatus which concerns on the same embodiment. The figure which shows typically the rotation clamping body of the tenter apparatus which concerns on the same embodiment. The figure which shows one modification of the tenter apparatus which concerns on the embodiment corresponding to FIG. The figure which shows typically the rotation clamping body of the tenter apparatus which concerns on the modification.

Explanation of symbols

B ... Bubble board X2, XA2 ... Stretching area X21, XA21 ... Tenter device X211, XA211 ... First rotary holding body X212, XA212 ... Second rotary holding body X211a, XA211a ... First rotary holding surface X212a, XA212a ... 2nd rotation clamping surface X211ax ... protrusion XA212ax ... needle

Claims (8)

A tenter device that is disposed on a side of a board conveyance path in which a bubble board is conveyed in a certain direction, and biases an edge of the bubble board being conveyed outward in a predetermined stretching region,
It has a plurality of rotating holding members that have a rotating holding surface that rotates at a speed corresponding to the conveyance speed of the bubble board, and that form a pair that holds the edge of the bubble board on the rotating holding surface. The tenter device is characterized in that the pair of rotary sandwiching bodies are arranged so as to apply an energizing force in the widening direction to the bubble board being conveyed. The tenter device according to claim 1, wherein the rotating holding body is a pinch roll whose outer peripheral surface is the rotating holding surface. The tenter device according to claim 1, wherein the rotating clamping body is an endless track band having an outer surface as the rotating clamping surface. 4. The tenter device according to claim 1, 2, or 3, wherein a conveying direction of the bubble board by the pair of rotating sandwiching bodies is deflected outward with respect to a center line of the board conveying path. A plurality of protrusions that mesh with the protrusions are provided on a rotation holding surface that comes into contact with a surface on the front side where a large number of protrusions of the bubble board are present among the rotation holding surfaces of the pair of rotation holding bodies. Item 10. A tenter device according to item 1, 2, 3 or 4. The tenter device according to claim 2, wherein a plurality of pairs of the pinch rolls forming a pair are arranged at intervals in the conveyance direction of the bubble board, and the conveyance speeds of the respective groups are made different. The tenter device according to claim 3, wherein a plurality of pairs of the endless track bands are arranged so as to be always held between any pair of the endless track bands in the extending region. . A plurality of needles that are shorter than the entire thickness of the bubble board protrude from the rotation clamping surfaces of the rotation clamping bodies that make a pair and that are in contact with the flat back surface of the bubble board. The tenter device according to claim 1, 2, 3, 4, 5, 6 or 7.

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