JPH11179789A - Molding device of synthetic resin sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably and continuously form a synthetic resin sheet-like matter or the like, in which no air is caught and the surface of which is uniform and highly mirror- finished or properly patterned. SOLUTION: A molding mechanism for molding a synthetic resin sheet having the predetermined thickness by rolling and cooling a molten synthetic resin material continuously supplied and charged from a die is equipped with a molding roller 15 rotatably supported on a forming base block 11 and a molding drum 21, which is radially flexible and pinches the molten synthetic resin material M together with the molding roller 15 by abuttingly rotating under the state that some part of the molding roller 15 is dented arcuatedly along the outer peripheral surface of the molding roller 15 so as to mold the molten synthetic resin material M into the predetermined thickness and the remaining part of the section expanding by means of the fluid filled in the molding roller of the molding roller 15 has a nearly circular section. The forming drum 21 is supported by a rotatably supported drum supporting shaft 26 and a drum supporting means 25 equipped with an expandingly supporting bag 31 for fitting the forming drum 21 to the outer periphery of the bag by expanding with a fluid such as a fluid, a gas or the like supplied within itself annexed in corresponding to the drum supporting shaft 26.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin sheet made mainly of synthetic resin, which can be formed continuously, and its surface can be formed into a smooth mirror surface or various patterns.
The present invention relates to an apparatus for molding a synthetic resin sheet that can be used for heat bonding and the like.

[0002]

2. Description of the Related Art Conventionally, a thin sheet made of a synthetic resin is formed by, for example, an extrusion molding apparatus that forms a molten synthetic resin material by rolling it. As an example of this extrusion molding apparatus, a configuration is adopted in which a molten synthetic resin material fed from a die of an extruder is sequentially conveyed through a surface finishing roll, an annealing section, a take-up roll section, a transport section, a edging machine, and the like. Have been. After being formed into a predetermined thickness by this conveyance and cut by a cutting machine, they are appropriately stacked or wound up by a take-up roll (Plastic Processing Technology Handbook, page 225, published by Nikkan Kogyo Shimbun). reference).

[0003] The sheet thickness at the time of molding the sheet,
For example, by adjusting the lip of the die, the method of adjusting the gap between the surface finishing rolls is applied to thick sheets, the touch adjustment of the rubber roll to the forming roll, and the press of the air knife to the forming roll is applied to the thin sheet. The method by adjustment or the like is applied.

On the other hand, as disclosed in JP-A-6-166089 and JP-A-6-170909, a thermoplastic resin is supplied between a casting drum and a metal endless belt.
There is also a casting drum which is cooled while being pressed by a belt abutting in an arc shape on an outer peripheral surface of a cast drum to form a sheet.

[0005]

The air knife method applied to the adjustment of the sheet thickness of a thin sheet, however, has a problem that an air pocket is formed between a molten synthetic resin material and a molding roll to obtain a sheet having a uniform surface. Can be difficult. In addition, the touch roll method is easily damaged because the surface material of the touch roll itself is made of rubber, and the damage mark is transferred to the sheet, the sheet is wrapped around the rubber roll, the temperature of the rubber roll surface rises, and the mirror surface is damaged. The production of a sheet having high performance and a sheet having a sculpture pattern was extremely troublesome.

On the other hand, in the pinching molding method using a cast drum and a metal endless belt, the surface of the belt must be formed into a smooth mirror-finished surface. Special measures and considerations are required, and as a result, the sheet product to be molded is inevitably very expensive as it is very expensive. Not only that, when the endless belt is replaced due to wear, abrasion, etc., due to use, the endless belt itself is long and bulky, and the work time and labor becomes enormous,
It was very troublesome.

Accordingly, the present invention has been made in view of the above-mentioned circumstances that have existed in the prior art, and has no air entrainment during molding, has a uniform surface, and has a high mirror finish. Stable and efficient production of
Moreover, not only does the bending adjustment of the molten synthetic resin material be unnecessary, but it is also easy to handle such as attachment and detachment and replacement, so that a sheet-like material can be provided at a low cost. An object of the present invention is to provide an apparatus for molding a synthetic resin sheet that can be used for heat bonding and bonding.

[0008]

According to the present invention, there is provided an apparatus for forming a synthetic resin sheet having a predetermined thickness by rolling a synthetic resin material by a molding mechanism. The molding mechanism 10 includes a molding roller 15 rotatably supported on a molding base block 11.
In a state in which a part is depressed in an arc shape along the outer peripheral surface of the molding roller 15, the roller rotates in contact with the molding roller 15 and is pressed in the radial direction to mold the synthetic resin material (M) to be supplied. It is provided with a molding drum (sleeve) 21 which is flexible and has a substantially circular cross section in a section expanded by a fluid filled therein. The molding mechanism 10 rolls and cools the molten synthetic resin material M continuously supplied and supplied from the die 3 to set and mold the synthetic resin sheet S having a predetermined thickness, or heats the thermoplastic resin sheet and the film. It can be melted and subjected to embossing,
A thermoplastic resin sheet or film may be heated and melted and subjected to a heat fusion bonding process (lamination process). The molding drum 21 is supported by drum supporting means 25, 35. The drum supporting means 25, 35 are related to the rotatably supported drum supporting shafts 26, 36 and the drum supporting shafts 26, 36. It can be provided with expansion support bladders 31, 41 which are attached and are expanded by a fluid such as liquid or gas supplied to the inside thereof, and the molding drum 21 is fitted on the outer periphery. One drum supporting means 25 is formed by connecting and integrating a left and right shaft portion 26A rotatably supported by a bottomed cylindrical body 26B disposed so as to straddle between the shaft portions 26A. Drum support shaft 26 and left and right shaft portions 26
A between the left and right support plates 27 fixed to each other, an inflatable support sack which covers the support plates 27 in such a manner that the sides are fixed by the fixing plates 28 abutted and fixed on the outer surfaces of the support plates 27 respectively. 31. A fluid supply path 32 for supplying a fluid into the inflatable support sac 31 is formed in at least one of the left and right shaft sections 26A, and a supply port 33 of the fluid supply path 32 is connected to the shaft section 26A.
The opening 3 is formed in the end face of the nozzle, and the spout 3
Reference numeral 4 denotes an appropriate number of openings formed on the side surface of the shaft portion 26A between the left and right bottom plate portions of the bottomed cylindrical body 26A and the support plate 27. The other drum support means 35 surrounds a drum support shaft 36 composed of a single rotatably supported shaft, and peripheral edges of left and right support blocks 37 fixed to respective ends of the drum support shaft 36. And a donut-shaped inflatable support sac 41. The inflatable support sac 41 itself is housed by being fitted into a storage groove 38 formed in the periphery of the support block 37, and is inflated by a fluid such as a gas supplied by an inlet 42 provided in the inflatable support sac 41 itself. When this is done, the molding drum 21 can be supported from inside by partially projecting from the storage groove 38. Further, in the molding drum 21, backup means 60 for resiliently supporting the wall of the molding drum 21 depressed inward from the inside can be provided.
It can be arranged and formed coaxially with the drum supporting shafts 26 and 36 which are shafts. In addition, the backup means 60 is provided on the outer peripheral surface of the backup cylinder 61 rotatably supported on the drum supporting shafts 26 and 36, and a pressing layer portion made of an elastic material which abuts on the inner peripheral side surface of the wall of the molding drum 21 which is depressed inward. 62 can be formed by covering. The fluid to be filled into the molding drum 21 flows from one end of the drum support shafts 26 and 36 to one end side of the molding drum 21 via the inside of the drum support shafts 26 and 36, and the outer peripheral surface of the backup cylinder 61 and the inside of the molding drum 21. After flowing in the gap with the peripheral side surface, it flows into the backup cylinder 61 from the other end side of the backup cylinder 61, and again from one end side of the drum support shafts 26, 36 in the backup cylinder 61 to the inside of the drum support shafts 26, 36. Through the drum support shaft 2
It can be made to flow in, flow, and flow out along the control fluid flow channel 70 flowing out from the other end of the 6, 36.

In the apparatus for molding a synthetic resin sheet according to the present invention, the rotating molding roller 1
The molten synthetic resin material M supplied from the die 3 is placed between the molding roller 5 and a molding drum (sleeve) 21 which is radially flexible and is expanded by a fluid, which rotates along the outer peripheral surface of the molding roller 15. When inserted, these forming rollers 15,
The synthetic resin sheet S having a predetermined thickness is roll-formed by the pressing force between the forming drums 21, and the roll-forming is continuously performed. Further, a thermoplastic resin sheet or film is heated and melted to perform various types of patterning on its surface, and a heat-sealing lamination process is performed to heat and melt the thermoplastic resin sheet and film to cover the surface of a predetermined member. A substantially circular forming drum 21 having a substantially circular cross section that rotates in contact with the rotating forming roller 15 in a state where a part thereof is depressed in an arc shape along the outer peripheral surface of the forming roller 15 is expanded by fluid pressure. Drum support means 25,
By being supported from the inside by the expansion support bladders 31 and 41 in 35, it is expanded in an appropriate tension state and pressed against the outer peripheral surface of the molding roller 15. The pressure contact is caused by the synergistic action of the expansion due to the fluid pressure and the curvature by the outer peripheral surface of the molding roller 15, so that the portion contacting with the outer peripheral surface of the molding roller 15 is depressed and adhered, and the synthetic resin sheet S having a predetermined thickness is roll-molded. Let it. Inflatable support bladder 31 in one drum support means 25
Is that the molding drum 21 is fitted to the outer periphery in a state of covering the entire drum support shaft 26, thereby supporting the inside of the molding drum 21 over almost the entire outer peripheral surface of the expansion support sac 31, and any part of the molding drum 21 However, the molten synthetic resin material M and the like are roll-molded, molded, and heat-bonded together with the molding roller 15 by means of an evenly distributed clamping force. The expansion support sac 41 of the other drum support means 35 is arranged so as to surround the periphery of the support block 37 at the end of the drum support shaft 36, so that a molding drum fitted outside the expansion support sac 41. 21 supported by its ends, combined with the expansion action of the fluid supplied and filled into the forming drum 21,
The molten synthetic resin material M and the like are roll-molded, molded, and heat-bonded together with the molding roller 15 by the dispersed pinching action. Inflatable support sac 3 in drum support means 25, 35
The discharge of the fluid supplied to the inflatable support bladders 31 and 4
1 is reduced in size, the molding drum 21 is pulled out and released, and the attachment / detachment replacement is performed. The backup means 60 resiliently presses and supports the recessed portion of the wall of the molding drum 21 which is recessed along the outer peripheral surface of the molding roller 15 from the inside of the molding drum 21, and press-bonds generated between the molding roller 15 and the molding drum 21. Further stabilizes the force. This backup means 6
0, the rotatable backup cylinder 61 is coaxial with the drum support shafts 26 and 36, and thus stably and smoothly follows the rotation of the molding drum 21. The molding drum 21 is smoothly rotated without causing torsion, distortion, or the like due to a load, and the synthetic resin sheet S having no bank mark or the like is molded. The control fluid flow path 70 allows the fluid filled in the molding drum 21 to flow from one end of the drum support shafts 26, 36 to the other end thereof, to flow therethrough.
When the gas flows out, the constant temperature can be controlled at all times, and when flowing in the gap between the outer peripheral surface of the backup cylinder 61 and the inner peripheral side surface of the forming drum 21, the flow velocity of the fluid is increased in combination with the narrow gap. As a result, the temperature difference between the one end side and the other end side of the molding drum 21 is reduced, and heat exchange inside and outside the wall of the forming drum 21 is efficiently performed.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 shown in the drawings is a movable base frame installed on an appropriate installation surface. An appropriately thick synthetic resin sheet S molded to a predetermined thickness by the molding mechanism 10 is provided on the frame 1.
An annealing part 2 is formed by arranging an appropriate number of annealing rollers in order to cool and mold the roller.

The molding mechanism 10 raises and lowers a die 3 for supplying and feeding a predetermined synthetic resin material M in a molten state, for example, molten polypropylene, polyethylene, etc., so that the distance between the die 3 and the supply section can be adjusted. It is freely provided on the front part of the base frame 1. That is, the molding mechanism 10 includes a molding base block 11 that can move up and down so as to approach or separate from the die 3, and a molding roller 1 rotatably supported on the molding base block 11.
5 and a radial direction in which the molten synthetic resin material M supplied from the die 3 is set and molded to a predetermined thickness while rotating in contact with a part of the outer peripheral surface of the molding roller 15 in an arc shape to squeeze together with the molding roller 15. Forming drum (sleeve) 21 having a substantially circular cross section which is flexible and expanded by a fluid filled therein.
And comprising.

As shown in the drawing, the molded base block 11 is formed with guide means 13 which can be slid up and down on the front side surface of the molded base block 11, and a motor 14 fixedly disposed at the front of the bottom of the molded base block 11. The pair is provided on the left and right sides facing each other so as to be able to move up and down by the driving jack unit 12. Further, the molded base block 11 itself has a substantially L-shape on a side surface having a step where the front portion is high and the rear portion is low when viewed from the side.

The molding roller 15 is rotatably supported between the molding base blocks 11 by bearings provided on the upper surface of a high portion at the front part of the left and right molding base blocks 11, and if necessary, heated inside. , A temperature adjusting mechanism (not shown) for cooling is provided. The molding roller 15 is driven and rotated by being decelerated and rotated by a driving source 16 such as an appropriate motor.

The forming drum (sleeve) 21 itself is formed in a tubular shape having elasticity such that a part thereof is depressed inwardly by an external force along a radial direction such as a thin pipe or a thin sleeve (FIG. 3). , FIG. 9), a mirror-like surface when molding a synthetic resin sheet S having a smooth surface, and an engraving or the like corresponding to the pattern so as to be transferable when molding a synthetic resin sheet S having a pattern. It is formed in the shape of an uneven pattern due to. The molding drum 21 is used for the molding roller 1.
5 is arranged on a slide frame 22 disposed on a lower portion in the rear part of the molded base block 11 so as to be slid forward and backward by adjusting means (50, 55), and set up, down, front and rear intervals. The drum is supported by the drum supporting means 25 supported on the slide frame 22 in a state of being expanded by the expansion pressure applied from inside. The molding drum 21 itself has, for example, a mirror finished outer peripheral surface and a thickness of 200 to 40.
It is formed of nickel having a size of 0 μm and a diameter of about 28 cm. Of course, the thickness, diameter, and further the drum surface length of the molding drum 21 itself are not limited thereto, and the material itself can be made of other metal, synthetic resin, or the like. In some cases, a pattern of concavo-convex pattern for transfer formation is appropriately engraved, and these are appropriately selected and used. In any case, the synthetic resin sheet S having a predetermined thickness is molded by the flexibility of the molding drum 21 itself, the close contact with the molding roller 15 or the set clearance in synchronization with the molding roller 15.

The forming drum 21, also called a sleeve, is manufactured by, for example, an electroforming method. The material and the thickness in the radial direction and the width direction are made into a uniform thin-walled pipe. When a hard chrome plating process is performed and an uneven pattern is formed on the surface, for example, a photoengraving method, a laser beam method, or the like is used. In particular, in the case of laser beam surface processing, the pattern can be processed without damaging the mirror surface, and the process can be simplified and shortened due to direct processing, and the processing cost is low, and the area and depth are low. At the same time, fine processing on the order of microns is possible.

The drum supporting means 25 comprises drum supporting shafts 26 and 36 rotatably supported by bearings 23 arranged and fixed on the left and right slide frames 22.
And expansion support bladders 31, 41 which are associated with the drum support shafts 26, 36, are expanded by a fluid such as liquid or gas supplied to the inside thereof, and the molding drum 21 is fitted on the outer periphery. Be prepared.

One example of a specific drum support means 25 is, for example, as shown in FIGS. 1 to 5, arranged so that the left and right shaft portions 26A supported by the bearings 23 straddle between the shaft portions 26A. There is no hollow drum support shaft 26 integrated by being connected by the bottomed cylindrical body 26B mounted, and between the left and right support plates 27 fixed to the left and right shaft portions 26A, respectively. A donut-shaped or disc-shaped fixing plate 28 that covers each of the inflatable support bladders 31 so as to enclose them and abuts and fixes the side portions of the inflatable support bladders 31 on the outer surface of the support plate 27 is attached via, for example, mounting screws. It is attached. In at least one of the left and right shaft portions 26A, a fluid supply passage 32 for supplying a fluid into the inflatable support sac 31 is formed. The fluid supply passage 32 is provided with a supply port 33 at an end face of the shaft portion 26A. The opening 34 is formed and the spout 34 into the inflatable support sac 31 is provided with a shaft portion 26 between the left and right bottom plate portions of the bottomed cylindrical body 26A and the support plate 27.
An appropriate number of openings are formed on the A side surface. When the fluid is supplied into the inflatable support sac 31, the maximum outer diameter when the inflatable support sac 31 is inflated is not large as compared with the inner diameter of the molding drum 21. 21 is fitted to the inflatable support sac 31
Supports the forming drum 21 from the inside, and when the outer peripheral surface of the forming drum 21 is brought into contact with the outer peripheral surface of the forming roller 15, the outer peripheral surface is resiliently bent along the outer peripheral surface of the forming roller 15.

Another specific drum supporting means 35 is:
As shown in FIG. 6, one solid or hollow shaft supported by the bearing 23 is connected to the drum support shaft 3.
6, the periphery of the left and right support blocks 37 fixed to the respective ends of the drum support shaft 36 is surrounded by a donut-shaped inflatable support bag 41. And inflatable support sac 4
1 itself is a storage groove 38 formed on the periphery of the support block 37.
The inflatable support sac 41 is housed by being fitted into the inside.
When inflated by a fluid such as a gas supplied by an injection port 42 provided therein, a part thereof projects from the storage groove 38 so that the molding drum 21 is
At the end of 1 itself, it is supported from inside. Further, in the molding drum 21 supported by the expansion support sac 41, when the molding drum 21 abuts the molding roller 15 and presses the molten synthetic resin material M, for example, the shape retaining property and the cooling property of the molding drum 21 itself. A fluid such as a gas or a liquid is supplied to maintain the conditions. A fluid supply passage 43 for this purpose is formed at at least one end of the drum support shaft 36, and a supply port 44 is provided at an end surface of the drum support shaft 36 so that the drum support shaft 36 on the inner side of the support block 37 is provided. Appropriate number of spouts 45 on the side
Are formed respectively. Although not shown, the fluid inlet 42 into the inflatable support sac 41 is not formed directly in the inflatable support sac 41 but passes through the end of the drum support shaft 36 and the inside of the support block 37. It is also possible.

Regardless of the drum supporting means 25, 35, the fluid to be supplied and filled into the inflatable supporting bladders 31, 41 and the forming drum 21 itself may be any of gas, liquid, viscous body and the like. In short, the molding drum 21 is pressed against the molding roller 15 so as to strongly adhere to the outer peripheral surface of the molding roller 15, or a slight clearance is set between the molding rollers 15, 24 so that the molten synthetic resin material M is fixed to a predetermined amount. What is necessary is that the forming drum 21 itself be depressed so as to bend inward along the outer peripheral surface of the forming roller 15 so as to be sufficient to form a thick sheet. Further, it is needless to say that the fluid supplied to the inside of the molding drum 21 can exert a cooling function or can be supplied and circulated.

A pressing margin adjusting means 5 for adjusting a pressing force of the outer peripheral surface of the forming roller 15 to the surface of the forming drum 21.
The pressing margin adjusting means 50 slightly slides the slide frame 22 of the forming drum 21 which slides back and forth, and for example, as shown in the figure, a high portion at the front of the forming base block 11. A wedge-shaped clearance cotter 52 interposed between the rear surface of the slide frame 22 and the front surface of the slide frame 22, for example, the bearing 23 is slid left and right or up and down. That is, for example, as shown in FIGS.
(2) The contact surface between the slide block 51 disposed on the partial surface of the bearing 23 as the front surface and the clearance cotter 52 disposed between the front surface of the slide block 51 and the rear surface of the high portion at the front of the molded base block 11 is defined as an inclined surface. In addition, the clearance cotter 52 is connected to an adjustment screw 53 which is moved forward and backward so as to slide the clearance cotter 52 along the left and right or up and down directions on the rear surface of the base block 11. Therefore, the inclined surface of the clearance cotter 52 which is advanced and retracted by the screwing of the adjusting screw 53 moves the slide frame 22 forward and backward through the slide block 51 which comes into contact with the inclined surface.

The left and right slide frames 22 themselves are
Each of them is slid back and forth on the rear part of the molded base block 11 by an advance / retreat adjusting mechanism 55. The advance / retreat adjusting mechanism 55 is provided with the molded base block 11.
The leading end of a cylinder rod of an advance / retreat cylinder 57 fixed to a cylinder stay 56 erected on the rear surface of the slide frame 22 is connected to the rear end face of the slide frame 22. By moving the molding drum 21 back and forth, the pressure of the molding drum 21 on the outer peripheral surface of the molding roller 15 can be adjusted.

The molding drum 21 is provided with a temperature control mechanism (not shown) for heating or cooling the molten synthetic resin material M. Temperature control for the material M is enabled. This temperature adjustment is performed by the inflatable support sac 31,
41, it is also possible to provide a temperature adjusting mechanism (not shown) for heating and cooling inside the forming drum 21 itself.

The molding roller 21 is provided inside the molding drum 21.
5 is provided with a backup means 60 for supporting the wall of the forming drum 21 which is depressed inward by pressing against the inner wall 5 from the inside.
As shown in FIG. 10 to FIG. 10, the drum support shafts 26 and 36 in the molding drum 21 are rotatably arranged coaxially with the molding drum 21. This backup means 60
It is made of an elastic material that is in contact with the outer peripheral surface of a backup cylinder 61 formed in a bottomed cylindrical shape fixed to the drum support shafts 26 and 36 and in contact with the inner peripheral side surface of the wall of the molding drum 21 that is depressed inward. The pressing layer portion 62 is formed by covering.

The backup cylinder 61 is made of a metal material such as an iron material or a SUS material or other rigid materials, and the pressing layer portion 62 itself is made of a rubber, an elastic synthetic resin or another elastic material, and is formed as shown in FIG. When the pressing layer portion 62 comes into contact with the inner peripheral side surface of the molding drum 21 wall and the expansion support bladder 31, which is depressed inward by the pressing contact with the roller 15, and the molding drum 21 wall itself as shown in FIG. The elasticity of the portion 62 itself is sufficiently exhibited. The outer peripheral side surface of the pressing layer portion 62 and the molding drum 21 or the expansion support bag 3
The width of the gap with respect to the inner peripheral side of the molding roller 15 is not so large as compared with the depth of the depression in the wall of the molding drum 21 or the wall of the expansion support sac 31 which is depressed when pressed against the molding roller 15.

The back-up cylinder 61 itself is provided on the drum supporting shafts 26 and 36 via a water-sealing seal bearing 63 so that the back-up means 60 is rotatable in the molding drum 21. The inside and outside of the backup cylinder 61 are water-sealed and rotatably supported. By making the backup cylinder 61 rotatable, the pressing contact with the molding roller 15 passing through the wall of the molding drum 21 is smoothly performed in the molding drum 21, and the synthetic resin sheet S is formed by the concave portion of the rotating molding drum 21. Molding can be continuously and smoothly performed.

The fluid, such as water for cooling and other temperature control, which fills the inside of the molding drum 21 is supplied to the molding drum 2.
1 through the temperature adjusting mechanism, if necessary, so as to appropriately control the temperature in the drum 1, and is supplied from the supply port 74 at one end of the drum support shafts 26 and 36, and is also discharged from the discharge port 75 at the other end. Control fluid flow path 70
Is circulating. That is, as shown in FIG. 7, for example, the control fluid flow passage 70 fixedly supports the molding drum 21 and the expansion support bladder 31 via the fixing plate 28 at both ends of one hollow shaft-shaped drum support shaft 26. A bottomed cylindrical backup cylinder 61 is rotatably supported by a seal bearing 63 at a position inward of the fixed plate 28, and a portion between the fixed plate 28 and the side of the backup cylinder 61 on one end side of the drum support shaft 26. While the inflow hole 71 is opened, the inside of the drum support shaft 26 is shut off at the position of the backup cylinder 61 side, and the flow hole 72 is opened in the backup cylinder 61 side at the other end side of the drum support shaft 26, Further, two rows of outflow holes 73 are provided at one end side of the drum support shaft 26 in the backup cylinder 61.
It is formed by drilling through.

As shown in FIG. 10, for example, at both ends of a hollow shaft-shaped drum support shaft 36, a support block 37 around which an expansion support bag 41 is surrounded is keyed to prevent rotation.
And the support block 3
7, a bottomed cylindrical backup cylinder 61 is rotatably supported by a seal bearing 63 between the support block 37 at one end of the drum support shaft 36 and the side of the backup cylinder 61. While drilling
The inside of the drum support shaft 26 is shut off at the side of the backup cylinder 61, a flow hole 72 is formed in the side of the backup cylinder 61 on the other end side of the drum support shaft 36, and the inside of the backup cylinder 61 in the drum support shaft 36. 2 on one side of
By forming the outflow holes 73 in the row, the control fluid flow path 7
0 is formed.

By forming such a control fluid passage 70, the supply port 74 at one end of the drum support shafts 26, 36 is provided.
The fluid injected into the drum support shafts 26 and 36 from above flows into one end side of the molding drum 21 through the inflow hole 71 and flows in the gap between the outer peripheral surface of the backup cylinder 61 and the inner peripheral side surface of the molding drum 21. Flows into the backup cylinder 61 from the other end of the backup cylinder 61 via the flow hole 72, and from the one end of the drum support shafts 26, 36 in the backup cylinder 61 via the outflow hole 73 again to the drum support shafts 26, 3.
6, the discharge port 7 at the other end of the drum support shafts 26, 36.
5 can be discharged.

Next, a method for molding a synthetic resin sheet S having a predetermined thickness from a predetermined molten synthetic resin material M will be described.
On the other hand, the height of the molding mechanism 10 itself is adjusted by operating the jack unit 13 so as to set the degree of cooling by adjusting the time until insertion, the distance, and the like. Then, when the molten synthetic resin material M supplied from the die 3 is put between the rotating molding roller 15 and the molding drum 21 in the molding mechanism 10, the outer peripheral surface of the molding roller 15 and the outer periphery of the molding roller 15 A rotating forming drum 21 that is partly successively depressed in an arc shape along a surface and pressed.
, And the clamping force accompanied by the addition of resilience by the backup means 60 provided in the molding drum 21, the pressing force and clearance set between the molding roller 15 and the molding drum 21. The synthetic resin sheet S having a predetermined thickness corresponding to the above is molded. Adjustment of the clamping pressure is performed by the fluid supply passages 32 in the inflatable support bladders 31, 41,
The pressure can be adjusted by the filling pressure of various fluids supplied to the control fluid flow path 70 and the like. If necessary, the molding drum 21 is cooled by controlling the temperature of the fluid, and the rolling molding temperature of the synthetic resin sheet S is controlled. .

The adjustment of the pressing force and the clearance at this time is performed by adjusting the feed of the adjusting screw 53 to the clearance cotter 52 in the crimping allowance adjusting means 50 and the pressing strength of the entire forming drum 21 to the forming roller 15 by the advance / retreat adjusting mechanism 55. It is obtained by adjusting the length. The supply unevenness of the molten synthetic resin material M generated between the outer peripheral surface of the molding roller 15 and the molding drum 21 when the molten synthetic resin material M is supplied from the die 3 is different from that of the molding roller 15 by the molding drum means 21 on the left and right sides. It is performed by adjusting the degree of pressure bonding.

The synthetic resin sheet S molded by the molding roller 15 and the molding drum 21 is sent to the annealing section 2 and gradually cooled, and then wound by a predetermined winding roller (not shown). It is cut and stacked to make a product.

Also, the forming drum 2 which has been worn due to use.
1. When replacement with another molding drum 21 having a mirror surface or an irregular pattern is necessary, the fluid supplied to and filled with the expansion support bladders 31 and 41 is discharged so as to bulge the molding drum 21. By doing so, these inflatable support sac 31,4
1 is reduced, so that the molding drum 21 may be detached and replaced in that state.

In the description of the present embodiment, the case of a so-called vertical extrusion system in which the molten synthetic resin material M is injected from the die 3 in the vertical direction has been described. In a so-called horizontal extrusion system, the present invention can be similarly implemented.

Although not shown, when the synthetic resin sheet S is molded while being pressed between the molding roller 15 and the molding drum 21 in the molding mechanism 10, the displacement of the synthetic resin sheet S that occurs during the conveyance is reduced. In order to perform the correction, for example, the forming drum 21 itself may be tilted and rocked with respect to the transport direction. Specifically, the forming drum 2
A moving means for moving one of the left and right bearings 23 supporting the bearing 1 in, for example, the same direction as the transport direction, for example, a worm that rotates a jack shaft in a jack structure by a nut body connected to the bearing 23; The rotation is performed via a means, and the amount of rotation is controlled in accordance with the detected amount of displacement.

Further, although specific illustration examples and detailed explanations are omitted, the surface of the molding roller 15, the molding drum 21 and the like in the molding mechanism 10 is subjected to a processing for forming an appropriate pattern, and is subjected to heat. It is also possible to unwind and heat and melt a plastic resin sheet, a film or the like, and to perform a molding process (embossing process) for applying various patterns thereto. Similarly, a thermoplastic resin sheet, film or the like may be unwound, heated and melted, and subjected to a heat-sealing lamination process (laminating process) in which the surface of a predetermined member is adhered and covered. It is possible.

[0036]

The present invention is configured as described above.
A molding roller 15; a molding drum 21 having a substantially circular cross section, which is expanded in a radial direction and is expanded by a fluid filled therein, which is pressed against the outer peripheral surface of the molding roller 15 and rotated;
Since the molding is performed by the adjusted pressing force between the above, there is no entrainment of air at the time of molding, and the synthetic resin sheet S having a predetermined thickness can be formed only by adjusting the pressing force.
The molded surface is uniform and has high specularity, or it can form an appropriate pattern. It can be stably and continuously molded. Further, it can be molded on thermoplastic resin sheets and films, etc. And so on.

The molding mechanism 10 has a molding roller 15 rotatably supported on a molding base block 11 and a part of the outer periphery of the molding roller 15 against the fluid pressure filled therein. The synthetic resin material (M) is rotated by abutting and rotating together with the molding roller 15 while being sequentially depressed in an arc shape.
And the like, so that the molten synthetic resin material M or the like which is continuously supplied is continuously roll-molded to a predetermined thickness, or a thermoplastic resin sheet or film is molded. It can be fused and bonded. In particular, since the forming drum 21 itself is made of a thin-walled pipe, it is easy to abut this on the outer circumferential surface of the forming roll 15, and the outer circumferential surface along the circumferential direction is smooth and mirror-finished due to the characteristics of the pipe. In comparison with the conventional belt structure, there is no seam as a connecting portion. The molding drum 21
Since the resin sheet itself is extremely inexpensive, the synthetic resin sheet S to be molded is also extremely inexpensive, and since it is lightweight, it is easy to attach and detach and replace it, and it is extremely easy to handle on site.

Further, the peripheral surface of the molding drum 21 is depressed and closely adhered to the outer peripheral surface of the molding roller 15 due to the synergistic effect of the expansion force of the fluid filled therein and the curvature of the outer peripheral surface of the molding roller 15. The molding roller 15
Automatic flexibility of the forming drum 21 with respect to the outer peripheral surface can be obtained, and the forming drum 2
Combined with the fact that the members 1 face each other with the crimping force along the arc shape, the molding distance is substantially elongated, and a reliable molding operation with high accuracy can be exhibited.

One drum supporting means 25 includes a hollow drum supporting shaft 26 in which a bottomed cylindrical body 26B is connected to and integrated with left and right shaft portions 26A, and left and right support plates fixed to the left and right shaft portions 26A, respectively. 27, each of which has a side portion fixed between the support plates 27 so as to enclose and support each of the support plates 27.
Is used to support the molding drum 21 from the inside in substantially the entire area of the outer peripheral surface thereof, and the molten synthetic resin material M is rolled together with the molding roller 15 together with the molding roller 15 by an evenly distributed pinching action in any part of the molding drum 21. Can be molded.

Further, since the side portions of the inflatable support bladder 31 are fixed by the fixing plates 28 abutting and fixed on the outer surfaces of the support plate 27, the inflatable support bladder 31 in a state where the fluid is supplied and filled.
Does not unnecessarily bulge at the side even when the support plate 27 is included, and together with the fact that the fluid does not leak, only the side peripheral surface is bulged to firmly support the molding drum 21 from the inside, This ensures that the roller abuts against the molding roller 15.

The other one of the drum support means 35 is provided with left and right support blocks 3 fixed to respective ends of a drum support shaft 36.
7 is surrounded by a donut-shaped inflatable support sac 41, so that the molding drum 21 fitted outside the inflatable support sac 41 is firmly supported by the ends, and
The molten synthetic resin material M can be roll-molded together with the molding roller 15 by an average and dispersed clamping action together with the expansion action of the fluid supplied and filled into the inside 1.

Moreover, since the fluid filled in the molding drum 21 is expanded, the inside of the molding drum 21 is sealed by the respective expansion support bladders 41 which are in close contact with the inner peripheral surface of the end of the molding drum 21. This prevents the molding drum 21 from swelling out by the filling pressure and abuts against the molding roller 15 in a pressed state. Further, since the inflated support bladder 41 itself is housed in the accommodating groove 38 formed in the periphery of the support block 37 provided at the end of the drum support shaft 36, it is not possible to remove the inflated support bag 41 from the support block 37. Instead, the molding drum 21 is firmly supported from the inside.

Since the expansion support bladders 31 and 41 of the drum support means 25 and 35 are supplied with fluid, the expanded support bladders 31 and 41 can be reduced by discharging the supplied fluid. The expansion support bladders 31, 41 and the like can be easily attached and detached. For this reason, for example, it is possible to easily replace a worn one or a mirrored or irregular one with use, and the handling is extremely easy.

The backup means 6 is provided in the forming drum 21.
0, the molding means 21 is depressed by the backup means 60 along the outer peripheral surface of the molding roller 15.
The concave portion of the wall can be elastically pressed and supported from the inside of the molding drum 21, and the pressing force generated by the pressure generated between the molding roller 15 and the molding drum 21 can be further stabilized.

The backup cylinder 61 of the backup means 60 is rotatable so that the drum support shaft 2 can be rotated.
6 and 36 are coaxial with and supported by the drum support shafts 26 and 36, so that the molding drum 21 is smoothly and stably driven by the rotation of the molding drum 21. This prevents twisting, distortion, and the like from occurring, and allows the molding drum 21 to rotate smoothly so that the synthetic resin sheet S without bank marks or the like can be molded.
In particular, since the backup cylinder 61 and the drum supporting shafts 26 and 36 are coaxial, when the backup cylinder 61 abuts the inner peripheral side surface of the wall of the molding drum 21 against the molding drum 21 recessed inward, the molding roller The pressing action from 15 is supported by the rotating drum support shafts 26 and 36 as a whole, so that no bias, support deformation, bending distortion, etc. occur.

Further, the control fluid passage 70 is
The fluid filled therein flows from one end of the drum support shafts 26 and 36 to the other end thereof, and flows out of the gap between the outer peripheral surface of the backup cylinder 61 and the inner peripheral side surface of the forming drum 21. Therefore, by increasing the flow velocity of the fluid, the temperature difference between the one end side and the other end side of the molding drum 21 can be reduced, so that the fluid in the gap can always be controlled at a constant temperature, The heat exchange inside and outside the wall can be efficiently performed.

In addition, even when used for a long time, no fluid leaks out of the molding drum 21 and the structure is simple, so that maintenance is easy.

[Brief description of the drawings]

FIG. 1 is a partially cutaway plan view according to an embodiment of the present invention.

FIG. 2 is a partially cutaway side view.

FIG. 3 is a partially cutaway side view of the main part.

FIG. 4 is a plan sectional view of the same drum supporting means.

FIG. 5 is an enlarged plan sectional view of a main part of the same.

FIG. 6 is a plan sectional view of another drum supporting means.

FIG. 7 is a plan sectional view similarly incorporating a backup means.

FIG. 8 is an enlarged plan sectional view of a main part of the same.

FIG. 9 is a side sectional view of a main part of the same.

FIG. 10 is a plan sectional view of another backup means.

[Explanation of symbols]

M: Molten synthetic resin material S: Synthetic resin sheet 1 ... Base frame 2 ... Annealing part 3 ... Die 10 ... Molding mechanism 11 ... Molded base block 12 ... Jack part 13 ... Guide means 14 ... Motor 15 ... Molding roller 16 ... Drive source DESCRIPTION OF SYMBOLS 21 ... Drum 22 ... Slide frame 23 ... Bearing 25 ... Drum support means 26 ... Drum support shaft 26A ... Shaft part 26B ... Bottom cylindrical body 27 ... Support plate 28 ... Fixing plate 31 ... Inflatable support sac 32 ... Fluid supply path 33 ... Supply port 34 ... Squirt port 35 ... Drum support means 36 ... Drum support shaft 37 ... Support block 38 ... Storage groove 39 ... Detent key 41 ... Expansion support sac 42 ... Injection port 43 ... Fluid supply path 44 ... Supply port 45 ... Squirt port 50 ... Crimping allowance adjusting means 51 ... Slide block 52 ... Clearance cotter 53 ... Adjustment screw 55 ... Advancing / retreat adjusting mechanism 5 Reference Signs List 6 ... Cylinder stay 57 ... Advancing / retracting cylinder 58 ... Advancing / retreating guide means 60 ... Backup means 61 ... Backup cylinder 62 ... Pressing layer section 63 ... Seal bearing 70 ... Control fluid flow path 71 ... Inflow hole 72 ... Flow hole 73 ... Outflow hole 74 ... Supply port 75… Discharge port

Claims (13)

[Claims] An apparatus for molding a synthetic resin sheet having a predetermined thickness by rolling a synthetic resin material by a molding mechanism, the molding mechanism comprising a molding roller rotatably supported on a molding base block. A part of the molding roller is pressed along with the molding roller in a state of being depressed in an arc shape along the outer peripheral surface of the molding roller, and is pressed radially together with the molding roller to be radially flexible for molding the synthetic resin material to be supplied. An apparatus for molding a synthetic resin sheet, comprising: a molding drum having a substantially circular cross section inflated by a filled fluid. 2. The synthetic resin sheet according to claim 1, wherein the molding mechanism rolls and cools the molten synthetic resin material continuously supplied from a die to form a synthetic resin sheet having a predetermined thickness. Molding equipment. 3. The synthetic resin sheet molding apparatus according to claim 1, wherein the molding mechanism heats and melts the thermoplastic resin sheet and the film and performs a molding process. 4. The synthetic resin sheet molding apparatus according to claim 1, wherein the molding mechanism heats and melts the thermoplastic resin sheet and the film, and performs a heat fusion bonding process. 5. The molding drum is supported by drum support means, which is rotatably supported on a drum support shaft and which is associated with the drum support shaft and which is internally provided therein. The molding apparatus for a synthetic resin sheet according to any one of claims 1 to 4, further comprising an expansion support bladder that is expanded by a fluid such as a supplied liquid or gas and the molding drum is fitted on the outer periphery. 6. The drum supporting means is a hollow body formed by connecting and integrating left and right shaft portions rotatably supported by a bottomed cylindrical body disposed so as to straddle between the shaft portions. Between the drum support shaft and the left and right support plates fixed to the left and right shaft portions, the side portions are fixed by the fixing plates abutting and fixed on the outer surfaces of the support plates so that the support plates are included. 6. An apparatus for molding a synthetic resin sheet according to claim 5, further comprising: an inflatable support bladder for covering. 7. A fluid supply passage for supplying a fluid into the inflatable support sac is formed in at least one of the right and left shaft portions, and a supply port of the fluid supply passage is formed in an end face of the shaft portion. 7. The molding of the synthetic resin sheet according to claim 6, wherein the spouts into the inflatable support sac are formed with an appropriate number of openings on the side surfaces of the shaft portion between the left and right bottom plate portions and the support plate in the bottomed cylindrical body. apparatus. 8. A drum supporting means, comprising: a drum supporting shaft composed of a single rotatably supported shaft; and a donut shape surrounding the peripheral edges of left and right supporting blocks fixed to respective ends of the drum supporting shaft. 6. An apparatus for molding a synthetic resin sheet according to claim 5, comprising an inflatable support bag. 9. The inflatable support bag itself is housed by being fitted into a housing groove formed on the periphery of the support block,
9. The molding drum is supported from the inside by being partially protruded from the storage groove when inflated by a fluid such as gas supplied by an injection port provided in the inflatable support bag itself. Synthetic resin sheet molding equipment. 10. The molding of a synthetic resin sheet according to claim 1, wherein a back-up means for resiliently supporting a molding drum wall which is depressed inward from inside is provided in the molding drum. apparatus. 11. The synthetic resin sheet molding apparatus according to claim 1, wherein the backup means is formed coaxially with the drum support shaft. 12. The backup means comprises a pressing layer made of an elastic material, which is in contact with an outer peripheral surface of a backup cylinder rotatably supported on a drum support shaft of the molding drum, and which is in contact with an inner peripheral side surface of a molding drum wall portion which is depressed inward. The synthetic resin sheet molding device according to any one of claims 1 to 11, wherein the portion is formed by covering. 13. A fluid filled in the molding drum flows from one end of the drum support shaft to one end side of the molding drum through the inside of the drum support shaft, and a gap between an outer peripheral surface of the backup cylinder and an inner peripheral side surface of the molding drum. After flowing through the inside of the backup cylinder, the control fluid flows into the backup cylinder from the other end of the backup cylinder, and flows out of the other end of the drum support shaft through the inside of the drum support shaft again from one end of the drum support shaft in the backup cylinder. The synthetic resin sheet molding device according to any one of claims 10 to 12, wherein the device is formed so as to flow, flow, and flow out along a flow path.