JPH0767695B2 - Method and apparatus for cutting surface layer of laminated plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a plurality of layers including a synthetic resin base material layer and a surface layer made of a material different from the base material layer laminated on the base material layer. A method and apparatus for cutting a surface layer of a laminated plate capable of recovering a base material layer as a single material by cutting the surface layer from the laminated plate, which is particularly suitable for recycling corrugated laminated plates Is.

(B) Conventional Technology Conventionally, a synthetic resin laminated plate (laminated product) having a plurality of layers of this type is generally manufactured by laminating synthetic resins of different materials. At the time of manufacturing, both ends are usually trimmed in the longitudinal direction by a blade (both ends are cut into strips) in order to finish the laminated plate to a width of a specified dimension. This trimming may be performed in order to secure the specified dimension of the laminated plate when the laminated plate meanders when the laminated plate is picked up.

(C) Problems to be Solved by the Invention The strip-shaped both ends cut by the above trimming are
It has been cut into short pieces and discarded, or it has been wound up and discarded as is. However, if both ends are composed of a single layer, make crushed chips with a crusher or shape into pellets with an extruder, and use this for circulation as a recycled raw material or by adding a small amount to a new raw material and circulating it. However, when both ends are composed of resins of different materials, the properties of each resin (melting point, specific gravity, processing characteristics such as viscosity with respect to temperature) are different, so both ends cut There is a problem that even if an expensive resin base material is included in the part, it cannot be reused, and in particular, in the corrugated laminate, the recycling treatment is extremely difficult. As a method for solving this problem, (1) a method of mixing a small amount of recycled raw material with a new raw material of a colored injection-molded article and reusing it has been considered. However, in this method, for example, when a small amount of a regenerated raw material of a polycarbonate resin and an acrylic resin is mixed with an acrylic new resin, the kneading of both resins becomes insufficient, resulting in color unevenness, a decrease in surface gloss and smoothness. Poorly, there was a problem in terms of strength such as cracking between different materials. As a result, the quality was remarkably deteriorated as compared with the case where 100% of the new raw material was used, and particularly the workability was deteriorated.

As the method (2) using a solvent, aromatic hydrocarbons such as acetone, benzene, toluene and xylene, or chlorinated hydrocarbons such as cyclohexanone, acetic ester, tetrahydrofuran, carbon tetrachloride and trichlorethylene are used. A method of chemically separating the surface layers at both ends was also tried. However, in this method, when a laminate other than a polycarbonate resin or an acrylic resin, carbon tetrachloride, or a solvent other than trichloroethylene is allowed to act on the resin, the resin swells violently and separation is impossible. Even when carbon tetrachloride or trichloroethylene was used, the surface layer could not be separated in a short time. Furthermore, even if a solvent other than this is used, the working environment deteriorates due to the use of the solvent. Safety is reduced. It becomes difficult to handle. There were various problems such as the cost of the equipment for collecting the used solvent, and it was practically difficult.

The present invention has been made in view of the above circumstances, and in particular, provides a new laminated board cutting method and apparatus using cutting suitable for the reproduction of corrugated laminated boards.

(D) Means for Solving the Problem In the method for cutting a laminated board of the first invention, a molten thermoplastic resin is extrusion-molded to produce a thermoplastic resin base layer, and the thermoplastic resin base layer is formed into the thermoplastic resin base layer. A supporting roll for supporting the corrugated piece from the bottom side, which is arranged inline with the extrusion molding and cutting step, and which is formed by cutting a corrugated laminated plate in which surface layers made of different materials are laminated. And the pressure roll that presses the corrugated piece from the front side in a close contact state, the corrugated piece can be adjusted to a flat plate shape before being cured, and then the surface layer of the corrugated piece can be adjusted in distance from the corrugated piece. It is characterized in that the base material layer is left from the corrugated piece by cutting and removing with a simple cutting blade.

Further, a cutting device for a laminated plate of the second invention is a device for carrying out the method of the first invention, and is composed of an extruder and a thermoplastic resin base material layer formed by the extruder, which are made of different materials. A blade for cutting a corrugated laminated plate in which surface layers are laminated, a support roll supporting the bottom side of the obtained corrugated piece in the lateral direction, and the corrugated piece provided in parallel with the support roll. A pressing roll for pressing and correcting into a flat plate shape, a take-out means for taking out the corrugated piece sandwiched between the pressing roll and the supporting roll, and provided on the side of the corrugated piece taking-off side slightly apart from the supporting roll, at least A cutting blade for cutting the corrugated one surface layer and a cutting depth adjusting device for adjusting the distance between the cutting blade and the supporting roll, and the supporting roll and the pressing roll are arranged inline with the extruder and the cutting tool. Waves after extrusion It is characterized in that can be corrected in a plate shape in a state before curing the Jo piece.

In-line in the present invention means arranging each process or member so that one process can be continuously transferred to another process without delay.

1st and 2nd invention WHEREIN: The synthetic resin base material layer and surface layer which comprise a laminated board are concretely the combination of polycarbonate resin and acrylic resin, or the combination of vinyl chloride resin and polyethylene terephthalate resin, or vinyl chloride. Examples of the surface layer include a resin and an acrylic resin, but the surface layer is not limited to a synthetic resin, and may be a metal thin film or a plurality of layers. Further, the cutting blade is preferably composed of a milling cutter,
It can also be configured with a grinder.

(E) Function According to the present invention, first, the molten thermoplastic resin is extrusion-molded to produce the thermoplastic resin base layer. Next, after manufacturing a corrugated laminated plate in which a surface layer made of a different material is laminated on the thermoplastic resin substrate layer, the corrugated piece obtained by cutting the laminated plate is used as a supporting roll and a pressing roll. To insert. At this time, since the supporting roll and the pressing roll are arranged in-line with the extrusion molding and cutting process, the corrugated piece is straightened in a heated state in the extrusion molding before being cured. The cutting blade then acts to cut the smooth surface layer, removing the surface layer from the laminate and leaving only the substrate layer.

(F) Embodiments The method and apparatus of the present invention will be described in detail based on the embodiments shown in FIGS. The present invention is not limited to this. Further, in this example, a method of cutting a laminated plate including a polycarbonate base layer and an acrylic resin surface layer will be described.

FIG. 1 is a configuration diagram showing a configuration of a laminated plate take-up machine. In the figure, a 0.95 mm base material sheet A, which is a polycarbonate resin melted through an extruder 1 and a die 2, is clamped by an interruption roll 3a and a lower roll 3b, which are metal cooling rolls, and a 0.05 mm acrylic resin laminating film (Hereinafter referred to as a laminating film) B is heat-fused at the same time, and the laminated sheet C is formed by the first take-up rubber roll 4 via the upper roll 3c.
And then corrugated with a metal molding roll 5 to obtain a corrugated laminated plate D. The corrugated laminated plate D is further taken up by the second take-up rubber roll 7. Then, the wavy laminated plate D is passed through two knife-shaped blades 6 provided in parallel with the traveling direction of the wavy laminated plate D, and both ends in the longitudinal direction thereof are cut. For example, the corrugated laminate D having a width of 700 mm is processed (see FIG. 2). The width of the corrugated strip E obtained by cutting at this time is 25 to 35 mm, respectively (see FIG. 3). It should be noted that 8a and 8b in FIG. 1 are upper and lower blades for cutting the corrugated laminated plate D into a predetermined length to obtain a product.

The corrugated strip E and the corrugated laminated plate D have the sectional structure shown in FIG. 4 before corrugation, and the sectional structure shown in FIG. 5 after corrugation. That is, since the flat laminated plate C is stretched and corrugated by the shaping roll 5, the wave crests 10a and troughs 10b are almost kept at a predetermined thickness, but the slanted part 10c is thin. Molded. According to the above process, the peak portion 10a and the valley portion 10b are each about 1.0 mm, and the inclined portion 10c is 0.8 to 0.9 m.
molded into m.

The corrugated strip E thus obtained is then introduced into the cutting device shown in FIGS. 6a and 6b.

FIG. 6a is a side view of the cutting device. In FIG. 6a, the corrugated strip E is pressed by the cylinder shaft 22b that slides and moves by the air cylinder 22a, so that the upper stage pressing roll 20 as a pressing roll and the supporting roll as a supporting roll. The corrugated shape of the corrugated strip E is clamped by the middle roll 21, and thus the corrugated shape of the corrugated strip E is cold wave-pressed into a flat strip F.

The upper pressing roll 20 has a cylindrical shape with a diameter of 100 mm and is made of synthetic rubber. The axial length is preferably 100 to 300 mm. The linear pressure of the upper pressing roll 20 is preferably 50 to 100 Kg / cm.

The middle roll 21 is made of metal having a diameter of 100 mm. Its axial length may be slightly longer than that of the upper pressing roll 21.

The reason why cold wave pressing is performed is to obtain a state suitable for cutting, and if it is in a heated state, cutting performance deteriorates due to stickiness.

23 is a milling cutter as a cutting blade, which is provided on the take-up side of the flat strip F and slightly apart from the interrupting roll 21, and cuts at least the surface layer of the flat strip F.

In such a configuration, the flat plate strip F has the middle roll 21
The portion of the laminated film B as the surface layer is scraped off by the rotation of the milling cutter 23 arranged so as to face the. Cutting is performed with reference to the inclined portion 10c shown in FIG. That is, the cutting allowance is adjusted to such an extent that the laminated film B does not remain on the base material sheet A after the laminated film B is scraped off. Adjust the cutting allowance by adjusting the middle roll
It is carried out by rotating the middle roll backward pulling handle 24 as a cutting depth adjusting device provided in 21 to adjust the gap G between the milling cutter 23 and the middle roll 21. As a result, the portions which were the peaks 10a and the valleys 10b before the cold wave pressing are slightly scraped off to the base material sheet A. Note that H indicates the position of the middle roll 21 when the corrugated strip E is first set.

Reference numeral 25 denotes a lower pressing roll as a take-up means, which is 1 to 2% larger than the diameter of the middle roll 21 and has a diameter of 101 m.
It is made of synthetic rubber of m, and by increasing the peripheral speed per one rotation, the flat plate strip F is made to be slightly in tension, and the flat strip F is brought into close contact with the intermediate roll 21. This makes it possible to stabilize the cutting allowance of the milling cutter 23. Further, the lower pressing roll 25 is a cylinder shaft 26 of the air cylinder 26.
It is pressed by the middle roll 21 via b. Lower pressure roll 2
The axial length of 5 may be the same as that of the upper pressing roll, and the linear pressure is preferably set to 50 to 100 Kg / cm.

Further, by disposing a second milling cutter (not shown) so as to face the lower pressing roll 25, it is possible to simultaneously cut the laminated film laminated on the back surface of the wavy strip. That is, the surface layers can be respectively cut and removed from the laminated plate in which the laminated films are laminated on both surfaces of the base material sheet.

In FIG. 6A, the corrugated strip E is configured to enter from the upper pressure roll 20 and the middle roll 21 and be withdrawn from the lower roll 25.
The same effect as described above can be obtained even if it is configured such that it enters from 25 and is pulled out from the upper pressing roll 20. Further, the speed of pulling the flat strip F from the lower pressing roll 25 is preferably 3 to 8 m / min.

FIG. 6b is a front view of the cutting device. As shown in the figure, the upper pressing roll 20 is supported by the upper bearing frame 29 and attached to the cylinder shaft 22b, and the lower pressing roll 25 is supported by the lower bearing frame 30 and attached to the cylinder shaft 26b. ing. The milling cutter 23 is attached to a shaft 32 which is pivotally supported by the main body frame 31. A disk-shaped partition plate 23b is provided at the center of the milling cutter 23 in the axial direction. The partition plate 23b functions to guide the two wavy strips E cut by trimming.

27 is 0.75 for driving the milling cutter 23.
The kW electric motor, 28 is a drive belt connecting the electric motor 27 and the milling cutter 23.

In this embodiment, the in-line method in which the corrugated strips E produced by the laminated plate take-up machine are simultaneously subjected to the cutting and peeling treatment as they are is described.
It is also possible to use an outline method in which the material is wound on a roll and then cut.

At the time of cutting, it is desirable to use a blower (not shown) to suck the cutting dust scattered from the milling cutter 23.

When the thickness of the corrugated strip E is 2 to 3 mm, the corrugated strip E is heated and embossed before being supplied to the cutting device.
The laminating film B can be cut by proceeding in the order of the cold process.

Next, the results of cutting processing using this cutting device will be described.

(1) Using a laminated plate take-up machine shown in FIG. 1, a pure transparent polycarbonate corrugated plate (0.05 mm acrylic film is laminated) P having a corrugated pitch of 32 mm is molded, and the corrugated strip obtained by trimming is used as a cutting device. Supply, pulling speed 5.0m / min,
The milling cutter 23 was cut at a rotation speed of 1600 rpm, and crushed chips of 3 to 5 mm were obtained with a commercially available crusher.

(2) The crushed waste obtained in (1) above was mixed with a new polycarbonate resin in an amount of 10 wt /%, and a pure transparent polycarbonate corrugated sheet (0.05 mm acrylic film laminate) P ₁ was obtained by the molding method of (1) again. .

Physical properties of the samples P and P ₁ thus obtained were measured and compared by JIS A5702 “Hard vinyl chloride corrugated plate test method” and JIS K6745 “Hard vinyl chloride corrugated plate test method”. Table 1 shows the comparison result.

As shown in Table 1, it was found that the physical properties of P and P ₁ were almost the same.

(3) Further, a hard vinyl chloride resin is mixed with a predetermined stabilizer and a lubricant to form a base sheet, and a polyethylene terephthalate (P) having a thickness of 0.025 mm is formed by a laminated plate take-off machine shown in FIG.
ET) films were laminated to obtain a semi-transparent hard vinyl chloride resin corrugated plate (thickness 0.9 mm, wave pitch 32 mm) Q. The strip-shaped piece (35mm on one side) obtained by trimming with the same device is supplied to the cutting device, cut at a take-up speed of 3.0 m / min and a milling cutter rotation speed of 1200 r.pm, and then cut with a commercially available crusher. ~ 2 mm of crushed scrap was obtained.

(4) The pulverized scrap obtained in (3) above was mixed with a new vinyl chloride resin powder at 15 wt /%, and a semitransparent hard vinyl chloride corrugated plate Q ₁ was obtained by the same method as in (3). Similar to the comparison test conducted in (2), the physical properties of Q and Q ₁ were compared, but almost no difference was observed. In this embodiment, the cutting process of the strips cut by trimming has been described, but the upper stage pressing roll 20, the middle stage roll 21, the milling cutter 23 and the lower stage pressing roll 25 shown in FIGS.
When the axial length of the flat laminate C corresponds to the width of the flat laminate C, even if a defect occurs in the flat laminate C itself, the flat laminate C can be used as a surface layer of the laminate film B. Needless to say, can be removed by cutting. Further, as described above, in the wavy strip E output from the laminated plate take-out machine shown in FIG. 1, the laminating film B is located on the lower surface side of the base material sheet A. Therefore, when using the take-up machine having such a structure, the corrugated strip E output from the take-up machine is twisted by 180 °, that is, the laminating film B is positioned on the upper surface side of the base sheet A. After that, it is guided to the cutting device shown in FIG.

FIG. 1 (a) shows a take-up machine having a structure in which a laminating film B ₁ is laminated on the upper surface side of a base material sheet A. According to this configuration, the laminating film B ₁ of the wavy strip E output from the take-up machine is located on the upper surface side of the base material sheet A. Therefore, when using the take-up machine having such a structure, the corrugated strip E output from the take-up machine can be guided to the cutting device in that state. If the object to be cut is wide, the construction of the take-up machine shown in FIG. 1 (a) is advantageous. In addition,
In FIG. 1A, the configuration other than the arrangement of the laminating film B ₁ is the same as that in FIG.

(G) Effect of the Invention According to the present invention, after the corrugated laminated plate in which different materials are laminated is once corrected to a flat plate shape, the surface layer which is one of the resin layers can be removed by cutting. The other resin can be left as a single layer. Therefore, the resin after cutting can be recovered and reused, and when the other resin is an expensive material, the cost can be reduced by reusing the resin. In addition, the possibility of reuse can reduce the generation of waste that causes environmental pollution.

[Brief description of drawings]

FIG. 1 is a structural diagram of a laminated plate take-up device for molding a laminated plate to be supplied to a cutting device of the present invention, FIG. 1 (a) is a structural diagram showing another constitution of the laminated plate take-up device, and FIG. FIG. 3 is a perspective view for explaining the trimming of the embodiment of the present invention, and FIG.
Fig. 4 is a perspective view showing the details of the corrugated strip shown in Fig. 4, Fig. 4 is a sectional view showing the section of the laminated plate before corrugation, and Fig. 5 is a sectional view showing the section of the laminated plate also corrugated. 6A and 6B are a side view and a front view showing the configuration of a cutting device according to an embodiment of the present invention. A ... Base material layer, B ... Surface layer, C ... Laminated plate, 20 ... Press roll, 21 ... Support roll, 23 ... Cutting blade, 24 ... Middle roll retracting handle (cutting depth adjustment) Device), 25 ... Collection means.

Claims (2)

[Claims] 1. A thermoplastic resin substrate layer is manufactured by extrusion-molding a molten thermoplastic resin, and a corrugated laminated plate in which a surface layer made of a different material is laminated on the thermoplastic resin substrate layer is cut. The corrugated piece obtained as a result, a support roll that is arranged inline with the extrusion molding and cutting process, and that supports the corrugated piece from the bottom side and a pressing roll that presses the corrugated piece from the surface side in a close contact state. After correcting the corrugated piece into a flat plate in a state before curing, the corrugated piece is removed from the corrugated piece by cutting and removing the surface layer of the corrugated piece with a cutting blade capable of adjusting the distance between the corrugated piece and the corrugated piece. A method for cutting a surface layer of a laminated plate, characterized by leaving a material layer. 2. An extruder, a blade for cutting a corrugated laminate obtained by laminating a surface layer made of a different material on a thermoplastic resin substrate layer formed by the extruder, and a bottom surface of the corrugated piece obtained. A support roll supporting the side in the lateral direction, a pressure roll provided in parallel with the support roll for pressing the corrugated piece to correct it into a flat plate, and sandwiched between the pressure roll and the support roll. A pick-up means for picking up the corrugated piece, a cutting blade provided on the side of the corrugated piece take-off side slightly apart from the support roll, and a cutting blade for cutting at least the corrugated piece surface layer, and a cutting for adjusting the distance between the cutting blade and the support roll. It is composed of a depth adjusting device, a support roll and a pressing roll are arranged in-line with the extruder and the blade, and the corrugated piece after extrusion can be straightened in a state before being cured. Laminated surface layer cutting Location.