KR20110072672A - Plastic sheet width measuring system and plastic sheet manufacturing mathod using the same - Google Patents

Abstract

PURPOSE: A plastic sheet extruding and manufacturing system and a manufacturing method of a plastic sheet are provided to minimize the quantity of scraps and to maintain the quality of a plastic sheet. CONSTITUTION: A plastic sheet extruding and manufacturing system comprises a material hopper(100), an extruder cylinder(110), a constant pressure extruder(120), a sheet die(130), a polishing roll(140), a sheet width measuring instrument(150), a side scrap cutter(160), and a packing machine(170). The material hopper puts plastic materials into the extruder cylinder. The extruder cylinder fuses and transfers the plastic materials. The constant pressure extruder uniformly controls the pressure of the melted plastic materials. The sheet die molds the melted plastic materials in a sheet shape. The polishing roll cools and flattens the sheet. The sheet width measuring instrument is installed in the rear of the polishing roll. The side scrap cutter cuts side scraps of the sheet. The packing machine packs the cut sheet.

Description

Plastic sheet extrusion manufacturing system and plastic sheet manufacturing method using same {PLASTIC SHEET WIDTH MEASURING SYSTEM AND PLASTIC SHEET MANUFACTURING MATHOD USING THE SAME}

The present invention relates to a plastic sheet extrusion manufacturing system and a plastic sheet manufacturing method using the same, and more particularly, in the manufacture of a plastic sheet, the plastic sheet width measuring device is applied to the side of the plastic sheet to cut and discard the width of a predetermined size or more The present invention relates to a plastic sheet extrusion manufacturing system and a plastic sheet manufacturing method using the same to minimize the amount of scrap (Side Scrap).

In general, the plastic sheet is produced through a plastic sheet extrusion manufacturing system consisting of the raw material extrusion step, positive extrusion step, forming die step, polishing roll step, side scrap cutting step, packaging step.

Here, the side scrap cutting step is a process of cutting the width of the specification or more in order to commercialize the plastic sheet to a certain width standard, in the polishing roll step to produce a plastic sheet p size (p is a constant constant) larger than the standard p The% will be cut and discarded or recycled.

In order to satisfy the product quality while minimizing side scrap of the plastic sheet, it is necessary to produce a sheet with a size as large as a certain amount, which is a conventional technique. Or by measuring the mass of the plastic sheet by adjusting the extrusion amount of the positive extrusion device, or by adjusting the suction speed of the molten raw material supplied to the positive extrusion device by adjusting the screw speed of the extruder cylinder.

However, in the conventional plastic sheet as described above, measuring the width of the sheet by a rule due to the characteristics of the plastic sheet produced by the automation is not accurate measurement, and the plastic sheet produced is about 400 to 1400 mm wide. Due to the size, there is a problem that the cost is excessively added to separately apply a commercially available sheet width measuring apparatus.

Accordingly, the present invention has been invented to solve the above problems, the problem to be solved by the present invention is to apply a sheet width measuring device composed of a plurality of light emitting sensors and light receiving sensors, thereby reducing the width of the plastic sheet manufactured Approximate real-time, and approximate width information of the plastic sheet produced to control the rotational speed of the screw of the extruder and extruder cylinder to maintain the quality of the plastic sheet while minimizing the amount of side scrap It is to provide an extrusion manufacturing system and a plastic sheet manufacturing method using the same.

Plastic sheet extrusion production system according to an embodiment of the present invention for achieving this object is a raw material input device for injecting the plastic raw material into the cylinder, an extruder cylinder for melting and conveying the injected plastic raw material, and is supplied from the extruder cylinder A static extrusion device for constantly adjusting the pressure of the plastic melt, a sheet die for molding and extruding the transferred melt into a sheet shape, a polishing roll for flattening and cooling the extruded sheet, and a width of the plastic sheet passing through the polishing roll. To measure the approximate value, a sheet width measuring device installed on the transport path of the plastic sheet at the rear of the polishing roll, a side scrap cutter for cutting side scraps of the flattened plastic sheet, and a plastic sheet for which side scrap cutting is completed are packaged. Including packing machine made Characterized in that outputs a control signal to the hydrostatic extrusion controller for controlling the static pressure extrusion apparatus according to the approximate value of the sheet width measured by the width measuring device made of plastics for adjusting the amount of the hydrostatic pressure extrusion apparatus.

The sheet width measuring apparatus is installed on the upper portion of the plastic sheet spaced apart by a predetermined interval through the first sensor bracket, the optical signal generating unit including a plurality of light emitting sensors for irradiating light to the plastic sheet; Corresponding to each of the light emitting sensors are installed in the lower portion of the plastic sheet to be spaced apart at a predetermined interval corresponding to the position of each of the light emitting sensors through the second sensor bracket, respectively, and receives the light emitted from each of the light emitting sensors and the signal An optical signal receiving unit comprising a plurality of light receiving sensors for outputting; And calculating a width of the plastic sheet based on the signal output from the optical signal receiving unit, calculating an approximation value, and comparing the preset value with a preset value and outputting a control signal to the positive extrusion controller.

The positive extrusion controller is connected to the speed controller for controlling the screw speed of the extruder cylinder, characterized in that for controlling the screw speed of the extruder cylinder by outputting a control signal to the speed controller in accordance with the suction pressure of the positive extrusion device. do.

And the plastic sheet manufacturing method using the plastic sheet extrusion manufacturing system as described above, in the plastic sheet manufacturing method using the plastic sheet extrusion manufacturing system of any one of claims 1 to 3, (a) a plastic raw material is introduced into the cylinder Injecting the raw material into the extruder inlet from the raw material input device to heat to a predetermined temperature in the extruder cylinder to melt and transport the raw material in a gel state; (b) maintaining the conveyed plastic melt at a constant pressure using a constant pressure extrusion device and extruding the melt held at a constant pressure to a predetermined thickness through a sheet die; (c) planarizing the extruded plastic sheet with cooling; And (d) measuring the width of the flattened plastic sheet and cutting side scraps.

The step (d) may include measuring the width of the manufactured plastic sheet; Determining whether the width of the plastic sheet measured in the step is within a preset reference plastic sheet width value; And cutting and packing side scraps of the plastic sheet when the reference range condition is satisfied.

If the width of the plastic sheet calculated in the width measuring step of the plastic sheet is out of the range of the predetermined reference plastic sheet width value, (e) further comprising the step of adjusting the extrusion amount of the positive extrusion device .

Wherein (e) the step of adjusting the extrusion amount of the positive extrusion device; Determining whether the suction pressure of the molten raw material conveyed to the positive extrusion device through the extruder cylinder is appropriate; And if the suction pressure is appropriate, returning to extruding the melt.

Adjusting the screw speed of the extruder cylinder when the suction pressure of the molten raw material sucked into the constant pressure extrusion device is not appropriate in the constant pressure extrusion device adjusting step; And it is characterized in that the returned to the step of conveying the molten raw material to the positive extrusion device through the extruder cylinder.

The formula for measuring the width of the plastic sheet is W (width of the sheet) = S (distance between the first sensor between the two sheet width measuring devices) + (i (i-th sensor at which a signal is detected on one side of the plastic sheet)) + J (j-th sensor from which signals are detected on the other side of the plastic sheet) -2) x t (distance between each sensor) is satisfied.

According to the plastic sheet extrusion manufacturing system and the plastic sheet manufacturing method using the same according to an embodiment of the present invention as described above, by applying a sheet width measuring device composed of a plurality of light emitting sensors and light receiving sensors, the width of the manufactured plastic sheet Approximated in real time, and the width information of the plastic sheet produced is controlled to adjust the screw rotation speed of the extruder and the extruder cylinder to minimize the amount of side scrap while maintaining the quality of the plastic sheet. .

In addition, the width approximation value of the plastic sheet manufactured in a simple configuration using the light emitting sensor and the light receiving sensor can be measured in real time, thereby reducing costs and reducing unnecessary consumption of raw materials.

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

Prior to this, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, which can be replaced at the time of the present application It should be understood that there may be various equivalents and variations.

1 is a block diagram of a plastic sheet extrusion manufacturing system according to an embodiment of the present invention, Figure 2 is a block diagram of a sheet width measuring apparatus applied to the plastic sheet extrusion manufacturing system according to an embodiment of the present invention, Figure 3 Operational state diagram of the sheet width measuring apparatus according to an embodiment of the present invention.

Referring to the drawings, the plastic sheet extrusion manufacturing system according to an exemplary embodiment of the present invention, by applying a sheet width measuring device 150 composed of a plurality of light emitting sensors 153 and a light receiving sensor 157, a plastic sheet manufactured Approximating the width (W) of the 200 in real time, by adjusting the screw rotational speed of the extrusion device 120 and the extruder cylinder 110 through the approximate width (W) information of the plastic sheet 200 produced The amount of side scraps is minimized while maintaining the quality of the plastic sheet 200.

To this end, the plastic sheet extrusion manufacturing system according to an embodiment of the present invention, as shown in Figure 1, the raw material input device 100 for injecting the plastic raw material into the cylinder, and the extruder for melting and transporting the injected plastic raw material A cylinder 110, a static extrusion apparatus 120 for constantly adjusting the pressure of the plastic melt supplied from the extruder cylinder 110, a sheet die 130 for molding and extruding the transferred melt into a sheet shape, and And a polishing roll 140 to planarize the cooled extruded sheet.

And the plastic sheet extrusion manufacturing system is installed on the transport path of the plastic sheet 200 in the rear of the polishing roll 140 to measure the width approximation of the plastic sheet 200 passed through the polishing roll 140. It comprises a sheet width measuring device 150, a side scrap cutter 160 for cutting the side scraps of the flattened plastic sheet 200, and a packaging machine 170 for wrapping the plastic sheet is finished cutting the side scrap.

Here, the plastic sheet extrusion manufacturing system according to an embodiment of the present invention controls the positive extrusion device 120 in accordance with the approximation of the width (W) of the plastic sheet 200 measured by the sheet width measuring device 150 The control signal is output to the positive extrusion controller 121 to adjust the amount of pressure in the positive extrusion device 120.

In the present embodiment, the sheet width measuring apparatus 150, as shown in Figure 2, is composed of an optical signal generating unit 151, an optical signal receiving unit 155, and a controller 159, each of which When described in more detail by configuration as follows.

First, the optical signal generation unit 151 is installed on the upper portion of the plastic sheet 200 to be spaced apart at a predetermined interval through the first sensor bracket 152, a plurality of light emitting for irradiating light to the plastic sheet 200 It is configured to include a sensor 153.

In the present embodiment, the optical signal receiving unit 155 corresponds to each of the light emitting sensors 153 through the second sensor bracket 156 under the plastic sheet 200, respectively. It is installed to be spaced apart at a set interval corresponding to the position of, and comprises a plurality of light receiving sensors 157 for receiving the light emitted from each of the light emitting sensors 153 and outputs the signal.

Here, the sheet width measuring apparatus 150 is a set of the optical signal generating unit 151 and the optical signal receiving unit 155 on both sides of the plastic sheet 200 on the transport path of the plastic sheet 200. It is preferable that the ends are spaced apart from each other.

The controller 159 calculates an approximation value by calculating the width W of the plastic sheet 200 based on the signal output from the optical signal receiving unit 151, and compares the positive compression controller with the preset value. The control signal is output to 121).

The sheet width measuring apparatus 150 configured as described above has the light receiving sensor 157 receiving light when the light receiving sensor 157 receiving light emitted from each of the light emitting sensors 153 receives light. The controller 159 determines the number of light receiving sensors 157 from each light receiving sensor 157 which does not receive light through a signal output from the controller, and calculates an approximation value by calculating the width of the plastic sheet 200. The control signal is output to the positive extrusion controller 121 in comparison with the preset value, and the positive extrusion controller 121 outputs the extrusion amount of the positive extrusion apparatus 120 according to the control signal output from the controller 159. By adjusting the width of the plastic sheet 200 is maintained at a constant level.

Here, the positive extrusion controller 121 is connected to the speed controller 111 for controlling the screw speed of the extruder cylinder 110, to the speed controller 111 in accordance with the suction pressure of the positive extrusion device 120. The screw speed of the extruder cylinder 110 is adjusted by outputting a control signal.

That is, the sheet width measuring apparatus 150 detects the width of the plastic sheet 200 through the optical signal generating unit 151 and the optical signal receiving unit 155 and outputs the signal to the controller 159. The controller 159 calculates an approximation of the width W of the plastic sheet 200 according to the output signal.

At this time, when the calculated width W of the plastic sheet 200 is smaller by ΔW than the reference width W 'as shown in (S1) of FIG. 3, the controller 159 is a positive extrusion controller 121. And outputs a control signal, and according to the output signal, the positive extrusion controller 121 increases the extrusion amount of the positive extrusion device 120.

Here, when the suction pressure of the molten raw material flowing into the positive extrusion device 120 is low, the positive extrusion controller 121 outputs a control signal to the speed controller 111 to increase the screw speed, The suction pressure of the molten raw material flowing into the constant pressure extrusion device 120 is increased.

On the other hand, when the width W of the plastic sheet 200 calculated through the controller 159 is ΔW larger than the reference width W 'as shown in FIG. 3 (S2), the controller 159 The control unit outputs a control signal to the positive extrusion controller 121, and according to the output signal, the positive extrusion controller 121 reduces the extrusion amount of the positive extrusion unit 120.

At this time, when the suction pressure of the molten raw material flowing into the positive extrusion device 120 is high, the positive extrusion controller 121 outputs a control signal to the speed controller 111 to reduce the screw speed In addition, the suction pressure of the molten raw material introduced into the constant pressure extrusion device 120 is reduced.

That is, through this process, the plastic sheet extrusion manufacturing system may detect the width (W) of the plastic sheet 200 in real time through the sheet width measuring apparatus 150 and maintain the constant at the reference width (W). Minimizing the amount of side scrap while maintaining the quality of the plastic sheet 200, it is possible to reduce the amount of unnecessary raw material consumption.

Hereinafter, a plastic sheet manufacturing method using a plastic sheet extrusion manufacturing system according to an embodiment of the present invention configured as described above will be described in detail.

4 is a control flowchart illustrating a plastic sheet manufacturing method using a plastic sheet extrusion manufacturing system according to an embodiment of the present invention.

Plastic sheet manufacturing method using a plastic sheet extrusion manufacturing system according to an embodiment of the present invention (a) by inserting the plastic raw material into the cylinder in the raw material input device 100 into the extruder inlet to the predetermined in the extruder cylinder (110). Melting and conveying the raw material in a gel state by applying heat to a temperature; and (b) maintaining the transferred plastic melt at a constant pressure using a constant pressure extrusion device, and maintaining the melt held at a constant pressure through a sheet die. Extruding to thickness, (c) flattening the extruded plastic sheet while cooling, and (d) measuring the width of the flattened plastic sheet and cutting side scraps.

First, the plastic raw material is melted through the raw material input device 100 (S100), and the melted raw material is transferred to the positive extrusion device 120 through the extruder cylinder 110 (S110).

Thereafter, the positive extrusion device 120 maintains the plastic melt transferred to the positive extrusion device 120 through the extruder cylinder 110 at a constant pressure (S120), and the plastic melt constant pressure extrusion device 120 Extruded through a sheet die 130 to a predetermined thickness (S130).

The plastic sheet 200 extruded to a predetermined thickness through the sheet die 130 is cooled and planarized while passing through the polishing roll 140 (S140).

Thereafter, the width W of the plastic sheet 200 manufactured by passing through the polishing roll 140 is measured by the sheet width measuring apparatus 150 installed on the transport path of the plastic sheet 200 (S150). In step S160, it is determined whether the measured width W of the plastic sheet 200 is within a range of the reference width W ′ of the preset reference plastic sheet 200.

At this time, the formula for measuring the width W of the plastic sheet 200 is W (width of the sheet) = S (distance between the first sensor 153, 157 between the two sheet width measuring devices) + (i ( I-th sensor 153,157 detected at one side of the plastic sheet 200) + j (j-th sensor 153,157 detected at the other side of the plastic sheet 200) -2) × t ( The distance between the respective sensors 153 and 157).

Here, i denotes the i-th sensor 153, 157 on which a signal is detected at one side of the plastic sheet 200 based on the center of the plastic sheet 200, and j is a plastic based on the center of the plastic sheet 200. The j-th sensor 153, 157, the signal is detected on the other side of the sheet 200, t represents the distance between each sensor (153, 157), S is the first between the two sheet width measuring device 150 The distance between the first and second sensors 153 and 157 is shown.

On the other hand, the plastic sheet manufacturing method according to an embodiment of the present invention is the width (W) of the plastic sheet 200 calculated through the above-described measurement formula of the reference width (W ') value of the reference plastic sheet 200 preset If out of the range (that is, if the condition is not satisfied), further comprising the step of adjusting the extrusion amount of the positive extrusion device (120).

In the process of adjusting the extrusion amount of the positive extrusion unit 120, the extrusion amount of the positive extrusion unit 120 is adjusted according to the output signal output from the controller 159 (S170), at this time, the positive extrusion The controller 121 determines whether the suction pressure of the molten raw material conveyed to the positive extrusion device 120 through the extruder cylinder 110 is appropriate (S180).

Here, when the positive extrusion controller 121 determines that the suction pressure of the molten raw material conveyed to the positive extrusion device 120 is not appropriate (that is, does not satisfy the condition), the speed controller 111 controls the speed. After adjusting the screw speed of the extruder cylinder 110 by outputting a signal (S190), the process returns to the step (S110) and repeats the steps.

On the contrary, when the positive extrusion controller 121 determines that the suction pressure of the molten raw material conveyed to the positive extrusion device 120 is appropriate (that is, if the condition is satisfied), the process returns to the step S130 and the step is performed. Repeat these steps.

On the other hand, if the width W of the measured plastic sheet 200 is within the reference range condition (that is, if the condition is satisfied), the side scraps of the plastic sheet 200 are cut and packaged to end the control (S200). .

Therefore, according to the plastic sheet extrusion manufacturing system and the plastic sheet manufacturing method using the same according to an embodiment of the present invention configured as described above, the sheet width measuring device consisting of a plurality of light emitting sensors 153 and a light receiving sensor 157 ( By applying 150, the width W of the manufactured plastic sheet 200 is approximated in real time, and through the approximate width W of the plastic sheet 200 produced, the static extrusion device 120 and the extruder cylinder By adjusting the screw rotation speed of the 110 may minimize the amount of side scrap (Side Scrap) while maintaining the quality of the plastic sheet (200).

In addition, the width W approximation of the plastic sheet 200 manufactured in a simple configuration using the light emitting sensor 153 and the light receiving sensor 157 can be measured in real time, thereby reducing costs and unnecessary raw material consumption. .

As mentioned above, although this invention was demonstrated by the limited embodiment and drawing, this invention is not limited by this and is given by the person of ordinary skill in the art to the following, Of course, various modifications and variations are possible within the scope of equivalents of the claims to be described.

1 is a block diagram of a plastic sheet extrusion manufacturing system according to an embodiment of the present invention.

2 is a block diagram of a sheet width measuring apparatus applied to a plastic sheet extrusion manufacturing system according to an embodiment of the present invention.

3 is an operation state diagram of the sheet width measuring apparatus according to an embodiment of the present invention.

4 is a control flowchart illustrating a plastic sheet manufacturing method using a plastic sheet extrusion manufacturing system according to an embodiment of the present invention.

Claims (9)

A raw material input device for injecting plastic raw materials into the cylinder, An extruder cylinder for melting and conveying the injected plastic raw material; A constant pressure extrusion device for constantly adjusting the pressure of the plastic melt supplied from the extruder cylinder; A sheet die for molding and extruding the transferred melt into a sheet shape; A polishing roll for planarizing the extruded sheet while cooling; A sheet width measuring device installed on a conveyance path of the plastic sheet at the rear of the polishing roll to measure the width approximation value of the plastic sheet passing through the polishing roll; A side scrap cutter for cutting side scraps of the flattened plastic sheet, A packing machine for wrapping the plastic sheet with side scrap cutting completed, Plastic sheet extrusion manufacturing system characterized in that to control the amount of pressure of the positive extrusion unit by outputting a control signal to the positive extrusion controller for controlling the positive extrusion unit according to the width approximation value of the plastic sheet measured by the sheet width measuring device . The method of claim 1, The sheet width measuring device An optical signal generating unit disposed on the plastic sheet at a predetermined interval through a first sensor bracket, the optical signal generating unit including a plurality of light emitting sensors irradiating light to the plastic sheet; Corresponding to each of the light emitting sensors are installed in the lower portion of the plastic sheet to be spaced apart at a predetermined interval corresponding to the position of each of the light emitting sensors through the second sensor bracket, respectively, and receives the light emitted from each of the light emitting sensors and the signal An optical signal receiving unit comprising a plurality of light receiving sensors for outputting; And And calculating a width of the plastic sheet based on the signal output from the optical signal receiving unit, calculating an approximation value, and comparing the preset value with a controller to output a control signal to the positive extrusion controller. Manufacturing equipment. The method of claim 2, The positive extrusion controller is connected to the speed controller for controlling the screw speed of the extruder cylinder, characterized in that for controlling the screw speed of the extruder cylinder by outputting a control signal to the speed controller in accordance with the suction pressure of the positive extrusion device. Plastic sheet extrusion manufacturing apparatus. In the plastic sheet manufacturing method using the plastic sheet extrusion manufacturing system of any one of claims 1 to 3, (a) a step of melting and transporting the raw material in a gel state by applying heat to a predetermined temperature in the extruder inlet in a raw material input device for injecting the plastic raw material into the cylinder; (b) maintaining the conveyed plastic melt at a constant pressure using a constant pressure extrusion device and extruding the melt held at a constant pressure to a predetermined thickness through a sheet die; (c) planarizing the extruded plastic sheet with cooling; And (d) measuring the width of the flattened plastic sheet and cutting the side scraps. 5. The method of claim 4, (D) process Measuring the width of the manufactured plastic sheet; Determining whether the width of the plastic sheet measured in the step is within a preset reference plastic sheet width value; And Plastic sheet manufacturing method comprising the step of cutting and packaging the side scrap of the plastic sheet when the reference range condition is satisfied. The method of claim 5, When the width of the plastic sheet calculated in the width measuring step of the plastic sheet is out of the range of the predetermined reference plastic sheet width value, (E) a plastic sheet manufacturing method comprising the step of adjusting the extrusion amount of the positive extrusion device. The method of claim 6, (E) process Adjusting the extrusion amount of the positive extrusion device; Determining whether the suction pressure of the molten raw material conveyed to the positive extrusion device through the extruder cylinder is appropriate; And If the suction pressure is appropriate, the plastic sheet manufacturing method, characterized in that returned to the step of extruding the melt again. The method of claim 7, wherein If the suction pressure of the molten raw material sucked into the constant pressure extrusion device in the constant pressure extrusion device adjusting step, Adjusting the screw speed of the extruder cylinder; And Plastic sheet manufacturing method characterized in that the returned to the step of transferring the molten raw material to the positive extrusion device through an extruder cylinder. 5. The method of claim 4, The formula for measuring the width of the plastic sheet is W (width of the sheet) = S (distance between each first sensor between two sheet width measuring devices) + (i (i-th sensor with a signal detected on one side of the plastic sheet) A method of manufacturing a plastic sheet, characterized in that it satisfies + j (j-th sensor in which a signal is detected on the other side of the plastic sheet) -2) × t (distance between each sensor).

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