KR101782505B1 - Method of manufacruing polyethylene vinyl - Google Patents

Abstract

The present invention relates to a method for manufacturing a polyethylene vinyl material, which comprises the following steps: mixing a polyethylene resin and a cellulose pulp fiber; heating the mixed raw material to melt the raw material and extruding the molten raw material; injecting air into the extruded raw material to form a resin into a tube shape; pressing the tubular resin to form a vinyl fabric shape; irradiating the surface of the vinyl fabric with a high frequency to emboss the surface; slicing the vinyl fabric; and winding the vinyl fabric, wherein the extruding step is divided into a first step to a seventh step, wherein the raw material is heated and melted, the temperature is gradually increased from the first step to the fifth step, and in the fifth step to the seventh step, the raw material is heated while the temperature is gradually lowered. The present invention provides a method for manufacturing vinyl capable of minimizing the cooling height.

Description

METHOD OF MANUFACRUING POLYETHYLENE VINYL [0002]

The present invention relates to a method for producing a polyethylene vinyl, and more particularly, to a polyethylene vinyl manufacturing apparatus capable of adaptively adjusting a drying height according to a width of a vinyl film.

Generally, a polyethylene vinyl manufacturing apparatus uses a polyethylene resin as a raw material to make a thin and transparent film-like vinyl tube. Vinyl produced by a vinyl making machine is widely used for industrial, agricultural and everyday life.

Especially, low density polyethylene (LDPE) among polyethylene is widely used as a food packaging material. Therefore, safety is important when producing low density polyethylene.

On the other hand, vinyl which is extruded by a conventional vinyl-making machine has a tube shape. When the vinyl tube is extruded through the molding die to the outside of the extruder and molded, the vinyl tube is conveyed along the guide roller and the conveying roller and wound around the take-up roller to produce vinyl.

 Korean Patent Laid-Open Publication No. 1999-0034661 discloses an apparatus for producing a vinyl house film having improved durability.

Fig. 1 shows a conventional apparatus for producing a vinyl film.

1, the vinyl film production apparatus comprises an extrusion cylinder 2 for press-fitting the resin material 1, a heating part 3 for heating the resin material 1 to be extruded and fed, An air injection port 4 for blowing air and a mandrel portion 5 to which the resin expanded by the air is transferred to the blow tube 6 and quenching means 20 provided on both sides of the blow tube 6 A guide roller 7 through which the expanded resin is compressed and a rubber nip roller 8 through which the compressed resin passes, a nip roller 9 and a roller 8, And a winder roller (10). The quenching means 20 includes a compressor 21 for supplying air and a nozzle hose 23 connected to the compressor 21 and supplying hose 22 for supplying air and a nozzle 24 at an end thereof, A valve 25 provided on the nozzle fixture 23 for adjusting an amount of air to be supplied, a support 26 for supporting and fixing the nozzle fixture 23, And an adjustment handle 27 for adjusting the position of the nozzle fixture 23 fitted in the earth 26.

With the above-described configuration, the resin extruded through the blow tube 6 is formed into a tube shape and is transported upward. It is cooled and wound by air in the process of transportation.

At this time, for sufficient cooling, it is necessary to expose the air for a certain period of time before it is wound, and the height of the device must be sufficiently secured.

Especially, when the width of the vinyl fabric is wide, the height of the vinyl manufacturing apparatus should be high to secure the cooling time. However, when the height of the apparatus is raised, it is not only difficult to install but also difficult to follow up.

In addition, since vinyl produced from a low-density polyethylene resin is widely used as a food packaging material, it is necessary to add eco-friendly elements and also to strengthen the strength of the packaging material.

The present invention provides a vinyl manufacturing method capable of minimizing the cooling height.

The present invention also provides a method of making vinyl that provides an optimized cooling height along the width of the vinyl fabric.

Further, the present invention provides a vinyl manufacturing method capable of enhancing tensile strength.

A method for producing a polyethylenic vinyl fabric according to an embodiment of the present invention comprises: mixing a polyethylene resin and cellulose pulp fiber; Heating the mixed raw materials to melt and extrude them; Injecting air into the extruded raw material to form a resin into a tube shape; Pressing the tubular resin to form a vinyl fabric shape; Irradiating a surface of the vinyl fabric with a high frequency to emboss the surface; Slicing the vinyl fabric; And winding the vinyl fabric,

Wherein the extruding step is divided into a first step to a seventh step, wherein the raw material is heated and melted, the temperature is gradually increased from the first step to the fifth step, and the step from the fifth step to the seventh step is gradually And heating while lowering the temperature.

In the first step, the mixture is heated to 160 DEG C, the second step is heated to 162 DEG C, the third step is heated to 165 DEG C, the fourth step is heated to 166 DEG C, Deg.] C in the sixth step, and 165 [deg.] C in the sixth step, and 164 [deg.] C in the seventh step.

The cellulose pulp fibers may be mixed at 9 wt% to 11 wt%.

The method for fabricating a polyethylenic vinyl fabric includes: sensing a width of the vinyl fabric; And adjusting a height of the frame of the vinyl manufacturing apparatus to a predetermined height according to the detected width of the vinyl fabric.

According to the present invention, it is possible to miniaturize the apparatus by downsizing the cooling height of the vinyl manufacturing apparatus

Further, according to the present invention, the height of the vinyl manufacturing apparatus can be optimized according to the width of the vinyl fabric, so that the space can be efficiently used.

Further, according to the present invention, it is possible to enhance the tensile strength of the vinyl fabric by adding cellulose pulp fiber to the polyethylene resin.

Further, according to the present invention, the transparency of the vinyl fabric can be improved by heating the temperature of the extruded portion sequentially while increasing the temperature.

Figure 1 shows a prior art vinyl fabric manufacturing apparatus.
FIG. 2 shows a vinyl fabric manufacturing apparatus according to an embodiment of the present invention.
Fig. 3 shows the fuel supply unit, the extruding unit, and the molding unit of Fig. 2 in detail.
FIG. 4 shows the width sensing unit of FIG. 2 in detail.
Fig. 5 shows details of the three sections of Fig.
Fig. 6 shows the frame of Fig. 2 in detail.
7 is a cross-sectional view taken along the line AA in Fig.
8 illustrates a method of fabricating a vinyl fabric according to an embodiment of the present invention.
9 illustrates a method of fabricating a vinyl fabric according to another embodiment of the present invention.
10 shows the results of the tensile strength test of the vinyl fabric according to the present invention.

The embodiments may be modified in other forms or various embodiments may be combined with each other, and the scope of the present invention is not limited to each embodiment described below.

Although not described in the context of another embodiment, unless otherwise described or contradicted by the description in another embodiment, the description in relation to another embodiment may be understood.

For example, if the features of configuration A are described in a particular embodiment, and the features of configuration B are described in another embodiment, even if the embodiment in which configuration A and configuration B are combined is not explicitly described, It is to be understood that they fall within the scope of the present invention.

In the description of the embodiment according to the present invention, in the case of being described as being formed "on or under" of each element, the upper (upper) or lower (lower) or under are all such that two elements are in direct contact with each other or one or more other elements are indirectly formed between the two elements. Also, when expressed as "on or under", it may include not only an upward direction but also a downward direction with respect to one element.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG.

FIG. 2 shows a vinyl fabric manufacturing apparatus according to an embodiment of the present invention.

2, the apparatus for fabricating a vinyl fabric according to an embodiment of the present invention includes a fuel supply unit 100, an extrusion unit 200, a molding unit 300, a high frequency application unit 400, a width sensing unit 500, A trimming section 600, a winding section 700, and a control section 900. [ And these components may be supported by the frame 800.

3 is a detailed view of the fuel supplying unit 100, the extruding unit 200 and the forming unit 300 of the vinyl fabric manufacturing apparatus. FIG. 4 shows the high frequency applying unit 400, 800 shown in FIG.

The fuel supply unit 100 is for supplying a polyethylene resin and includes an inlet 110 and a storage unit 120. The inlet 110 has an air inlet 111 and a fuel inlet 112 And a hose is connected to the air inlet 111 and the fuel inlet 112, respectively. The air intake port 111 may be connected to a suction motor (not shown) through a hose 113. The fuel supply port 112 may be connected to a polyethylene reservoir (not shown) in which a large amount of polyethylene resin is stored via the hose 114. When the air intake port 111 sucks air by the above-described structure, a pressure difference is generated, and polyethylene can be introduced into the polyethylene reservoir connected to the fuel supply port 112. Therefore, even if the manager does not provide the polyethylene resin separately, the fuel can be supplied automatically.

At this time, the polyethylene reservoir may contain additives other than the polyethylene resin. That is, the polyethylene resin and the additive may be mixed and supplied to the fuel supply port 112. As the additive, cellulose pulp fibers may be added in a concentration of 9 wt% to 11 wt%. The tensile strength of the vinyl fabric can be enhanced by adding cellulosic pulp fibers.

The fuel supply part 100 provides a polyethylene resin to the extrusion part 200. The extrusion part 200 is formed in a cylinder shape, and a heating member such as an electric heating wire is formed to heat and melt the resin. The extruding unit 200 includes a connecting neck 206 and a rotating body 207 that include the first to fourth cylinders 201 to 204 and the head 205 and are connected to the forming unit 300 . The heating temperature from the first cylinder 201 to the head 205 gradually increases and the heating temperature from the head 205 to the rotating body 207 gradually decreases.

For example, the heating temperature of the first cylinder 201 is 160 ° C, the heating temperature of the second cylinder 202 is 162 ° C, the heating temperature of the third cylinder 203 is 165 ° C, The heating temperature of the head 205 is 170 deg. C, the heating temperature of the coupling neck 206 is 165 deg. C, and the heating temperature of the rotating body 207 is 164 deg.

As described above, the transparency of the vinyl film can be improved by heating the cylinder at a heating temperature gradually raised and then lowered again.

The molten resin material in the extrusion part 200 is formed into a tube shape in the molding part 300 and is transported upward.

The molding unit 200 includes a molding die 310, a cooling unit 320, and an air injection unit 330.

The molding die 310 receives the molten resin material from the extrusion unit 200 and shapes it into an empty tubular blow tube 311 and outputs it in the upward direction. Air is injected into a mandrel portion (not shown) provided in the molding die 310, the resin is expanded and formed into a tube shape and moved upward. The air is injected through the air injection unit 330.

The cooling unit 320 blows air to the molding die 310 to cool the blow tube 311. A plurality of the cooling units 320 may be formed on the side surface of the molding die 310. That is, a plurality of through holes may be formed on the side surface of the molding die 310. The through holes are connected to the air injection hose to inject air into the molding die 310 to cool the blow tube.

The air injection unit 330 blows air into the molten resin. The size of the blow tube may be adjusted according to the amount of air injected from the air injection unit 330. That is, when the amount of air injected is large, the size of the blow tube increases. When the amount of air injected is small, the size of the blow tube decreases.

That is, the forming unit 300 injects air from the air injecting unit 330 to blow air into the resin, and the melted resin is expanded by the air to form a blow tube, and the resin is transferred upward. At this time, a cooling part 320 is disposed on a side surface of the molding part 300 to blow air through the blow tube to cool the blow tube.

The blow tube 311 is compressed and transported in the form of a sheet-like vinyl fabric through a pressure roller 351 and a compression roller 352 provided on the upper part of the forming part 300. A plurality of rollers may be provided between the forming part 300 and the take-up part 700, but a detailed description of the rollers will be omitted.

A high frequency applying unit 400 is installed on the upper part of the frame 800.

The high frequency applying unit 400 applies a high frequency to the surface of the vinyl fabric. As described above, vinyl fabric using low density polyethylene resin is widely used as packaging material such as food packaging material, and various kinds of texts and pictures such as product name and logo are printed on the packaging material. By applying a high frequency to the surface of the vinyl fabric, the coating material or the printing component can be smoothly adsorbed. The high frequency applying unit 400 may be disposed at the top of the apparatus. This is because, when the vinyl fabric 1 is scanned after being cooled or completely cooled, the effect of adsorbing the coating material is deteriorated even when a high frequency is applied to the vinyl fabric 1.

The width sensing unit 500 senses the width of the vinyl fabric and transmits the sensed width to the controller 900. The control unit 900 can adjust the amount of air injected into the air injection unit 330 according to the detected width of the vinyl fabric. That is, when the width of the vinyl measured through the width sensing unit 500 is less than a preset width, the controller 900 increases the pressure of air filled in the resin, and the width sensing unit 500 The control unit controls the air injection unit 330 so that the pressure of the air filled in the resin decreases.

FIG. 4 shows an embodiment of the width sensing unit 500. FIG. The embodiment shown in Fig. 4 is only one embodiment, and the present invention is not limited thereto.

Referring to FIG. 4, the width sensing unit 500 includes a cradle 510 provided adjacent to the vinyl conveyed by the guide rollers, a cradle 510 installed on the cradle 510, An actuator 530 for moving the measuring jig 520 in accordance with a width of the vinyl to be manufactured and an actuator 530 mounted on the measuring jig 520 for moving the measuring jig 520, And a position sensing unit 540 for measuring the position of the edge of the vinyl which passes through the passage 521.

The holder 510 is preferably installed on the frame 205 spaced upward with respect to the forming unit 300 and may be formed flat so that the actuator 530 can be fixed on the upper surface.

The measuring jigs 520 are supported by the cradle 510 so as to be slidable in a direction intersecting with the feeding direction of the vinyl by the actuator 530. The measuring jigs 520 are respectively opened at the front and rear sides with respect to the longitudinal direction of the vinyl so that the edge of the vinyl can be drawn into the passage 521. The measuring jig 520 has a " Respectively.

The actuator 530 is installed in the holder 510 to move the measuring jig 520 in a direction intersecting with the feeding direction of the vinyl. The actuator 530 may be constituted by a jack screw operated by a drive motor or a hydraulic cylinder stretched and contracted by hydraulic pressure. The operator can easily move the measuring jig 520 even at a long distance by the actuator 530.

The position sensing unit 540 senses the edge of the vinyl that has flowed into the passage 521. The position sensing unit 540 includes a light generator 541 disposed on the inner surface of the measurement jig 520 facing the edge of the vinyl, And an optical receiver 542 installed on the inner surface of the measuring jig 520 at a position opposite to the light generator 541 and receiving light generated from the light generator 541.

At this time, the light generator 541 is installed in the ceiling of the measurement jig 520 at a position spaced a predetermined distance from one side of the measurement jig 520, and the optical receiver 542 is disposed opposite to the light generator 541 And is provided on the bottom surface of the measurement jig 520. At this time, the operator preferably adjusts the mounting position of the measuring jigs 520 with respect to the vinyl so that the light generator 541 and the optical receiver 542 are located at positions adjacent to the edge of the vinyl having a predetermined width.

The vinyl fabric 1 having passed through the high frequency applying part 400 and the width sensing part 500 is cut to have a constant width in the cut portion 600.

FIG. 5 shows an embodiment of the cut-out 600. FIG.

As shown in Fig. 5, the trimming section 600 is disposed in front of the vinyl fabric 1 to cut the width of the vinyl fabric 1 to a predetermined width. A cutter blade 601 is attached to the cutter 600 so that the vinyl fabric 1 can be cut as it passes the cutter blade. The trestle 600 is installed on the edge of the vinyl fabric so as to be movable along the guide bar 602. [ Accordingly, the cutter 600 can be moved in accordance with the width of the vinyl fabric so that the vinyl fabric can be cut to a desired width. Even if the width of the vinyl fabric is set in advance, the width of the vinyl fabric passing through the forming portion 300 is not accurate. Therefore, the width of the vinyl fabric can be precisely cut by using the three-fold portion.

Meanwhile, the height of the vinyl fabric manufacturing apparatus, that is, the height of the frame 800, can be adjusted according to the width of the vinyl fabric 1. When the width of the vinyl fabric is wide, the height of the frame 800 is adjusted to be high, and when the width of the vinyl fabric is narrow, the height of the frame 800 can be adjusted low.

Figs. 6 and 7 show the height adjustment configuration of the frame 800. Fig.

6 and 7, the frame 800 includes a support frame 810 and an upper frame 820. A bearing 830 and a drive motor 840 are formed on the upper surface of the support frame 810. [ .

The inside of the support frame 810 is empty, and a thread 821 is formed on the outer circumferential surface of the upper frame 820.

The bearing 830 has a ring shape having a predetermined height, and a screw groove 831 is formed on the inner circumferential surface thereof. The threaded groove 831 may be coupled to the upper frame 820 in a threaded manner in correspondence with the threaded portion 821 formed on the outer peripheral surface of the upper frame 820.

Accordingly, when the bearing 830 rotates, the upper frame 820 also rotates and moves in the vertical direction.

The driving motor 840 can be arranged radially along the outer circumferential surface of the upper frame 820 and has a vertical rotation axis 841 parallel to the upper frame 820. [ The drive motor 840 is provided with a gear 842 engaged with the teeth formed on the outer surface of the bearing 830.

A predetermined distance of teeth 832 formed on the outer surface of the bearing 830 is engaged with the gear 842 of the drive motor 840 so that the rotational force of the drive motor 840 is transmitted to the bearing 830 .

The driving motor 840 operates under the control of the controller 900. When the driving motor 840 rotates, the bearing 830 engaged with the gear 842 of the driving motor rotates, The frame 820 is raised or lowered. Therefore, the height of the frame 800 can be adjusted according to the width of the vinyl fabric.

For example, if the width of the vinyl fabric is 900 mm to 1600 mm, the height of the frame may be 9.6 m. In the case of producing the vinyl fabric of the above range, it is possible to produce without changing the frame height, but according to the prior art, a separate vinyl fabric manufacturing device must be installed in order to produce a larger vinyl fabric. However, according to the present invention, a vinyl fabric having a wider width can be produced through height adjustment. For example, in order to produce a vinyl fabric having a width of about 2000 mm, the height should be about 12.7 m or more. Therefore, if the height of the upper frame is adjusted by rotating the driving motor, the height of the entire frame can be increased to 12.7 m. It is therefore possible to produce a wide range of vinyl fabrics with one machine.

The control unit 900 controls the overall operation of the vinyl fabric manufacturing apparatus such as temperature control of the extrusion unit, speed of the winding roller, and the like in addition to the height adjustment of the frame.

The control unit 900 may include a memory (not shown) for storing the height of the frame corresponding to the width of the vinyl fabric.

As described above, according to the vinyl fabric manufacturing apparatus of the embodiment of the present invention, the strength of the vinyl fabric can be enhanced by appropriately mixing and melting the polyethylene resin and the cellulose pulp fiber. Further, the transparency of the vinyl fabric can be improved by melting the resin by a method of gradually increasing the temperature of the extruded portion.

In addition, according to the present invention, it is possible to manufacture vinyl fabrics of various widths by a single apparatus by adjusting the frame height of the vinyl fabric manufacturing apparatus.

Figure 8 shows a method of making a vinyl fabric according to the present invention.

Referring to FIG. 8, the vinyl fabric manufacturing method includes steps S100, S200, S300, S400, S600, and S600 .

In the step S100, the polyethylene resin composition is introduced into the apparatus. At this time, 9 wt% to 11 wt% of cellulose pulp fiber may be added to the polyethylene resin. The tensile strength of the vinyl fabric formed by adding the cellulose pulp fiber to the polyethylene resin can be enhanced.

The extrusion step (S200) is a step of heating the molten raw material, that is, the polyethylene mixture resin, and extruding the melted material. In this case, the temperature is gradually increased from the first stage to the fifth stage while the temperature is gradually lowered from the fifth stage to the seventh stage. For example, in the first step, heating is carried out at 160 ° C., in the second step at 162 ° C., at the third step at 165 ° C., at the fourth step at 166 ° C., at the fifth step at 170 ° C. In the sixth step, to 165 ° C in the sixth step, and to 164 ° C in the seventh step.

In the molding step (S300), air is injected into the molten extrudate to be formed into a tube shape. The tube-shaped molding may be pressed by a roller to be in the form of a vinyl fabric.

In the high frequency scanning step (S400), a high frequency is scanned on the surface of the vinyl fabric. By injecting high frequencies onto the surface of the vinyl fabric, the coating material can be adsorbed well onto the surface of the vinyl fabric.

The trimming step S500 is a step of reducing the width of the vinyl fabric to a preset width. An error is generated in the width of the extruded vinyl fabric so that it can be cut exactly to a desired width.

The winding step (S600) is a step of winding on a winding roller of a vinyl fabric. When the winding roller is rotated, the vinyl fabric formed in the forming part due to the tension of the vinyl fabric is wound around the winding roller while moving along the plurality of rollers.

After the polyethylene resin mixture is melted and formed into a blow tube by the above-described method, the mixture is pressed by a pressure roller to show a shape of a vinyl fabric. After the high frequency is irradiated on the surface, the polyethylene resin mixture is cut to a suitable size, do.

9 shows another embodiment of the present invention.

The embodiment according to FIG. 9 further includes a step S500 of detecting the width of the vinyl fabric and a step S600 of adjusting the height of the frame of the vinyl fabric manufacturing apparatus according to the detected width.

In step S500 of detecting the width of the vinyl fabric, as shown in FIG. 5, the width detecting unit detects the width of the fabric and transmits the detection result to the controller. The control unit receives the data and determines whether the height of the frame corresponding to the width of the vinyl fabric is properly set to adjust the height of the frame.

In step S600 of adjusting the height of the frame, the height of the frame of the vinyl fabric manufacturing apparatus is adjusted to a predetermined height by receiving the detected width of the vinyl fabric. The height of the appropriate frame corresponding to the vinyl fabric width may then be stored in the memory.

For example, if the width of the vinyl fabric is 1000mm, the height of the frame should be 5.7m or more. If the width of the vinyl fabric is 1000mm and the height of the frame is lower than the reference height (5.7m), raise the height of the frame so that the vinyl fabric can be sufficiently cooled.

10 shows the results of tensile strength test of the vinyl fabric produced according to the present invention.

Referring to FIG. 10, it can be seen that the tensile strength of the polyethylene vinyl fabric according to the present invention is higher than that of the conventional polyethylene vinyl fabric according to the prior art.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood that various modifications and applications are possible. For example, each component specifically shown in the embodiments can be modified and implemented. It is to be understood that all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

100: fuel supply unit 200:
300: forming part 400: high frequency scanning part
500: width detecting unit 600:
700: winding section 800: frame
810: Support frame 820: Upper frame
830: Bearing 840: Drive motor
841: rotational shaft 842: gear
900:

Claims (4)

Mixing the polyethylene resin and the cellulose pulp fiber;
Heating the mixed raw materials to melt and extrude them;
Injecting air into the extruded raw material to form a resin into a tube shape;
Pressing the tubular resin to form a vinyl fabric shape;
Irradiating a surface of the vinyl fabric with a high frequency to emboss the surface;
Slicing the vinyl fabric; And
Winding the vinyl fabric,
Wherein the extruding step is divided into a first step to a seventh step, wherein the raw material is heated and melted, the temperature is gradually increased from the first step to the fifth step, and the step from the fifth step to the seventh step is gradually And heating the mixture while lowering the temperature. The method according to claim 1,
In the first step, the mixture is heated to 160 DEG C, the second step is heated to 162 DEG C, the third step is heated to 165 DEG C, the fourth step is heated to 166 DEG C, Deg.] C, heating in the sixth step to 165 [deg.] C, and heating in the seventh step to 164 [deg.] C. The method according to claim 1,
Wherein the cellulose pulp fibers are mixed at 9 wt% to 11 wt%. The method according to claim 1,
Sensing a width of the vinyl fabric; And
And adjusting the height of the frame of the vinyl manufacturing apparatus to a predetermined height according to the detected width of the vinyl fabric.

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