KR20190002474U - Apparatus for polyethylene sheet - Google Patents

Abstract

An apparatus for producing polyethylene sheet is disclosed.
Polyethylene sheet manufacturing apparatus according to an embodiment of the present invention is a hopper into which polyethylene support material is added; An extruder for melting and extruding the polyethylene support material flowing from the hopper; A gear pump disposed in a movement path of the molten resin and blocking a vibration and a pressure change generated in the extruder to maintain a constant extrusion amount of the resin; A T-die for molding a molten resin transferred into the gear pump into a sheet shape; A cold forming roll composed of a lower roll, an intermediate roll, and an upper roll, for cooling and molding the resin discharged from the T-die into a sheet having a predetermined thickness; Primary and secondary pull rolls for pulling the polyethylene sheet cold-formed in the cold forming roll; A scanner for measuring the thickness of the polyethylene sheet conveyed through the primary pull roll; And a winder for winding the formed polyethylene sheet, wherein the intermediate roll includes a long rod-shaped inner roll and an outer roll, and the outer roll includes a roll surface and a roll shell in direct contact with the polyethylene resin. The roll shell portion is provided on both sides of the outer roll, and the roll surface is provided in a relatively wide area at the center portion except for the roll shell portion, and the roll surface is longitudinally and transversely. It is composed of a repeatedly formed protrusions and the base pattern portion, the protrusion portion is formed in an intaglio to have a frusto-conical shape, the base pattern portion may be formed intaglio around the projection portion.

Description

Apparatus for polyethylene sheet

The present invention relates to the production of a polyethylene sheet, and more particularly, in manufacturing a sheet made of polyethylene resin as a main material, it is possible to exert an anti-slip effect by providing embossed irregularities to the surface of the polyethylene sheet to be produced by imparting friction force A polyethylene sheet manufacturing apparatus.

Polyethylene is inexpensive, has excellent moldability and physical properties, and is widely used in various fields, and is manufactured and used in various shapes according to a manufacturing apparatus and a manufacturing method.

Polyethylene-based sheets are used for various applications such as waterproofing and moisture proof layers, and are manufactured to have a thickness of approximately 0.25-2.5 mm and a width of 0.9-1.8 m.

The polyethylene sheet is usually produced by a sheet manufacturing apparatus composed of an extruder, a die, a forming roll, a roll table, a trimming roll, a take-up roll, a cutter, and the like.

The polyethylene sheet manufactured by the conventional sheet manufacturing apparatus as described above forms an intaglio pattern on the surface of the sheet attached to the surface of the roll, and adopts a method of filling the intaglio pattern with polymer resin in multiple stages to effectively exhibit frictional force. There was a problem that it is difficult to implement the uneven pattern on the surface of the polyethylene sheet.

Republic of Korea Patent No. 10-0899310 (Registration Date: May 19, 2009) Republic of Korea Patent No. 10-0823142 (Registration Date: April 11, 2008)

The present invention has been made in view of the above-mentioned, by forming a concave-convex irregularities that can be variously changed design on the surface of the intermediate roll of the cold forming roll of the polyethylene sheet manufacturing apparatus to effectively produce a friction force on the sheet surface It aims at providing the polyethylene sheet manufacturing apparatus which can provide and exhibit the outstanding anti-slip effect.

Another object of the present invention is to provide a polyethylene sheet manufacturing apparatus that can maintain a constant discharge amount of the resin by a gear pump, stabilize the quality of the polyethylene resin produced by efficiently arranging each constituent means and further improve the production efficiency. It is in doing it.

Another object of the present invention is to provide a polyethylene sheet manufacturing apparatus that can detect pinholes or defects that may be included in the sheet to be manufactured in real time in the manufacturing process by non-destructive inspection, thereby improving the quality of the polyethylene sheet produced. Is in.

The object of the present invention is not limited to the above, other objects that are not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the object as described above, the present invention provides a polyethylene sheet manufacturing apparatus, the polyethylene sheet manufacturing apparatus according to an example of the present invention is a hopper to which polyethylene water support material is injected; An extruder for melting and extruding the polyethylene support material flowing from the hopper; A gear pump disposed in a movement path of the molten resin and blocking a vibration and a pressure change generated in the extruder to maintain a constant extrusion amount of the resin; A T-die for molding a molten resin transferred into the gear pump into a sheet shape; A cold forming roll composed of a lower roll, an intermediate roll, and an upper roll, for cooling and molding the resin discharged from the T-die into a sheet having a predetermined thickness; Primary and secondary pull rolls for pulling the polyethylene sheet cold-formed in the cold forming roll; A scanner for measuring the thickness of the polyethylene sheet conveyed through the primary pull roll; And a winder for winding the formed polyethylene sheet, wherein the intermediate roll includes a long rod-shaped inner roll and an outer roll, and the outer roll includes a roll surface and a roll shell in direct contact with the polyethylene resin. The roll shell portion is provided on both sides of the outer roll, and the roll surface is provided in a relatively wide area at the center portion except for the roll shell portion, and the roll surface is longitudinally and transversely. It is composed of a repeatedly formed protrusions and the base pattern portion, the protrusion portion is formed in an intaglio to have a frusto-conical shape, the base pattern portion may be formed intaglio around the projection portion.

In addition, the present invention is a conveyor roll for transporting the polyethylene sheet is disposed between the cold forming roll and the primary pull roll; And a pinhole detector disposed between the primary pull roll and the scanner to detect a pinhole or a defect present in the polyethylene sheet by nondestructive inspection.

The protruding portion is formed to a depth of 0.4 ~ 0.8mm from the surface of the intermediate roll, the upper diameter of the protrusion located on the surface of the intermediate roll is 1 ~ 3mm, the lower diameter of the protruding portion is 0.2 ~ 0.4 may be mm.

The base pattern portion may be formed to a depth of 0.1 ~ 0.3mm from the surface of the intermediate roll.

The left and right distances up and down in which the protrusions are repeatedly formed on the surface of the roll are set at intervals of 3 mm, and the left and right distances up and down in the direction where the protrusions and the base pattern are repeatedly formed may be set at intervals of 6 mm. .

The T-die may be a Coat Hanger-type die.

According to the present invention as described above, the embossed irregularities are formed on the surface of the polyethylene sheet by the projections and the base pattern portion repeatedly formed in the longitudinal direction and the transverse direction on the intermediate roll surface of the cooling roll to form a frictional force By providing it, a more excellent slip prevention effect can be exhibited. Such polyethylene sheets can be varied in their design to suit the intended use, and can provide a variety of physical, mechanical and chemical properties to meet the design requirements of a wide range of applications.

In addition, the present invention can maintain a constant discharge amount of the resin by the gear pump, stabilize the quality of the polyethylene resin produced by efficiently disposing the respective constituent means and can further improve the production efficiency.

In addition, the present invention can detect pinholes or defects that may be included in the sheet to be manufactured in real time in the manufacturing process by non-destructive inspection, it is possible to improve the quality of the polyethylene sheet produced.

Effects of the present invention is not limited to the above, other effects that are not mentioned will be clearly understood by those skilled in the art from the following description.

1 is a schematic diagram of a polyethylene sheet manufacturing apparatus according to an embodiment of the present invention.
2 is a view showing a detailed configuration of the intermediate roll constituting a part of the cooling forming roll shown in FIG.
3 is an actual roll surface photograph of an intermediate roll constituting a part of the cooling forming roll shown in FIG.
FIG. 4 is a view showing a surface portion of a polyethylene sheet manufactured using the intermediate roll shown in FIG. 3.
FIG. 5 is an actual photograph showing the surface of a polyethylene sheet manufactured using the intermediate roll shown in FIG. 3.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention can be implemented in many different forms and should not be construed as limited to the embodiments set forth herein.

In order to clearly describe the present invention, parts irrelevant to the description are omitted, and like reference numerals designate like elements throughout the specification.

In addition, in various embodiments, components having the same configuration will be described only in the exemplary embodiment using the same reference numerals, and in other embodiments, only the components different from the exemplary embodiment will be described.

Throughout the specification, when a part is "connected" with another part, it includes not only "directly connected", but also "indirectly connected" with another member therebetween. In addition, when a part is said to "include" a certain component, it may mean that other components are not included, except in addition to the description to the contrary, further includes other components.

1 is a schematic diagram of a polyethylene sheet manufacturing apparatus according to an embodiment of the present invention.

Referring to Figure 1, the polyethylene sheet manufacturing apparatus 100 according to an embodiment of the present invention is a hopper 10 to which the polyethylene support material is injected, to melt and extrude the polyethylene support material introduced from the hopper 10 For an extruder 20. The extruder 20 is preferably arranged in two groups in parallel.

The polyethylene sheet manufacturing apparatus 100 includes a gear pump 30 disposed downstream of the extruder 20 based on the conveying direction of the polyethylene resin, the gear pump 30 is discharged from the extruder 20 It is installed in order to solve surging (phenomena of uneven resin discharge amount) of the polyethylene resin, and blocks the vibration and pressure fluctuations generated by the screw (not shown) located in the extruder 20 to maintain a constant extrusion amount. Function to keep it running.

In addition, the polyethylene sheet manufacturing apparatus 100 includes a T-die 40 disposed downstream of the gear pump 30, the T-die 40 is a resin melted and discharged in the extruder 20 As it arrange | positions in order to shape | mold in sheet shape widely, it is preferable that it consists of a coat hanger-type die. The coat hanger type die is a type of T-die used for sheet extrusion, and has a small cross-sectional area at the center of the distributing groove for evenly discharging the plastic molten material to the manifold inside the die, and both ends thereof in the extrusion direction. It is inclined to form a coat hanger. That is, the resin flow path inside the die is designed to extrude under the same flow resistance in the manifold and the preland throughout the die.

In addition, the polyethylene sheet manufacturing apparatus 100 includes a cooling forming roll 50 disposed downstream of the T-die 40, the cooling forming roll 50 is the lower roll 51, the intermediate roll 52 And an upper roll 53, which is a roll for cooling molding the resin discharged from the T-die 40 into a sheet having a predetermined thickness. The heat medium oil is circulated in the cooling forming roll 50 to maintain a predetermined temperature.

2 is a step-by-step view showing the manufacturing process of the intermediate roll constituting a part of the cooling forming roll, it is a view showing the structure of a textured roll (textured roll).

Referring to FIG. 2, the intermediate roll 52 includes an elongated rod-shaped inner roll 52a and an outer roll 52b, wherein the inner side of the inner roll 52a has a thermal medium oil inlet on one side and the other side, respectively. The cooling pipe 52c having W1 and the heat medium oil outlet W2 extends in the longitudinal direction, and a mist outlet 52d is formed at one end of the inner roll 52a. The journal 52e is disposed at both boundary portions of the inner roll 52a and the outer roll 52b. A jacket chamber 52f is provided in the radially inner side of the outer roll 52b surrounding the inner roll 52a, and a spiral fluid circulation tube 52g for circulating heat medium oil is disposed in the jacket chamber 52f. .

The outer roll 52b can be divided into a roll surface 52h and a roll shell portion 52i in direct contact with the polyethylene resin material. The roll shell portion 52i is provided on both sides of the outer roll 52b and the roll surface 52h is provided in a relatively wide area at the center portion except for the roll shell portion 52i.

3 is an actual roll surface photograph of the cold rolled intermediate roll shown in FIG. 2, FIG. 4 is a view showing the surface of a polyethylene sheet manufactured using the intermediate roll shown in FIG. 3, and FIG. 5 is shown in FIG. Actual surface photograph of polyethylene sheet produced using the prepared intermediate roll.

3 and 5, the roll surface 52b of the cooling roll intermediate roll 52 is composed of a projection portion P and a ground pattern portion BT formed repeatedly in the longitudinal and transverse directions. At this time, the base pattern portion BT is formed intaglio with a depth of 0.1 mm to 0.3 mm, preferably 0.2 mm from the surface of the intermediate roll 52. The protruding portion P is formed in an intaglio to have a roughly truncated cone shape, and is formed with a depth H of 0.4 to 0.8 mm, preferably 0.6 mm from the surface of the intermediate roll 52. The upper diameter D1 of the projection P formed in the intaglio is 1 to 3 mm, preferably 2 mm, and the lower diameter D2 of the projection P is 0.2 to 0.4 mm, preferably 0.3 mm.

The left and right and up and down distances A in which the projections P are repeatedly formed on the roll surface 52b of the intermediate roll 52 for cooling molding are set at intervals of 2 to 4 mm, preferably 3 mm. The left and right and up and down distances B in which the protruding portion P and the ground pattern portion BT are repeatedly formed are set at intervals of 4 to 8 mm, preferably 6 mm.

In this way, after the projection portion P and the ground pattern portion BT are intaglio formed on the roll surface 52b of the cooling roll intermediate roll 52, chromium (Cr) plating is performed at a thickness of about 30 占 퐉. Through the surface treatment process, the roll surface 52b of the intermediate roll 52 of the final shape as shown in FIG. 3 is obtained.

Referring back to Figure 1, the polyethylene sheet manufacturing apparatus 100 according to an embodiment of the present invention is the conveyor roll 54 and the primary pull roll (arranged in order) downstream of the cooling molding roll 50 ( 60, wherein the conveyor roll 54 transfers the cold-formed sheet to the primary pull roll 60 while passing through the cold forming roll 50, and the primary pull roll 60 performs a function of pulling the sheet. do.

In addition, the polyethylene sheet manufacturing apparatus 100 includes a pinhole detector 62 disposed downstream of the primary pull roll 60, which is present in the sheet to prevent damage to the sheet later. It performs a function to accurately detect pinholes and defects that may be caused by non-destructive inspection.

In addition, the polyethylene sheet manufacturing apparatus 100 includes a scanner 70 disposed downstream of the pinhole detector 62. The scanner measures the thickness of the sheet and feeds it back, thereby uniformly adjusting the thickness of the manufactured sheet. It performs the function.

The polyethylene sheet manufacturing apparatus 100 includes a secondary pull roll 80 disposed downstream of the scanner 70, and the secondary pull roll 80 is subjected to cold forming while passing through a cold forming roll 50. The function of taking out the sheet is performed.

In addition, the polyethylene sheet manufacturing apparatus 100 includes a cutoff roll 82 disposed downstream of the secondary pull roll 80, the cutoff roll 82 is a cutter (not shown) to cut the sheet to a desired length. When cutting with), you will temporarily hold the sheet.

In addition, the polyethylene sheet manufacturing apparatus 100 includes a guide table 84 and a winder 90 disposed in order downstream of the cut-off roll 82, the guide table 84 is a molded polyethylene sheet is completed Guide to the winder 90, the winder 90 performs the function of winding the polyethylene sheet.

Hereinafter, a method for manufacturing a polyethylene sheet according to a preferred embodiment of the present invention with reference to the accompanying drawings.

When the polyethylene support material is added to the hopper 10 in order to manufacture the polyethylene sheet, the injected resin is melted through the extruder 20 and the melted resin is supplied to the T-die 40 via the gear pump 30. The sheet spreads out widely.

The resin that has passed through the T-die 40 passes through the cold forming rolls 50 by the pulling action of the primary and secondary pull rolls 60 and 80. At this time, the resin is introduced between the lower roll 51 and the middle roll 52 to escape between the upper roll 53 while wrapping the outer roll surface 52h of the middle roll 52, as described above The surface is molded into a desired shape while being pressed by the intaglio of the projection portion P and the ground pattern portion B formed on the outer roll surface 52h of the roll 52.

The resin cooled while passing through the cold forming roll 50 undergoes a pinhole detector 62 after passing through the conveyor roll 54 and the primary pull roll 60, and undergoes a non-destructive inspection for the presence of pinholes or defects. When the end is passed through the scanner 70 by the taking action of the secondary pull roll 80 to measure the thickness. Thereafter, the manufacturing process is completed by passing the guide table 84 and winding the sheet in a roll shape by the winder 90. At this time, the sheet is cut to a desired length by the operation of the cutoff roll 82 and a cutter (not shown) disposed downstream thereof.

The invention has been shown and described in connection with a preferred embodiment for illustrating the principles of the invention, but the invention is not limited to the configuration and operation as shown and described. Rather, those skilled in the art will appreciate that many modifications and variations of the present invention are possible without departing from the spirit and scope of the appended claims.

10: Hopper 20: Extruder
30 gear pump 40 T-die
50: cooling forming roll 51: lower roll
52: middle roll 52h: roll surface
52i: roll shell 53: top roll
54: conveyor roll 60, 80: pull roll
62: pinhole detector 70: scanner and scanner roll
82: cut off roll 84: guide table
90: winder P: protrusion
BT: background pattern

Claims (1)

A hopper into which polyethylene support fee is added;
An extruder for melting and extruding the polyethylene support material flowing from the hopper;
A gear pump disposed in a movement path of the molten resin and blocking a vibration and a pressure change generated in the extruder to maintain a constant extrusion amount of the resin;
A T-die for molding a molten resin transferred into the gear pump into a sheet shape;
A cold forming roll composed of a lower roll, an intermediate roll, and an upper roll, for cooling and molding the resin discharged from the T-die into a sheet having a predetermined thickness;
Primary and secondary pull rolls for pulling the polyethylene sheet cold-formed in the cold forming roll;
A conveyor roll disposed between the cooling forming roll and the primary pull roll to convey the polyethylene sheet;
A scanner for measuring the thickness of the polyethylene sheet conveyed through the primary pull roll;
A pinhole detector disposed between the primary pull roll and the scanner to detect pinholes or defects present in the polyethylene sheet by nondestructive inspection; And
Includes; a winder for winding the polyethylene sheet is completed,
The intermediate roll includes a long rod-shaped inner roll and an outer roll, and the outer roll includes a roll surface and a roll shell portion in direct contact with a polyethylene resin, and the roll shell portion is provided on both sides of the outer roll. The roll surface is provided in a relatively wide area at the central portion except for the roll shell portion, and the roll surface is formed of a projection portion and a base pattern portion repeatedly formed in the longitudinal and transverse directions, and the projection portion is It is formed in an intaglio so as to have a truncated cone shape, the base pattern portion is a polyethylene sheet manufacturing apparatus, characterized in that formed intaglio around the projection.

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