KR200492762Y1 - Apparatus for polyethylene sheet - Google Patents

Abstract

A polyethylene sheet manufacturing apparatus is disclosed.
Polyethylene sheet manufacturing apparatus according to an example of the present invention is a hopper into which the polyethylene resin support material; 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 configured to block vibration and pressure fluctuations generated in the extruder to maintain a constant extrusion amount of the resin; T-die for molding the molten resin transmitted through the gear pump into a sheet shape; A cooling molding 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 taking the polyethylene sheet cold-molded from the cooling forming roll; A scanner for measuring the thickness of the polyethylene sheet transferred through the primary pull roll; And a winder for winding the molded polyethylene sheet; wherein the intermediate roll includes an inner roll and an outer roll in a long rod shape, and the outer roll is a roll surface and a roll shell in direct contact with the polyethylene resin. It consists of a portion, the roll shell portion is provided on both sides of the outer roll, the roll surface is provided in a relatively large area on the central portion excluding the roll shell portion, the roll surface in the longitudinal and transverse directions Consisting of a repetitively formed protrusion part and a base pattern part, the protrusion part is formed in an intaglio so as to have a truncated cone shape, and the base pattern part may be formed in an intaglio around the protrusion part.

Description

Polyethylene sheet manufacturing equipment{Apparatus for polyethylene sheet}

The present invention relates to the manufacture of a polyethylene sheet, and more particularly, in manufacturing a sheet using a polyethylene resin as a main material, it is possible to exhibit a non-slip effect by providing a frictional force by forming reliefs on the surface of the polyethylene sheet to be manufactured. It relates to a polyethylene sheet manufacturing apparatus.

Polyethylene is widely used in various fields due to its low price and excellent moldability and physical properties, and is manufactured and used in various shapes according to manufacturing apparatuses and manufacturing methods.

Sheets made of polyethylene as the main material are used for various purposes such as waterproof layer and moisture-proof layer, and are manufactured to have a thickness of approximately 0.25 to 2.5 mm and a width of 0.9 to 1.8 m.

Polyethylene sheets are generally manufactured by a sheet manufacturing apparatus composed of an extruder, a die, a forming roll, a roll table, a trimming roll, a take-up roll, and a cutter.

The polyethylene sheet manufactured by the conventional sheet manufacturing apparatus as described above adopts a method of forming an intaglio pattern on the surface of the sheet attached to the surface of the roll and filling the intaglio pattern with a polymer resin in multiple stages, so that it can effectively exert friction. There is a problem that it is difficult to implement a possible uneven pattern on the surface of the polyethylene sheet.

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

The present invention was devised in view of the above points, and by forming a sheet by forming a sheet by forming an intaglio that can be changed in various designs on the intermediate roll surface of the cooling molding roll of the polyethylene sheet manufacturing apparatus, it effectively increases the friction force on the sheet surface. It is an object of the present invention to provide an apparatus for manufacturing a polyethylene sheet capable of providing an excellent anti-slip effect.

Another object of the present invention is to provide a polyethylene sheet manufacturing apparatus capable of stabilizing the quality of the polyethylene resin produced by maintaining a constant discharge amount of resin by a gear pump and efficiently arranging each component means and further improving the manufacturing efficiency. It is in doing.

Another object of the present invention is to provide a polyethylene sheet manufacturing apparatus capable of improving the quality of the manufactured polyethylene sheet by detecting pinholes or defects that may be included in the manufactured sheet in real time in the manufacturing process by non-destructive testing There is one.

The object of the present invention is not limited to the above, and 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 an apparatus for manufacturing a polyethylene sheet, wherein the apparatus for manufacturing a polyethylene sheet according to an example of the present invention includes a hopper into which a polyethylene resin 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 configured to block vibration and pressure fluctuations generated in the extruder to maintain a constant extrusion amount of the resin; T-die for molding the molten resin transmitted through the gear pump into a sheet shape; A cooling molding 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 taking the polyethylene sheet cooled by the cooling forming roll; A scanner for measuring the thickness of the polyethylene sheet transferred through the primary pull roll; And a winder for winding the molded polyethylene sheet; wherein the intermediate roll includes an inner roll and an outer roll in a long rod shape, and the outer roll is a roll surface and a roll shell in direct contact with the polyethylene resin. It consists of a portion, the roll shell portion is provided on both sides of the outer roll, the roll surface is provided in a relatively large area on the central portion excluding the roll shell portion, the roll surface in the longitudinal and transverse directions Consisting of a repetitively formed protrusion part and a base pattern part, the protrusion part is formed in an intaglio so as to have a truncated cone shape, and the base pattern part may be formed in an intaglio around the protrusion part.

In addition, the present invention is disposed between the cooling molding roll and the primary pull roll conveyor roll for transporting the polyethylene sheet; And a pinhole detector disposed between the primary pull roll and the scanner to detect pinholes or defects present in the polyethylene sheet by non-destructive inspection.

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

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

The horizontal and vertical distances in which the protrusions are repeatedly formed on the roll surface may be set at an interval of 3 mm, and the left and right and vertical distances at which the protrusions and the base pattern portions are repeatedly formed may be set at an interval of 6 mm. .

The T-die may be a coat hanger-type die.

In the case of the present invention as described above, by forming reliefs on the surface of the polyethylene sheet by the protrusions and ground patterns formed repeatedly in the longitudinal and transverse directions on the surface of the intermediate roll of the cooling molding roll, By providing it, a more excellent anti-slip effect can be exhibited. Such a polyethylene sheet can be modified in various ways to suit the intended use, and can provide various physical, mechanical, and chemical properties, thereby satisfying design conditions required in a wide range of applications.

In addition, the present invention 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 component means and further improve the manufacturing efficiency.

In addition, according to the present invention, pinholes or defects that may be included in the sheet to be manufactured can be detected in real time during the manufacturing process by non-destructive testing, so that the quality of the manufactured polyethylene sheet can be improved.

The effects of the present invention are not limited to those described above, and other effects 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 an intermediate roll constituting a part of the cooling forming roll shown in FIG.
3 is a photograph of an actual roll surface of an intermediate roll constituting a part of the cooling forming roll shown in FIG. 1.
4 is a view showing a surface portion of a polyethylene sheet manufactured using the intermediate roll shown in FIG. 3.
5 is an actual photograph showing the surface of the polyethylene sheet manufactured using the intermediate roll shown in FIG. 3.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art may easily implement the embodiments. The present invention may be implemented in a number of different forms and is not limited to the embodiments described herein.

In order to clearly describe the present invention, parts irrelevant to the description are omitted, and the same reference numerals are attached to the same or similar components throughout the specification.

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

Throughout the specification, when a part is said to be "connected" with another part, this includes not only the case of being "directly connected", but also being "indirectly connected" with another member therebetween. In addition, when a part "includes" a certain component, it may mean that other components are not excluded but other components are further included unless otherwise stated.

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

Referring to FIG. 1, a polyethylene sheet manufacturing apparatus 100 according to a preferred embodiment of the present invention melts and extrudes a hopper 10 into which a polyethylene support material is injected, and a polyethylene support material introduced from the hopper 10. It includes an extruder 20 for. It is preferable that the extruder 20 is arranged in parallel with two units.

The polyethylene sheet manufacturing apparatus 100 includes a gear pump 30 disposed downstream of the extruder 20 based on the transport direction of the polyethylene resin, the gear pump 30 being discharged from the extruder 20 It is installed to solve the surginig phenomenon (resin discharge amount non-uniform phenomenon) of the resulting polyethylene resin, and the amount of extrusion is constant by blocking vibration and pressure fluctuations generated by screws (not shown) located in the extruder 20. It performs a function that keeps it healthy.

In addition, the polyethylene sheet manufacturing apparatus 100 includes a T-die 40 disposed downstream of the gear pump 30, the T-die 40 being melted and discharged from the extruder 20. It is arranged to be widely formed into a sheet shape, and is preferably made of a coat hanger-type die. Coat hanger type die is a type of T-die used for sheet extrusion. The cross-sectional area of the central part of the distribution groove for equally distributing the molten plastic material to the manifold inside the die is reduced, and both ends are in the extrusion direction. It is inclined to form a coat hanger. That is, the resin flow path portion inside the die is designed to be extruded by receiving 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, and the cooling forming roll 50 includes a lower roll 51 and an intermediate roll 52. And an upper roll 53, which is a roll for cooling and molding the resin discharged from the T-die 40 into a sheet having a predetermined thickness. Thermal medium oil is circulated inside the cooling molding roll 50 to maintain a predetermined temperature constant.

FIG. 2 is a step-by-step view showing the manufacturing process of an intermediate roll constituting a part of the cooling forming roll, and is a view showing the structure of a textured roll made with a special texture.

2, the intermediate roll 52 includes an elongated rod-shaped inner roll 52a and an outer roll 52b, wherein the inner roll 52a has a heat medium oil inlet at one side and the other side, respectively. A cooling pipe 52c having (W1) and a thermal medium oil discharge port W2 extends in the longitudinal direction, and a mist discharge port 52d is formed at one end of the inner roll 52a. Journals 52e are disposed at the boundary portions on both sides of the inner roll 52a and the outer roll 52b. A jacket chamber 52f is provided radially inside the outer roll 52b surrounding the inner roll 52a, and a spiral fluid circulation pipe 52g for circulating thermal 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 large area in the central portion excluding the roll shell portion 52i.

FIG. 3 is a photograph of the actual roll surface of the cooling-molded 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. This is a picture of the actual surface of a polyethylene sheet manufactured using an intermediate roll.

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

The left and right and vertical distances A in which the protrusions 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 vertical distances B in which the protruding portion P and the base pattern portion BT are repeatedly formed are set at an interval of 4 to 8 mm, preferably 6 mm.

In this way, after forming the protrusion portion P and the ground pattern portion BT on the roll surface 52b of the intermediate roll 52 for cooling molding in an intaglio, chromium (Cr) plating was applied to a thickness of about 30 μm. Through the surface treatment process, the roll surface 52b of the intermediate roll 52 in the final shape as shown in FIG. 3 is obtained.

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

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

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

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 cooled and molded while passing through the cooling forming roll 50. It performs the function of taking out the old sheet.

In addition, the polyethylene sheet manufacturing apparatus 100 includes a cut-off roll 82 disposed downstream of the secondary pull roll 80, and the cut-off roll 82 is a cutter (not shown) to cut the sheet to a desired length. When cutting with ), it temporarily holds the sheet.

In addition, the polyethylene sheet manufacturing apparatus 100 includes a guide table 84 and a winder 90 which are sequentially arranged downstream of the cut-off roll 82, and the guide table 84 comprises a polyethylene sheet that has been molded. It performs a function of guiding toward the winder 90, and the winder 90 performs a function of winding a polyethylene sheet.

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

In order to manufacture a polyethylene sheet, when the polyethylene resin is injected into the hopper 10, the injected resin is melted while passing through the extruder 20, and the melted resin is supplied to the T-die 40 through the gear pump 30. It is spread out in a sheet shape.

The resin passing through the T-die 40 passes through the cooling forming roll 50 by the take-off 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 intermediate roll 52 and escapes through the upper roll 53 while surrounding the outer roll surface 52h of the intermediate roll 52, as described above. The surface is molded into a desired shape while being pressed by the intaglio of the protruding 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 cooling molding roll 50 passes through the conveyor roll 54 and the primary pull roll 60 and then undergoes a non-destructive inspection for the presence or absence of a pinhole or defect while passing through the pinhole detector 62. When finished, the thickness is measured while passing through the scanner 70 by the take-off action of the secondary pull roll 80. After that, the sheet is wound in a roll shape by passing through the guide table 84 and by the winder 90, thereby completing the manufacture. At this time, the sheet is cut to a desired length by the operation of the cut-off roll 82 and a cutter (not shown) disposed downstream thereof.

Above, the present invention has been shown and described in connection with a preferred embodiment for illustrating the principle of the present invention, but the present invention is not limited to the configuration and operation as shown and described as such. Rather, it will be well understood by those of ordinary skill in the art to which the present invention pertains that a number of changes and modifications can be made to the present invention 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: intermediate roll 52h: roll surface
52i: roll shell portion 53: upper 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 part

Claims (1)

Hopper into which the polyethylene resin support material is put;
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 configured to block vibration and pressure fluctuations generated in the extruder to maintain a constant extrusion amount of the resin;
T-die for molding the molten resin transmitted through the gear pump into a sheet shape;
A cooling molding 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 taking the polyethylene sheet cold-molded from the cooling forming roll;
A conveyor roll disposed between the cooling molding roll and the primary pull roll to transfer the polyethylene sheet;
A scanner for measuring the thickness of the polyethylene sheet transferred through the primary pull roll;
A pinhole detector disposed between the primary pull roll and the scanner to detect pinholes or defects in the polyethylene sheet by non-destructive testing; And
Includes; a winder for winding the formed polyethylene sheet,
The intermediate roll includes a long rod-shaped inner roll and an outer roll surrounding the inner roll,
A cooling pipe having a thermal medium oil inlet and a thermal medium oil outlet at one side and the other side, respectively, is extended inside the inner roll,
A mist outlet is formed at one end of the inner roll,
Journals are arranged at the boundary between the inner roll and the outer roll,
A jacket chamber is formed radially inside the outer roll surrounding the inner roll,
A spiral fluid circulation pipe for circulating the thermal medium oil is disposed in the jacket chamber,
The outer roll is composed of a roll surface and a roll shell portion in direct contact with the polyethylene resin,
The roll shell portion is provided on both sides of the outer roll,
The roll surface is provided in a relatively wide area compared to the roll shell portion at a central portion excluding the roll shell portion,
The roll surface is composed of a protruding portion and a ground pattern portion repeatedly formed in the longitudinal and transverse directions,
The protrusion is formed in an intaglio so as to have a truncated cone shape,
The ground pattern portion is a polyethylene sheet manufacturing apparatus, characterized in that formed in an intaglio around the projection portion.

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