KR101959563B1 - Manufacturing Method of Laminate Tube and a Laminate Tube Manufactured by the Same - Google Patents

Abstract

The present invention relates to a method for manufacturing a laminate tube. The purpose of the present invention is to provide a method for manufacturing a laminate tube, capable of improving printing quality by performing thermal transfer printing on a laminate tube. According to the present invention, the method for manufacturing a laminate tube comprises the following steps: manufacturing a sheet by bonding a base material to an adhesive resin by an extruding lamination method; continuously forming a cylindrical tube by forming both left and right ends in a cylindrical shape to overlap in a predetermined width on the predetermined length of the sheet and bonding both the left and right ends by fusion of ultrasonic waves; continuously coating a synthetic resin which is fused on the entire outer circumference of the cylindrical tube in a predetermined thickness or less; cooling the cylindrical tube coated with the fused synthetic resin; cutting the cylindrical tube in a predetermined length; performing the thermal transfer printing by pressing heat transfer paper on which a pattern to be printed on the cylindrical tube is printed, to the cylindrical tube inserted into a first roller by a second roller including an outer circumference heater after inserting the cylindrical tube which is cut into the first roller, and by rotating the second roller to rotate the first roller one time while heating the second roller at same time; performing a shoulder forming process on one end of the cylindrical tube completed with the thermal transfer printing; performing a lid sealing process on the cylindrical tube completed with the shoulder forming process; and performing a capping process on the cylindrical tube completed with the lid sealing process.

Description

TECHNICAL FIELD The present invention relates to a laminate tube manufacturing method and a laminate tube manufacturing method.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminate tube, and more particularly, to a laminate tube widely used as a cosmetic article such as toothpaste, cosmetics and the like or a container for sanitary articles and a method of manufacturing the same.

Toothpaste and other hygienic products, cosmetics, foodstuffs and medicines to be used as a container for a variety of products, mainly PE (polyethylene) as the main material can be divided into PE tubes and laminate tubes.

PE tubes are mainly made of LDPE, that is, low density PE, and contain functional resins to meet the physical properties required according to the product specifications. Depending on the characteristics of the contents of the tube, it may be formed into a multi-layered tube having chemical resistance, barrier properties, bonding properties, and the like. For example, two layers of LDPE can be adhered with an ADMAR layer as an adhesive to form a three-layer structure tube. An EVAL layer as an oxygen barrier is added between two LDPE layers, and an adhesive layer ADMAR layer may be added to form a five-layer structure tube.

The laminate tube is manufactured by forming a PE film and a laminated sheet by using a highly gas-barrier material such as a high-order plastic film (EVOH) or an aluminum foil or a ceramic coating film, and then performing a process such as tubing, injection molding, It is made through. Laminate tubes are used as containers for toothpaste, medicines, etc. in addition to cosmetics because they have excellent functionalities such as oxygen barrier, ultraviolet shielding, and moisture barrier. Especially, it is said that it is suitable as a hair treatment product such as hair dye, perm medicine, and hand cream.

As an example of the laminate tube, the outermost print layer and the innermost inner storage layer are formed of a linear low density polyethylene (L-LDPE) layer, and a layer of polyester (PET), aluminum foil, ceramic coating polyester (ABL), CBL (Ceramic Barrier Laminate), PBL (PBL), and the like, depending on the composition of the barrier layer. Plastic Barrier Laminate).

The flexible tube made of the laminate is used as a paste for various toothpaste materials, foods and ointments, and is generally manufactured by extrusion lamination to adhere a base material to an adhesive resin to form a sheet And then the sheet is cut into a sheet or a roll and the finished tube is made through a printing process and a seal process for forming a cylinder and then a seal is made after the filling of the final contents It functions as such.

In the case of monochromatic printing or simple color printing of about 2 to 3 degrees, a tube printing machine with a cylinder-shaped offset printing method is used to perform a printing operation There are many.

However, in the case where printing of a complex pattern of more various colors is required or printing of a photograph is required, a printing operation can not be performed by a printing plate offset printing machine, and a printing pattern is transferred to the outside of a cylindrical tube using a thermal transfer paper .

In this case, generally, the cylindrical tube is formed by fusing in a side-sealing manner, and a step portion having a height difference is formed with a fused portion interposed therebetween, so that a pattern print formed by pressing and heating a thermal transfer paper on a cylindrical tube, It may not be smoothly performed or there may be a problem in the print quality.

It is an object of the present invention to provide a method of manufacturing a laminated tube capable of further improving print quality in thermal transfer printing on a laminated tube.

Another object of the present invention is to provide a method of manufacturing a laminated tube capable of improving the user's experience of using a product contained in the laminated tube by minimizing the bending of the periphery of the laminated tube after the thermal transfer printing.

According to an aspect of the present invention, there is provided a method of manufacturing a laminated tube, comprising: preparing a sheet by adhering a base material to an adhesive resin by an extrusion lamination method; Forming a cylindrical tube so that both ends of the sheet are overlapped with each other by a predetermined width with respect to a predetermined length of the sheet, and adhering the portions having the left and right opposite ends to each other by ultrasonic welding to form a cylindrical tube continuously; Continuously coating molten synthetic resin on the entire circumference of the cylindrical tube to a predetermined thickness or less; Cooling the cylindrical tube coated with the molten synthetic resin; Cutting the cylindrical tube by the predetermined length; The cut cylinder tube is sandwiched between the first rollers and the thermal transfer paper on which the pattern to be printed is printed on the cylindrical tube is pressed onto the cylindrical tube fitted to the first roller by a second roller having an outer circumferential surface heated heater Performing thermal transfer printing on the cylindrical tube by rotating the second roller such that the first roller rotates once while heating the second roller; Performing a shoulder forming process on one end of the cylindrical tube having completed thermal transfer printing; Performing a lead sealing process on the cylindrical tube having completed shoulder-shaping; And performing a capping process on the lead-sealed cylindrical tube, wherein the step of coating the molten synthetic resin with respect to the entire circumference of the outer circumference of the cylindrical tube to a predetermined thickness or less includes: A resin injection port is formed on one side of the outer cylinder, a resin heater is provided on a rear end of the outer cylinder, and an arc-shaped resin discharge is formed on the innermost side of the rear end of the outer cylinder, Continuously injecting molten synthetic resin into the resin injection port of the resin coater with a slit so as to form a predetermined pressure by the melted synthetic resin in the outer cylinder; Further heating the molten synthetic resin at the rear end of the outer cylinder by the resin heating heater to further lower the viscosity of the molten synthetic resin; Injecting the cylindrical tube into the inner cylinder at the front end of the resin coater and discharging through the rear end of the resin coater; And discharging the further heated molten synthetic resin through the resin discharging slit to adhere to and coat the outer circumferential surface of the cylindrical tube discharged through the rear end of the resin coater.

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Also, the molten synthetic resin is selected from LDPE or LLDPE, the heating temperature of the resin heating heater is set to 250 占 폚, and the width of the resin discharging slit is 0.1 mm.

According to the method of manufacturing a laminated tube according to the present invention as described above, it is possible to minimize a stepped portion formed at the time of manufacturing a cylindrical tube by side sealing, thereby minimizing the printing defects in the vicinity of the stepped portion have.

In addition, since the steps of the stepped portion are minimized, the stepped portion is not prominent to a user using the product contained in the laminate tube, so that it is possible to give a feeling of smooth touch feeling as if the tube is made by an extrusion method instead of a side sealing method.

1 is a flowchart showing a method of manufacturing a laminated tube according to the present invention.
2 is a view schematically showing a thermal transfer printing machine used for manufacturing a laminated tube according to the present invention.
3 is a view schematically showing a resin coater used for manufacturing a laminate tube according to the present invention.
FIG. 4 is a rear end view of a resin coater used for manufacturing a laminated tube according to the present invention, viewed from direction A in FIG.
5 is a rear end view of a resin coater formed according to another embodiment of the present invention.

Hereinafter, a method of manufacturing a laminated tube according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a flow chart showing a method of manufacturing a laminated tube according to the present invention, and FIG. 2 is a view schematically showing a thermal transfer printing machine used for manufacturing a laminated tube according to the present invention.

In order to produce a laminate tube, a sheet is first prepared by adhering a base material to an adhesive resin by an extrusion lamination method. Typically, such a sheet is rolled or stored in a roll form or prepared for the next step (S110).

Subsequently, the sheet is formed into a cylindrical tube by superimposing the left and right ends over each other by a side sealing process (S120). The side sealing process can be performed by ultrasonic welding. In the side sealing step, the sheet, which is usually prepared in the form of a roll, is unwound from a roll, and then formed into a cylindrical shape so that both left and right ends of the sheet are overlapped with a predetermined length (corresponding to the length of the finished tube) And the portions where the left and right ends are overlapped by ultrasonic welding are mutually adhered, whereby the cylindrical tube can be continuously formed (the cylindrical tube is cut later by the predetermined length). It is preferable that the ultrasonic welding is performed at a time by the predetermined length. Continuous production of the cylindrical tube is enabled by a friction feed mechanism (not shown) by an opposing belt which pulls the side-sealed tubular tube. Since such a side sealing process can be carried out by a known technique, a detailed description will be omitted.

As described above, in the case of forming the cylindrical tube by the side sealing method, the stepped portions 110 having different heights are formed on one side of the cylindrical tube by the overlapping portions of the left and right ends of the sheet, ) May adversely affect the quality of the thermal transfer printing described later.

Next, the molten synthetic resin is continuously coated on the entire circumference of the cylindrical tube to a predetermined thickness or less (S130). More details regarding the process of coating the molten synthetic resin on the outer surface of the cylindrical tube will be described later.

The cylindrical tube that has been coated with the molten synthetic resin needs to be cooled before performing cutting (S140). The cooling process may be performed by air cooling, water cooling, or a combination of air cooling and water cooling. Water cooling can be carried out, for example, by spraying a cylindrical tube over the water bath. Alternatively, the cylindrical tube may be immersed directly in a water bath to cool it. After the cooling process by water cooling, it is preferable to perform the drying process until the water on the surface of the cylindrical tube is completely dried. The drying process may be performed by blowing the controlled dry air toward the cylindrical tube so that the humidity is very low by the dehumidifier, or by passing the cylindrical tube through the inside of the chamber filled with the dry air. Considering the average amount of water droplets adhering to the cylindrical tube, the temperature of the work site, and the humidity during the process until the cylindrical tube is transferred by the cutting process after the cooling process, the cylindrical tube can be naturally dried The drying step may be omitted if the drying can be carried out at a level which is at least not problematic for carrying out the cutting process.

When the coated cylindrical tube is sufficiently cooled, it is cut by the predetermined length corresponding to the length of the finished tube (S150).

As a result, the cylindrical tube was ready to be put into the printing process. In the laminate tube manufacturing method according to the present invention, printing is performed by a thermal transfer printing method (see Fig. 2).

In order to perform the thermal transfer printing, first, the cut cylindrical tube 100 is put on the first roller 310, and the thermal transfer paper 390 printed with the pattern to be printed on the cylindrical tube 100 is inserted into the third The roller 330 is inserted. The thermal transfer paper, which is typically made in the form of a roll, is unwound from the third roller 330 and passes between the second roller 320 and the first roller 310 as described later.

The thermal transfer paper 390 is pressed onto the cylindrical tube 100 fitted to the first roller 310 by the second roller 320 having the outer circumferential surface heater 325 incorporated therein. The second roller 320 heats the thermal transfer paper 390 by the built-in outer circumferential surface heater 325 so that the pattern printed on the thermal transfer paper 390 is separated from the thermal transfer paper 390, As shown in FIG. The second roller 320 is pressed against the first roller 310 to allow the thermal transfer printing to be performed on the entire circumference of the cylindrical tube 100, So that the first roller 310 makes one rotation by the rotation of the second roller 320 while closely adhering to the cylindrical tube 100. Thus, the printing of the pattern of the thermal transfer paper to be printed on one cylindrical tube 100 is completed (S160).

After the thermal transfer printing is completed, the thermal transfer paper may be wrapped around a fourth roller (not shown) provided separately and then discarded. Alternatively, the thermal transfer paper on which the thermal transfer printing has been completed may fall toward the waste transfer paper collecting unit (not shown) provided at the lower side.

As described above, in the cylindrical tube 100 in which the synthetic resin coating and the thermal transfer printing have been completed, the steps of the stepped portion 110 formed by the side sealing can be somewhat relaxed, so that the feeling of use due to the touch of the user can be improved.

In addition, there is an advantage that the deficiency of the thermal transfer printing can be reduced in the vicinity of the stepped portion by alleviating the stepped portion.

Further, since the stepped portion of the stepped portion is relaxed, the start portion and the end portion of the thermal transfer printing can be smoothly connected to each other, so that the information about the product to be printed on the outer surface of the tube, the image for publicity, There is an advantage.

After completion of the thermal transfer printing, a shoulder molding process is performed on one end of the cylindrical tube in the same manner as a conventional tube manufacturing process (S170). When the shoulder molding is completed, a lead sealing process is performed (S180) After completion, the capping process is performed (S190).

Then, it is supplied to manufacturers of toothpaste and cosmetics through an inspection process and a packaging process.

Hereinafter, the resin coater 200 used for manufacturing the laminate tube of the present invention will be described.

FIG. 3 is a view schematically showing a resin coater used for manufacturing a laminate tube according to the present invention, and FIG. 4 is a rear view of a resin coater used for manufacturing a laminate tube according to the present invention, FIG.

The resin coater 200 comprises an inner cylinder 210 and an outer cylinder 220 formed to be mutually isolated. In one embodiment, the inner passageway may be formed concentrically, but is not limited to this shape.

A resin injection port 223 is formed at one side of the outer cylinder to supply synthetic resin melted from the outside. The resin injection port 223 may be formed at any position in the front, center, or rear of the outer cylinder 220. However, the outer cylinder may uniformly discharge the molten synthetic resin through the resin discharge slit 227 at a constant pressure It is preferable to be formed at the center. The resin injection port 223 may be formed anywhere on the upper, lower, side, or the like of the outer cylinder 220. However, it is preferable that the resin injection port 223 is formed on the upper side considering the downward flow effect of the molten synthetic resin due to gravity. However, since the molten synthetic resin can be supplied from the outside to the resin injection port by the screw feeder, that is, the screw conveyor 230, the flow effect by gravity is not so large.

As the molten synthetic resin, various kinds of plastics can be used. For example, LDPE or LLDPE can be used in consideration of the characteristics of a product such as PE, especially a tube.

The cylindrical tube 100 formed by the side sealing is inserted into the inner tube 210 so that the cylindrical tube 100 discharged after the side sealing is inserted into the inner tube 210, (Not shown) and the resin coater 200 are aligned with each other. The power to input the cylindrical tube 100 into the inner tube 210 may be provided by a friction feed mechanism by the opposing belt disposed in the side sealing process. Alternatively, the power may be provided by a pair of opposing rollers (not shown). As another example, the power may be provided by a guide or wall (not shown) located opposite the one roller (not shown).

A resin heater 225 is provided at the rear end of the outer cylinder 220. The rear end of the outer tube 220 is a place where the molten synthetic resin is discharged (the front end of the outer tube is closed), and the rear end of the inner tube 210, into which the cylindrical tube 100 inserted into the front end of the inner tube 210, And is located just outside the end portion. The molten synthetic resin to be injected into the outer cylinder 220 is heated to about 150-200 ° C and injected. In order to form a thin film through the resin discharging slit 227 to be described later and uniformly discharge the resin to a predetermined thickness, It is preferable to be heated to 250 ° C. When the molten synthetic resin is further heated, the viscosity becomes lower and the fluidity becomes larger, which is advantageous for forming a thinner film, and is also advantageous for evenly discharging the film to a constant thickness.

If there is a possibility that a phenomenon that the outer cylinder 220 has a thin thickness or that the molten synthetic resin injected on the front side of the outer cylinder is rapidly cooled to cause a hardening phenomenon, A heater 225 may be provided.

The inner cylinder 210 and the outer cylinder 220 of the resin coater 200 are integrally formed so as to be isolated from each other, but only the rear end of the outer cylinder 220 may be provided so as to communicate with each other by the resin discharge slit 227 .

That is, the resin discharge slit 227 may be formed along the entire circumference of the inner circumferential surface of the rear end of the outer cylinder 220. However, in order to allow the resin discharge slit 227 to be supported, the resin discharge slit 227 is formed into an arc shape divided into three to five peripheries around the entire circumference of the inner circumferential surface of the outer cylinder. The resin discharge slit 227 may be formed with a width of about 0.05-0.5 mm depending on the required coating thickness. However, the molten synthetic resin formed as a thin film by the resin discharging slit 227 may become thicker again as the flow rate slows down depending on the flow characteristics after passing through the resin discharging slit 227, The width of the resin discharge slit 227 should be set.

When the molten synthetic resin is injected through the resin injection port 223 of the outer cylinder 220 to fill the inside of the outer cylinder with the molten synthetic resin and then the molten synthetic resin is further injected into the outer cylinder, a predetermined pressure is applied to the molten synthetic resin inside the outer cylinder By this pressure, the molten synthetic resin is discharged onto the outer circumferential surface of the cylindrical tube 100 through the resin discharge slit 227. If the amount of the molten synthetic resin continuously injected through the resin injection port 223 is adjusted in consideration of the amount of the molten synthetic resin discharged through the resin discharge slit 227, So that the molten resin discharged as a thin film through the resin discharge slit 227 can be uniformly discharged to a predetermined thickness. The molten synthetic resin near the rear end of the outer cylinder is further heated by the resin heating heater 225 to lower the viscosity. However, this is only a local change, and the molten synthetic resin lowers the numerical value of the pressure formed inside the outer cylinder And even if a pressure drop occurs, the difference will be insignificant.

When the outer tube 220 is ready for discharging the molten synthetic resin, the cylindrical tube 100 is inserted into the inner tube 210 at the front end of the resin coater 200, Respectively. At the same time, the molten synthetic resin is adhered to the outer circumferential surface of the cylindrical tube 100 discharged through the rear end of the resin coater 200 by discharging the molten synthetic resin, which is heated further, through the resin discharging slit 227 Thereby forming a coating.

As described above, since the resin discharge slit 227 is formed in an arc shape divided into three to five sections along the circumference of the inner circumferential surface of the outer cylinder, the molten synthetic resin discharged through the resin discharge slit 227 is also divided into three to five Like shape. However, since the molten synthetic resin immediately after discharging is still high in temperature and has a low viscosity and high fluidity, it spontaneously cleaves the gap between the 3-5 separated strips. As a result, the coating on the outer surface of the cylindrical tube has no seam along the circumferential direction And is formed as a smooth coated surface.

In order to relieve the stepped portion 110 formed by the side sealing, the molten synthetic resin discharge through the resin discharge slit 227 is provided with the stepped portion 110, It is preferable that the cylindrical tube 100 is inserted into the inner cylinder 210 so that the upper side (the side further projecting radially outward) of the cylinder tube 100 is located lower than the lower side. More preferably, the cylindrical tube 100 is inserted into the inner cylinder 210 so that the boundary between the upper and lower sides of the stepped portion 110 is positioned within a range of 30 to 80 degrees with respect to the vertical axis. When the step 110 is positioned within this angular range, the coating surface formed by the molten synthetic resin can be formed in a smooth curved shape connecting the upper side and the lower side of the step portion, The step difference is minimized. One example of the stepped portion 110 formed in this angular range is shown in Figs. 4 and 5. Fig.

The step S130 of coating the molten synthetic resin to a predetermined thickness or less around the entire circumference of the cylindrical tube 100 using the resin coater 200 may be divided into the following steps.

A resin injection port is formed on one side of the outer cylinder, a resin heating heater is provided on a rear end of the outer cylinder, and a resin heating heater is disposed on the innermost rear end of the outer cylinder to form a 3- The melted synthetic resin is continuously injected into the resin injection port of the resin coater having the circular arc shaped resin discharge slit formed by dividing into five portions so that a predetermined pressure by the molten synthetic resin is formed inside the outer cylinder Step S133,

(S135) further lowering the viscosity of the melted synthetic resin by further heating the melted synthetic resin at the rear end of the outer cylinder by the resin heating heater,

(S137) of injecting the cylindrical tube into the inner cylinder at the front end of the resin coater and discharging through the rear end of the resin coater, and

(S139) of discharging the further heated molten synthetic resin through the resin discharge slit and attaching and coating the outer circumferential surface of the cylindrical tube discharged through the rear end of the resin coater.

Hereinafter, with reference to FIG. 5, a resin coater according to an embodiment other than FIG. 4 will be described.

5 is a rear end view of a resin coater formed according to another embodiment of the present invention.

The rear end of the resin coater 200 of FIG. 5 is formed at the innermost portion of the rear end of the outer cylinder 220 instead of being formed on the inner circumferential surface of the rear end of the outer cylinder 220. The thickness of the coating thin film is limited by the clearance between the cylindrical tube 100 and the inner circumferential surface of the inner cylinder 210 in addition to the resin discharge slit 227. In addition, when the resin discharge slit 227 is formed on the inner circumferential surface of the rear end portion of the outer cylinder 220, It may be difficult to appropriately adjust the thickness of the coating thin film by adjusting the size of the resin discharge slit 227. [

The outer cylinder 220 and the inner cylinder 210 of the resin coater 200 are completely isolated from each other and only when the resin discharge slit 227 is formed at the innermost part of the rear end of the outer cylinder 220, (Along the advancing direction of the cylindrical tube).

On the other hand, in this case, when the molten synthetic resin discharged through the resin discharge slit 227 reaches the outer peripheral surface of the cylindrical tube 100, a situation may occur where the resin is cooled more than in the embodiment of FIG. This is because the resin discharge slit 227 is exposed to the outside more than the embodiment of FIG. Therefore, in consideration of this point, the set temperature of the resin heater 225 may need to be slightly increased.

While the present invention has been particularly shown and described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It should be noted that it is determined by description.

100: Cylindrical tube
200: resin coater 210: inner cylinder
220: outer tube 223: resin injection port
225: Resin heating heater 227: Resin discharging slit
230: Screw conveyor
310: first roller 320: second roller
325: outer circumferential surface heating heater 330: third roller
390: Thermal transfer

Claims (4)

A method of making a laminate tube,
Bonding the base material to the adhesive resin by an extrusion lamination method to produce a sheet;
Forming a cylindrical tube so that both ends of the sheet are overlapped with each other by a predetermined width with respect to a predetermined length of the sheet, and adhering the portions having the left and right opposite ends to each other by ultrasonic welding to form a cylindrical tube continuously;
Continuously coating molten synthetic resin on the entire circumference of the cylindrical tube to a predetermined thickness or less;
Cooling the cylindrical tube coated with the molten synthetic resin;
Cutting the cylindrical tube by the predetermined length;
The cut cylinder tube is sandwiched between the first rollers and the thermal transfer paper on which the pattern to be printed is printed on the cylindrical tube is pressed onto the cylindrical tube fitted to the first roller by a second roller having an outer circumferential surface heated heater Performing thermal transfer printing on the cylindrical tube by rotating the second roller such that the first roller rotates once while heating the second roller;
Performing a shoulder forming process on one end of the cylindrical tube having completed thermal transfer printing;
Performing a lead sealing process on the cylindrical tube having completed shoulder-shaping; And performing a capping process on the cylindrical tube in which lead sealing has been completed,
Wherein the step of coating the molten synthetic resin with respect to the entire circumference of the cylindrical tube to a predetermined thickness or less includes:
Wherein a resin injection port is formed at one side of the outer cylinder, a resin heater is provided at a rear end of the outer cylinder, and a resin heater is provided at the innermost rear end of the outer cylinder at three to five Continuously injecting melted synthetic resin into the resin injection port of the resin coater provided with the split circular arc shaped resin discharge slit so as to form a predetermined pressure by the melted synthetic resin in the outer cylinder;
Further heating the molten synthetic resin at the rear end of the outer cylinder by the resin heating heater to further lower the viscosity of the molten synthetic resin;
Injecting the cylindrical tube into the inner cylinder at the front end of the resin coater and discharging through the rear end of the resin coater; And
Further comprising the step of discharging the further heated molten synthetic resin through the resin discharging slit and attaching and coating to the outer circumferential surface of the cylindrical tube discharged through the rear end of the resin coater. Gt; delete The method according to claim 1,
Wherein the molten synthetic resin is selected from LDPE or LLDPE,
The heating temperature of the resin heater is set to 250 캜,
Wherein a width of the resin discharge slit is 0.1 mm. A laminate tube produced by the method of claim 1 or 3.

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