KR101796514B1 - Method for manufacturing clear files - Google Patents

Abstract

The present invention relates to a clear file manufacturing method, in which a folded portion of a PET sheet is thin and convex so that it is thin and strong with a PET sheet, and various designs of a customer can be easily implemented with a low cost laser printing, It is also possible to supply the order at low cost and to enhance the product quality.

Description

METHOD FOR MANUFACTURING CLEAR FILES [0002]

The present invention relates to a clear file manufacturing method, and more particularly, to a method for manufacturing an improved clear file made of eco-friendly PET, which is easy to print and has a small thickness and sufficient strength.

Generally, a clear file is used for filing documents or receipts in various sizes and shapes in the office or home. In particular, the name of a file holder, which is formed of a transparent material, such as documents or receipts, And it is widely used as a promotional article.

These clear files were mainly made of polyvinyl chloride (PVC) or polypropylene (PP).

Examples of such a clear file include a cover made of a synthetic resin such as polypropylene and an index clear file having a rectangular parallelepiped shape having fixing means for fixing the documents in the domestic registration office No. 20-0260070 (registered on December 26, 2001) .

In the case of a clear file made of PVC, there is a problem of environmental hormone problem, and there is a problem that the use of various printing methods is limited in that PP can be used only as an offset printing, for example, a relatively thick rectangular shape of about 200 microns And it is difficult to manufacture in the form of a thin sheet, and it is difficult to accommodate the design printing demands of various users. When a custom design was printed on a PP sheet with a conventional laser printer, the toner fixer was not able to withstand a high temperature of 190 to 210 ° C, and deformation occurred.

For this reason, when designing a PP sheet for a customer's demand, it is necessary to use a printing plate (copper plate) for offset printing and offset printing, so that it is necessary to have a production unit of several hundred sheets or more so that a small- There has been a problem that the manufacturing cost is increased and the demand for small quantity of the consumer can not be satisfied.

In order to improve the printability of the surface of the polypropylene film, it is possible to easily print stationery and patterns, and as an improvement measure for realizing printing by applying the inkjet printing method, Korean Patent Publication No. 10-2006-0007717 Discloses a method of manufacturing a polypropylene film, comprising: an adhesive coating step of coating an adhesive on one side of a polypropylene film; A phosphorescent coating step of coating a photoresist after the adhesive coating; A printing step of printing on the surface of the substrate after the printing agent coating; And an enamel coating step of coating the surface with transparent enamel after printing is completed.

However, there has been a problem in that the preprocessing process for the printing method is complicated and the time and cost are increased in order to realize the design print of various orders upon the use of the polypropylene film.

As a means of solving the problems of clear piles of PVC or PP sheet, it is environmentally friendly and highly recyclable and has excellent mechanical strength, thermal characteristics, chemical resistance and moisture resistance, water resistance and transparency, and high quality polyethylene terephthalate (PET ) Sheet is proposed. Particularly, among such PET sheets, surface-treated sheets are marketed so that prints printed on the surface of the sheets are not dropped off to improve printability. Thus, in order to meet the requirements of the purchaser by various printing methods such as laser printing, And the like.

However, PET has a merit that it can be formed into a strong and thin sheet and can be printed by laser printing. However, PET clear file or document holders have a drawback in that they have a large rigidity and tend to bulge in a folded portion, .

In order to reduce the lifting phenomenon of the folding part, an ultrasonic welding machine may be used to join the folding part. However, the ultrasonic welding machine is very expensive and small companies that manufacture clear file for a normal promotional article can not use such an ultrasonic welding machine It is required to provide a method of forming the folding portion so as not to be excited more easily.

Domestic Registration Practice No. 20-0260070 (registered on December 26, 2001) Korean Patent Laid-Open No. 10-2006-0007717 (published Jan. 26, 2006)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of manufacturing a clear file which is improved so as not to be convex at the folded portion of the clear file in order to solve the problems of the clear file of the conventional clear file and the PET sheet.

In order to achieve the above object, a clear file manufacturing method according to the present invention comprises:
A blank sheet shape cutting step S4, a clear file folding part processing step S5, a folding step folding step S6 (step S6), a folding step S6 (S7), and a clear-file lower-end fusing step (S8), the method comprising the steps of:
In the material sheet supply step S1, the PET sheet may be supplied as a clear file material by being unwound from the roll. In the material sheet cutting processing step S2, the supplied material sheet is cut to a unit clear file size, In the printing step S3, a white ink is printed on the rear surface of the cut material sheet so that the printed material printed on the surface of the clear file can be clearly seen so that the contents of the file can not be seen from the outside or in a subsequent step, In the cutting step S4, the material sheet of unit size cut in unit clear file size and white printed on the back surface is cut into a clear file shape. In the clear file folding section processing step S5, And the folded portion is formed by forming a plurality of cut portions at predetermined intervals in a line shape, The formation of the opening portion is performed by pressing the folded portion along the folding position with a cutting member formed with a plurality of toothed portions spaced at predetermined intervals, thereby forming the folding line 51 at regular intervals so that the clear file can be folded, The folded clear file in the sub-folding step S6 is folded around the folded portion due to rigidity of the PET itself. Therefore, in order to make the folded portion flat, the folded portion is subjected to the folding portion heating press machine working step (S7) The folding part 52 is pressed while heating the folding part 52 at a predetermined temperature and pressure at a folding part heating pressing step S7 so that the folding part is kept flat,
In the folding part heating pressing step (S7), the heating temperature is between 70 and 245 占 폚, and the folded part is pressed with a force of 30 to 150 kgf for 0.1 to 3 seconds so that the folded part is maintained in a plastically deformed state,
The folding part heating pressing step S7 is performed by a heating press machine 1 and the heating press machine 1 comprises a jig 10 and a heating press machine 1 disposed at one end of the jig 10, Wherein the jig (10) has a rectangular pitched recessed groove (11) of a clear pile size on its upper surface, the recessed pit (11) has a surface facing the heating press (20) The heating press machine 20 includes a fixed lower heater 21 and an upper heater 21 disposed movably to a position in contact with a position spaced apart from the lower heater 21, 25 and the upper and lower heaters 21 and 25 are provided with heating wires and the respective heaters 21 and 25 are provided with cooling means so that the heaters 21 and 25 are set in advance The change of physical properties of the clear pile of the PET material can be prevented And thus,
The lower heater 21 as a cooling means has a cooling water flow path formed at a lower portion thereof and a heater portion disposed thereon is maintained at a predetermined temperature and a cooling water flow path 26 is formed on the upper portion of the upper heater 25, The cooling water flow channel of the lower heater 21 is configured to be the same as the cooling water flow channel 26 of the upper heater 25,
The lower and upper heaters 21 and 25 of the heating press 20 are supported by the lower and upper holders 30 and 35 respectively and the holders 35 and 30 are supported by the hinge 37 at the opposite end, While the lower heater 21 is fixed while the upper heater 25 is spaced apart from the lower heater 21 by the spring 38. In this case, As the upper holder 30 is pulled downward by the member 39, the upper heater 25 is brought into contact with the lower heater 21 and is folded along the folding line of the clear file disposed therebetween, And when the pulling force of the pulling member 39 is removed, it is returned to the position spaced apart from the lower heater by the spring 38,
The clear file is characterized in that a PET sheet having a thickness of 0.1 mm can be used and the design according to the request of the customer can be printed by the laser printer.
At this time, in the folding part heating pressing step S7, the clear file to be supplied is arranged in the recessed portion 11 of the jig 10, and at the position where the folded portion is directed toward the heating press machine 20, The lower heater 21 is pushed in while the upper heater 25 is spaced apart and the pedal is depressed to pull the pulling member 39 downward to lower the upper heater 25, Presses the folded portion of the clear pile disposed on the lower heater 21 at a predetermined temperature and pressure so that the folded portion of the clear pile of the PET material having a high rigidity is held flat and then held on the pulling member 39 By removing the applied force, the upper heater 25 is raised to the original position spaced apart by the spring 38 and the folded portion is pressed to remove the flat file, And is folded into a folded state.

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According to the clear file manufacturing method of the present invention, the folded portion of the PET sheet is thin and convex so that it can be thin and strong with PET sheet, and it is possible to realize various designs of the customer with low cost laser printing easily and beautifully, It can be supplied at low cost, and the product can be upgraded.

1 is a schematic block diagram of a clear file manufacturing method according to the present invention;
Figure 2 is a schematic perspective view showing the cut-out for the folding part of the clear file of Figure 1;
3 is a perspective view of a clear file in a state in which a clear file is folded along the cut section of FIG. 2;
4 is a perspective view of a clear file produced by heat pressing a folded portion of the clear file of Fig. 3 in a heat press process; Fig.
5 is a schematic perspective view of a heating and pressing apparatus for carrying out the folding part heating press process of FIG.
6 is a schematic side cross-sectional view of the heating and pressing apparatus shown in Fig.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings showing embodiments of a clear file manufacturing method according to the present invention.

1, the clear file manufacturing method of the present invention includes a material sheet supply step S1, a material sheet cutting processing step S2, a back face white printing step S3, a clear file shape cutting step S4, A sub-machining step S5, a folding part folding step S6, a folding part heating pressing step S7, and a clear file lower end fusing step S8.

In the material sheet supply step S1, the PET sheet as a clear file material can be supplied, for example, from a roll. In the material sheet cutting processing step S2, the supplied material sheet is cut into unit clear file sizes.

Then, in step S3, white ink is printed on the rear surface of the cut material sheet so that the printed material printed on the surface of the clear file can be seen clearly so as not to see the contents of the file from the outside or at a subsequent step.

In the clear file cutting step (S4), the clear file shape is cut in the unit size sheet printed in unit clear file size in the step (S3) and white printed on the back side.

Then, the folded portion of the clear file, that is, the folded portion is processed (Step S5). The folded portion processing is performed by forming a plurality of cut portions at predetermined intervals in a line shape. The cut-out portion is formed by forming a cut-out line 51 at regular intervals by pressing the cut-out portion along the folding position with a cut-out member having a plurality of teeth spaced at predetermined intervals as schematically shown in FIG. 2 The clear file can be easily folded.

In step S5, a folded portion is formed in a line-shaped cut portion, and then the folded file is folded in half in the folding portion folding step S6.

In the clear file folded in the folding step S6, since the rigidity of the PET is large and the folded clear file is in a state of being convexly raised around the folding part 52 as shown in Fig. 3, You need to make it.

For this purpose, the folded portion is subjected to a heat press process. In the folding part heating pressing step S7, the folded part 52 in which the clear file is folded is pressed while being heated at a preset temperature and pressure, and the folded part is kept flat as shown in FIG. 4, thereby completing the clear file.

In the folding part heating pressing step (S7), the heating temperature is preferably 70 to 245 DEG C as a temperature range until the physical properties of the PET are changed, and plastic deformation occurs at a temperature lower than 70 DEG C It is not kept flat at the folded portion and is excited, and it is preferable that the PET melting point is lower than 245 ° C. At this time, by pressing for 0.1 to 3 seconds with a force of 30 to 150 kgf, the folded portion of the PET clear pile is maintained in a flat plastic deformed state, and the pressing force and the pressing time are selected according to the heating temperature. That is, when the heating temperature is high, the pressing force can be made small and the pressing time can be shortened. When the heating temperature is relatively low, the pressing force and the pressing time are preferably long. By folding the folded portion of the clear pile made of PET by such heating temperature, pressing force, and pressing time, the folded portion can be plastically deformed and kept flat.

The folding part heating pressing step S7 is carried out by the heating press machine 1 schematically shown in Figs.

The heating and pressing apparatus 1 includes a jig 10 and a heating press 20 disposed at one end thereof. The jig 10 has a rectangular pitched groove 11 having a clear file size formed on the upper surface thereof and a side of the pitched groove 11 facing the side of the heating press 20 is opened, Respectively.

The heating press machine 20 includes a fixed lower heater 21 and an upper heater 25 movably disposed at a position in contact with a position spaced apart from the lower heater 21. The lower and upper heaters 21 And 25 are provided with heating wires. In addition, each of the heaters is provided with cooling means at the upper portion thereof to keep the heaters in a predetermined temperature range, thereby preventing a change in the physical properties of the clear material of the PET material.

A cooling water flow path (not shown) is formed in a lower portion of the lower heater 21 to keep the heater portion at a predetermined temperature, and a cooling water flow path 26 is formed in an upper portion of the upper heater 25, So that the heater unit disposed at the lower side thereof is maintained at a predetermined temperature. The cooling water flow path of the lower heater 21 is also preferably the same as the cooling water flow path 26 of the upper heater 25. [

The lower part of the heating press 20 and the upper heaters 21 and 25 are supported by the lower and upper holders 30 and 35 respectively as shown in FIG. 37 and the lower heater is fixed while the upper heater is separated by the spring 38 against the lower heater by the pulling member 39 schematically shown in the drawing during the folding operation and the upper holder 30 The upper heater is brought into contact with the lower heater to perform folding heating along the fold line of the clear pile disposed therebetween. When the pulling force of the pulling member 39 is removed, And is returned to the position spaced apart from the lower heater by the spring 38. [

The pulling member 39 may be mechanically or hydraulically actuated by a pedal as shown in Fig. It may also be configured to operate at constant time intervals by the motor.

In Figs. 5 and 6, first, the clear file supplied by the operator is placed in the recessed groove 11 of the jig 10, with the folded portion directed toward the heating press.

Then, the upper heater (25) is pushed into the fixed lower heater (21) while the upper heater (25) is separated, and the pedal is pulled downward to lower the upper heater to place the upper heater on the lower heater The folded portion of the clear file is pressed at a predetermined temperature and pressure so that the folded portion of the clear pile of PET material having high rigidity is folded and held flat.

Then, by removing the force applied to the pulling member, the clear file is lifted to the original position spaced apart by the spring and the end is folded to remove the flat file, so that the clear file is completely folded as shown in Fig. ≪ / RTI >

The PET clear pile is used as a PET sheet having a thickness of about 0.1 mm, so that the entire clear pile can be very thin and excellent in transparency and can be easily printed by a laser printer, In addition, superior print quality can be achieved to enhance product quality and enable small-scale sales promotion companies to easily respond to small orders.

The present invention can be used for the manufacture of clear piles of PET materials.

1: heating press machine 10: jig
11: recessed portion 20: heating press
21: Lower heater 25: Upper heater
51: a fold line 52: a fold portion

Claims (5)

A blank sheet shape cutting step S4, a clear file folding part processing step S5, a folding step folding step S6 (step S6), a folding step S6 ), A folding part heating pressing step (S7), and a clear file lower end fusing step (S8)
In the material sheet supply step S1, the PET sheet may be supplied as a clear file material by being unwound from the roll. In the material sheet cutting processing step S2, the supplied material sheet is cut to a unit clear file size, In the printing step S3, a white ink is printed on the rear surface of the cut material sheet so that the printed material printed on the surface of the clear file can be clearly seen so that the contents of the file can not be seen from the outside or in a subsequent step, In the cutting step S4, the material sheet of unit size cut in unit clear file size and white printed on the back face is cut into a clear file shape. In the clear file folding portion processing step S5, And the folded portion is formed by forming a plurality of cut portions at predetermined intervals in a line shape, The formation of the opening portion is performed by pressing the folded portion along the folding position with a cutting member formed with a plurality of toothed portions spaced at predetermined intervals, thereby forming the folding line 51 at regular intervals so that the clear file can be folded, In the sub-folding step S6, the folded clear file is convexly folded about the folded portion due to the rigidity of the PET itself. Therefore, in order to flatten the folded portion, The folded portion 52 is pressed while being heated to a preset predetermined temperature and pressure to keep the folded portion flat,
In the folding part heating pressing step (S7), the heating temperature is between 70 and 245 占 폚, and the folded part is pressed with a force of 30 to 150 kgf for 0.1 to 3 seconds so that the folded part is maintained in a plastically deformed state,
The folding part heating pressing step S7 is performed by a heating press machine 1 and the heating press machine 1 comprises a jig 10 and a heating press machine 1 disposed at one end of the jig 10, Wherein the jig (10) has a rectangular pitched recessed groove (11) of a clear pile size on its upper surface, the recessed pit (11) has a surface facing the heating press (20) The heating press machine 20 includes a fixed lower heater 21 and an upper heater 21 disposed movably to a position in contact with a position spaced apart from the lower heater 21, 25 and the upper and lower heaters 21 and 25 are provided with heating wires and the respective heaters 21 and 25 are provided with cooling means so that the heaters 21 and 25 are set in advance The change of physical properties of the clear pile of the PET material can be prevented And thus,
The lower heater 21 as a cooling means has a cooling water flow path formed at a lower portion thereof and a heater portion disposed thereon is maintained at a predetermined temperature and a cooling water flow path 26 is formed on the upper portion of the upper heater 25, The cooling water flow channel of the lower heater 21 is configured to be the same as the cooling water flow channel 26 of the upper heater 25,
The lower and upper heaters 21 and 25 of the heating press 20 are supported by lower and upper holders 35 and 30 respectively and the holders 35 and 30 are supported by the hinge 37 at the opposite end, While the lower heater 21 is fixed while the upper heater 25 is spaced apart from the lower heater 21 by the spring 38. In this case, As the upper holder 30 is pulled downward by the member 39, the upper heater 25 is brought into contact with the lower heater 21 and is folded along the folding line of the clear file disposed therebetween, And when the pulling force of the pulling member 39 is removed, it is returned to the position spaced apart from the lower heater by the spring 38,
Wherein the clear file is a PET sheet having a thickness of 0.1 mm, and a design according to a customer's request can be printed by a laser printer.
The method according to claim 1,
The folding part heating pressing step (S7)
A clear file to be supplied is disposed in the recessed portion 11 of the jig 10 and the upper heater 25 is fixed to the fixed lower heater 21 at a position where the folded portion is directed toward the heating press machine 20 The upper heater 25 is lowered by pulling the pulling member 39 downward by stepping on the pedal so that the upper heater 25 is moved to the side of the clear file The folded portion is pressed to a preset temperature and pressure so that the folded portion of the clear pile of the rigid PET material is held flat and then the force applied to the pulling member 39 is removed, The clearance of the clear file which is flattened due to the rise of the heater 25 to the original position spaced apart and the folded portion being pressed is removed so that the clear file is completely folded in the folded state Control file method.
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