JP2007296824A - Method of precise transfer for forming film sheets, and its precise transferring apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve highly precise transfer by improving the transferring property when a fine pattern is transfered to the surface of film sheets by an engraving roll whose surface is finely engraved. <P>SOLUTION: A patterned film sheet S is molded by supplying a molten synthetic resin material between the engraving roll 3 whose surface is attached with a transfer pattern and a pressed molding roll 10. At this time, the outermost surface of the engraving roll 3 is heated by a heating part 4 placed in a start position of pressed molding between this engraving roll 3 and the pressed molding roll 10, and cooled in an end position of the pressed molding. The heating part 4 heats the pressed molding position of the outermost surface of the engraving roll 3 roughly at the same temperature as the melting temperature of the molten synthetic resin material. The pressed molding roll 10 engages a pressed belt 13 circulating mutually between a pair of driving rollers 11 and 12 positioned on the outermost peripheral face of the engraving roll 3 by abutting on the outermost peripheral face of the engraving roll 3. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention provides a precision transfer method for molding film sheets, which can accurately transfer and form various fine uneven patterns on the surface of film sheets having a predetermined thickness using a synthetic resin material in a molten state and the precision thereof. The present invention relates to a transfer device.

Conventionally, when film sheets having a predetermined thickness are formed, a molten synthetic resin material is supplied from a T die between, for example, paired forming rolls and stretched by pressing the forming rolls. Yes. Further, in forming in such a manner, by controlling the heating of the forming roll, the surface defects of the film sheets that become thin films are corrected, the quality is ensured, the thickness is adjusted, and the like. For example, there are a belt-type resin molding method and apparatus according to Patent Document 1, a sheet manufacturing method and sheet manufacturing apparatus according to Patent Document 2, a thermoplastic resin sheet manufacturing method according to Patent Document 3, and the like.
Japanese Patent Laid-Open No. 7-276297 JP-A-8-118386 JP 2002-120248 A

  In the above-mentioned conventionally proposed apparatus and method, in Patent Document 1, only the molten resin to be supplied is heated, and in Patent Document 2, a constant temperature holding device that maintains the molding drive belt at the time of molding at a high temperature. In Patent Document 3, it is assumed that at least both end portions of the non-contact surface of the thermoplastic resin sheet in contact with the finishing roll are heated. Therefore, although these are effective when the film sheets to be molded have a smooth surface, they are not necessarily effective when a fine engraving pattern is applied to the surfaces of the film sheets.

  That is, in order to mold film sheets having a fine pattern on the surface, the molten synthetic resin material is cooled until it reaches the molding roll in the air while being supplied from the T die to the molding roll. In particular, the surfaces of the film sheets are first cooled, making it difficult to transfer fine sculptures. In order to solve this problem, the synthetic resin material melted from the T-die is supplied to the forming roll, and in order to form film sheets with a fine pattern, the pressure between the forming rolls is improved to improve the transferability of the film sheet. To increase the transfer rate. However, if this is done, the forming roll itself will bend and transfer unevenness will also occur.

  Therefore, the present invention was created in view of the conventional circumstances as described above, the purpose of which is to transfer the fine pattern on the surface of the film sheet by the engraving roll having a fine engraving on the surface, An object of the present invention is to provide a precision transfer method for forming film sheets and the like, and a precision transfer apparatus thereof, which can transfer with good accuracy and high transferability.

In order to solve the above-described problems, in the precision transfer method for molding film sheets according to the present invention, a molten synthetic resin is provided between an engraving roll 3 having a transfer pattern on the surface and a press-molding roll 10. When the material is supplied and the film sheet S with a pattern is formed, the outer surface of the engraving roll 3 is heated at the press molding start portion of the engraving roll 3 and the press molding roll 10 and at the end portion of the press molding. It is in cooling.
In the precision transfer device for molding film sheets according to the present invention, a molten synthetic resin material is supplied between the engraving roll 3 having a transfer pattern on the surface and the press molding roll 10, and the pattern is transferred. The engraving roll 3 is provided with a heating unit 4 at a site where the molten synthetic resin material is formed and pressed together with the press forming roll 10.
The heating unit 4 is configured to heat the press-molded portion on the outer surface of the engraving roll 3 to substantially the same temperature as the melting temperature of the molten synthetic resin material.
The press forming roll 10 hangs between a pair of drive rollers 11, 12 arranged so as to be positioned on the outer peripheral surface of the engraving roll 3 and a press band 13 that circulates in contact with the outer peripheral surface of the engraving roll 3. It consists of

In the precision transfer method for film sheet molding and the precision transfer apparatus according to the present invention configured as described above, the engraving roll 3 whose surface is heated by the heating unit 4 at substantially the same temperature as the molten synthetic resin material is When the molten synthetic resin material is pressed together with the press molding roll 10, the fine pattern on the surface of the engraving roll 3 is precisely transferred to the molten synthetic resin material without cooling the molten synthetic resin material.
The press-molding roll 10 for bringing the circulating pressing band 13 into contact with the outer peripheral surface of the engraving roll 3 is curved along the engraving roll 3, and the molten synthetic resin material is brought into contact with the outer peripheral surface of the engraving roll 3 and continuously formed. In addition, the outer surface of the engraving roll 3 that is cooled as it forms while abutting securely fixes the fine pattern on the film sheet S.

  Since the present invention is configured as described above, when the film sheet S is formed by press-molding the molten synthetic resin material together with the press-molding roll 10 by the engraving roll 3 whose surface is finely engraved. The fine pattern can be transferred to the surface of the film sheet S with high accuracy and precision.

  That is, in the present invention, the engraving roll 3 is provided with the heating unit 4 at a portion where the molten synthetic resin material is molded and pressed together with the press molding roll 10, and the engraving roll 3 and the press molding roll 10 are arranged on the outer surface of the engraving roll 3. This is because heating is performed at the start portion of the press molding and cooling is performed at the end portion of the press molding. As a result, the molten synthetic resin material supplied in the molten state is not cooled, and it is possible to eliminate the occurrence of difficulty in transferring the fine pattern due to cooling and solidification in advance. Can be improved.

  Moreover, the heating to the pressing part of the outer surface of the engraving roll 3 by the heating unit 4 is performed at a temperature substantially the same as the melting temperature of the molten synthetic resin material, so that the engraving roll 3 is applied to the synthetic resin material in an optimal molten state. Can start transcription. The precision of fine pattern transfer can be further improved due to the continuous pressing of the press molding roll 10 on the surface of the engraving roll 3 by the circulating pressing band 13 and the natural cooling of the outer surface of the engraving roll 3 accompanying this pressing.

  In addition, the code | symbol attached | subjected in the means for solving said subject, and each item of the effect of invention was attached | subjected in order to make easy reference with the part which shows each structure part described in drawing. The present invention is not limited to the structure and shape indicated by the reference numerals in the drawings.

  The best mode for carrying out the present invention will be described below with reference to the drawings. Reference numeral 1 shown in the drawing is a base base, and the base base 1 has a fine pattern formed by molding a molten synthetic resin material supplied from a T die 2 storing a molten synthetic resin material. An engraving roll 3 that forms the attached long film sheet S and a press forming roll 10 that presses the molten synthetic resin material together with the engraving roll 3 are rotatably supported.

  The supply port of the T die 2 is located immediately above the pressing portion where the engraving roll 3 and the press molding roll 10 face each other. On the outer peripheral surface of the engraving roll 3, a fine pattern to be imparted to the melted synthetic resin material to be stretch-formed is formed in an uneven shape. A heating unit 4 for heating the outer peripheral surface of the engraving roll 3 is disposed in the vicinity of the pressing portion of the engraving roll 3 with the press forming roll 10 so as to be close to and away from the engraving roll 3. Note that the fine engraving on the surface of the engraving roll 3 has a depth of, for example, about 10 to 20 μm, but is not limited to this.

  The heating unit 4 is, for example, a far infrared heater, a hot air fan, or the like, and the temperature thereof is appropriately controlled by a temperature controller. In addition, the heating unit 4 itself has a structure such as an air cylinder mechanism, a rack and pinion, a feed screw, etc., so that the position of the engraving roll 3 is adjusted by a positioning mechanism 5 that moves up and down, for example, and the temperature controller is controlled. At the same time, the heating temperature for the engraving roll 3 is controlled. The heating of the engraving roll 3 by the heating unit 4 is preferably set to a temperature substantially the same as that of the molten synthetic resin material at a portion where the molten synthetic resin material is pressed together with the press molding roll 10 in the engraving roll 3. The temperature setting at this time may be a temperature range in which the fine pattern on the surface of the engraving roll 3 is reliably transferred without cooling the molten synthetic resin material, and is set at a higher temperature than at least the temperature to be cooled. .

  The engraving roll 3 itself is temperature-controlled by the roll temperature adjusting means 6 and is set and adjusted to a predetermined temperature by a heat medium such as water or oil circulating inside and outside the engraving roll 3. Then, after the surface of the engraving roll 3 is heated by the heating unit 4, it is cooled from the inside to the roll temperature control temperature by the roll temperature adjusting means 6 while being pressed together with the press forming roll 10, and to the final position where the pressing action is applied. Are sequentially cooled. Further, the engraving roll 3 itself rotates, so that the pressing portion with the press forming roll 10 is reheated at the position of the heating unit 4.

  When the engraving roll 3 gives a fine pattern to the molten synthetic resin material, the press molding roll 10 supports the back side of the molten synthetic resin material and forms a predetermined fine pattern on the front side. The press forming roll 10 shown in the figure circulates in contact with the outer peripheral surface of the engraving roll 3 in a curved shape between a pair of drive rollers 11 and 12 arranged so as to be positioned on the outer peripheral surface of the engraving roll 3. It is formed by looping a pressing band 13 such as a loop, sleeve, drum, belt or the like. This pressing band 13 is flexible, and when it is circulated between the driving rollers 11 and 12 arranged above and below, the pressing band 13 is applied to the outer peripheral surface side of the engraving roll 3 with a predetermined moving distance. In contact therewith, the engraving roll 3 supports the fine pattern transfer action on the molten synthetic resin material from the back side of the molten synthetic resin material. In addition, this press molding roll 10 can also be made into a general mere roller shape, without providing the press band 13 which circulates like illustration.

  Reference numeral 15 in the figure denotes a press adjusting mechanism comprising, for example, an air cylinder, a hydraulic mechanism, etc., arranged behind the press forming roll 10 so as to adjust the pressing force by moving the press forming roll 10 closer to or away from the engraving roll 3. It is.

  After the film sheet S is formed by the engraving roll 3 and the press forming roll 10, the film sheet S is finished and formed by the forming roll 21 that is pressed against the engraving roll 3 at a position in front of the engraving roll 3. In the figure, reference numeral 22 designates a cooling for finishing comprising, for example, an air cylinder, a hydraulic mechanism or the like disposed in front of the molding roll 21 so as to adjust the molding pressing force by moving the molding roll 21 toward or away from the engraving roll 3. It is a pressing adjustment mechanism.

  Next, an example of the use of this will be described. A molten synthetic resin material, which is a predetermined film sheet material, is supplied so as to be dropped from the T die 2 onto the outer peripheral surface of the engraving roll 3 in a strip shape. The outer peripheral surface of the engraving roll 3 supplied with the molten synthetic resin material is heated by the heating unit 4 to substantially the same temperature as the molten synthetic resin material, so that the fine pattern on the surface of the engraving roll 3 is pressed into the molten synthetic resin material. Transfer is performed together with the supporting pressing force by the roll 10. The engraving roll 3 has a heated transfer surface after the start of transfer to the melted synthetic resin material, and is adapted to the concavo-convex pattern on the surface of the engraving roll 3, and after the start of transfer, the roll temperature adjusting means 6 reaches a predetermined roll temperature control temperature. Cool gradually. When the pressing force with the press forming roll 10 is released, the film sheet S is formed by fixing the transfer pattern at the lowered temperature. Next, the engraving roll 3 and the forming roll 21 are sequentially cooled and wound on a predetermined roll.

It is a schematic side view showing the best mode for carrying out the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS S ... Film sheet 1 ... Base base 2 ... T die 3 ... Engraving roll 4 ... Heating part 5 ... Positioning mechanism 6 ... Roll temperature adjustment means 10 ... Press molding roll 11,12 ... Drive roller 13 ... Press belt 15 ... Press adjustment Mechanism 21 ... Forming roll 22 ... Cooling pressure adjustment mechanism

Claims (4)

  When a molten synthetic resin material is supplied between the engraving roll having a transfer pattern on the surface and a press-molding roll to form a patterned film sheet, the outer surface of the engraving roll is pressed against this engraving roll. A precision transfer method for molding film sheets, wherein heating is performed at a start portion of press molding with a forming roll, and cooling is performed at an end portion of press molding.   A precision transfer device for film sheet molding that supplies a melted synthetic resin material between a sculpture roll having a transfer pattern on its surface and a press molding roll, and forms a film sheet with the pattern, A precision transfer device for molding film sheets, wherein the engraving roll is provided with a heating portion at a site where the molten synthetic resin material is molded and pressed together with the press molding roll.   The precision transfer device for molding film sheets according to claim 2, wherein the heating unit heats the press-molding portion on the outer surface of the engraving roll to a temperature substantially equal to a melting temperature of the molten synthetic resin material. 4. The press forming roll is formed by winding a press band that circulates in contact with the outer peripheral surface of the engraving roll between a pair of driving rollers arranged vertically on the outer peripheral surface of the engraving roll. 2. Precision transfer device for molding film sheets.

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