JP5167574B2 - Embossed sheet manufacturing method and embossed sheet manufacturing apparatus - Google Patents

Description

  The present invention relates to an embossed sheet manufacturing method and a manufacturing apparatus thereof.

  Conventionally, it has been widely practiced to produce an embossed sheet having excellent design properties by embossing the surface of a sheet-shaped original fabric.

  As a method and apparatus for producing this embossed sheet, generally, a sheet-shaped raw material such as a synthetic resin sheet is heated, and this is inserted between an embossing roll and a pressure roll and continuously pressed. And devices are known.

  Moreover, in the method and apparatus using such an embossing roll and a pressure roll, an embossing roll and a pressure roll are considered in view of the surface temperature of these two rolls rising with the heat | fever from a sheet-like original fabric. The cooling is done in some way.

  Specifically, for example, in Patent Document 1, for the purpose of producing an embossed sheet with high accuracy and high efficiency, both the embossing roll and the pressure roll have a space for cooling water formed therein, Inject cooling water into the space to prevent the temperature rise of these surfaces, and provide a cooling roll so as to press the surface of the pressure roll, and pressurize separately from the cooling from the inside of the roll Cooling the surface of the roll is disclosed.

  Further, for example, Patent Document 2 discloses that the embossing roll and the pressure roll are both immersed in cold water for the same purpose as that of the Patent Document.

  However, Patent Document 1 mentions that the surface temperature difference between the embossing roll and the pressure roll is large (see paragraph (0005) of Patent Document 1), and as a means for solving this problem. That is, it is disclosed that the surface of the pressure roll is cooled by the cooling roll in order to reduce the surface temperature difference between the embossing roll and the pressure roll.

Moreover, even if it is not specified in Patent Document 2, it is judged from the fact that the embossing roll and the pressure roll are immersed in the same cooling pan. It is thought that it aims at making the surface temperature difference of a roll small.
JP-A-8-118469 Japanese Patent Laid-Open No. 11-207913

  The present invention has been made in such a situation, and with the idea completely different from the above-mentioned Patent Documents 1 and 2, the embossing sheet has a higher embossing accuracy than the prior art and can be manufactured at a high speed. It is a main object to provide a method and a manufacturing apparatus.

  In order to solve the above-mentioned problem, the first invention of the present application is to insert and press a heated sheet-like raw fabric between an embossing roll and a pressure roll on which a predetermined shaping uneven pattern is applied. Thus, a method for producing an embossed sheet by forming a concavo-convex pattern on the sheet-shaped raw fabric, the surface temperature of the pressure roll being maintained at a temperature lower by 30 ° C. or more than the surface temperature of the embossing roll The present invention relates to a method for manufacturing an embossed sheet.

  In the said invention, the hardness of the surface of the said pressure roll shall be 85 degree | times or more by the value measured by H method prescribed | regulated to JISK6253 (the hardness test method of a vulcanized rubber and a thermoplastic rubber). It is preferable.

  Moreover, in the said invention, it is preferable that the thickness of the sheet-like original fabric to be used shall be 400 micrometers or more.

  In order to solve the above problems, a second invention of the present application comprises: an embossing roll provided with a predetermined shaping uneven pattern; and an impression cylinder roll disposed substantially parallel to the embossing roll. Further, the present invention relates to an embossed sheet manufacturing apparatus, wherein the pressure roll is provided with a cooling means for maintaining the surface temperature at a temperature lower by 30 ° C. or more than the surface temperature of the embossing roll.

  In the above invention, even if the hardness of the surface of the pressure roll is 85 degrees or more as measured by the H method specified in JIS K6253 (vulcanized rubber and thermoplastic rubber hardness test method). Good.

  The invention of the present application is made from a viewpoint completely different from the conventional embossed sheet manufacturing method and manufacturing apparatus. Specifically, the surface temperature of the pressure roll is 30 ° C. or higher than the surface temperature of the embossed roll. Since the surface temperature of the pressure roll is maintained so as to be low, the sheet raw material inserted and pressed between the embossing roll and the pressure roll is shaped into the pressure roll after being shaped. Prevents the so-called “embossing return (the shape once formed returns to its original shape)” that occurs when the original sheet is pulled because it is peeled immediately from the surface of the pressure roll without being pulled. As a result, an embossed sheet can be produced with higher accuracy than in the past.

  Further, by setting the hardness of the surface of the pressure roll to 85 degrees or more as measured by the H method defined in JIS K6253 (a hardness test method for vulcanized rubber and thermoplastic rubber), for example, an insert The present invention can be used even when manufacturing an embossed sheet having a thickness of 400 μm or more used for automobile interior parts formed by a molding method.

  Below, the manufacturing method of the embossed sheet of this invention is demonstrated in detail using drawing, and the method of this invention is also demonstrated collectively.

  FIG. 1 is a configuration diagram of an embossed sheet manufacturing apparatus according to the present invention.

  In the figure, reference numeral 1 is an embossed sheet, 2 is a clear original fabric, 3 is a printed original fabric, 4 is a sheet-shaped original fabric, 5 is an embossed recess, 10 is an embossing manufacturing apparatus, 11 and 12 are preheating rolls, 13 Is a bonding nip roll, 14 is a heating drum, 15 is a heating roll, 16 is a heating heater, 17 is an embossing roll, and 18 is a pressure roll. And the code | symbol 19 in a figure represents the cooling means for hold | maintaining the surface temperature of the pressure roll 18 30 degreeC or more lower than the surface temperature of the embossing roll 17, 20 is a cooling roll, 21 is a backup roll, respectively. Represents.

  As shown in FIG. 1, the apparatus of the present invention is provided with a preheating roll 11 for heating the clear original fabric 2 and a preheating roll 12 for heating the printed original fabric 3. A heating drum 14, a bonding nip roll 13, and a backup roll 21 are disposed on the downstream side. Between the heating drum 14 and the laminating nip roll 13, the clear original fabric 2 and the printed original fabric 3 that are heated and laminated with each other are allowed to enter, so that both the original fabrics are thermocompression-bonded. To form.

  On the downstream side of the heating drum 14, heating rolls 15 for heating the sheet-shaped original fabric 4 are sequentially disposed, and the sheet-shaped original fabric 4 is interposed between the heating roll 15 and the embossing roll 17 disposed downstream thereof. A heater 16 is provided for heating the two sides from both sides. Further, on the downstream side of the heating roll 15, an embossing roll 17 provided with an uneven pattern for shaping is provided for performing predetermined embossing on the sheet-shaped raw material 4, and is substantially parallel to the embossing roll 17. A pressure roll 18 is disposed on the surface. In addition, the space for cooling water is formed in the embossing roll 17 and the pressure roll 18 like the conventional apparatus, and cooling water may be inject | poured into the said space. This is to prevent the surface temperatures of the embossing roll 17 and the pressure roll 18 from exceeding a presumed temperature.

  The sheet material 4 is heated by the heating drum 14 and the heating roll 15 and is heated by the heater 16 from both sides. The sheet-shaped original fabric 4 is inserted between the embossing roll 17 and the pressure roll 18 and is pressed between the embossing roll 17 and the pressure roll 18 so that the surface of the sheet-shaped original fabric 4 is embossed. Is done.

  Here, in the apparatus of the present invention, the cooling means 19 for maintaining the surface temperature of the pressure roll 18 at a temperature lower than the surface temperature of the embossing roll 17 by 30 ° C. or more adjacent to the pressure roll 18. Is provided.

  The cooling means 19 may be any means that can achieve the above-described action, and the present invention is not particularly limited. For example, as shown in FIG. 1, an embossing roll thermometer 19 a for measuring the surface temperature of the embossing roll 17, a pressure roll thermometer 19 b for measuring the surface temperature of the pressing roll 18, and actually A cooling water tank 19c filled with cooling water for lowering the surface temperature of the pressure roll 18 and a temperature difference between the respective surface temperatures are calculated from the temperatures measured by the two thermometers, and the cooling water tank The cooling means 19 may be composed of a personal computer 19d that controls the positional relationship of 19c with respect to the pressure roll 18 and a moving device 19e that moves the cooling water tank. According to the cooling means 19, the two thermometers 19a and 19b and the personal computer 19d can grasp the surface temperature of each roll and the temperature difference between them in almost real time. When the temperature is likely to be lower than or equal to 0 ° C. (that is, when the surface temperature of the pressure roll 18 rises and approaches the surface temperature of the embossing roll 17), the moving means 19e connected to the personal computer 19d operates and cools. By bringing the water tank 19c close to the pressure roll 18 and increasing the contact area between the pressure roll 18 and the cooling water, the surface temperature of the pressure roll 18 can be lowered. Thereby, the difference of the surface temperature of the embossing roll 17 and the pressurization roll 18 can always be hold | maintained at 30 degreeC or more (refer FIG. 2).

  The cooling means 19 shown in FIG. 1 is merely an example. In short, it is sufficient that the temperature rise of the pressure roll is suppressed and the temperature can always be kept at 30 ° C. or lower than the surface temperature of the embossing roll. Instead of the water tank 19c, a cold air device that injects cold air onto the surface of the pressure roll 18 may be used.

  Thus, by making the surface temperature of the pressure roll 18 lower by 30 ° C. or lower than that of the embossing roll 17, the embossed sheet-shaped original fabric (embossed sheet 1) is smoother than the pressure roll 18. Then, the film is guided to the cooling roll 20 on the downstream side, where it is cooled to complete the embossing.

  Here, as the pressure roll 17 used in the method and apparatus of the present invention, a conventionally known one may be appropriately used, and is not particularly limited, but the surface hardness is JIS K6253 (vulcanized rubber). And a value measured by the H method specified in the hardness test method of thermoplastic rubber) is preferably 85 degrees or more, particularly preferably 90 degrees or more. As will be described later, the method and apparatus of the present invention can be suitably used for a sheet-shaped raw material 4 having a thickness of 400 μm or more. However, when embossing is formed on such a thick sheet-shaped raw material 4 This is because a pressure roll having such a surface hardness is suitable.

  Moreover, there is no limitation in particular about the sheet-like original fabric 4 embossed in the method and apparatus of this invention. For example, as the colored original fabric 31 of the clear original fabric 2 and the printed original fabric 3 shown in FIG. 1, vinyl chloride, vinylon, ethylene-vinyl acetate copolymer, nylon, polyethylene, polypropylene, ABS, acrylic resin Etc. are used. Further, although there is no limitation on the thickness of the sheet, in the method and apparatus of the present invention, a sheet-like raw fabric 4 having a thickness of 400 μm or more can be particularly preferably used. It can be suitably used as an automobile interior part formed by an insert molding method.

FIG. 1 is a configuration diagram of an embossed sheet manufacturing apparatus according to the present invention. It is a figure for demonstrating the cooling means of the apparatus shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Embossed sheet 2 ... Clear original fabric 3 ... Printed original fabric 4 ... Sheet-shaped original fabric 10 ... Embossing manufacturing apparatus 11, 12 ... Preheating roll 13 ... Lamination nip roll 14 ... Heating drum 15 ... Heating roll 16 ... Heating heater 17 ... Embossing roll 18 ... Pressure roll 19 ... Cooling means 20 ... Cooling roll 21 ... Backup roll

Claims (7)

By inserting and pressurizing the heated sheet-shaped original fabric between an embossing roll and a pressurizing roll on which a predetermined irregularity pattern for shaping is formed, the concave-convex pattern is formed on the sheet-shaped original fabric. A method of manufacturing an embossed sheet,
The sheet-shaped original fabric has a clear original fabric and a printed original fabric,
A method for producing an embossed sheet, wherein the surface temperature of the pressure roll is maintained at a temperature lower by 30 ° C. or more than the surface temperature of the embossing roll.   The hardness of the surface of the pressure roll is 85 degrees or more as measured by the H method defined in JIS K6253 (a hardness test method for vulcanized rubber and thermoplastic rubber). 2. A method for producing an embossed sheet according to 1.   The thickness of the said sheet-like original fabric is 400 micrometers or more, The manufacturing method of the embossed sheet of Claim 1 or 2 characterized by the above-mentioned. Using a cooling water tank filled with cooling water and a moving device for moving the cooling water tank,
4. A part of said pressure roll is immersed in the said cooling water tank by moving a cooling water tank with a moving apparatus, The said pressure roll is cooled by this, The any one of Claim 1 to 3 characterized by the above-mentioned. The manufacturing method of the embossed sheet of item. An embossed sheet manufacturing apparatus for embossing a sheet-shaped original fabric having a clear original fabric and a printed original fabric into an embossed sheet,
An embossing roll provided with a predetermined uneven pattern for shaping;
A pressure roll disposed substantially parallel to the embossing roll,
The embossing sheet manufacturing apparatus, wherein the pressure roll is provided with a cooling means for maintaining the surface temperature at a temperature lower by 30 ° C. or more than the surface temperature of the embossing roll. The hardness of the surface of the pressure roll is 85 degrees or more as measured by the H method defined in JIS K6253 (a hardness test method for vulcanized rubber and thermoplastic rubber). 5. An apparatus for producing an embossed sheet according to 5. A cooling water tank filled with cooling water;
A moving device for moving the cooling water tank;
The cooling water tank is moved by the moving device so that a part of the pressure roll is immersed in the cooling water tank, and thereby the pressure roll is cooled. Embossed sheet manufacturing equipment.

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