JPH11138635A - Embossing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid creating wrinkles and yield no embossing luster unevenness at the time of forming recessed patterns on an olefin resin sheet and manufacturing a decorative sheet. SOLUTION: A sheet is heated little by little by a number of heating rolls 14a-14i, and after passing through the last roll 14i, it is heated abruptly by a short wave length heater 20 to be in a semi-molten state to subsequently be held between the impression cylinder 16 and the embossing roll 17, and concurrently be cooled abruptly. Even in the event of effecting embossing work on an olefin resin sheet having the nature of thermal expansion in the width direction, no wrinkles are created in the direction of flow, and embossing luster unevenness is also never generated thereon.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an embossing method suitable for producing a decorative sheet provided with a concave pattern, particularly a decorative sheet comprising an olefin resin sheet.

[0002]

2. Description of the Related Art In general, as a decorative sheet used as a surface material for building materials and furniture, a sheet using a polyvinyl chloride sheet has been widely used. A decorative sheet using a polyolefin resin sheet has been proposed.

In the case of a polyvinyl chloride resin sheet, an embossing device having a roll arrangement as shown in FIG. 1 is used when manufacturing a decorative sheet having a concave pattern. The case of only the sheet A in FIG. 1 will be described. First, the preheating roll 1 removes wrinkles and slacks, then heats up at once on a high-temperature heating roll 4 and then peels off the heating roll 4 with a Teflon peeling roll 8. Then, after being adjusted to a semi-molten state by the medium-wavelength heater 10, it is sandwiched between the impression cylinder 6 made of silicone rubber and the embossing roll 7, and simultaneously cooled to form a concave pattern. The decorative sheet S is obtained by being peeled off from the embossing roll 7 and cooled by the cooling roll 9. Then, the wrapping embossed sheet and the tripling embossed sheet can be obtained as the decorative sheet S by superimposing the sheets B and C on the sheet A by the bonding roll 5 through the preheating rolls 2 and 3, respectively.

[0004]

Some olefin-based resin sheets have the property of thermally expanding in the width direction. When such a sheet is applied to the above-described embossing device, the sheet expands and wrinkles in the flow direction. Will occur. Also,
When the temperature of the impression cylinder made of silicone rubber becomes high, the sheet is taken up on the impression cylinder side, causing a problem that uneven gloss of the emboss occurs.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to produce a decorative sheet by forming a concave pattern on an olefin-based resin sheet. An object of the present invention is to provide an embossing method that does not occur and does not cause unevenness in embossing.

[0006]

In order to achieve the above object, the embossing method of the present invention heats a sheet little by little by a large number of heating rolls, and after passing the last heating roll, abruptly by a short-wavelength heater. After being heated to a semi-molten state, it is sandwiched between an impression cylinder and an embossing roll and rapidly cooled at the same time.

[0007]

FIG. 2 is a schematic structural view of an embossing device for performing an embossing method according to the present invention. In the figure, sheets D, E, and F are olefin resin sheets, respectively.

First, the case where only the sheet D is used will be described. First, the supplied sheet D is removed of wrinkles and slack by a preheating roll 11 and then a large number of heating rolls 14a to 14
Heated little by little through i. By gradually heating in this way, it is possible to cope with expansion of the sheet D in the width direction. That is, the sheet D is heated by the heating roll 14a.
Although it expands in the width direction by passing through 14i, it is gradually heated and expands little by little in the width direction, so that there is no swelling and wrinkles in the flow direction. As described above, the heating is gradually performed by the plurality of heating rolls 14a to 14i, but is not heated until the heating rolls 14a to 14i are in a semi-molten state.

After passing through the last heating roll 14i, it is rapidly heated by a short-wavelength heater 20 to a semi-molten state, and then a silicone rubber impression cylinder 16 and an embossing roll 17 are formed.
It quenches at the same time as it is sandwiched between, forming a concave pattern.
After that, the decorative sheet S is obtained by peeling off the embossing roll 17 by the peeling roll 18 and cooling by the cooling roll 19. If the sheet D becomes hot in the middle of the plurality of heating rolls 14a to 14i, the sheet D is wound around the heating rolls and becomes difficult to be peeled off. The short wavelength heater 20 is used which is more powerful than the conventional medium wavelength heater. Further, if the temperature of the impression cylinder 16 becomes high, the sheet D may be taken to the impression cylinder 16 side. Therefore, the impression cylinder 16 is cooled by the impression cylinder cooling roll 21 so that the sheet is not taken off.

Further, a double embossed sheet and a triple embossed sheet as the decorative sheet S can be manufactured by laminating the sheets E and F on the sheet D by the bonding roll 15 through the preheating rolls 12 and 13, respectively.

[0011]

According to the embossing method of the present invention, the sheet is heated little by little by a large number of heating rolls, and after passing through the last heating roll, is rapidly heated by a short-wavelength heater to be in a semi-molten state. When sandwiched between the body and the embossing roll, it is configured to cool rapidly, so when embossing an olefin-based resin sheet that has the property of thermally expanding in the width direction to produce a decorative sheet, wrinkles in the flow direction are reduced. No embossing occurs, and no emboss gloss unevenness occurs.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a conventional embossing device.

FIG. 2 is a schematic configuration diagram of an embossing device that performs an embossing method according to the present invention.

[Explanation of symbols]

 A, B, C sheet S decorative sheet 1, 2, 3, 3 preheating roll 4 heating roll 5 laminating roll 6 impression cylinder 7 embossing roll 8 peeling roll 9 cooling roll 10 medium wavelength heater C, D, E sheet S 'decorative sheet 11 , 12 13 Preheating roll 14 a-14 i Heating roll 15 Laminating roll 16 Impression roll 17 Emboss roll 18 Peeling roll 19 Cooling roll 20 Short wavelength heater 21 Impression drum cooling roll

Claims (2)

[Claims] 1. A sheet is heated little by little by a number of heating rolls, and after passing through the last heating roll, is rapidly heated by a short-wavelength heater to a semi-molten state, and then between the impression cylinder and the embossing roll. An embossing method characterized by quenching at the same time as sandwiching. 2. The embossing method according to claim 1, wherein the impression cylinder is cooled by an impression cylinder cooling roll.