JPH04312848A - Manufacture of laminated sheet and its device - Google Patents

Abstract

PURPOSE:To provide the technique and device to laminate a thermal plastic resin sheet and a thermal adhesive resin film without impairing the smoothness, gloss and previously printed data on the surface of the resin film, and also the technique and device to obtain a laminated film by thermally adhering a thermal plastic resin sheet with a lower softening point than a thermal adhesion temperature to the resin film. CONSTITUTION:This laminated sheet is manufactured using a manufacturing device equipped with a heating roll (1), a cooling roll (2) installed at a position specifically distant from the heating roll, a smooth surfaced endless metal belt (3) hooked between the heating roll and the cooling roll, and nip rolls (4, 5) which adhere thermal adhesive resin film and thermal plastic resin sheet in a stacked state under pressure in a distance in which the metal belt moves from the heating roll to the cooling roll.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention particularly relates to a method and apparatus for producing a laminated sheet with a smooth surface and high gloss.

0002

[Prior Art] Conventionally, laminated sheets have been provided in which a polystyrene-based thermoplastic resin sheet and a thermobondable resin film are laminated by heat welding, but these sheets are simply pressed between heated rolls and welded. The surface of the resin film of the laminated sheet as a product expands and contracts unevenly during heat welding and cooling, causing minute irregularities and loss of gloss, as well as the resin film being manufactured by simply cooling naturally. There was a problem in that the printed patterns, characters, etc. that had been applied in advance to the printer were distorted.

[0003] Furthermore, when using an olefin sheet as a base material, even if a printed film is directly thermally bonded to the olefin sheet, since the softening point of the olefin sheet is lower than the temperature required for thermal bonding, some kind of resin layer is required in the middle. It was not possible to obtain a good product without intervening.

0004

[Problems to be Solved by the Invention] When manufacturing containers for packaging products, especially containers for foodstuffs, etc., sheets with excellent surface gloss are suitable in order to give an impression of freshness of the contents. Such a sheet has the advantage that printing appears clearly. The present invention has been made based on the above-mentioned viewpoints, and its purpose is to be applicable not only to polystyrene resin sheets but also to resin sheets such as olefin sheets, and in particular, to have a smooth surface and a glossy surface. It is an object of the present invention to provide a method and apparatus capable of producing a novel laminated sheet that is rich in color and does not impair the beautiful printing previously done.

[0005]

[Means for Solving the Problems] In order to achieve the above object, in the present invention, a thermoplastic resin sheet and a thermobondable resin film are overlapped and heated, and when bonding, the resin film is A metal belt having a sufficiently smooth surface is brought into contact with the surface, and while moving in the same direction at the same speed, the metal belt is heated on the upstream side of the moving direction, and a predetermined distance is left downstream from the heated part. cooling the metal belt at the position,
The resin film and the thermoplastic resin sheet laminated thereon are separated from the surface of the metal belt to obtain a laminated sheet. By making this metal belt endless, a laminated sheet with a particularly smooth surface and high gloss can be continuously produced.

The above object also includes a heating roll, a cooling roll provided at a predetermined distance from the heating roll, and an endless metal with a smooth surface stretched between the heating roll and the cooling roll. A lamination characterized by comprising: a belt; and a nip roll that presses a thermally bondable resin film and a thermoplastic resin sheet in a stacked state in a section where the metal belt moves from a heating roll to a cooling roll. Achieved by sheet manufacturing equipment.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings. In this specification, the term "belt" includes not only ordinary endless belts but also thin-walled rolls, endless track-shaped belts, and the like. 1 to 3 are explanatory views showing outlines of different embodiments of an apparatus for manufacturing a laminated sheet according to the present invention.

In FIG. 1, 1 is a heating roll, 2 is a cooling roll, 3 is an endless metal belt stretched between the heating roll 1 and the cooling roll 2, and 4 and 5 are the heating roll 1 and the cooling roll 2, respectively. A nip roll exerts a pressing force toward the cooling roll 2; 6 is a frame that holds the heating roll 1 and the nip roll 4; 7 is a frame that holds the cooling roll 2 and the nip roll 5; 8 acts in a direction to separate the frames 6 and 7. An extrusion spring, 9 a slide base on which the frame 7 is slidably mounted in the horizontal direction, 10 a long thermoplastic resin sheet, and 11 a resin film that can be thermally bonded to the thermoplastic resin sheet.

In the above-mentioned manufacturing apparatus, the heating roll 1 and the cooling roll 2 rotate at the same speed in the clockwise direction in the figure, and as a result, an endless metal belt 3 is wound around them.
is designed to run at a constant speed. metal belt 3
The outer surface of is given a smooth mirror finish, and the process of being heated by a heating roll 1 and being cooled by a cooling roll 2 is repeated. resin film 11
and the thermoplastic resin sheet 10 are continuously supplied in a form sandwiched between the metal belt 3 on the heating roll 1 side and the nip roll 4. In that case, the thermoplastic resin sheet 10 is supplied so as to be in contact with the nip roll 4, and the resin film 11 is supplied so as to be in contact with the heated metal belt 3, and is pressed by the nip roll 4.
It is then sent to the position of the nip rolls 5 and cooled, and then separated from both rolls and wound up on a suitable winding drum or the like.

In the above heating and pressing process, the thermoplastic resin sheet 10 and the resin film 11 are thermally bonded together, and the surface of the resin film 11 that is brought into close contact with the surface of the mirror-finished metal belt 3 is smoothed and sufficiently smoothed. It gives a glossy shine. The frames 6 and 7 are separated from each other by the action of the extrusion spring 8 and the action of the slide table 9. During the operation, the metal belt 3 is kept in a constant state of tension, and when it loosens, it is separated from the resin film 11. This prevents the adhesion from being impaired.

The manufacturing apparatus shown in FIG. 2 differs from the apparatus shown in FIG. 1 in that the nip roll 5 is pressed against the cooling roll 2, in that the laminated sheet is taken up by a pair of nip rolls 5a, 5a, and an auxiliary roll is 5b increases the contact area between the laminated sheet and the outer periphery of the cooling roll 2, thereby ensuring adhesion between the thermoplastic resin sheet 10 and the resin film 11. In this case, it is recommended that the feeding speed of the nip rolls 5a, 5a be slightly higher than the feeding speed of the heating rolls 1 and nip rolls 4 to maintain the taut state of the laminated sheet.

The manufacturing apparatus shown in FIG. 3 is such that an auxiliary roll 5c is provided between the heating roll 1 and the cooling roll 2 to ensure adhesion between the thermoplastic resin sheet 10 and the resin film 11. be. Even in this case, it is recommended that the feeding speed of the nip rolls 5a, 5a be slightly higher than the feeding speed of the heating rolls 1 and nip rolls 4 to maintain the tension of the laminated sheet.

[0013] According to the manufacturing apparatus configured as described above, the thermoplastic resin sheet 10 and the thermobondable resin film 11 are laminated, and the surface of the resin film is provided with sufficient smoothness and gloss. A laminated sheet according to the present invention can be manufactured. Examples in which a laminated sheet according to the present invention was manufactured using the above-mentioned manufacturing apparatus will be listed below.

Example-1 Materials used As thermoplastic resin sheet: PP sheet
Thickness: 0.8mm As a resin film: Printed CPP film
Thickness: 0.03mm
(Ink containing chlorine-based PP is used as printing ink.
use. Ink adhesion thickness: 0.5 to 2 μ) Thermal bonding conditions (Place the PP sheet on the printed surface of the CPP film and apply it using the above manufacturing equipment.
Heating roll temperature: 160℃ Cooling roll temperature: 70℃ Belt speed: 3.5m/min

Characteristics of laminated sheets as products

Adhesive strength: 100g/cm

Surface roughness: 1μm or less
(Sufficient gloss and adhesive strength similar to conventional

was gotten. )

Example-2 Materials used As thermoplastic resin sheet: PP foam sheet
Thickness: 8.0mm As a resin film: Printed OPP film Thickness: 0.025mm
(Ink containing chlorine-based PP is used as printing ink.
use. Ink adhesion thickness: 0.5 to 2μ) Thermal bonding conditions (overlap the PP sheet on the printed surface of the OPP film and use the above manufacturing equipment to
Heating roll temperature: 160℃ Cooling roll temperature: 80℃ Belt speed: 1.5m/min

Characteristics of laminated sheets as products

Adhesive strength: 80g/cm

Surface roughness: 1μm or less
(Sufficient gloss and adhesive strength similar to conventional

was gotten. )

Example-3 Materials used As thermoplastic resin sheet: PP foam sheet
Thickness: 0.12 mm As a resin film: CPP film Thickness: 0.0
3 mm Thermal bonding conditions Heating roll temperature: 160°C Cooling roll temperature: 60°C Belt speed: 4.0 m/min

Characteristics of laminated sheets as products

Adhesive strength: 100g/cm

Surface roughness: 2μm or less

Dimensional change: within 1%
(Sufficient gloss and adhesive strength similar to conventional

was gotten. )

Example 4 Materials used As thermoplastic resin sheet: PS foam sheet
Thickness: 1.0mm As a resin film
:PS film thickness 0.02
5mm Thermal bonding conditions Heating roll temperature: 130℃ Cooling roll temperature: 75℃ Belt speed: 5.0m/min

Characteristics of laminated sheets as products

Adhesive strength: 150g/cm

Surface roughness: 2μm or less

Dimensional change: less than 1%
(Sufficient gloss and adhesive strength similar to conventional

was gotten. )

Next, a container for instant food packaging was manufactured using a pressure forming machine using the laminated sheet according to the present invention manufactured as described above. At that time, the laminated sheet was brought into close contact with a mold so that the thermoplastic resin sheet was on the inside of the container and the resin film was on the outside of the container, heated and molded, and then cut into a predetermined size. Examples thereof are shown below.

Example 5 A container was manufactured using the laminated sheet manufactured in Example 1 above. Air pressure forming machine heater temperature: 400℃
Mold temperature: 80℃
Heating time: 4
0 seconds Container shape: Bowl-shaped container with a diameter of 100 mmφ and depth of 50 mm Characteristics of the container as a product: There are no wrinkles or peeling of the laminated sheet, and the outer surface is smooth.
Pre-printed on resin film with sufficient gloss
The drawn patterns were also clearly visible.

Example 6 (1) Manufacture of laminated sheet Materials used: Thermoplastic resin sheet: PP sheet
Thickness: 0.8mm As a resin film: Printed CPP film
Thickness: 0.025mm
(Ink containing chlorine-based PP is used as printing ink.
use. Ink adhesion thickness: 0.5 to 2 μ) Thermal bonding conditions (Place the PP sheet on the printed surface of the CPP film and apply it using the above manufacturing equipment.
Heating roll temperature: 160℃ Cooling roll temperature: 70℃ Belt speed: 3.5m/min (2)
Manufacture of Container A container was manufactured using the laminated sheet manufactured as described above. Air pressure forming machine heater temperature: 400℃
Mold temperature: 80℃
Heating time: 4
0 seconds Container shape: Bowl-shaped container with diameter 100mmφ and depth 50mm Characteristics of the container as a product: There are no wrinkles or peeling of the laminated sheet, and the outer surface is smooth.
Pre-printed on resin film with sufficient gloss
The drawn patterns were also clearly visible.

Example 7 (1) Manufacture of laminated sheet Materials used As thermoplastic resin sheet: PP foam sheet
Thickness: 1.0mm As a resin film: PP film
Thickness 0.03mm Thermal bonding conditions Heating roll temperature: 160℃ Cooling roll temperature: 70℃ Belt speed: 3.5m/min (2)
Manufacture of Container A container was manufactured using the laminated sheet manufactured as described above. Air pressure forming machine heater temperature: 400℃
Mold temperature: 80℃
Heating time: 4
0 seconds Container shape: Bowl-shaped container with a diameter of 100 mmφ and depth of 50 mm Characteristics of the container as a product: There are no wrinkles or peeling of the laminated sheet, and the outer surface is smooth.
A container with sufficient gloss was produced.

Example-8 (1) Manufacture of laminated sheet Materials used As thermoplastic resin sheet: PP foam sheet
Thickness: 0.8mm As a resin film: PP/EVOH film
Thickness 0.03mm Thermal bonding conditions Heating roll temperature: 160℃ Cooling roll temperature: 70℃ Belt speed: 3.5m/min (2)
Manufacture of Container A container was manufactured using the laminated sheet manufactured as described above. Air pressure forming machine heater temperature: 400℃
Mold temperature: 80℃
Heating time: 4
0 seconds Container shape: Bowl-shaped container with a diameter of 100 mmφ and depth of 50 mm Characteristics of the container as a product: There are no wrinkles or peeling of the laminated sheet, and the outer surface is smooth.
A container with sufficient gloss was produced.

[0023]

Effects of the Invention Since the present invention is constructed as described above, when the present invention is applied, a laminated sheet with a high glossy surface,
It is possible to provide a method and apparatus for manufacturing the same, and a container using the laminated sheet. Moreover, when according to the present invention,
Even if the base resin has low heat resistance and cannot withstand thermal adhesion, the resin sheet is held by a metal belt during the lamination process, so it can be manufactured without any problems. It is also easy to make it have high gas barrier properties.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an overview of an embodiment of an apparatus for manufacturing a laminated sheet according to the present invention.

FIG. 2 is an explanatory diagram showing an outline of another embodiment of the manufacturing apparatus.

FIG. 3 is an explanatory diagram showing an outline of yet another embodiment of the manufacturing apparatus.

[Explanation of symbols]

1 Heating roll 2 Cooling roll 3 Metal belt 4, 5 Nip roll 5a Nip roll 5b, 5c Auxiliary roll 6, 7 Frame 8 Extrusion spring 9 Slide stand 10 Thermoplastic resin sheet 11
resin film

Claims (7)

[Claims] Claim 1: A method for continuously producing a laminated sheet consisting of a thermoplastic resin sheet and a heat-bondable resin film, the method comprising: stacking the thermoplastic resin sheet and the heat-bondable resin film on top of each other; A metal belt having a sufficiently smooth surface is brought into contact with the surface of the resin film, and these are moved in the same direction at the same speed, and the metal belt is heated on the upstream side of the moving direction,
The metal belt is cooled at a predetermined distance downstream from the heated portion, and the resin film and the thermoplastic resin sheet laminated thereon are separated from the surface of the metal belt. A method of manufacturing glossy laminated sheets. 2. The method for producing a laminated sheet according to claim 1, wherein the thermoplastic resin sheet is a polypropylene sheet, and the thermobondable resin film is a polypropylene film. 3. The method for producing a laminate sheet according to claim 2, wherein a printed layer is provided on the adhesive surface of the heat-bondable resin film to the thermoplastic resin sheet using an ink containing chlorinated polypropylene. 4. The method for producing a laminated sheet according to claim 1, wherein the thermoplastic resin sheet is an olefin sheet, and the thermobondable resin film is a polypropylene film. 5. The method for producing a laminate sheet according to claim 4, wherein the thermally bondable resin film is a laminate film having gas barrier properties. 6. A printing layer according to claim 4 or 5, wherein a printed layer is provided on the adhesive surface of the thermoplastic resin film of the heat-bondable resin film with an ink containing heat-sealable chlorinated polypropylene and ethylene vinyl acetate. A method of manufacturing a laminated sheet. 7. An apparatus for carrying out the method for manufacturing a laminated sheet according to claim 1, comprising: a heating roll (1); and a cooling roll (2) provided at a predetermined distance from the heating roll. and an endless metal belt with a smooth surface stretched between the heating roll and cooling roll (
3) and nip rolls (4, 5) for press-bonding a thermally bondable resin film and a thermoplastic resin sheet in a stacked state in the section where the metal belt moves from the heating roll to the cooling roll. An apparatus for manufacturing a laminated sheet, characterized by: