JPH03164226A - Preparation of transfer printing plastic sheet - Google Patents

Abstract

PURPOSE:To continuously prepare a plastic sheet having a solidified and fixed transfer layer by feeding the raw material of a transfer foil having a transfer layer on the base film thereof to a cooling roll along with a sheet like article extruded in a molten state to laminate the sheet like article to the transfer foil and releasing the base film of the transfer foil. CONSTITUTION:A thermoplastic rosin is extruded in a sheetlike form from a T-die 1 in a molten state and cooled and solidified by a cooling roll 2 to prepare a plastic sheet. At this time, the raw material 4 of a transfer foil having a transfer layer 7 is fed to the cooling roll 2 to be passed between the cooling roll and a pressure roll 2' while pinch pressure is applied to the transfer foil. The transfer foil and the molten resin sheetlike article are laminated between the cooling roll and the pressure roll in a contact state. The laminated sheet 8 passes on the surfaces of polishing rolls 3, 3' and a base film 6 is released to be taken up by a roll 5. By this method, a plastic sheet 9 having the transfer layer solidified and fixed thereto is obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing a transfer printed plastic sheet, and more particularly, the present invention relates to a method for manufacturing a transfer printed plastic sheet, and more specifically, by organically combining transfer printing technology and extrusion lamination technology. , relates to a method for continuously manufacturing transfer printed plastic sheets.

[Prior Art] Plastic sheets are often used for printing because they are flat and can be rolled up, but unlike paper they are not absorbent and have elasticity. It is not always easy, as there are problems such as the adaptability and dimensional stability of printing inks, and the durability of the heating and drying process.

Currently, printing (painting) on plastic sheets involves (1) molding the plastic sheet and then cutting it into veneers;
Common methods include screen printing, foil stamping (hot stamping, etc.), and (2) printing on a plastic sheet/roll by secondary processing using an offset method.

However, method (1) has poor productivity, and especially in screen printing, it is difficult to print complex patterns or glossy, smooth and beautiful prints. Furthermore, with the method (2), current gravure printing, flexographic printing, etc. cannot produce beautiful, metallic-glossy printing, and the abrasion resistance of the printed surface is insufficient.

[Problems to be Solved by the Invention] An object of the present invention is to perform printing on a plastic sheet beautifully and, if necessary, with metallic luster with good productivity.

Another object of the present invention is to provide a plastic printed sheet in which printing is completed at the same time as the plastic sheet is molded, and which can be punched immediately after molding.

The present inventors first discovered that using transfer printing using a transfer foil (transfer paper) having a transfer layer (ink layer) on a base film (carrier film), printing was performed in advance on a film or paper with good printability. Then, in order to transfer this to molded products, etc., we focused on the fact that the printed layer is beautiful and can also be given a metallic luster using multicolor printing or aluminum vaporized foil, etc., and developed this transfer printing technology. We investigated the application of this method to printing plastic sheets with good formability.

As a result, when manufacturing a plastic sheet by extruding the molten resin into a sheet through a slit die (T-die) and solidifying it with a cooling roll, the original transfer foil is fed into the cooling roll, and the cooling roll and pressure roll If the base film of the transfer foil is then peeled off, a plastic sheet having a solidified and fixed transfer layer can be continuously produced, and the above purpose can be achieved. I found out what I can do.

The present invention has been completed based on these findings.

[Means for Solving the Problems] Thus, according to the present invention, in a method for manufacturing a plastic sheet by melt-extruding a thermoplastic resin into a sheet from a snot die and solidifying it with a cooling roll, together with the melt-extruded sheet-like material, , the original fabric of the transfer foil having the transfer layer on the base film is sent to a cooling roll, the sheet material and the transfer foil are laminated, and then the base film of the transfer foil is peeled off to form a solidified and fixed transfer layer. A method for producing a transfer-printed plastic sheet is provided, characterized in that a plastic sheet having the following properties is obtained.

The present invention will be explained in detail below.

(Plastic sheet) In the present invention, the thermoplastic resin used as the material for the plastic sheet includes, for example, ponoethylene-based,
Well-known plastic sheets such as polypropylene-based, polyvinyl chloride-based, polystyrene-based, polyacrylonitrile, polycarbonate-based, polyester-based, and polyamide-based plastic sheets can be mentioned.

These plastic sheets may be extruded into foam.

(Transfer foil) Transfer foil is a printed mount (paper or film) for transfer, and is also called transfer paper. Transfer foil usually has a release layer, pattern printing layer (ink printing layer), vapor deposition layer, etc. on a base film (carrier film).
It has a multilayer structure including an adhesive layer, a protective layer, etc.

These layers are collectively referred to as a transfer layer (ink layer). The laminated structure of the transfer layer can be determined as appropriate depending on the purpose of use, the type of plastic sheet material, etc.

As the pace film, for example, films or sheets made of polyethylene terephthalate, polypropylene, polyamide, polyacetal, cellophane, paper, etc. can be used. Among these, from the viewpoint of processability and heat resistance, polyethylene terephthalate is preferred. Film is preferred.

A release layer is usually provided on the base film in order to improve separation of the pattern printing layer and the like and to serve as a protective layer after transfer. As the mold release agent for forming the mold release layer, for example, known ones such as various surfactants, waxes, acrylic resins, vinyl chloride-vinyl acetate copolymers, silicones, thermosetting melamine resins, etc. can be used. , among them,
Preferred is a vinyl chloride-vinyl acetate copolymer which is excellent in abrasion resistance, optical finishability, etc.

As the coloring agent for forming the pattern printing layer, commercially available inks and the like can be used, but cellulose-based coloring agents are preferable in order to prevent the printing layer from flowing due to heat during the production of plastic sheets.

Furthermore, in order to prevent deterioration and damage caused by heat during plastic sheet molding, a thermosetting brimer such as polyalkyd, polyurethane, melamine, etc. may be applied.

Further, a vapor deposition process can be performed as necessary, and a vapor deposition removal process can also be performed as necessary.

An adhesive may be applied to the surface layer of the transfer foil to ensure adhesion to the plastic sheet.

In the present invention, in order to enable continuous transfer, it is generally preferable to use the transfer foil as a raw material wound onto a roll.

One embodiment of the transfer foil used in the present invention is shown in FIG.

The transfer foil shown in FIG. 2 consists of a base film 11, a release layer l2, a pattern printing layer 7, a printing protection layer (thermosetting brusher) 13, and an adhesive layer 14. The adhesive M14 is not necessarily required.

(Manufacturing method of transfer printing plastic sheet) Figure 1 shows
1 is a schematic diagram illustrating a method of manufacturing a transfer printed plastic sheet of the present invention.

A thermoplastic resin is melt-extruded into a sheet form from a T-die 1 and cooled and solidified by a cooling roll 2 to produce a plastic sheet. is sent to the cooling roll and passed between the cooling roll and the pressure roll 2' while applying pinch pressure.

The transfer foil and the molten resin sheet are laminated between a cooling roll and a pressure roll while being in contact with each other. The laminated sheet 8 is passed through the surfaces of the polishing rolls 3 and 3', and then the base film 6 is peeled off and wound onto the roll 5. The number of polishing rolls can be determined as appropriate.

In this way, the plastic sheet 9 with the transfer layer solidified and fixed
is obtained.

Conditions such as the melting temperature of the resin and the temperature of the cooling roll can be the same as those used for manufacturing ordinary non-oriented plastic sheets using a slit die (T-die).

The transfer printing layer of the obtained transfer printing plastic sheet is
It has the strong gloss and beauty that are characteristic of transfer printing.

The method described above can also be applied to continuous printing on extrusions into foam.

f Example] Hereinafter, the present invention will be specifically explained with reference to Examples.

[Example] Pellets of volibropylene (manufactured by Mitsubishi Yuka Corporation, trade name: volibropylene FL25R) were prepared with a diameter of 90 mm, L/D=
Lip clearance attached to 28 extruder 0.8m
The sample was extruded into a sheet from a T-die having a lip with a width of 1,300 mm. Melt resin salinity is 220℃, extrusion amount is 1
It was 50 kg/hour.

The extruded sheet was kept at a temperature controlled at 15°C.
It is rapidly cooled on a cooling roll with a diameter of 0.00 mm, and at that time, as shown in Figure 1, the original transfer foil is fed between the cooling roll and the pressure roll, and a pinch pressure (gauge pressure of 3k
g/cd).

The transfer foil has a polyethylene terephthalate film, a release layer, a pattern printing layer (cellulose-based), and a printing protection layer (halogenated polypropylene), and has approximately the same width as the plastic sheet.

The resulting transfer-printed polypropylene sheet has a laminated structure shown in FIG.
(500um). It had a protective layer 13, a pattern printing layer 7, and a release layer 12, and had beautiful printing with strong abrasion resistance.

(The following is a blank space) [Advantageous effect of the invention 1] According to the present invention, it is possible to use a transfer foil and simultaneously process it at the time of sheet molding to obtain a beautiful transfer printed plastic sheet with a metallic luster if necessary. Management can be performed easily and accurately, improving productivity.

In addition, a plastic printed sheet that can be punched and formed immediately after molding can be obtained, and the number of days required for post-processing can be significantly shortened. It can also be applied to extruded foam products.
It can also be applied to automobile ceiling materials, wall materials, etc. that use foam.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram illustrating the method of manufacturing a transfer printed plastic sheet of the present invention. FIG. 2 is an embodiment showing the laminated structure of the transfer foil used in the method of the present invention,
FIG. 3 shows one embodiment of the laminated structure of the transfer printed plastic sheet. 1: T-die, 2: Cooling roll, 4: Transfer foil original, 5:
Base film take-up roll, 6: transfer foil paste film, 7: pattern printing layer, l1: base film, l2: release layer, ■3 protection

Claims (1)

[Claims] (1) In a method of manufacturing a plastic sheet by melt-extruding a thermoplastic resin into a sheet through a slit die and solidifying it with a cooling roll, together with the melt-extruded sheet, a transfer foil having a transfer layer on a base film is produced. Transfer printing characterized by feeding the paper into a cooling roll, laminating a sheet material and a transfer foil, and then peeling off the base film of the transfer foil to obtain a plastic sheet having a solidified and fixed transfer layer. method for producing plastic sheets.