JPS6315742A - Transparent film for back printing with mount - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a back printing transparent film with a mount for obtaining a back printing decorative or display adhesive sheet.
By printing the transparent film for back printing with a mount of the present invention and then providing an adhesive layer on the printing surface side, a back printed adhesive sheet for decoration or display can be obtained.

[Conventional technology]

Conventionally, back-printed adhesive sheets have been known in which printing is applied to the back side of a film layer for the purpose of protecting the printed layer from light, rain, and other external impacts. Taking advantage of its characteristics, it is used in outdoor decorative films, display films, etc.

The final manufacturing method for this back printing adhesive sort is to print directly on the film, then apply adhesive to the printed surface, and then attach the back printing adhesive sheet to the mount 3 in advance as shown in Figure 2(a). After printing on the film 2, place the film 2 on the backing paper
The printed layer 4 is transferred to the film 2 by UJIFJ, and the printed film 2 is peeled off from the mount 3, and then the film 2 having the printed layer 4 is removed as shown in FIG. 2(b).
A method is known in which adhesive 5 is applied to the adhesive 5, and a release paper 6 is then applied to the adhesive sheet 1-7 to obtain the back-printed adhesive sheet 1-7.

[Problem that the invention attempts to solve]

Are you skilled in the manufacturing method of the former? Since printing is performed directly on a film without a support, in the case of films with poor solvent resistance, such as polyvinyl vinyl resin films, the film is exposed to the solvent of the printing ink, causing damage during the printing process and printing drying process. There were problems such as expansion and contraction of the film, resulting in poor appearance such as wrinkles, and lack of printing dimensional accuracy.

In addition, in the subsequent 'IJ manufacturing method, the printed layer is transferred to the film after printing on the mount and drying with the solvent, so unlike direct printing of the film, there is no attack on the film by the ink solvent and dimensional accuracy is improved. It is possible to obtain a back-printed adhesive sheet with good appearance and no wrinkles.

However, in the case of the latter manufacturing method, it requires a process of printing on a mount, a process of forming a film on the printing mount, a process of peeling the printing film from the mount, and a process of applying adhesive to the printing film. It is complicated and disadvantageous in terms of cost.

Furthermore, in the printing process when printing is performed by gravure printing, the process of forming a film, etc., there is generally a problem in productivity for small lots.

In addition, in L &Co.'s manufacturing method, the printed layer is sandwiched between the backing paper and the film layer, so when the final back-printed adhesive sheet is made, the outermost layer of the film is non-stick. The mount cannot be used without the function of protecting the printed surface from scratches, etc., and there is also the inconvenience of the process of having to peel off the mount before bonding the adhesive layer and the printing film layer together. be.

Therefore, the purpose of the present invention is to solve the above-mentioned problems that these conventional techniques had, and to solve the problem of film dimensional change in the printing process and printing drying process due to solvent attack of printing ink. , can be printed without any appearance defects, ■
To provide a transparent film for printing on the back with a mount, from which an adhesive sheet for decoration or display with printing on the back can be easily obtained.

[Failure to solve the problem]

The present invention is characterized in that it consists of a transparent or translucent film layer with a light transmittance of 40% or more, and a mount that is laminated on one side of the film layer and fixes the film layer. By providing a transparent film for use in the present invention, objective 1-1 has been achieved.

Hereinafter, the transparent film for back printing with a mount of the present invention will be described in detail.

In the present invention, the transparent or translucent film layer that serves as the printing medium has a light transmittance of 40% or more, but it protects the printing layer from light, rain, and other external IH bombardment. However, we provide back-printed adhesive sheets that are mainly intended for outdoor use, and furthermore, we provide back-printed adhesive sheets that are intended to avoid dimensional changes and appearance changes due to solvent attack when printing directly on a film. Considering this, it is better to select a film that has good outdoor weather resistance even if it has relatively poor solvent resistance.For example, vinyl chloride film, acrylic film, urethane film, etc. are commonly used. In particular, a vinyl chloride yarn film is preferred.

In addition, the above-mentioned transparent or semi-transparent film layer needs to be transparent or semi-transparent with a light transmittance of 40% or more for the purpose of seeing the printed pattern from the front side after printing on the back side. . A preferable light transmittance is 70% or more.

Furthermore, the above-mentioned transparent to semi-transparent film layer may contain various additives within a range that satisfies the above-mentioned light transmittance, such as coloring agents such as pigments, dyes, foil pieces, pearl pigments, etc. It is also possible to make a colored back printing adhesive sheet by coloring the adhesive sheet and combining it with the color of the back printing layer. Also, considering the fact that the protection of the back printing layer is ``one thing,'' adding an ultraviolet absorber to the film layer is very bad.
Ultraviolet absorber and U7 in case 2)
'Zol yarn Shiyu 1-ray absorber, -, Nzoso-cho~Non-yarn ultraviolet ray 1) 5, acid agent, Noanoak IJ L--1-yarn ultraviolet absorber 1) / punishment'-9.

As for the thickness of the film ＠ mentioned in 1.
Thickness I) is better if it is thicker, but 1) Cat IV from the strike aspect
Force 9゛1 (better, total 5-500μ, good E [L
, <&;l: 20-300μ, more preferably 25-20 (1,17 months).

In addition, as the mount for fixing the above film layer and the fiv layer, it is preferable to use a material that can be used in as many ways as possible, such as printing. ] - Not only can it be used to fix the film in the process, it can also be used as a blank paper for film formation, and it can also be used to protect the non-printing surface of the film, which becomes the top layer in the final back printing adhesive sorting. It is preferable to use 1
In terms of physical properties, 13Ei'' (Bollier 1/U-Resotare-1) film, 4N41 laminate, and PET film having a thickness of 10 to 75 μm are preferable.

The film-contacting surface of the mount described in I is pre-coated to a desired surface state, such as mirror finish, matte finish, semi-matte finish, or LJ depending on the case.
By adjusting the surface conditions such as various widths and shapes, there is a lino sheet that can more easily provide a back-printed adhesive sheet with a desired surface condition (1).

The transparent film for back printing with a mount of the present invention is produced by directly applying a fluid resin liquid such as a solution or sol to the above-mentioned mount NIL, which is to serve as a mount for fixing the film, and drying and melting it into a gel. A film layer is formed by means such as ・U, simple t4
'+ can be obtained. This solution-like or sol-like flow 1jth b (bile fluid includes vinyl chloride-based 'rllF(te]-rahydrofuran) solution, vinyl chloride-based plastisol, hinyl chloride-based organodull, acrylic-based "T' I (
Examples include F solution, urethane-based 1) MF (dibutylformamide) solution, and the like.

The adhesive strength between the mount and the film layer in C of the present invention varies depending on various uses and requests, as well as the selection of the mount and the amount of l added to the film layer. Types of yen agents and release modifiers,
Various measures can be taken, such as adjusting M, etc., but in order to prevent unintentional peeling during transportation, processing, etc., and to sufficiently suppress dimensional changes in the printed T culm. , 1 g/cm or more, preferably 3 g/(・1) or more, and furthermore, the mount should not be easily peeled off from the film layer at a desired stage after printing is completed.
Considering that the adhesive strength is 100 g/cm, preferably 5 (17 cm) or less. The mount of the present invention (=J*b') is produced by manufacturing a transparent film for printing.

In order to produce an adhesive sort printed on the back using the transparent film for printing on the back of the mount A/1 of the present invention, printing is applied to the film layer of the transparent film for printing on the back of the mount, and an adhesive is applied to this printed layer.・10 You can also add release paper. in this case,
The means for printing on the fill 7, 1 mark is not particularly limited, but generally screen printing, offset printing, gravure printing, letterpress printing, etc. are used.

In addition, the adhesive and release paper used in this method are similar to those used in conventional back-printed adhesive sorting, such as acrylic, rubber-based pressure-sensitive adhesives, heat-sensitive adhesives, Ponotomel I adhesive or the like, silicone-filled release paper, etc. are generally used. Also, the stiffeners can be laminated in the same manner as in the conventional method. Further, the mount may be peeled off at any desired stage after the printing process is completed, and it is preferable to leave the mount as far as possible until the final culm, so that the final printed back can be removed. The printed surface of the film, which is the outermost layer of the adhesive sheet, is completely protected from scratches, etc.
It can be a very good product.

An example of the transparent film for printing on the back with a mount of the present invention and the back-printed adhesive sheet 1- obtained from the film will be explained with reference to the drawings. In FIG. It is composed of a transparent or translucent film layer 2 having a light transmittance of 50% or more, and a mount 3 which is fFtl- on one side of the film layer 2 and fixes the film N2. Reference numeral 7 denotes an adhesive sheet with back printing, which is constructed by sequentially laminating a printing layer 4, an adhesive layer 5, and a release IE 6 on the film layer 2.

〔Example〕

Next, the transparent film for back printing with a mount according to the present invention will be described in more detail with reference to Examples and Comparative Examples.

Example 1 A 50μ thick transparent vinyl chloride film with PET was produced by coating a vinyl chloride organosol on a 75μP P,T film (east side type, trade name Lumirror), drying it, and melting it into a gel. (Light transmittance 91%
) to 1) again.

The performance of this transparent film with PET was tested based on the test method described later. The results are shown in Table 1, and there was no dimensional change in the printing, and the print finish was good, achieving the object of the present invention.

Comparative Example 1 A transparent film with PET was manufactured in the same manner as in Example 1, and then the PET film was peeled off to obtain a transparent film.

The printability of this transparent film alone was examined in comparison with Example 1, which is a product of the present invention. The results are shown in Table 1. Direct printing on a single transparent film resulted in high printing accuracy and poor appearance.

Comparative Example 2 7577PF, T film was printed in advance, and a film was formed thereon in the same manner as in Example 1,
Thereafter, the PET film was peeled off to obtain a printed transparent film.

As shown in Table 1, this film had good printing accuracy and a good print finish.

Example 2 P was produced in the same manner as in Example 1, except that 0.5 parts by weight of cyan blue was added and dispersed as a coloring agent to 100 parts by weight of vinyl chloride in the vinyl chloride organosol of Example 1.
A colored translucent film with ET (light transmittance 72%) was obtained.

As shown in Table 1, this colored translucent film with PET has no dimensional change due to printing and has a good printing finish.
The object of the present invention could be fully achieved.

Comparative Example 3 A colored translucent film with PET (light transmittance 37%) was obtained in the same manner as in Example 2 except that the amount of cyan blue added in Example 2 was changed to 1.5 parts by weight.

As shown in Table 1, this colored translucent film with PET showed no dimensional change during printing and had a good print finish, but the appearance of the print was not good.

Comparative Example 4.5 A PET film was prepared in the same manner as in Example 1 except that the amount of lubricant and release modifier in the vinyl chloride organosol of Example 1 was increased (Comparative Example 4) and decreased (Comparative Example 5). Transparent films with PET having different adhesion strengths were obtained.

As shown in Table 1, the transparent film with PET of Comparative Example 4 had an inconvenient adhesive strength that was too low and easily peeled off.

Moreover, the transparent film with PET of Comparative Example 5 had an inconvenient adhesive strength that was too high to be easily peeled off.

<Test method> ・ ■Total light transmittance The total light transmittance of the formed film layer to JIS-67
The measurement was carried out in accordance with the measurement of parallel light transmittance in No. 14.

Measuring instrument manufactured by Toyo Seiki Direct-reading haze meter Note) If the surface of the film layer has a large effect on the transmittance, such as when using a mount such as a cape-like mount, a mirror film for transmittance measurement can be made to measure the entire transmittance. Light transmittance was measured.

■Printing test■-1; Dimensional change rate 20cm square cedar can be printed using a screen plate,
Screen printed on film.

After the ink had dried, the dimensions of the printed surface on the film were measured, and the =J method conversion rate from the plate was calculated.

■-2: Appearance review (illi eight The printing rank was visually measured based on the 1ζ rank.

1...A 20cm square is printed without any distortion, and there are no wrinkles or sagging on the film.

2...No wrinkles, sagging, etc. occur in the filler, but due to local dimensional changes, the 20 cInIn square is printed in a dry and distorted shape.

3...Wrinkles, sagging, etc. occur in the film.

■-2: Appearance tN' hlli 13 Fill the printing layer 1. ．． The appearance rank when looking at the layer with jIrI was measured based on the following rank.

1...The printed layer is clearly visible.

2...The printed layer appears to have lost some clarity.

3...The printed layer appears to have lost its sharpness.

4...Printed layer is hardly visible.

■Adhesive strength between mount and film Fix the film side of the film with mount and rotate the mount 180°
The peel resistance during peeling was measured using a tensile tester at a tensile speed of 300 mm/min in the direction.

(2) Peelability Evaluation The peelability between the mount and the film was evaluated based on the following ranking.

1...In the printing test, there was no film lifting from the mount, and even in the simple folding test, there was no film lifting.

2... In printing test 1~, the film did not lift from the mount, but the film easily lifted from the mount during the bending test.

3...During the printing test, the film lifted from the mount.

4... The adhesive strength between the mount and the film is extremely large, making it extremely difficult to peel off the mount, and if it is forcibly removed, the film surface will be damaged.

Table 1 [Effects of the Invention] The transparent film for back printing with a mount of the present invention fixes the transparent or semi-transparent film layer with a mount, thereby making it easier to print on films with poor solvent resistance, which was previously difficult. If the transparent film for back printing with a mount of the present invention is made easy, it becomes possible to provide back printing adhesive sheets for various films at low cost and easily.

Furthermore, since the printing layer is protected by the film layer, the adhesive sheet made from the back printing transparent film with mount of the present invention can be applied outdoors and other places under various harsh conditions. have characteristics.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a back printing adhesive sheet formed using the transparent film for back printing with a mount of the present invention. Figure 2 (al and [bl are cross-sectional views showing the process order of a conventional example of obtaining a back printing adhesive sheet by mount printing and film transfer methods, respectively. ■... Transparent film for back printing with mount 2... Film M3... Mount

Claims (6)

[Claims] (1) A transparent film for back printing with a mount, comprising a transparent or translucent film layer with a light transmittance of 40% or more, and a mount that is laminated on one side of the film layer and fixes the film layer. . (2) The transparent film for back printing with a mount according to claim (1), wherein the transparent or translucent film layer has ultraviolet absorbing ability. (3) A transparent film for back printing with a mount according to claim 1 or 2, wherein the mount is a PET film. (4) The transparent film for back printing with a mount according to claim 1 or 2, wherein the mount is a process paper. (5) Mounting paper and transparent to translucent film layer weigh 1 to 100 g
The transparent film for back printing with a mount according to any one of claims (1) to (4), which is fixed with an adhesive force of /cm. (6) The thickness of the transparent or translucent film layer is 5 to 500μ
The transparent film for back printing with a mount according to any one of claims (1) to (5).