JPS5953189B2 - How to choose printing ink for packaging bags - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for selecting printing ink for use in packaging bags for road marking materials in which the packaging bags are used as part of the raw materials for heat-melting road marking materials.

There are about 30 to 40 types of printing inks for packaging bags currently on the market, and the main ones are red, navy blue, blue, black, yellow, and grass-colored organic pigments and inorganic pigments.

Generally, the purpose of printing on packaging bags is to display the product's trademark, manufacturer, quality details, instruction manuals, precautions, etc. When selecting a printing ink, the pigments used in the printing ink and the The reality is that no consideration is given to the performance or type of varnish.

By the way, the present applicant has previously proposed a road marking material using packaging bags, in which packaging bags are used as part of the raw material for road marking materials, with the aim of effectively utilizing resources and improving quality.
Japanese Patent Publication No. 52-30830).

However, since the ink used to print on packaging bags is heated and melted as part of the raw material, the type and performance of the printing ink is limited for the following two reasons. . The first problem is the heat resistance of the color pigments used in printing inks.Generally available pigments are not specially processed to improve their heat resistance, so red pigments are brownish-brown. Second, yellow-based pigments change to dark green, and blue-based pigments change to dark blue, and the pigments must be able to prevent such discoloration. The second is that road marking materials are mainly classified into two types of paint materials, white or yellow, depending on the purpose of use, but depending on the hue of the ink printed on the packaging bag, it is possible to The hue becomes muddy and visibility is significantly impaired. This invention was made focusing on the above-mentioned points, and provides a packaging bag that has good heat resistance to heat melting and mixing, and that can improve visibility when mixed with paint materials originally used for road marking materials. The purpose of this paper is to provide a method for selecting printing inks.

That is, the present invention provides a method for selecting printing ink for use in packaging bags for road marking materials, in which the packaging bags are used as part of raw materials for heat-melting road marking materials, and the method includes Accordingly, either a cold color printing ink or a warm color printing ink is selectively used.

The cold-color printing inks mentioned here are represented by Munsell's color display method, which is generally adopted to represent the color of objects, starting with 5GY (green yellow), 5G (green), and so on. 5BG (green blue)
, 5B (blue), 5PB (purple blue), and 5P (purple), including printing ink.

In addition, warm color printing inks include Munsell color system starting from 10P (purple), 5RP (red purple), 5R (red), 5YR (yellow red),
Refers to printing ink having hues up to 10Y (yellow 1) including 5Y (yellow 1).

・? (1) When the road marking material is white, a printing ink with a cool hue is used, but the range of hues of the printing ink used in the present invention is expressed by the color display method using the Munsell color system described above. , preferred starting from 2.5G6.5/9 (bright green) and 2.5BG4.5/8 (turquoise)
, 2.5PB4/10 (blue) 10PB3/11 (blue-purple)
It is a printing ink having a range of hues up to 5P3114 (Saeta Purple) including .

(If the material is yellow, a printing isokey with a warm hue is used, but the hue range of the printing ink used in the present invention is preferably 5R4/5R4/ Starting from 14 (saeta red), 5YR6/
It is a printing ink having a range of hues including 12 (yellow red) and up to 5Y8.5/14 (plain yellow).

This invention will be explained in more detail below.

The present invention is a method for selecting printing ink for use in packaging bags for road marking materials in which packaging bags are used as part of raw materials for heat-melting road marking materials, and when using this road marking material, In order to heat, melt, and mix at 180 to 200°C, the printing ink used to print on packaging bags must be heat resistant.

Components of the printing ink include pigment varnish, auxiliary agents, etc., all of which have the above-mentioned heat resistance. In this invention, the pigments used in the heat-resistant cold-color printing ink and warm-color printing ink include the following.

B Red pigment: Lake Red C (C.I.l5585
, β-naphthol), and D (C.I.l55OO
, β-naphthol), Permanetlet GC (C.
I. l2O75, β-naphthol series), Lake Red 4
R (C.I.l2l2O, β-naphthol type), Permanet F4R (C.I.l2335, β-naphthol type), FRL (C.I.l244O, β-naphthol type), Bengara, etc. are good. Generally, when made into a lake (metal salt),
Weather resistance, heat resistance, etc. are improved, and further improvements can be made by using a coating agent such as wax, resin, and inorganic pigment in combination.

Yellow pigments: yellow lead (C.I.776OO), yellow iron oxide (C.I.77492), cadmium yellow (C.I.
．． I. Inorganic pigments such as 77l99) are preferred, and yellow lead is preferably treated with a coating agent such as an inorganic extender pigment.

C. Blue pigments: Ultramarine (C.I.77OO7), Prussian blue (
C. I. 775lO & 77520), Phthalocyanine Blue B (C.I.74l6O, phthalocyanine type), Indanslable-RS (C.I.698OO, anthraquinone type), Heliogen Blue G (C.I.74lO
O, phthalocyanine), Spinning Blue BV (C.
I. 698OO) and the like, and inorganic pigments such as ultramarine and navy blue are preferable from the viewpoint of heat resistance and weather resistance.

2. Green pigment: Diamond Green Lake (C.I.
．． 42O49 & 49010 Lake), Pigment Green B (C.I.lOOO6), Green Cold (C.I.
tl2775), Heliogen Green G (C. [742
60, phthalocyanine type) etc. are good.

E-free pigment: Carbon black (C.I) 772
65), aniline black (C.I.5O44O), etc. are good.

Cool color printing ink using the above pigments A to E:
Toning to various hues of V-fu color printing ink.

At this time, if the pigment used in the printing ink is subjected to post-treatment such as coating for the purpose of imparting heat resistance, the weather resistance will also be significantly improved. Next, the heat-resistant varnish, auxiliary agents, and additives used as constituent elements of the printing ink will be explained. The printing varnish used in this invention is compatible with the varnish of the paint material, which is a component of the road marking material itself, because packaging bags with printing ink are used as part of the raw materials for the road marking material. 2) When printing on packaging bags, the ink should have good solubility and have a synergistic effect, such as improving adhesion and durability, etc. Two points must be satisfied: no problems will occur.

From the above point of view, more than 35 to 40 types of synthetic resins are generally used as printing ink varnishes, including polyvinyl acetate, polyvinyl chloride, polyamide resins, modified alkyd resins, petroleum resins, melamine resins, and water-based emulsions. In this invention, it is preferred to use polyamide resins, phenolic resins and petroleum resins.

In addition, auxiliary agents and additives for printing inks include general plasticizers for varnishes, vegetable oils such as castor oil and bean oil, animal oils such as whale oil and fish oil, mineral oils such as liquid paraffin, D
B.P. Styl phthalates such as DOP are used, and common solvents such as alcohols and esters are used as varnish diluents.

In this way, when the petroleum resin is used as the printing varnish, there are some problems with balance in terms of printing suitability, ie, winding properties, adhesion, quick drying properties, etc., but semi-drying oils, solvents, etc. Can be resolved by adding.

In addition, in the case of polyamide resin, the desired high temperature range (180~
The varnish can be made to sufficiently withstand temperatures (200°C), and even in the case of phenolic resin, the heat resistance can be improved by adding heat-resistant lake pigments, semi-drying oils, solvents, etc. As described above, by using a printing ink varnish that has good compatibility with the varnish used in the coating material itself and has good heat resistance, the visual recognition effect of the coating film of the road marking material can be enhanced.

The amount of printing ink applied when printing on packaging bags depends on the size and area of the packaging bag and its effectiveness as a trademark or design.
This is determined by taking into consideration the following factors: if the actual area of the printed display is too large compared to the area of the bag, the display effect will be diluted.

For example, the area of the packaging bag is 5712cIn2 (68cm x 4
2cm x 2), the actual area of the printed display is 5
It is effective to set the area to 70 to 710 cm2 (area ratio 1/10 to 1/8), and the appropriate amount of printing ink to be applied is 1 to 2 g.

If it is less than 1 g, the trademark display effect will be weak, and if it is more than 2 g, the design will be excessive, and the display effect will become complicated and will be halved.

In addition, if the hue of the road marking material is white, it is preferable to use blue or purple printing ink, and the coating amount is close to 2 g, and if the road marking material is yellow, it is preferable to use red or orange printing ink. Preferably, the coating amount is close to 1.5 g. Next, the hue of the printing ink to be printed on the packaging bag is selected depending on the paint material of the road marking material itself.

That is, when the coating material is a white material, white visibility is improved by using a printing ink using a cold color pigment such as blue, purple, or green.

This is because the effect of blue ink is produced. In addition, if the paint material is a yellow material, for example, special heat-resistant yellow lead,
Blue discoloration has the property of turning yellow-brown when the temperature exceeds the set temperature (250℃ or higher), and after melt-painting road marking materials, there is a decrease in nighttime reflectivity (no reflection in yellow light, etc.) and a decrease in daytime visibility. Since this may cause problems such as fading (greenish-yellow instead of yellow paint), printing ink using warm color pigments such as red and orange is used.

Examples are given below.

Example 1 a. Polyethylene packaging bag containing 15% ethylene vinyl acetate copolymer (68 cm x 42 cm x 2, area 57120
1ri
0.6 part B. Thermoplastic resin(
Rosin modified maleic acid resin)
Part 18C. Plasticizer (modified alkyd resin)
Part 2 D. Colored pigment (TiO2: zinc white = 1:1)
Part 15 E. Inorganic filler (calcium carbonate, silica sand)
48.4 Part F. Reflective material (glass beads 105-840μ
) After mixing 16 parts of the above d-f with a mixer, C was added to this mixture and further mixed to form a uniform composition.

This composition was packed in a packaging bag (a), and the thermoplastic resin (b) was placed thereon to prepare a white heat-melting road marking material. On this packaging bag a, a trademark, instructions for use, etc. are printed in advance using printing ink having various hues so that the actual area is 330 to 440 cIn2, and road marking materials are heated and melted by a known method. A test board of 70 x 1,501 nm is coated with a film thickness of 1.5 to 1.7 mm at a temperature of ~200°C, and the hue is used as a color notation method for heat-melting road marking materials, which is common in the industry. NBS used for
Measurement was performed using the unit (L, a, b) color difference display method, and the results shown in Table 1 were obtained.

From the results in Table 1, it can be seen that white visibility is improved in the latter two colors, blue color and purple color.

This is a problem with the balance between a value and b value according to the color difference display method, and generally L is 88 or more and a value is 0.1.
〜1.0, b value is preferably in the range of 2.0 to 3.5. In the attached NBS unit hue display system model diagram, the diagonal double line area A indicates the range with good visibility for white materials, which is It can be seen that the product "reduces the yellowness and blackness contained in the white color."Example 2 a. A polyethylene packaging bag (68cm x 42cm x 2, Area 5712
cIn! ) 0.7
Part B. Thermoplastic resin (rosin modified maleic acid resin)
Part 18C. Plasticizer (modified alkyd resin) 2 parts. D. Coloring pigment (heat-resistant yellow lead) 6 partsE. Inorganic filler (calcium carbonate, silica sand) 57.3 parts F. Reflector (glass beads 105 to 840μ) 16 parts A yellow heat-melting type road marking material consisting of a to f was produced using the same method as in Example 1, and the packaging bag a was preprinted with various hues. Apply 1.3 to 1.8 g of 3 ink and apply the colored paper to the above N.
It was measured by the trap unit color difference display method...The results shown in Table 2 were obtained.

The b value of road marking materials using warm color pigments is 40 to 42, compared to 40 for the color designated by the National Police Agency, while the b value of road marking materials using cool color pigments such as blue, purple, and green is 29 to 42. It can be seen that it is as low as 34, causes a large change in hue, and has the opposite effect. However, in the above-mentioned hue display system model diagram, region B indicates a range in which the hue of the yellow material does not change significantly, and the tolerance range is much wider than that for the white material. In addition,
In the case of yellow materials, when the road marking material itself is packaged in a packaging bag, it looks like it is colored yellow as a whole, so in order to emphasize the display effect of trademarks, etc., it is recommended to use red or orange. Preference is given to using pigments.

Example 3 In the same manner as in Example 1, a white heat-melting road marking material consisting of a to f was prepared, and a heat-resistant cold color pigment (crystal violet) was used in the packaging bag a. Then, mix it with various varnishes to make printing ink, print the trademark, instruction manual, etc. on this product so that the actual area is 330 to 440 an1, and use a known method to print it.
A test plate was prepared by heating, melting, and mixing road marking materials in the same manner as in Example 1, and the hue was measured in NBS units (L, a
, b) Measured by color difference display method and obtained the results shown in Table 3.

Claims (1)

[Claims] 1. When printing on packaging bags for road marking materials using packaging bags in which packaging bags are used as part of the raw material for heat-melting road marking materials, heat-resistant pigments are used and heat-melting of the road marking materials is performed. Selection of printing ink for packaging bags, characterized in that if the hue after painting is white, a heat-resistant cold color ink is used, and if the color is yellow, a heat-resistant warm color printing ink is used. Method.