JPS6132752Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to a printed laminate made by laminating a polyolefin film on a printing surface. Conventionally, printed laminates are known in which polyolefin films are laminated together for the purpose of protecting printed substrates such as paper, film, metal, or wood, and improving the aesthetic appearance of products. However, in these conventional printed laminates, when the semi-gloss property is increased, the sharpness of the print decreases, and the cutting properties cannot be said to be sufficient. The object of the present invention is to overcome the above-mentioned drawbacks of the prior art and to provide a printed laminate having moderate semi-gloss properties and excellent machining properties. This invention has the following configuration to achieve the above purpose.
That is, a printed base material 3, a layer 2 made of a polyolefin resin with a surface gloss of 80 or more on one side and a unidirectional orientation coefficient of 3 x 10 ^-3 or more, and a layer 2 made of a polyolefin resin with a surface gloss of 30 or less on one side. Layer 1 made of polyolefin resin is laminated in the order of 3/2/1, and the surface gloss of layer 2 is 80 on the printed surface of base material 3.
The printed laminate is characterized by having the above surfaces facing each other and arranging the surface of layer 1 having a surface gloss of 30 or less as the surface. The printed base material 3 in the present invention refers to paper, film, metal, wood, etc. on which characters, figures, etc. are printed or copied, and if it is printed or copied, the base material is It is not limited. Layer 2 made of polyolefin resin is a layer made of resin containing at least 50% by weight of a polypropylene component, and the resin includes polypropylene resin, polypropylene resin, polyethylene resin, polybutene-1 resin, and polybutadiene resin. mixtures, or propylene/ethylene random copolymers, ethylene/propylene block copolymers, ethylene/propylene/
These include copolymers such as butene ternary copolymers and propylene/ethylene/diene ternary copolymers, and mixtures of these copolymers with polypropylene resins. This resin also contains various additives known to be added to polyolefin resins, such as heat stabilizers, antioxidants, plasticizers, antistatic agents, organic lubricants, inorganic lubricants, pigments, and colorants. , a nucleating agent, fine particles, etc. may be added. In addition, layer 2 has a surface gloss level of at least one side.
80 or more, the orientation coefficient in the uniaxial stretching direction is 3×
10 ^-3 or more, preferably within the range of 10 x 10 ^-3 to 15 x 10 ^-3 . Note that the thickness of layer 2 is preferably 8 to 25 μm. Layer 1 made of polyolefin resin is a layer made of resin containing less than 50% by weight of a polypropylene component, such as propylene/ethylene random copolymer, ethylene/propylene block copolymer, or ethylene/propylene/butene ternary copolymer. Copolymerization, copolymers such as proprene/ethylene/diene ternary copolymers, other polyethylene resins, polybutene resins, etc.
1 resin, polybutadiene resin, or a mixture of these and polypropylene. Also,
The additives mentioned for layer 2 above may be added to the resin. Furthermore, layer 1 has a surface gloss level of at least one side.
Must be 30 or less. The thickness of the layer 1 is preferably 0.5 to 5 microns, and the resin is preferably an ethylene-propylene block copolymer. In the present invention, if the surface gloss of layers 1 and 2 is outside the above range, or if the surface of layer 1 with a surface gloss of 30 or less is laminated on the printed surface of base material 3,
The laminate loses its semi-gloss (matte) property, increases the shine caused by light rays, and impairs the clarity of printing. Moreover, if the degree of orientation of layer 2 is out of the above range,
This not only reduces the mechanical strength of the entire protective layer consisting of layers 1 and 2, but also causes poor cutting of the printed laminate by an automatic cutting machine (the cut portion has an irregular and jagged shape). In addition, when the orientation coefficient of layer 2 is 15×10 ^-3 or more,
This is difficult to obtain using normal film forming methods. In the present invention, an adhesive may be interposed between the base material 3 and layer 2, or between layer 2 and layer 1, if necessary. As described above, in the present invention, base material 3/layer 2/
Laminate in the order of layer 1, layer 1 has a surface gloss of 30 or less on the non-laminated side, layer 2 has an orientation coefficient of a specific value, base material 3
Since the printed laminate product has a surface gloss of 80 or higher on the surface of layer 2 facing the printed surface of It has excellent effects such as a good appearance and no cutting defects that occur when cutting a laminated product. The definitions of terms used in this invention are as follows. "Orientation coefficient" is the absolute value obtained by subtracting the refractive index in the longitudinal direction from the refractive index in the width direction by measuring the refractive index in the longitudinal direction and width direction of the film using an Atsube refractometer using sodium D line as a light source. value, that is, the value of birefringence in the stretching direction. "Surface glossiness" is glossiness measured according to JIS-Z8741(2). The lower the measured value, the more diffusely reflected the surface is and the less glossy it is. Next, the printed laminate of the present invention will be explained based on the drawings. FIG. 1 is a cross-sectional view of the printed laminate of the present invention.
The layers 1 and 2 made of polyolefin resin are the printed base material 3, and the layers 2 and 3 are made of polyolefin resin. Furthermore, A and B indicate surfaces with a surface gloss of 30 or less and 80 or more, respectively. The printed laminate of the present invention has a surface gloss of 80 as shown in the figure.
The above surface B is laminated on the laminated surface of the base material 3. Next, one embodiment of the present invention will be described based on Examples, but the present invention is not limited thereto. Example 1, Comparative Examples 1 to 5 A propylene homopolymer having a hot melt flow index of 3.0 g/10 min measured under condition L of ASTM-D1238 was supplied to an extruder and melted at 260°C to form a sheet forming die. After extruding, it is cooled and solidified. This sheet was stretched 5 times in the longitudinal direction to obtain a uniaxially stretched sheet. Meanwhile, an ethylene-propylene block copolymer with a melt flow index of 1.5 g/10 minutes was supplied from another extruder, melt-extruded at 280°C, laminated on one side of the uniaxially stretched sheet, and heated at 160°C in the width direction. After stretching 8 times to
The film was relaxed by 8% in the width direction and then slowly cooled to room temperature to obtain a two-layer laminated film with a thickness of 25 μm. The polypropylene content of this film was 95.0 weight percent and the transverse orientation coefficient was 12.0×10 ⁻³ . Also, the surface gloss of side A and side B is
It was 13.5, 88.1. This film is attached to a print laminator so that the B side is laminated with printing paper with a gloss level of 80.3,
When print lamination was carried out at a lamination speed of 25 m/min, the film had very good transportability and automatic cutting suitability. The resulting printed laminate product, as shown in Table 1, did not have a shiny or shiny feel, the printing appeared very clear, and it had perfect semi-gloss properties. When the glossiness of this bonded product was measured
It was 7.7. Next, using the same raw materials and the same manufacturing process as in Example 1, films with various characteristics were made by changing the raw material ratio, thickness structure, stretching ratio, etc., and print lamination was performed. The results are shown in Table 1 as Comparative Examples 1 to 5. Shown all together. Comparative Example 1 is the result of print lamination using the same film as Example 1 with the bonding surfaces reversed. Although the film of Comparative Example 1 satisfies all the characteristics and is perfect as a film for print lamination, the print laminated product obtained was no different from a normal film because the A side with low gloss was pasted together. Only the same semi-gloss was obtained. The machining characteristics were sufficiently satisfactory. Comparative Example 2 is the result of print lamination of a stretched film in which the polypropylene content, lateral orientation coefficient, and surface gloss of side A are at the same level as in Example 1, and the surface gloss of side B is 75.2.
Although the machining properties were as good as those of Example 1, the laminated product had the drawback that although the shiny feeling was completely eliminated, the printing was not clearly visible. When I measured the glossiness of this item
It was 3.5. Comparative Example 3 is the result of print lamination of a stretched film in which the polypropylene content, lateral orientation coefficient, and surface gloss of the B side are at the same level as the film of Example 1, and the gloss of the A side is 35.0. . The machining properties were as good as in Example 1. However, printed laminated products had a strong shiny appearance and the semi-gloss properties were not satisfactory.
Measuring the glossiness of printed laminated products
It was 25.6. Comparative example 4 has polypropylene content and A side,
This is the result of print lamination of a film in which the B-side glossiness was at the same level as the film of Example 1, but the stretching ratio was changed to lower the lateral orientation coefficient to 2.5×10 ^-3 . This film had semi-gloss properties as good as those of Example 1, but the automatic cutting properties during lamination were extremely poor, the cut edges were irregularly jagged, and the film was torn due to poor cutting. It has serious drawbacks such as reduced processing efficiency and reduced commercial value, and is completely unusable as a film for print lamination. Comparative Example 5 is A with a polypropylene content of 45%.
This is the result of print lamination of a film having the same level of gloss on the surface, surface B, and orientation coefficient in the lateral direction as the film of Example 1. Since this film had no stiffness and was softer than the film of Example 1, the film transportability during print lamination was not sufficiently satisfactory. The suitability for automatic cutting was as good as in Example 1. The laminated product has almost no shine, but
The clarity of the printing was lost and it was not satisfactory. Furthermore, the surface of the bonded product was the most easily damaged.

[Table] Example 2 A propylene homopolymer with a melt flow index of 3.0 g/10 min measured under ASTM-D1238 condition L was supplied to an extruder, melted at 260°C, extruded from a sheet forming die, and then cooled. solidify. This sheet was stretched 5 times in the longitudinal direction to obtain a uniaxially stretched sheet. On the other hand, from another extruder, an ethylene-propylene random copolymer with a melt flow index of 6.2 g/10 minutes was melt-extruded at 280°C, laminated on one side of the uniaxially stretched sheet, and then heated to 160°C to increase the width by 8 times. Stretch it and bring it to a heat treatment chamber at 160℃ and roll it in the width direction by 8
% relaxed. This film is passed between embossing rolls heated to 110°C to roughen the laminate layer side, then slowly cooled to room temperature to determine the thickness.
A 25 μm laminated film was obtained. The polypropylene content of this film was 99.6 percent by weight and the transverse orientation coefficient was 11.4×10 ⁻³ . The surface gloss of side A and side B was measured and found to be 14.7 and 90.8, respectively. When this film was subjected to print lamination under the same conditions as in Example 1, the machining properties and semi-gloss properties were as good as in Example 1 and were fully satisfactory.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the printed laminate of the present invention. 1: Layers 1 and 2 made of polyolefin resin:
Layers 2 and 3 made of polyolefin resin: printed base material 3.

Claims (1)

[Scope of utility model registration request] A printed base material 3, a layer 2 made of a polyolefin resin with a surface gloss of 80 or more on one side and an orientation coefficient of 3 x 10 ^-3 or more in one direction, and a polyolefin resin with a surface gloss of 30 or less on one side. The layer 1 made of resin is laminated in the order of 3/2/1, and the base material 3
A printed laminate, in which the surface of layer 2 having a surface gloss of 80 or more is placed opposite to the printed surface of , and the surface of layer 1 having a surface gloss of 30 or less is arranged as the front surface.