JPH0346377B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention is characterized in that the metallic tone, which decreases from the center of the body of the container to the bottom, is improved by incorporating a pigment having a metallic tone and luster into at least one layer located on the inner surface of the metal vapor deposited layer. The present invention relates to a plastic flange container having a metallic luster. FIG. 1 is a cross-sectional view showing an example of a conventional multilayer sheet, in which 1 is a transparent plastic layer, which is a vacuum-deposited base film, and 2 is a vacuum-deposited aluminum layer, where 1 is the outer surface and 2 is a vacuum-deposited base film. It is attached to the plastic main layer 3 with the inner surface facing. Some have an adhesive layer between layers 2 and 3, while others do not. FIG. 2 shows an example of a container vacuum-formed using the sheet shown in FIG. 1, and the detailed structure is as follows.
The thickness t ₁ of the flange 10 is 0.83 mm (this is equal to the thickness of the sheet), the thickness t ₂ of the body center 11 is 0.50 mm, the thickness t ₃ of the bottom 21 is 0.25 mm (t ₂ , t ₃ are The opening diameter D ₁ of the container is 60 mm The bottom diameter D ₂ of the container is 54 mm The depth h of the container is 28 mm Therefore, in a conventional container, the metallic effect is as follows. Decrease. In the flange 10, the vacuum-deposited layer of aluminum has the same metallic color and luster as when it was deposited. L (lightness) 20.94, a (hue) 0.70, b (saturation) 2.60, gloss 101 The central part 11 of the body has changed to a slightly whitish color tone due to stretching, and the gloss has also decreased slightly. L (lightness) 25.01, a (hue) 0.33, b (saturation) 2.00, gloss 97 The bottom portion 12 is further stretched and changes to a considerably whitish color, becomes transparent and has a reduced gloss. The present invention improves the metallic tone that decreases from the center of the body to the bottom of the conventional container by incorporating a pigment with a metallic tone or luster into at least one layer located on the inner surface of the metal vapor deposited layer. This is as follows. The present invention provides a container formed by vacuum forming or pressure forming of a multilayer sheet having plastic layers on both sides of a metal vacuum-deposited layer, in which at least one of the plastic layers on both sides is located on the inner surface side of the vapor-deposited layer. This is a flanged plastic container with a metallic luster, which is characterized by mixing a pigment with a metallic luster into the container. In the present invention, the pigment with metallic luster can be aluminum powder, the content of which is from 0.06 to
Preferably it is 0.09% by weight. Also, the pigment can be a pearlescent pigment,
Its pearl essence content is 0.8-2.5% by weight
It is preferable that Furthermore, the pigment having metallic luster can be composed of aluminum powder and pearl pigment, and in this case, the content of the aluminum powder and pearl pigment is preferably 0.04 to 0.29% by weight and 0.1 to 3.5% by weight, respectively. The present invention will be further explained based on Examples. Example 1 FIG. 3 is a sectional view of the multilayer sheet of Example 1, in which 20 is a polypropylene film of 25 μm, 21 is a vacuum-deposited aluminum layer of 50 μm, and 22 is a 0.8 mm layer of propylene mixed with 0.08% by weight of aluminum. In this example, aluminum was vacuum-deposited on the surface of a 25μ homotype unstretched polypropylene film, and the aluminum-deposited surface of a silver-tone vapor-deposited film and a 0.8 mm extruded polypropylene sheet were pressure-bonded using residual heat from extrusion. This composite sheet was molded into a container with the same shape and size as shown in Figure 2 with the homotype unstretched polypropylene film surface facing the outside using a female mold. /

[Table] Compared to the conventional example shown in Fig. 1, the gloss level is somewhat lowered, but the metallic color effect is largely complementary, and the finished appearance is relatively closer to that of a metal container than the conventional product. Example 2 FIG. 4 is a cross-sectional view of the multilayer sheet of Example 2, where 30 is a polypropylene film of 25 μm, 31 is an aluminum vacuum-deposited layer of 50 μm, 32 is a urethane dry lamination adhesive, and 33 is an aluminum powder of 0.08 weight. %, pearl pigment 1.0% by weight mixed polypropylene layer 340μ, 34 is acid-modified polypropylene layer (adhesive) 20μ, 35 is saponified ethylene-vinyl acetate copolymer 80μ, 36 is acid-modified polypropylene layer (adhesive) 20μ, 37 is a polypropylene layer of 340μ. In this example, the aluminum surface of a homotype unstretched polypropylene film 30 having a 50 mμ thick silver-like aluminum vapor deposited layer on one side,
Polypropylene layer 33 containing 0.08% by weight of aluminum powder and 1.0% by weight of pearl pigment, and saponified ethylene-vinyl acetate copolymer (bolyer layer) 35
A pigment-containing polypropylene layer of a coextruded sheet with a total thickness of 0.8 mm and an acid-modified polypropylene layer (adhesive) 36 was adhered with a urethane-based dry lamination adhesive 32 interposed therebetween to produce a composite sheet. This composite sheet was molded into a container having the same shape and size as in FIG. 2 with the homotype unstretched polypropylene film 37 on the outside surface using a female mold, and the sheet was heated to 180°C and the vacuum degree was 50°C.
After suctioning at cm/Hg for 2 seconds, a mixture of water and air was blown for 5 seconds to cool the tube. The manufactured container had a deep metallic color tone that had both metallic color and metallic luster. The measurement results of color tone and glossiness are shown in Table 2.

[Table] This example container was filled with jelly at a temperature of 85℃, sealed with a heat-sealable lid mainly made of aluminum foil,
After being stored at room temperature for one month, an opening inspection revealed no abnormalities in the quality of the contents. Example 3 FIG. 5 is a cross-sectional view of the multilayer sheet of Example 3,
40 is a 25μ polypropylene film, 41 is a dye-colored coating (azo yellow dye in urethane paint)
10% mixed), 42 is aluminum vacuum deposited layer
50mμ, 43 is a urethane dry lamination adhesive, 44 is a 340μ polypropylene layer mixed with 1.5% by weight of pearl pigment, 45 is an acid-modified polypropylene layer (adhesive) 20μ, 46 is a nylon layer 80μ, 47
is acid-modified polypropylene layer (adhesive) 20μ, 48
is a polypropylene layer of 340μ. In this example, 10% azo yellow dye was applied to one side of Pomotype unstretched polypropylene film 25μ40.
Apply 30mg/ ^100cm2 of urethane paint containing
An aluminum vacuum-deposited layer 42 with a thickness of 50 mμ was formed on the surface of this coating film 41 to produce a gold-like vapor-deposited film. Next, a polypropylene layer 44 containing 1.5% pearl pigment and an acid-modified polypropylene layer (adhesive) 45
6 A pigmented polypropylene layer 44 of a coextruded sheet with a total thickness of 0.8 mm of a nylon layer 46, an acid-modified polypropylene layer (adhesive) 47, and a polypropylene layer 48 and an aluminum vapor-deposited layer 42 of a gold-tone vapor-deposited film 40 are made of urethane. A gold-like composite sheet was produced by adhering with dry lamination adhesive 43 of the same type. A container having the same shape and size as shown in FIG. 2 with this composite sheet homotype unstretched polypropylene film 40 on the outer surface was molded using a female mold with a mold structure, and the sheet was heated to 180° C. and the vacuum After suctioning at 50cm/Hg for 2 seconds, remove the mixture of water and air for 5 minutes.
Cooled by blowing for seconds. The produced container had a uniform gold-like appearance in each molded part. The measurement results of color tone and glossiness are shown in Table 3.

[Table] The container of this example was filled with water oat at 95℃, sealed with a heat-sealable lid mainly made of aluminum foil, and heated to 38℃.
As a result of opening and inspecting the product after storing it in a constant temperature room for one month, no abnormalities were observed in the quality of the contents. Example 4 FIG. 6 is a cross-sectional view of the multilayer sheet of Example 4, in which 50 is a polypropylene film of 25 μm, 51 is an aluminum vapor deposited layer of 50 μm, 52 is a polyester dry lamination adhesive, and 53 is an acid-modified polypropylene layer. 450μ mixed with 0.06% aluminum powder and 0.7% pearl pigment, 54 is 20μ saponified ethylene-vinyl acetate copolymer, 55 is acid-modified polypropylene layer 0.06% aluminum powder, pearl pigment
0.7% by weight mixed 450μ, 56 is polypropylene layer 80μ
It is. In this example, aluminum is vacuum-deposited on one side of a polypropylene (homotype unstretched) film 50 with a thickness of 25μ, and the surface of this aluminum-deposited layer 51 is combined with an acid-modified polypropylene layer 53 containing 0.06% by weight of aluminum powder and 0.7% by weight of pearl pigment, and ethylene. - A coextruded sheet with a total thickness of 1 mm of a saponified vinyl acetate copolymer (barrier layer) 54, an acid-modified polypropylene layer 55 containing 0.06% by weight of aluminum powder, and 0.7% by weight of pearl pigment, and a homotype polypropylene layer 56 is made of polyester A composite sheet was produced by adhering with a type dry lamination adhesive 52. Pigment is mixed in to prevent the pigment-containing layer from being exposed on the outside or inside side during adhesion.53
The surfaces of the layer and the aluminum vapor-deposited layer 51 were bonded together. As the outer surface of the homotype unstretched polypropylene film 50 of this composite sheet, a container having the same shape and size as shown in FIG. Spraying: Manufactured under conditions of 5 seconds. The manufactured container had a uniform finished appearance over all parts, including both metallic color and metallic luster. The measurement results of color tone and glossiness are shown in Table 4.

[Table] This example container was filled with jelly at a temperature of 85℃, sealed with a heat-sealable lid mainly made of aluminum foil, and opened and inspected after being stored at room temperature for one month. As a result, no abnormality was found in the quality of the contents. Nakatsuta. Additional notes Changes in the embodiments in Examples 1 to 4 above are supplemented below. () In the case of a metal vapor deposited layer that is colored (e.g. gold, blue metallic), a metal pigment corresponding to the color (e.g. gold-brass powder, copper powder).
It is even more effective to use blue metallic (blue-tinged aluminum powder), pearl pigments (e.g. gold - Marlin Pale Gold, Marlin Brilliant Gold, manufactured by Marl, USA; blue metallic - Iriodin P ₀ LA Shiraz, manufactured by Merck, Germany). . () The metal pigment may be mixed in both layers 33 and 37 in Figure 4 and layers 44 and 48 in Figure 5. Alternatively, it may be mixed into 35 or 46 layers. () The plastic film used as the base material for vacuum deposition is 10 to 50μ thick and is made of polypropylene, polyester, nylon (6, 66, 12, copolymer), or polycarbonate, all of which are unstretched. () In addition to aluminum, the metals to be vacuum-deposited include gold, silver, nickel, cobalt, tin, and platinum. () Pigments mixed into the sheet material include: Metal pigments: aluminum, gold, silver, copper, brass, nickel powder, pearl pigments: Mica-based pigments, bismuth, pearl powder, artificial pearl pigments such as fish scales, etc. () Sheet materials Polyethylene, polypropylene, vinyl chloride resin, polystyrene, polyester, polyamide resin, polycarbonate resin,
2 to 5 in the case of a composite structure consisting of ethylene-vinyl acetate copolymer, vinylidene chloride resin, acrylic-nitrile resin, and adhesives such as acid-modified polyethylene, acid-modified polypropylene, aquonomer resin, ethylene-vinyl acetate system, and ethylene-ethyl acrylate. Seeds, 2 to 7 layers.

[Brief explanation of drawings]

Figure 1 is a sectional view showing an example of a conventional multilayer sheet, Figure 2 is an explanatory diagram of a container vacuum formed using the sheet in Figure 1, and Figure 3 is a sectional view of the multilayer sheet of Example 1. 4 is a sectional view of the multilayer sheet of Example 2, FIG. 5 is a sectional view of the multilayer sheet of Example 3, and FIG. 6 is a sectional view of the multilayer sheet of Example 4. 1: Transparent plastic layer, 2: Aluminum vacuum-deposited layer, 3: Plastic main layer, 10: Flange, 11: Body center, 12: Bottom, 20: Polypropylene film, 21: Aluminum vacuum-deposited layer, 22: Aluminum 0.08% by weight mixed polypropylene layer, 30: polypropylene film, 3
1: Aluminum vacuum deposited layer, 32: Urethane dry lamination adhesive, 33: Aluminum powder
0.08% by weight, 1.0% pearl pigment mixed polypropylene layer, 34: Acid-modified polypropylene layer (adhesive),
35: saponified ethylene-vinyl acetate copolymer, 36: acid-modified polypropylene layer (adhesive),
37: Polypropylene layer, 40: Polypropylene film, 41: Dye-colored coating film (10% azo yellow dye mixed in urethane paint), 42: Aluminum vacuum deposited layer, 43: Urethane dry lamination adhesive, 44 : Pearl pigment 1.5% by weight
Mixed polypropylene layer, 45: Acid-modified polypropylene layer (adhesive), 46: 6 nylon layer, 47:
acid-modified polypropylene layer (adhesive), 48: polypropylene layer, 50: polypropylene film,
51: Aluminum vacuum deposited layer, 52: Polyester dry lamination adhesive, 53: Acid-modified polypropylene layer, aluminum powder 0.06% by weight, pearl pigment 0.7% by weight, 54: Saponified ethylene-vinyl acetate copolymer, 55: Acid-modified polypropylene layer, aluminum powder 0.06% by weight, pearl pigment 0.7% by weight, 56: polypropylene layer.

Claims (1)

[Scope of Claims] 1. In a container formed by vacuum forming or pressure forming of a multilayer sheet having plastic layers on both sides of a metal vacuum-deposited layer, the container is located on the inner surface side of the vapor-deposited layer of the plastic layers on both sides. A flanged container made of plastic with metallic luster, characterized in that a pigment with metallic luster is mixed in at least one layer. 2. The container according to claim 1, wherein the pigment with metallic luster is aluminum powder. 3. The container according to claim 2, wherein the content of aluminum powder is 0.06 to 0.09% by weight. 4. The container according to claim 1, wherein the pigment with metallic luster is a pearl pigment. 5. The container according to claim 4, wherein the content of pearl pigment is 0.8 to 2.5% by weight. 6. The container according to claim 1, wherein the pigment having metallic luster is aluminum powder and pearl pigment. 7. The container according to claim 6, wherein the contents of aluminum powder and pearl pigment are 0.04 to 0.29% by weight and 0.1 to 3.5% by weight, respectively.