JP3142948U - Tableware with pattern made of transparent resin - Google Patents

Abstract

An object of the present invention is to form a three-dimensional picture film with a single-layer film and integrate the picture film with a container body made of the same resin that has been injection-molded. A container with a pattern for drinking or food is provided.
A drinking or food container main body made of an injection-molded transparent resin and a picture film inside the main body made of a transparent film made of the same resin as the main body. The film with a picture is a single-layer material film with a pattern printed on one side, formed into a three-dimensional shape by vacuum forming and punching into a flange covering the opening edge of the main body and a band-shaped ring covering the inner peripheral surface of the main body. Consists of things. The belt-like ring body is thin and has the pattern on the outer surface as it goes from the border of the flange to the lower end. The pattern is provided by covering the inner surface of the main body with a band-shaped ring by integral molding of the picture film and the main body by insert molding.
[Selection] Figure 1

Description

  The present invention relates to a tableware with a pattern formed of a transparent resin such as a drinking container such as a cup or a food container used on a table.

  As a means of applying a pattern to the inner surface of a hot water bath made of a thermosetting resin, a printed paper with a pattern impregnated with resin and dried is formed into a ring-shaped strip to form a foil with a pattern. The foil with a picture is stuck on the inner surface of the main body during compression molding of the main body.

Also, as a picture insert molded product, a material film with a picture layer printed on one side of a laminated film is formed into a three-dimensional shape on the picture insert inner film with a shape that matches the surface of the molded article by vacuum forming, and the picture insert film Is inserted into a cavity of an injection mold to form a pattern layer as a mold surface, and molten resin is injected and filled onto the pattern layer to integrate the molded product and the insert film with a picture.
JP 2007-160924 A JP 2000-84972 A Japanese Patent Laid-Open No. 10-15986

  In painting with a foil with a picture on which a printed paper with a pattern is formed in an annular belt, the foil with a picture is opaque, so it is used for transparent and patterned tableware such as drinking containers such as cups and food containers used on the table I can't. Also, the resin pressure acting on the inserted picture foil is higher in the injection molding than in the compression molding, and in the annular band made of printing paper, the resin pressure at the time of the injection molding of the tableware body causes deviation and wrinkles, and the inner surface of the main body It is difficult to evenly attach the foil with a picture.

  In addition, it is attempted to insert a foil with a printed paper into an annular band instead of a film with a pattern printed on a transparent laminated film, and insert it into a core mold of an injection mold as a film with a picture. In the case of a picture film with a base film, if it is inserted into a core mold of an injection mold and injection molding is performed, the film edge will be squeezed by the resin pressure and will enter the resin, and the film will be wrinkled and defective. There are many problems, and the cost of the film with pictures is high.

  This device was conceived in order to solve the above-mentioned problems in transparent tableware, and its purpose is to easily form a film with a picture and to sufficiently apply the resin pressure when molding the main body by injection molding. The object is to provide a tableware with a pattern made of a new transparent resin made of a single-layer film with a picture that is durable and surely integrated with the main body and hardly peels off by washing.

  This device for the above purpose comprises a tableware body made of injection-molded transparent resin, and a picture film inside the body made of a transparent film of the same resin as the main body, and the picture film is a single layer printed with a pattern on one side. The material film is formed by three-dimensionally forming a material film into a flange covering the opening edge of the main body and a band-shaped ring covering the inner peripheral surface of the main body by vacuum forming and punching. According to the lower end from the border, it is thin and has the above pattern on the outer surface, and the pattern is provided by coating the inner surface of the main body with a band-shaped ring body by integral molding of the picture film and the main body by insert molding. .

  The main body of the tableware and the picture film are made of a transparent resin of polycarbonate (PC), polypropylene (PP), polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), or oriented polystyrene (OPS), and are made of a material film. The wall thickness is 300 to 500 μm.

  In addition, the picture of the picture film is printed in a band shape concentrically with the opening of the main body in anticipation of elongation deformation due to three-dimensional molding in a portion formed in the band-shaped ring.

  In this device, the main body of the tableware and the picture film are made of the same transparent resin, so there is no difference in transparency between the main body and the picture film, and the close contact between them is good. The transparency of the main body is not inferior, and the form and color of the pattern on the inner surface of the main body can be seen clearly, so it becomes a tableware with a clear pattern combined with the gloss of the main body.

  In addition, since the film with a picture consists of a single-layer material film with a picture printed on one side, there is no delamination that tends to occur with laminated films when the picture film is three-dimensionally formed, and the boundary between the bent flange and the ring-shaped ring is also transparent. So it maintains the same transparency as the material film.

  In addition, since the thickness of the belt-shaped ring body is reduced according to the opening end, the step on the side surface of the core due to the opening end is so small that it is difficult to be swollen by the resin pressure, and the resin pressure is applied to the band-shaped ring body during the injection molding of the main body. Even if it acts, since the film is a single layer and the flange side fixed to the bottom of the cavity is thick, the occurrence of recumbency due to resin pressure is prevented, and the belt ring is pressed evenly against the core mold Since this is done, the close contact with the main body as well as the flange becomes tighter. As a result, the painted film does not squeeze out from the inner surface of the main body due to washing performed repeatedly each time the tableware is used, and there is no gap due to a gap, and the finish is comparable to glass-made transparent tableware, and the impact strength It is highly resistant to cracking, so it can withstand business use.

  In the figure, 1 is a cup body formed of a thermoplastic transparent resin, 2 is a picture film inside the body, and is made of a transparent film of the same resin as the body 1 and is integrally formed inside the body 1 with the pattern 3 on the outside. It is. As a result, the pattern 3 is provided on the inner surface of the main body in a state of being sandwiched between the main body 1 and the film 2 with a picture, thereby forming a transparent cup pattern.

  As shown in FIG. 3, the picture film 2 has a single-layer material film 2 ′ having a pattern 3 ′ printed on one side, a flange 2 a that covers the opening edge of the main body 1, and an inner peripheral surface of the main body 1. The belt-shaped ring body 2b is formed into a three-dimensional shape with the band-shaped ring body 2b to be coated, and the band-shaped ring body 2b is formed thin as it goes from the boundary of the flange 2a to the opening end.

  The thickness of the material film 2 ′ is determined in relation to the vertical width of the band-shaped ring body 2b, and the thickness distribution of the band-shaped ring body 2b formed by stretching at the time of three-dimensional molding becomes thin as the opening ends. Then, the film thickness is selected so that the film edge has a set thickness. When the film thickness is thicker than the set thickness, when a film with a picture is inserted into the core mold of the injection mold described later, a step difference from the peripheral surface of the core mold due to the film end is formed, and the film is bent by the resin pressure. It is because it becomes easy.

  Accordingly, the thickness of the material film 2 ′ of the picture film 2 with the short vertical width of the belt-like ring body 2b is inevitably thin, and when the vertical width is long, the thick film is used. In consideration of the bending strength of the flange 2a covering the open end, the thickness of the material film 2 ′ is preferably in the range of 300 to 500 μm.

  The pattern 3 'of the material film 2' is formed on the belt-like ring body 2b of the material film 2 'by making a plate-shaped printing surface concentrically with the opening of the main body 1 and allowing for elongation deformation by three-dimensional molding. The printed part is printed by offset printing using heat-resistant ink.

  As shown in FIG. 4A, first, the bottomed primary molded product 2 ″ is formed by vacuum forming as shown in FIG. 4A. Vacuum forming is not particularly different from known means, and is softened by heating. The material film 2 'is placed on the cavity of the vacuum forming apparatus 4 with the printing surface facing down, since the suction cavity is sized to match the inside of the upper portion of the main body 1, so that a belt-like printing surface is formed in the cavity opening. Alignment is performed so that the film is contained, and after the film edge is clamped, vacuum suction is performed.

  The raw material film 2 'is sucked into the cavity and formed into a primary molded product 2 ". This primary molded product 2" is formed into the cavity from the unformed film edge 2 "a and the inner edge of the film edge 2" a. It is a bowl-shaped device having a side portion 2 ″ b whose outer surface is bent and a bottom portion 2 ″ c connected to the side portion 2 ″ b. The thickness of the side portion 2 ″ b is the film edge. It is formed into a thin wall from the inner edge of 2 ″ a to the bottom.

  Next, trimming of the film edge 2 "a of the primary molded product 2" and punching of the bottom 2 "c are performed by known means. Trimming of the film edge 2" a is made to a dimension that covers the opening end of the main body 1. Further, the bottom 2 ″ c is punched along the inner surface. As a result, the bottom 2 ″ c is formed thinly as it becomes the lower end from the boundary between the flange 2a and the flange 2a as shown in FIG. The three-dimensional picture-attached film 2 is formed by the band-like ring body 2b having the pattern 3 on the surface.

  The transparent resin for forming the main body 1 and the picture film 2 is a thermoplastic resin capable of injection molding of the main body 1, such as polycarbonate (PC), polypropylene (PP), polyethylene terephthalate (PET), polymethyl methacrylate (PMMA). ), Oriented polystyrene (OPS) can be employed. If the main body 1 and the picture film 2 are made of the same transparent resin, the refractive index is the same, so even if there is the picture film 2 on the inside, the transparency of the main body 1 is not affected. Since the colors look vivid, it becomes a tableware with a clear pattern combined with the gloss of the main body 1.

The integral molding of the main body 1 and the picture film 2 can be performed by inserting the picture film 2 in the injection molding of the main body 1.
FIG. 5 illustrates the state in which the picture film 2 is inserted into the injection mold of the cup body. The injection mold is a cavity mold 5 that molds the outer surface of the cup body, and a core that forms the inner surface of the cup body. It consists of a mold 6 and has a normal structure for molding a cup body by injecting and filling molten resin from a sprue bush 8 into a body molding cavity 7 formed by closing both molds.

  The insert of the picture film 2 is fixed to the bottom surface of the cavity by fitting the belt-like ring body 2b to the base end of the core mold 6 with the opening on the flange side as the insertion side when both molds are opened. The inner diameter of the band-shaped ring body 2b is formed so as to match the outer diameter of the base portion of the core mold 6 when the primary molded product 2 ″ is formed, and the band-shaped ring body 2b becomes thinner as it becomes the open end. Since it is formed, the step on the peripheral side surface of the core due to the film end is very small and is difficult to be swollen by the resin pressure, and the contact with the core surface of the belt-like ring body 2b is also close, so that it can sufficiently withstand the resin pressure. Since the flange side is thick, the belt-like ring body 2b is not deformed at the time of insertion, and can be reliably inserted into the set position.

  After the picture film 2 is inserted, the cavity mold 5 and the core mold 6 are closed and clamped, and molten resin is injected into the cavity 7 to mold the main body (not shown). Resin pressure acts on the belt-like ring body 2b of the picture-attached film 2, but the occurrence of wrinkles due to resin pressure is prevented from the fact that the film is a single layer and the thickness distribution that the flange side fixed to the cavity bottom is thick, The belt-like ring body 2b is pressed evenly against the core mold 6 and comes into close contact with the molten resin. As a result, as shown in FIG. 2, the picture film 2 is integrated with the main body 1 in a state of covering the inner side from the opening end of the main body, and the pattern 3 is provided on the inner surface of the main body in a state of being covered with the belt-like ring body 2b. It becomes a transparent cup with a pattern illustrated in FIG.

  Although the said embodiment demonstrated the cup containing a picture as an example of a drinking container, not only transparent drinking containers other than a cup but also transparent tableware such as a side dish case and a candy case are used on a table. If it is the tableware of the form which can insert a pattern film, it can be comprised similarly to the said embodiment.

It is a perspective view of a cup with a pattern of transparent resin by this device. It is a principal part expanded sectional view same as the above. It is a surface view of the material film which printed the pattern. It is explanatory drawing of the three-dimensional shaping | molding of a film with a picture. It is sectional drawing of the injection die which inserted the film with a picture.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cup body 2 Film with picture 2a Flange 2b Band-shaped ring 2 'Material film 2 "Primary molded product 3, 3' pattern 4 Vacuum forming device 5 Cavity type 6 Core type 7 Cavity

Claims (3)

It consists of a main body of tableware made of injection-molded transparent resin, and a picture film inside the main body made of a transparent film of the same resin as the main body.
The film with a picture is three-dimensionally formed by vacuum forming and punching a single-layer material film with a pattern printed on one side into a flange that covers the opening edge of the main body and a belt-shaped ring that covers the inner peripheral surface of the main body Made up of
The belt-like ring is thin and has the picture on the outer surface as it goes from the border of the flange to the bottom, and the picture is covered with the belt-like ring on the inner surface of the body by integral molding of the picture film and the body by insert molding. A tableware with a pattern made of transparent resin.   The main body of the tableware and the picture film are made of a transparent resin of polycarbonate (PC), polypropylene (PP), polyethylene terephthalate (PET), polystyrene (PS), and the thickness of the material film is 300 to 500 μm. The tableware with a pattern by the transparent resin of Claim 1 characterized by the above-mentioned.   2. The transparent resin according to claim 1, wherein the pattern of the picture film is printed in a strip shape concentrically with the opening of the main body in anticipation of elongation deformation due to three-dimensional molding in a portion formed in the belt-shaped ring. Tableware with a picture.

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