JPH0696261B2 - Hollow molded article decorating method and decorating apparatus thereof - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for decorating a hollow molded article made of polyethylene, polyvinyl chloride or the like, and a decorating apparatus therefor.

"Prior Art" Conventionally, as a method for decorating a hollow molded article made of polyethylene, polyvinyl chloride or the like and a decorating apparatus therefor, silk screen printing, hot stamping, thermal transfer and the like are known.

“Problems to be Solved by the Invention” However, the conventional decorating method and decorating apparatus have the following problems.

That is, in the case of screen printing, it is necessary to subject the surface to be printed to a surface frame treatment before printing, and it takes time to decorate because the ink dries slowly, and in addition, it is possible to print pictures with beautiful gradation and tone. There was a problem that was not suitable.

Also, in the case of hot stamping or thermal transfer, the internal volume of the hollow molded product may change due to thermal deformation, and since the hollow molded product is rejected by the pressing force during decoration, the inside of the hollow molded product is There is a problem that the decoration process is complicated because it is necessary to put and hold compressed air.

The present invention has been proposed based on such a background, and a method and a method for easily decorating the surface of a hollow molded product with a beautiful gradation, a color tone pattern, etc. without changing the internal capacity. It is intended to provide a decoration device.

"Means for Solving Problems" In the method for decorating a hollow molded article according to the present invention, a transfer foil having a print layer of a printed matter to be decorated on the hollow molded article is formed on a base sheet, and Using a mold for molding a hollow molded product, guide the transfer foil into the cavity of the mold while the mold is being opened, and at the position of the cavity corresponding to the position where the hollow molded product is decorated. The printing layers are combined, at the same time a hollow synthetic resin material is inserted into the mold, the mold is closed, and a gas is sent to the synthetic resin material to inflate it.
The printing layer is transferred to the hollow molded product at the same time when the hollow molded product is molded.

The decorating device for a hollow molded product includes a mold for molding the hollow molded product, and a belt-shaped transfer foil supply unit and a winding unit on which a printing layer is formed. A first mold and a second mold which can be freely separated from and contacted with each other, and one or both of the first mold and the second mold has a first mold and a second mold. A gap is formed along the inner surface of the cavity formed when the mold is brought into close contact with the transfer foil.

"Embodiment" An embodiment of a method for decorating a hollow molded article and a decorating apparatus therefor according to the present invention will be described with reference to Figs. 1 to 6.

In FIG. 1, reference numeral 1 is a decorating device for hollow molded products (hereinafter abbreviated as decorating device). This decorating device 1 includes a mold 2, a feeding unit 4 for a transfer foil 3, a winding unit 5, a pair of guide rollers 6a and 6b, and a pair of foil tensioners 7a and 7b for clamping a hollow molding machine. It is attached to the device.

The mold clamping device of the blow molding machine is composed of a pair of die plates A and B whose mold mounting surfaces are opposed to each other in parallel, and mold clamping units C and D which respectively hold the die plates A and B. . In this mold clamping device, a mold is attached to the die set plates A and B to open and close the mold.

The mold 2 is composed of a first mold 8 and a second mold 9. When the first mold 8 and the second mold 9 are brought into close contact with each other on the parting surface 2a. The cavity 2b is formed. As shown in FIG. 3, the first mold 8 has a holding plate 10 and a moving plate 11 which are divided by a parting surface 8a along the inner surface of the cavity 2b, and separates the holding plate 10 and the moving plate 11 from each other. Guide pins 12 that freely connect, also holding blade 10 and moving plate
And a coil-shaped spring 13 which is sandwiched between 11 and 11 and urges both in the separating direction. Holding plate
10 is a small-diameter protrusion 10a, 10a, 10a, at four corners of the parting surface 8a,
10a are formed, a stepped portion 10b and a large diameter hole portion 10c penetrating downward are formed in the lower part of these small diameter hole portions 10a, and locking hole portions 10d are formed in the vicinity of each small diameter hole portion 10a. The mounting surface 10e is formed on the surface facing the partitioning surface 8a. The moving plate 11 has a partitioning surface 8a.
Female screws 11a are formed at positions corresponding to the small diameter holes 10a of the holding plate 10, respectively, and the locking holes 10d of the holding plate 10 are formed.
The engaging hole portions 11b are formed at the positions corresponding to. The guide pin 12 forms a small diameter cylindrical portion 12a that fits in the small diameter hole portion 10a and slides precisely, forms a male screw 12b at one end of the small diameter cylindrical portion 12a, and forms a stepped portion 12c and a large diameter at the other end. A cylindrical portion 12d is formed, and a hexagonal hole 12e is formed on the end surface of the large-diameter cylindrical portion 12d.

In the first mold 8, the spring 13 has locking holes 10d and 11b.
And the guide pin 12 is inserted from the large diameter hole portion 10c, the male screw 12b portion is screwed and fixed to the female screw 11a portion, and the small diameter hole portion 10a is fixed by the spring 13.
The stepped portion 10b is locked to the stepped portion 12c of the guide pin 12 in a biased state, and the holding plate 10 and the moving plate 11 are assembled so as to be separable from each other. In the first mold 8, the stepped portion of the guide pin 12 is provided on the parting surface 8a in the mold open state.
A gap 8b is formed which is limited by 12c.

A mounting surface 9a is formed on the surface of the second mold 9 that faces the parting surface 2a.

The mold 2 is a die plate for each of the mounting surfaces 10e and 9a.
It is fixed to the mold mounting surface of A and B.

The transfer foil 3 is formed by forming a decorative layer 15 on a base sheet 14 at regular intervals. The base sheet 14 is formed of a film of polyethylene, polypropylene or the like in a strip shape. The base sheet 14 serves as a support for the decorative layer 15. As shown in FIG. 4, the decorative layer 15 is formed by sequentially laminating a release layer 15a, a printing layer 15b, and an adhesive layer 15c on a base sheet 14. The release layer 15a is coated with a thermosetting acrylic resin or the like by a usual coating method. The printing layer 15b is
It is printed by a normal printing method such as gravure printing or screen printing. The adhesive layer 15c is coated with an epoxy resin or the like by a usual coating method.

As shown in FIGS. 1 and 2, the supply unit 4 has holding units 17, 17 having a long hole 16 arranged vertically, and a rotatable roller 18 is attached to the long hole 16. The transfer foil 3 is wound around the roller 18 and stored. The above-mentioned supply unit 4 is vertically positioned so that the transfer foil 3 is horizontally supplied to one side of the gap 8b of the first mold 8, and the holding units 17 and 17 are provided with the mold clamping unit c. It is attached to one side.

The winding unit 5 also has the same configuration as the supply unit 4, and the same components are denoted by the same reference numerals in the drawings. The winding unit 5 is vertically positioned so that the transfer foil 3 is horizontally wound from the other side of the gap 8b of the first mold, and the holding units 17 and 17 are fixed to the mold clamping unit c. Is attached to the other side of the.

The guide rollers 6a, 6a support the roller 20 rotatably between the holding portions 19, 19 arranged vertically. The guide rollers 6a, 6a are wound on the transfer foil 3 supplied from the supply unit 4 and inserted into the gap 8b in parallel with the parting surface 8a so that one of the first mold 8 and the other of the first mold 8 are inserted. The holding portions 19, 19 are attached to the side surfaces of the.

In the foil tensioners 7a and 7b, holding portions 22 and 22 each having a long hole 21 are arranged vertically, and a rotatable roller 23 is attached to the long hole 21. These foil tensioners 7a, 7b have holding portions 22, 22 attached to one and the other side surfaces of the die-set plate A, respectively. These foil tensioners 7a and 7b move the mounting position of the roller 23 along the long hole 21 to push the transfer foil 3 to the outside to prevent the slack.

A method of decorating a hollow molded article with the decorating device having the above configuration will be described.

First, the transfer foil 3 is housed in the supply unit 4, and the transfer foil 3 is wound from the supply unit 4 around the foil tensioner 7a, the guide rollers 6a, 6b, and the foil tensioner 7b, and the tip of the transfer foil 3 is wound around the winding unit 5. Roll up.

Next, with the mold 2 open, the transfer foil 3 is fed by synchronously rotating the rollers 18 of the supply section 4 and the winding section 5 by a drive mechanism (not shown), and as shown in FIG. The decorative layer 15 is provided on the inner surface of the cavity 2b corresponding to the position to be decorated.
Match. At the same time, the heated hollow synthetic resin material R is inserted into the mold 2.

Next, the mold 2 is closed. When the mold 2 is closed, the holding plate 10 and the moving plate 11 are transferred to the transfer foil 3 as shown in FIG.
The transfer foil 3 is fixed by sandwiching them and fixing them.

Next, a high-temperature, high-pressure air or other gas is sent to the synthetic resin material R to blow it up to form a hollow molded article S. At this time,
The surface of the hollow molded product S is pressed against the decorative layer 15 of the transfer foil 3, and the decorative layer 15 is bonded by the heat of the hollow molded product S.

Next, when the mold 2 is opened, the hollow molded product S is taken out, and at this time, the release layer 15a of the decorative layer 15 is separated from the base sheet 14 and the printing layer 15b is transferred.

Next, the rollers 18 of the supply unit 4 and the winding unit 5 are synchronously rotated again, the transfer foil 3 is fed, and the decorative layer 15 is aligned with the inner surface position of the cavity 2b corresponding to the position where the hollow molded product is decorated. .

Hereinafter, a hollow molded article with a decoration is produced by repeating the above steps.

According to the decorating device as described above, the printing layer 3b is transferred by pressing force and heat for blowing the hollow molded product in the step of molding the hollow molded product by putting the transfer foil 3 in a mold. Therefore, the decorating step can be greatly reduced compared to the method of decorating in the subsequent step by screen printing, hot stamping or the like. Further, since there is no need to apply heat after molding as in the case of a hot stamp, it is possible to obtain a hollow molded product having a uniform content. Furthermore, since the printing layer 15b formed on the transfer foil 3 can be printed by gravure printing, it is possible to decorate the hollow molded product with a picture of beautiful gradation and color tone. Furthermore, even if the surface of the hollow molded article has a complicated curved surface, the transfer foil 3 adheres closely to the curved surface, so that the curved surface can be decorated. Further, the decorating layer 15 of the transfer foil 3 is sequentially transferred to the mold 2 by rotating the supply unit 4 and the roller unit 18 of the winding unit 5 in synchronization.
Since it can be easily sent inside, the delay of the molding cycle of the hollow molded product due to the decoration can be minimized.

[Effect of the Invention] According to the method for decorating a hollow molded article according to the present invention, the printing layer is hollow molded in the step of molding the hollow molded article by inserting the transfer foil having the print layer into the mold. Since it is transferred to the product, it is possible to significantly reduce the decorating step as compared with the method of decorating in a subsequent step by silk screen printing, hot stamping or the like. Further, since there is no need to apply heat after molding as in the case of a hot stamp, it is possible to obtain a hollow molded product having a uniform content. Further, since the printing layer can be printed by gravure printing as well, it is possible to decorate the hollow molded product with a design such as a beautiful gradation and color tone. Furthermore, even if the surface of the hollow molded article has a complicated curved surface, the transfer foil adheres along the curved surface, so that the complicated curved surface can be decorated.

On the other hand, according to the decorating device of the hollow molded product, the decorating layer of the transfer foil can be successively fed into the mold easily by synchronously rotating the roller portions of the supply unit and the winding unit. It is possible to minimize the delay of the molding cycle of the hollow molded product due to the decoration.

[Brief description of drawings]

1 is a plan view of a decorating device for hollow molded articles according to the present invention, FIG. 2 is a front view of the decorating device, and FIG. 3 is a cross-sectional view of a main part of a first die of the decorating device. FIG. 4 is a sectional view of a main part of a transfer foil of the decorating device, and FIGS. 5 and 6 are explanatory views showing a method for decorating a hollow molded product according to the present invention. 2 ... Mold, 2b ... Cavity, 3 ... Transfer foil, 4 ...
Supply unit, 5 ... Winding unit, 8 ... First mold, 8b ... Gap, 9 ... Second mold, 14 ... Base sheet, 15b ... Printing layer, R ... Synthetic resin Material, S ... Hollow molded product.

Claims (2)

[Claims] 1. A method for decorating a hollow molded product with a printed matter, wherein a transfer foil having a printed layer corresponding to the printed matter is formed on a base sheet, and a mold for molding the hollow molded product is being opened. Guide the above transfer foil into the cavity of the same mold,
Align the printing layer to the position of the cavity corresponding to the position to decorate the hollow molded product, at the same time insert a hollow synthetic resin material into the mold, close the mold and gas the synthetic resin material. Is blown and blown to form the hollow molded article, and at the same time, the printing layer is transferred to the hollow molded article. 2. A mold for molding a hollow molded article, and a supply unit and a winding unit for a belt-shaped transfer foil on which a printing layer is formed. The mold is detachable from each other. First mold, second
And the inner surface of the cavity formed when the second die is brought into close contact with the first die, either or both of the first die and the second die. A device for decorating a hollow molded article, characterized in that a gap is formed along the transfer foil.