JP3836238B2 - Molding method for synthetic resin molded products - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a method for molding a synthetic resin molded product, and more particularly to a method for molding a synthetic resin molded product having added values such as decorativeness by forming patterns and characters on the synthetic resin molded product with ink.
[0002]
[Prior art]
As a method of attaching patterns and characters to this type of synthetic resin molded product, in injection molding and blow molding, an in-mold method in which a label pre-adsorbed in a mold cavity during molding is adhered to the surface of the molded product, After the molding, the surface of the molded product is subjected to printing on the surface. In the case of an inflation film, the surface of the film is printed after being formed.
[0003]
[Problems to be solved by the invention]
In the conventional method, the in-mold method complicates the mold structure and requires label supply, suction, and cutting processes. The molding method is complicated, and the blow-molded product has complex irregularities. In some cases, the label may not adhere well, and the molding method is difficult. In addition, the method of performing surface treatment of a molded product after molding and printing on the surface takes too much time and causes an increase in cost of the molded product. As an improvement of the above, in blow molding, there is also a method of discharging a multilayer parison from the blow die head to form a blow molded product with different colors on the front and back surfaces, but the structure of the blow die head is complicated and connected to this blow die head. The number of extrusion molding machines increases, and the molding method tends to be complicated.
In addition, in the case of an inflation film, in the method of printing on the surface of the film after molding, when the inflation film is printed on both sides of the gusset, both sides of the gusset fold are printed. It is impossible and there is room for improvement. The present invention improves the drawbacks of the prior art, and simply adds a pattern or letters to a synthetic resin molded product material or its molded product, thereby obtaining a synthetic resin molded product having added value such as decorativeness. The purpose is to be able to.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, the specific invention is characterized in that, in the stage before molding a synthetic resin molded product, ink is sprayed on the surface of the synthetic resin material that is the material of the molded product to form characters. The product is an inflation film, and behind the frost line at the time of forming this film, several printing devices including ink jet type ink jet nozzles are arranged on the outer peripheral surface of the bubble B with a gap in the circumferential direction. According to the ink jet nozzle of the printing device, ink is sprayed on the outer peripheral surface of the bubble according to the film take-off speed, and characters including the company name, its abbreviation, and its location are formed on the outer peripheral surface of the bubble. This is a method for molding a synthetic resin molded product.
[0005]
In order to achieve the above object, according to a related invention, before molding a synthetic resin molded product, at least one of a pattern and characters is formed by spraying ink on the surface of the synthetic resin material that is the material of the molded product. In this case, the synthetic resin molded product is used as a blow molded product, and the ink is sprayed onto the parison surface discharged from the blow die head before the mold is closed.
[0006]
【The invention's effect】
According to the specific invention, it is possible to accurately mold a synthetic resin molded product having an added value such as decorativeness with high-quality characters, regardless of the presence or absence of the uneven shape of the molded product.
[0007]
In particular, when the inflation film is folded on both sides of the gusset by spraying ink on the outer peripheral surface of the bubble at the rear of the frost line when forming the inflation film to form a letter including the company name, its abbreviation, and its location. However, it is possible to easily form an inflation film with characters on both side gusset folds.
[0008]
According to a second aspect of the present invention, the synthetic resin molded product is used as a blow molded product, and before the mold is closed, ink is sprayed onto the parison surface discharged from the blow die head above the mold, thereby forming a pattern or a character. Therefore, it is possible to use a normal mold as compared with the in-mold method, and without the need for label supply, suction, and cutting, the surface of the parison is used. By blowing ink, at least one of a pattern and a character can be formed, and a blow-molded product having added value such as a decorative property with at least one of the pattern and the character can be formed with high quality.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1
This embodiment is a typical embodiment of an apparatus for carrying out the method invention described in claim 1. In FIG. 1, A shows a molding apparatus for molding an inflation film F which is a kind of synthetic resin product.
Reference numeral 10 denotes a circular mold forming die of the forming apparatus A. Bubble B discharged from the annular discharge port 11 of the forming die 10 is expanded to a desired diameter by a frost line by air, and is formed as a tube rough film by an inclined guide plate 12. While being guided by a pair of nip rollers 13, folded into two as a flat film and taken up by a winding device (not shown), both side edges of the tube rough film are gusset-folded to form a bag making machine (not shown). ) May be supplied directly.
[0010]
In the vicinity of the frost line, four printing devices 14 including ink jet type (for example, bubble ink jet type) ink jet nozzles are arranged on the outer peripheral surface of the bubble B at intervals in the circumferential direction. The printing device 14 is configured to draw characters including a company name, its abbreviation, and its location on the outer peripheral surface at a predetermined location according to the film take-off speed.
[0011]
In order to explain the operation of this apparatus, when the bubble B discharged from the forming die 10 is inflated with air to a desired diameter and folded into two as a tube film, the printing apparatus is disposed behind the frost line. 14, ink is sprayed on the outer peripheral surface of the bubble B to form characters. In this manner, a tube rough film in which characters are formed at predetermined positions is formed.
[0012]
Embodiment 2
This embodiment is a typical embodiment of an apparatus for carrying out the method invention of claim 3. In FIG. 2, A1 shows a blow molding apparatus. Reference numeral 10A denotes a blow die head of the blow molding apparatus A1, and a pair of molds 20 that can be opened and closed is provided below the blow die head 10A. Near the annular discharge port 21 of the blow die head 10A, a printing device 14 including an ink jet nozzle of an ink jet system is disposed between the blow die head 10A and the mold 20 (see FIG. 2). The printing apparatus 14 including the ink jet nozzles of the ink jet system is configured to draw a pattern and characters on the outer peripheral surface of the parison P discharged from the outlet 21 at a predetermined position according to the extrusion or ejection speed of the parison P. In order to explain the operation of this apparatus, in the state where the mold 20 is opened, the printing apparatus 14 sprays ink on the outer peripheral surface of the parison P extruded or ejected from the annular discharge port 21 of the blow die head 10A. Form letters. Next, the parison P on which patterns and characters are formed is supplied to the mold 20 and then the mold 20 is closed. Next, air is blown into the parison P accommodated in the mold 20 and blow-molded. Along with this blow molding, the pattern and characters are deformed with the shape of the blow molded product, the pattern is slightly faded, and the characters are readable.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a first embodiment.
FIG. 2 is a schematic diagram of a second embodiment.
[Explanation of symbols]
10 Circular mold die 10A Blow die head 14 Printing device

Claims (2)

  Before forming a synthetic resin molded product, when the ink is sprayed on the surface of the synthetic resin material that is the material of the molded product to form characters, the synthetic resin molded product is used as an inflation film. Behind the frost line, several printing devices including ink jet type ink jet nozzles are arranged on the outer peripheral surface of the bubble B at intervals in the circumferential direction, and the film is taken out from the ink jet nozzles of these printing devices. A method for molding a synthetic resin molded product, wherein ink is sprayed on an outer peripheral surface of a bubble according to speed to form characters including a company name, an abbreviation, and a location on the outer peripheral surface of the bubble.   Before forming a synthetic resin molded product, when the ink is sprayed onto the surface of the synthetic resin material which is the material of the molded product to form at least one of a pattern and a character, the synthetic resin molded product is blow molded product As a method for molding a synthetic resin molded article, the ink is sprayed onto the parison surface discharged from the blow die head above the mold before the mold is closed.

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