JP5378761B2 - Information printing method on resin surface by inkjet printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information printing method onto a resin surface by an inkjet printer which can print information on the resin surface with a high adhesion degree, by the inkjet printer. <P>SOLUTION: This information printing method includes an information printing stage (S11) and an adhering stage (12). In this case, in the information printing state (S11), information is printed on the resin surface by the inkjet printer. In the adhering stage (S12), an ink for forming the information and the resin are adhered by adding a heating value by which the resin melts onto the information printed surface being the resin on which the information has been printed in the information printing stage (S11). <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a method for printing information on a resin surface using an ink jet printer, and more particularly, to a method for printing information on the surface of a resin container or a container laminated with resin.

  Many products are required by law to display information such as manufacturer information, date of manufacture, and expiration date.

  Since many of these products are packaged in resin containers or containers laminated with resin, it is necessary to display information on the resin surface, but in the past, rubber stamps, metal stamps, and metal baked seals The information was stamped with a seal such as.

  However, recently, from the viewpoint of quality control such as ensuring traceability, the information to be displayed has increased and complicated, making it difficult to respond with a seal.

  In order to solve this problem, printing by an ink jet printer capable of changing information to be displayed arbitrarily and quickly has become mainstream (see, for example, Patent Document 1).

The invention disclosed in Patent Document 1 relates to a printer for packaging that prints information on a wrap film used for packaging food, and the storage date, preserving person, etc. when storing the food in a refrigerator or the like. It is intended to be easily printed on a wrap film.
Japanese Patent Laying-Open No. 2001-232862 ([0015], FIGS. 7 and 8)

However, printing information on a resin surface by an ink jet printer has the following problems.
1. The degree of adhesion between the printed information and the packaging container is not sufficient. In particular, when the packaging container is made of resin, the lack of adhesion becomes remarkable when the packaging container is laminated with resin.
2. For this reason, when the print surface comes into contact with another object, it is impossible to avoid the deterioration of the sharpness of the print information.
3. It cannot be avoided that the print information is erased by a solvent such as thinner or alcohol.
4). For this reason, the possibility that information is falsified cannot be denied.

  In addition, as described in the above-mentioned patent document 1, even if “uses ink having high affinity with the wrap film in order to prevent the printed surface from being faint and difficult to see”, the information is erased by wiping with a solvent. It is difficult to avoid this.

  The present invention has been made to solve the above problems, and provides an information printing method on a resin surface by an ink jet printer that can print information on the resin surface with high adhesion by an ink jet printer. Objective.

  An information printing method on a resin surface by an ink jet printer according to the present invention includes an information printing step of printing information on a resin surface by an ink jet printer, and the resin surface is melted on the resin surface on which information is printed in the information printing step. And an adhesion step in which the ink for forming the information and the resin are adhered to each other by applying an amount of heat.

  An information printing method on a resin surface by an ink jet printer according to the present invention includes an information printing step of printing information on a resin surface by an ink jet printer, a resin on the resin surface on which information is printed in the information printing step, and the information. After the amount of heat that melts the ink particles to be formed is added, the heating is stopped and the ink for forming the information and the resin are brought into close contact with each other by resolidification.

  With this configuration, information can be printed on the resin surface with a high degree of adhesion by an ink jet printer.

  The information printing method on the resin surface by the ink jet printer according to the present invention has a configuration in which the adhesion step adds heat to the resin surface by injecting hot air onto the resin surface.

  The information printing method on the resin surface by the ink jet printer according to the present invention has a configuration in which the adhesion step applies a heat amount to the resin surface by pressing a heat generating source against the resin surface.

  The information printing method on the resin surface by the ink jet printer according to the present invention has a configuration in which the adhesion step applies heat to the resin surface by irradiating the resin surface with radiant heat from a heat source.

  The present invention provides an adhesion step in which an ink for forming information is brought into close contact with the resin surface by applying a heat amount for melting the resin surface to the resin surface on which information is printed, thereby providing information with high adhesion to the resin surface by an ink jet printer. It is possible to provide a method for printing information on a resin surface by an ink jet printer having an effect that printing can be performed.

  Hereinafter, an embodiment of an information printing method on a resin surface by an ink jet printer according to the present invention will be described with reference to the drawings.

  The information printing method on the resin surface by the ink jet printer according to the present invention includes an information printing step (S11) for printing information on the resin surface by the ink jet printer and an information printing step (S11) as shown in the flowchart of FIG. An adhesion step (S12) of adding an amount of heat that melts the resin surface to the resin surface on which the information is printed to closely contact the ink forming the information and the resin.

  FIG. 2 is a perspective view of a milk pack manufacturing facility to which an information printing method on a resin surface by an ink jet printer according to the present invention is applied. A milk pack 1 filled with milk and sealed with an inlet is moved by a belt conveyor 2. It is conveyed in the direction of the arrow.

  The ink jet printer 3 prints information necessary for a predetermined portion (for example, a sealed inlet, a milk pack side surface, etc.), for example, a manufacturing date as a set of ink particles.

  In order to check whether or not the information has been printed clearly, a print evaluation device (not shown) may be installed downstream of the inkjet printer 3 so as to exclude milk packs with unclear printing.

  The air heater 4 is a facility for applying a heat amount that melts at least the laminate material of the resin material (information printing surface) on which the information is printed and the ink particles forming the information, and an air source (not shown). The air supplied through the pressure adjusting valve 43 and the flow rate adjusting valve 44 is heated by the electric power supplied from the power source (not shown) through the controller 42 to form hot air, and the hot air is supplied through the nozzle 41. Spray onto the information printing surface.

  Next, the operation of the milk pack manufacturing facility will be described.

  When the milk pack 1 passes in front of the inkjet printer 3, the date of manufacture is printed by the inkjet printer 3 on the sealed inlet of the milk pack 1.

  Since the ink ejected from the ink jet printer 3 is generally quick-drying, the ink particles are solidified in a very short time, and information formed by the aggregate of the ink particles is printed on the laminate material. Become.

  When the milk pack 1 is transported by the belt conveyor 2 and arrives in front of the air heater 4, the hot air blown from the nozzle 41 of the air heater 4 causes the information printing surface to have a laminate material present on the information printing surface and ink particles forming information. Of these, at least an amount of heat for melting the laminate material is applied.

  By this heating, the information printing surface is heated to at least a temperature at which the laminate material melts (for example, 300 degrees Celsius).

  The amount of heat to be applied to the information printing surface varies depending on the traveling speed of the belt conveyor 2, the area of the information printing surface, the thickness of the laminate material, the material of the laminate material, etc. Is desirable.

  Then, ink particles that form information sink into the molten laminate material. When the milk pack 1 is further conveyed by the belt conveyor 2 and leaves the heating zone, the laminate material is solidified again in a state where most of the ink is submerged in the laminate material, so that the adhesion between the ink and the laminate material is improved.

  In some cases, the ink particles forming information are melted by heating, but in this case, a region where both are mixed is formed by re-solidification, and the adhesion between the ink and the laminate material is further improved.

  The effect of the information printing method on the resin surface by the ink jet printer according to the present invention was confirmed under the following conditions.

Travel speed of the belt conveyor 2: 6 meters per minute Temperature set by the controller 42 of the air heater 4: 750 degrees Celsius Diameter of the nozzle 41: 11 mm Distance between the tip of the nozzle 41 and the information printing surface: 6 mm Information printing surface length: 32 Millimeter Information printing surface heating time (nozzle diameter passage time of information printing surface): 0.11 seconds As a result of printing under the above conditions, printing is performed as a result of removing ink remaining on the resin surface even if the resin surface is wiped with a solvent Although the information was somewhat thin, it was confirmed that the visibility was not impaired.

  Moreover, as a result of observing the information printing surface with a microscope, it can be confirmed that there is a mixed region between the ink particles forming the information and the resin, and not only the resin but also the surface of the ink particles are melted and re-solidified. Turned out to be. In this case, it was also confirmed that the visibility of information as a collection of ink particles was not affected.

  In an actual production site, the traveling speed of the belt conveyor is generally about 18 meters per minute. In this case, information printing is performed by increasing the nozzle diameter, increasing the set temperature, or the like. It is necessary to triple the amount of heat supplied to the surface.

  As described above, according to the information printing method on the resin surface by the ink jet printer according to the present invention, the degree of adhesion between the information and the resin is improved, so that the printing is unclear due to contact between the information printing surface and another object. In addition to preventing the data from being erased, it becomes difficult to erase the information with the solvent, and the falsification of the information can be prevented.

  In the above-described embodiment, the information printing surface is heated by jetting hot air with an air heater, but heat may be applied to the information printing surface by radiant heat such as a halogen heater or flame.

  Further, the information printing surface may be sandwiched between high temperature rollers to apply heat to the information printing surface.

  In the above-described embodiment, the case where information is printed on a milk pack has been described. It goes without saying that can be applied.

  In particular, even when cup-shaped packaging containers with information printed on the lid are stacked and stored in a cardboard box for transportation, the information printed on the lid can be prevented from disappearing or becoming unclear. .

  As described above, the information printing method on the resin surface by the ink jet printer according to the present invention has an effect that the degree of adhesion of the printed information to the packaging container can be improved, and the information printing method on the resin surface It is effective as

3 is a flowchart of the present invention. 1 is a perspective view of a milk pack manufacturing facility to which the present invention is applied.

Explanation of symbols

1 Milk Pack 2 Belt Conveyor 3 Inkjet Printer 4 Air Heater

Claims (1)

A method of printing information on a resin surface of a resin container or a resin-laminated container,
An information printing stage for printing information on a resin surface with an inkjet printer;
The amount of heat that melts the resin on the resin surface on which information is printed in the information printing stage and the ink particles that form the information is added by spraying hot air onto the resin surface, and then heating is stopped to form the information. A method for printing information on a resin surface of a resin container or a resin-laminated container by an ink jet printer, including an adhesion step in which the ink to be adhered and the resin are in close contact by re-solidification.

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