JP2007319734A - Method for preparing glass container having electrostatic coating film and apparatus for electrostatically coating glass container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for preparing a glass container having an electrostatic coating film and having an excellent effect of good design and a sense of high quality, and a very simple-structured apparatus for electrostatically coating a glass container capable of forming a coating film in a stable manner. <P>SOLUTION: The method for preparing a glass container having an electrostatic coating film comprises steps of holding a glass container 11 equipped with an opening 12 upside down keeping the opening 12 open, retractably inserting an electrode member 45 into the inside 13 of the glass container 11 through the opening 12, causing the glass container 11 to rotate, and causing a powder paint 65 to stick to the surface 14 of the glass container 11 using a spray member 61 reciprocating in the height direction 11A of the glass container 11 held upside down to form a coating film 15. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a glass container having an electrostatic coating film and an electrostatic coating apparatus for the glass container.

  Conventionally, spray coating using a liquid paint has been performed as a glass coating method. According to this spray coating, a thin and uniform coating film can be formed on the glass surface. However, the coating surface is generally flat and monotonous, and the paint is scattered in a large amount in places other than the object to be coated. As a result, a large amount of paint was wasted.

  Therefore, an electrostatic coating method is known as an efficient coating method with little waste of paint. This electrostatic coating method is mainly used as a coating method for conductive materials such as metals, and the coating film can be thickened by using a powder coating material. In recent years, attempts have been made to use it as a coating method for glass, which is a non-conductive material.

For example, there is an electrostatic coating method in which a paint is stably adhered by providing an energization treatment layer made of an energization treatment liquid containing a surfactant on the surface of a glass container (see, for example, Patent Document 1). However, such an electrostatic coating method has problems such as a complicated manufacturing process and an increase in cost, and it is very difficult to apply electrostatic coating to glass, which is a nonconductive material, with a simple configuration. there were. In addition, it was difficult to obtain a high-quality coating film with high design.
JP 2004-284664 A

  The present invention has been made in view of the above points, and it is possible to stably and easily produce a glass container with a very simple structure and a method for producing a glass container having an electrostatic coating film having a high design effect and a high-class feeling. An electrostatic coating apparatus for a glass container capable of forming an electrostatic coating film is provided.

  That is, the invention of claim 1 opens the opening of the glass container having an opening and holds it in an inverted manner, and inserts an electrode member into the container from the opening of the glass container so as to be freely inserted and removed. An electrostatic device characterized in that a coating film is formed on a glass container surface by rotating a container made and the powder coating material is attached to the surface of the glass container by a spraying member that reciprocates in the height direction of the inverted glass container. The present invention relates to a method for producing a glass container having a coating film.

  Further, the invention of claim 2 is the invention according to claim 1, wherein after the powder coating is adhered by the spray member, the coating film on the glass container surface is partially removed to create a non-coating portion on the glass container surface. The manufacturing method of the glass container which has the electrostatic coating film of this.

  Furthermore, the invention of claim 3 is a mouth holding member that opens and holds the opening of the glass container having an opening, and an electrode member that can be inserted into and removed from the opening of the glass container into the container. Powder coating material by means of an electrode member inserting device to be inserted, a rotating device for rotating the mouth holding member to rotate the glass container, and a spraying member which reciprocates in the height direction of the inverted glass container And a paint spraying device for adhering a glass container surface to the glass container surface.

  According to the method for manufacturing a glass container having an electrostatic coating film according to the invention of claim 1, the opening of the glass container having an opening is opened and held upside down, and the glass container is opened from the opening of the glass container. The electrode member is detachably inserted into the container, the glass container is rotated, and the powder coating is attached to the surface of the glass container by a spraying member that reciprocates in the height direction of the glass container held in an inverted manner. Therefore, even if it is a glass container which is a non-conductive material, an electrostatic coating film can be formed very simply and easily. It is also possible to obtain a glass container having an electrostatic coating film with a high-class feeling and texture.

  According to invention of Claim 2, in Claim 1, after adhesion of the powder coating material by the said spray member, the coating film of the glass container surface is partially removed, and a non-coating part is created on the glass container surface. Therefore, a non-painted part can be formed very easily after electrostatic coating, and a glass container with high design can be obtained by effectively creating the non-painted part.

  According to the electrostatic coating apparatus for a glass container according to the invention of claim 3, an opening holding member for opening and holding the opening of the glass container having an opening, and an opening of the glass container. An electrode member insertion device for removably inserting an electrode member into and out of the container, a rotating device for rotating the mouth holding member to rotate the glass container, and a height direction of the inverted glass container Since it has a paint spraying device for adhering a powder paint to the surface of a glass container by a reciprocating spray member, electrostatic coating can be performed very easily and easily even with a glass container.

The present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a schematic partial cross-sectional view of an electrostatic coating apparatus for a glass container according to the present invention, FIG. 2 is an enlarged cross-sectional view of the main part thereof, and FIG. The front view of the obtained glass container, FIG. 4 is a schematic diagram which shows the state which produces a non-coating part on the glass container surface.

  An electrostatic coating apparatus 20 for a glass container shown in FIGS. 1 and 2 opens the opening 12 of the glass container 11 having the opening 12 and holds it in an inverted manner, and from the opening 12 of the glass container. The electrode member 45 is removably inserted into the container 13 to rotate the glass container 11, and at the same time, the powder coating 65 is applied by the spraying member 61 that reciprocates in the height direction 11 A of the inverted glass container 11. Is attached to the glass container surface 14 to form the coating film 15. Hereinafter, a preferred embodiment of the method for producing the glass container 10 having the electrostatic coating film will be described specifically together with the electrostatic coating apparatus 20 for the glass container. The illustrated glass container electrostatic coating apparatus 20 includes a mouth holding member 30, an electrode member insertion device 40, a rotation device 50, and a paint spraying device 60.

  As shown in FIGS. 1 and 2, the mouth holding member 30 is configured to open and hold the opening 12 of the glass container 11 having the opening 12 upside down. As the mouth holding member 30, as long as the glass container 11 is held upside down and the mouth holding member 30 can be rotated by the rotating device 50 described later to rotate the glass container 11, any method can be used. A conventionally known fixing jig such as a resin or a metal may be used. In the embodiment, a cylindrical portion 32 is erected at a lower portion of the holding portion 31, and a rotating portion 35 that is engaged with the cylindrical portion 32 is provided. The rotating unit 35 is rotated by a rotating device 50 described later.

  By holding the glass container upside down, it can be held by the mouth holding member 30 stably and easily, rather than being held horizontally. Moreover, since the powder coating material 65 permeates through the opening 12 of the glass container 11 and hardly contaminates the interior 13 of the glass container, it is extremely hygienic. The glass container 11 is not particularly limited, and glass tableware (tableware) such as a cup, tumbler, and mug having an opening, a glass packaging container such as a bottle, or a glass decoration such as a vase. This also applies to products.

  The electrode member insertion device 40 is formed so that the electrode member 45 can be removably inserted into the container 13 from the opening 12 of the glass container 11. As long as the electrode member 45 can be removably inserted into the container 13, the electrode member insertion device may have any configuration. In the embodiment, the electrode member 45 is fixed to the mounting portion 41 connected to the elevating member 42 and is made of glass. The electrode member 45 can be inserted into and removed from the inside of the container 13. As shown in FIG. 2, the electrode member 45 can reciprocate in both directions of the arrow b, and when the electrostatic coating film is formed on the glass container 11, the electrode member 45 is positioned below the mouth holding member 30. It is inserted into the container 13 through the opening 12 of the glass container, and the moving distance of the electrode member 45 is appropriately adjusted according to the form of the glass container. In the embodiment, the electrode member 45 is moved to the vicinity of the bottom 17 of the glass container. After painting, the electrode member 45 in the glass container 13 is extracted from the opening 12.

  The electrode member 45 is made of a metal material such as stainless steel and is a round bar in the embodiment, but may be in the form of a spiral or a protrusion. Further, in order to effectively and efficiently perform electrostatic coating on the surface of the glass container, it is preferable that the distance between the inner surface of the glass container and the electrode member surface is short (see FIG. 2). For example, when the electrode member 45 is a round bar, the diameter is preferably as large as possible. When the opening of the glass container has a diameter of about 20 mm, the diameter of the round bar of the electrode member 45 is about 15 mm. It is desirable to be. In the embodiment, the electrode member 45 is grounded and has a potential of 0. When a negative DC high voltage is applied to a spraying member 61 of the paint spraying device 60 described later, the electrode member 45 becomes a positive electrode, and the paint spraying device 60 and the electrode An electrostatic field is created between the member 45.

  The rotating device 50 rotates the mouth holding member 30 to rotate the glass container 11. In the embodiment, the driving unit 55 rotated by the motor M is pressed against the rotating unit 35 by an internal spring member 51. When the drive unit 55 is rotated, the rotation unit 35 is rotated in a direction opposite to the rotation direction of the drive unit 55 (in the direction of arrow a). As the rotating part 35 is rotated in the direction of arrow a, the holding part 31 erected at one end of the cylindrical part 32 engaged with the rotating part 35 is rotated in the direction of arrow a, and at the same time a glass container 11 is rotated in the direction of arrow a. By rotating the glass container 11, the coating film can be stably and reliably attached to the entire container surface regardless of the form of the container 11.

  The coating material spraying device 60 is configured to attach the powder coating material 65 to the glass container surface 14 by a spraying member 61 that reciprocates in the height direction 11A of the glass container 11 held upside down. The spray member 61 uses a spray gun for electrostatic coating in the embodiment, but may be a bell type used in a so-called electrostatic atomization method. When painting is performed, the glass container 11 that is the object to be coated is rotated in the direction of arrow a, and the paint spraying device 60 is reciprocated in the height direction 11 </ b> A of the glass container 11. Even if it is not provided, a coating film can be reliably formed on the entire surface 14 of the container regardless of the size and shape of the glass container 11.

  In addition, as described above, when a negative high voltage is applied to the paint spraying device 60 by a high voltage generator (not shown) or the like, the powder paint 65 sprayed from the spraying member 61 is negatively charged, so that the positive electrode The powder coating 65 is attached to the glass container surface 14 by an electrostatic field generated by an electrode member 45. The powder coating 65 is not particularly limited, and a known coating can be used. Various pigments, curing agents and additives are mainly composed mainly of polyester resin, epoxy polyester resin, epoxy resin, acrylic resin, fluororesin and the like. Is used.

  Since the powder paint 65 does not use an organic solvent, it is very easy to handle paint that scatters during painting, and it can be recovered and reused. In addition, the powder paint can eliminate the dangers such as toxicity and flammability of the organic solvent when the liquid paint is used, and does not cause a problem of waste liquid treatment. In addition, exhaust gas is hardly generated even during drying and baking after the powder coating is applied, which is preferable in terms of environmental hygiene and extremely safe.

  Next, the manufacturing method of the glass container 10 which has an electrostatic coating film prescribed | regulated as invention of Claim 1 is demonstrated using FIG.1 and FIG.2. The glass container 11 is usually subjected to electrostatic coating after the container surface 14 is cleaned and cleaned. In order to improve the adhesion of the powder coating 65 to the glass container surface 14 and to form the coating film efficiently and effectively, the glass container 11 is preheated at about 100 ° C. in the pre-process of the coating process. Etc. may be performed.

  The glass container 11 is opened upside down by the opening holding member 30 and the electrode material 45 is inserted into the interior 13 of the glass container 11 up to the vicinity of the bottom 17 of the glass container. The powder coating 65 negatively charged from the spray member 61 is sprayed in an electrostatic field created by the electrode material 45 that is the positive electrode, and the powder coating 65 is disposed in the glass container 13 by electrostatic force. By being attracted to the electrode material 45, it is applied to the glass container surface 14.

  At this time, since the glass container 11 is rotated in the direction of arrow a, the powder coating 65 can be efficiently attached to the entire container surface 14. Furthermore, since the spray member 61 reciprocates in the height direction 11 </ b> A of the glass container 11, a desired coating film can be stably formed without being substantially affected by the form of the glass container 11. After painting, the electrode member 45 disposed in the glass container 13 is extracted, and heat treatment is performed to bake and harden the paint adhered to the container surface 14. The baking conditions are adjusted as appropriate. For example, it is preferable that the baking conditions are maintained for about 20 minutes at a temperature of about 180 ° C.

  As shown in FIG. 3, a glass container 10 having an electrostatic coating film obtained by the method of the present invention is a thin, monotonous and planar coating obtained by a conventionally known liquid coating or the like by using a powder coating. Compared to the film, the coating film 15 is thick and has a texture. In addition, although the film thickness of a coating film is suitably adjusted with various conditions, such as a voltage supplied to a powder coating material or a spraying member, and an electric current, it is about 50-100 micrometers. Moreover, it is also possible to bring out the appearance like a pottery like an Example with the powder coating material used. In this case, although it is a glass container, the warmth, texture and texture peculiar to pottery are displayed, so it has a high-class feeling. There is an advantage that it is easy to do. Thus, the glass container 10 having a ceramic texture can be obtained very easily and cost-effectively.

  In addition, the color tone for creating an appearance like pottery is appropriately adjusted by using a powder paint in which pigments such as brown, black, white, yellow, and pearl are blended. At this time, if it is the coating method of the present invention, it is also possible to obtain a coating film having a desired color tone at a time by performing electrostatic coating by previously mixing a plurality of kinds of color powder paints, Since different paints are used, it is not necessary to perform painting in multiple steps, so that the number of work steps can be reduced and manufacturing costs can be reduced.

  FIG. 4 shows another embodiment 19 of a glass container having an electrostatic coating film defined as the invention of claim 2. The glass container 19 having the electrostatic coating film is not coated on the glass container surface 14 by partially removing the coating film 15 on the glass container surface 14 after the powder coating 65 is adhered by the spray member 61. Formed to create portion 16. First, as shown in FIG. 4A, in the glass container 10 having the coating film 15 formed on the entire container surface 14, air G is jetted toward the glass container 11 by a known air spray 71. Thus, the coating film 15 is partially removed, and a glass container 19 is obtained in which the non-coating portion 16 is created on the glass container surface 14 (see FIG. 4B). If the coating film after electrostatic coating is before baking and curing, it is possible to easily produce a non-coating portion using air spray or the like. The method for partially removing the coating film 15 is not particularly limited, and may be removed by a jig such as a resin spatula.

  In the past, non-painted parts were formed mainly by painting with a mask member during painting, but this method emphasizes the boundary between the paint film and non-painted parts, so it is a standard design. In many cases, it was poor in quality and faded. However, as described above, the non-painted portion is formed by air spray or the like after the formation of the paint film by electrostatic coating, so that natural and gradual shades of the paint film can be obtained. The boundary is not emphasized, and a high-quality glass container with a high design effect is obtained.

  As described above, in the method for manufacturing a glass container having an electrostatic coating film according to the present invention, the opening 12 of the glass container 11 having the opening 12 is opened and held inverted, and the glass The electrode member 45 is removably inserted into the container 13 from the opening 12 of the container, and the glass container 11 is rotated, and the glass container 11 held upside down is reciprocated in the height direction 11A. Since the coating film 15 is formed by adhering the powder coating 65 to the glass container surface 14 by the member 61, pretreatment such as energization treatment is performed even for a glass container which is a non-conductive material. It is possible to form an electrostatic coating film very easily and reliably without applying the above. Moreover, it is possible to form a coating film with high design and high-class feeling.

  In addition, the manufacturing method of the glass container which has the electrostatic coating film of this invention, and the electrostatic coating apparatus of a glass container are not limited only to the above-mentioned Example, In the range which does not deviate from the meaning of invention. It is possible to implement by changing a part of the above as appropriate.

It is a general | schematic fragmentary sectional view of the electrostatic coating apparatus of the glass containers of this invention. It is an expanded sectional view of the principal part of FIG. It is a front view of the glass container obtained by the manufacturing method of the glass container which has an electrostatic coating film of this invention. It is a schematic diagram which shows the state which produces a non-coating part on the glass container surface.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Glass container which has electrostatic coating film 11 Glass container 12 Opening part 13 In container 14 Surface 15 Coating film 16 Non-coating part 20 Glass container electrostatic coating apparatus 30 Mouth holding member 40 Electrode member insertion apparatus 45 Electrode Member 50 Rotating device 60 Paint spraying device 61 Spraying member 65 Powder paint

Claims (3)

  The glass container having an opening is opened and held upside down, and an electrode member is inserted into the container from the opening of the glass container so that the electrode member can be freely inserted and removed, and the glass container is rotated and the inverted Production of a glass container having an electrostatic coating film, characterized in that a coating film is formed by adhering a powder coating to a glass container surface by a spraying member that reciprocates in the height direction of the held glass container. Method.   2. The glass-made electrostatic coating film according to claim 1, wherein after the powder coating material is attached by the spray member, the coating film on the glass container surface is partially removed to create a non-coating portion on the glass container surface. Container manufacturing method. A mouth holding member for opening and holding the opening of the glass container having an opening;
An electrode member insertion device for inserting and removing an electrode member into the container from the opening of the glass container;
A rotating device that rotates the glass container by rotating the mouth holding member;
An electrostatic coating apparatus for a glass container, comprising: a paint spraying device that attaches a powder paint to the surface of the glass container by a spraying member that reciprocates in the height direction of the glass container held upside down.

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