JP4404696B2 - Manufacturing method of painted glass container - Google Patents

Description

  The present invention relates to a method for producing a coated glass container, and more specifically, without using a masking tape or the like, after simultaneously forming a painted portion and a non-painted portion, a cured coating film is formed corresponding to the painted portion. The present invention relates to a method for producing a coated glass container, which can efficiently produce a coated glass container having a partially cured coating film.

Conventionally, as a curable coating composition for glass, melamine resin and acrylic resin are frequently used because of excellent strength of the cured coating film and excellent adhesion to the glass surface. After coating the surface of the glass container, it is heated or irradiated with ultraviolet rays to form a cured coating film, improving the decorativeness and aesthetic appearance of the glass container, and further protecting the glass. It was.
And the surface of such a glass container is provided with a non-coating part (surface to be painted), and an adhesive label or the like may be affixed there, but in order to provide the non-coating part, a method using a masking tape is common. Has been done.

Moreover, as shown in FIG. 8, a coating film (not shown) made of ultraviolet curable ink with poor adhesion is formed in advance at a predetermined location, and then thermosetting made of another thermosetting paint from above. A method is also disclosed in which a coating film made of the ultraviolet curable ink is peeled off with an adhesive tape 104 together with the thermosetting coating film 102 after being formed by heating and curing the adhesive coating film 102 (for example, Patent Documents). 1).
However, when such a masking tape or pressure-sensitive adhesive tape is used, there are problems that the manufacturing process increases and the manufacturing cost increases. In addition, when masking tape or adhesive tape is used, a step corresponding to the thickness of the cured coating film is clearly generated at the boundary between the partially formed cured coating film and the non-painted part. Thus, there are problems that the cured coating film is easily peeled off, the end portion of the cured coating film is conspicuous, and that it is difficult to apply the pressure-sensitive adhesive label flat on the non-coating portion.
JP-A-5-345164 (Claims)

Therefore, the inventors of the present invention diligently studied the above-mentioned problems, and by using a predetermined holding step (step 1) and a painting step (step 2), a masking tape or a complicated masking method is used. Without being applied to a plurality of glass containers, a partially cured coating film can be formed at a time by partially coating each of the coated parts and by inclining the coated part. And the present invention has been completed.
That is, an object of the present invention is to form a coated portion and a non-coated portion at the same time by a simple coating method, and to cure the edge of a partially formed cured coating film. It is providing the manufacturing method of the coating glass container which can produce the coating glass container in which a part is not conspicuous efficiently.

According to the present invention, a method for producing a coated glass container by applying a coating solution to a plurality of glass containers substantially simultaneously, which comprises the following steps (1) and (2): A method for manufacturing a container is provided to solve the above-mentioned problems.
(1) A step of holding a plurality of glass containers in a state of being inclined in a range of 10 to 85 ° with respect to the vertical direction (2) From the periphery of the plurality of glass containers The process of simultaneously forming a coated part and a non-coated part by coating a coating solution (including powder coating and vapor deposition coating)

  Moreover, when implementing the manufacturing method of the coated glass container of this invention, it is preferable to hold | maintain the several glass container in the state piled up in a process (1) using a holder.

  Further, in carrying out the method for producing a coated glass container of the present invention, in the step (1), when the side surfaces of the glass container are flat, the side surfaces of the glass containers are brought into contact with each other to form a plurality of glass containers. When the glass container is held in a stacked state and the side surface of the glass container is curved, it is preferable to hold a plurality of glass containers in a stacked state by sandwiching a buffer member suitable for the side surface.

  Further, in carrying out the method for producing a coated glass container of the present invention, in the step (1), a dummy glass container is disposed at the uppermost end portion and the lowermost end portion of the plurality of glass containers or at one of the end portions. In this state, it is preferable to hold a plurality of glass containers in a stacked state.

  In carrying out the method for producing a coated glass container of the present invention, it is preferable to form a cured coating film by heating or ultraviolet irradiation in a state where a plurality of glass containers are stacked in the step (2). .

In addition, in carrying out the method for producing a coated glass container of the present invention, a post-process is provided after the step (2), and a non-coating portion is further subjected to a coating treatment or an adhesive label is applied. Is preferred.
In the post-process, as described later, it is also preferable to provide an inspection process and select only non-defective products that meet a predetermined standard.

According to the method for manufacturing a coated glass container of the present invention, the coating solution is coated in a state where a plurality of glass containers are stacked, including a predetermined holding process (process 1) and a coating process (process 2). Thus, without using a masking tape or the like, a partially cured coating film can be formed at a time by partially coating and simultaneously curing a plurality of glass containers. In addition, when a partially cured coating film is formed, the edges are gradually inclined, and can be made inconspicuous from the outside. There are many cases where it becomes an obstacle.
Moreover, according to the manufacturing method of the coated glass container of this invention, in a process (1), in the state which piled up the several glass container, further incline and hold them in a predetermined direction, and a coating precision improves. In addition, the painting time can be shortened.

  Moreover, according to the manufacturing method of the coated glass container of this invention, while using a predetermined | prescribed holder in process (1), while being able to hold | maintain several glass containers accurately, it is as it is. It is also possible to move. Therefore, the coating accuracy is improved, that is, not only can a cured coating film be formed at a desired location, it is not necessary to handle a plurality of glass containers individually, and the time to move to the next process is remarkably shortened, The glass container can be handled very easily and safely.

  Moreover, according to the manufacturing method of the coated glass container of this invention, in the step (1), even if the side surface of the glass container is a flat surface or a curved surface, By applying the coating liquid substantially simultaneously and curing it, a coated glass container having a partially cured coating film can be obtained quickly and inexpensively.

  Moreover, according to the manufacturing method of the coated glass container of this invention, glass other than a dummy glass container is arrange | positioned in a process (1) by arrange | positioning a dummy glass container in the uppermost end part etc. of several glass containers. A coated glass container with a partially cured coating film can be formed more accurately and inexpensively by simultaneously forming a coated part and a non-coated part on the container and curing it. it can.

  Further, according to the method for producing a coated glass container of the present invention, in step (2), by heating or irradiating with a plurality of glass containers in a stacked state, it can be performed quickly and accurately, partially. A cured coating film can be formed.

  In addition, according to the method for producing a coated glass container of the present invention, by providing a predetermined post-process after the step (2), it is excellent in decoration and information, and is cured with a flat and uniform thickness. A painted glass container provided with a coating film can be formed.

[First embodiment]
As illustrated in FIG. 1 and the like, the first embodiment is a method for manufacturing a coated glass container 30 by simultaneously applying a coating liquid 16b to a plurality of glass containers 10a to 10g. It is a manufacturing method of the paint glass container containing 1) and (2).
(1) A step of holding a plurality of glass containers 10a to 10g in a stacked state and inclining in a range of 10 to 85 ° with respect to the vertical direction (2) a plurality of glass containers A step of simultaneously forming a painted portion and a non-painted portion by coating the coating liquid 16b from around 10a to 10g, that is, as illustrated in FIGS. 2 (a) to (c) In the manufacturing method in which the corresponding partially cured coating film 13 and the exposed surface portion 13 ′ of the glass container corresponding to the non-painted part are respectively formed, and a painted glass container 30 as shown in FIG. 3 is efficiently obtained. is there.
In addition, the manufacturing method of the coating glass container 30 is demonstrated concretely suitably with reference to the process flow of the manufacturing method of the glass container shown in FIG.

1. Glass container (1) form The shape of the glass containers 10, 10 a to 10 g illustrated in FIGS. 1, 2, 3, 5, and 6 is not particularly limited, and examples thereof include cosmetic bottles and medicinal bottles. Corresponding to the use in glass containers, bottleneck type glass bottles, rectangular glass bottles, cylindrical glass bottles, irregular glass bottles, rectangular glass boxes, cylindrical glass boxes, irregular glass boxes, etc. Is preferred.
Moreover, regarding the shape of the glass container, it is also preferable to provide a thick portion along the outer peripheral portion, or to provide a chamfered portion at a part of the outer peripheral portion.
The reason for this is that if such a glass container, after partially forming the cured coating film, when the glass container is viewed from the front, the light is condensed at the thick part or chamfered part of the outer periphery, This is because a clearer and more complex color can be observed.
Furthermore, as shown in FIG. 7, the glass is substantially cylindrical or polygonal, and has a side surface that is recessed toward the inside of the glass container, and a side surface that conforms in shape to the recessed side surface. It is also preferable to use containers 10h to 10k.
In addition, it does not restrict | limit especially about the kind of glass which comprises such a glass container, Soda lime glass, borosilicate glass, lead glass, phosphate glass, aluminosilicate glass etc. are mentioned.

(2) Colorability As the glass container to be used, colorless transparent glass can be used, but it is also preferable to use colored transparent glass or colored translucent glass.
The reason for this is that by using colored transparent glass or colored translucent glass, the relationship between the cured coating film partially provided on the outside and the colorability in the glass container without excessively reducing the identification of the contents. This is because complicated colors such as rainbow colors, iridescent colors, and scale patterns can be recognized.

(3) Underlayer Also, as shown in FIGS. 3A to 3B, it is preferable that the underlayer (primer layer) 11, 11 ′ is provided on the entire surface or a part of the surface of the glass container 10. More specifically, thermosetting containing polysiloxane resin, melamine resin, phenol resin, urea resin, guanamine resin, epoxy resin, polyurethane resin, polyester resin, acrylic resin, and derivatives thereof as the constituent material of the underlayer It is preferable to use a curable composition or an ultraviolet curable composition.

In particular, by providing a polysiloxane-based underlayer, the hardness of the cured coating can be easily adjusted to a value within the desired range, effectively preventing separation between the glass container and the cured coating. can do.
Further, as a constituent material of the underlayer, a polyol formed by reacting a melamine resin or the like with a polyol compound such as a hydroxyl group-containing acrylic resin, a hydroxyl group-containing epoxy resin, a hydroxyl group-containing polyester resin, or a hydroxyl group-containing urethane resin. It is also preferable to use a modified formaldehyde resin.
The reason for this is that by using such a polyol-modified formaldehyde resin, the adhesion to glass can be improved, and the smoothness and thin film properties of the cured coating film can be further improved.

Furthermore, it is preferable to set the thickness of the underlayer to a value within the range of 0.1 to 10 μm.
The reason for this is that when the thickness of the underlying layer is less than 0.1 μm, the strength is insufficient, and it may be difficult to peel off from the surface of the glass container or to form it uniformly. Because there is. On the other hand, if the thickness of the underlayer exceeds 10 μm, the cured coating film formed thereon may be easily peeled off.
Therefore, the thickness of the underlayer is more preferably set to a value within the range of 0.5 to 8 μm, and further preferably set to a value within the range of 0.8 to 5 μm.

2. Glass Container Holding Step (1) Holder According to the method for manufacturing a coated glass container of the present invention, as shown in FIG. 4, after a glass container is prepared in STEP 1, STEP 2 corresponding to step 1 (the same applies hereinafter). )), A plurality of glass containers are held in a stacked state. And the holding | maintenance method in particular is not restrict | limited, For example, it is preferable to hold | maintain the several glass container 10, 10a-10g in the state piled up.
This is because a part of the glass container can be used as a masking member by applying the coating liquid substantially simultaneously with the plurality of glass containers stacked in this manner. Therefore, the painted portion and the non-painted portion can be simultaneously formed by a simple coating method without using a masking tape or the like. In the case of the plurality of glass containers 10a to 10g shown in FIG. 1, for example, the coating surface is not coated on the contact surfaces 10a 'and the contact surfaces 10b' of the plurality of glass containers. In addition to being formed, a painted portion is formed at other locations.
Therefore, it is possible to obtain a coated glass container provided with a partial coating film at a time by curing the coating liquid in the painted part as it is in a state where the painted part and the non-painted part are formed on a plurality of glass containers. it can.
Also, since the coating liquid has a leveling characteristic, the edge of the cured coating film obtained at the coating part is gradually thinner and inclined, unlike the case of using a masking tape or the like. There is a feature.
Therefore, according to the method for producing a coated glass container of the present invention, the end of the cured coating film can be made inconspicuous, and not only the decorative property of the coated glass container is improved but also the non-painted part is uniform. It is also easy to apply a coating process or attach an adhesive label to a proper thickness.

Further, as shown in FIG. 4, in STEP 2 corresponding to step 1, for example, as shown in FIG. 1, FIG. 5, FIG. 6 and FIG. It is preferable to use a simple holder 12.
The reason for this is that by using the holder 12, the plurality of glass containers 10a to 10g can be accurately stacked and held, while the handle portion 12c is provided to stack the plurality of glass containers. This is because it is possible to move as it is.
Therefore, not only the coating accuracy is improved, but there is no need to handle a plurality of glass containers individually, the time for moving to the next process is remarkably shortened, and the handling of the glass containers is extremely easy and safe.
1, 5, and 6 is a jig that holds a plurality of glass containers 10 a to 10 g in a vertical direction with high accuracy, and includes, for example, predetermined heat resistance and mechanical properties. It is preferable that it is made of iron or aluminum because it has the desired characteristics.
On the other hand, the holder 12 shown in FIG. 7 is a jig that holds a plurality of glass containers 10a to 10g in a horizontal direction with high accuracy, and is made of polycarbonate resin or polyether in order to reduce weight and improve moldability. It is preferably made of a heat resistant resin such as an ether ketone resin, a polyphenylene sulfide resin, a silicone resin, or a fluorine resin. More specifically, the holder 12 shown in FIG. 7 has a substantially cylindrical or polygonal column shape as a glass container, and has a side surface recessed toward the inside of the glass container and a shape on the recessed side surface. This is a suitable holding tool when the glass containers 10h to 10k having side surfaces that coincide with each other are arranged side by side.

(2) Inclination holding In STEP 2 shown in FIG. 4, as shown in FIG. 1, holding a plurality of glass containers 10 a to 10 g is inclined at a predetermined angle (α) with respect to the vertical direction. Features.
This is because, in such a state, the coating solution 16a is coated on the plurality of glass containers 10a to 10g, so that it is not always necessary to perform the coating process from the entire peripheral direction of each glass container. This is because the glass containers 10a to 10g can be coated simultaneously and uniformly from a predetermined direction.
Therefore, not only the coating processing (spraying) apparatus can be simplified, but also the coating accuracy can be improved and the coating time can be shortened.
In addition, although the inclination angle ((alpha)) of a several glass container can be easily adjusted with the inclination angle of a holder, it is set as the value within the range of 10-85 degrees with respect to a perpendicular direction. cage, more preferably a value within the range of 30 to 70 °, still more preferably a value within the range of 45 to 60 °.

(3) Contact Method In STEP 2 shown in FIG. 4, as shown in FIG. 5, when the side surface of the glass container 10 is a flat surface, the side surfaces of the glass container are brought into contact with each other to form a plurality of glass containers. It is preferable to hold in an overlapped state. Furthermore, as shown in FIG. 6, when the side surface of the glass container 10 is a curved surface, it is preferable to hold | maintain the several glass container in the state which pinched | interposed the buffer member 20 which fits the said side surface.
This is because the coating solution can be applied substantially simultaneously with a plurality of glass containers stacked, regardless of whether the side surface of the glass container is flat or curved. Therefore, by adopting such a contact method, it is possible to obtain a coated glass container that is partially coated quickly and inexpensively.

(4) Dummy glass container Further, in STEP 2 shown in FIG. 4, as shown in FIG. 1, the dummy glass container 10a, It is preferable to hold the plurality of glass containers 10b to 10f in a state where 10g is placed.
The reason for this is that by placing a dummy glass container at the uppermost end of a plurality of glass containers, etc., a masking effect can be exerted on other glass containers. This is because can be formed with high accuracy.
The dummy glass container can be the same as the desired glass container to be partially coated, or it is also preferable to use a glass plate or a plastic plate as long as the masking effect can be exhibited.

(5) Others Although not shown, between the STEP 1 and STEP 2 shown in FIG. 4, in order to improve the adhesion between the glass container and the cured coating film to be described later, before the coating process, It is preferable to perform flame treatment (flame treatment and silicic acid flame treatment) on the surface.
That is, holding a plurality of glass containers in a stacked state, using silicon dioxide flame or the like, simultaneously forming a partial thin film of silicon dioxide (silica) on each glass surface, improving the wettability of the surface, Or it is preferable to remove the organic substance adhering to the glass surface.
More specifically, after holding a plurality of glass containers stacked, for example, a silicic acid flame (flame temperature: 800 to 1500 ° C.) using a silicon compound or propane gas as a combustion gas is 0.5 to It is preferable to spray for 30 seconds and to perform the frame treatment on the surface of the glass container.
In carrying out the flame treatment, the glass surface temperature is preferably set to a value in the range of 50 to 200 ° C, more preferably set to a value in the range of 60 to 180 ° C, and 70 to 150 ° C. It is more preferable to set the value within the range.

3. Glass container coating step (1) Coating method As shown in FIG. 4, in STEP 3 (corresponding to step 2 and the same applies hereinafter), a coating step is provided, from a thermosetting composition or an ultraviolet curable composition. It is preferable to simultaneously apply the coating solution to be applied to a plurality of glass containers.
Here, the application method of the thermosetting composition or the like is not particularly limited, and examples thereof include an electrostatic coating method, an electrodeposition coating method, a roll coater method, an air spray method, an airless spray method, and a curtain flow coater method. be able to.
Of these coating methods, the film can be made thinner and can be applied even to the curved surface of the glass, while the structure of the coating device is simple. More preferably, it is used.

(2) Coating liquid In addition, the coating liquid may be liquid or solid as a property, and further may be a vapor deposition material or a sputtering material, more specifically, a thermosetting composition. And a UV curable composition, and as a main ingredient, it may contain polysiloxane resin, melamine resin, phenol resin, urea resin, guanamine resin, epoxy resin, polyurethane resin, polyester resin, acrylic resin, and derivatives thereof preferable.
In particular, by including a polysiloxane-based resin as the main agent, the hardness of the cured coating film can be easily adjusted to a value within a desired range, and the water resistance and heat resistance can be improved, which is a preferable resin. .
In addition, it contains a polyol-modified formaldehyde resin constituted by reacting a melamine resin or the like with a polyol compound, for example, a hydroxyl group-containing acrylic resin, a hydroxyl group-containing epoxy resin, a hydroxyl group-containing polyester resin, a hydroxyl group-containing urethane resin, or the like. Thereby, while improving the adhesive force with respect to a glass container, the smoothness and thin film property of a cured coating film can be improved more. More specifically, it is preferable to blend 50 to 300 parts by weight of the acrylic polyol compound and 5 to 100 parts by weight of the lactone polyol compound with respect to 100 parts by weight of the melamine resin.

Further, when a polysiloxane resin or a melamine resin is used, it is preferable to add a curing agent (including a curing catalyst, the same applies hereinafter).
Such curing agents include platinum, dibutyltin, dimethyl oxalate, diethyl oxalate, maleic anhydride, phthalic anhydride, monochloroacetic acid sodium salt, monochloroacetic acid potassium salt, α, α-dichlorohydrin, Examples thereof include ethylamine hydrochloride, triethanolamine hydrochloride, ammonium chloride, ammonium sulfate, ammonium chloride salt, ammonium sulfate salt, urea derivatives, imide ammonium diammonium sulfonate, and a combination of two or more.
In addition, it is preferable to make the addition amount of this hardening | curing agent into the value within the range of 0.1-30 weight part with respect to 100 weight part of main agents.
The reason for this is that when the addition amount of the curing agent becomes a value of less than 0.1 parts by weight, the addition effect may not be manifested. On the other hand, when the addition amount of the curing agent exceeds 30 parts by weight, This is because it may be difficult to control the reactivity of the main agent.

Moreover, it is preferable to add various additives in the coating liquid which comprises a cured coating film. In particular, the silane coupling agent is preferably added in the range of 0.5 to 50 parts by weight with respect to 100 parts by weight of the main agent.
Further, the kind of the silane coupling agent is not particularly limited, and examples thereof include γ-ureidopropyltriethoxysilane, γ-ureidopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, and γ-amino. It is preferable to use one kind alone or a combination of two or more kinds such as propyltrimethoxysilane, γ- (2-aminoethyl) aminopropyltrimethoxysilane, γ- (2-aminoethyl) aminopropylmethyldimethoxysilane.
In particular, when γ-ureidopropyltriethoxysilane is used, it is preferably added in the range of 10 to 40 parts by weight with respect to 100 parts by weight of the melamine resin.

4). Step of curing coating film in glass container (1) Curing condition Next, as shown in FIG. 4, by heating or irradiating with ultraviolet rays or the like in a state where a plurality of partially coated glass containers are stacked in STEP 4, It is preferable to cure the coating film made of the applied thermosetting composition or ultraviolet curable composition.
That is, for example, it is preferable to cure the formed coating film while using a holder 12 as shown in FIGS. 1, 5, 6 and 7 while a plurality of glass containers are stacked. . The reason for this is that, by curing in this way, a plurality of glass containers can be handled together, and it is possible to effectively prevent the coating film from flowing excessively and curing there other than a predetermined location. Because.
Moreover, although the curing conditions (baking conditions) in the curing step can be appropriately changed according to the reactivity of the thermosetting composition to be used, it is usually performed under conditions of 140 to 250 ° C. for 1 to 120 minutes. It is more preferable to carry out under conditions of 150 ° C. to 230 ° C. and 5 minutes to 60 minutes, and it is further preferred to carry out under conditions of 160 ° C. to 220 ° C. and 10 minutes to 30 minutes.
When the thermosetting composition is a room temperature dry paint, it is preferably dried at room temperature for 1 day to 1 week, and preferably 2 to 4 days.
Furthermore, when an ultraviolet curable composition is used, it is preferable to form a cured coating film by setting the exposure amount of ultraviolet rays to a value within the range of, for example, 50 to 1,000 mJ / cm ² .

(2) Cured coating film Moreover, it is preferable to make the thickness of the cured coating film to form into the value within the range of 1-100 micrometers.
The reason for this is that when the thickness of the cured coating film is less than 1 μm, the strength is insufficient, and it may be difficult to peel off from the surface of the glass container or to form it uniformly. Because. On the other hand, when the thickness of the cured coating film exceeds 100 μm, the multilayer film thereon may be easily peeled off.
Accordingly, the thickness of the cured coating film is more preferably set to a value within the range of 5 to 50 μm, and further preferably set to a value within the range of 10 to 30 μm.

Moreover, it is preferable to make the pencil hardness of the cured coating film measured based on JIS K5400 into the value within the range of 1-5H.
This is because when the pencil hardness of the cured coating film is less than 1H, the wear resistance may be significantly reduced or the cured coating film may be easily peeled off. On the other hand, when the pencil hardness of the cured coating film exceeds 5H, the cured coating film itself may be easily peeled off at the corners of the glass container.
Therefore, it is more preferable to set the pencil hardness of the cured coating film to a value within the range of 2 to 4H.

Moreover, it is preferable to provide the inclination part which the edge part became thin gradually about the edge part of a cured coating film.
Conversely, when partially forming a cured film using masking tape or adhesive tape, there is a step corresponding to the thickness of the cured coating film at the boundary between the cured coating film and the non-coated part. This is because it occurs clearly. That is, due to such a step, the cured coating film is easily peeled off, the end of the cured coating film is noticeable, and furthermore, it is difficult to apply a pressure-sensitive adhesive label flat on the non-coating portion. This is because problems are likely to occur.

5). Post-process In addition, according to the method for manufacturing a coated glass container of the present invention, as shown in FIG. 4, it is preferable to provide an inspection process as a post-process after STEP 4, or in the post-process although not shown. Further, it is preferable that the non-painted portion is further subjected to a color painting treatment or a clear painting treatment, or an adhesive label or the like is attached.
The reason for this is that by providing such a post-process, defective products can be efficiently eliminated, and a cured coating film having a flat and uniform thickness is excellent in the decorativeness and information property of the coated glass container. This is because the provided coated glass container can be formed.

  The contents of the present invention will be described in more detail with reference to the following examples. However, the technical scope of the present invention is not limited to the description of only these examples, and can be appropriately changed within the scope of the object of the present invention.

[Example 1]
1. Manufacture of coated glass container (1) Preparation of glass coating composition In a mixing container equipped with a stirrer, the following compounding materials were charged and stirred at room temperature for 30 minutes (rotation speed: 1000 rpm), with a viscosity of 40 mPa · s ( 25 ° C.) glass coating composition was obtained.
Melamine resin 100 parts by weight Acrylic polyol compound 180 parts by weight (hydroxyl number 300 mg KOH / g, number average molecular weight 3,000)
Lactone polyol compound 30 parts by weight (hydroxyl number 200 mg KOH / g, number average molecular weight 1,000)
Ureidopropyltriethoxysilane 25 parts by weight Phosphate-based curing catalyst 5 parts by weight Red pigment 5 parts by weight Xylene 300 parts by weight Butyl acetate 150 parts by weight Isopropyl alcohol 90 parts by weight

(2) Application and curing of glass coating composition Next, seven glass containers having a flat side surface (height 8 cm, cross section length 4 cm, cross section width 8 cm, bottle neck portion height 1 cm, bottle neck portion diameter 2 cm) are prepared. Then, they are arranged using an iron holder as shown in FIG. 1 and tilted so that the tilt angle is 30 ° with respect to the horizontal plane, that is, the tilt angle is 60 ° with respect to the vertical direction. . Note that the two glass containers respectively disposed above and below the holder are dummy glass containers.
Next, the glass coating composition described above is air-sprayed from the periphery of the glass container for a predetermined time, and then baked under the conditions of 180 ° C. × 20 minutes. The thickness is 20 μm, based on JIS K 5600. A red cured coating film having a pencil hardness of 3H was partially formed.

2. Evaluation of Painted Glass Container The obtained coated glass container (excluding the dummy glass container) was evaluated for applicability, adhesion, and appearance as follows. The obtained results are shown in Table 1.

(1) Applicability The applicability was evaluated according to the following criteria from the time required to complete the coating including the protective layer and the shift in the formation position of the coating film obtained thereby.
A: Coating can be completed within 15 seconds, and there is almost no shift in the coating film formation position.
○: The coating can be completed within 30 seconds, and there is almost no deviation in the formation position of the coating film.
Δ: Coating can be completed within 60 seconds, and there is little deviation in the formation position of the coating film.
X: It takes more than 60 seconds to complete the coating, and there is a large shift in the formation position of the coating film.

(2) Adhesiveness The grid glass tape method based on JIS K 5600 was carried out for the method of manufacturing the obtained glass container, and the adhesiveness was evaluated in accordance with the following criteria from the number of peeling per 100 grids. Carried out.
A: The number of peeling is 0 / 100th grid or less.
○: The number of peeling is 3 or less / 100th grid.
Δ: The number of peeling is 10 or less / 100th grid.
X: The number of peeling is 10 or more / 100th grid.

(3) Appearance Appearance was evaluated according to the following criteria from the recognition of the end position of the obtained cured coating film.
(Double-circle): The edge part position of a cured coating film cannot be discriminated at all.
○: The end position of the cured coating film is hardly discernable.
(Triangle | delta): The edge part position of a cured coating film is a little conspicuous.
X: The edge part position of a cured coating film is conspicuous conspicuously.

[Example 2]
In Example 2, a coated glass container was prepared and evaluated in the same manner as in Example 1 except that a blue cured coating film was partially formed using a blue pigment instead of the red pigment in Example 1. .

[Example 3]
In Example 3, a coated glass container was prepared and evaluated in the same manner as in Example 1 except that a blue cured coating film was partially formed using a yellow pigment instead of the red pigment in Example 1. .

[Example 4]
In Example 4, the entire glass container including the non-formed part of the glass coating composition formed simultaneously in Example 1 was air-sprayed for 10 seconds, and then 180 °. The coated glass container was evaluated in the same manner as in Example 1 except that it was baked under the conditions of 20 ° C. × 20 minutes and simultaneously cured together with the glass coating composition.
In addition, the cured coating film which consists of a thermosetting transparent material formed the gentle slope also in the edge part of a partial red cured coating film, and it was confirmed that flatness is high.

[Examples 5 to 7, Reference Example 8 ]
In Examples 5 to 7 and Reference Example 8 , using the holder, the inclination angles in a state where a plurality of glass containers are stacked are 65 °, 70 °, 80 °, and none (90 °), respectively. A coated glass container was prepared and evaluated in the same manner as in Example 1 except that it was changed.

[Comparative Examples 1-4]
In Comparative Example 1, after a masking tape was applied to the large side surfaces (two places) of the glass container used in Example 1, the glass coating composition was air sprayed for 10 seconds. Subsequently, it was moved to a heating furnace and thermally cured in the same manner as in Example 1 to partially form a red cured coating film. Then, after the temperature of the coated glass container fell to room temperature, the masking tape was peeled off to create a painted glass container.
Moreover, in Comparative Examples 2-3, a cured coating film was partially formed using a masking tape as in Comparative Example 1, except that the glass paint composition used in Examples 2-3 was used. A painted glass container was created.
Furthermore, in Comparative Example 4, after partially applying the glass coating composition using a masking tape as in Comparative Example 1, the thermosetting transparent material was further applied in the same manner as in Example 4. A painted glass container was created.
Each of the obtained coated glass containers was evaluated in the same manner as in Example 1.

According to the method for manufacturing a glass container of the present invention, the coating solution is substantially simultaneously applied in a state where a plurality of glass containers are stacked, including a predetermined holding process (process 1) and a coating process (process 2). By doing so, a coated glass container partially coated at the same time can be efficiently obtained without using a masking tape or the like. Therefore, while providing a partially cured coating film, it became easy to apply a clear coating or a label or the like flatly on an area where the cured coating film does not exist.
Further, according to the method for manufacturing a glass container of the present invention, when a cured coating film is formed, the end portion thereof is gradually thinned to form an inclined portion and can be made inconspicuous. It was. Therefore, the glass container can be suitably used for applications such as cosmetic glass containers, packaging glass containers, and decorative glass containers that require high decorative properties.
However, in the method for producing a glass container of the present invention, it is basically unnecessary to use a masking tape or the like. A formation part can also be provided.

It is a figure provided in order to demonstrate the coating method in the manufacturing method of the coating glass container of this invention. (A)-(c) is a figure provided in order to demonstrate the coating glass container obtained by this invention. (A)-(b) is a figure provided in order to demonstrate the surface state (underlayer) of the glass container used for this invention. It is a figure provided in order to demonstrate the process flow of the manufacturing method of a glass container. (A)-(c) is a figure provided in order to demonstrate the coating method using the holder of this invention. (A)-(b) is a figure provided in order to demonstrate another application | coating method using the holder of this invention. It is a figure provided in order to demonstrate the coating method using another holder of this invention. It is a figure provided in order to demonstrate the conventional coating method.

Explanation of symbols

10, 10a-10a: Glass container 11, 11 ′: Primer layer (underlayer)
12: Holder 13: Cured coating film 13 ': Glass container surface 30 corresponding to non-painted part 30: Painted glass container

Claims (6)

A method for producing a coated glass container by substantially simultaneously applying a coating solution to a plurality of glass containers, comprising the following steps (1) and (2): Method.
(1) The step of holding the plurality of glass containers in a stacked state and inclining in the range of 10 to 85 ° with respect to the vertical direction (2) Around the plurality of glass containers The process of simultaneously forming the painted part and the non-painted part by coating the coating liquid from   The method for producing a coated glass container according to claim 1, wherein in the step (1), the plurality of glass containers are held in a stacked state using a holder.   In the step (1), when the side surfaces of the glass container are flat, the side surfaces of the glass containers are brought into contact with each other, and the plurality of glass containers are held in a stacked state. The method for producing a coated glass container according to claim 1 or 2, wherein in the case of a curved surface, a buffer member suitable for the side surface is sandwiched and the plurality of glass containers are held in a stacked state. .   In the step (1), a state in which the plurality of glass containers are stacked in a state where a dummy glass container is disposed at the uppermost end and the lowermost end of the plurality of glass containers, or any one of the ends. The method for producing a coated glass container according to any one of claims 1 to 3, wherein:   5. In the step (2), a cured coating film is formed by heating or ultraviolet irradiation in a state where a plurality of glass containers are stacked, corresponding to the coating part. The manufacturing method of the coating glass container as described in any one of these.   A post-process is provided after the step (2), and the non-painted portion is further subjected to a coating treatment or an adhesive label is attached. The manufacturing method of the coated glass container of description.

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