JP3555826B2 - Bottle coating chamber - Google Patents

Description

上記の表１において、「膜厚むら」は局部的に１３０ｎｍを超えた箇所が発生したものを良否の判定基準とした。また「耐アルカリ性」はコーティングの剥離が全体の１／５０以下であることを良否の判定基準とした。「コンベア上での安定性」は循環風によって動かないことを判定基準とした。
【００５８】
この結果からも分かるように、吹出口の面積の総和が３０００〜３００００ｍｍ^２の範囲とし、風量を５〜２０ｍ^３／ｍｉｎの範囲内であって、実施例１ではＡ、同２ではＢ、同３ではＣ、同４ではＤの組合せを選択することが膜厚むらを生じず、耐アルカリ性に富み、かつ壜の安定性を得るうえで好ましい。
【００５９】
【発明の効果】
本発明は以上説明したように、被処理物である壜近傍に設けられた吹出室および吸込室と、吹出室および吸込室との間に配設されたブロアとを備え、該吹出室には吹出口を有し、該吸込室には吸込口を有して、前記吹出室の吹出口は壜の重心より下方に配設されているから、壜のコーティングに際し安定して処理を行うことが可能となる。
【００６０】
また請求項２によれば、吹出口の面積の総和を３０００〜３００００ｍｍ^２ とし、循環ブロワの吹出口からの風量の範囲を５ｍ^３ ／ｍｉｎ〜２０^３ ／ｍｉｎとし、これらの範囲内で最適値を組合せることにより良好な被膜の形成ができる。
【図面の簡単な説明】
【図１】本発明にかかる壜のコーティングチャンバの１実施形態を示し、（Ａ）は外観斜視図、（Ｂ）は（Ａ）の吹出口および吸込口部分の斜視図、（Ｃ）は循環ブロワの流れを示す断面図。
【図２】本発明にかかる壜のコーティングチャンバの他の実施形態を示し、（Ａ）は外観斜視図、（Ｂ）は（Ａ）の吹出口および吸込口部分の斜視図、（Ｃ）は循環ブロワの流れを示す断面図。
【図３】従来の壜のコーティングチャンバを示し（Ａ）は外観斜視図、（Ｂ）は循環ブロワの流れを示す断面図。
【符号の説明】
２ 壜
１１ コーティングチャンバ
１１ａ チャンバブロック
１１ｂ 吹出室
１１ｃ 吹込室
１２ 循環ブロワ
１４ 吹出口
１５ 吸込口[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a chamber for forming a coating film on the outer surface of a bottle, and more particularly, to a bottle coating chamber for forming a coating film for a returnable bottle in which the bottle is subjected to repeated hot alkali cleaning.
[0002]
[Prior art]
A glass bottle blow-molded into a bottle shape having a mouth, a shoulder, a body, and a bottom in a bottle making machine still maintains a surface temperature of 500 ° C. or more on a conveyor conveyed to an annealing furnace.
[0003]
The coating chamber shown in FIG. 3 is installed on a conveyor that transports bottles to the annealing furnace.
[0004]
As shown in the perspective view of FIG. 3A, the inside of the coating chamber 7 is composed of a circulation blower 7a, a port purge blower 7b, a reaction gas supply port 7c, an exhaust blower 7d, and the like.
[0005]
As shown in FIG. 3 (B), the bottle 2 is supplied with air through the mouth purge blower 7b at the tip of the bottle 2 and supplied with the reaction gas to the body (body) of the bottle 2 to circulate. Then, a substance capable of forming an oxide by causing a hydrolysis reaction and an oxidation reaction in this temperature range, such as SnCl ₄ , an organotin compound, TiCl ₄ , and titanium alkoxide, is filled in a gaseous state in the chamber, and is filled with SnO 4. ₂ , an oxide film such as TiO ₂ can be formed. By forming an oxide film in this manner, it is possible to prevent the generation of microcracks, which is the main cause of the decrease in the strength of glass, and therefore, it is possible to reduce the thickness of the glass required to guarantee the strength.
[0006]
This technology, called hot-end coating, has evolved and contributed to reducing the weight of bottles.
[0007]
When the film thus formed is as thin as about 10 nm, its existence is scarcely recognized. However, when the thickness is increased, the film becomes conspicuous because it has a light reflectance and a color tone corresponding to the thickness.
[0008]
For this reason, it becomes difficult to see if the thickness of the film varies depending on the location, but it becomes more difficult to form a film on the entire bottle without local unevenness as the film thickness increases. For this reason, products on the market have been coated with only a thin film of about 10 nm.
[0009]
There are two types of bottles: one-way bottles that are not supposed to be reused after filling, and returnable bottles that are collected and refilled, such as beer bottles and one-size bottles. Is performed.
[0010]
When a film is formed by a conventional hot-end coating technique, the coating is peeled off by washing with hot alkali, and thus this technique was not used for a returnable bottle.
[0011]
However, according to JP-A-3-13147, it is possible to form a film that can withstand hot alkali cleaning by keeping the outer surface temperature of the bottle at 550 ° C. or higher when forming the film and controlling the film thickness from 40 nm to 100 nm. It has been disclosed.
[0012]
On the other hand, in IS bottle machines that are widely used, the time until the molded bottle reaches the coating chamber, that is, the time to be released to the atmosphere and cooled, differs depending on the mold used to form the bottle.
[0013]
For this reason, the surface temperature of the bottle at the time of forming a film differs for each mold, and it is difficult to sufficiently control the temperature.
[0014]
In this regard, Japanese Patent Application Laid-Open No. H6-157062 discloses a transfer method in which the time from discharging to a conveyor after molding to entering a lehr is kept constant regardless of the mold.
[0015]
[Problems to be solved by the invention]
In order to satisfy the conditions disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 3-13147 and maintain the appearance, a film having a thickness of four times or more the thickness of the hot-end coating conventionally used must be formed without local unevenness. Need to be formed.
[0016]
In particular, when a thick portion of the coating comes out along the vertical direction of the bottle, the appearance is significantly deteriorated.
[0017]
Further, from the point of function, it is necessary to secure a sufficient film thickness at a place where the impact is likely to occur on the filling line or the like, that is, at a point (contact point) having a maximum diameter in the body.
[0018]
The coating is formed on the entire outer surface, but a boundary is formed between the portion where the coating is formed and the portion where the coating is not formed near the mouth of the bottle.
[0019]
In order to make this part inconspicuous, it is desirable that the film thickness gradually decreases from the lower part to the upper part of the bottle.
[0020]
On the other hand, when the coating is performed in a usual one-way coating chamber even when the conditions disclosed in JP-A-3-13147 are satisfied, a phenomenon occurs in which the coating is partially peeled off by hot alkali.
[0021]
As a coating chamber, various methods have been proposed as disclosed in Japanese Patent Publication No. 2-61426.
[0022]
A typical chamber is mounted on a conveyor in a tunnel shape, and has a plurality of outlets for blowing a reactive gas on both sides of a side wall thereof, and an inlet for collecting unreacted gas, by-product gas, and the like.
[0023]
The outlet and the inlet are connected via a blower outside the chamber to form a circulation loop and reuse the unreacted gas and exhaust heat. In this case, the reactive gas supply port is located near the outlet. is there.
[0024]
In general, the outlet and the inlet are arranged so as to face each other with a conveyor interposed therebetween. When a circulation loop is used, the inlet is larger than the outlet to effectively collect unreacted gas.
[0025]
Exhaust ports are provided at both ends of the chamber in addition to the suction ports, so that unreacted gas and generated gas do not leak outside the chamber.
[0026]
A burner treatment may be performed at the entrance of the annealing furnace to obtain smoothness of the mouth. At this time, if a film adheres to the mouth, it becomes white, which is not preferable in aesthetic appearance.
[0027]
Also, if the bottle has a screw mouth, there is a functional problem that the opening torque of the cap becomes excessively large due to the attached oxide, so a mechanism that purges with air to prevent the film from sticking to the mouth. With.
[0028]
In a normal chamber, for example, in Japanese Patent Publication No. 2-61426, the height of the outlet is set in accordance with the range so that a portion below the mouth can be uniformly coated. In order to achieve a coating that can withstand hot alkali washing at all portions of the outer surface of the bottle, it is necessary to form a coating having a sufficient thickness on the mouth.
[0029]
Then, the mouth purging mechanism of the chamber having the above characteristics is removed, the transfer method described in JP-A-6-157062 is used, and the surface temperature is further satisfied with a burner to satisfy the conditions disclosed in JP-A-3-13147. When the temperature-controlled bottle was coated with an air outlet having a height of 2/3 of the entire length of the container, a thick film adhered to the upper portion of the bottle. Although this sample satisfies the conditions disclosed in JP-A-3-13147 in the entire outer surface, a portion where the coating was partially peeled off by hot alkali occurred. However, the coating at the place where the reaction gas was thought to have vigorously bumped against the outlet was not peeled off.
[0030]
As a result of intensive studies based on this fact, the following was found.
[0031]
In order to form a film that can withstand hot alkali cleaning, it is necessary to cause the reaction gas to come into contact with the outer surface of the glass container at a flow rate higher than a certain value in addition to the conditions disclosed in JP-A-3-13147.
[0032]
The flow rate required for this depends on the type of reaction gas, but in the case of SnCl ₄ , the flow rate at the outlet is about 30 m / sec or more.
[0033]
When the area of the outlet is reduced in order to obtain the above flow rate, the concentration of the reaction gas locally increases near the outlet, so that the coating on the portion directly facing the outlet when the bottle passes through the chamber is thick. Become.
[0034]
In particular, when the area of the outlet is elongated and reduced, the portion of the upper part of the bottle directly facing the outlet tends to be thicker due to the effect of an updraft described later.
[0035]
In addition, when the air flow rate of the circulation blower is increased in order to obtain the above flow rate, it is necessary to increase the capacity of the circulation blower. Such an excessive increase in air volume requires a large-sized circulation blower, which is not preferable in terms of equipment.
[0036]
Further, if the air volume is excessively increased, the bottle may fall over in the chamber. Especially when the height of the outlet is higher than the center of gravity of the bottle, the strong wind hits the upper portion of the bottle, so that the bottle easily falls over. There is a disadvantage that.
[0037]
[Means for Solving the Problems]
SUMMARY OF THE INVENTION The present invention provides a bottle coating chamber capable of forming a coating that does not cause thermal alkali peeling over the entire outer surface of the bottle and that has no local unevenness to maintain aesthetic appearance. SUMMARY OF THE INVENTION As a means for solving the problem, the invention according to claim 1 is provided between a blowout chamber and a suction chamber provided near a bottle as an object to be processed, and a blowout chamber and a suction chamber. The blowout chamber has a blowout port, the suction chamber has a suction port, and the blowout port of the blowout chamber is disposed below the center of gravity of the bottle. And
[0038]
The second aspect is the invention of claim 1, wherein, in sum 3000～30000Mm ² of the area of the air outlet, as characterized by the air volume was combined in a range of ^{5m 3} / ^min~20m 3 / min I have.
[0039]
In addition, the arrangement of the suction port can be opposed to the outlet with the conveyor interposed therebetween as usual, but it may be arranged above the suction port. In addition, the shape is desirably a horizontally long shape in order to increase circulation efficiency, and the total area is desirably 3 to 20 times the total area of the outlets.
[0040]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described with reference to the embodiment shown in FIGS.
[0041]
1A and 1B show an embodiment of a bottle coating chamber 11 according to the present invention, wherein FIG. 1A is an external perspective view, FIG. 1B is a perspective view of an outlet and a suction port of FIG. 1A, and FIG. It is sectional drawing which shows the flow of a circulation blower.
[0042]
In FIG. 1A, the bottles 2 are arranged in a line in the front-rear direction on the upper surface of the moving conveyor 4 so as to move from the right side to the left side in the figure. A chamber block 11a is fixed on both sides of the conveyor 4 so as to straddle the conveyor 4, and a large-sized circulation blower 12 is mounted on an upper portion thereof. Further, the chamber block 11a is provided with a hole having a size for allowing the bottle 2 of the conveyor 4 to pass therethrough and penetrating back and forth. As shown by arrows, the chamber block 11a is provided with four connection ports (center) communicating with the large-sized circulation blower 12, and connection ports before and after communicating with an exhaust blower (not shown). In the case of FIG. 1 (A), the direction in which the connection port communicating with the circulation blower 12 is a downward arrow is the blowout chamber 11b, and the direction in which the connection port is upward is the suction chamber 11c. A reaction gas supply port 13 is provided below the blow-out chamber 11b.
[0043]
FIG. 1B shows a state in which the chamber block 11a has been removed from FIG. 1A except for the partition walls on the side of the blowing chamber 11b and the side of the suction chamber 11c surrounding the bottle 2 on the conveyor 4 on both sides. Each of these partition walls is provided with an air outlet 14 from the circulation blower 12 and a suction port 15 for returning the blown air to the circulation blower 12.
[0044]
FIG. 1C is a cross-sectional view of the chamber block 11a showing the flow of air from the circulation blower 12 taken along a line AA in FIG. 1B, which is viewed from a direction perpendicular to the flow of the conveyor 4, and is discharged from the circulation blower 12. The air (downward arrow) enters the blowing chamber 11b together with the gas from the reaction gas supply port 13 and is blown around the bottle 2 on the conveyor 4 from the blowing port 14 and passes from the suction port 15 through the suction chamber 11c. It turns upward and returns to the circulation blower 12 as shown by an upward arrow to circulate.
[0045]
2A and 2B show another embodiment of the coating chamber 11 for a bottle according to the present invention, wherein FIG. 2A is an external perspective view, FIG. 2B is a perspective view of the outlet and the inlet of FIG. () Is a sectional view showing the flow of the circulation blower.
[0046]
The difference between FIG. 2 and FIG. 1 is that in FIG. 1, the blowout chamber 11b and the suction chamber 11c are provided at the same height on the upper surface of the chamber block 11a, whereas in FIG. 1 is provided with an outlet 14 on the side of the outlet chamber 11b and an inlet 15 on the side of the suction chamber 11c with the partition wall interposed therebetween, while FIG. The difference is that an outlet 14 is provided below the partition wall 11b and a suction port 15 is provided above the same partition wall to communicate with the suction chamber 11c.
[0047]
Therefore, the flow of air from the circulation blower 12 is such that the air discharged from the circulation blower 12 flows into the blowing chamber 11b together with the gas from the reaction gas supply port 13 as shown in FIG. Is blown around the bottle 2 on the conveyor 4, goes around the top of the bottle 2, enters the suction chamber 11 c from the suction port 15 provided on the same partition wall, returns to the circulation blower 12 as shown by the arrow, and circulates. It has become.
[0048]
Here, FIG. 2C is a BB cross section of FIG. 2B.
[0049]
Since the present invention controls the temperature of the bottle immediately before the entrance of the chamber 11 as described above, it has a higher surface temperature than the ordinary hot end coating. As a result, a very high speed updraft is generated on the outer surface. Since the flow velocity of this rising air current is high enough to obtain alkali resistance, if a reaction gas is placed on this flow, a coating having alkali resistance can be formed.
[0050]
To summarize the above, the outlet 14 is installed at a position lower than the center of gravity G of the bottle 2 to prevent the bottle 2 from overturning, and by appropriately balancing the opening area and the air volume of the circulating blower, the partial coating is achieved. It is possible to form a film having high alkali resistance without unevenness.
[0051]
The above balance varies depending on the weight, height, body diameter, and production volume per unit time of the bottle. However, it is completely different from ordinary hot end coating.
[0052]
Sum of the opening areas of the air outlet is in the range from 3000 mm ² of 30,000 mm ² as a specific number. This is 1/5 to 1/2 of a normal chamber.
[0053]
When the capacity of the circulating blower 12 is converted into an air volume, it falls within a range of 5 m ³ / min to 20 m ³ / min. In order to obtain this air volume, a circulating blower having a capacity 20 times that of a normal air blower is required.
[0054]
Example Coating was performed using the coating chamber shown in FIG.
[0055]
The surface temperature of the bottle flowing on the machine conveyor at 133 mm intervals was controlled at 620 ± 20 ° C. Coating was performed using SnCl ₄ as the reaction gas while changing the blowing area and the amount of circulating air, and the amount of the reaction gas was adjusted so that the film thickness became 40 to 100 nm.
[0056]
The obtained bottle was immersed in a 4% NaOH solution at 80 ° C. for 6 hours, and the peeling of the coating was examined. Table 1 shows the results.
[0057]
[Table 1]

In Table 1 described above, “film thickness unevenness” was determined based on a portion in which a portion exceeding 130 nm occurred locally as a criterion for acceptability. The “alkali resistance” was determined based on whether the peeling of the coating was 1/50 or less of the whole. The “stability on the conveyor” was determined based on the criterion of not moving due to the circulating wind.
[0058]
As can be seen from these results, the total area of the outlets is in the range of 3000 to 30000 mm ² , and the air volume is in the range of 5 to 20 m ³ / min. In the case of 3, the combination of C and in the case of 4 the combination of D is preferable from the viewpoint of not causing unevenness of film thickness, having high alkali resistance, and obtaining the stability of the bottle.
[0059]
【The invention's effect】
As described above, the present invention includes a blowout chamber and a suction chamber provided in the vicinity of a bottle as an object to be processed, and a blower disposed between the blowout chamber and the suction chamber. It has an outlet, and the inlet chamber has an inlet, and the outlet of the outlet chamber is disposed below the center of gravity of the bottle, so that a stable treatment can be performed when coating the bottle. It becomes possible.
[0060]
According to claim 2, the total area of the air outlet and 3000～30000Mm ^2, the range of the airflow from the air outlet of the circulation blower and ^{5m 3} / ^min~20 3 / min, the optimum values within these ranges In combination, a good film can be formed.
[Brief description of the drawings]
1 shows an embodiment of a bottle coating chamber according to the present invention, (A) is an external perspective view, (B) is a perspective view of an outlet and a suction port portion of (A), and (C) is a circulation unit Sectional drawing which shows the flow of a blower.
FIGS. 2A and 2B show another embodiment of a bottle coating chamber according to the present invention, wherein FIG. 2A is an external perspective view, FIG. 2B is a perspective view of an outlet and a suction port of FIG. Sectional drawing which shows the flow of a circulation blower.
3A and 3B show a conventional bottle coating chamber, and FIG. 3A is an external perspective view and FIG. 3B is a cross-sectional view showing the flow of a circulation blower.
[Explanation of symbols]
2 Bottle 11 Coating chamber 11a Chamber block 11b Blow chamber 11c Blow chamber 12 Circulation blower 14 Blow outlet 15 Suction port

Claims (3)

A blow-off chamber and a suction chamber provided in the vicinity of a bottle as a processing object, and a blower disposed between the blow-out chamber and the suction chamber, wherein the blow-out chamber has a blow-out port; Has an inlet, the outlet of the outlet chamber is disposed below the center of gravity of the bottle, the total area of the outlet is in the range of 3000 to 30,000 mm ² , and the air volume is 5 m ³ / A bottle coating chamber in the range of min to 20 m < ³ > / min, wherein a combination of numerical values within these ranges is selected. The bottle coating chamber according to claim 1, wherein the outlet chamber and the suction chamber are provided at the same height. The bottle coating chamber according to claim 1, wherein the outlet chamber is disposed at a lower position than the suction chamber.

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