JPS6035301B2 - Method and apparatus for forming a protective coating on the surface of a glass container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Glass derives its considerable strength from three initial surface states: no scratches, and no scratches or cracks on the surface. It is known to significantly reduce the strength of

Typically, glass containers exhibit their maximum strength when freshly formed, and this strength can be achieved, for example, during automatic operation 3.
Reduced by contact between containers and between containers and other surfaces. Thoroughly dry the outer glass surface. When coated with compositions that are wet scratch resistant and abrasion resistant (which inherently reduce the likelihood of breakage), large numbers of containers can be handled by reducing container spacing and increasing handling conveyor speeds. It will be appreciated that this also applies to glass surfaces that can be brought into contact with other glass surfaces or even other surfaces.

Since many articles, such as carbonated beverages, are packaged under pressure, the outer surface of glass containers should have fewer or no scratches to minimize the possibility of damage. Highly desirable. A variety of one-component and two-component coating compositions have been used to provide the desired durability, lubricity, abrasion resistance, and scratch resistance for handling.

U.S. Pat. No. 3,323,88y to O Carl et al.
The present invention relates to a method for increasing the scratch resistance of glass surfaces by polymerization treatment and also by coating with olefin polymers.

U.S. Pat. No. 3,368,915 to Carl et al. relates to abrasion resistant glass articles having two-component protective coatings obtained by the method described above. Also, U.S. Patent No. 3,40,
No. 3,015, No. 3,577,257, No. 3,598
, No. 632, No. 3.645,778, No. 2,813,
No. 045, No. 2,881,566, No. 2,982,6
No. 72, No. 3,258,444, No. 3,407,08
No. 5, No. 3,414,429, No. 3,418,153
No. 3,418,154, No. 3,425,85, No. 3,432,331, No. 3,438,801,
No. 3,441,39 Minor, No. 3,441,432 and No. 3,445,269 all relate to making glass surfaces abrasion resistant and the resulting glass articles. However, the use of two compounds capable of forming metal oxides, one of which is highly reactive with atmospheric moisture and the other compound with comparatively low reactivity with atmospheric moisture, These two
No method is disclosed in the above-mentioned literature to form an oxide-type two-component coating (primer) in an economical manner by simultaneously applying seed compounds onto a glass surface in a hot drying room air stream. Not yet. In addition, among the above two types of compounds, "compounds with relatively low reactivity with moisture in the atmosphere" are:
A function that protects "compounds that are highly reactive with moisture in the atmosphere," that is, a dessicating function.
ction). It is therefore an object of the present invention to form a highly abrasion-resistant two-component base coating on glass surfaces, which coating is highly resistant to abrasion and scratches and is economical. can be applied and help maintain the inherent strength properties of the glass.

Another object of the present invention is to provide a thin, substantially uniform, good coating on the glass surface, which coating is transparent, highly scratch and abrasion resistant, and is suitable for glass surfaces. This prevents the surface from weakening.

Such a uniform coating can be formed while advancing the glass article through the processing chamber through a fixed inlet for the processing gas without rotating the glass article. Another object of the invention is to coat a glass surface, such as a selected outer surface of a glass container, to render it scratch resistant;
The container is designed to withstand normal handling, filling, processing, and shipping such that the inherent friction and frequent contact between glass surfaces or with other surfaces does not result in a significant reduction in the strength of the glass article. An object of the present invention is to provide a method for coating a glass surface.

In achieving the object of the present invention, the main feature is that the glass surface is simultaneously treated with two types of thermally decomposable material-containing components, that is, two types of materials that are chemically decomposed by the action of heat. Forming metal oxides on the glass surface at a temperature above the pyrolysis temperature of the components and then cooling the two-component metallized surface, for example in a lehr, to provide a strengthened glass article. .

In this treatment method, a combination of highly moisture-reactive and low-moisture-reactive components is used to coat the glass surface, so during this coating process, the highly moisture-reactive components are protected by a low content of In the present invention, a tin compound is used as the first component with low moisture reactivity, and a titanium compound is used as the second component with high moisture reactivity.

In other words, in the present invention, both the "first tin-containing processing gas (steam) with low moisture reactivity" and the "titanium-containing processing gas (steam) with high moisture reactivity" are used.
Another feature of the invention is that all tin-containing compounds (
A glass surface is treated with a titanium-containing compound (first component) and a titanium-containing compound (second component), and the two components are applied onto the glass surface while the glass surface is at a temperature higher than the thermal decomposition temperature of these compounds. The oxide is allowed to form and the titanium-treated glass article is then allowed to cool, for example in a lehr.

This metal oxide treatment can be followed by coating with various organic protective coatings. The present invention will now be described in more detail with reference to the accompanying drawings. In the practice of the present invention, the glass articles are processed immediately upon leaving the glass forming equipment, with the glass articles being conveyed on a scraper conveyor to a lehr.

This means that immediately after forming, the glass article still retains considerable heat due to its molten state from the forming process. Two separate solutions of thermally decomposable compounds are sprayed in a defined pattern onto selected external surfaces of a glass article in a vaporized state at temperatures above the thermal decomposition temperatures of the two individual compounds. Thermal decomposition temperatures for many common types of tin and titanium compounds that may be used herein range from about 7000F to 1
3000F), and more preferably these C. about 482oo (9000F) to 6
It is 49qo (12000F). As shown in FIG. 1, a conveyor 10 is used to transport freshly formed glass bottles 11 from the forming apparatus into an evenly spaced array into a lehr.

The bottles are conveyed through a processing apparatus or processing hood 12 in an upright relationship over a conveyor surface. The bottle is
During such totally aqueous transport, no rotation is applied and a completely suitable and uniform surface treatment is achieved without rotation.

The processing hood 12 consists of two side ducts 13, 14, each of which has an inlet 15, 16 at one end and a discharge row 7, 18 at the other end.

The inlet and outlet of the hood 12 are located in a transversal relationship in an opposing arrangement on opposite sides of the conveyor. Parallel inlets and outlets with parallel side ducts can form a process gas recirculation loop for selected gases used to process the vessel.

The relative positions of the inlets, outlets and interconnecting side ducts are shown in Figures 1 and 2 in the limited horizontal extent of the conveyor, and the hood is located within the conveyor for short periods of horizontal conveyance. , surrounding the container. The first gas is introduced into one side duct 13 at one location, preferably at the side inlet 20 .

This gas serves to substantially fill the side duct 13 and surrounds the second gas introduced into the center of the gas stream at the conveyor inlet 15. The first gas performs a drying function for the second gas introduced into the gas stream in close proximity to the conveyed container 11. Another duct 21 is side duct 1
3 and directs clear auxiliary air across the conveyor near the area between the outlet 18 and the upper area of the inlet 15. A separate primary exhaust duct 22 for clear air extends transversely from the duct 21;
Remove swept air and excess gas across the conveyor. The clean air sweeps around the top or mouth of the container 11 to prevent metal oxides from adhering to it. A separate loop or secondary exhaust duct 23 extends from the central region of the hood parallel to the conveyor 10 to the primary exhaust duct 22 and collects excess process gas and clear air. Make sure to orient yourself to. Similarly, another auxiliary clear air duct 24 has an inlet 16 and an outlet 1
9 and sends clean air above the mouth of the container 11 to another primary outlet 25.

Another secondary exhaust duct 26 extends from the area near the outlet 19 at the inlet 16 above the central downstream side of the conveyor to collect the process gas and excess clarified air and direct it to the primary exhaust duct 25. FIG. 2 schematically shows side-by-side inlets and outlets at each of two adjacent application positions along a conveyor, with corresponding parts facing each other in a substantially closed loop arrangement.

FIG. 3 shows one inlet 15, with the first gas being sent to the inlet through a side duct 13 fed from a side inlet 20. Clear air is directed from the upper duct 21 to the neck and mouth of the container. The second gas is introduced into the center of its flow in the inlet area below the auxiliary clear air duct 21 by means of a perforated tube 30 with a series of closures 30a. The opening □ directs the second gas toward the container and into the center of the flow pattern adjacent to the container 11. As described, two separate solutions of thermally decomposable compounds are delivered to the body of the glass container. The vaporized solution is directed into the container in a defined flow pattern and impinges on the container at a temperature above the pyrolysis temperature of the two individual coating compounds (preferably containing tin and titanium). FIG. 5 shows that a tin-containing compound, preferably tin chloride, is present at inlet 1.
The block diagram shows how it is vaporized by air at position A prior to being fed to side duct 20 and then to the two side ducts 13 and 14 for being sent to 5, 16.

a second titanium-containing compound, preferably titanium tetrachloride, is fed at position B and from there into the mixing tee E;
Here it is intermixed with hot, dry, pressurized air from locations C and D. The titanium compound vaporized by air is sent to the next two pipes 30, each having an opening 30a in a row. The two gases are preferably in a gaseous state with a volume ratio of the second component to the first component of about 2:1 to 8:1, assuming both gases are generated at the same pressure and temperature. mixed.

Titanium compounds are more highly reactive with moisture than tin compounds and therefore have a larger amount of space to react with moisture in a hydrolytic reaction before hitting the glass surface.

Titanium compounds that have reacted with moisture cannot form a durable or uniform metal oxide film on the glass surface. This is often the case when titanium tetrachloride alone is sprayed onto a hot glass surface as the first coating. Titanium compounds that react with water vapor have a tendency to clog vaporization nozzles with hydrolyzed products, resulting in intermittent spray patterns and inconsistent results.

The defined flow pattern in which the titanium compound is centered in the flow surrounded by the tin compound in accordance with the present invention is combined so that both metal oxides form a consistently adhesive, uniform coating. is preferable for uniformly depositing on the glass surface. The tatin compound used in the present invention is a compound that can react to form titanium oxide on contact with a heated surface.

Suitable titanium-containing compounds include titanium halides, especially titanium tetrachloride. Ammonium salts of titanium lactate are also suitable. Furthermore, volatile metal-organic compounds, such as alkyl titanates, in which the alkyl group preferably contains from 1 to 8 carbon atoms, are also suitable. Alkyl titanates that may be used include tetrabutyl titanate, tetranepropyl titanate, tetramethyl titanate, tetraethyl titanate, tetranonyl titanate, and the like. Tin compounds that can be used for the purposes of the present invention include stannous and stannic compounds. Suitable stannic compounds include stannic halides and alkyl stannic carboxylates. The stannic halide has
Examples include stannic chloride, stannic bromide, and stannic iodide.

Alkyl stannic carboxylate has the general formula (R,) x
The alkyl group having Sn(00CR2)y (where R, and R2 are alkyl groups, and x and y are integers from 1 to 3, the sum of which is 4) is a branched You don't have to do it or not. R2 alkyl groups preferably contain 1 to 18 carbon atoms, such as stearate, palmitate, laurate, and the like. R. Alkyl groups preferably contain from 1 to 8 carbon atoms, such as methyl, propyl, butyl, isopropyl, isobutyl, hexyl, octyl, and the like. Compounds falling within the foregoing range include dibutyltin dichloride, butyltin acetate, dipropyltin diacetate, dioctyltin diacetate, dibutyltin distearate, dibutyltin dipalmitate, dibutyltin dilaurate, dibutyltin mafute, and the like. Suitable stannous compounds for the purposes of the present invention include stannous dihalides such as stannous chloride, stannous bromide, stannous iodide and stannous carboxylates.

Stannous carboxylates include compounds having the formula Sn(COOC)2, where R is an aliphatic or aromatic group.

Aliphatic groups include substituted (or unsubstituted) alkyl groups having up to 18 carbon atoms. Aromatic groups include aryl, pendyl, f. There are alicyclic carboxylic acids such as -yl, naphthyl, etc. Carboxylic acid salts suitable for the purposes of the present invention include stannous oleate, stannous palmitate, stannous stearate, stannous laurate, stannous naphthenate, stannous tartrate, stannous gluconate. Examples include tin and stannous acetate. It will be appreciated that any titanium or tin compound that can form an oxide on the glass surface at the reaction temperatures indicated may be used. The titanium compound and tin compound preferably used in the present invention react with the heated glass surface to form a T
It is a compound of a combination of i02 and Sn02 that forms a substantially colorless and transparent coating of metal oxides. The combined oxide coating adheres tightly to the glass surface and has a thickness on the order of a few microns. Such a two-component coating serves as a base layer for an overlying second coating, preferably of organic material, applied at low temperatures. The glass article coated with the thin, two-component oxide basecoat is then transferred to a lehr where it is progressively cooled and stress annealed for a period of time.

After being cooled to a temperature of 204q0 (4000F) or less during the second half of the slow cooling cycle, the glass article is typically sprayed with a second application of a polyethylene emulsion, for example to create a protective lubricious coating. . Such second coatings will vary greatly depending on end use conditions and do not form part of this invention. A second coating of such polyethylene constitutes a typical protective coating and is available, for example, under the trade name "Dmacote".
wem-01inojs, lm, (Toledo, 0h
There is a polyethylene emulsion produced by io). Pa plateer and Sch dated August 8, 1961
U.S. Patent No. 2,995,533 to Aefer, “Lubricant Coating for Glass Articles”
entitled "GlassWare" discloses the production and use of polyethylene emulsions as lubricating coatings for glass containers.

The organic coating composition may be applied by any suitable device such as a transverse spray nozzle that delivers a uniform amount of organic material per unit area of the lehr belt. This amount is approximately 6.35 k9 (per 100 square feet) for rare belts without organic coating, and 12.70 k9 (without 1/2) per 100 square feet.
It is often made into 1 quart. The organic protective coating is applied near the cold end of the layer, i.e. when the glass article is in the temperature range from about 1000F to 400F
Preferably, the spray is applied when the temperature is at 0 and F). To further describe the first substrate strength to which the present invention is primarily concerned, the second component of the gas treatment is typically a highly moisture-reactive gas, which, for example, typically cannot be satisfactorily applied to glass surfaces alone. It is titanium tetrachloride.

At the very least, such reactive vaporized components do not suffer from failure problems when used alone to coat glass articles over long periods of time.

According to the invention, this compound in gaseous state is combined in controlled quantities with a heated, dry stream of pressurized air for delivery to a central region at the inlet of the processing hood. Drying of process gas. The ratio of hot air to dry air is carefully adjusted. Hot air is usually used in excess to prevent hydrolysis of the process gas.

The second gas is preferably titanium tetrachloride because of its economical price and easy availability.

This is combined with heated dry air and mixed tea immediately before use. Dry. The hot air has a temperature of about 149 qC (300 qC).
0F), approximately 162. It has a fog point lower than 0 (-800F). Mixed TICL and heat. The drying air is routed together into a perforated tube mounted vertically in the center of the inlet. Two such inlets are used in the processing chamber on opposite sides of the belt conveyor of containers.

Each perforated tube has a series of proximate closures facing the transport container, the closures preferably being about 1.6 lateral (1/16
) inches in diameter. Each tube is centrally located in an inlet duct that conveys a first gas with low moisture reactivity (eg, stannic chloride) to the inlet region. SnC13 is normally carried by dry, heated air in the inlet duct;
The second gas (for example, TICL) that is more reactive to moisture is encapsulated. In this manner, the TIC 14 is protected from reaction with atmospheric moisture prior to being delivered to the adjacent hot glass surface. The two metal-containing gases are directed to the hot glass surface of the container and deposit thereon in the form of metal oxides.

The body of the container usually consists of the selected surface area of the container for such application, and the mouth of the container comprises an auxiliary heat source. It is protected by supplying dry air to prevent metal oxides from adhering to it. The first and second gaseous components flowing under pressure across the conveyor within the processing chamber include:
Wrap the outer surface of the container body to form a uniform coating.

Excess process gas is transferred to a second inlet through an exhaust port that screens from the inlet and through a side duct extending parallel to the conveyor. A secondary perforated tube is located perpendicular to the second inlet oriented across the conveyor.

A second treatment gas (ie, TICL) in an amount equal to the amount introduced at the first inlet is then introduced at the second inlet. Two metal-containing gases, namely TIC14 and S
The nC14 is forced across the conveyor belt from the opposite direction and strikes the other side of the container body surface.

At both inlets of the processing chamber, a second gas or TICL
' Well, surrounded by the first gas, namely SnC14,
Thus, little or no adverse reaction of the sensitive second gas with the moisture occurs. The outer surface of the container is thus coated substantially evenly around the body and at the top and bottom, leaving the mouth of the container uncoated. The outer surface of the unrotated container has some variation in thickness from the side facing the inlet to the shaft side of the conveyor within the desired range of uniformity for improved durability. Excess treatment gas from the second inlet is deflected through a side duct parallel to the axis of the conveyor to the first inlet, where the gas treatment loop is completed.

Apart from a container gateway, which is located at the opposite end of the processing hood and is fitted for the conveyor belt to pass through, and over which the glass container is moved, the hood is designed for maximum efficiency in container processing. is completely closed. Titanium tetrachloride compounds are considerably cheaper ingredients than stannic chloride compounds, allowing for more economical coating of glass articles. Since the amount ratio of the second component to the first component can be varied within a wide range, significantly larger amounts of the cheaper component can be used, thus significantly lowering the coating price.

The volume ratio of the second component to the first component is such that both components are at the same temperature.
Assuming that it is obtained at the same pressure, it is suitably about 2:1: 8:
It may be in the range of 1. Thus substantially more TIC14 (first component) can be deposited together in combination with SnCL (second component) in a combined single application to the glass container. Both metals from the same periodic table genus allow for combination as a thin coating with physical and chemical properties somewhat similar to the individual oxides when deposited as thin films alone. The treatment results using a combined mixture of tin oxide and titanium oxide compare well with the results obtained with tin oxide alone. Material costs can be significantly reduced by using a mixture of a tin compound and a titanium compound versus a tin compound alone. The size of the closure of the perforated tube delivering the TIC 14 to the gas stream is not critical, but should be such that the TICL is combined with super-dry hot air and introduced into the center of the combined stream close to the point of deposition. It is important that the

The amount of dry air is important, usually heated,
Fifty to one hundred cubic feet of over-dry propellant air per hour is used to convey the TIC 14 to the feed tube. A total flow rate of 0.84 to 2.80 (30 to 100 cubic feet) per hour of mixed working TIC 14 containing steam is delivered to the gas stream for application of the container. By preventing metal oxide coatings from accessing the mouth of the container (e.g. tin oxide, especially in small quantities), corrosion of the steel cap can be prevented when the container is filled and capped in this manner. prevented or significantly reduced.

A two-component coating of tin oxide and titanium oxide is combined with an organic surfactant applied at low temperatures to obtain a scratch-resistant, strength-retaining, lubricating external coating for glass containers. Will.

It is possible to achieve uniformly distributed coating of chemically reactive metal oxides in a glass container before slow cooling. Two-component coatings with tin-titanium take advantage of the best properties of both materials, namely the uniformity of application of SnC14 and the low cost of the TIC1, material, comparable to that achieved with the use of tin-containing materials alone. Acceptable coating distributions can be obtained at very low cost per container. The method of the present invention is based on SnC1
4 can be used with existing types of processing hoods or chambers designed for single processing.

Only a hot air mixer and perforated tubes to transport the TICL are needed for use with the enclosed second gas. In this way, both materials can be applied to the same device and, if desired, require only minor modifications to the standard type hood. Recirculated SnC14 vapor tends to shield the TIC14 vapor, making the resulting coating more uniform but significantly less expensive. Stannic chloride (SnC14) can be prepared by boiling dry air.
00F) or even lower fog point], or by dry nitrogen or by passing this dry air through the liquid material to create vapor at a given temperature (usually room temperature).

Titanium tetrachloride (TIC14) vapor is heated, dry air (151.100 F (1600 F) or lower fog point),
Dry nitrogen can be similarly generated using liquid TIC 14 to form vapor. Both vapors are introduced into the processing chamber and the tin vapor is recirculated vapor/
introduced into the air stream. The titanium vapor is preferably about 149
qo (3000F) or above and introduced into the processing chamber at two locations in close proximity to the glass article being processed. Normally, 0.00 ml per hour of boiling gas. If the clearance (30 cubic feet) is required to obtain a tin oxide coating on the glass container surface, the minimum amount required to achieve good scratch protection (appropriate organic lubricant dry air boiled through TIC 14 (80
cubic feet), boiling the required gas
It is possible to achieve two-component tin-titanium coatings with as little as 0.28 to 0.42 cubic feet (10 to 15 cubic feet) per CLI hour.

At a given room temperature, a tin to titanium flow rate ratio of 1:6 to 1:8 can form the desired combination coating on the glass surface. The following table shows a typical method comparison between the results of a known coating method using only tin and a known coating method using only titanium, and a two-component coating method using both metals in terms of material consumption. It is shown along with the amount.

Coating thicknesses are also listed along with vaporization flow velocities for comparison. Table 1 Materials Vaporized products Maximum value Minimum Average coating film Tin consumption Titanium top flow velocity Thickness
Thickness Cost 1. SnC Otsu”

0.55K evening/hr alone 〇. 84 soh
r(30cM〆)2.8:, 33,5cTU(1,
22≠/hr)〇. , Isoru r2. TiC alone
2. o4 HR (80CFH) 7.2:1
22.0CTU (0-4 potatoes/hr)
3. Two-component coating SnC Otsu 4 o. 287 sword three soh
r (IOCFH) 0
．． 18&/hr o. 1 ball Tazo hrTiC Otsu 4
2. o4 Tsuhr (80CFH) 4.8:1
41.2 CTU (0.4 temple/hr) (04 potato/hr
) Material Vaporized product Maximum value Minimum Average coating film Tin consumption Titanium flow velocity Thickness Thickness Cost amount 4. Two-component coating SnC and 4 o. 42 3 sohr (15C
FH) 0.27K evening/
hr o. i8K TanohrTiCZ4 2. o
4M3 sohr (80CFH) 3.05:1 41
．． 0CTU (0.6≠/hr) (0.4ax hr)*
CFH=ft3/hr

[Brief explanation of drawings]

FIG. 1 is a schematic flow diagram of the gas flow of the coating device of the invention, showing transported bottles and a conveyor belt. FIG. 2 is a schematic plan view of the applicator of FIG. 1, showing the gas flow and bottle rice conveyor. FIG. 3 is a partial side view taken along line 3--3 of FIG. 2 showing the tubular transfer device for the first gaseous component and the plurality of ducts of the application device. FIG. 4 is a largely perspective view of the tubular transfer device for delivering the first gaseous component to the bottle;
FIG. 5 is a schematic block diagram of gas flow to the coating device. 10... Conveyor, 11... Glass bottle, 12... Processing device, 13, 14...
・Side duct, 15, 16...Entrance, 17,
18...Discharge port, 20...Side entrance, 21...
...Duct, 22...Primary discharge duct, 23...
Secondary discharge duct, 25... Primary discharge port, 26...
... Secondary discharge port, 30 ... Perforated pipe. ′ -Eee' 1 1 ・ - Ri-ichi"``Spicy-' Sanyo-

Claims (1)

[Scope of Claims] 1. In order to form a protective coating on selected outer surface portions of a glass container, an atmosphere of a pyrolyzable treatment gas containing at least two components is formed, and the treatment gas is A positive flow pattern is created from the inlet to the exhaust means by introducing the process gas into the processing chamber through an inlet and discharging the process gas from the process chamber through an exhaust means, with the proviso that the extent of the flow pattern is within the range of locations within the pattern. A method for forming a protective coating on selected outer surface portions of a glass container configured to be substantially limited to only selected outer surface portions of the glass container, wherein The flow of the first tin-containing processing gas is limited to the shape of the flow pattern to reliably create the flow pattern, and the second titanium-containing processing gas having high moisture reactivity is caused to flow in the shape of the flow pattern. A method for forming a protective coating on selected outer surface portions of a glass container, characterized in that the coating is introduced into the central portion of the container. 2. Claim 1 comprising the step of generating a second titanium tetrachloride-containing processing gas with high moisture reactivity and a first stannic chloride-containing processing gas with low moisture reactivity. The method described in Section 1. 3 heating dry air having a dew point below about -62.2°C (-80°F) to at least about 149°C (300°F) before mixing with the process gas. The method described in Scope No. 2. 4. A second titanium tetrachloride-containing gas with high moisture reactivity is placed in the center of the flow pattern of the first stannic chloride-containing gas with low moisture reactivity that exists around the center of the flow pattern of the processing gas. 3. The method of claim 2, further comprising the step of injecting from said inlet. 5 Both components in gaseous state have the same temperature. Assuming that it was special because of the same pressure,
3. The method of claim 2, wherein the volume ratio of the second treatment gas component to the first treatment gas component in the total treatment gas is about 2:1 to 8:1. 6. A plurality of glass containers are continuously moved and passed in an upright position separated from each other through parallel closed processing hoods that are open at both ends, and the hoods extend along both sides of the travel path of the glass containers. forming a side duct including a pair of vertical separating walls, a pair of inlets and discharge means for process gas being mounted across the travel path of the container at the distal end of the side duct; a selected outer surface of the glass container, the inlet and the outlet means being arranged opposite each other to form a closed loop of the first tin-containing process gas throughout the side duct; In a gas treatment apparatus for forming a coating on a part, means for introducing a highly moisture-reactive second titanium-containing treatment gas through the inlet into the center of the flow pattern of the first treatment gas; Prior to supplying the second processing gas to the central part of the
A gas treatment apparatus for forming a coating on selected outer surface portions of a glass container, further comprising means for mixing the second treatment gas with dry heated air. 7. A patent characterized in that the introduction means for introducing a highly moisture-reactive second process gas comprises a vertically arranged perforated tube mounted in a substantially central portion of each of the inlets. A gas processing device comprising the hood according to claim 6.
8 A pair of side ducts extending parallel to the direction of travel of the container through the hood, two inlets arranged to face each other on the sides of the hood, and two exhausts facing each of the inlets. a closed loop for process gas circulation, including an outlet, said side duct, an inlet and an outlet for delivering the first and second gas components combined as a continuous gas stream that hits the container being conveyed twice from each side; A gas processing device having a hood according to claim 6, characterized in that the hood is formed of a hood.