JPS582242A - Treatment of glass product - Google Patents

Abstract

PURPOSE:To prevent the occurrence of a whitening phenomenon in the secondarily worked part of each glass product and to enhance the scratching resistance value of the product by forming a coat on the product by contact with vapor of a metallic compound under specified conditions and by carrying out secondary working and strain relief treatment. CONSTITUTION:Each glass vessel 2 discharged from a molding device 1 is introduced into a partial cooling stage, and by spouting air on the mouth of the vessel from a cooling pipe 4, the part to be secondarily worked is regulated to a temp. below the reaction temp. of a metallic compound by cooling. The vessel 2 is then introduced into a coating hood 7 and brought into contact with vapor of dimethyltin dichloride or the like to form a coat of tin oxide or the like on the body of the vessel 2. This vessel 2 is carried to an edging device 8, edged, and immediately introduced into a slow cooling furnace 9, where it is subjected to strain relief treatment. By this method no whitening phenomenon is recognized in the mouth of the vessel 2, and the scratching resistance value of the glass product is efficiently enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for treating glass products, and more particularly to a method for preventing the occurrence of whitening phenomenon and increasing the scratch resistance value of secondary processed parts of glass products.

Conventionally, the scratch resistance value on the surface of glass products has been increased, and the strength of the glass products has been improved by vaporizing or using organic metal compounds such as mechanical organic zirconium compounds or metal halide compounds such as tin tetrachloride and titanium tetrachloride. This is a well-known method in which metal oxide is atomized, brought into contact with a high-temperature glass surface, and then thermally decomposed on the surface to form a metal oxide film. According to this conventional method, a metal oxide film is formed on all surfaces where a metal compound and a high-temperature glass product come into contact. Forming such a material poses various problems. For example, glass containers go through a secondary processing process called a roasting process in which the mouth part is reheated, but if a metal oxide film is present on the mouth part, an extremely inconvenient phenomenon occurs in which the area becomes white.

In order to prevent the occurrence of such inconvenient phenomena, efforts have been made to avoid the formation of a metal oxide film on the mouth of the container as much as possible. For example, in a coating hood for bringing metal compound vapor, etc. into contact with a glass container, an air curtain or a shielding plate is used to block the flow of erroneous vapor, etc. in order to prevent the vapor, etc. from coming into contact with the mouth of the container. methods, etc.

However, with these methods, it is impossible to completely prevent the flow of vapor, etc., due to the special shape factor of glass containers that are manufactured in large quantities and of many types.
Metal oxide coating on the container mouth could not be completely prevented. In addition, if the prevention of the whitening phenomenon is completely prevented, the scratch resistance value will be compromised, and furthermore, there will be problems such as waste of coating agent and deterioration of environmental hygiene.

In view of the actual state of the prior art, the present inventors have determined whether it is sufficient = i
As a result of extensive research in order to completely prevent the occurrence of whitening due to increased resistance and burnt mouth, we have identified the conditions under which metallized/i-based vapors come into contact with the glass surface.
We have seen the completion of this invention.

The first object of the present invention is to perform the first secondary processing of glass products in an i
It is an object of the present invention to provide a glass product which does not cause a whitening phenomenon even when exposed to p, and has sufficiently improved scratch resistance.

The second object of the present invention is to provide mass-produced glass containers with
It is an object of the present invention to provide a method that can efficiently achieve sufficient scratch resistance for one shift and prevent the whitening phenomenon in the mass production process, and can be conveniently adapted.

The configuration of the present invention necessary to achieve the above objectives is to control the temperature of the part of the glass product to be subjected to secondary processing to a temperature lower than the reaction temperature of the metal compound, and to bring the glass product into contact with the vapor etc. of the metal compound. After forming a metal oxide film on a portion other than the portion, the portion is subjected to secondary processing and post-processing such as strain removal treatment. This will be explained in detail below.

For example, glass products, especially glass containers, after coming out of a molding machine usually have a temperature below their softening point, and there remains a fine protrusion of the molding part, especially at the mouth, which is usually removed immediately before strain removal treatment. The material is then partially reheated to a temperature above its softening point and remelted, leaving it at a secondary processing facility. On the other hand, due to the scratch resistance value of the glass surface, a metal oxide film is formed on the surface, but this is usually done by applying a predetermined coating agent to the high temperature glass product surface immediately after molding. As described above, when the secondary processing is performed in the presence of the -C1 film, a whitening phenomenon occurs. The cause of the whitening phenomenon is not clear, but the higher the reheating temperature within a certain range, the greater the degree of whitening.
It is presumed that when cooled to room temperature, a portion of the coating peeled off due to a difference in thermal contraction based on the difference in thermal expansion coefficient between the metal oxide and the Gafne body, and light was scattered at that portion.

In view of the above-mentioned steps, the present inventors believe that it is best to completely eliminate the formation of the metal oxide film itself in the secondary processing part,
The present invention was completed based on the knowledge that the vapor of a metal compound as a coating agent does not adhere to the glass surface below a certain temperature and does not form a film that causes a whitening phenomenon. In other words, the key point of the present invention is that before the process of forming a metal oxide film by applying the vapor of a metal compound to the glass surface, the temperature at the required location is set to a temperature at which it is difficult to form a metal oxide film. It is to adjust to. More specifically, the temperature of the glass product after exiting the molding machine is approximately 550°C to 700°C, at which temperature any metal compounds that come into contact with it will decompose and react to form metal on all contact surfaces. This is disadvantageous because an oxide film is deposited.

Therefore, a part of the glass product, i.e., a secondary processed part, for example, the opening of a glass container, is heated to a temperature below the reaction temperature of the metal compound, that is, about 450°C, before contact with the vapor of the metal compound.
By adjusting the temperature below, the reaction of the metal compound is inhibited, or even if the metal compound reacts, the formation of a metal oxide film that would cause a whitening phenomenon is prevented. The vapor of the metal compound refers to the atmosphere in which the organometallic compound such as the organotin compound, organotitanium compound, or organic zirconium compound or metal halide compound such as tin tetrachloride or titanium tetrachloride is heated and evaporated. An atmosphere in which a solution of a compound is sprayed. Temperature adjustment in the present invention is carried out by spraying a cooling medium onto the secondary processed portion of the glass product. As the cooling medium, air is most commonly used, but in particular when short-term cooling is required, carbon dioxide, water spray, etc. are used. Such adjustments can be made by setting the cooling time relative to the amount of heat stored in the glass, since the relative heat transfer charge per unit time is calculated based on the amount of heat stored in the glass, the temperature of the cooling medium, the speed at the glass surface, etc. It can be done easily.

In addition, in such cooling, if the temperature difference with other parts becomes more than a certain level, abnormal stress will be generated due to the temperature difference, which will cause an extremely inconvenient situation of self-damage, so this must be avoided. The limit of the temperature difference varies slightly depending on the Nikkei and wall thickness of the glass container, but in general, it is per llnm]
5°C, and the temperature is set to within 4 degrees.
jIt is necessary to keep in mind the adjustment. That is, when handling glass products, uncontrolled cooling or heating usually causes damage due to stress imbalance, and the case of the present invention is no exception. Therefore, it goes without saying that the speed of cooling before coating and heating after coating must not be rapid.

In addition, in the secondary processing of a portion of the glass product mentioned above, in order to particularly suppress the tendency for the temperature difference to increase, it is necessary to introduce the strain removal process as soon as possible after the process, immediately before the strain removal process. This process is carried out in this way.

Next, examples of the present invention will be described.

1. Glass containers (capacity 1000, shoulders 19, weight 63 oy) 2 coming out of glass container molding machine (18 machines) 1 were transferred by conveyor 3 and introduced into a partial cooling process. The partial cooling process consists of cooling pipes 4 installed on both sides of the conveyor 3, air transfer pipes connected thereto, a compressor, etc. (not shown). In this example, compressed air was used as the cooling medium, and air was injected from the cooling pipe 4 into the mouth 5 of the glass container for cooling. The average temperature of the mouth of the glass container before cooling is 6.
1000 and used cooling air at a temperature of about 12°C. Furthermore, the distance between the glass container mouth 5 and the cooling pipe nozzle/l/6 is approximately 3.5".

The air nozzle speed was 17 m/s - the speed at the container mouth was 12 m/sao. The length of cooling pipe 4 is 1'2fi.
Since the speed of the conveyor 3 was set to approximately 39 m/sao, this was jet cooling for 4 seconds.The temperature at the mouth of the glass container after cooling was approximately 38,000.The temperature at the body of the glass container The temperature was maintained at approximately 560°C.Then, the glass container was introduced into the adjacent coating hood, and the hood was filled with approximately B my/N,l.
A tin oxide film was formed on the body of the glass container by contacting it with vapor of dimethy/I/tin dichloride at a concentration of 1. Thereafter, it was transferred via a curved conveyor to a calcining device 8 placed in a lehr 9, subjected to calcining treatment, and immediately introduced to an annealing furnace 9 for strain removal treatment. No whitening phenomenon was observed at the mouth of the glass container that came out after slow cooling. The scratch resistance value of the glass heat storage amount was no different from that in which only the increase in the scratch resistance value was targeted.

As described above in detail, the present invention can prevent the formation of metal oxides on the mouth of a glass container, and can fundamentally eliminate the occurrence of whitening phenomenon at least in post-processing such as the roasting process. Therefore, in the treatment process, it is now possible to focus only on improving the scratch resistance value. It is important to our industry that this has enabled us to increase the efficiency of improving the scratch resistance of glass products during the mass production process, reduce waste of coating agents, and improve environmental hygiene. It makes a big contribution.

[Brief explanation of the drawing]

FIG. 1 shows a process schematic diagram of an embodiment of the present invention. FIG. 2 is a schematic diagram showing the positional relationship between the mouth of the glass container and the cooling pipe nozzle. 2...Glass container, 4...Cooling pipe, 5
・・・・Glass container opening, 7...Coating hood, 8... Mouth burning device, 9...Learning furnace patent applicant Ishizuka Glass Co., Ltd.

Claims (1)

[Scope of Claims] l) The temperature of the part of the glass product to be subjected to secondary processing is adjusted to a temperature lower than the reaction temperature of the metal compound, and the glass product is brought into contact with the vapor of the metal compound to be applied to parts other than the part. 1. A method for treating glass products, which comprises forming a metal oxide film and then performing secondary processing on the portion and subjecting it to post-treatment such as strain removal treatment. 2) The method for treating glass products according to claim 1, wherein the temperature below the reaction temperature of the metal compound is 450'0 or below.