Maintenance methods of printing machinery


Published on:

2019-01-03

Abstract: Printing machinery installation - maintenance - maintenance - after-sales chapter: the maintenance of printing machinery in the notes and grease No. characteristics, uses and lubricants selection of the introduction. The following content is compiled by Buy.com and provided for your reference. The maintenance of printing machinery printing machinery maintenance as we all know, the development of the printing industry from a relatively simple offset printing method, gradually transformed into the now commonly used offset printing and increasingly thriving digital printing mode. The belief behind the promotion of this development model, of course, is based on the manufacturers of continuous improvement of production efficiency and improve the competitiveness of products in the market and the quality of the demand to appear. Therefore, each

Maintenance methods of printing machinery

Abstract: Printing machinery installation - maintenance - maintenance - after-sales chapter: the maintenance of printing machinery in the notes and grease No. characteristics, uses and lubricants selection of the introduction. The following content is compiled by buy.com and provided for your reference.

 

Printing machinery maintenance methods

Maintenance of printing machinery

As we all know, the development of the printing industry has gradually changed from the relatively simple offset printing method to the now commonly used offset printing and the growing digital printing model. The belief behind this development is, of course, based on the demand of manufacturers to continuously improve production efficiency and increase the competitiveness and quality of their products in the market. Therefore, various printing and other processing machinery and equipment (printing and coating equipment, printing and dispensing machines, printing and packaging hot melt glue machines) are emerging in the market at a rapid pace to meet and exceed the expectations of manufacturers. However, while these advanced machines are working day and night towards their production goals, many operational "hiccups" can arise, such as maintenance

When machinery is damaged, manufacturers generally assume that it is caused by normal operational wear and tear. However, today's machinery is made of high quality alloy steel and is supposed to last for a long time. Subsequently, manufacturers in the continuous payment of huge maintenance costs and delayed production of painful lessons, gradually began to find maintenance materials team to maintain the normal operation of printing machinery plays an important role, and in many of the maintenance materials, lubricants and related chemical products, is relatively neglected. Perhaps because the correct choice of these materials or not, will not cause immediate bad effects on the manufactured products produced by manufacturers. Problems with machinery and equipment are often only discovered after a long period of use.

Therefore, suppliers of these maintenance materials are required to:

1. Its products can reduce the number of mechanical damage and extend the service life of machinery;

2. Provide multi-functional design of product line, which can not only adapt to more requirements of machinery use, but also reduce unnecessary and excessive inventory of customers;

3. to teach customers to avoid the wrong use of maintenance materials;

4. To enable customers to simplify procurement procedures, thereby streamlining management procedures and saving valuable human resources;

5. often maintain sufficient product inventory, saving manufacturers time when ordering goods and avoiding the risk of downtime caused by the casual use of general "temporary substitutes";

6. To provide a long-term and stable supply channel through a network of reputable suppliers to meet the needs of customers for quality products and services.

Maintenance materials for printing presses and their related instruments include:

Lubricants-such as snow oil, chain tooth oil, pressure-resistant gearbox oil, etc.

Cleaners-such as after cleaners, ink roller cleaners, oil tube and oil circuit cleaners, etc.

Rust inhibitor - used for rust prevention and lubrication of cutter table and cutter.

Properties and Applications of Grease

In this issue, we will first introduce "grease" (snow oil). The types of grease can be broadly classified according to its hardness, pressure delivery, drip point, water resistance, and stability.

Hardness

Hardness, or needle penetration, is a measurable characteristic that must be considered when choosing the right grease. The hardness of the grease is determined by the number, 0 is the softest, then with the number 1, 2 and increase to 6. 6 hardness and soap bar the same. Garden mud easy to shovel into the softer, harder to shovel into the harder, grease hardness is the same, it is based on the cone meter from a certain height to fall grease penetration depth to grade. Printing machinery is required to add the appropriate hardness of grease in accordance with the requirements of the manufacturer of the printing press, otherwise the machine parts may cause insufficient lubrication or increased resistance.

Compressibility

Another characteristic of grease is the difficulty of pressurized transport; in the central grease supply system, two kinds of grease at room temperature are equally easy to pressurize and send, in the lower temperature environment, the pressurization is often very different. The difference comes from the type of lubricant and soap contained in the grease and the proportion of different. Some printing machines and stapling equipment is a centralized grease supply system to lubricate mechanical components, so it is extremely important to choose a grease with excellent pressurization.

Flow Drip Point

Due to the different soap bases in the grease, different greases will melt at different temperatures. The dropping point is the temperature of the grease from semi-solid to liquid; most calcium soap melts at 160-210°F, sodium soap 350-350°F, lithium soap 350-400°F, so the high temperature when using sodium soap or lithium soap is better. Nowadays, most of the printing machinery speed is quite high, due to the higher bearing rotation in the motor, bearing temperature also increased accordingly, the choice of higher flow drip point grease, can make the high-speed motor bearings such as "carbon pump" bearings have better protection.

Water resistance

Regardless of the contact with water, some greases still need to perform their lubrication role, so their water resistance is an important property. Calcium and lithium soap-based greases are insoluble in water, while sodium soap greases are soluble in water, so they cannot be used as lubricants that may come into contact with water. The printing process requires the mixing of water, so some bearings must be protected by greases with good water resistance, otherwise, the bearing life will be greatly reduced.

Stability

Some grease can still maintain its original hardness after adding into the bearing, that is to say, the stability is very high; this grease can work in the anti-wear bearing for a period of time and then softened, if there is no good seal will flow out from the bearing. In the printing process, the spraying powder is continuous and covers a lot. If the grease used is not stable, it will cause contaminants to easily enter the bearings and components, causing great damage to the printing machine.

Traditionally, the design and production of greases has been focused on dealing with a single problem faced by machinery and equipment. Such as high temperature, high speed, high pressure or anti-wear. Subsequently, due to the requirements of machinery manufacturers and the influence of increased competition in the market, the production of grease, only gradually tends to multi-functional direction. However, the general petroleum products always have their limits of use and cannot effectively meet the requirements of the rapid development of modern production equipment. Although it is not easy to choose the right lubricant, there are some professional lubricant suppliers in the market, which can provide professional data and long-term after-sales service, so as to reduce the mistakes of customers in the use and avoid wasting precious time and money. It is advisable to listen to the advice of the industry, which will help to protect the good performance of printing machines.

Selection of lubricants

The main lubricating materials for printing and related machinery are grease (snow oil) and lubricating oil (machine oil). The printing machinery also needs to use different kinds of lubricants according to the different needs of various machine parts. Such as chain oil, air pump oil or gearbox oil, etc.

The choice of quality lubricating oil can be based on its characteristics such as viscosity, oxidation resistance, anti-wear, water separation, etc. for reference and comparison.

Viscosity

Viscosity is one of the characteristics of a lubricant. It is measured by the fluidity of the oil at a fixed temperature. Most of the international SAE or ISO grade to the lubricant viscosity classification, generally used in the printing machine 68, 150, 320 and other viscosity lubricants is to ISO to grade, the higher the number viscosity is greater. The [viscosity index] is the rate of change of the viscosity of the lubricant in the known temperature range. A low viscosity index oil indicates a large change in viscosity in response to temperature. Conversely, a high viscosity index oil means that the corresponding change in viscosity to temperature is small. Lubricating oil in the circulation lubrication system of the printing machine is necessary to take away and cool the heat generated by the friction of each machine part. Therefore, choosing [high viscosity index] lubricant can keep the viscosity stable and greatly help to reduce the heat of the printing machine and prolong the service life of the printing machine.

Anti-oxidation

Lubricants are complex hydrocarbons. When they are exposed to air and heat, they slowly combine with oxygen in the air and change their chemical nature, making them unsuitable for lubrication purposes. The slow combination of oil and oxygen becomes oxidation, and the resulting product is called oxide. Printing machinery in the replacement of lubricating oil when it is not difficult to find out the change out of the tar and the original new oil injection when the change is great, plus in the oil compartment found impurities more sure lubricating oil because of oxidation and lost normal lubrication function. Choosing a high oxidation resistance oil can extend the oil change time, reduce the erosion of mechanical seals and reduce the leakage of oil from the printing press. Because the oxidized oil will become acidic and harden the seals, causing the possibility of increased leakage of printing machinery.

Abrasion resistance

If we place two pieces of iron with soaked surfaces together, and then drag the top iron away, it may take 15 pounds of force; if we add a little lubricant between the two iron surfaces, it may only take 2.5 pounds of force to pull it apart; therefore, we say [the oil reduces the friction between the iron pieces]. Under a high-powered microscope, the contact surfaces of the two pieces of iron actually show numerous small peaks and valleys holding each other in place to prevent them from sliding freely. If there is oil between them, the valleys are filled and the mutual restraint is released. The upper block can easily slide away from the lower one. This phenomenon is a good indication that the lubricant reduces wear, and the additives contained in a highly anti-wear lubricant are more than capable of filling in the [small valleys] above the metal, so that the parts are more than adequately protected. Secondly, by reducing friction, the components of the press have a longer life.

Water Separation

If water is mixed into the lubricant, it will generate emulsion and its lubricating performance will be poor. The lubricating oil of water separation can be mixed with water and after standing for a period of time, it will be separated from water automatically. This characteristic is called anti-emulsification, oil and water quickly separated, said the lubricant anti-emulsification good, and vice versa. When the lubricating oil is stirred and pumped in the printing machine, the water in the air will combine with the lubricating oil, resulting in an emulsion with poor lubricity. Selecting a lubricant with high water separation can provide sufficient protection for each component in the machinery and reduce the chance of oxidation.