Cardboard Problem Solving - Corrugation High and Low

Sixth to solve the problem of high paperboard defects

Nowadays, the requirements for the production quality of the carton factory are getting higher and higher, and the development of cardboard “lightweight” is a problem that most colleagues in the carton factory are thinking about. The “lightweight” of cardboard means that the paperboard produced is becoming thinner and thinner. However, the cardboard is “lightweight” and the possibility that the corrugated board is crushed is higher. The author hereby shares his practical experience at the production site. .

â–  Raw materials

The corrugated paper used by us must meet the national standards. When we produce 105 g of corrugated paper, we must base paper manufacturers to achieve Class B national standard (C class paper is not easy to produce corrugated crushing due to insufficient ring pressure), so we have quality control for each carton factory. The work must be done. The company first sets a good corporate standard, and then asks our suppliers to do it. Table 1 shows that a carton manufacturer refers to a national standard;

Every batch of raw paper is required to be inspected by QC. Never allow unqualified products to flow into the production area. Non-conforming products must be isolated and clearly marked.

â–  Single tile machine

temperature

Whether the temperature of the corrugating roller is sufficient (when the temperature of the corrugated rod is not enough, the corrugated height produced during production is not enough). Generally, a well-managed company will send someone to inspect the temperature of the entire assembly line (generally, boiler workers are recommended to do this work). When there is a temperature problem, the supervisor in charge and the captain of the machine are notified in time to notify the mechanic to handle it, and to inspect and overhaul all the preheated cylinders one month later.

Corrugated roller surface with dirt

The corrugated roll is preheated and cleaned with light oil or silicon before starting up every day. The scum and trash on the corrugating roll are removed.

gap

The gap between the rollers is very important in production and is divided into:

The gap between the paste roll and the corrugating roll (usually when the corrugating roll is preheated for 30 minutes, the expansion of the corrugating roll is maximized, and the thickness of a piece of tile with the lowest grammage in the company is used as the gap) must be checked before starting the machine every day.

The gap between the corrugating roller and the pressure roller (generally depending on the production conditions, the backing paper has a slight pressure line, to ensure a good fit).

The gap between the upper corrugating roller and the lower corrugating roller (this is very important, because when the two gaps are not adjusted, the corrugated shape it makes is irregular, the most prone to thick, insufficient phenomenon) Corrugating roller wear degree

Always pay attention to the production situation, and check the production status of the corrugated iron at any time. Is it necessary to go to the point of replacement? Generally, the hard-coated corrugated roll can run 6 million to 8 million meters (domestic) and 8 to 12 million meters (foreign countries). Now more advanced is the tungsten carbide plated corrugated roller can run 30 million - 40 million meters. The specific price is almost the same, the specific purchase situation should be based on the actual situation of each carton factory, for some well-managed carton factory, it is recommended to use the third, because the high wear resistance of tungsten carbide corrugating roller will really Our production costs are reduced, and in the case of smooth operation, it is estimated that the cost will be harvested within six to eight months.

We must pay special attention to the corrugating roller during production. The operation method is the biggest problem. Therefore, it is recommended here that every carton manufacturer must determine the operation target according to its own actual situation; er, the operator must strictly follow the requirements, and the supervisor must promptly Play the role of supervision.

â–  Paper flyover

Single-tile machine paper flyover

Do not accumulate too many single tiles on the bridge, increase the tension, will drag a single cardboard, resulting in a lack of cardboard thickness, it is recommended that everyone install a computer production management system, so that you can effectively prevent the occurrence of such events. At present, many domestic manufacturers are developing production management systems for carton factories. However, it is recommended that carton manufacturers should carefully consider them so as to avoid unnecessary waste.

The influence of the suction of the flyover, the overdraft suction is too large, it is easy to drag the corrugated, it is necessary to pay attention to the rotation of each axis, there is the angle of the situation, the parallelism of each axis should always detect, always pay attention.

Laminating machine (double-sided machine)

This is also a top priority. Many companies have problems here.

The roller pressure on the paste roller is too low to adjust the gap of the roller. The author personally saw the operator of a paper mill to adjust the gap to 1. Omm (the actual corrugation height is 2.5mm). Do not crush because of the cardboard.

The author believes that this phenomenon is common in many companies. It is recommended that: generally down 2mm ~ 3mm (according to the actual)

What is the radial and axial runout of the press roll (certainly not elliptical)

Nowadays, more and more people begin to choose to use a pressure bar as a rider (pressure roller)

This is a great innovation, but there is also a big one that depends on the adjustment of the operator in place. There are many touch-pressure sticks that are not what everyone says, so there must be evidence when choosing a touch-pressure stick. Follow.

The amount of paste can not be too large, so as not to cause the peak deformation, please remember that in many cases it is not that the greater the amount of glue fit better, must pay attention to the paste formula and production process.

â–  Bonding machine

Dirty (garbage)

Generally hot plates and canvas belts are easily formed. On the hot plate, clean the hot plate every time you change the width of the door, avoid the paper plate and then stop the cleaning. Compared to cleaning the production gap, you will waste more energy and financial resources. On the canvas belt, it should be cleaned regularly every day, and the canvas belts should be cleaned thoroughly every week. Generally, the canvas belt is used for bubbling for a period of time to be softened, and then cleaned with a wire brush. Do not save time in order to save time. As a result, after accumulating to a certain extent, more time is lost for cleaning.

In order to produce good quality products, the air permeability of the canvas belt is better. After a certain period of time has passed, it must be replaced. It is not because of the temporary cost savings that the cardboard produced is warped.

Pressure roller

The number of pressure rollers used

Must use a reasonable amount of pressure roller (in different seasons, the number of pressure roller used is not the same, according to the actual situation in a timely manner);

Each pressure roller must be uniform, and the radial and axial directions must be controlled within 2 wires. Otherwise, the thickness of the pressure roller will be insufficient because of the elliptic shape of the pressure roller.

The gap between the pressure roller and the hot plate must be adjusted to leave a fine-tuned space, which can be adjusted according to the shape (height) of the corrugation. Domestic corrugated board machines may not have this capability at present, but as long as the control and adjustment are obtained, such problems can still be solved;

It is recommended that carton manufacturers use hot platens instead of pressure rollers, provided of course that our operating level must reach the level of automation equipment used.

â–  Afterwards

Cross cutters must use a reasonable sun gear at the entrance and exit. Generally, they are tested at 5 to 60 degrees with a Shore hardness tester to avoid crushing the cardboard.

(Author / Xu Wuhai) "Corrugated Carton" July 2005 issue