Improve corrugated cardboard gluing:

At present, there are many companies in China that have the problem of poor efficiency in producing four-layer paperboard, which is mainly manifested in poor adhesion, which results in the inability to increase the speed, and it can only be opened slowly enough to achieve cohesion. corrugated cardboard production line

8.1. Reason analysis:

Because there is no paper in the pit, the thermal conductivity of the paperboard is poor, and the moisture is not good enough to control. At a certain speed, the required temperature for bonding cannot be achieved, and the temperature required for bonding can only be met by reducing the vehicle speed. corrugated cardboard production line

8.2. Solution: corrugated cardboard production line

8.2.1, install the spray device, through the replenishment of water can quickly increase the temperature of the board in contact with very little water, rapid penetration, to achieve

Adhesion requirements; (The main reason is that the amount of water in the lower layer is not recommended. The main reason is that it is impossible to control the amount of water applied. When the amount of water applied is large, the drying path will cause dirt to crush and part of the corrugation will cause bubbles to affect the surface. quality)corrugated cardboard production line

8.2.2. Controlling the amount of overpass accumulation, when the cardboard bridges are piled up a lot, it means that they will stay on the flyover for a longer period of time.

The moisture and temperature of the paperboard will change and decline with the length of time, resulting in a certain increase in the probability of poor adhesion, so it is necessary to control the amount of flyovers as much as possible, especially when high materials are used.

corrugated cardboard production line

8.2.3, depending on the configuration of the paper to change the glue formula, the powder ratio of water control in 1/3, the viscosity can be increased to 25 seconds, the gelatinization temperature can be moderately reduced to 56 degrees / 57 degrees depending on the ambient temperature, see the weather humidity Appropriately increase the content of borax, increase initial tack, bridging agent and stable dose (this formula is a one-step method for making glue).corrugated cardboard production line

8.2.4. By changing the paper-feeding method to control the feed temperature, it is necessary to change the direction of the paper to go through the uppermost layer of paperboard. On the double-sided machine side, it is not the paper side but the side of the pit. The best effect is to use the preheating cylinder that is on the front side, that is, on the top of the rubber roller. corrugated cardboard production line

Tightness is the degree of measuring the density of the paper structure, if the tightness is too large, the paper is easy to embrittlement, opacity and absorb ink drop, print marks are not easy to dry, and easy to produce a dirty dirty phenomenon. Therefore, the tightness of the paper printing will significantly control the amount of ink applied, and select the ink corresponding to the dryness.corrugated cardboard production line

Recommended Instruments: Paper and Card Thickness Gauges

The main technical parameters:

Measuring range: paper and cardboard (0~4)mm, graduation value 0.01mm

Or corrugated cardboard (0~18) mm, dividing value 0.1mm

Paper and cardboard thickness gauges:

corrugated cardboard production line

Corrugated packaging inspection

Section I, Inspection of Base Paper

Physical properties

Quantitative determination (GBT451.2-2002 “Determination of quantification of paper and board”)

Quantification is one of the most basic performance indicators of paper. Quantification is often regarded as a characteristic parameter of paper because most paper is sold on a weight basis. The so-called “quantitative” is the “mass per unit area of ​​paper and board measured according to the specified test method. The unit is g/mP.”

The method for determining the amount of anaesthesia is: 10 sheets of 100 cm2 paper to be tested are weighed using an analytical balance, and the weighed mass is multiplied by 10 to obtain the gram weight per square meter. corrugated cardboard production line

The accuracy of the quantitative determination directly affects the determination of the crack length, tightness, and tensile index, and should not be overlooked. The accuracy of quantitative determination is related to the area accuracy of the tested sample and the accuracy of the weighing device. The standard of the test method has strict requirements for the sample cutting device and the weighing instrument. The key point is the sampling accuracy of the quantitative sampler. Because the fiber of the corrugated medium is relatively thick, it is recommended to use a stamped circular volumetric sampler. corrugated cardboard production line

The recommended instrument is:

Sample area: 100cm2 :

Quantitative sample samplercorrugated cardboard production line

1.2 “Determination of Paper and Board Thickness”

Thickness and tightness (GB451-3-2002)

Since some basic properties and strength properties of paper are related to thickness, it is

Thickness is one of the basic performance parameters of paper.

The unit is u m or mm.

The thickness inspection must be carried out under the specified conditions. The paper thickness inspection instrument must meet three basic requirements for detecting the contact area of ​the paper, the contact pressure and the detection of the falling speed, otherwise the result is inaccurate. corrugated cardboard production line

Tightness refers to the weight per cubic centimeter of paper. corrugated cardboard production line

The tightness of the paper is calculated from the quantitative and thickness according to the following formula:

D=G/(d x 1000): G: indicates paper weight g/m2, d: paper thickness in mm