Share News Channel

12 important indicators for corrugated cardboard production line operation

2024-10-12 15:23320

In the process management of carton companies, standardization is one of the important tools. It is very important and necessary for carton companies to pay attention to and strengthen process standardization. Process standardization is an important step for carton companies to achieve standardization, and the standardized control of each process link in the carton production process is an important part of process standardization.

  How is your factory doing in the assessment of twelve important indicators for corrugated cardboard production line operations?

 

  Adhesive index

 

  The viscosity and solid content of adhesives for corrugated cardboard should be adjusted according to the season.

 

  Usually, at low temperature and low humidity (winter), the viscosity of the adhesive for single corrugated cardboard is 17 to 21 seconds (apply 4 cups, the same below) and the solid content is 17% to 19%; the viscosity of the adhesive for three corrugated cardboard is 40 to 40 seconds. 60s, solid content is 18%~20%.

 

  In high temperature and high humidity (summer), the adhesive viscosity for single-corrugated cardboard is 20-25s and the solid content is 19%-22%; the adhesive for three-corrugated cardboard has a viscosity of 55-90s and a solid content of 21%-25%. %.

 

  In addition, the adhesive pulling length should be ensured (dip a little adhesive with your thumb, bond it with your index finger, and slowly pull the two fingers apart until the distance between the two fingers when the adhesive breaks) is 15 to 20 mm.

 

  base paper index

 

  (1) Moisture content of base paper. The moisture content of the base paper should be 6% to 8%, which is most beneficial to the bonding and corrugated forming effects of corrugated board. The difference in moisture content between the three types of base paper and the left, middle and right sides of each base paper shall not exceed 3%.

 

  (2) base paper production time. The production dates of the three base papers must be similar before they can be used on the machine.

 

  (3) The number of times the base paper can withstand folding. The base paper should be produced in a low-temperature and low-humidity environment. In order to prevent the carton from bursting due to its low folding endurance, the base paper must have a folding endurance of more than 50 times.

 

  (4) base paper strength. The strength of the base paper is determined based on the customer's compression requirements for the corrugated carton used and the production process of the carton. For example, if the compressive strength of a certain box-type carton is required to reach 1500N, through analysis and calculation, if offset printing is used to print the carton, the base paper should be high-strength A grade, the basis weight is 120g/m2, and the ring pressure index is greater than 7N·m/g; if watermarking is used Or for pre-printed cartons, the base paper should be high-strength grade A, with a basis weight of 110g/m2 and a ring pressure index greater than 6N·m/g.

 

  The selection of base paper strength is relatively complex and must be determined after analysis, calculation, and testing based on relevant technologies. once determined, the base paper must not be replaced for this type of box, and the base paper with the specified corresponding strength must be selected during production.

 

  Original paper force adjustment

 

  The original paper force should be adjusted according to the longitudinal bending degree and usage conditions of the corrugated cardboard.

 

  When the corrugated cardboard is bent in the longitudinal direction of a certain base paper, the tension of this base paper should be released. The tension control of the core of the original paper roll and the outside of the roll are different. The tension parameters of the original paper must be reduced at the core to prevent the paper from breaking. Excessive force on the base paper can easily cause quality problems such as paper breaks, longitudinal bending of the corrugated board, and unsatisfactory corrugated molding effects. On the contrary, it can easily cause bubbling and warping of the corrugated board.

 

  Preheat corner wrapping

 

  The surface temperature of the preheating roller must reach above 100°C, and the temperature of the hot plate must reach above 150°C.

 

  The size of the preheating wrap angle is proportional to the contact area of the base paper on the preheating roller and the moisture content of the base paper. During the production process, the preheating wrap angle can be increased or decreased according to the transverse bending degree of the corrugated board. For example, when single-corrugated cardboard and three-corrugated cardboard are bent transversely, in which direction the base paper is bent, the preheating wrapping angle of the base paper will be increased and the preheating wrapping angle of other base papers will be reduced.

 

  Paper stack adjustment

 

  Although stacking paper at the bridge helps evaporate moisture from corrugated cardboard, excessive stacking of paper will cause phenomena such as washboarding and bending of corrugated cardboard. Therefore, the amount of paper stacking must be reasonably controlled based on the board output effect.

 

  Dust removal system

 

  When producing three-corrugated cardboard, the cleanliness of the cardboard should be ensured. Use the dust removal system of the corrugated cardboard production line, use brushes to remove dust, and turn on the air suction device to reduce printing quality problems caused by paper wool in the subsequent printing process.

 

  Steam pressure and hot platen control

 

  Ensure that the minimum vapor pressure is greater than 7kg and the internal temperature of the hot plate reaches 150°C before production can be started. In actual production, the hot pressing plate is reasonably adjusted according to the bending degree of the corrugated cardboard and the speed of the machine.

 

  When the corrugated cardboard bends laterally in the direction of the box board, the latter set of hot press plates should be lifted to ensure that the glue gelatinizes and the internal temperature of the hot press plates is lowered. When producing corrugated cardboard with a longitudinal dimension less than 600mm, the machine speed should be reduced by 30% to 40%, the last set of hot press plate steam pressure devices should be closed or raised, and the hot press plate should be raised at the same time to dissipate heat.

 

  For pre-printed cardboard, in order to achieve no quality problems during production at 150°C, the pre-printed surface paper should use high-temperature resistant varnish. once it is found that the pre-printed surface paper has ink and varnish lamination at this high temperature, the heat-resistant varnish should be removed. The platen temperature is lowered to 130°C for production again.


Favorite 0
Comment 0
Minimum wage standards in 31 provinces announced, 25 places ≥2,000 yuan
Recently, the official website of the Ministry of Human Resources and Social Security released the minimum wage standards for all provinces, autonomous regions, and municipalities across the country (

02024-10-2125

The silver ten market is finally here? Price increase letters for packaging paper and yarn tube pape
The market prices of containerboard and corrugated paper rose significantly last week, and mainstream paper companies have implemented price increase strategies, with price increases ranging from 30 t

02024-10-2123

Notice on holding the 21st Beijing Printing Industry Vocational Skills Competition
All district press and publication bureaus, district human resources and social security bureaus, Beijing Economic and Technological Development Zone Social Affairs Bureau, Beijing printing enterprise

02024-10-2125

The 2024 Equipment Manufacturing Development Conference will be held soon
The press briefing of the 2024 Equipment Manufacturing Development Conference was held in Beijing on the 16th. Luo Junjie, executive vice president and spokesman of the China Machinery Industry Federa

02024-10-2125

Let high-temperature oily food products "wear" green packaging Meituan Qingshan plans to r
On October 15, Meituan Qingshan Plan, China Packaging Federation, China Environmental Protection Foundation and others jointly launched the industry's first green packaging digital platform for ca

02024-10-2126

Hebei Province has announced a new list of specialized and new small and medium-sized enterprises, a
According to the relevant provisions and annual work arrangements of the Implementation Rules for the Gradient Cultivation and Management of High-Quality Small and Medium-sized Enterprises in Hebei Pr

02024-10-2121

The 20th Cross-Strait Book Fair was held in Taiwan
The 20th Cross-Strait Book Fair (hereinafter referred to as the Nautical Chart Fair) opened in Taipei on the 15th. With the theme of Books on both sides of the Taiwan Strait, love for China, the event

02024-10-2128

Shanxi will implement the "New Eighth Level Workers" vocational skill level sequence
 It was learned from the Shanxi Provincial Department of Human Resources and Social Security that the Action Plan on Strengthening the Construction of High-Skilled Talent Team in the New Era (hereina

02024-10-2126

The digitalization rate of production equipment of Yunnan manufacturing enterprises reaches 47%
On October 14, reporters learned from the 55th World Standards Day press conference that Yunnan Province strengthens standards leadership to promote high-quality leap-forward development. Since the 14

02024-10-2125

Classification of black cardboard and related product introduction
Black cardboard is a kind of thick paper with a large weight. The reason why it is called black cardboard is because dye is added to the original pulp paper during beating, so that the entire paper be

02024-10-1231