Introduction of paper making machinery

Paper machines include long wire multi cylinder paper machines,circular wire paper machines,etc.The types of paper machines used vary depending on the paper product

The following are the categories of paper processing machinery:tissue paper machine,napkin paper machine,toilet paper rewinder,disc paper slitting machine,mini tissue paper machine,band saw cutting machine,toilet paper machine,handkerchief paper machine,disc paper slitting machine,extraction machine,newsprint machine,corrugated paper machine,copy paper machine,coated paper machine,and white cardboard machine

In recent years,the new technological equipment that has emerged in the world include:

1.Cooking technology and equipment

At present,the international cooking processes and equipment include Norway's improved continuous digester and isothermal digester.Their characteristic is that the Kappa number of the cooked pulp is low(up to 25),but it does not reduce the strength of the pulp.In terms of intermittent cooking,cold spraying technology is more prominent.Its characteristics are low energy consumption,high pulp yield,and significantly increased cooking capacity compared to traditional methods

From the perspective of development,cooking technology will expand and improve sulfate cooking,develop and apply deep cooking technology,reduce the Kappa number of coarse pulp,reduce energy consumption,and reduce pollution.Sulfur free pulping will also be a direction for future development

2.Bleaching technology and equipment

In recent years,the new technology adopted in the world is chlorine free bleaching technology(ECF technology for short),and has gradually started to apply chlorine free bleaching technology(TCF technology for short).Compared with traditional methods,these two bleaching methods have the advantage of greatly reducing environmental pollution.Traditional chlorine containing bleaching has an AOX content of 2.4kg/ton pulp in the wastewater,while using ECF and TCF technologies results in an AOX content of 0.6kg/ton pulp and 0.2kg/ton pulp,respectively

In addition,using ozone,hydrogen peroxide,and biological enzymes as bleaching agents to treat pulp will also be the development direction of bleaching technology in the future

3.Paper making technology and equipment

At present,the methods adopted in the world are full flow hydraulic headbox equipped with pinch net shaper and pressure sizing round net shaper.The principle of fluid mechanics is used to disperse fibers,and the principle of double-sided dehydration is used to solve the problems of high-speed forming and paper page difference;Using multi-layer forming layout to produce thin sheet paper.In terms of pressing,new technologies commonly used to improve dehydration efficiency,improve the difference between two sides,curliness,and surface strength of paper include high line pressing,double-sided pressing,new transfer pressing,composite pressing,and wide press zone pressing.The new paper and cardboard machines all adopt fully enclosed hoods,dry nets,and bag ventilation devices;High end paper machines use new methods such as air cushion drying

4.Coating Technology and Equipment

The development of coating technology includes the development of new coatings,research on coating preparation technology and equipment.Applicators tend to adapt to multi-functional forms of high-speed production,tight coating,and wide coating range.The emerging form of dryer has attracted industry attention due to its high thermal efficiency.New coating machines include Sweden's Twin–HSM Roll Coater and ABC Coater,etc.Its characteristic is that the coating amount is easy to adjust and the range of coating amount is large