Q1: Is there Whiteness Variation?
For environmentally friendly reasons all stone paper products are 100% free from bleach. As bleach or optical brighteners are not added, this means that slight
variation in the whiteness between different thicknesses and batches can occur. This is normal.
Q2: What is Rubbing Resistance Rubbing Effect?
Via normal offset printing methods, rubbing the printed matter against the paper itself may result in color offsets. This is normal.
Special ink Overgloss, sealing, aqueous coating or extra converting procedures (e.g.film laminating) can be performed to reduce or eliminate this.
Q3: What is the Accepted Thickness Variation?
SPN: thickness variation of up to ± 5 microns.
RBD: thickness variation of up to ± 6 microns.
Particularly when printing solid colors, color differences may be visible due to the thickness variations. However, with continued quality development, these normal
variations are expected to reduce.It is expected that thickness variation will further reduce to 3-4 micron with the commissioning of new and enhanced paper
Q4: Is Set-Off a Problem?
Stone Paper can be treated much like usual paper stocks. Especially with boards, it is recommended to use small stacks or racking in the delivery especially when
large solids are printed. Anti-Offset Spray Powder can be used as per normal. If the press has Infra Red Drying Units (IR) then these should be turned off at the tail
end of the sheet may curl or distort with heat, especially with stone papers. Another benefit is that power usage is reduced.
Q5: Is Stone Paperless Opaque?
Due to inherently different materials, compared to pulp paper, the stone paper is generally more transparent although a new coater recently has considerably improved
opacity to 88%.
The manufacturing process of stone synthetic paper by thin film method
Synthetic paper of the internal will first mix the synthetic resin and filler, and add the appropriate additive, such as stabilizer and dispersing agent. After fully mixed, the extruder is packed to melt mixing. The molten material is then extruded from the seam of the T-Mold head to form a film. There are usually two kinds of film-forming methods used in the process of synthetic stone paper. Non-stretch thin film forming method and biaxial stretching film forming method.
Because of the continuous production line, the production cost is lower. Whether it's thick or thin, all are three layers. The filling content of the middle ground level is lower than that of the two layers, so it is more closely related to the properties of plastic. The strength and stiffness of synthetic paper were improved after using longitudinal and lateral tensile orientation by bidirectional stretch thin film forming method. At the same time, due to the high content of packing, the two layers formed a large number of fine pores in the stretching process. Because of this large amount of fine pores, it scatters the light and increases whiteness, opacity, printing and writing, even being endowed with the properties of paper. In addition, because the density is small and the gram is low, the unit of material consumption is low.
Synthetic stone paper of surface paper method takes synthetic resin film as base material, carrying on chemical treatment, physical treatment, or surface coating treatment on its surface and then making synthetic resin film paper.
The manufacturing technology of fiber synthesis paper
Spinning and sticking-type synthetic stone paper. The so-called spunbonded method is to spray raw materials through numerous nozzles on the yarn edges to form fiber net, then impregnate the fiber net with resin, and also can use the mechanical method to connect the fibers to make spunbonded synthetic paper. This method is highly productive.