Paper converters are the people in the middle of everything! They receive paper over which they have little control and they produce converted products and supply many customers that have no way to analyze their products or have facilities that may not be able to handle variances in moisture. Essentially paper products are big sponges that readily absorb moisture or dry out depending upon the environment (the supplier’s mill, intermediary warehousing, trucking and finally their own warehouses. If just one step in this chain is not properly temperature and humidity controlled the moisture content can vary quite a lot. As seasons change incoming paper can go from too dry to too moist. Converting equipment is fine tuned for paper types and basis weights and change in moisture. Moist paper can get thicker jamming machines. Dry paper can become friable and break. Dryer or moisture paper may affect friction and the measuring systems used. Then we get to the converted paper you supply. If going to printers increased moisture can affect the absorption of inks leading to poor absorption and colours or to bleeding or excess ink usage and you get the blame whether it’s your fault or not.
Concreters more than any more need to monitor incoming and outgoing paper. Incoming to control costs and reduce waste in your own production processes and on outgoing products to protect yourselves. You might take the attitude it’s not yours after it leaves your dock, but your clients see it differently and being able to test product before shipping protects you from false claims of substandard products. If you can test at your shipping dock and then get complaints and test at the client’s facility and find moisture is 10-20% higher.