DE17789C - Production of tracing paper and tracing linen, as well as transparent packing paper - Google Patents

Description

IMPERIAL

PATENT OFFICE

CLASS BB: Paper manufacture.

Since then common methods of the production of tracing paper are based on the paper pores to be filled with a resin that has previously been dissolved in volatile solvents. Man uses canada balsam, dammar and gum resins of all kinds for this purpose.

These are the usual ones used in tracing paper production Substances. The resins, however, have the disadvantage that they become brittle with time and become less transparent.

Another method is to add solid fatty substances in order to make the paper tougher or more transparent; but this is again connected with the problem that the paper takes on more difficult colors and inks.

Another method is to wash the paper with poppy seed oil or other firnif oils is soaked. Besides being expensive, such oils are also greasier Nature, and the papers treated with it, are suitable for painting with OeI, but not with Watercolors.

Oelfirnifs mixed with gasoline and cooked are also used. This would proceed be very similar to mine to be described here, if these are the only ones in use coming substances would be. Cooking the varnish and mixing it up with gasoline, however, is done for an essentially different purpose, for it becomes lead oxide added and the boiling has only the purpose of adding the lead oxide to the Oelfirnifs combine to form lead soap. The gasoline has the purpose of making the mass liquid get while it cooks and the connection goes on. The lead soap obtained is then pressed into the paper. Just like ordinary soap, very substantially different if it is of the fat from which it was partly made, this too is soaped paper (which used gasoline to keep the soap runny while it is in the paper is very different from paper made with drying oil and then cleaned with gasoline to remove non-drying oils. This is paper stiff, hard and very transparent.

Another method is to use oils and resins at the same time; it is unnecessary to go into this further. Finally there are also methods by which one can at the same time Bringing resin and soap into use. The papers produced in the latter way can be how all soaped papers stretch out, whereupon they contract again; they will also, as soon as they become damp, more difficult to see through. In short, until now it has always been either a brittle resin paper, a grease paper that does not accept watercolors, or with help an expensive soap paper made by warmth.

At the present time, trawling lines are generally made in such a way that they can be pulled by strong pressure Forcing substances soluble in water into the pores of the canvas, a costly process and bad insofar as one does not use watercolors or water to nafs such trailing linen may do without thereby making it consistent and smooth. Structur loses.

In relation to all these papers, mine offers according to the procedure described in the following

tracing paper has the advantage that it is tougher and cheaper and that it is also Oil colors, inks and watercolors "and printed like ordinary paper can.

My procedure is as follows:

ι. The paper is treated with an OeI, such as B. boiled linseed oil, which is converted into such a state by boiling that Like linseed oil, it becomes solid and not greasy when it cools.

2. This change of state of the oil, as well as the evaporation of all remaining oily constituents, is conveyed by adding a volatile solvent to the cooked linseed oil, such as. B. of gasoline, which at his Evaporation carries all of the really oily ingredients with it. It is, however, quite irrelevant whether the gasoline is mixed with the drying oil; it then does the job just as well as if the one treated with the cooked oil and already partially dried Paper is washed with gasoline or some other volatile solvent. Main purpose The only thing of using gasoline is that it takes away the non-drying oils with it. In large factories the gasoline vapors can be captured and condensed for later use will; If the recovered gasoline contains a lot of oily admixtures, one can distill it carefully.

. 3. The paper produced in this way is washed in an aqueous chlorine solution which, if it is to be used for thin papers, for example 1 part of a saturated chlorine solution contains 1 part water for 7 parts of water or for stronger papers 1 part of solution; next, before the paper has become dry again, the washing is carried out with hydrogen peroxide repeated. The chlorine renders the paper odorless and tasteless, and the hydrogen peroxide causes the paper to lose its quality Smell of chlorine, it is bleached and its washing is completed.

In small-scale manufacture I mix boiled linseed oil and gasoline, and I mix it up, depending on whether I want to speed up the production or one more or to obtain less perfect degreasing of the paper, any particular one Number of parts by weight of the gasoline with the total amount of linseed oil.

I apply an oil prepared in this way to it by means of a brush or a sponge Paper on; but you can also use rollers to suck up the oil, transferred to the paper.

When I fabricate trailing linen, I add starch or glue to the linen and coat it then each side with linseed oil and gasoline; when the canvas is dry, I pull it by polished, appropriately heated gloss rollers.

The paper or linen produced by the method described above can also be used for Manufacture of bags and generally used for packaging purposes; the same thing is suitable for storing nutrients, chemicals, tobacco and so on Paper made in this way is waterproof and translucent, two properties it has for that make the mentioned purposes useful.

Claims (2)

Patent Claims: 1. The process of making transparent paper, consisting in the combination the operations listed under 1. to 3. above. 2. The process of making transparent canvas, consisting in pretreatment of the fabric with starch or glue, then coated on both sides with linseed oil and Gasoline and perfection between heated polishing rollers.