DE1149603B - Process for the production of a nonwoven-based paper which disintegrates quickly in water and has improved burning properties - Google Patents

Description

The patent 1126 233 describes a process for the production of a writable and printable paper that disintegrates into its constituent parts within a very short time by decomposing fillers and water-soluble binders of the usual type to form the paper base. It is characterized in that a dry fiber fleece is impregnated with an aqueous mixture of fillers and water-soluble binders in such a way that about 40 to 200 parts of binder and an equally large amount of filler are absorbed per 100 parts of fibers, then dried and, after rewetting, up to calendering a moisture content of about 3 to 10% at a temperature between 50 and 200 ⁰ C.

The material produced in this way dissolves into its components after a short time in water, shows but the disadvantage compared to normal paper that it is difficult to burn because of the high organic content Fillers make the combustion of organic components, such as fibers and binders, very difficult.

It has now been found that a water-soluble and very easily combustible or charring Paper can be obtained if the impregnation mixture used in the above process with the Binding agents and fillers, substances that release oxygen and promote combustion, such as saltpetre (Potassium-sodium-ammonium-calcium-nitrate) and / or potassium-sodium-chlorate and perchlorate, sodium perborate and other persalts and / or nitrocelluloses (collodion wool, lacquer wool, gunwool) adds and impregnates a suitable fiber fleece with these substances and dries and that material obtained after remoistening is smoothed by calendering.

Papers of any desired weight from 30 to 150 g / m ^{2 are obtained} and can be written on in a known manner. They dissolve into their components in water and are also particularly easily combustible and charring.

If such a paper is lit, just touching a glowing cigarette is sufficient for this, so the material is completely destroyed by smoldering and charring. The heavier im If the weight is one piece of paper or if there are more individual layers on top of one another (bundle of files), the faster and the burning is more intense. Only the non-flammable fillers remain back in the form of glowing ashes. Any lettering has of course disappeared, and it is impossible even the slightest

Method of manufacture
one that disintegrates quickly in water

Non-woven based paper
with improved burning properties

Addition to patent 1126 233

Applicant:

Carl Freudenberg,
Weinheim (ad Bergstrasse)

Dr. Hans Böe, Augsburg,
has been named as the inventor

to decipher the content of the document afterwards.

example 1

A random fiber fleece made of 100% cellulose fibers with a weight of 20 g / m ² is impregnated with a mixture consisting of:

1.5 parts wetting agent.

The semi-finished material obtained after impregnation and drying, weighing about 45 g / m ² , is smoothed after being moistened to ^{a moisture content of about 5 fl} / o on a heated calender at about 110 ° C.

The result is writing paper (carbon copy paper) which both burns very quickly after lighting or charred and disintegrates into its constituent parts in water.

Example 2

A carded fleece made of 50% rayon, 20% cotton, 30% polyamide fiber with a weight of 30 g / m ²

309 598/258

20 parts Cellulose methyl ether, 30 parts casein 40 parts Nitrocellulose, moist with water, 30 parts Chalk, 10 parts Plaster,

is impregnated with a mixture of the following composition:

20 tea
20 pieces
■ 50 parts
10 parts
10 parts
10 parts

Polyacrylate,

Corn dextrin,

Potassium nitrate,

Chalk,

Plaster,

Titanium dioxide,

1.5 parts wetting agent.

After impregnation and drying, a half material weighing etwä ^T 90 g / m ^2, after wetting "to about-10 Vo moisture content at 12O ⁰ C with increasing pressure is calendered.

The finished paper burns and carbonizes completely, especially in several layers, and dissolves in Water into its constituents.

Example 3

A lengthways carded fleece, consisting of 25% polyester fiber, 25% acetate pulp, 30% cotton, 20% ramie fibers weighing 40 g / m ² is impregnated with a mixture of:

30 parts of water-soluble starch, 30 parts of sodium chlorate, 10 parts of Lithopone, 20 parts of kaolin,
20 parts of chalk
1.5 parts wetting agent.

The soaked and dried semi-finished material with a weight of about 140 g / m ² is calendered and smoothed after being moistened to a moisture content of about 12% at a roller temperature of 90 ° C.

The finished material burns and burns up after ignition in a short time and also dissolves in water into its constituent parts.

Claims (1)

PATENT CLAIM: Process for the production of a writable and printable paper which quickly disintegrates into its components in water and has improved burning properties, by mixing a dry fiber fleece with an aqueous mixture of fillers and water-soluble binders, drying, remoistening and hot calendering according to patent 1126 233, characterized in that that the dry nonwoven fabric also emits oxygen in a manner known per se and promotes combustion, such as potassium-sodium-ammonium-calcium-nitrate and / or potassium-sodium chlorate and perchlorate, sodium perborate and other persalts and / or nitrocelluloses, such as collodion wool, lacquer wool, gunwool, in amounts of 15 to 35, especially 20 to 30% of the finished material weight. Considered publications:
German patent specification No. 211 902.