US1945686A - Process for producing wall papers from peeled wood veneers - Google Patents

Description

Patented Feb. 6, 1934 PATENT OFFICE PROCESS FORQPRODUCING WALL PAPERS FROM PEELED WOOD VENEERS Heinrich Albert Hellmers, Kiel, Germany No Drawing. Application January 31, 1933, Serial No. 654,547, and in Germany May 11,

3 Claims.

This invention relates to a process for producing wall papers from peeled wood veneers incombination with fibrous substances, paper cellulose fabrics, cotton materials or any other kinds of I fabric, stuck to the rear side of the veneers.

In the manufacture of veneer wall papers when it was not endeavoured to cause a better adhesion of the layers by mechanically working the rear side of the veneer or embedding a first layer of i veneer between two paper webs, the tree trunk was hitherto stuck to the paper web or the like anterior of the peeling knife, or the veneer was united to the web directly after the peeling operation, that is whilst still in wet condition. It has been endeavoured to employ plywood plates and the veneers herefor in a large variety of shapes for the manufacture of wooden wall papers, without taking into consideration the fact that the expansion co'efficient of the wood veneer, which also varies in different kinds of wood, is another one than that of the web stuck on the back of the veneer. Wall papers thus produced evidently have a great tendency to roll and consequently, if stored for a long while, become brittle. The employment of viscous glue or other adhesive substance to which formaldehyde is added in order to unite the veneer to the web to be stuck on its rear side is of no avail because, as mentioned above, the expansion coeflicients have not been so taken into consideration.

. The novelty of the invention consists in that, after the tree trunks have been peeled in known manner orita peeling machine to form veneers,

these veneers are cut: into strips of a certain width.

so that above all the internal stresses in the veneers are as far as possible removed. These veneers, the cells of which have been-opened during the peeling operation, are then steeped in different baths for 24 hours or more according to the 40, kind of wood being worked. These solutions consist'of 15 parts by weight of cellulose acetate, 10 parts-of 14% chrome alum, 5 parts of formaldehyde and 70 parts of water. After a partial drying, the veneers are then placed in a bath consisting of 30 parts of 25% glycerine and 25 parts of gelatine to which 45 parts of water have been added.

By this intensive steeping in .the above mentioned baths all subsequent working of the wood is rendered unnecessary. After the veneer webs have been dried, they are stored and then the paper, fabric, or fibrous material or the like is stuck to the rear side of the veneers according to their purpose of use.

For producing colored wall papers, the peeled webs after the drying and storing process are dyed by a device with cylindrical brushes rotating in both directions. In this dyeing machine fitted ith cylindrical brushes rotating in both directions the dye is rubbed'into the cells of the wood in both directions. After the dyeing the veneer webs are subjected to a further dyeing or storage ,process and then the paper or the like is stuck on .70 to their rear side.

I claim:--

1. A process for producing wall papers from peeled wood veneers in combination with a backing of fibrous substances, paper'cellulose fabrics, cotton materials and fabrics of all kinds stuck on to the rear side of the veneers, consisting in cutting the peeled wood veneers into strips of a oer-- tain width, in subjecting the veneer strips to a drying process by storage, in steeping the stored so veneer strips in an aqueous solution of cellulose acetate and chrome alum, in again drying the steeped veneers, in steeping the dried veneers in an aqueous solution of glycerine and gelatine, in again subjecting the veneers to a dryin process by storage, and finally in sticking the backing on the dried veneers.

2. A process as specified in claim 1, in which the first aqueous solution in whichthe veneers are steeped consists of 15 parts of cellulose acetate, 10 parts of 14% chrome alum and70 parts of water, and the second bath employed for steeping the veneer consists of 30 parts of 25% glycerine, 25' parts of gelatine and 45 parts of water.

3. A process as specified in claim 1, consisting in dyeing the veneers after the final drying and storage process, and in subjecting the dyed veneers to a further drying and storage process before sticking the backing on to the rear side of the veneers.

H. ALBERT HILLMERS.