Improvements in the Manufacture of Moulded Articles.
Year: 1894

page_text: Date of Application, 6th Sept., 1894
Complete Specification Left, 6th June, 1895--Accepted, 29th July, 1895
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Moulded Articles.
J, FREDERICK WEAVER OLIVER, of 259 Burdett Road, Limehouse, in the
County of Middlesex, do hereby declare the nature of this invention to be as
follows:-
According to this invention an absorbent material, such as paper, dry paper
pulp, sawdust, or the like, is impregnated with liquid celluloid and the resulting
paste is forced through heated dies or into a heated mould open at one end.
The spirit used in dissolving the celluloid is driven off by the heat and the material
sets in the desired form.
This method is very suitable to the manufacture of cartridge cases. For bottle
nozed cartridges the material is forced through an aunular die into a mould corre-
sponding to the external form of the cartridge and having within it a conical core.
The cartridge case is removed from the mould before it has quite set and the
bullet is placed in its end and the material in settling shrinks and firmly holds the
bullet.
Dated this 5th day of September 1894
F. W. OLIVER.
Improvements in the Manufacture of Moulded Articles.
I, FREDERICK WEAVER OLIVER, of 259 Burdett Road, Limehouse in the
County of Middlesex, do hereby declare the nature of this invention and in what
manner the same is to be performed to be particularly described and ascertained in
and by the following statement :-
According to this invention an absorbent material, such as paper, dry paper pulp,
sawdust wood fibre, or the like, is impregnated with liquid celluloid and the resulting
paste is forced through heated dies or into a heated mould with a vent hole.
The spirit used in dissolving the celluloid is driven off by the heat and the material
sets in the desired form.
Preferably however the mixture is first dried by evaporation of the spirit or
other solvent till it forms a firm material when cold, but is plastic when heated.
This plastic substance is placed in or forced into dies of suitable shape heated to
about 212° and moulded therein by pressure to any desired form.
The more the material is dried before moulding, the greater should be the heat
applied to render it plastic, but it should not exceed 350° F.
This method is very suitable to the manufacture of cartridge cases. For bottle
nused cartridges the material is forced through an annular die into a mould corre-
sponding to the external form of the cartridge and having within it a conical core.
The cartridge case is removed from the mould before it has quite set and the
bullet is placed in its end and the material in settling shrinks and firmly holds the
bullet.
The proportions of the materials may be varied considerably but for most purposes
a mixture of wood fibre and celluloid in the proportion of one to two by weight is
suitable.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
The manufacture of moulded articles from an absorbent material impregnated
with liquid celluloid substantially as described.
Dated this Fifth day of June 1895.
F. W. OLIVER.