Abstract The invention relates to a grinding apparatus of the type having grinding discs arranged in a housing of which at least one is rotatable and which between themselves form a grinding space for the grinding produce such as wooden chips fed dispersed in an aqueous vehicle to the centre of the space to be forced therethrough in outward direction under strong axial grinding pressure. Under this procedure the temperature of the vehicle is increased which results in evaporation of water which in turn unfavourably affects the produce such as the wooden chips the fibres of which may be locally overheated and miscoloured. To counteract this evaporation of water, ducts are formed in the grinding discs, at least the stationary one for supply of water to the grinding space between the discs. This arrangement is particularly useful when the grinding discs are composed of concentrical elements defining an outwardly decreasing grinding space permitting a highly advanced desintegration of the starting material.
Inventors
👤 R Reinhall
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-01 23:46
CPC Classifications
D; D21; D21D; D21D1/00; D21D1/20; D21D1/30
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
133 words
A grinding apparatus comprising: a. a housing; b. a pair of grinding discs arranged within said housing defining between them a grinding space for defibering and refining vegetable material and similar produce; c. at least one of said grinding discs being stationary and comprising a plurality concentrically arranged disc segments and holder members for said segments; d. said segments being spaced from one another in a radial direction to provide ducts extending substantially axially therethrough, and; e. means for supplying liquid to said stationary disc and to said grinding space during the grinding operation comprising: i. a plurality of passages in said holder members and; ii. a plurality of radially spaced annular channels defined between said holder members and said disc segments adapted to supply liquid to said grinding space through said ducts.
Claim 2
Dependent Claim
133 words
A grinding apparatus comprising: a. a housing; b. a pair of grinding discs arranged within said housing defining between them a grinding space for defibering and refining vegetable material and similar produce; c. at least one of said grinding discs being stationary and comprising a plurality concentrically arranged disc segments and holder members for said segments; d. said segments being spaced from one another in a radial direction to provide ducts extending substantially axially therethrough, and; e. means for supplying liquid to said stationary disc and to said grinding space during the grinding operation comprising: i. a plurality of passages in said holder members and; ii. a plurality of radially spaced annular channels defined between said holder members and said disc segments adapted to supply liquid to said grinding space through said ducts.
Claim 3
Dependent Claim
40 words
A grinding apparatus according to claim 1 in which the vegetable produce is fed centrally through said stationary disc and said disc segments form separate zones in said grinding space successively decreasing in width towards the periphery of the discs.
Claim 4
Dependent Claim
15 words
A grinding apparatus according to claim 2 in which said holder members are axially adjustable.