Device and machine for making filter bags of tetrahedral shape
AssigneeI.M.A. Industria Macchine Automatiche S.P.A.
InventorsAndrea Sermenghi, Sauro Rivola
Life of this patent
Estimating the term…
Abstract
A forming tube for making filter bags of tetrahedral shape for infusion products including a forming element, which is elongate and hollow, which defines a longitudinal axis and which has a first opening through which the product enters in the forming element, a second opening through which the product leaves from the forming element to be dosed inside a filter bag being formed, and an inner through cavity which connects the first opening to the second opening and inside of which flows the infusion product. The forming element includes a main body substantially tubular including the first opening and a forming end including the second opening and mobile in rotation with respect to the main body about the longitudinal axis.
Claims12
A machine for forming filter bags of tetrahedral shape containing infusion product, the machine comprising:
- a forming and joining station to form a continuous strip of filter material and create a continuous tube of filter material, the forming and joining station comprising:
- i) a forming tube configured to be wound by the continuous strip of filter material moving along a feed direction, the forming tube comprising a hollow forming element extended along a longitudinal axis parallel to the feed direction and having a first opening and a second opening communicating by means of an inner through cavity through which the infusion product entering from the first opening flows to exit from the second opening so as to be dosed inside a filter bag in formation, the forming element comprising a main cylindrical body and a forming member, the forming member having a connecting portion proximal to the main cylindrical body and a forming portion distal from the main cylindrical body, the forming portion being provided with the second opening and having a maximum transversal dimension greater than the maximum transversal dimension of the connecting portion;
- ii) a longitudinal sealing element configured to form a continuous longitudinal seal at a free longitudinal edges of the continuous strip of filter material, in order to form the continuous tube of filter material;
- a feeding station for feeding the infusion product inside the inner through cavity;
- a sealing station comprising transversal sealing elements configured to make transversal seals on the continuous tube of filter material, the transversal seals being alternately rotated by 90° on a plane perpendicular to the longitudinal axis,
- wherein the forming member is rotatable joined to the main cylindrical body to rotate about the longitudinal axis, and wherein the connecting portion of the forming member has a transversal cross section which is circular relative to a plane transversal to the longitudinal axis and the forming portion of the forming member has a transversal cross section which is elongate relative to a plane transversal to the longitudinal axis.
Dependencies are inferred from the claim text.