Piercing nozzle with retention feature

A material dispensing system comprising:

• a. a dispensing device having a housing capable of receiving a collapsible tube therein, the collapsible tube having a thin wall and being sealed at a front end and a rear end using a tie clip at each end to contain a viscous material therein;
• b. a compression assembly arranged to compress the collapsible tube;
• c. at least one nozzle attachable to the dispensing device for dispensing the viscous material from the collapsible tube, the nozzle comprising:
• i. an interior surface, a receiving end opening, and a dispensing end opening;
• ii. one or more piercing projections extending from the nozzle interior surface which upon compression of the collapsible tube is configured to pierce the front end of the collapsible tube along a tear line to release the viscous material contained within the collapsible tube and form a flap of the collapsible tube to which the tie clip remains attached;
• and,
• iii. an upstanding wall extending from the nozzle interior surface of the body to define a retention shelf between the upstanding wall and the nozzle interior surface, the retention shelf configured to receive and retain therein the flap and tie clip to enable unobstructed flow of the viscous material through the dispensing end opening.

A nozzle for dispensing a viscous material from a dispensing device, the nozzle comprising:

• a. a nozzle body having an inlet end configured to receive the viscous material from the dispensing device, a cone-shaped sidewall, and an outlet orifice for dispensing the viscous material from the nozzle body, the outlet orifice including a bottom wall and end walls that converge to an apex to form a triangle;
• b. an elliptically-shaped flat wall formed of a section of the cone-shaped sidewall;
• and,
• c. wherein the cone-shaped sidewall and the flat wall converge to form the bottom wall of the outlet orifice.