Bladder devices for moving components of web packaging machines
A bladder device is for moving a component of a web packaging machine that forms and encloses a food product in a food product package made of webs of packaging material. The bladder device has a bladder and a nipple stub coupled to the bladder and having a first end configured to receive a gas and a second end configured to dispense the gas into the bladder to thereby inflate the bladder and move the component of the web packaging machine. A collar coupled to the nipple stub such that the bladder is sandwiched between the collar and the second end of the nipple stub. The second end of the nipple stub has a depression and the collar has a boss that is oriented towards the depression such that tightening the collar on the nipple stub forces the bladder into the depression and thereby forms a fluid tight seal.
1. A bladder device for moving a component of a web packaging machine, the web packaging machine being configured to enclose a food product in a food product package made of lower and upper webs of packaging material, the bladder device comprising:
a bladder having a sidewall;
a nipple stub coupled to the bladder and having a first end configured to receive a gas and an opposite, second end configured to dispense the gas into the bladder to thereby inflate the bladder and move the component of the web packaging machine, wherein the nipple stub has a bore that extends between the first end and the second end and through which the gas is conveyed, and wherein the second end has a nipple stub flange with a plurality of grooves formed therein such that each groove in the plurality of grooves radially extends from the bore to an outer perimeter edge of the nipple stub flange to thereby form fluid flow paths along which the gas is conveyed; and
a collar coupled to the nipple stub, wherein the sidewall of the bladder is sandwiched between the collar and the second end of the nipple stub, and wherein one of the second end of the nipple stub and the collar has a depression and the other of the second end of the nipple stub and the collar has a boss that is oriented towards the depression such that tightening the collar on the nipple stub forces the sidewall of the bladder into the depression and thereby forms a fluid tight seal;
wherein one of the nipple stub and the collar has a first sloped surface at a first side of the depression and an opposite second sloped surface at a second side of the depression; and
wherein the other of the nipple stub and the collar has a first sloped surface at a first side of the boss that corresponds to the first sloped surface at the first side of the depression such that the boss fits within the depression.
2. The bladder device according to claim 1 , wherein the depression is an annular depression and wherein the boss is an annular boss that is sized to fit in the annular depression.
3. The bladder device according to claim 2 , wherein the collar is coupled to the nipple stub via a threaded connection.
4. The bladder device according to claim 3 , wherein the collar comprises a collar flange, and wherein the sidewall is sandwiched between the nipple stub flange and the collar flange when the collar is tightened onto the nipple stub.
5. The bladder device according to claim 4 , wherein the nipple stub flange has a first radius, and wherein the collar flange has a smaller, second radius.
6. The bladder device according to claim 5 , wherein the annular depression extends to the outer perimeter edge.
7. The bladder device according to claim 4 , wherein the bladder defines an interior space, and wherein the sidewall defines an opening through which the gas passes into the interior space.