Tamper evident multiple door closure
A server lid for a container with an integral tear strip tamper evident feature. A tear strip for the tamper evident feature is molded as an adjunct to a base member which forms the closure. The tear strip is joined to the base by at least one frangible web, and hinges about the frangible web to overlie front edges of one or more flaps formed in the server lid. Ultrasonic welds connect the overlying tear strip to the flaps or adjacent the flaps for providing a tamper evident feature.
1. A closure for a container, the closure being a single molded plastic unit and comprising in combination:
a. a base member constructed to overlie and fit to an associated container, the base member having a plurality of dispensing openings formed therein,
b. a plurality of flaps joined to the base member at an elongated hinge line and positioned for closing the dispensing openings, the flaps having front edges opposite to and parallel to the hinge line,
c. a tear strip formed on an edge of the base member opposite the hinge line and connected to the base member by at least one frangible web, the tear strip hinging about the frangible web to a position overlying the front edges of the flaps, and
d. plastic welds for connecting the overlying edge of the tear strip to provide a tamper evident feature.
2. The closure of claim 1 wherein at least one of the plastic welds connects the tear strip to one of the flaps.
3. The closure of claim 2 wherein at least one of the plastic welds connects the tear strip to a portion of the base member adjacent a flap front.
4. The closure of claim 1 wherein at least one of the plastic welds connects the tear strip to a portion of the base member adjacent a flap front.
5. The closure of claim 1 in which at least some of the plastic welds connect the tear strip to the flaps on the upper surface of the flaps near the front edges thereof.
6. The closure of claim 5 in which the closure provides three dispensing openings, three flaps for individually closing the dispensing openings, and wherein the tear strip has plastic welds to at least two of the flaps.
7. The closure of claim 1 wherein the frangible webs of the tear strip have an upstanding shoulder connected to a horizontal ledge such that when the tear strip is sealed over the flaps, the tear strip presents a stacking shoulder.
8. The closure of claim 1 in which the base member has a peripheral shoulder for providing a stacking ledge, and wherein the tear strip has a profile which is shouldered to provide a stacking rim.
9. The closure of claim 1 in which three frangible webs interconnect the tear strip to the base member.
10. The closure of claim 1 in which the panel has three flaps, and a plurality of welds provide a tamper evident feature for all of said flaps.
11. The closure of claim 10 wherein a plurality of projections define the position of the welds, and the welds are ultrasonic welds.
12. The closure of claim 11 wherein the plurality of projections are formed on the tear strip.
13. The closure of claim 1 in which the frangible web joining the tear strip to the base member is less than twenty-five percent of the thickness of the base member whereby the tear strip is readily removed upon opening of the closure.