Container bottom heater

Patent metadata

Field	Value
Publication number	US-2018304570-A1
Application number	US-201816025454-A
Country	US
Kind code	A1
Filing date	Jul 2, 2018
Priority date	Apr 1, 2015
Publication date	Oct 25, 2018
Grant date	—

Abstract

A bottom heater for use in assembling a container bottom and a sleeve includes a body having a peripheral wall and a heated air passage terminating in an outlet in the peripheral wall. A shape of at least a portion of the peripheral wall defining the outlet is such that heated air exiting the outlet is fluidly attached to an adjacent portion of the peripheral wall after exit because of the Coanda effect.

First claim

What is claimed is:

1 . A bottom heater for use with a container forming machine for assembling a container bottom to a sleeve, the bottom heater comprising:
a circumferentially curved body having a peripheral wall terminating at an end wall; and a heated air passage terminating in an outlet in the peripheral wall; wherein a shape of at least a portion of the peripheral wall defining the outlet is curved axially along the body such that heated air exiting the outlet is fluidly attached to an adjacent portion of the peripheral wall after exit because of the Coanda effect.

2 . The bottom heater of claim 1 wherein the outlet is continuous.

3 . The bottom heater of claim 2 wherein the outlet extends entirely about a circumference of the body.

4 . The bottom heater of claim 1 wherein the outlet separates the peripheral wall into first and second portions, and at least one of the first and second portions has a radius defining the shape of the at least a portion of the peripheral wall defining the outlet that is curved axially to control a direction of the Coanda effect.

5 . The bottom heater of claim 1 wherein the Coanda effect is maintained for a predetermined distance along the peripheral wall.

6 . The bottom heater of claim 5 wherein the predetermined distance corresponds to a functional heating area in an adjacent surface of a sleeve, a container bottom, or a combination of a sleeve and a container bottom.

7 . The bottom heater of claim 6 wherein the functional heating area corresponds to a portion of the sleeve or the container bottom that overlaps with the other of the sleeve or the container bottom when the sleeve is folded inward to seal the container bottom with the sleeve.

8 . The bottom heater of claim 1 wherein the heated air passage is defined by a first wall and a second wall and wherein the first wall, second wall, or both the first and second wall are provided at an angle with respect to an axis of the body.

9 . The bottom heater of claim 1 wherein a proportion of the heated air attached to the adjacent portion of the peripheral wall because of the Coanda effect is varied to control an amount of heat provided to a container bottom disposed adjacent the bottom heater in use.

10 . The bottom heater of claim 1 wherein the outlet comprises a plurality of discrete openings and wherein at least a portion of the peripheral wall defining the plurality of discrete openings is curved axially along the body such that at least a portion of the heated air exiting the plurality of discrete openings is fluidly attached to an adjacent portion of the peripheral wall after exit because of the Coanda effect.

11 . The bottom heater of claim 10 wherein the plurality of discrete openings separates the peripheral wall into first and second portions, and at least one of the first and second portions for each of the plurality of discrete openings has a radius defining the shape of the at least a portion of the peripheral wall defining the plurality of discrete openings that is curved axially to control an amount and direction of the Coanda effect.

12 . The bottom heater of claim 1 wherein at least one of a radius defining the curved portion of the outlet, a dimension of the heated air passage, an angle of at least one wall defining the air passage with respect to an axis of the body, or combinations thereof are configured to control an amount and direction of the Coanda effect.

13 . A bottom heater for use with a container forming machine for assembling a container bottom to a sleeve, the bottom heater comprising:
a body having a peripheral wall terminating at an end wall; and a heated air passage defined by at least a top wall and a bottom wall, wherein at least one of the top wall or the bottom wall leads into the peripheral wall along a curved surface to define a curved outlet; wherein heated air flows through the curved outlet along the curved surface and along an adjacent portion of the peripheral wall for a predetermined distance due to the Coanda effect.

14 . The bottom heater of claim 13 wherein the curved outlet extends entirely about a circumference of the body.

15 . The bottom heater of claim 13 wherein the Coanda effect is maintained for a predetermined distance along the peripheral wall.

16 . The bottom heater of claim 15 wherein the predetermined distance corresponds to a functional heating area in an adjacent surface of a sleeve, a container bottom, or a combination of a sleeve and a container bottom.

17 . The bottom heater of claim 13 wherein at least one of the top wall, the bottom wall or both the top and bottom walls are provided at an angle with respect to an axis of the body.

18 . The bottom heater of claim 13 wherein a proportion of the heated air attached to the adjacent portion of the peripheral wall because of the Coanda effect is varied to control an amount of heat provided to a container bottom disposed adjacent the bottom heater in use.

19 . The bottom heater of claim 13 wherein the curved outlet comprises a plurality of discrete openings each defined by at least a top wall and a bottom wall, and wherein at least one of the top wall or the bottom wall for each of the plurality of discrete openings leads into the peripheral wall along a curved surface such that at least a portion of the heated air exiting the plurality of discrete openings is fluidly attached to an adjacent portion of the peripheral wall after exit because of the Coanda effect.

20 . The bottom heater of claim 13 wherein at least one of a radius defining the curved surface of the curved outlet, a dimension of the heated air passage, an angle of at least one of the top wall or bottom wall defining the heated air passage with respect to an axis of the body, or combinations thereof are configured to control an amount and direction of the Coanda effect.

Assignees

• Dart Container

Inventors

• Lamie Randy John

Classifications

• B31D5/00 Primary

  Multiple-step processes for making three-dimensional [3D] articles · CPC title

• B29C66/80

  General aspects of machine operations or constructions and parts thereof · CPC title

• B31B50/64 Primary

  by applying heat or pressure, e.g. by welding (to unite areas where adhesives are applied B31B50/62) · CPC title

• B31B2120/40

  lined or internally reinforced · CPC title

• B31B2110/10

  having a cross section of varying size or shape, e.g. conical or pyramidal · CPC title