Ultrasonic comb horn and methods for using same

• US 5,171,387 A
• Filed: 05/10/1991
• Issued: 12/15/1992
• Est. Priority Date: 01/19/1990
• Status: Expired due to Fees

• Current Assignee: Sonokinetics Group
• Original Assignee: Sonokinetics Group
• Inventors: Wuchinich, David G.
• Primary Examiner(s): Simmons, David A.
• Assistant Examiner(s): SELLS, JAMES D
• Application Number:
  US07/698,764
• Time in Patent Office: 585 Days
• Field of Search: 156/73.1, 156/73.3, 156/73.4, 156/580.1, 156/580.2, 310/323, 310/325, 310/328, 228/1.1, 228/110, 264/23, 425/174.2, 15/320, 15/321, 15/382
• US Class Current: 156/73.3
• CPC Class Codes: B06B 3/00 Methods or apparatus specially adapted for transmitting mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
• CPC Class Codes: B29C 65/08 using ultrasonic vibrations non-plastics element to plastics elements B29C65/645
• CPC Class Codes: B29C 65/086 using a rotary anvil
• CPC Class Codes: B29C 65/7894 of continuously moving sheets or webs
• CPC Class Codes: B29C 66/1122 Single lap to lap joints, i.e. overlap joints B29C66/45, B29C66/472, B29C66/52272 take precedence
• CPC Class Codes: B29C 66/43 Joining a relatively small portion of the surface of said articles B29C66/45 takes precedence
• CPC Class Codes: B29C 66/45 Joining of substantially the whole surface of the articles methods or apparatus for laminating B32B37/00
• CPC Class Codes: B29C 66/71 characterised by the composition of the plastics material of the parts to be joined welding bar compositions B29C65/125
• CPC Class Codes: B29C 66/712 the composition of one of the parts to be joined being different from the composition of the other part
• CPC Class Codes: B29C 66/73921 characterised by the materials of both parts being thermoplastics
• CPC Class Codes: B29C 66/80 General aspects of machine operations or constructions and parts thereof
• CPC Class Codes: B29C 66/81433 being toothed, i.e. comprising several teeth or pins comprising a single tooth B29C66/81429, or being patterned
• CPC Class Codes: B29C 66/8145 characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps B29C66/816 and B29C66/818 take precedence; adaptable for making articles or joints of different dimensions B29C66/841
• CPC Class Codes: B29C 66/81463 comprising a plurality of single pressing elements, e.g. a plurality of sonotrodes, or comprising a plurality of single counter-pressing elements, e.g. a plurality of anvils, said plurality of said single elements being suitable for making a single joint
• CPC Class Codes: B29C 66/81469 one placed next to the other in a single line transverse to the feed direction, e.g. shoulder to shoulder sonotrodes
• CPC Class Codes: B29C 66/81811 of the welding jaws
• CPC Class Codes: B29C 66/83411 Roller, cylinder or drum types B29C66/83431 takes precedence; rollers, cylinders or drums moving relative to and tangentially to the parts to be joined B29C66/8362
• CPC Class Codes: B29C 66/836 Moving relative to and tangentially to the parts to be joined, e.g. transversely to the displacement of the parts to be joined, e.g. using a X-Y table B29C66/65 takes precedence
• CPC Class Codes: B29C 66/9513 characterised by specific vibration frequency values or ranges
• CPC Class Codes: B29C 66/9516 by controlling their vibration amplitude
• CPC Class Codes: B29K 2023/06 : PE, i.e. polyethylene
• CPC Class Codes: B29K 2067/00 : Use of polyesters or derivatives thereof, as moulding material

Abstract

A unitary extended width comb horn for generating ultrasonic vibrations over a width of greater than 12 inches for a frequency of 20 kHz wherein such vibrations vary by less than ±10% across the width of the horn. Also, processes utilizing this horn and related devices incorporating same.

Claims

1. A method for subjecting at least one material having a width of at least about 12 inches to ultrasonic vibrations of a frequency of greater than 18 kHz which comprises:

constructing a unitary vibration generating apparatus having a width which is substantially the same as the material to be treated;

generating vibrations from said vibration generating apparatus which do not vary in amplitude by more than ±

10% across said width; and

passing said material between said vibration generating apparatus and a support member to subject a portion of the material to said ultrasonic vibrations.

2. The method of claim 1 wherein said at least one material comprises two separate sheet materials and which method further comprises at least partially bonding said sheet materials together.

3. The method of claim 1 wherein the support member is a rotating element and which method further comprises compressing at least portion of said at least one material between said rotating element and vibration generating apparatus.

4. The method of claim 3 wherein said at least one material comprises two separate thermoplastic sheets and which method further comprises at least partially laminating said sheet materials together.

5. The method of claim 4 wherein one of said rotating element or vibration generating apparatus includes a pattern and which method further comprises imparting said pattern upon said laminate.

6. The method of claim 3 wherein said at least one material is discontinuous and which method further comprises forming said material as an integral sheet by passing said vibrations through said discontinuous material.

7. The method of claim 1 wherein said material is cut in one or more locations when passing between said vibration generation apparatus and support member.

11. The method of claim 1 wherein the material is a plurality of fibers and which method further comprises conveying said fibers to said vibration generating apparatus and forming a fabric as said fibers pass between said vibration generating apparatus and support member.

12. The method of claim 11 which further comprises imparting a pattern into said fabric.

14. The method of claim 1 wherein said material is a metal sheet and which method further comprises finishing said metal sheet to a final dimension and condition.

15. The method of claim 14 wherein said finishing step includes one or more of rolling, grinding, deburring, machining or cleaning said material.

16. The method of claim 11 wherein said material is a particulate solid and which method further comprises compacting said articulate solid as it passes between said vibration generating apparatus and support member.

17. The method of claim 1 wherein said material includes two sheets and which method further comprises joining said sheets as they pass between said vibration generating apparatus and support member.

18. The method of claim 17 wherein said sheets are welded or soldered together after passing between said vibration generating apparatus and support member.

19. The method of claim 1 which further comprises cleaning said material as it passes between said vibration generating apparatus and support member.

20. The method of claim 19 which further comprises applying a liquid to said material before or as said material passes between said vibration generating apparatus and said support member.

21. The method of claim 20 wherein said cleaning step includes removing said applied liquid as or after the material passes between said vibration generating apparatus and support member.

8. A method for subjecting at least one material having a width of at least about 12 inches to ultrasonic vibrations of a frequency of greater than 18 kHz which comprises:

constructing a unitary vibration generating apparatus having a width which is substantially the same as the material to be treated;

generating vibrations from said vibration generating apparatus which do not vary by more than +10% across said width; and

passing said material between said vibration generating apparatus and a support member to subject a portion of the material to said ultrasonic vibrations,

wherein said material includes a mixture of solid and liquid components and which method further comprises

separating said liquid component from said solid component when said material passes between said vibration generation apparatus and said support member.

9. The method of claim 8 which further comprises spacing said support member a predetermined distance from said material.

10. The method of claim 9 which further comprises applying a vacuum to said support to assist in the separation of the liquid component from the solid component.

13. A method for subjecting at least one material having a width of at least about 12 inches to ultrasonic vibrations of a frequency of greater than 18 kHz which comprises:

constructing a unitary vibration generating apparatus having a width which is substantially the same as the material to be treated;

generating vibrations from said vibration generating apparatus which do not vary by more than +10% across said width; and

passing said material between said vibration generating apparatus and a support member to subject a portion of the material to said ultrasonic vibrations,

wherein said support member includes a rotating element in combination with means for scraping said material from said rotating element, and which method further comprises atomizing said material into particles as it passes by said rotating element, scraping means and vibration generating means.

22. A method for subjecting at least one material having a width of at least about 12 inches to ultrasonic vibrations which comprises:

constructing a unitary vibration generating apparatus comprising means for generating vibrations in a first direction;

a spine member having first and second ends and being operatively associated with the vibration generating means, said spine member being oriented perpendicular to the direction of said generated vibrations; and

a plurality of tine members having a working end for transmitting said generated vibrations and extending perpendicularly from said spine member in the direction of said generated vibrations, each tine member positioned and attached at an antinode location along said spine member and having a length of nΓ

/2 wherein n is an integer and Γ

is equal to c/f where c is the velocity of sound in the apparatus and f is the chosen frequency of vibration, wherein first and second tine members positioned on said spine member opposite the attachment of said vibration generation means are attached at their working end but are otherwise separated by a space extending along their length; and

wherein each other tine member is connected to adjacent tine members only at points along their length of nΓ

/4 wherein n is an odd integer;

said other tine members forming a symmetrical pattern on each side of a plane passing vertically between said first and second tine members;

wherein the working end of each tine member other than said first and second tine members is separated from the working end of each adjacent tine members;

said vibration generating apparatus having a width which is substantially the same as the material to be treated;

generating vibrations from said vibration generating apparatus which do not vary by more than ±

10% across said width; and

passing said material between said vibration generating apparatus and a support member to subject a portion of the material to said ultrasonic vibrations.

23. A method for subjecting at least one material having a width of at least about 12 inches to ultrasonic vibrations which comprises:

constructing a unitary vibration generating apparatus comprising means for generating vibrations in a first direction;

a spine member having first and second ends and being operatively associated with the vibration generating means, said spine member being oriented perpendicular to the direction of said generated vibrations; and

a plurality of tine members having a working end for transmitting said generated vibrations and extending perpendicularly from said spine member in the direction of said generated vibrations, wherein each tine member is positioned and attached at every other antinode location along said spine member so that each tine member vibrates in the same direction, each tine member having length of nΓ

/2 wherein n is an integer and Γ

is equal to c/f where c is the velocity of sound in the apparatus and f is the chosen frequency of vibration, and further wherein each tine member is attached at its working end to each adjacent tine member but is separated therefrom by a slot extending substantially along its length, thus forming a unitary working end for the apparatus;

said vibration generating apparatus having a width which is substantially the same as the material to be treated;

generating vibrations from said vibration generating apparatus which do not vary by more than ±

10% across said width; and

passing said material between said vibration generating apparatus and a support member to subject a portion of the material to said ultrasonic vibrations.

24. A method for subjecting at least one material having a width of at least about 12 inches to ultrasonic vibrations which comprises:

constructing a unitary vibration generating apparatus comprising a spine member having first and second ends and being operatively associated with the vibration generating means, said spine member being oriented perpendicular to the direction of said generated vibrations;

a plurality of tine members having a working end for transmitting said generated vibrations and extending perpendicularly from said spine member in the direction of said generated vibrations, each tine member positioned and attached at an antinode location along said elongated member and having a length of nΓ

/2 wherein n is an integer and Γ

is equal to c/f where c is the velocity of sound in the apparatus and f is the chosen frequency of vibration, wherein first and second tine members positioned on said elongated member opposite the attachment of said vibration generation means are attached at their working end but are otherwise separated by a space extending along their length; and

wherein each other tine member is connected too adjacent tine members only at points along their length of nΓ

/4 wherein n is an odd integer;

said other tine members forming a symmetrical pattern on each side of a plane passing vertically between the mid-point of the spine member;

wherein the working end of each tine member other than said first and second tine members is separated from the working end of each adjacent tine member; and

a plurality of half wavelength extensional resonators mounted symmetrically on said spine member about said plane of symmetry;

said vibration generating apparatus having a width which is substantially the same as the material to be treated;

generating vibrations from said vibration generating apparatus which do not vary by more than ±

10% across said width; and

passing said material between said vibration generating apparatus and a support member to subject a portion of the material to said ultrasonic vibrations.

25. A method for creating an ultrasonic vibrational field, which comprises:

generating vibrations in a first direction;

vibrating a spine member with the vibrations to generate node and antinode locations along the spine member, the spine member being oriented substantially perpendicular to the first direction;

vibrating a plurality of tine members having first ends attached to the spine member at antinode locations along the spine member, and second ends attached to adjacent tine members, wherein adjacent tine members are separated along part of their lengths;

selecting the frequency of vibrations to equal nc/2L, where n is an integer, c is the speed of sound in the spine and tine members, and L is the length of the tine members; and

subjecting a material to the ultrasonic vibrations which are generated by the second ends of the tine members.

26. The method of claim 25, wherein the attached second ends of the tine members form a horn face, and which further comprises locating the horn face proximate to a material to subject the material to ultrasonic vibration.

27. The method of claim 26, wherein the material is a plurality of thermoplastic sheets and which further comprises welding the sheets together with the ultrasonic vibration.

28. The method of claim 26, wherein the material is a gauze comprising fibers and which further comprises welding the fibers together with the ultrasonic vibration.

29. The method of claim 26, wherein the material is a wet web and which further comprises drying the web with the ultrasonic vibration.

30. The method of claim 26, wherein the material is soiled and which further comprises loosening soil particles from the material with the ultrasonic vibration, and removing the soil particles from the material by applying a detergent to the soiled material and vacuuming the material.

31. The method of claim 26, wherein the material is waste and which further comprises atomizing the waste to produce a mist and a dried waste, and removing the mist from the vicinity of the dried waste.