Apparatus for RF active compositions used in adhesion, bonding, and coating

a technology of active compositions and apparatus, applied in resistance welding apparatus, glue/gelatin preparation, coatings, etc., can solve the problems of inconvenient use of flakes as susceptors in thin films, inability to adapt to conventional adhesives, and inability to make trade-offs

Inactive Publication Date: 2001-11-01
AMBRELL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional adhesives are not suitable RF susceptors that can be directly heated and activated by RF heating.
However, these flakes are not well suited for use as susceptors in thin film bonding applications in which physical distortions, discolorations in the surface, or opacity of the bonded films would result from the flakes.
A disadvantage of this type of method is that a tradeoff must be made between the size of the particle employed versus the power level and duration of the inductive heating process.
Another disadvantage of this type of method is the high levels of loading of the medium with RF susceptor particles that is required for efficient activation.
Such high loading levels detract from the physical properties and rheology of the adhesive composition.
Still another disadvantage is the dark color and opacity of the composition, which renders the composition undesirable for many applications.
A disadvantage of this type of film and sealing process is the inherent tendency to also heat the adherand.
When a divalent or a trivalent metal ion is used, the resulting sulfonated polyesters are not ordinarily easily dissipated by cold water, but are more readily dissipated in hot water.
Compositions comprising branched sulfonated polyesters tend

Method used

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  • Apparatus for RF active compositions used in adhesion, bonding, and coating
  • Apparatus for RF active compositions used in adhesion, bonding, and coating
  • Apparatus for RF active compositions used in adhesion, bonding, and coating

Examples

Experimental program
Comparison scheme
Effect test

example 2

[0434] The susceptor composition utilized in this example comprised SnCl.sub.2 in a concentration of about 33%, dissolved in a mixture of NMP in a concentration of about 50% and PVP in a concentration of about 17%. Various PP and PB substrate surfaces were coated with the RF susceptor composition, including: (1) PP non-woven and (2) PE film. The susceptor composition was hand drawn onto each surface as a wet layer that would eventually dry, leaving a coating which was dry to the touch. RF heating tests were performed on the coated substrates. In each case, two like samples were placed together with the coated surfaces in contact with one another. The contacted surfaces were placed in a load coil that was designed to clamp the surfaces firmly together and transversely heat a 0.25 inch.times.8 inch strip of the susceptor composition. The operating frequency was about 14 MHz, and the power delivered to the coil was about 1 kW. The tests were split into two parts: using a wet susceptor ...

example 3

[0438] In this example, an RF activated susceptor composition was prepared from an EASTMAN AQ branched polyester (available from the Eastman Chemical Corporation) and an aqueous solution of SnCl.sub.2. Various layers of PP non-woven and PE film were tested. The susceptor composition that was used in this example comprised SnCl.sub.2 dissolved in distilled water. This solution was blended with a branched polyester adhesive component, EASTMAN AQ35S. Suitable concentrations of the branched polyester ranged from about 25% to about 75%.

[0439] In a series of experiments, the susceptor composition was used to adhere all combinations of: (1) PP non-woven and (2) PE film substrates. In each experimental combination, the composition was first coated onto the two substrate surfaces and dried under ambient conditions similar to those used in commercial practice. The two substrates were then pressed together in the work coil with the two susceptor composition coated surfaces in contact with each...

example 3a

[0440] Analogous to Example 3 above, the active ingredients Eastman AQ35S and SnCl.sub.2 (in constituent concentrations consistent with the parameters described above) were dissolved in NMP to form a susceptor composition. The composition was coated on a PP non-woven web and was allowed to air dry. The slightly tacky web was placed between polyolefin substrates and the assemblies were RF heated in the RF work station at 14.65 MHz and about 0.8 kW for 5 seconds.

[0441] Good adhesion was obtained in each case.

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Abstract

A susceptor composition that can bond two or more layers or substrates to one another and that can be used to coat or cut a substrate. The susceptor composition is activated in the presence of radio frequency (RF) energy. In one embodiment, the susceptor composition of the present invention comprises a susceptor and a carrier. The carrier and susceptor are blended with one another and form a mixture, preferably a uniform mixture. The susceptor is present in an amount effective to allow the susceptor composition to be heated by RF energy. In a preferred embodiment, the susceptor also functions as an adhesive. The susceptor is an ionic or polar compound and acts as either a charge-carrying or an oscillating/vibrating component of the susceptor composition. The susceptor generates thermal energy in the presence of an RF electromagnetic or electrical field (hereafter RF field).

Description

[0001] The present application is a continuation-in-part of application Ser. No. 09 / 404,200, filed Sep. 23, 1999, which is a continuation-in-part of application Ser. No. 09 / 270,505, filed Mar. 17, 1999, which claims the benefit of U.S. provisional application No. 60 / 078,282, the contents of each of which are fully incorporated by reference herein.[0002] This patent application is related to the following co-pending U.S. utility patent application: "Radio Frequency Heating System," -application Ser. No. 09 / 270,507, filed Mar. 17, 1999, the contents of which are incorporated by reference herein.[0003] 1. Field of the Invention[0004] This invention relates generally to the use of media containing ionic compounds and / or nonionic compounds with high dipole moments as a radio frequency (RF) susceptors in RF activated systems.[0005] 2. Related Art[0006] Radio frequency (RF) heating is a well established non-contact precision heating method that is used to generate heat directly within RF s...

Claims

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Application Information

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IPC IPC(8): C09D5/02B29C65/36C08L67/00C09D133/02C09D167/00C09D189/00C09D201/00C09J5/04C09J5/06C09J11/00C09J133/02C09J167/00C09J189/00C09J201/00
CPCB29C66/71Y10T428/2809C09D167/00C09J5/04C09J5/06C09J11/00C09J167/00C09J2467/00C08L67/00B29C66/5346B29C65/3656B29C65/3696B29C65/3676B29C65/368B29C65/3684B29C66/83413B29C66/836B29C65/00B29C66/0044B29C66/112B29C66/1122B29C66/114B29C66/1222B29C66/1224B29C66/12425B29C66/12445B29C66/12821B29C66/1284B29C66/43B29C66/431B29C66/45B29C66/472B29C66/53461B29C66/542B29C66/72328B29C66/7234B29C66/73117B29C66/73151B29C66/73921B29C66/73941B29C66/8122B29C66/81263B29C66/81871B29C66/8322B29C66/83221B29K2995/007B29K2827/18B29K2077/00B29K2067/046B29K2067/00B29K2033/08B29K2027/06B29K2025/06B29K2023/12B29K2023/086B29K2023/06B29K2023/00B29K2001/00
Inventor RYAN, WILLIAM J.GORBOLD, JONATHAN M.ADISHIAN, GARY C.
Owner AMBRELL CORP
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