Method for solvent bonding non-porous materials to automatically create variable bond characteristics

• US 5,259,894 A
• Filed: 01/26/1990
• Issued: 11/09/1993
• Est. Priority Date: 01/26/1990
• Status: Expired due to Fees

• Current Assignee: Value Plastics Incorporated (Nordson Corporation)
• Original Assignee: Richard K. Sampson
• Inventors: Sampson, Richard K.
• Primary Examiner(s): Gallagher, John J.
• Application Number:
  US07/470,931
• Time in Patent Office: 1,383 Days
• Field of Search: 156/64, 156/295, 156/305, 156/281, 156/308.6, 156/309.3, 403/270
• US Class Current: 156/64
• CPC Class Codes: B29C 65/4895 Solvent bonding, i.e. the surfaces of the parts to be joined being treated with solvents, swelling or softening agents, without adhesives
• CPC Class Codes: B29C 65/548 by capillarity
• CPC Class Codes: B29C 65/7829 said distance pieces being integral with at least one of the parts to be joined
• CPC Class Codes: B29C 66/1282 comprising at least one overlap joint-segment
• CPC Class Codes: B29C 66/12841 comprising at least two butt joint-segments
• CPC Class Codes: B29C 66/32 Measures for keeping the burr form under control; Avoiding burr formation; Shaping the burr deburring welded articles B29C37/04
• CPC Class Codes: B29C 66/5221 for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
• CPC Class Codes: B29C 66/52293 said stop being external
• CPC Class Codes: B29C 66/52297 said socket comprising slip-off prevention means B29C66/52296 takes precedence
• CPC Class Codes: B29C 66/52298 said socket being composed by several elements
• CPC Class Codes: B29C 66/54 Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
• CPC Class Codes: B29L 2031/24 Pipe joints or couplings B29L2031/26 takes precedence
• CPC Class Codes: Y10S 285/916 Molecular change
• CPC Class Codes: Y10T 403/477 Fusion bond, e.g., weld, etc.

Abstract

A method and apparatus for preengineering a solvent bond is disclosed. It creates the possibility of preestablishing designs to self-optimize the characteristics of the resultant solvent bond. These characteristics can thus be chosen by the part designer with confidence that inherent variations in the assembly process will not unduly impact the resultant bond. Setting the volume of dissolved material with acting upon it in the dissolved state are included.

Claims

1. A method of creating an engineered solvent bond between two items each having a nonporous surface to be bonded to the other comprising the steps of:

a. predetermining the volume of viscous material to be created;

then

b. providing at least one spacer between said surfaces;

c. removing said at least one spacer;

d. applying a solvent between the surfaces to be bonded;

then

e. creating an appropriate volume of viscous material through action of said solvent in dissolving the surfaces;

then

f. acting upon the surfaces while they are in a dissolved state in order to intermix said viscous material from both surfaces;

then

g. curing said surfaces to eliminate said viscous material and create a bonded joint.

2. A method of creating an engineered solvent bond between two nonporous surfaces as described in claim 1 and further comprising the step of substantially dissolving said at least one spacer while accomplishing the step of creating the volume of viscous material.

3. A method of creating an engineered solvent bond between two nonporous surfaces as described in claim 2 and further comprising the step of applying a predetermined force for the purpose of eventually effecting a displacement of the surfaces, said step of applying occurring prior to accomplishing the step of applying the solvent between the surfaces to be bonded.

4. A method of creating an engineered solvent bond between two nonporous surfaces as described in claim 2 and further comprising the step of applying a predetermined force for the purpose of eventually effecting a displacement of the surfaces, said step of applying occurring prior to accomplishing the step of substantially dissolving said at least one spacer.

5. A method of creating an engineered solvent bond between two items each having a nonporous surface to be bonded to the other comprising the steps of:

a. predeterming the volume of viscous material to be created;

then

b. applying a solvent between the surfaces to be bonded;

then

c. creating an appropriate volume of viscous material through action of said solvent in dissolving the surfaces;

then

d. acting upon the surfaces while they are in a dissolved state in order to intermix said viscous material from both surfaces, wherein said step of acting comprises the steps of;

i. displacing one of said surfaces with respect to the other surface; and

ii. timing said displacement to occur at a consistent point during the dissolving of said surfaces based upon the amount of dissolving having occurred;

then

e. curing said surfaces to eliminate said viscous material and create a bonded joint.

6. A method of creating an engineered solvent bond between two nonporous surfaces as described in claim 5 wherein said point during the dissolving is automatically determined.

7. A method of creating an engineered solvent bond between two nonporous surfaces as described in claim 6 wherein said step of timing said displacement is determined through operation of said surfaces.

8. A method of creating an engineered solvent bond between two nonporous surfaces as described in claim 7 wherein said surface comprises an integral spacer and wherein said step of acting to time said displacement comprises the step of substantially dissolving the spacer.

9. A method of creating an engineered solvent bond between two nonporous surfaces as described in claim 8 and further comprising the step of freeing said items to move relative to each other while accomplishing the step of curing said surfaces.

10. A method of creating an engineered solvent bond to join at least two nonporous surfaces together at a planar surface comprising the steps of:

a. determining the desired characteristics of the bond to be created;

b. predetermining the volume of viscous material necessary to produce said desired characteristics;

then

c. establishing an appropriate capillary distribution for a solvent, then;

d. applying said solvent to create the bond to at least one of the surface to be bonded;

then

e. assuring the creation of the desired characteristics of bond through action of said solvent, wherein said action of said solvent dissolves at least one of said surfaces to produce a volume of viscous material, and wherein said step of assuring the desired characteristics comprises the step of distributing the solvent in a predetermined manner throughout said planar surface wherein said solvent has the property of capillary action and wherein said step of distributing the solvent is achieved automatically through the capillary action of said solvent; and

then

f. acting upon said surface while dissolved in order to intermix said viscous material properly;

then

g. curing said bond to create an assembly having the desired characteristics.

11. A method of creating an engineered solvent bond to join at least two nonporous surfaces together as described in claim 10 wherein said step of establishing the appropriate capillary distribution comprises the step of creating a reservoir having a predetermined volume between said surfaces into which the solvent will be applied.

12. A method of creating an engineered solvent bond to join at least two nonporous surfaces together as described in claim 11 wherein said step of creating the reservoir comprises the step of utilizing a spacer having a predetermined thickness between the surfaces to be bonded.

13. A method of creating an engineered solvent bond to join at least two nonporous surfaces together as described in claim 12 wherein said step of utilizing a spacer comprises the step of making said spacer integral to at least one of said surfaces.

14. A method of creating an engineered solvent bond to join at least two nonporous surfaces together as described in claim 13 wherein said step of making said spacer integral comprises the step of providing protrusions on said surface.

15. A method of creating an engineering solvent bond to join at least two nonporous surfaces together as described in claim 14 and further comprising the step of substantially dissolving said spacer prior to said step of curing the bond.

16. A method of creating an engineered solvent bond to join at least two nonporous surfaces together as described in claim 12 and further comprising the step of removing said spacer without changing the relative positions of said surfaces to be bonded prior to said step of applying the solvent.

17. A method of creating an engineered solvent bond having desired characteristics between two items each having a nonporous surface to be bonded to the other comprising the steps of:

a. predetermining an appropriate volume of viscous material necessary to produce said desired bond characteristics;

then

b. determining the volume of solvent desirable to create the appropriate volume of viscous material; and

then

c. placing said surfaces in proximity to each other; and

then

d. establishing a reservoir having a predetermined volume between said surfaces and into which the solvent will be applied, wherein the predetermined volume of the reservoir is substantially equal to the volume of solvent desired; and

then

e. completely filling said reservoir with said solvent;

thus

f. applying said solvent between said surfaces to be bonded; and

then

g. dissolving said surfaces to create said volume of viscous material to create a solvent bond; and

then

h. acting upon said surfaces while dissolved in order to intermix said viscous material.

18. A method of creating an engineered solvent bond having desired characteristics between two items each having a nonporous surface to be bonded to the other as described in claim 17 and further comprising the step of decreasing the volume of said reservoir to eliminate some of said viscous material at some point during accomplishing the step of dissolving said surfaces.

19. A method of creating an engineered solvent bond having desired characteristics between two items each having a nonporous surface to be bonded to the other as described in claim 18 and further comprising the step of timing said step of decreasing the volume of said viscous material based upon the amount of dissolving having occurred.

20. A method of creating an engineered solvent bond having desired characteristics between two items each having a nonporous surface to be bonded to the other as described in claim 19 and further comprising the step of applying a force to decrease the volume of said reservoir while accomplishing said step of dissolving said surfaces.

21. A method of creating an engineered solvent bond having desired characteristics between two items each having a nonporous surface to be bonded to the other as described in claim 19 and further comprising the step of applying a force to decrease the volume of said reservoir prior to accomplishing the step of applying the solvent between the surfaces to be bonded.

22. A method of creating an engineered solvent bond having desired characteristics between two items each having a nonporous surface to be bonded to the other as described in claim 20 and further comprising the step of automatically determining the amount of dissolving appropriate to initiate the step of decreasing the volume of said reservoir.

23. A method of creating and engineered solvent bond having desired characteristics between two items each having a nonporous surface to be bonded to the other as described in claim 22 wherein said reservoir is established by at least one spacer, and said step of automatically determining the amount of dissolving is determined by substantially dissolving said at least one spacer.