Method of making a plurality of bonded blank assemblies

A method of making a plurality of bonded composite blank assemblies for the manufacture of cookware, comprising the steps of:

• (a) providing at least two blank assemblies for bonding, wherein each blank assembly comprises a first, second, and third disc of planar materials and a perforated template positioned on an outer surface of the first disc of each blank assembly;
• (b) placing the at least two blank assemblies into a pressing fixture wherein each of the blank assemblies has a separation disc placed between adjacent assemblies to prevent bonding between adjacent assemblies;
• (c) applying pressure in a normal direction on the blank assemblies by way of the pressing fixture;
• (d) heating the blank assemblies while under pressure at a sufficient temperature and time to achieve a desired level of bonding between each of the discs in each of the blank assemblies;
• (e) forming a plurality of spaced-apart bubbles along a surface of the first planar disc material of each blank assembly during steps (c) and (d), wherein the bonding between the bubbles and the second disc is of a lesser degree than the bonding between the first disc and second disc in areas intermediate said bubbles, whereby a coefficient of heat conductivity is greater in said intermediate areas than in said bubbles in each of the bonded blank assemblies;
• (f) cooling the assemblies and removing each bonded assembly from the pressing fixture;
• (g) separating each bonded blank assembly from an adjacent bonded blank assembly;
• and
• (h) forming an item of cookware from each bonded blank assembly.

A method of making a plurality of bonded composite blank assemblies for the manufacture of cookware, comprising the steps of:

• (a) providing at least two blank assemblies for bonding, wherein each blank assembly comprises at least two discs of materials which are different metals and a perforated template having a plurality of holes formed and therein placed on a first disc of the at least two discs, where the discs are of a predetermined size suitable for forming into a desired shape of cookware;
• (b) placing the at least two blank assemblies into a pressing fixture wherein each of the assemblies has a separation disc placed between adjacent assemblies to prevent bonding between adjacent assemblies;
• (c) exerting an axial force on the assemblies by way of the pressing fixture;
• (d) heating the assemblies while under pressure at a sufficient temperature and time to achieve a desired level of bonding between each of the discs in each of the assemblies;
• (e) forming a plurality of spaced-apart bubbles along a surface of the first disc of each blank assembly during steps (c) and (d), wherein the bonding between the bubbles and a second disc of the at least two discs is of a lesser degree than the bonding between the first disc and the second disc in areas intermediate said bubbles, whereby a coefficient of heat conductivity is greater in said intermediate areas than in said bubbles in each of the bonded blank assemblies;
• (f) cooling the assemblies and removing each bonded assembly from the pressing fixture;
• (g) separating each bonded assembly from an adjacent bonded assembly.

A method of making a plurality of bonded composite blank assemblies, comprising the steps of:

• (a) providing at least two blank assemblies for bonding, wherein each blank assembly comprises two discs of materials which are of different metals and a perforated template having a plurality of holes formed therein and placed on a first of the two discs, where the discs are of a predetermined size suitable for forming into a desired shape;
• (b) placing the at least two blank assemblies into a pressing fixture wherein each of the assemblies has a separation disc placed between adjacent assemblies to prevent bonding between adjacent assemblies;
• (c) exerting an axial force on the assemblies by way of the pressing fixture;
• (d) heating the assemblies while under pressure at a sufficient temperature and time to achieve a desired level of bonding between each of the discs in each of the assemblies;
• (e) forming a plurality of spaced-apart bubbles along a surface of the first disc of each blank assembly during steps (c) and (d), wherein the bonding between the bubbles and a second of the two discs is of a lesser degree than the bonding between the first disc and the second disc in areas intermediate said bubbles, whereby a coefficient of heat conductivity is greater in said intermediate areas than in said bubbles in each of the bonded blank assemblies;
• (f) cooling the assemblies and removing each bonded assembly from the pressing fixture;
• and
• (g) separating each bonded assembly from an adjacent bonded assembly.