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PACKWORLD 9 Steps to Heat Sealing Perfection

Step 4Heatseal Jaw Design
How to make a functioning heatseal jaw?

Heatseal jaw design is relatively simple. It is made even easier by the use of TOSS components that are available to facilitate the construction.

Good sealing depends upon equal and even contact between the jaws for the full length of the jaws. This means that the jaw bars must be straight and evenly loaded to avoid bowing of the jaws during the sealing process. When building long jaws, it may be necessary to utilize a supplementary bar as a stiffening back-up member.

Sealing is accomplished when the seal area cools, therefore, the ability of the jaw bar to absorb heat is important (See STEP 3. Modes of Sealing). Aluminum is usually used in Heatseal Bars because it has a high specific heat and thermal conductivity as well as being light and easy to machine. Jaw Bars offered TOSS by include a cooling passage for the full length of the jaw bar. In most cases it is not needed, but additional cooling can shorten the cycle time by one or more seconds. This time saving can be very important in high speed production.

Jaw Bars and Jaw End Kits
TOSS supplies custom made Heatseal Jaw Bars which include Jaw End Blocks for attaching the Heatseal Band to the bar. Heatseal Jaw End Kits are also available for making ones own jaw bar assemblies. These kits contain the jaw end tension blocks together with the springs, spring plungers, attaching swing bolts, and installation instructions.

Jaw Force
The force required to effect a good seal or cut is a function of the material composition, the band shape, the hardness of the underlayment back-up material, the hardness and thickness of the elastomeric pad on the opposite jaw, and the desired result. The optimum force required can only be determined empirically and optimum results can only be attained by testing. As a starting point, one should set-up using a minimum unit force equal to 50#/sq.in. of Heatseal Band surface. More force may be needed to get a clean cut on hard materials or non-woven fabrics and less might be desirable on delicate materials.

Heatseal Band Tension
Heatseal Bands expand when they are heated; therefore, a means must be provided to take up the slack or the Heatseal Band will buckle and break prematurely. The Heatseal Band is also an electrical conductor so the band must be electrically insulated from the bar. The bar must, therefore, be fitted with end connector blocks that can provide tension on the band and remain electrically insulated. TOSS offers several different Jaw End Kits for Heatseal Bands and cut wires that can be conveniently mounted on the ends of the jaw bars to serve this function. TOSS Jaw End Kits are designed to fit on to the ends of 3/4" x 2" or larger bars. This is usually a convenient cross-section for jaw bars and it provides a reasonable amount of heatsink capacity for most applications.

Insulation
The face of the jaw bar must also be electrically insulated. This can be done with a variety of materials. The most convenient of these materials are PTFE Tape, Durit, and Siglaha that are available from TOSS with self adhesive backing to facilitate attachment. The proper selection is a function of the sealing mode (See STEP 5. Back-Up Materials, for more information).

Continue to Step 5
Heatseal Band Back-Ups & Jaw Facing

Select a facing for the jaw.

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9 Steps to Heat Sealing Perfection

STEP 1 - Heat Sealing Configuration
Determine what is expected from the seal.

STEP 2 - Heatseal Band Selection
Select the proper Heatseal Band for the job.

STEP 3 - Modes of Sealing
Which sealing mode is best for this application?

STEP 4 - Heatseal Jaw Design
How to make a functioning Heatseal Jaw?

STEP 5 - Heatseal Band
Back-Ups & Jaw Facings

Select a facing for the jaw.

STEP 6 - Anti-Stick Provisions
Keep the hot plastic from sticking.

STEP 7 - Timing
When to heat and when to cool.

STEP 8 - Transformer Selection
Size the transformer.

STEP 9 - Controller Selection
Pick the right controller for the job.

CERTIFIED PERFORMANCE and VALIDATION/SUMMARY
How to make a functioning Heatseal Jaw

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