Hot bar temperature

HB Hot bar temperature CB Cold bar temperature DT Dwell time P Pressure... 

Abbreviations. QA, cooling air pressure CB, cold bar temperature DT, dwell time HB, hot bar temperature MT, material temperature P, pressure RT, room temperature SD, standard deviation SS, seal strength TH, material thickness. 

Figure 4 Contour plot of burn percent defective. Abbreviations. DT, dwell time HB, hot bar temperature.

This requires performing capability studies and life testing on the different critical inputs. For hot bar temperature, a temperature transducer was installed to continuously record the temperature. The temperature range over several extended runs varied 6°F up and down from the set point. The range of 12°F is based on continuous measurement of the temperature giving thousands of readings and should conservatively contain... 

Figure 5 Tolerance analysis when hot bar temperature = 175, dwell time = 0.5, pressure = 100, and materials temperature = 70. Abbreviations LSL, lower spec limit T, target USL, upper spec limit.

Henry and McUmber (1977) reported on the systems R-22 -water and R-22-oil. They constructed an apparatus in which R-22 could be poured into water or mineral oil at various ambient pressures controlled by the pressure of argon gas in the system. Separate units were used for the water and oil tests. They demonstrated that they could achieve thermal explosions at 1 bar, in agreement with earlier tests (see Section VII). However, no such events were observed at system pressures of 2.2 or 8 bar even though the hot liquid temperature was varied over a wide range. 

Impact Sensitivity, Hot Bar ignition Temperature and Vacuum Stability (Ref 3c)... 

Note 3 Hot bar and other methods for determining ignition (or explosion) temperature are described in the following refs Refs 1) A.P. Sy, JFrankllnst 155, 171 (l 903) (Early US Ordnance method, also described in Refs 2 4) 2) Marshall 2 (l917), 434-35 (same method as in Ref 1) 3) Marshall 2 (1917), 435 (Hot bar method) 4) Reilly (1938) 83 (same method as in Ref 1 is listed as Deflagration Test) 5) PATR 2700, Vol 1 (1960) pp XVl XVII (description of two tests and list of 11 refs) 6) AMCP 706-177 (1971), p 3 (current US Ordnance Explosion Temperature Determination) 7) PATR 2700, Vol 6 (1973) p E387-R (Explosion Temperature)... 

The heat sealer works by pinching the material to be sealed between two bars. The top bar, called the hot bar, provides heat to melt the plastic material, causing it to flow together to form the seal. The top bar also moves up and down to allow the material to be moved. The bottom bar is stationary and has cooling water mnning through it, allowing its temperature to be controlled. 

A66rei iaijons AQL, accepted quality level DT, dwell time HB, temperature hot bar MT, material temperature P, pressure. 

Figure 7. Hot-tack strength ofAFFINITY POP and EVA resins as a function of seal-bar temperature. Nylon/EAA/Sealant (I/I/1.5 mil) blown co-ex film was used. (Reproduced with permission from reference 25. Copyright 2002 Taylor and Francis Group, LLC.)...

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