Discussion
In canning and retorting of foods, which of the following is the correct expression of Ball process time (B)?
Assume: \(t_{p}\) = processor’s process time; \(t_{c}\) = come-up time
Answer: A
Ball's process time is \(B = t_{p} + 0.42\,t_{c}\).
During the come-up time the retort is still heating toward its operating temperature, so this period contributes only part of the lethality of a full period at retort temperature. Ball's method credits 42% of the come-up time as if it were at retort temperature. The process time B used in Ball's formula is therefore the operator's process time, timed from when the retort reaches temperature, plus 0.42 of the come-up time.
The factors 0.30, 0.50 and 0.25 are not Ball's correction. The 0.42 assumes a retort temperature that rises roughly linearly during come-up.
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development