PKSC 4300 Exam 4
1. Select a sealant for packaging flash frozen chicken breasts for a warehouse
club. As is typical for warehouse clubs, enough product is placed into the
package for an army. The fill weight is 3 pounds. The chicken is flash frozen
at temperatures of -40 C prior to packaging. It runs on a VFFS line whose
temperature goes high enough to run any of the films above. Explain your
answer.: Surlyn; since this will be a VFFS line with a heavy product, it is important to have good hot tack. Also, since
the chicken will be frozen and at -40 C before packaging, we don't want the cold chicken to make the seals brittle, so
we need a Tg well before zero.
2. Select a sealant for an oatmeal pouch. Product sells cheap at the stores, so
cost is an issue. Fill weight is one ounce. The pouch runs on a high speed HFFS
and runs at 600 packs per minute. The seal temp is 175 C. At these speeds, even
1/8
,though the seal jaw is so hot, sealant temp is much lower, around 125 C. There
is also powder everywhere due to the speeds. Explain your answer.: LDPE; this is the
second cheapest option, and with a Tm of 106 C we will be sure that a seal will be made with this seal jaw. Also, this
has some ability to seal through contamination, which is important since powder is everywhere.
3. Use graph on desktop.
This is what kind of graph?: Seal curve
4. Use graph on desktop.
Match the following descriptions for items A-D.
-in this region, the system may have degraded in one way or the other
-Likely peelable, but not that stable with respect to T
-In this region, the system is the most stable
-This is the MST or SIT: -D
2/8
, -B
-C
-A
5. Use graph on desktop.
In this curve, our stable range is about: 30 degrees wide
6. Use graph on desktop.
What do the letters in MST stand for?: Minimum Seal Temperature
3/8
1. Select a sealant for packaging flash frozen chicken breasts for a warehouse
club. As is typical for warehouse clubs, enough product is placed into the
package for an army. The fill weight is 3 pounds. The chicken is flash frozen
at temperatures of -40 C prior to packaging. It runs on a VFFS line whose
temperature goes high enough to run any of the films above. Explain your
answer.: Surlyn; since this will be a VFFS line with a heavy product, it is important to have good hot tack. Also, since
the chicken will be frozen and at -40 C before packaging, we don't want the cold chicken to make the seals brittle, so
we need a Tg well before zero.
2. Select a sealant for an oatmeal pouch. Product sells cheap at the stores, so
cost is an issue. Fill weight is one ounce. The pouch runs on a high speed HFFS
and runs at 600 packs per minute. The seal temp is 175 C. At these speeds, even
1/8
,though the seal jaw is so hot, sealant temp is much lower, around 125 C. There
is also powder everywhere due to the speeds. Explain your answer.: LDPE; this is the
second cheapest option, and with a Tm of 106 C we will be sure that a seal will be made with this seal jaw. Also, this
has some ability to seal through contamination, which is important since powder is everywhere.
3. Use graph on desktop.
This is what kind of graph?: Seal curve
4. Use graph on desktop.
Match the following descriptions for items A-D.
-in this region, the system may have degraded in one way or the other
-Likely peelable, but not that stable with respect to T
-In this region, the system is the most stable
-This is the MST or SIT: -D
2/8
, -B
-C
-A
5. Use graph on desktop.
In this curve, our stable range is about: 30 degrees wide
6. Use graph on desktop.
What do the letters in MST stand for?: Minimum Seal Temperature
3/8
