What is Sealing: Definition and 25 Discussions

Induction sealing is the process of bonding thermoplastic materials by induction heating. This involves controlled heating an electrically conducting object (usually aluminum foil) by electromagnetic induction, through heat generated in the object by eddy currents.
Induction sealing is used in many types of manufacturing. In packaging it is used for package fabrication such as forming tubes from flexible materials, attaching plastic closures to package forms, etc. Probably the most common use of induction sealing is cap sealing, a non-contact method of heating an inner seal
to hermetically seal the top of plastic and glass containers. This sealing process takes place after the container has been filled and capped.

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  1. berle

    Is it possible to use radial seals on non-circular cross sections?

    Hi everyone, I am in the process of designing a watertight enclosure for 300m deep applications and would like to explore options of using radial o-ring seals in place of face-seals due to space-savings. However, i am unable to find any information anywhere on using radial seals on non-circular...
  2. A

    Electronics Need help sealing my 775DC 30,000 rpm motor shaft

    Hi, I need help finding a way to seal my 775DC 30,000 rpm 5mm motor shaft going into my pump housing I built. This motor will run once a week for up to 5 minutes. The pump with have air and water in it. I will rarely ever be completely filled with water. So, the pump will mainly be pushing...
  3. Shees

    Mechanism to Automatically Lower Heater for Sealing Packaging

    Hi i need a mechanism to lower the heater to certain height then it will automatically go up. It could be auto or manual hand mechanism. In short i need a mechanism which is installed in drill press table machine to lower drill bit. But in my scenario it is heater to seal small packaging of...
  4. Roy S Ramirez

    Depth of NPT Holes: How to Fully Screw in Fittings Roy's Q&A

    Hello everybody! I've notice that when using NPT fittings, the female fittings usually doesn't take all of the male threads: This has never bothered me since these are commercial fittings and the engineers who designed them know what they are doing. But now, I need to make NPT holes in a...
  5. E

    Chemically resistant sealing options

    Does anyone have any experience with FFKM sealing solutions? I am looking for rubber seals to be used in the chemical processing industry and would need material that has high chemical resistant properties. I've done some research online and found something called TRPlast which has a similar...
  6. SirMarx01

    Automotive What is the compression force of a ring seated inside a cylinder

    Hello. I am finding out how many normal force between ring and cylinder. I try to find around for many hours but get noting. there are 8.2 mm inner diameters than put in 8.6 mm cylinder. The hardness of sealing element is 55 ShA. Contact area is 48.63 mm^2. I have data and drawing in attachment...
  7. J

    How is a plate with a hole in it sealed

    Say I have a simple 2 or 3mm thick sheet of plexiglass or aluminum, and I have a closed chamber box out of these sheets. Now, I want to build a pressure inside the chamber, but the prototype only has a simple O shaped "hole" on the box. I can choose the diameter of the hole, and I have a rubber...
  8. mbewley59

    Sealing a wiring port to withstand water at 130+ psi?

    Hey everyone- I'm designing an ROV thruster which, for starters, will operate down to a depth of 300 feet. My problem is that I can't find any information regarding an electrical port which can pass through the hull out into the pressurized atmosphere without leaking. This will be a 12v system...
  9. R

    Need advice on pinch-off tool for cold cold-weld sealing

    Hi, My name is Rodrigo and I need to achieve a permanent seal for a vacuum chamber in the high vacuum range (I’ll be working between 1x10-4 and 1x10-torr). We were thinking of using a cold-weld sealing of an annealed copper tube to separate the chamber from the vacuum pump once the vacuum level...
  10. B

    Heat affect on sealing tape adhesive strength

    There's a reel of material which has splices connected by regular transparent sealing tape. The bobbin has to be heated for manufacturing. Do you think the heat of up to ~60C degrees could have an affect on tape adhesives?
  11. P

    Material for Sealing: O-Rings & Shaft Seals for Marine Use

    Hello, I would need help. Need help choosing the material for sealing: o-ring, shaft seal. They will use the equipment that will be installed on board a seagoing ship. The conditions are: - Resistant to seawater - Withstand temperatures of -32 ° to + 60 ° or -25 ° to + 60 ° - And chemical...
  12. T

    Sealing a 6 torr closed system vacuum

    I wish to design a two chamber stainless steel vacuum system where the two vacuum chambers are connected via a flexible tube with a valve. The system needs to be able to be pumped down to 6 torr and must be able to maintain that vacuum for at least a year without pumping. The size of the...
  13. G

    Fastener spacing and sealing with o-rings

    I have to seal a spherical container comprised of 2 hemispheres joined together with a bolted flanged connection. I plan on using o-rings to seal the liquid (water) in. The problem I am having is finding the minimum number of bolts required to compress the o-ring and seal the joint. Can anyone...
  14. P

    Sealing Hellium at Higher Temperatures: Possible Solutions?

    Hellium leaks through all normal seals. I've used Indium seals to get leak rates down as low as 0.0000000001 grams/sec, but that only works for normal ambient temperatures. (Customer requirements were no greater than ten to the minus six grams/sec. The Indium seals were orders of magnitued...
  15. D

    Sealing a low-vacuum closed system

    I've been researching this for quite a while and feel somewhat exasperated, so I thought I would ask more knowledgeable folk. I need to seal a closed system for low vacuum, and I need to do it on a budget. My problem is that most of the information I have found deals with much higher vacuums...
  16. T

    Looking for Hermetic Sealing Vendors for Glass and Exotic Metals?

    i work at a company that outsources Hermetic Sealing. i was wondering if anyone knows of any vendors that would be able to do glass sealing with exotic metals?
  17. Q

    What is the sealing mechanism of UHV view ports & electrical interconnects?

    Knife edges on the edges of flanges with a maleable material gasket like copper is often used for creating UHV chamber environments. For UHV view ports, typically say quartz or some other material, how is the UHV seal accomplished? Is it the same mechanism? E.g. knife edges machined on...
  18. D

    Rotating Fitting for 70 PSI Air Supply at 30000 RPM

    I am currently looking to push air through a middle hole in a 60mm dia shaft traveling at 30000 Rpm, the pressure i require is 70 PSI. I am looking for a rotating fitting that can be threaded into the end so the air supply can be attached. Can someone point me in the right direction or tell me...
  19. kandelabr

    Sealing with two hard, flat surfaces

    Imagine the following scenario: There is a hollow steel cube. I cut the top facet off so that I get a box with a lid and then polish both cut surfaces so that geometry fits almost perfectly (no gaps are larger than 1/100 of a milimeter or so - or even smaller). Then I close the box and...
  20. R

    Sealing Concrete | Can Xiameter Silicone Fluids Help?

    Hi there, I was wondering if [PLAIN]"www.xiameter.com/en/ExploreSilicones/Silicone-Fluids/Pages/polydimethylsiloxane-fluids.aspx"[/URL] can be used to seal concrete?
  21. M

    High Performance Sealing Options (Turbomachinery)

    Let's say you have a turbojet shaft that needs sealed. Temperatures and pressures are very high (very). Now let's assume that you don't know squat about seals. Aside from brush and labby seals, what other sealing options exist that can operate at extremely high pressures/temperatures (and...
  22. M

    PTFE and ME (or Machining & sealing of Teflon)

    Sorry for the title, I liked the pun. I would like to hear thoughts on anyone who has worked with Teflon either machining or for gasketing. I have never touched teflon aside from it being a coating but will get to machine and work with some this week. Most of the information I find online...
  23. gmax137

    Can drilling holes in piston rings improve sealing pressure in race engines?

    I had someone telling me about drilling small holes, down from the piston crown into the small space "behind" the top piston ring, purportedly to allow the combustion pressure to get into that space and force the ring out against the cylinder wall. The theory is that the gap between the top...
  24. M

    Sealing a chemical Reaction in furnace(Final Beng mechanical Eng. project)

    HELP NEEDED Sealing chemical Reaction in furnace(Beng mech Eng. project) Hello everyone, I had posted a similar thread earlier, got a few responses, but nothing enough to drive me out of my problem, even my project supervisor at Uni of Notts is confused...
  25. Pengwuino

    Dangerous Outcome of Sealing Dry-Ice in Box

    Ok let's see... what would happen if i completely sealed up a box with a block of CO2 in it (with room to evaporate). My hypothesis is I create an incredibly dangerous pressurized box ready to kill someone. Am I right?