Show:
Getting Hot
What Goes On
Please Assist Me
It's What We Do
Hodge Podge
100
Cycle speed and material thickness or index length.
Oven temperature is used to adjust the sheet temperature leaving the oven. What 2 other factors can have an effect?
100
Material being pulled to other cavities and dragging over the cooled tool prior to forming.
What is the reason individual clamp tooling is used?
100
Pre stretch the material prior to form air completing the forming.
What is The purpose of a plug assist
100
Index, top platen close, bottom platen close, plug moves, vac bleed fires, form air / vacuum fire, plug retracts, air / vacuum turn off, tool starts to open, eject air fires / stripper plate moves, repeat.
What is the forming sequence as the mold closes
100
Sheet thickness variations leading to uneven heating causing material distribution issues.
What is Vee in the rails
200
True or False-Sheet leaving the oven should be hotter on the outside edges to offset the effect of the chain rails
What is False-The sheet temp leaving the oven should be the same throughout the mold shot. The oven temps are hotter on the outside edges to achieve this.
200
Part weights would be very variable..
What is What would happen if we did not utilize clamping?
200
Time is needed for the plug assist to come up to temperature.
What is Why would the first few cycles produce a different distribution in a cup?
200
True or False-Cooling effectiveness can be determined by how warm the water is exiting the tool. Warmer means better cooling
What is False-Should only show 2 deg F delta from inlet to outlet of tool for proper cooling.
200
At 15 SPM, how much time does the sheet spend in the oven?
What is 16 seconds for a 4 shot oven.
300
So heat can be applied to the area’s that need it most and make up for cool areas like chain rails. Balancing the formed shot.
What is the purpose of multiple zones in an oven?
300
Flat nose plugs tend to deposit more material into the base of the container. Pointed nose plugs – opposite.
What is How does plug shape affect material distribution?
300
Cooling the sheet in the oven prior to the next forming cycle. ( or lack of good contact in the mold for cooling the cup ).
What is The biggest problem with a form air leak
300
To assist the tool in sealing when you do not want a metal on metal contact adding stresses to the platens / framework. Cushioning effect.
What is the purpose of a bladder plate?
300
By looking for sheet sag as it exits the oven
What is How do you determine if the sheet is at the proper forming temperature?
400
True or False-The sheet picks up more heat in the last shot than the first shot.
What is False
400
Form Air due to its higher pressure.
What is What has the largest effect on forming detail, vacuum or form air? _ Why?_
400
Cooling in the mold.
What is The forming rate is limited by _________
400
Thinning of the top/lip area, caused by a ballooning effect in the mold.
What is Thinning of the top area, caused by a ballooning effect in the mold.
400
Top gets thinner / bottom gets thicker, due to the reduced resistance of the material to stretching and ease at which the form air can move the plastic.
What is Increasing sheet temperature does what to the distribution of material in the cup? _____Why? _____
500
True or False-Increasing a 800 df oven temp by 8 degrees puts 1% more heat in the sheet
What is False-Ovens are very inefficient and do not transfer an equal percentage of heat raised/lowered into the sheet.
500
To move the material off of the plug assist, blow the plastic into its final shape and hold it, under pressure against the cavity for cooling.
What is the function of form air?
500
1 – 2 seconds
What is At 15 shots/minute, roughly how much time is spent cooling the plastic?
500
Poor definition on the small radii / lettering on the container, excessive thinning at the top of a cup.
What is How would you diagnose a vac bleed valve not firing?
500
True or False-Sheet temperature can effect product weights. Why?
What is True. Expansion of the material and sheet sag affecting sheet thickness.