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expand and take the shape of the mold walls, after which the mold is moved to its cooling position. The
other mold is now open and is moved to the position where it surrounds the parison and the cycle repeats.
The machine and parison program cycle is started by the knife cutting the parison. Program start Delay
time may be used to properly position the programmed parison profile relative to the mold profile to insure
constant wall thickness.
ACCUMULATOR MACHINES
2-2-4.
Accumulator blow molding machines are normally used to make large containers. Plastic is extruded into an
accumulator until the amount required (Shot Size) to make the container is available. When the mold is
positioned to receive the parison the accumulator piston moves, extruding the plastic through the pro-
grammable die gap to form the parison.
A position transducer measures the accumulator piston motion and causes the parison profile to be con-
trolled as a function of the volume of plastic extruded through the die gap. During filling, the transducer also
causes the accumulator to stop filling when Shot Size is achieved.
PARISON PROGRAMMING BENEFITS
2-2-5.
If the die mandrel gap is constant, the extruded parison wall thickness is constant.
When the parison is expanded by air pressure, it is stretched and made thinner.
The resulting container walls contain thick and thin portions depending upon the
amount of parison stretching occurring during the inflation of the container.
When this container is filled with a test fluid and dropped, it is likely to split in the
heavy wall areas upon impact, due to reduced material strength resulting from
uneven cooling stress. The entire container must be made thicker or more uni-
form to provide even cooling and improved strength.
As a result the container walls will be heavier throughout the container, require
a long cooling time, material cost will increase and container production rates
will decrease.
If the parison container thickness can be programmed as it is extruded by
varying the die mandrel gap width, the resulting container will have constant
thickness walls.
© MOOG 2010
This document is subject to MOOG INTELLECTUAL AND PROPRIETARY INFORMATION LEGEND . The details are on page II.
Figure 2-1 Section of an Un-programmed Parison
and the Resulting Container Walls
Container
Wall Profile
Figure 2-2 Section of a Programmed Parison
44
Un-programmed pa-
rison
Container
Wall Profile
Programmed
parison
and the Resulting Container Walls
MRJ04410
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Need help?
Do you have a question about the DigiPack Ⅱ and is the answer not in the manual?
Questions and answers
How..to set up the..Digi pack 2 on machine
To set up the Moog DigiPack II on a machine, follow these key steps:
1. Installer Requirements: The installer must be familiar with electrical wiring, hydraulic plumbing, basic metal work, and have some understanding of the blow molding process. Use of test instruments like a digital voltmeter is also required.
2. Mechanical Installation:
- Install and adjust tooling and die gap actuators.
- Mount the servovalve and manifold.
- Install the hydraulic cylinder and ensure it meets customer specifications.
- Measure and set accumulator position.
- Ensure proper filtration and install filters.
- Connect the hydraulic power supply and follow startup instructions.
- Implement contamination control.
3. Electrical Installation: Follow the manual's guidance for electrical connections.
4. Software Update (if needed):
- Power off DigiPack II and remove the SD card.
- Save the “DIGIPK2.FWM” file to the SD card using a PC.
- Reinsert the SD card and power on the unit.
- Press “X10” and “Cursor Down” keys simultaneously during startup.
- Wait for the “Updating firmware……” message.
- Confirm update by checking the software version on the startup display.
5. Calibration and Setup:
- Set accumulator working stroke, shot size, and end position.
- Interface DigiPack II with the machine’s PLC for motion control.
Proper installation following the manual ensures reliable long-term operation.
This answer is automatically generated
The shot size is to short and the Digi pack to is not in command..
If the shot size is too short and the Moog DigiPack II is not functioning properly, turn the Entry Knob clockwise to increase the Shot Size value on the LCD display. Then press the Set button to make the change permanent.
This answer is automatically generated