Many companies have their own procedure for starting up and shutting down an extruder or injection molding machine and, depending on the process, there may be reasons for the specific method. But from the point of view on the effect of the screw itself, the following procedure will produce the best overall results.
Extruders: defects and troubleshooting.pptxAbhijithKS36
The slide contains details of most common defects and troubleshooting(reason, causes, remedy) of polymer extruders used in industries for various types of polymer product manufacturing.
Extruders: defects and troubleshooting.pptxAbhijithKS36
The slide contains details of most common defects and troubleshooting(reason, causes, remedy) of polymer extruders used in industries for various types of polymer product manufacturing.
Injection moulding is a manufacturing technique for making parts from both thermoplastic and thermosetting. Plastic material in production molten plastic is injected at high pressure into a mould.
this file is useful for industrial and manufacturing & also for mechanical engineers & usefull for the industrial point of view
This file is about injection molding for plastics
best of luck
it is PDF are typed of myself. study triks & short & sweet (Technical manual) Of Diploma in Plastics technology(DPT-DPMT). All machine knowlage in plastics processing.
Er. Naresh Dhaker
(8890881858)
(CIPET JAIPUR)
http://www.spiratex.com/ : Understand the complete process of custom plastic extrusion with step by step details of the process through this presentation. It also explains the various specialized forms of plastic extrusions.
When a new extruder is installed, or a new screw mounted in an existing machine, do you know what the expected throughput rate is going to be? You should. If you don’t baseline your extruder, then how are you going to set realistic expectations for its performance? If extrusion screws are designed properly, they typically will be able to withstand the maximum torque available from the extruder and the resin being processed. The extruder should operate at approximately 90% of its full available torque, based on 100% pellet feedstock, which typically will be the worst-case scenario. By using today’s barrier screw technology, higher throughput rates, lower melt temperatures, and better power efficiencies can be obtained. This article will provide some basic insight to help processors to determine if they are obtaining the maximum production rates from their extruders, providing that they have adequate downstream cooling and handling equipment in the extrusion system.
Since the early 1990’s INGEO™ resins have made enormous improvements in the process ability of their bio-polymer resins. In the early days, when the resin was first being manufactured at pilot plant levels, extrusion processing of INGEO™ was very difficult.
Today, natural additives are being used to improve the process ability of these resins. Several new lubricant additive packages were tested to determine which package produced the best overall performance and process improvements. The process data was used to quantify the process ability of the various additive packages.
The data was then compared to the internal pressure data that was collected to analyze and determine the best overall additive package.
Injection moulding is a manufacturing technique for making parts from both thermoplastic and thermosetting. Plastic material in production molten plastic is injected at high pressure into a mould.
this file is useful for industrial and manufacturing & also for mechanical engineers & usefull for the industrial point of view
This file is about injection molding for plastics
best of luck
it is PDF are typed of myself. study triks & short & sweet (Technical manual) Of Diploma in Plastics technology(DPT-DPMT). All machine knowlage in plastics processing.
Er. Naresh Dhaker
(8890881858)
(CIPET JAIPUR)
http://www.spiratex.com/ : Understand the complete process of custom plastic extrusion with step by step details of the process through this presentation. It also explains the various specialized forms of plastic extrusions.
When a new extruder is installed, or a new screw mounted in an existing machine, do you know what the expected throughput rate is going to be? You should. If you don’t baseline your extruder, then how are you going to set realistic expectations for its performance? If extrusion screws are designed properly, they typically will be able to withstand the maximum torque available from the extruder and the resin being processed. The extruder should operate at approximately 90% of its full available torque, based on 100% pellet feedstock, which typically will be the worst-case scenario. By using today’s barrier screw technology, higher throughput rates, lower melt temperatures, and better power efficiencies can be obtained. This article will provide some basic insight to help processors to determine if they are obtaining the maximum production rates from their extruders, providing that they have adequate downstream cooling and handling equipment in the extrusion system.
Since the early 1990’s INGEO™ resins have made enormous improvements in the process ability of their bio-polymer resins. In the early days, when the resin was first being manufactured at pilot plant levels, extrusion processing of INGEO™ was very difficult.
Today, natural additives are being used to improve the process ability of these resins. Several new lubricant additive packages were tested to determine which package produced the best overall performance and process improvements. The process data was used to quantify the process ability of the various additive packages.
The data was then compared to the internal pressure data that was collected to analyze and determine the best overall additive package.
Plasticization rates can be greatly increased with the use of grooved feed extrusion. Grooved feed extruders can be used in a wide range of extrusion processes for higher output rates. This technology has doubled plasticization rates for some resins and processes as compared to smooth bore extruders.
This paper will compare the performance of three different screw geometries while processing fractional melt HDPE. One of the main methods of evaluation will be the comparison of internal pressure profiles over the entire length of the screw at eleven different locations down the length of the barrel at two L/D apart.
Screw and barrel inspection plays a very important part in achieving exceptional production performance. The screw and barrel are major components of extrusion, injection molding and blow molding processes, and should be measured for wear at least once a year (preferably twice a year). Many U.S. companies schedule preventive maintenance (PM) during the week of Independence Day and again during the week of Christmas.
The pipe sprayer consists of two air motors. One drives the body around the
central axis and the second drives the cup. The cup motor is set at an angle
into the body, thus as the cup revolves and body rotates a wobble motion is
set up generating a spray pattern inside the pipe. This wobble-
head action produces a reciprocating
fan pattern which enables coating to reach
the back edges formed by pit etc., in corroded
pipes. This avoids having to go through
the pipe in two directions allowing one coat
application.
The material handling of the feedstock is a very critical part of the extrusion process. If the feedstock is not introduced to the feedsection of screw in a smooth and uniform matter, then the likelihood of a stable and consistent output is unlikely. This is the reason why it is very important that if regrind is added to the virgin feedstock, it must be done very consistently and uniformly. It should also be mentioned here that a very important part of the extrusion equipment is the hopper and feedthroat section. If the hopper and feedthroat sections are not designed properly, inconsistent material flow to the screw can take place. For example, if the conical section of the hopper (see figure) does not have the proper transition, the resin will not flow smoothly into the feedthroat of the extruder.
There are basically three Coefficients of Friction (Figure 1) that take place in the feed section of the screw, (1) between the barrel and the pellet, (2) between pellet to pellet, and (3) between the root of the screw and the plastic pellet.
Screw and barrel wear is critical in all plasticating applications whether it is extrusion, injection molding, and blow molding, plus twin screw extrusion. Excessive screw and barrel wear can cause instable throughput or recovery on reciprocating screws, increased melt temperature and reduced plasticating rates.
Almost all processes, extrusion, injection and blow molding require that regrind be used in the process. Depending on the process greatly determines the amount of regrind that is generated. Some processes produce very minimal amounts of regrind, such as an injection molding process using a hot runner system versus a flat sheet extrusion process producing thermoformed sheet and the entire skeleton has to be fed back into the process or a blow molding process which always generates large amounts of regrind.
I have written in the past about screw/barrel wear and also screw rebuilding, but there are some screw and barrel shops that offer an alternative for excessive barrel wear and that is honing the barrel oversize and then rebuilding the screw oversize also to fit.
Recently a processor installed a new screw into their 6” x 32:1 L/D extruder. Within a few weeks the hard facing that had been welded on the flight OD started to pop off. (As shown in the attached photo) The flight failure was in an isolated area, so it was then assumed that the failure was due to a poor weld bond. The screw was ultra-sonically inspected and the remaining flights showed good bore, but the entire screw was rebuilt and returned to the customer.
I was recently asked to visit a facility that was a flat sheet producer to determine the cause of a major screw design problem. So, as always, I have to start at the beginning to gather all of the technical information to determine the root cause. This facility had 5 large extrusion sheet lines and they were issues with all 5 extruders...
This paper will compare the total power consumption of two different means of heating/cooling systems: air and water. For a single 90mm extruder, the total power consumption, output rate, and thermal control will be used to compare the two cooling means. Four different resins will be used.
The effects of running different barrel temperature profiles for various resinsR&B Plastics Machinery
Differences in solids conveying, screw pressure profile generation, output, motor energy required, will vary between resins, barrel temperature profiles, and resin preheat temperatures, on a single stage low compression barrier screw design.
Melt pump performance and efficiencies will vary according to the viscosity of the resin being pumped, and the discharge pressure that the melt pump will need to overcome. Resin melt temperature differences and power requirements of the pump, will vary according to the resin, and conditions that the pump will operate under.
This paper will explore the processing differences in resins on gear pump performance at different pump speeds, at three different discharge pressures. Discharge pressures on the pump will be varied keeping the suction pressure constant, thus increasing the change in pressure across the pump. Melt temperature, and pump efficiency. melt pump motor amperage, and total output, (kg/hr) will then be measured and recorded.
From time to time it is necessary to do a complete an audit on the condition of an extruder to make sure that it is operating in top condition for maximum effectiveness and efficiency. The following some general information that should be considered to accomplish a good Extruder Audit.
There are two different areas of screw design for thermoplastic composites: the screw
design which is being used to make the thermoplastic compound and the screw
design which is used to process the compounded thermoplastic. This paper
mainly discusses the latter of the two types, but many of the issues are pertinent to both.
The paper presents a fundamental study of the polymer flow within a “wave” type screw channel. The analysis is performed on an “unwrapped” form of a conventional screw channel and a “wave” type channel of similar size. A 3D Finite Element Method
(FEM) simulation was used to simulate the flow field and flow characteristics of the wave channel are compared relative to the plain channel.
Discover the innovative and creative projects that highlight my journey throu...dylandmeas
Discover the innovative and creative projects that highlight my journey through Full Sail University. Below, you’ll find a collection of my work showcasing my skills and expertise in digital marketing, event planning, and media production.
What is the TDS Return Filing Due Date for FY 2024-25.pdfseoforlegalpillers
It is crucial for the taxpayers to understand about the TDS Return Filing Due Date, so that they can fulfill your TDS obligations efficiently. Taxpayers can avoid penalties by sticking to the deadlines and by accurate filing of TDS. Timely filing of TDS will make sure about the availability of tax credits. You can also seek the professional guidance of experts like Legal Pillers for timely filing of the TDS Return.
[Note: This is a partial preview. To download this presentation, visit:
https://www.oeconsulting.com.sg/training-presentations]
Sustainability has become an increasingly critical topic as the world recognizes the need to protect our planet and its resources for future generations. Sustainability means meeting our current needs without compromising the ability of future generations to meet theirs. It involves long-term planning and consideration of the consequences of our actions. The goal is to create strategies that ensure the long-term viability of People, Planet, and Profit.
Leading companies such as Nike, Toyota, and Siemens are prioritizing sustainable innovation in their business models, setting an example for others to follow. In this Sustainability training presentation, you will learn key concepts, principles, and practices of sustainability applicable across industries. This training aims to create awareness and educate employees, senior executives, consultants, and other key stakeholders, including investors, policymakers, and supply chain partners, on the importance and implementation of sustainability.
LEARNING OBJECTIVES
1. Develop a comprehensive understanding of the fundamental principles and concepts that form the foundation of sustainability within corporate environments.
2. Explore the sustainability implementation model, focusing on effective measures and reporting strategies to track and communicate sustainability efforts.
3. Identify and define best practices and critical success factors essential for achieving sustainability goals within organizations.
CONTENTS
1. Introduction and Key Concepts of Sustainability
2. Principles and Practices of Sustainability
3. Measures and Reporting in Sustainability
4. Sustainability Implementation & Best Practices
To download the complete presentation, visit: https://www.oeconsulting.com.sg/training-presentations
"𝑩𝑬𝑮𝑼𝑵 𝑾𝑰𝑻𝑯 𝑻𝑱 𝑰𝑺 𝑯𝑨𝑳𝑭 𝑫𝑶𝑵𝑬"
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𝐓𝐉 𝐂𝐨𝐦𝐬 provides unlimited package services including such as Event organizing, Event planning, Event production, Manpower, PR marketing, Design 2D/3D, VIP protocols, Interpreter agency, etc.
Sports events - Golf competitions/billiards competitions/company sports events: dynamic and challenging
⭐ 𝐅𝐞𝐚𝐭𝐮𝐫𝐞𝐝 𝐩𝐫𝐨𝐣𝐞𝐜𝐭𝐬:
➢ 2024 BAEKHYUN [Lonsdaleite] IN HO CHI MINH
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➢CHILDREN ART EXHIBITION 2024: BEYOND BARRIERS
➢ WOW K-Music Festival 2023
➢ Winner [CROSS] Tour in HCM
➢ Super Show 9 in HCM with Super Junior
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➢ Korean Vietnam Partnership - Fair with LG
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➢ Vietnam Food Expo with Lotte Wellfood
"𝐄𝐯𝐞𝐫𝐲 𝐞𝐯𝐞𝐧𝐭 𝐢𝐬 𝐚 𝐬𝐭𝐨𝐫𝐲, 𝐚 𝐬𝐩𝐞𝐜𝐢𝐚𝐥 𝐣𝐨𝐮𝐫𝐧𝐞𝐲. 𝐖𝐞 𝐚𝐥𝐰𝐚𝐲𝐬 𝐛𝐞𝐥𝐢𝐞𝐯𝐞 𝐭𝐡𝐚𝐭 𝐬𝐡𝐨𝐫𝐭𝐥𝐲 𝐲𝐨𝐮 𝐰𝐢𝐥𝐥 𝐛𝐞 𝐚 𝐩𝐚𝐫𝐭 𝐨𝐟 𝐨𝐮𝐫 𝐬𝐭𝐨𝐫𝐢𝐞𝐬."
The world of search engine optimization (SEO) is buzzing with discussions after Google confirmed that around 2,500 leaked internal documents related to its Search feature are indeed authentic. The revelation has sparked significant concerns within the SEO community. The leaked documents were initially reported by SEO experts Rand Fishkin and Mike King, igniting widespread analysis and discourse. For More Info:- https://news.arihantwebtech.com/search-disrupted-googles-leaked-documents-rock-the-seo-world/
Falcon stands out as a top-tier P2P Invoice Discounting platform in India, bridging esteemed blue-chip companies and eager investors. Our goal is to transform the investment landscape in India by establishing a comprehensive destination for borrowers and investors with diverse profiles and needs, all while minimizing risk. What sets Falcon apart is the elimination of intermediaries such as commercial banks and depository institutions, allowing investors to enjoy higher yields.
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At its core, generative artificial intelligence relies on the concept of generative models, which serve as engines that churn out entirely new data resembling their training data. It is like a sculptor who has studied so many forms found in nature and then uses this knowledge to create sculptures from his imagination that have never been seen before anywhere else. If taken to cyberspace, gans work almost the same way.
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Looking for professional printing services in Jaipur? Navpack n Print offers high-quality and affordable stationery printing for all your business needs. Stand out with custom stationery designs and fast turnaround times. Contact us today for a quote!
Affordable Stationery Printing Services in Jaipur | Navpack n Print
Extruder or Injection Molding Machine Startup and Shutdown Article
1. Machine Start-Up & Shut-Down
How does your method affect the screw?
Many companies have their own procedure for starting up and
shutting down an extruder or injection molding machine and,
depending on the process, there may be reasons for the specific
method. But from the point of view on the effect of the screw itself,
the following procedure will produce the best overall results.
STARTUP
When starting up an extruder or injection machine that has been in
operation, it is best that all of the barrel and downstream
components have reached the set zone temperatures for a
minimum of ½ hour for machines up to about 90mm (3.5"), and 1-½
hours for large machines such as 150mm (6").
Some machine manufacturers actually preset the machine with a
"soak delay" to make sure that the equipment is not "cold started".
PROCEDURE
After all of the zones have gone through the proper soak
time, the screw rotation can be initiated.
The screw speed should not exceed 15 to 20 rpm, so as
not to damage the contact surfaces of the screw and barrel.
As soon as the screw reaches the set speed, the slide gate
on the hopper can be opened. Note: At this time, the screw
channels should be partially empty because of the shut-
down procedure which will be discussed next.
WARNING: During this time when the screw is recharging the
channels, no one should be standing in front of the die or the
injection nozzle of the equipment.
As the screw channels start to refill, the motor load will
gradually increase. This is an indication that extrudate will
be exiting the end of the die or nozzle shortly. On an
extruder, it is important to observe the head pressure
gauge during this time because it will also indicate that the
screw channels are filling.
During the recharging of the screw, any air that may have
been trapped inside the screw channels will be eliminated
during the refilling of the channels. Once a steady flow of
polymer exits the die or nozzle, the screw speed can be
increased to the desired operating speed.
SHUTDOWN
2. The shut-down procedure is just as important as the start-up
procedure for both an extruder and an injection molding machine.
By properly shutting down the equipment, the start-up will be
much quicker and most effective.
PROCEDURE
Close the hopper slide gate and stop the flow of material
into the feed throat of the equipment. On an extruder you
will notice that the drive load will start to decline. For the
injection molding process, several "air shots" can be
performed.
During this time of "running out the screw", the screw
speed should be reduced to 15 - 20 rpm so as not to
damage the contact surfaces of the screw and barrel.
When it is visible that the amount of extrudate coming out
of the die or nozzle has totally diminished, the screw
rotation can be stopped.
The feed throat cooling should remain on, unless the
equipment is going to shut down for an extended amount of
time (then it can be turned off just as the barrel zones
should be turned off). If the shutdown is only for a short
period (less than 8 hours) the screw cooling should also be
left on.
Now the equipment can be totally shut down.
REASON FOR PROCEDURE
As mentioned earlier, shutdown is very important because the main
objective is to evacuate resin from the feed section and as much of
the remaining portion of the screw as possible.
If the feed section of the screw is not evacuated, resin will begin to
melt onto the root of the screw. This will cause a melt block and
require a significant amount of time (depending on the resin) to
work itself off the root of the screw. In the extrusion process, screw
cooling will help to eliminate melt block development in most cases.
In the injection molding process, the screw should be left in the
forward position so that there is not a large inventory of resin in
front of the screw to be melted before an "air shot" can be done.
Finally, by evacuating as much of the screw as possible, the heat-
up time will occur much more quickly and reduce the risk of screw
breakage by trying to rotate the screw before all of the resin near
the discharge end of the screw has melted.