tag:blogger.com,1999:blog-56656471286273056012026-04-12T05:15:32.452-07:00hasnanhttp://www.blogger.com/profile/02590952024515915629noreply@blogger.comBlogger88125tag:blogger.com,1999:blog-5665647128627305601.post-14458342810336067832017-09-17T06:15:00.000-07:002017-09-17T06:15:12.504-07:00

this type of defect is caused by A molded product that is incomplete because the mold cavity was not filled completely. If a part short shots, the plastic does not fill the cavity. The flow freezes off before the flow paths have completely filled. commonly the main caused could device in two main problem One of these occurs because, in the middle of the flow of the molten plastic

hasnanhttp://www.blogger.com/profile/02590952024515915629noreply@blogger.com55tag:blogger.com,1999:blog-5665647128627305601.post-91299824341223973762012-07-21T20:30:00.001-07:002012-07-21T20:30:38.348-07:00

Various way available to calculate cooling time in injection mould, the easiest way of course using numerical method, software package like mold flow, C - mold or your own compile numerical method language also available in the market, for detail and specific calculation, i suggest to write your own equation base on the problem, after that write in the programming language and understanding the

hasnanhttp://www.blogger.com/profile/02590952024515915629noreply@blogger.com86tag:blogger.com,1999:blog-5665647128627305601.post-46974783130743116562012-07-21T17:56:00.001-07:002012-07-21T17:56:25.782-07:00

Jetting occurs when polymer melt is pushed at a high velocity through restrictive areas, such as the nozzle, runner, or gate, into open, thicker areas, without forming contact with the mold wall. The buckled, snake-like jetting stream causes contact points to form between the folds of melt in the jet, creating small-scale "welds". Jetting leads to part weakness, surface blemishes, and a

hasnanhttp://www.blogger.com/profile/02590952024515915629noreply@blogger.com30tag:blogger.com,1999:blog-5665647128627305601.post-51242090266124108862012-06-03T23:29:00.000-07:002012-07-21T17:53:45.305-07:00

this post shows the flashing process occurs in the injection mold, in fact many things that influence the occurrence of the flash, but can be broadly divided into 3 1. material effect 2. Influence of the injection mold 3. Effect of mold conditions for example, due to the influence of material, rubber and PP is certainly more difficult to control defects in flash because it has a low viscosity

hasnanhttp://www.blogger.com/profile/02590952024515915629noreply@blogger.com25tag:blogger.com,1999:blog-5665647128627305601.post-86624540680688406542012-05-02T16:46:00.001-07:002012-05-02T16:47:33.840-07:00

I found a great video from youtube, although it was on youtube a while, but this video deserves to be given the thumbs. in this video can be seen clearly how the process of formation at the injection mold part to work, well we'll find out in detail the process of melting and movement of the screw on the injection machine

hasnanhttp://www.blogger.com/profile/02590952024515915629noreply@blogger.com48tag:blogger.com,1999:blog-5665647128627305601.post-57341637156409409202012-04-07T23:37:00.000-07:002012-04-07T23:37:02.799-07:00

rapid heat temperature, is actually an old method that is often used to eliminate the weld line, the front cover products such as TV, is an example of the most frequently used method, but its use is now developed further, as demand for products with low cycle time and quality of surface nice sharp increase lately, covering progress being made is that the control system is used, so the heat on the

hasnanhttp://www.blogger.com/profile/02590952024515915629noreply@blogger.com66tag:blogger.com,1999:blog-5665647128627305601.post-49672652272015485882012-03-23T17:34:00.002-07:002012-03-24T16:28:15.269-07:00

Cooling is most important parameter when talking about cycle time reduce, some of my friend who very interest in injection mould still confuse how to design cooling system in injection mould, before talking about optimal design, first we must be familiar with the term and design standard that will be used. Basic Cooling Layout in principle, the more uniform temperature in the cavity,

hasnanhttp://www.blogger.com/profile/02590952024515915629noreply@blogger.com11tag:blogger.com,1999:blog-5665647128627305601.post-80443688277173143512012-02-10T00:28:00.000-08:002012-02-10T00:47:02.427-08:00

venting is a small part of the mold design, on the design process also requires a very short time, perhaps only 10% or less of the total time required in designing.sometimes is frequently neglected until molding trials indicate mold inadequacies related to venting. if we understand the purpose and function of vents, it's can assists mold designer to design where clearly additional vents required.

hasnanhttp://www.blogger.com/profile/02590952024515915629noreply@blogger.com9tag:blogger.com,1999:blog-5665647128627305601.post-18777687515295000492011-11-21T15:58:00.000-08:002011-11-21T16:01:55.590-08:00

one common way used in the ejection system for an internal screw is used collabsible undercut core, which requires collabsible core product generally has the undercut on the inside, for example an internal screw, pipe fittings, elbow pipe, use collabsibe core is not only on the core course , undercut the slider is also often used collabsible cores. video below gives a simple explanation of how

hasnanhttp://www.blogger.com/profile/02590952024515915629noreply@blogger.com7tag:blogger.com,1999:blog-5665647128627305601.post-28586186638128780962011-06-29T16:58:00.000-07:002011-06-29T16:59:59.241-07:00

in designing the runner, first-time we must consider items that affecting  runnersize, some of which - Volume of part, the greater the volume takes a larger diameter runners anyway. - Weight of part, the heavier parts, it takes a larger diameter runners. - Plastic materials, plastic materials with low viscosity, aqueous requires a smallerdiameter runner. - Wall thickness, the thicker the

hasnanhttp://www.blogger.com/profile/02590952024515915629noreply@blogger.com14tag:blogger.com,1999:blog-5665647128627305601.post-21538162132452867242011-03-07T15:35:00.000-08:002011-03-07T15:35:18.694-08:00

Plate transfer process occurs during the machining and assembly of mold, both for the cavity and mold base plate, especially for the plate with a weight greater than 20 kg, threaded hole necessary to facilitate the transfer process. cause may be in a mold plate having a various of machining processes with different types of machines. Base on position of hole the type of lifting bolts can divided

hasnanhttp://www.blogger.com/profile/02590952024515915629noreply@blogger.com9tag:blogger.com,1999:blog-5665647128627305601.post-47917727521307274902011-02-07T05:21:00.000-08:002011-02-07T05:36:55.233-08:00

Runner components between the two mold plate and three plate mold because there are different functions of these components, but there are several components that can be used in general without looking at the type of mold construction. 1.Runner lock pin The main function of the runner lock pin (RLP) is an pulling runner so the gate can be disconnected/cut from the product, RLP fitted with a

hasnanhttp://www.blogger.com/profile/02590952024515915629noreply@blogger.com5tag:blogger.com,1999:blog-5665647128627305601.post-44648747951446779262010-12-22T08:05:00.000-08:002010-12-22T08:05:40.333-08:00

moldbase sometimes can be used for the locking block on the slider unit, this is basedon several reasons, for example, to reduce cost, by reducing the insert locking block, the other reason is required surface area for the locking block. illustration picture above shows the angular pins are bolted to the mold base and the mold base made pocket instead of locking block, to keep the process

hasnanhttp://www.blogger.com/profile/02590952024515915629noreply@blogger.com5tag:blogger.com,1999:blog-5665647128627305601.post-33362808078254896792010-11-21T08:40:00.000-08:002010-11-21T08:57:08.698-08:00

Picture above shows the loose core, or often also called slope ejectors or inclined pin, loose cores is one method to overcome the undercut on the product, particularly undercut the core position facing into the bottom (towards the sprue bush-center of mold) that undercut it can not be made simply by using slider method, part of the loose core complete with mold base include: 1. Top clamping

hasnanhttp://www.blogger.com/profile/02590952024515915629noreply@blogger.com12tag:blogger.com,1999:blog-5665647128627305601.post-77014578807429750472010-11-12T11:52:00.000-08:002010-11-12T11:54:05.605-08:00

one way to release the undercut is to loose cavity, the opposite of loose cores, loose inner cavity is used to remove the undercut in the cavity area, note the image below for more details, 1 = top plate 2 = runner stripper plate 3 = cavity plate 4 = core plate 5 = locking block for loose cavity 6 = angular pin for loose cavity system 7 = loose insert cavity   some designers also say that

hasnanhttp://www.blogger.com/profile/02590952024515915629noreply@blogger.com8tag:blogger.com,1999:blog-5665647128627305601.post-79786414793706271902010-10-02T17:27:00.000-07:002010-10-02T17:27:22.252-07:00

it's difficult to list all company that provide any solution about injection machine, include manufacturer, injection molder, machine maker, and injection design, based on the survey is limited to friends and colleagues associated with the injection mold, which many ads appear on Google, and companies that contribute most in the book and seeing appear in the books of injection mold, here I will

hasnanhttp://www.blogger.com/profile/02590952024515915629noreply@blogger.com83tag:blogger.com,1999:blog-5665647128627305601.post-46142171112135232742010-08-17T02:09:00.000-07:002010-08-17T10:23:27.335-07:00

Uniform wall thickness in plastic part design is critical.Non-uniform wall thickness can cause serious warpage and dimensional control problems.One of the easiest ways to cure this problem is change the part geometry by adding ribs. The use of ribs is a practical way and economical means of increasing the structural strength of a part.  it is more economical to use ribs than increase wall

hasnanhttp://www.blogger.com/profile/02590952024515915629noreply@blogger.com3tag:blogger.com,1999:blog-5665647128627305601.post-78461876486642458842010-08-02T15:53:00.000-07:002010-08-02T15:57:22.941-07:00

What should you do when the slider design and found that the angular slider too long? There are many ways to change the design so that the angular length of the slider pins are still reasonable when compared to its diameter.in design between the angular diameter and length of the slider pins should be noted, the length of angular slider pins that are too long can lead to easily broken when

hasnanhttp://www.blogger.com/profile/02590952024515915629noreply@blogger.comtag:blogger.com,1999:blog-5665647128627305601.post-23552880528008460042010-06-26T11:34:00.000-07:002010-08-10T14:28:52.491-07:00

posts related to construction and part-bagianya slider has been my post, about the cooling on the slider, the basic construction for the slider, the slider and the main part, please see previous post to learn the basic construction and when we should use the slider, This post will discuss about when we need to use of the slider that use angular pin or just cam slider, what advantages and

hasnanhttp://www.blogger.com/profile/02590952024515915629noreply@blogger.comtag:blogger.com,1999:blog-5665647128627305601.post-85469024934328739242010-05-09T11:25:00.000-07:002010-05-09T11:25:33.772-07:00

Warping, Part Distortion is shows up as parts being bowed, warped, bent or twisted beyond the normal specification outlined on the drawing.Warpage occurs when there are variations of internal stresses in the material caused by a variation in shrinkage. Warped parts may not be functional or visually acceptable. Main Causes1.Non-uniform cooling Temperature differences from one side of the mold to

hasnanhttp://www.blogger.com/profile/02590952024515915629noreply@blogger.com2tag:blogger.com,1999:blog-5665647128627305601.post-49838455087535436062010-03-24T07:48:00.001-07:002010-03-24T10:28:34.477-07:00

In manufacturing, the Weld line or Knit line or Meld line is the line where two flow fronts meet when there is the inability of two or more flow fronts to "knit" together, or "weld", during the molding process. These lines occurs usually around holes or obstructions and cause locally weak areas in the molded part. A weld or meld line is a weakness or visible flaw created when two or more flow

hasnanhttp://www.blogger.com/profile/02590952024515915629noreply@blogger.com5tag:blogger.com,1999:blog-5665647128627305601.post-10919274868102768612010-03-03T04:10:00.000-08:002010-03-03T07:35:17.015-08:00

The term "short shot" or "short mold" is used to refer to a phenomenon where plastic being injection molded does not reach certain portions of the inside of the die before solidifying. or it means that not enough resin has flowed into the mold to fill it adequately. The main causes for short shot are the mold condition or flowability problems with the resin. The problem is alleviated when a

hasnanhttp://www.blogger.com/profile/02590952024515915629noreply@blogger.com4tag:blogger.com,1999:blog-5665647128627305601.post-49130764565664337572010-02-19T07:09:00.000-08:002010-02-19T09:28:06.791-08:00

In ejector system, return pin is important, i was post about ejector system, include the function of each part, see it at this link, previous post is adding ejector pin and ejector guide bush in the mold, now next step is adding return pin, when we use mold standard or mold base blank, return pin always include in those mold base blank, if you have the catalog, return pin symbol is always RP,

hasnanhttp://www.blogger.com/profile/02590952024515915629noreply@blogger.com7tag:blogger.com,1999:blog-5665647128627305601.post-41777023492427804822010-01-30T04:23:00.000-08:002010-01-30T07:54:25.122-08:00

Ejector Guide Pin and Bushin this part, we will design ejector guide pin, EGP bush, bolts for stripper plate and bottom plate. first learn ejector system and part at link below3D ejector drawinghope you can understand ejector system and ejector guide pin (EGP) function, Ejector guide pin located between ejector plate and ejector stripper plate, to fit the ejector pin, we can add bolt at the

hasnanhttp://www.blogger.com/profile/02590952024515915629noreply@blogger.com4tag:blogger.com,1999:blog-5665647128627305601.post-78243619912285014132009-09-13T08:17:00.000-07:002009-09-13T09:41:24.714-07:00

now, after put sprue bush and locating ring at top plate, let's design core side, like cavity block, core block also need bolts to attach the core block to core plate, see picture belowat those picture i use M10 bolts type, this bolts use to attach the core block to mold base plate, don't forget to give chamfer of each side of core bolts, this chamfer very useful in assembly mold processing, this

hasnanhttp://www.blogger.com/profile/02590952024515915629noreply@blogger.com9