tag:blogger.com,1999:blog-8070206702893528832012-02-16T03:30:16.125-08:00information and education in the field of polymer and plastic engineering and processingazhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comBlogger1771100tag:blogger.com,1999:blog-807020670289352883.post-81768844982776839282009-07-25T10:09:00.000-07:002009-07-25T10:10:16.789-07:00

Process - A set of conditions or set of causes working together to produce an outcome.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-81789274888959350562009-03-29T15:00:00.000-07:002009-03-29T15:00:00.200-07:00

Polypropylene - A tough, light-weight polyolefin plastic made by the polymerization of high-purity propylene gas in the presence of an organometallic catalyst at relatively low pressures and temperatures.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-59985702818412681572009-03-28T14:57:00.000-07:002009-03-28T14:57:00.679-07:00

Polymerization - A chemical reaction in which the molecules of a monomer are linked together to form large molecules whose molecular weight is a multiple of that of the original substance.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-51132228628431626382009-03-27T14:56:00.000-07:002009-03-27T14:56:00.529-07:00

Polymer - A high-molecular weight organic compound whose structure can be represented by repeated small units.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-45365156466576573912009-03-25T14:53:00.001-07:002009-03-25T14:53:00.991-07:00

Polyethylene - A polyolefin composed of polymers of ethylene. Exists in three classes: low, medium and high density.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-41219326201460826932009-03-25T14:51:00.000-07:002009-03-25T14:51:00.280-07:00

Polycarbonate Resins - Polymers derived from the direct reaction between aromatic and aliphatic dihydroxy compounds with phosgene or by the ester exchange reaction with appropriate phosgene- derived precursors.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-75289314035473856512009-03-24T14:50:00.000-07:002009-03-24T14:50:00.774-07:00

Rotary Clamp - A clamp in which the platens and mold are moved to close about an extruded parison and then said molds are rotated away from the parison center line. More than one platen is moved and the rotation can be horizontal or vertical, with the blowing devices rotating with the clamp.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-5745684884013921472009-03-23T14:47:00.000-07:002009-03-23T14:47:00.546-07:00

Programmed Parison - Changes in shape and wall thickness of a parison at predetermined points along the length of the parison.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-64867850771692879402009-03-23T14:43:00.000-07:002009-03-23T14:43:00.525-07:00

Preform Rod Holder (Core) - One for each station of injection blow molding machine = holds preform rods.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-24929246231515531372009-03-22T14:36:00.000-07:002009-03-22T14:36:00.272-07:00

Preform Rod (Core Pin, Core Rod) - Internal member of preform (injection) cavity which is used to transfer preform to blow mold.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-87239150132195178512009-03-22T06:24:00.000-07:002009-03-22T06:24:00.488-07:00

Preform Cavity (Injection Cavity) - Together with preform rod, forms preform.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-36768525234108740022009-03-22T06:23:00.000-07:002009-03-22T06:23:00.977-07:00

Pre pinch - Closing off an open end of the parison, before the molds pinch is together. Often used in connection with pre blow.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-56399093811871415922009-03-21T06:22:00.000-07:002009-03-21T06:22:00.622-07:00

Pre Close - Closing the molds (platen) to some point nearer the closed position before final closing on the parison.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-80996492168709804612009-03-21T06:21:00.000-07:002009-03-21T06:21:00.122-07:00

Pre Blow - The injection of a medium into a closed parison before the molds close.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-82546452024955033352009-03-21T06:20:00.000-07:002009-03-21T06:20:00.876-07:00

Platen Speed - The closing/opening speed of a platen movement in inches per second (or cm/sec).

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-28829327463875812172009-03-20T14:53:00.000-07:002009-03-20T14:54:10.382-07:00

Polyethylene - A polyolefin composed of polymers of ethylene. Exists in three classes: low, medium and high density.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-68560428965499609292009-03-20T14:45:00.000-07:002009-03-20T14:46:27.847-07:00

Programmed Die Head - A die head with provision for variation of orifice opening at specific points during parison ejection so as to program the parison.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-84396034680226275242009-03-20T06:17:00.000-07:002009-03-20T06:17:00.840-07:00

Platen Daylight - Open - Maximum and Minimum open distance; closed - Maximum and Minimum shut distance.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-18354752290280218912009-03-20T06:16:00.000-07:002009-03-20T06:16:00.281-07:00

Injection molding machine platen - The plates on which the mold assembly is mounted. Large metal blocks on clamping ends of a molding machine used to support the mold.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-79401265771032391202009-03-20T06:15:00.000-07:002009-03-20T06:15:01.003-07:00

Plasticize - To soften a material and make it plastic or moldable, either by means of an extruder or by heat or both.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-40086088187858489252009-03-19T06:14:00.000-07:002009-03-19T06:14:00.750-07:00

Plastic Shut Off Valve - A valve used to shut off plastic flow, usually mounted in a manifold.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-53739691333426100362009-03-19T06:13:00.000-07:002009-03-19T06:13:00.090-07:00

Screw pitch - Distance in an axial direction from the center of a flight at its periphery to the center of the next flight. In a single flighted screw “pitch” and “lead” will be the same, but they will be different in a multiple flighted screw.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-47697506792510451122009-03-19T06:12:00.000-07:002009-03-19T06:12:00.201-07:00

Pinch off - Those sections of a parison which are not taken within the cavity of a mold, and which are removed after blowing.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-23319907123515349152009-03-18T06:11:00.000-07:002009-03-18T06:11:00.192-07:00

Pin (Mandrel) and Bushing (Die) Banks - The maximum pin (mandrel) size and minimum bushing (die) size supplied unfinished.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-63261246236603555272009-03-18T06:10:00.001-07:002009-03-18T06:10:01.437-07:00

PET - Polyethylene Terephthalate, known as a thermoplastic polyester. Has the unusual ability to exist in either an amorphous or highly crystalline state.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-51506376982559692632009-03-18T06:10:00.000-07:002009-03-18T06:10:01.143-07:00

Pearlescent Pigments - A class of pigments consisting of particles that are essentially transparent crystals of a high refractive index. The optical effect is one on partial reflection from the two sides of each flake. When reflections from parallel plates reinforce each other, the result is a silvery luster, iridescent effects and metallic sheen resembling natural pearl.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-90083450206894417262009-03-17T06:09:00.000-07:002009-03-17T06:09:00.980-07:00

Parting line - Line, visible on the molded part, where the mold separates to release the molded part from the cavity.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-22611762753975201972009-03-17T06:08:00.000-07:002009-03-17T06:08:00.602-07:00

Parison ejection rate - The rate of plastic flow through the die body in cubic inches per second, or pounds per second.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-21372035724879788152009-03-17T06:07:00.000-07:002009-03-17T06:07:00.779-07:00

Parison - The plastic tube formed by ejecting plastic through the die head or by injecting over a core within and injection cavity sometimes called preform.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-19543242801664438292009-03-16T06:07:00.000-07:002009-03-16T06:07:00.661-07:00

Orientation - The alignment of crystalline structure in polymeric materials so as to produce a highly aligned molecular structure.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-84676466293629020772009-03-16T06:06:00.000-07:002009-03-16T06:06:00.296-07:00

Olefins - A group of unsaturated hydrocarbons and named after the corresponding paraffins by the addition of ene or ylene to the stem. Examples are polyethylene, polypropylene, etc.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-41628679204094370132009-03-16T06:05:00.000-07:002009-03-16T06:05:00.146-07:00

Needle Blow - A system of blowing whereby the blowing medium is introduced into a mold through a needle inserted into the parison and which is frequently a part of the mold construction.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-10835301789813368202009-03-15T06:03:00.000-07:002009-03-15T06:03:00.798-07:00

Multi-cavity mold - A mold with two or more cavities.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-74975396369144635502009-03-15T05:52:00.001-07:002009-03-15T05:52:01.015-07:00

Moving Mandrel Die Head - A die head whose mandrel of die pin can be moved vertically so as to vary the orifice opening.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-49331504011358567722009-03-15T05:52:00.000-07:002009-03-15T05:52:00.712-07:00

Plastic mold frame - Series of metal plates which support mold components.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-5573279989410877682009-03-14T05:51:00.000-07:002009-03-14T05:51:00.627-07:00

Plastic mold components - Parts that make up a mold and determine how a mold will be operated.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-85805256674964927252009-03-14T05:41:00.001-07:002009-03-14T05:41:00.714-07:00

Mold - The cavity or matrix of cavities into which plastic melt is placed and takes form.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-59791522808845802062009-03-14T05:41:00.000-07:002009-03-14T05:41:00.447-07:00

Metering section of screw - A relatively shallow portion of the screw at the discharge end with a constant depth and lead, usually three to four turns of the flight in length, at which the melt is advanced at a uniform rate to the screw tip.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-45450918352427004342009-03-13T05:40:00.000-07:002009-03-13T05:40:00.077-07:00

Metallizing - Applying a thin coating of metal to a non-metallic surface.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-72783869290521500812009-03-13T05:39:00.001-07:002009-03-13T05:39:00.511-07:00

Melt Flow Index - The amount, in grams, of a thermoplastic resin which can be forced through a 0.0825 inch orifice when subject to 2,160 grams force for ten minutes at 230°C, per ATSM D1238

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-31456023328621311602009-03-13T05:38:00.000-07:002009-03-13T05:38:00.105-07:00

Mean - See Average

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-91630916544005502132009-03-12T05:37:00.000-07:002009-03-12T05:37:00.263-07:00

Matte finish - A surface which displays no gloss when observed at any angle.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-74886619315605708262009-03-12T05:36:00.001-07:002009-03-12T05:36:00.261-07:00

Melt decompression - Reducing pressure of melt during molding cycle, usually by reverse movement of screw.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-77325740692373228202009-03-12T05:36:00.000-07:002009-03-12T05:36:00.509-07:00

Melt accumulator - A cylinder equipped with a ram in which the plastic is stored between shots. Its capacity is variously given in cubic inches, or in maximum shot weight. The ram is actuated by hydraulic pressure, either variable or constant to allow for programming weight and thickness of the parison through the die opening.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-12750838287123615732009-03-11T04:25:00.000-07:002009-03-11T04:25:00.697-07:00

Melt - The material in a molten or plasticated condition.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-45892039969133353192009-03-11T04:23:00.000-07:002009-03-11T04:23:01.006-07:00

Mechanical or Electronic Programming - A method of changing the shape and wall thickness during formation of the parison.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-88757582838375781442009-03-11T04:21:00.000-07:002009-03-11T04:21:01.017-07:00

Manual cycle - A manual cycle requires that each machine function be controlled manually by an operator.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-85231628742781135342009-03-10T04:21:00.000-07:002009-03-10T04:21:00.696-07:00

Manifold - A structure containing flow passages that carry the plastic to the accumulator head or die heads.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-13100738776104792572009-03-10T04:20:00.000-07:002009-03-10T04:20:00.164-07:00

Lubricants - Prevent materials form sticking or improve processability.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-55351861827916138702009-03-10T04:18:00.000-07:002009-03-10T04:18:00.453-07:00

Low pressure mold close - Low pressure mold closing is a provision in the machine to lower the clamp closing force during the clamp closing cycle. The lower clamp forces minimizes the danger of mold damage caused by parts caught between the mold faces.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-25097570758482556202009-03-09T04:17:00.000-07:002009-03-09T04:17:00.632-07:00

lLDPE - Linear Low Density Polyethylene

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-53242975731356067262009-03-09T04:16:00.000-07:002009-03-09T04:16:00.765-07:00

Linear molecule - A long chain molecule of two-dimensional structure which may contain side chains or branches.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-74149396160319020322009-03-09T04:13:00.000-07:002009-03-09T04:13:00.536-07:00

Lead In - Initial clearance through an initial angle or chamfer that helps align two close mating parts.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-36415198551108442072009-03-08T04:12:00.000-07:002009-03-08T04:12:00.095-07:00

LDPE - Low Density Polyethylene

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-50089518353221079992009-03-08T04:10:00.000-07:002009-03-08T04:10:00.797-07:00

L/D ratio - Length to diameter ratio of an extruder screw.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-37329727591501159032009-03-08T04:08:00.000-07:002009-03-08T04:08:00.891-07:00

Knockout - Any part or mechanism of a mold used to eject the molded article.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-10789432693362036642009-03-07T12:29:00.000-08:002009-03-07T12:29:00.263-08:00

Intermittent parison - A parison ejected from the die head intermittently.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-69924561790270252082009-03-07T12:28:00.001-08:002009-03-07T12:28:00.130-08:00

Interference Fit - The mating of two points, lines, or surfaces, the dimensions of which cause negative clearance between them.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-85327716964340099512009-03-07T12:28:00.000-08:002009-03-07T12:28:00.420-08:00

In-Mold Decorating - The process of applying labels or decorations to plastic articles simultaneously with the molding operation.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-79529103177675703792009-03-07T12:27:00.000-08:002009-03-07T12:27:00.125-08:00

Injection Pressure - Pressure exerted on plastic to flow through a manifold and die head tooling.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-86498456056883074702009-03-07T12:25:00.000-08:002009-03-07T12:25:00.496-08:00

Injection Blow or Injection Transfer - A type of blow molding in which the parison is first injection molded and is then transferred to the blow molding mold for blowing.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-86338061653856660542009-03-06T12:23:00.000-08:002009-03-06T12:23:00.102-08:00

Hardness - The resistance of a material to compression or indentation. Among the testing methods Brinell, Rockwell, and ShoreHeat Deflection or Distortion Point - The temperature at which a standard test bar deflects 0.010 inches under a stated load of either 66 or 264 psi. Indication of maximum temperature that you can eject a part from a mold..

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-87823383721255385772009-03-05T12:21:00.000-08:002009-03-05T12:21:00.465-08:00

Guide Pins - Devices to maintain proper alignment for molds.Guide Rods - Rods which guide the platens but take no clamp force.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-50132073251896092252009-03-05T12:19:00.000-08:002009-03-05T12:19:02.033-08:00

Fluorescent - Organic dyes or pigments which may be blended into inks to provide a luminescent or fluorescent appearance typical of the "neon" colors.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-81475309407821266152009-03-05T12:18:00.000-08:002009-03-05T12:18:00.290-08:00

Flash - The thin, surplus web of material which is forced into crevices between mating surfaces during a molding operation, and which remains attached to the molded article.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-54365460362488038782009-03-04T12:17:00.000-08:002009-03-04T12:17:00.560-08:00

Filler - A substance added to the plastic to make it less costly. Some fillers also improve mechanical properties.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-55152954438775807632009-03-04T12:15:00.000-08:002009-03-04T12:15:00.178-08:00

Extruder Feed Throat - The section of the extruder supporting the feed hopper, frequently water cooled, through which plastic is introduced into the extruder by the feed opening.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-10929662609290335392009-03-04T12:14:00.000-08:002009-03-04T12:14:00.317-08:00

Extruder Length to Diameter Ratio = L/D - The distance from the forward edge of the feed opening to the forward end of the barrel bore divided by the bore diameter and expressed as a ratio wherein the diameter is reduced by 1, such as 24:1 or 30:1.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-77545037473770066812009-03-03T12:24:00.000-08:002009-03-03T12:25:05.337-08:00

Impact Strength - The ability of a material to withstand shock loading.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-66247557620055134832009-03-03T12:20:00.000-08:002009-03-03T12:21:26.831-08:00

Gel Permeation Chromatography - A device used to determine the molecular weight distribution of a polymer.GPC - An abbreviation for Gel Permeation Chromatography.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-75099878297255319532009-03-03T12:16:00.000-08:002009-03-03T12:17:30.360-08:00

Feed zone - Zone on the screw directly below hopper. Plastic is pre-heated in this zone, not melted.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-70342245024061523262009-03-03T12:13:00.000-08:002009-03-03T12:14:39.759-08:00

Exhaust time - The length of time required to relieve the blowing medium pressure in the molded part before opening the mold.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-14912442643809942302009-03-03T06:01:00.000-08:002009-03-03T06:01:00.304-08:00

EVOH - Ethylene-vinyl alcohol co-polymers. Used for barrier to gases.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-78462775070459690812009-03-03T06:00:00.001-08:002009-03-03T06:00:00.652-08:00

EVA (Ethylene-Vinyl Acetate) - Co-polymers from these two monomers retain many of the properties of ethylene, but have considerably increased flexibility, elongation, and impact resistance.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-33605532543454139202009-03-03T06:00:00.000-08:002009-03-03T06:00:00.297-08:00

Ethylene Plastics - Plastics based on polymers or co-polymers of ethylene.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-5314441381816898012009-03-03T05:59:00.000-08:002009-03-03T05:59:00.656-08:00

Environmental Stress Cracking (ESC) - The susceptibility of a plastic to crack or craze under the influence of certain chemicals, stresses, or other agents.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-71776608712459750822009-03-02T05:58:00.000-08:002009-03-02T05:58:01.484-08:00

Elongation - Lengthwise stretching of a material usually denoted as a % of original length.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-33626662557547706332009-03-02T05:57:00.000-08:002009-03-02T05:57:01.928-08:00

Elasticity - The property of a substance which enables it to return to its original shape and size after removal of a deforming force.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-80950546173516737192009-03-02T05:55:00.000-08:002009-03-02T05:55:01.140-08:00

Elastic deformation - The part of the deformation of as part under load which is recoverable when the load is removed.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-75060503490691143942009-03-02T05:54:00.000-08:002009-03-02T05:54:01.103-08:00

Ejection system - System used to eject the molded part from the mold after it cures.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-13113791192902418782009-03-02T05:52:00.000-08:002009-03-02T05:52:01.732-08:00

Ejection - That part of the molding cycle in which the finished part is removed from the mold mechanically.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-5274114516661160432009-03-01T05:51:00.000-08:002009-03-01T05:52:11.929-08:00

Dry coloring - A method commonly used for coloring plastics by tumble-blending uncolored and colored particles of the plastic material with selected dyes and pigments.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-69322580604491432972009-03-01T05:50:00.000-08:002009-03-01T05:51:30.215-08:00

Draft - The degree of taper of a side wall or the angle of clearance designed to facilitate ejection of parts from the mold.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-15623926267958106702009-03-01T05:49:00.000-08:002009-03-01T05:50:33.729-08:00

Diverter valve - A valve used to divert plastic from one passage to another.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-88965746910150549812009-03-01T05:48:00.000-08:002009-03-01T05:49:32.854-08:00

Die Adjustment - Means for moving the die relative to the die pin ( lower mandrel).

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-55601505715275400352009-02-23T13:58:00.000-08:002009-02-23T14:00:18.506-08:00

The purpose of the process stability test is to identify any gross mechanical design/construction flaws which will cause part variation over time. In addition, the process stability must be established with no short shots, flash, etc., prior to running designed experiments. The test is run at mid-range resin molding conditions for a period of time to allow thermal expansion equilibrium. In most

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-45128302837168308442009-02-23T13:56:00.000-08:002009-02-23T14:00:27.306-08:00

The purpose of the dry cycle mold is to evaluate the mold mechanical actions for any gross problems prior to injecting plastic into the mold. The machine operator at the mold builder or molder should know how to adjust the settings on the injection unit to cycle the mold without injecting plastic into the tool. If at anytime during the dry cycle procedure there is a possibility that damage is

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-66755087549740640032009-02-23T11:53:00.001-08:002009-02-23T11:53:40.074-08:00

Die ring - The outside ring forming wall that determines the final orifice O.D. and shape.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-77668950836701897152009-02-23T11:52:00.001-08:002009-02-23T11:52:59.919-08:00

Die pin (lower mandrel) - The removable extension of the upper mandrel forming the inside wall of the final orifice.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-73344840159255512842009-02-23T11:51:00.000-08:002009-02-23T11:52:15.389-08:00

Die mandrel - The cylindrical section in the die head about which the plastics flow. The upper mandrel supports the lower mandrel.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-79709801759094145882009-02-23T11:50:00.000-08:002009-02-23T11:51:20.598-08:00

Die land - A parallel section of the die ring just ahead of the opening.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-52022478183954892652009-02-23T11:49:00.000-08:002009-02-23T11:50:22.276-08:00

Die head manifold - A structure containing the flow passage(s) that carries the plastic to single or multiple die heads.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-72870402057047508152009-02-23T11:47:00.002-08:002009-02-23T11:48:57.325-08:00

Die head - The structure which holds the die.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-14738224695644513542009-02-23T11:47:00.001-08:002009-02-23T11:47:54.217-08:00

Die body - The main structure of the die head excluding the ring and pin.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-60573542698638097352009-02-23T11:46:00.000-08:002009-02-23T11:47:12.531-08:00

Die and pin shaping - Machining the pin and/or ring to produce a uniform or a non-uniform parison wall thickness or shape.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-4807215316250766382009-02-23T11:45:00.000-08:002009-02-23T11:46:26.544-08:00

Die and Pin Set - A matching ring and pin to form a parison of a given shape.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-53139638515743608002009-02-23T11:44:00.002-08:002009-02-23T11:45:45.528-08:00

Desiccant - A substance capable of absorbing water vapor from air or other gaseous material, used to maintain low humidity in a storage or test vessel.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-1350721546303385162009-02-23T11:44:00.001-08:002009-02-23T11:44:50.462-08:00

Density - Mass per unit volume of a substance, exposed in units such as grams per cubic centimeter, pounds per cubic foot or pounds per gallon.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-15386106473906761722009-02-23T11:43:00.000-08:002009-02-23T11:44:16.854-08:00

Degree of polymerization - The average number of monomer units per polymer molecule, a measure of molecular weight. In most plastics, the molecular weight must reach several thousand to attain worthwhile physical properties.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.comtag:blogger.com,1999:blog-807020670289352883.post-51758365560687307212009-02-23T11:42:00.002-08:002009-02-23T11:43:25.221-08:00

Degradation - A deleterious change in the chemical structure of a plastic.

azhttp://www.blogger.com/profile/05939474851219163689noreply@blogger.com