GLOSSARY

"E"

The bore of the neck, it is the basic diameter of the neck away from the threads

"H"

The height of the neck of the bottle. It generally is measured from the top of the neck to the bead or shoulder of the bottle. A portion of the "H" may be in the mold body. Some customers have their own definition for the "H" dimensions that may vary slightly.

AIR DEFLECTOR

Thin sheet metal pieces placed on the inboard side of the molds so that the air exhaust from one set of molds does not interfere with the parison dropping to the other set of cavities. They are placed on the right side of the left hand mold and the left side of the right hand mold.

BACKPLATE

The plate that goes on the back of the mold. It is used to make up thickness, transfer water, and provide mounting to the platen.

BACKUP PLUGS

Plugs put behind the pins and bushings to provide filler so that the pins and bushings are not pushed in from the face of the mold.

BASE CORNER RADIUS

The radius at the bottom of the bottle that transitions from the tail to the bottle sides.

BASE INSERT

Also called the tail, this forms the bottom of the bottle. It is usually crowned and has the pushup cut into it.

BEAD

This feature is in the neck insert. It is below the threads and is a ring on the bottle (or a groove on the neck insert).

BORE

The "E" diameter of the neck. It frequently extends into the mold body at the top of the mold. If it extends into the mold body it is called the match diameter.

CAPACITY

The volume that the mold cavity will hold. It is measured to the neck insert break unless otherwise stated.

CAVITY

The machined bottle shape.

COOLING BLOCK

A piece that is installed below the tails that cools any excess flash that may be squeezes out of the tail flash pocket.

CROWN

Also called the push up, it is the portion of the tail that is raised into the bottom of the bottle. It is there to give the bottle strength and to allow for processing variations that may distort the bottom of the bottle.

CUP STYLE BASE

It is the type of tail on the mold that incorporates the base corner radius into the tail creating a cup effect.

DEEPEST POINT

The longest points on the bottle. It is generally in the base corner radius near the tail and are the points on which the bottle will rest when it is standing.

DETABBER

A mechanical device that removes the tail flash from the bottle prior to the mold opening. There are various types with slides and cams but all have cylinders that provide the movement and a stripper bar that holds the excess plastic.

DOME

A cavity on the top of the mold that is used to blow the bottle. It is generally used on molds with larger diameter necks. In some cases a spin dome is used. This dome is spun with a belt while the neck is spin trimmed.

ENGRAVING

The process of milling letters, numbers, and symbols using small diameter cutters.

HANDING

A design and machining term used to interpret comparing the geometry and features of a left hand mold to a right hand mold on a double sided blow mold machine.

INTERRUPTED THREAD

Thread on the neck that is stopped and restarted, usually at the parting line. This is most often done when the neck is to be pinched.

KNIFE

A piece used on molds with domes that forms the top of the neck. It is usually steel. It thins the material to allow for easier trimming.

LEFT HAND MOLD

The mold on the left side of the shuttle or long stroke machine. The waterlines would come out of the mold on the left side.

MATCH DIAMETER

The diameter on the top of the mold body or shoulder insert that matches the bore of the neck.

MOLD BODY

The basic block of material that has the cavity or cavities machined into it.

NECK INSERT

Also called the finish insert, it is the piece that has the neck features machined into it.

OVALIZATION

The neck features are modified to be oval in shape to compensate for out of round necks on the bottles.

PANEL CORRECTION

Panel modification of flat panels to compensate for processing distortion. The modification results in flat panels on the bottle.

PARTING LINE

The joint between the pin and bushing sides of the mold.

PILLAR POST

Posts on the bottom face of the backplate used to distribute the platen forces if the mold does not cover the center of the platen. They provide a positive stop point on the mold when the pin and bushing half of the molds close together.

PINCH

The part of the mold that pinches the parison, sealing off the parison and allowing the bottle to be blown.

PINCH LAND

The flat surface on the top of the pinch, usually .015" to .020" wide. The pinch land on the pin and bushing half meet and create the actual pinch.

PINCH PLATE

A plate inserted on the face of the mold usually made of Beryllium Copper, Steel, or other hard material that has pinch detail cut into it. It is used on aluminum molds so that the whole mold does not have to me made from the harder material.

PINCH RELIEF

The flat area outside of the pinch that is relieved to accept the plastic on the outside of the pinch.

PINCH SCREWS

Screws used to hold pinch plates in place.

PLASTIC RELIEF HOLES

Holes on the side of the mold on the bushing halves that allow any plastic caught in the pins and bushings to get pushed out of the bushing through the side of the mold.

PRESS FIT

For mold purposes, .0005" to .001" diameter smaller that the item that goes into the hole unless specified on the drawing.

PROUD PINCH

Pinch that is above the parting line of the mold.

PRY SLOTS

Slots on the parting line of the mold body that are used to pry the mold open.

PUSH PAD

Also referred to a secondary pinch or pinch dam, usually a flat slightly below the main pinch land used to push plastic toward the pinch so that the pinch off seals better in the plastic.

PUSH UP

The raised, domed area on the tail, also called the crown.

RECYCLE LOGO

The triangle shaped engraving usually on the bottom of the bottle designating the type of plastic the bottle is made of.

REFERENCE

A clean, square, perpendicular cut made on the side or bottom of a piece made in a known relationship to a feature on the part.

REGISTER

Used in place of key ways or dowel pins on most molds the register aligns necks or other items to the mold body by use of step cuts on both sides of the part. The register on the neck would align with a corresponding register on the mold body, keying the neck to the body and not allowing the neck to move with relation to the mold.

RIGHT HAND MOLD

The mold on the right hand of the shuttle or long stroke machine. The waterlines would come out the mold on the right side.

ROCK CORRECTION

Small feet added to the bottom of the cavity that the bottle actually rest on. These are used so that the bottle does not rock when sitting on a flat surface. This is the deepest point of the tail so the overall height of the bottle is measured from the rock correction to the top of the neck.

SHIPPING STRAP

Also called safety straps these are the straps screwed to the sides of the molds that hold the two halves of the mold together while the mold is being moved.

SHOULDER

The transition area on the bottle from the neck to the body.

SLIP FIT

For mold purposes, .0005" to .001" diameter larger than the item that goes into the hole unless specified on the drawing.

STACK HEIGHT

The overall thickness of the mold when it is closed. This includes mold body, backplate, etc.

STAMPING POCKETS

A .010" deep pocket that contains the stamping. It is done to protect the stamping from being wiped out from future use if the area is ground or has something rubbing against it.

STRIKER

Also called the anvil, these are hardened steel pieces that go on the top of the mold that the blow pin rests against during the bottle blowing operation. Strikers come in one, two and four sided varieties are either pinched or not pinched. The land of the striker makes up part of the "H" and "S" dimension of most bottles.

STRIPPER BAR

Part of the detabber, this bar grabs and removes the flash before the mold opens. It is usually a grooved piece that strips the flash when the cylinder is activated.

T.I.R.

Abbreviation for Total Indicator Reading.

T.S.C.

Abbreviation for Theoretical Sharp Corner.

THREAD "T"

The major diameter of the thread on the neck of the bottle. "T" can be frequently ovalized to compensate for distortion during molding.

TIE BAR CLEARENCE

The area that is cut out of the mold to allow clearance for the molding machine tie bars.

TRIM TOOLING

Auxiliary equipment that trims the flash from the bottle after molding. Trim tooling usually consists of transfer tooling which moves the bottles between the trim tooling station, nests which hold the bottle, and punches which actually cut the flash.

TUNNELS

Areas along the pinch at the base of the bottle that is raised from the bottom of the bottle to allow excess tail flash in the area that will not cause the bottle to rock on the scar from the flash.

VENT PINS

Usually a brass pin that has slots that are a press fit into the cavity to allow air to escape from the cavity. These are also used in IML (In Mold Labeling) applications.

VENTS

A mold feature used to allow air to escape from the cavity, either along the parting line as a peripheral or bar vent, or in the cavity as a vent pin.

WATER CHECK

A water pressure test of the mold to make sure the mold does not leak and that the water flows through the mold properly.

WEB

The thickness of metal on the bottom of the mold body. It is usually between .125" to .250" thick. The web at the base of the mold is only on molds with post style base inserts. The web matches the post style base height.

WIPING

The hand polishing of the molds to remove tool marks on the cavity surface.

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