Find blow molding including plastic bottles, injection blow molding, blow mold and more. From blow molded cases and blow molded plastics to stretch blow molding, you will find the blow molding you need. Use the time-saving Request for Quote tool to submit your inquiry to all the blow molding companies and services you select.
Western Industries Plastic Products Group provides custom plastic blow molding product design, engineering, mold design and extensive capabilities and manufacturing expertise for mid- to large-part products, in both single- and dual-head processing. Contact us for all of your blow molded plastic needs.
R & D Molders has provided custom blow molding and injection molding to a variety of industries since 1974. We offer complete in-house tooling, mold making and secondary operations such as assembly, machining, hot stamping and sonic welding. Let us be a one stop turn-key source for your molding requirements.
Agri-Industrial Plastics is a provider of custom, large-part blow molded plastics. Our expertise is in the design and production of structural panels, specialty products and complex gas tanks with up to a 20 gallon capacity. With our state-of-the-art machines, we are committed to creating the highest quality products.
Our plastic bottles are innovative and high quality for packaging your product. Choose from our 4 types of blow molding: extrusion, injection, stretch, & reheat. Beverage bottles, chemical bottles, liquor bottles, water bottles and much more are here. We work with you from prototype to market!
Over 60 years experience in blow molding and injection molding. Specialists in the design and production of medical devices, vials, bottles, packaging and industrial items. Consultant services include "Inventor's Help Guide" through all stages from basic concepts to mass production.
See NOVAPAK PET, PVC and HDPE containers for personal care, household, food, automotive and industrial products; AIROPAK® HDPE in-line fluorinated containers for aggressive chemicals; and MARPAC® technical-blow-molded containers and parts. We provide superior value to our customers.
We are custom blow molders, offering engineering, product design assistance, mold construction, material selection and other custom blow molding services. We design and manufacture blow molded plastics with capacities ranging from 8 to 40 lbs. We are ISO 9001:2000 registered and ready to serve you!
MWP has been a custom blow molder since 1986. We began by serving the plastic bottle industry and now serve many industries with our blow molding capabilities. We do blow molding up to 8 lbs. Great material and color selection, secondary operations and packaging, warehousing & distribution services.
For over 40 years, Cado has been a full service provider for the plastics industry. We are a custom designer and manufacturer of molds, as well as blow and injection molded parts. We provide solutions for short term runs as well as high volume production in either commodity or engineering grade resins.
Blow molded plastic is any hollow plastic product,
the most common being bottles, that results from the blow molding
process. Blow molding uses a continuously running extruder to which a
tuned die head is attached, forming a parison. The hot, hollow thermoplastic
tube, which is either extruded or reheated, is set within the cavity
of a mold and held in place with clamps. Using a blow pin, air pressure
is introduced through the inside of the parison, forcing it to assume
the shape of the mold. The end product is cooled by conduction or the
evaporation of volatile fluids in the container. The purpose of blow molding services is to form a uniform finished product that does not need to be
joined together in any way.
Blow molding services use three basic methods for producing blow
molded plastic: extrusion,
injection and stretch blow molding. Extrusion blow molding is the simplest
type that allows for a wide variety of container shapes, sizes and neck
openings, along with handleware of many kinds. The parison is dropped
from an extruder and captured in a water-cooled mold where it is blown
against the mold and frozen into shape. Shuttle and reciprocating extrusion
machines are used for small to high volume production, while wheel extrusion
machines are the most efficient for huge volume production of certain
resins. Injection blow molding is a hybrid of the injection molding and
blow molding services and is suitable for smaller containers but not
for handleware of any kind. In this process, hot plastic material is
injected into a cavity. A neck is created as the material encircles the
blow stem, which also establishes the gram weight. The injected material
is moved to the next station on the machine where it is subjected to
the extrusion blow molding process.
Two types of stretch blow molding are injection stretch blow molding
(ISBM) and reheat and blow (RHB) molding, both of which are typically
used to manufacture P.E.T bottles for juice, water, etc. In the ISBM
process, a preform is injection molded and then transferred to another
station on the machine, where it is blown. It is then ejected. Because
ISBM is so costly, it generally requires extremely high volume (in the
multi-millions) runs and is used for items such as wide-mouth peanut
butter jars, narrow mouth water bottles, liquor bottles and more. In
RHB, a preform is purchased from a vendor that has already put it through
an injection molding process. It is then reheated in a relatively simple
machine in order to prepare it for blowing. RHB is advantageous because
the purchaser does not have to invest in expensive injection molding
machinery but still has access to a large catalog of existing preforms.
Distinct advantages exist for choosing the blow molding process over other
plastic manufacturing processes. It is the most well-suited
method for forming hollow plastic parts. It has much lower mold costs than injection
molding. Blow molding has a faster cycle time than that of rotational
molding. In many cases, one blow molded plastic piece can take the place
of many individual parts. However, the scattering
of mold thickness is present, due to swell and drawdown. Swell refers to the rapid
increase of the thickness of the parison as the polymer melts leave the
die and are released into the air. In drawdown, the parison is stretched
by its weight, reducing its thickness.
Extrusion blow molding is
the process in which a hot parison or preform is placed into a two-part
mold. In the mold,
the parison or preform is inflated with compressed air, which presses
it against the walls, and then is cooled and removed by separating
the mold halves.
Injection blow molding blends
the two methods of blow molding and injection molding and is typically
used in the manufacturing of soda
bottles.
A preform, which is similar to the parison, is either injection
plastic molded
and then transferred to a blow molding machine, or the injection and
blow molders are combined.
Injection stretch blow
molding (ISBM) is a two-stage, stretch blow
molding process in which a preform is injection molded and then
transferred to another station where it is blown and ejected from the
machine.
Reheat and blow (RHB) is
a stretch blow molding process in which a preform is injection molded
by a vendor and then purchased
and reheated
by another company.
Common Terms Related to Blow Molding
Clarity – The lack of haze or cloudiness in a
plastic material.
Elastomer – A material that at room temperature has the ability
to return to its original shape after being stretched up to twice its
length.
Finish – Also known as the “E” dimension, it is the
material enclosing the neck opening of containers that accommodate particular
closures.
Flash – Extra plastic attached to a molding along the parting line.
Flash must be removed (i.e. deflashed) before the part can be considered
finished.
Flame Treating – A technique of making inert thermoplastic items
responsive to adhesives, inks and paints. The submersion of the item
in an open flame induces surface oxidation.
Fluorination – A procedure
that diminishes permeability and increases the chemical resistance of
different plastics and elastomers. The exposure
of polymers to fluorine gas causes molecular structural surface changes.
Minimum Wall – The thinnest part of the wall of a bottle.
Mold Cavity – The hollow part of a group of molds that forms a
container on bottle machines.
Mold Seam – A vertical line formed at the point where the mold
halves meet, the prominence of which depends on the accuracy with which
the halves are matched.
Multi-layer Bottles – Bottles comprised of layers of special plastic
materials that are co-extruded to preserve and use the unique characteristics
of each material to improve the barrier qualities of the container and
increase the product shelf life.
Natural Color – Refers to the natural translucent appearance of
the plastic material of containers and closures.
Neck Ring – The component of the molding apparatus that produces
the bottle finish.
Paneling – The collapse of a portion of a container structure,
due to a loss of interior pressure, which occurs during aging and storage.
Parison – The empty cylinder of plastic melt that emerges from
the extruder die head and expands in the mold space from air pressure,
producing the molded part.
Parting Line – The mark on a plastic bottle where the two halves
of the mold meet at the point of closure.
Preform – A heat-softened polymer shaped like a thick test tube
with neck threads that is inflated while inside a blow mold.
Programming – A procedure for mechanically altering the weight,
size or wall thickness of the parison as it forms.
Shrinkage – A decrease in dimension of an article after the molding
process, which is caused by the contraction of the plastic material upon
cooling.
Side Seam – The seam that joins both edges of a blank forming a
body.
Surface Treating – Any treatment technique, including chemical,
electronic and flame treatments, that makes plastic receptive to inks,
lacquers and adhesives.
