PBMS manufacture specialised Ranges: Custom designed and owned moulds and containers.
PBMS can assist in manufacturing moulds and products which are customer specific.
Tablet & Capsule Containers
Various shaped containers and neck sizes for packing of varying quantities of tablets and capsules
What is an Injection Mould and a Blow Mould?
The process of injection molding (IM) is used for the production of hollow glass and plastic objects in large quantities. In the IBM process, the polymer is injection molded onto a core pin, then the core pin is rotated to a blow molding station to be inflated and cooled. This is typically used to make small medical and single serve bottles. The process is divided into three steps: injection, blowing and ejection.
The molten polymer is fed into a manifold where it is injected through nozzles into a hollow, heated preform mold. The preform mold forms the external shape and is clamped around a mandrel (the core rod) which forms the internal shape of the preform. The preform consists of a fully formed bottle/jar neck with a thick tube of polymer attached, which will form the body.
The preform mold opens and the core rod is rotated and clamped into the hollow, chilled blow mold. The core rod opens and allows compressed air into the preform, which inflates it to the finished article shape.
After a cooling period the blow mold opens and the core rod is rotated to the ejection position. The finished article is stripped off the core rod and leak-tested prior to packing.
In the blow molding (BM) process, the plastic is first molded into a “preform”. These preforms are produced with the necks of the bottles, including threads (the “finish”) on one end. These preforms are packaged, and fed later (after cooling) into an EBM blow molding machine.
In the BM process, the preforms are heated (typically using infrared heaters) above their glass transition temperature, then blown using high pressure air into bottles using metal blow molds. Usually the preform is stretched with a core rod as part of the process. The main applications are bottles, jars and other containers.
Resin Identification Codes
Properties: toughness, strength, heat resistance, barrier to moisture and gas.
Description: PET, also referred to as polyester, is a popular packaging material for food and non-food products because it is inexpensive, lightweight, resealable, shatter-resistant and recyclable. PET is clear and has good moisture and gas barrier properties.
Packaging applications: Soft drink bottles, water bottles, mouthwash bottles, peanut butter containers, salad dressing containers, juice bottles, vegetable oil bottles
NOTE: The acronym PETE was adopted by manufacturers to identify packaging made from PET primarily in response to a potential trademark dispute.
High Density Polyethylene
Properties: toughness, strength, stiffness, ease of forming, ease of processing, resistance to moisture and chemicals, permeability to gas.
Description: Bottles made from HDPE come in both pigmented and unpigmented resins. The unpigmented resin is translucent. It also has good stiffness and barrier properties. HDPE’s good chemical resistance allows it to be used in containers holding household or industrial chemicals. The pigmented resin has even better crack resistance and chemical resistance than the unpigmented resin.
Packaging applications: Milk containers, juice bottles, water bottles, bleach, detergent, and shampoo bottles, motor oil bottles, household cleaner bottles.
Properties: toughness, strength, ease of blending, ease of processing, resistance to grease, oil, and chemicals, clarity.
Description: Vinyl, or polyvinyl chloride, has stable physical properties. It has excellent chemical resistance and good weatherability. It’s stability makes it very suitable for household chemicals and its clarity for food and toiletry products.
Packaging applications: Window cleaner bottles, cooking oil bottles, detergent bottles, shampoo bottles, clear food packaging, wire and cable jacketing, medical tubing, with additional significant usage in household products and building materials, particularly siding, piping, and windows
Low Density Polyethylene
Properties:: toughness, strength, flexibility, ease of sealing, ease of processing, barrier to moisture.
Description: Because of its toughness, flexibility, and transparency, LOPE is commonly used in applications where heat sealing is necessary. It is also widely used in injection moulding of snap on closures.
Packaging applications: Squeezable bottles, snap on closures, squeeze tubes.
Properties: toughness, strength, resistance to heat, grease, oil, and chemicals,
barrie r to moisture.
Description: Polypropylene has the lowest density of the resins used in packaging. It is strong and is resistant to chemicals. Since it has a high melting•point it can be utilized in applications requiring that a container be filled with a hot liquid. Clarified PP is ideal for household chemicals that require good clarity and chemical resistance.
Packaging applications: Yogurt containers, syrup bottles, ketchup bottles, caps, and medicine bottles.
Properties: ease of forming, clarity, low heat transfer, good thermal insulation.
Description: Polystyrene can be made into rigid or foamed products. It has a
relatively low melting point.
Packaging applications: Meat trays, egg cartons, take-out containers, compact disc jackets.
Properties: varies according to constituent resins.
Description: The category of “Other” includes any resin not specifically numbered 1, 2, 3, 4, 5, or 6, or combinations of one or more of these resins such as in multi- layer bottles.