If a standard bottle is not exactly what you are looking for we can offer custom moulding design bottles on orders from 150,000 units per year. All the custom designs are made by 3D software programs like Solidworks which allows us to create custom designs at low cost. 3D prototypes can also be easily made in house as Frapak uses rapid prototyping.
The raw material of HDPE bottles is HDPE which is an acronym of High Density Poly Ethylene. This raw material is a thermoplastic and has the recycling code 2. As HDPE bottles or PEHD bottles has a high tensile strength it is very suitable for the blow moulding of cosmetic bottles.
LDPE or PELD has a lower density and therefore less tensile strength making it softer. In some cases both PE materials are mixed together so that the bottles are strong enough but can still be squeezed.
The advantages of blow moulding is that the process is very flexible in regard to the raw materials which can be used and allows more freedom in design. Extreme designs can be achieved such as off centre neck placements and openings, even a punched hole is possible
The other advantage is that the weight and the wall thickness can be controlled using the PLC of the blow moulding machine which enables the same bottle to be produced in different weights.
Although mono layer bottles are adequate in most cases, sometimes it is necessary to have more than one layer in your bottle; this is called multi-layer. By adding co-extruders to the blow moulding machine it is possible to create multi-layer bottles. These extra layers provide a better chemical resistance, a barrier against UV or a soft touch finish commonly found in the cosmetic market.
The design of the shoulder of the HDPE bottle can have an impact on the top load resistance, this means that the mechanical strength of the bottle is partly determined by its design. In cases where a high top load is expected because of the application of a snap closure or because of the stackable weight in the logistic chain, then some precautions should be taken.
The body of the PE bottle normally accommodates the label, although this does depend on its design. It is, therefore, technically important for this surface to be as flat as possible and have one single curvature so that the label can be easily applied. With round HDPE bottles the parting line of the blow mould is covered by the label or by a screen print. This parting line should therefore be as smooth as possible. To enable the efficient filling of the HDPE bottles the design of the body has to be such that the bottle remains stable on the conveyor and does not nest.
The bottom of the bottle ensures this stability and usually accommodates the HDPE recycling logo, the cavity number and the article number. In most cases the producer adds his logo so that the origin of production can be identified. The bottom of a bottle also usually has an orientation point with a specific shape which allows the HDPE bottle to be screen printed. This point makes the positioning of the screen print easier and can therefore be positioned is such a way that the front of the design is aligned with opening of the closure on the bottle.