Analysis of common phenomena of plastic preforms

(1) When designing squeeze plastic bottles, if the material is polyethylene or polypropylene, the cross-section of the plastic bottle should be rectangular or oval. For low-density polyethylene or other flexible plastic bottles, the cross-section should be Preferably round.

This facilitates the extrusion of the contents from the plastic bottle. The plastic parts used in conjunction with plastic bottle mouths are mainly bottle caps and sealers. The planning of the plastic bottle mouth should focus on; consider how to make the plastic bottle mouth better cooperate with the cap and sealer. The bottom of the plastic bottle is the weak part of the mechanical function of the plastic bottle.

Therefore, the bottom of the plastic bottle is generally designed as a concave shape; the corners of the plastic bottle and the concave part are all made with larger arcs. In order to facilitate the accumulation of plastic bottles and increase the stacking stability of plastic bottles, inner grooves should be planned at the bottom of plastic bottles.

(2) When using labels on the surface of plastic bottles, the surface of the labels should be flat. A "frame" can be designed on the surface of the plastic bottle so that the label can be positioned accurately without movement. During blow molding, the part that the parison inflates first contacts always tends to harden first. Therefore, the wall thickness of this part is also larger. The edge and the corner are the parts where the parison blows and contacts, and the wall thickness of this part is relatively small.

Therefore, the edges and corners of plastic bottles should be designed as rounded corners. Changing the outer shape of the plastic bottle, such as making the middle part of the plastic bottle relatively thinner, adding circumferential grooves or ribs on the outer surface of the plastic bottle can improve the rigidity and bending resistance of the plastic bottle. Longitudinal grooves or ribs can eliminate the deflection, sagging or deformation of plastic bottles under long-term load. Bottle cap series prices.

(3) The printing surface of plastic bottles is the part where consumers focus their attention. The printed surface should be flat and continuous; if the plastic bottle contains structures such as handles, grooves, and ribs, care should be taken during design not to cause inconvenience to the printing operation. The oval plastic bottle has higher rigidity, but the manufacturing cost of the mold is higher. Therefore, in order to ensure the rigidity of plastic bottles, in addition to selecting materials with high rigidity, it is also necessary to enhance the rigidity and load-bearing strength of plastic bottles through the shape design of plastic bottles.

(4) Since most plastics are notch sensitive, plastic bottles are prone to cracks and cracks at the sharp corners, the root of the mouth thread, and the neck, so these parts should be planned as rounded corners. For the transfer point of the rectangular plastic bottle, it is necessary to support most of the load of the plastic bottle, so partially increasing the wall thickness at this point is also conducive to improving the rigidity and load-bearing strength of the plastic bottle.

38MM 2start Preform

NECK TYPE		WEIGHT	HEIGHT	QTY/CTN	CARTON SIZE
38mm 2start PET preform		18g		1080	50x38x28
38mm 2start PET preform		20g		1080	50x38x28
38mm 2start PET preform		26g		648	50x38x28
38mm 2start PET preform		28g		648	50x38x28
38mm 2start PET preform		30g	101mm	588	47x31x34
38mm 2start PET preform		32g	101mm	588	47x31x34
38mm 2start PET preform		52g	140mm	285	53x33x33
38mm 2start PET preform		59g	152mm	240	47x31x34
38mm 2start PET preform		64g	152mm	240	47x31x34
38mm 2start PET preform		70g	150mm	150	53x33x33
38mm 2start PET preform		75g	150mm	150	53x33x33