【 Analysis of common phenomena of 38mm pp caps 】

(1) When planning extruded plastic bottles, if the raw material is polyethylene or polypropylene, the cross section of the plastic bottle should be rectangular or oval, and the raw material is polyethylene or other flexible plastic bottles, the cross section is better to be circular.

This makes it easy to squeeze the contents out of the plastic bottle. The plastic parts used in cooperation with plastic bottle mouths are mainly bottle caps and sealers. Consider how to make the plastic bottle mouth can better cooperate with the cap and seal 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 planned into a concave shape; The corner of the plastic bottle and the inner recess are made of large arc. In order to facilitate the accumulation of plastic bottles, add the stacking stability of plastic bottles, and the bottom of the plastic bottles should be planned with grooves.

(2) When labeling the appearance of plastic bottles, the labeling surface should be flat. A "frame" can be planned on the surface of the plastic bottle so that the label is accurately positioned and does not move. In blow molding, the first part of the billet blowing contact, always tend to the first hardening part. Therefore, the wall thickness in this area is also larger. The edge and the corner part are the parts of the billet blowing contact, and the wall thickness of this part is small.

Therefore, the edges and corners of plastic bottles should be planned into rounded corners. Change the appearance of the plastic bottle shape, such as the middle of the plastic bottle is relatively thin, add the circumferential groove or convex rib on the appearance of the plastic bottle, can improve the rigidity and bending resistance of the plastic bottle. The longitudinal groove or reinforcement can eliminate the deviation, sagging or deformation of the plastic bottle under long-term load. Bottle cap series price. (Bottle wholesale)

(3) The printing surface of plastic bottles is the place where consumers' attention is concentrated. The printing appearance should be flat and continuous; If the plastic bottle contains a handle, groove, reinforcement and other structures, the planning should be careful not to cause inconvenience to the printing operation. Oval plastic bottle, the rigidity is also higher, 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 stiffness, the rigidity and load resistance of plastic bottles are enhanced through the shape planning of plastic bottles.

(4) Because most plastics have notch sensitivity, plastic bottles are prone to cracks and cracking at sharp corners, the root of the mouth thread, the neck and other parts, so these parts should be planned into rounded corners. Regarding the transfer of rectangular plastic bottles, most of the load of plastic bottles needs to be supported, so the local addition of the wall thickness of the plastic bottles is also conducive to improving the stiffness and load resistance of plastic bottles.

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