Hi all
I am currently working on the design of a 500ml plastic (PET) bottle and I have a few questions.
1- How to draw the hollow surface on the body of the bottle dedicated to the location of the label? (creation of an offset surface and then removal of material until it knowing that I have to put it on both sides of the bottle). If not, is there another idea?
2- To draw the thread of the cap, it is better to grab it from the Solidworks library or draw it yourself?
Thank you very much.
Ibrahim
Hello
1 - see Winding - 2022 - SOLIDWORKS Help
2 - The advantage of the nets provided by SW is that they are standard nets for bottle necks. (SP4xxx bottle).
Hello
On this kind of thing, the easiest thing with SW is often to:
The final geometry is very close to reality if the blown/rotomolded thickness is constant.
From memory there were SW tutorials existing on this kind of bottle (NB: English is good if you want to find it on the internet). Maybe even in SW's help files.
Hello @froussel
Of course, the thickness is not constant for the blown parts since the preform comes from a cylindrical die by extrusion.
If you want to respect the non-constant thickness as in real life, maybe it is better to go with surface and thicken.
You will have to make mini exterior and interior rays so that the raised part is realistic. Be careful because the embossing does not always respect the right thickness.
Kind regards
Hello
Taking into account the remarks of our colleagues, particularly @froussel I propose the ZOZO method in bourin (bouricot) mode. Knowing that PET bottles are made from an injected plastic preform. It's not like it used to be.
A video will be simpler.
Kind regards
Kiss Method (Keep it simple and stupid)
About parison, in reality for PET they are preforms, look at the animation on Wikipedia where you can see very well the two distinct transformations
And here the type of mold to make the preforms mounted on the injection molding machine.
Question Kouize
Why PET bottles are made on two machines with very different functionalities.
I was thinking more about this process:
But it's more for containers larger than 3L.
You get an almost uniform thickness except on the joint lines or places with a slightly more complex geometry (handle)
And another deliciously vintage 80's:
That was 40 years ago, for example, for the Evian bottles. But even that was a little more complicated than for blowing a can with the technique we see on your video
For the qouize I was asking the question why for bottles do we prefer to do the neck in two steps 1°) the preform on an injection press then the blowing on another machine 
Hello
There is also extrusion by revolution which can simplify the mode.
The preform to have a precise thread (blowing will not allow you to have a thread such as the one present on water bottles).
Then we blow to press the plastic against the mold.
I think he's talking about the function under SW.
And to answer the question about the geometry of the label, it all depends on the way the bottle is made.
If it's blowing, the shape will come to rest on the mold but there will necessarily be a deformation on the internal side (see the geometry of a water bottle)
Yes, I was talking about the function. Valid for a cylindrical bottle only, of course.
@ ALL
I still find it strange that we are solicited on this forum and that several days later there is no new post from the first-time applicant.
Vox clamantis in deserto 
I agree