HOW ARE PLASTIC BOTTLE CAPS INJECTION MOLDED AND DESIGNED? NO WONDER BEAUTIES CAN'T OPEN THEM!
Author: SZTC
2024-11-20
How are plastic bottle caps made for a few cents each? Are the bottle cap and the anti-theft ring integrated or something else when opening a beverage bottle? Why can't some beauties open the cap? The doubts hidden in my heart for many years have been solved!
The bottle cap is fastened to the bottle mouth by cooperating with the bottle mouth to prevent the leakage of the bottle contents and the invasion of external bacteria. After tightening the bottle cap, the bottle mouth goes deep into the bottle cap to the top of the sealing pad, and the inner groove of the bottle mouth and the thread of the bottle cap are in close contact with each other, providing pressure for the sealing surface. Several sealing structures can effectively prevent the leakage or deterioration of the bottle contents.
There are also many strip-shaped anti-slip grooves on the outer edge of the bottle cap, which is convenient for increasing friction when opening the cap.
1
Two processes for the production of plastic bottle caps
1. Compression molding bottle cap production process
Compression molding bottle caps have no material mouth marks, look more beautiful, have low processing temperature, small shrinkage, and more precise bottle cap size.
The upper and lower molds are combined and pressed into the shape of a bottle cap in the mold
The bottle cap formed by compression molding remains in the upper mold, the lower mold is removed, the bottle cap passes through the rotating disk, and the bottle cap is removed from the mold in the counterclockwise direction of the internal thread.
2. Injection molding bottle cap production process
The injection mold is large and difficult to replace. Injection molding requires high pressure to produce multiple bottle caps per mold, and the material heating temperature is high, so the energy consumption is higher than compression molding.
Put the mixed material into the injection molding machine, heat the material to about 230 degrees Celsius in the machine to become a semi-plasticized state, and inject it into the mold cavity by pressure, and cool and shape it.
After injection molding, twist the mold upside down to let the bottle cap fall out
The bottle cap cooling and shrinking mold rotates counterclockwise, and the bottle cap is ejected under the action of the push plate, so that the bottle cap automatically falls off. The use of thread rotation demolding can ensure the complete molding of the entire thread, which can effectively avoid deformation and scratches of the bottle cap.
Printing on bottle cap
Bottle cap with printed words
2
Production of anti-theft ring (ring)
If you are careful, you will find that the bottle cap also includes the anti-theft ring (ring). That is, after the cap is made and the anti-theft ring (ring) is cut, a complete bottle cap is produced.
Anti-theft ring (ring) is a small circle under the bottle cap, also called a one-time break anti-theft ring. When the cap is unscrewed, the anti-theft ring will fall off and remain on the bottle. This can be used to determine whether a bottle of water or a bottle of beverage is complete or has been opened.
Usually we wonder, are the bottle cap and the anti-theft ring (ring) integrated or connected later during packaging? The answer is integrated + ring cutting!
The finished bottle caps are lined up in one direction and sent to the ring cutting. When they are scratched by the ring cutting knife with teeth, the anti-theft ring connected by points is made~
The steps are as follows:
The bottle caps are lined up in one direction and sent to the ring cutting road
Circling
The ring cutting knife with teeth
The anti-theft ring is separated from the bottle cap
The reason why the bottle cap can be sealed very firmly is closely related to its manufacturing process and structure. So, some people asked, why can't many beauties always unscrew the plastic bottle cap?
Some people say this is a routine. If girls can unscrew all the bottle caps, then boys will have no chance to show off. What do you think? Please check in in the comment area~~
The bottle cap is fastened to the bottle mouth by cooperating with the bottle mouth to prevent the leakage of the bottle contents and the invasion of external bacteria. After tightening the bottle cap, the bottle mouth goes deep into the bottle cap to the top of the sealing pad, and the inner groove of the bottle mouth and the thread of the bottle cap are in close contact with each other, providing pressure for the sealing surface. Several sealing structures can effectively prevent the leakage or deterioration of the bottle contents.
There are also many strip-shaped anti-slip grooves on the outer edge of the bottle cap, which is convenient for increasing friction when opening the cap.
1
Two processes for the production of plastic bottle caps
1. Compression molding bottle cap production process
Compression molding bottle caps have no material mouth marks, look more beautiful, have low processing temperature, small shrinkage, and more precise bottle cap size.
The upper and lower molds are combined and pressed into the shape of a bottle cap in the mold
The bottle cap formed by compression molding remains in the upper mold, the lower mold is removed, the bottle cap passes through the rotating disk, and the bottle cap is removed from the mold in the counterclockwise direction of the internal thread.
2. Injection molding bottle cap production process
The injection mold is large and difficult to replace. Injection molding requires high pressure to produce multiple bottle caps per mold, and the material heating temperature is high, so the energy consumption is higher than compression molding.
Put the mixed material into the injection molding machine, heat the material to about 230 degrees Celsius in the machine to become a semi-plasticized state, and inject it into the mold cavity by pressure, and cool and shape it.
After injection molding, twist the mold upside down to let the bottle cap fall out
The bottle cap cooling and shrinking mold rotates counterclockwise, and the bottle cap is ejected under the action of the push plate, so that the bottle cap automatically falls off. The use of thread rotation demolding can ensure the complete molding of the entire thread, which can effectively avoid deformation and scratches of the bottle cap.
Printing on bottle cap
Bottle cap with printed words
2
Production of anti-theft ring (ring)
If you are careful, you will find that the bottle cap also includes the anti-theft ring (ring). That is, after the cap is made and the anti-theft ring (ring) is cut, a complete bottle cap is produced.
Anti-theft ring (ring) is a small circle under the bottle cap, also called a one-time break anti-theft ring. When the cap is unscrewed, the anti-theft ring will fall off and remain on the bottle. This can be used to determine whether a bottle of water or a bottle of beverage is complete or has been opened.
Usually we wonder, are the bottle cap and the anti-theft ring (ring) integrated or connected later during packaging? The answer is integrated + ring cutting!
The finished bottle caps are lined up in one direction and sent to the ring cutting. When they are scratched by the ring cutting knife with teeth, the anti-theft ring connected by points is made~
The steps are as follows:
The bottle caps are lined up in one direction and sent to the ring cutting road
Circling
The ring cutting knife with teeth
The anti-theft ring is separated from the bottle cap
The reason why the bottle cap can be sealed very firmly is closely related to its manufacturing process and structure. So, some people asked, why can't many beauties always unscrew the plastic bottle cap?
Some people say this is a routine. If girls can unscrew all the bottle caps, then boys will have no chance to show off. What do you think? Please check in in the comment area~~
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