Plastic Bottle Corporation Manual   
Plastic Bottle Corporation 888.722.7465
 
Product Information from Plastic Bottle Corporation
New Items from Plastic Bottle Corporation
Featured Items
Come See Us from Plastic Bottle Corporation
Talk to Plastic Bottle Corporation
Newsletter from Plastic Bottle Corporation
History from Plastic Bottle Corporation
Technical Information from Plastic Bottle Corporation
Technical Information from Plastic Bottle Corporation
Favorite Links from Plastic Bottle Corporation
Careers at Plastic Bottle Corporation
Home page of Plastic Bottle Corporation
Visit us on Facebook

Torque Guidelines for Capping Bottles

Definition: Torque is rotational force applied during application or removal of a closure from a bottle.

A. Application Torque:

The rotational force with which a closure is applied to a bottle finish during capping. It affects seal integrity and tightness between bottle and closure. Properly established application torque will provide sealing integrity under expected conditions or temperatures, humidity and shock.
 
B. Removal Torque:
The rotational force with which a threaded closure is removed or unscrewed from a bottle finish. It defines the amount of rotational force necessary to loosen, open, or remove the closure. A properly designed package should have a removal torque range appropriate for its intended use and the consideration of any requirements for child resistant or tamper evident closure needs.
 
C. Stripping Torque:
The application torque which is sufficient to cause the closure and/or bottle finish to distort and override the matching closure/bottle threads, resulting in loose caps, no seal, or package component deformation.
 
D. Torque Values:
Torque is defined in inch-pounds or Newton-meters and is measured by various types of torque meters. Specific methods for performing torque tests are defined in Technical Bulletin PBI No. 7. The optimum relationship between applied and removal torques and good sealing characteristics under various physical and environmental conditions must be established for each individual package. Application torque requirements also vary according to the closure size being used.
 

The following torque values are listed for use as guidelines only, and are to be used for closure application by hand under controlled conditions. Special conditions may require torque values other than those listed.

    Neck Finish    
    Identity    
App. Torque
    (inch-pounds)    
8
10
13
15
18
20
22
24
28
30
33
38
43
48
53
58
63
66
70
83
86
89
100
110
3-7
4-8
5-9
5-9
7-10
8-12
9-14
10-18
12-21
13-23
15-25
17-26
17-27
19-30
21-36
23-40
25-43
26-45
28-50
32-60
40-65
40-70
45-70
45-70

Note: Immediate removal torque values are approximately 40-80% of application torque values. Production capping equipment should be adjusted to produce similar immediate removal torque values.

*These are generally accepted application torques. Specific closures may require specific application torques which differ from those listed above. Check with your closure manufacturer for specific information.

 

Technical Article: The Necessity of Obtaining Closure Samples and Information Prior to a Plastic Bottle Production Run

Child Resistant Closure Specifications

Material Codes/Recycling Symbols

Freight Classifications

Properties of Resins

SPI Neck Finish Specifications

Technical Article: The Blow Molding
Process
Closures & Containers Magazine

Technical Article: The Market Share
Closures & Containers Magazine

Third Party Packaging Certification Agencies

Torque Guidelines for Closures