BS ISO 11093-4:2016 pdf download.Paper and board — Testing of cores — Part 4: Measurement of dimensions
1 Scope
This part of ISO 11093 specifies test methods for the determination of the internal diameter, the external diameter, the wall thickness and the length, of paper and board cores.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 13385-1, Geometrical product specifications (GPS) — Dimensional measuring equipment — Part 1:Callipers; Design and metrological characteristics
ISO 3611, Geometrical product specifications (GPS) — Dimensional measuring equipment: Micrometers for external measurements — Design and metrological characteristics
ISO 11093-1, Paper and board — Testing of cores — Part 1: Sampling
ISO 11093-2, Paper and board — Testing of cores — Part 2: Conditioning of test samples
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 internal diameter
d
dimension of the internal width of the cylindrical core
Note 1 to entry: See Figure 1.
3.2 external diameter
D
dimension of the external width of the cylindrical core
Note 1 to entry: See Figure 1.
3.3 wall thickness
s
distance between the inner and outer surfaces of the core
Note 1 to entry: See Figure 1.
6.2 Method A
6.2.1 Apparatus
An internal tri-point micrometer equipped with a ratchet and accurate to at least 0,025 mm. The instrument shall also be fitted with a slip arrangement such that the measuring force cannot exceed the following:
— internal diameter up to 100 mm: (4,5 ± 0,2) N;
— internal diameter over 100 mm: (9,0 ± 0,3) N.
6.2.2 Procedure
Before using, the device should be calibrated with the help of a calibration ring. To get accurate results,use, if possible, a measurement plate or a centring ring. Avoiding any obvious deformation, insert the tri-point micrometer at least 10 mm from one end of the test piece in a way that device is accurately in core direction. Take two measurements, to the nearest 0,025 mm, approximately 60° apart. Repeat the procedure at the other end of the test piece. Average the four readings and report to the nearest 0,025 mm.
6.3 Method B
6.3.1 Apparatus
A vernier calliper accurate to at least 0,1 mm (see ISO 13385-1).
6.3.2 Procedure
Avoiding any obvious deformations, insert the calliper into the test piece such that the measuring faces are aligned axially and radially. Take two measurements, to the nearest 0,1 mm, 90° apart. Repeat the procedure at the other end of the test piece. Average the four readings and report to the nearest 0,1 mm.
BS ISO 11093-4:2016 pdf download
