ASTM D957-12
(Practice)Standard Practice for Determining Surface Temperature of Molds for Plastics
Standard Practice for Determining Surface Temperature of Molds for Plastics
SIGNIFICANCE AND USE
3.1 The properties of molded parts and the ease of producing satisfactory specimens are influenced by the temperature of the mold. It is desirable to know the actual mold temperature, which can differ from the mold temperature control medium.
3.2 The user needs to be aware of temperature differences across the mold/thermocouple interface and at leads, and take appropriate precautions to minimize such differences.
SCOPE
1.1 This practice is intended for determining the temperature at a specified point or points on the surface of the cavity and base of a mold for plastics. By determining the temperature at as many points as deemed necessary, the overall temperature condition of the surface can be determined.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.Note 1—There is no known ISO equivalent to this standard.
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Designation: D957 − 12
Standard Practice for
1
Determining Surface Temperature of Molds for Plastics
This standard is issued under the fixed designation D957; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* the international system of units (SI) through a national
2
metrology institute (NMI) accurate to within 61.5°C shall be
1.1 This practice is intended for determining the tempera-
used.
ture at a specified point or points on the surface of the cavity
andbaseofamoldforplastics.Bydeterminingthetemperature 4.2 Non-Contact Pyrometer—A Radiation (infrared) Ther-
at as many points as deemed necessary, the overall temperature mometer that is traceable to the international system of units
2
condition of the surface can be determined. (SI) through a national metrology institute (NMI) accurate to
within 61.5°C shall be used. Radiation Thermometers with
1.2 The values stated in SI units are to be regarded as
selectable emissivity shall be set to the estimated emissivity of
standard. No other units of measurement are included in this
the surface to be measured. An emissivity correction shall be
standard.
made when using Radiation Thermometers with a preset
1.3 This standard does not purport to address all of the
emissivity.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
5. Procedure
priate safety and health practices and determine the applica-
5.1 The size, shape, and contours of a mold determine the
bility of regulatory limitations prior to use.
location and number of points at which temperature readings
NOTE 1—There is no known ISO equivalent to this standard.
are observed. Take temperature readings at as many points as
deemed necessary to determine the temperature condition of
2. Summary of Practice
the mold surface. At a minimum, it is suggested that tempera-
2.1 With the use of a calibrated surface or radiation (infra-
tures be measured at the mold center, near the edge, and at least
red) non-contact pyrometer, the overall temperature condition
two different but intermediate points between the center and
of a mold for plastics can be determined by taking readings at
edge.
a specified point or many points on the mold surface.
5.2 Place the thermocouple of the pyrometer at any speci-
3. Significance and Use
fied point on the surface of the cavity and base of the mold,
making certain that good contact is maintained between the
3.1 The properties of molded parts and the ease of produc-
two (see Note 2). Maintain contact until the scale reaches
ing satisfactory specimens are influenced by the temperature of
equilibrium.Recordthetemperaturereadingonthescaleatthis
the mold. It is desirable to know the actual mold temperature,
point.
which can differ from the mold temperature c
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D957 − 06 D957 − 12
Standard Practice for
1
Determining Surface Temperature of Molds for Plastics
This standard is issued under the fixed designation D957; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope*
1.1 This practice is intended for determining the temperature at a specified point or points on the surface of the cavity and base
of a mold for plastics. By determining the temperature at as many points as deemed necessary, the overall temperature condition
of the surface can be determined.
1.2 The values stated in SI units are to be regarded as standard. The values in brackets are given for information only.No other
units of measurement are included in this standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
NOTE 1—There is no similar ISO known ISO equivalent to this standard.
2. Summary of Practice
2.1 With the use of a calibrated surface or radiation (infrared) non-contact pyrometer, the overall temperature condition of a
mold for plastics can be determined by taking readings at a specified point or many points on the mold surface.
3. Significance and Use
3.1 The properties of molded parts and the ease of producing satisfactory specimens are influenced by the temperature of the
mold. It is desirable to know the actual mold temperature which may be different temperature, which can differ from the mold
temperature control medium.
3.2 The user should needs to be aware of temperature differences across the mold/thermocouple interface and at leads, and
should take appropriate precautions to minimize such differences.
4. Apparatus
4.1 Surface Pyrometer—A calibrated surface pyrometer traceable to temperature device designed to measure surface
2
temperatures that is traceable to the international system of units (SI) through a national metrology institutioninstitute (NMI)
standard and accurate to within 61.5°C shall be used.
4.2 Non-Contact Pyrometer—A Radiation (infrared) Thermometer that is traceable to the international system of units (SI)
2
through a national metrology institute (NMI) accurate to within 61.5°C shall be used. Radiation Thermometers with selectable
emissivity shall be set to the estimated emissivity of the surface to be measured. An emissivity correction shall be made when using
Radiation Thermometers with a preset emissivity.
5. Procedure
5.1 The size, shape, and contours of a mold will determine the location and number of points at which temperature readings
should be are observed. Take temperature readings at as many points as deemed necessary to determine the temperature condition
of the mold surface. At a minimum, it is suggested that temperaturetemperatures be measured at the mold center, near the edge
...
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