The invention discloses a device and a method for online measuring a polymer melt rheological parameter. The device comprises a temperature control device, wherein a storage chamber is formed in the temperature control device; a piston is arranged above the storage chamber, and a plurality of capillary opening molds which are spaced to one another are sequentially arranged below the storage chamber from top to bottom; the storage chamber is connected to a fused plasticizing section of an extruder through a melt pump, the melt pump is used for introducing the polymer melt into the storage chamber from the fused plasticizing section of the extruder, and the polymer melt in the storage chamber can be sequentially extruded from a plurality of capillary opening molds under the extrusion of the piston. By adopting the device, the Bagley and Rabinowitsch correction can be synchronously carried out, the real shear viscosity of the material can be measured in real time, and the instantaneous tensile viscosity of the melt can be measured by utilizing a Cogswell method; in addition, the wall slippage phenomenon of the melt can be researched by replacing different capillary opening molds in different sizes. Compared with the traditional offline measurement method, the device and the method have the advantages that the rheological behavior of the material in a processing device can be really reflected.

Device and method for online measuring polymer melt rheological parameter

An apparatus (1) and method for optical inspection of a mass of polymeric material (2) passing through an extruder (3) having a hollow extrusion cylinder (4) extending elongately in a longitudinal direction comprises an optical sensor (8) which can be operatively coupled to the extrusion cylinder (4) and having an infrared light emitter (8a) and a receiver (8b) configured to measure a measurement parameter representing an optical property of the polymeric material (2) inside the extrusion cylinder (4) and is characterized in that it comprises a plurality of the optical sensors (8) which can be operatively coupled to the extrusion cylinder (4) in a plurality of measurement sites located in succession and spaced from each other along the longitudinal direction and a processor (9) programmed to acquire plurality of measurement signals containing the measurement parameters measured by the corresponding optical sensors (8) and programmed to process the plurality of measurement signals in order to calculate a corresponding plurality of values of a control parameter indicating a physical state of the polymeric material (2) as a function of a longitudinal position.

Optical inspection apparatus and method for an extruder

The invention discloses a polymer melt property near infrared spectrum on-line measuring device and method; the device comprises an extruding machine and a detection die arranged at the outlet of the extruding machine, a melt channel is formed in the detection die; the detection die is provided with a transmission type optical fiber probe By arrangement of the transmission type optical fiber probe on the detection die, a melt passes through the melt channel in the detection die, light with different wavelength is shot into a to-be-measured melt by the transmission type optical fiber probe through a transparent window arranged on the die, fed back optical signals are received by the transmission type optical fiber probe, then a computer data acquisition processor is used for data acquisition and analysis processing, then spectral signals containing to-be-measured melt property information are introduced into an established related model, dispersibility, content and substrate adhesion strength of each component of the to-be-measured melt can be calculated by the established related model, and on-line measuring of polymer blend or polymer matrix composite melt properties can be achieved

Polymer melt property near infrared spectrum on-line measuring device and method

The invention discloses a single-feed-cylinder capillary rheometer. A feed cylinder of the capillary rheometer is a single feed cylinder; the front end of the feed cylinder is provided with a plunger, the rear end of the feed cylinder is provided with a traveling nut, an electric heater is arranged around the feed cylinder, a long capillary die, a support part and a zero-length capillary die/short capillary die are arranged in the feed cylinder, and the outer diameter of the long capillary die, the outer diameter of the zero-length capillary die/short capillary die and the outer diameter of the support part all are matched with the inner diameter of the feed cylinder. The single-feed-cylinder capillary rheometer can be used for measuring extensional flow and shear flow parameters of polymer melt simultaneously, can eliminate entry pressure drop well, has the same function as a double-feed-cylinder capillary rheometer, and also has the advantages of saving raw materials, facilitating dismounting, purging easily, reducing artificial influences, realizing higher precision, and the like.

Single-feed-cylinder capillary rheometer

The invention relates to a measuring nozzle for determining the extensional viscosity of polymer melts while processing the polymer melts, comprising a flow channel which has a rectangular cross-section and which has a transitional section (3) between an inlet section (1) and an outlet section (2) with respective constant cross-sections. The transitional section tapers hyperbolically in the flow direction (8) between two opposing channel walls (6 or 7). The aim of the invention is to achieve advantageous measuring conditions. This is achieved in that the transitional section (3) comprises an inlet-side zone (4), in which the mutual distance between the two channel walls (7) between the two hyperbolic channel walls (6) decreases constantly in the flow direction (8), and an outlet-side zone (5) which adjoins the inlet-side zone and in which two of the channel walls (6, 7) lying opposite one another in pairs run parallel to each other while the two channel walls (7) arranged therebetween converge hyperbolically in the flow direction (8).

Measuring nozzle for determining the extensional viscosity of polymer melts

The utility model discloses a polymer melt property near infrared spectrum on-line measuring device The polymer melt property near infrared spectrum on-line measuring device comprises an extruder and a detection mold arranged at an outlet of the extruder, wherein a melt channel is formed in the detection mold A transmission-type optical fiber probe is arranged on the detection mold, the transmission-type optical fiber probe is mounted on the detection mold, melt is fed through the melt channel in the detection mold, subsequently the transmission-type optical fiber probe emits lights with different wavelengths into the melt through a transparent window formed in the mold to be measured, a light signal which is fed back is received through the transmission-type optical fiber probe, data is acquired and analyzed by using a computer data acquisition processor, and spectral signals with the property information of the melt to be measured are led into an established relevant model, so that the dispersity and the contents of the components of the measured melt as well as the binding force between the components of the measured melt and matrix can be calculated through the model, and real-time measurement on the property of melt of polymer blend or polymer-based composite materials is achieved

Polymer melt property near infrared spectrum on-line measuring device

The utility model discloses a device for measuring rheological parameters of a polymer melt on line. The device comprises a temperature control device, wherein a storage chamber is formed in the temperature control device; a piston is arranged above the storage chamber; multiple spaced capillary opening dies are sequentially arranged below the storage chamber from top to bottom; the storage chamber is connected with a melt plastification section of an extruder through a melt pump; the polymer melt is introduced into the storage chamber from the melt plastification section of the extruder through the melt pump, and by the extrusion of the piston, the polymer melt in the storage chamber is sequentially extruded from the multiple capillary opening dies. According to the device, Bagley and Rabinowitsch correction can be simultaneously performed to measure the actual shear viscosity of the material in real time, the instantaneous extensional viscosity of the melt can be measured by a Cogswell method, and in addition, the capillary opening dies with different sizes can be replaced for researches on the wall slip phenomenon of the melt; compared with the conventional offline measurement, the device has the advantage that the rheological behavior of the material in processing equipment can be actually reflected.

Lin Xiaokai

Papers

Device and method for online measuring polymer melt rheological parameter

Polymer melt property near infrared spectrum on-line measuring device and method

Polymer melt property near infrared spectrum on-line measuring device

Device for measuring rheological parameters of polymer melt on line