A grinder for grinding beans of plant-based products and generating a ground powder can include: a grinding chamber; a wheel motor having a shaft defining an axial direction; a rotating grinding wheel and a stationary grinding wheel housed in the grinding chamber, wherein the rotating grinding wheel is connected to the shaft of the wheel motor and is configured to rotate around the axial direction, and wherein the stationary grinding wheel is stationary against rotation and is configured to axially move in both ways in the axial direction; and a device for resetting position of the rotating and stationary grinding wheels. The device can include: a mechanism for axially moving the stationary grinding wheel; an electric motor, coupled to the mechanism, for actuating the mechanism; and a way to stop the electric motor as soon as a contact state is detected between the stationary and rotating grinding wheels.

A nozzle for a viscous food dispensing system configured to dispense a viscous food product includes a nozzle passage extending from a nozzle inlet to a nozzle outlet, and a first port positioned proximate the nozzle outlet. A valve insert is positioned within the nozzle passage between the nozzle inlet and the first port, and the valve insert includes a second port. The first port and the second port are configured to move between an open position and a closed position in which flow from the nozzle inlet to the nozzle outlet is restricted by the second port then restricted by the first port.

An experimental device for SDC of powder particle sizes in a disc mill system includes a screw feeding control device, a mill speed adjustment device, a disc gap servo control device, a sampling device, a laser particle analyzer, a control cabinet and an upper computer. A control method for the experimental device includes the following steps: 1) performing initial setting; 2) starting the disc mill system; 3) performing sampling through a sampling device; 4) detecting a actual PDF (probability density function) shaping of distribution of powder particle sizes through the laser particle analyzer; and 5) updating the initial setting through a SDC algorithm. The experimental device and method can verify a series of SDC algorithms, and provides good a better experimental platform for teaching and scientific research; and the shape of non-Gaussian distribution of output random variables of a stochastic distribution system can be effectively controlled.

Provided is a disc gap servo control device and method for a powder grinding system, which includes a disc powder grinding machine, a rotating speed regulating device of a rotating disc, the disc gap servo control device and a control cabinet. The method includes the following steps of: (1) inputting a control information; (2) an industrial computer obtaining a current disc gap and displaying the disc gap on a touch screen; (3) the disc gap servo control device adjusting the disc gap; (4) the current disc gap reaches a target disc gap; and (5) a frequency converter controlling a motor rotating speed, so that the actual rotating disc rotating speed can reach a target rotating speed of the rotating disc. The operation parameters of the rotating disc are observed by the industrial computer in real time, and finally a high-precision servo control of the disc gap can be realized.

Provided is a disc gap servo control device and method for a powder grinding system, which includes a disc powder grinding machine, a rotating speed regulating device of a rotating disc, the disc gap servo control device and a control cabinet. The method includes the following steps of: (1) inputting a control information; (2) an industrial computer obtaining a current disc gap and displaying the disc gap on a touch screen; (3) the disc gap servo control device adjusting the disc gap; (4) the current disc gap reaches a target disc gap; and (5) a frequency converter controlling a motor rotating speed, so that the actual rotating disc rotating speed can reach a target rotating speed of the rotating disc. The operation parameters of the rotating disc are observed by the industrial computer in real time, and finally a high-precision servo control of the disc gap can be realized.

The purpose of the present invention is to provide a cellulose acetate which can be used to obtain an optical film having a very small amount of bright spot foreign matters, with excellent production efficiency, even when cellulose containing a small amount of hemicellulose components and having a high degree of crystallinity is used as a raw material. A cellulose acetate in which a content ratio by mole of mannose units to a sum of xylose units, mannose units and glucose units, which are sugar chain components, is 0.04 mol % or less, and a filtration index K measured by the following measurement method is 30 mL.sup.1 or less. (Measurement method) The cellulose acetate is dissolved in a mixed solvent containing methylene chloride and methanol at a weight ratio of methylene chloride/methanol of 9/1 to obtain a solution with a solid concentration of 16% by weight. The temperature of the solution is adjusted to 25 C., and the solution is subjected to constant-pressure filtration under a pressure of 3 kg/cm.sup.2 using a cloth obtained by stacking three sheets of calico (s 618) (diameter: 15 mm, filtration area: 1.77 cm.sup.2). At this time, the filtration index k (mL.sup.1) is calculated from the following expression, where P.sub.1 represents the amount of filtration (mL) up to 20 minutes after the start of filtration, and P.sub.2 represents the amount of filtration (mL) from 0 to 60 minutes.

[00001]$\begin{array}{cc}\mathrm{Filtration}.Math..Math.\mathrm{index}.Math..Math.K=\frac{2-P_2/P_1}{P_1+P_2}{10}^4& \left[\mathrm{Mathematical}.Math..Math.\mathrm{Formula}.Math..Math.1\right]\end{array}$

A device for resetting the position of the grinding wheels in a grinder for beans of plant-based products, whose powder, resulting from grinding, is adapted for use in the preparation of a beverage, particularly coffee.

The grinder comprises a grinding chamber, a pair of grinding wheels housed in said grinding chamber, a grinding wheel being connected to the shaft of a motor, whose axis defines the axial direction (Z-Z) of the grinding wheels, to be rotated, the other grinding wheel, opposite thereto, being stationary against rotation and susceptible of being axially moved in both ways along said axial direction (Z-Z).

The device includes a mechanism for imparting said axial movements to the stationary grinding wheel, an electric motor for actuating said mechanism, a current intensity meter for measuring the current intensity absorbed by the electric motor and a switch for cutting off power to said electric motor upon detection of a value of the current intensity absorbed by said motor representative of zero distance state between the stationary grinding wheel and the rotating grinding wheel, opposite thereto.

A device for resetting the position of the grinding wheels in a grinder for beans of plant-based products, whose powder, resulting from grinding, is adapted for use in the preparation of a beverage, particularly coffee.

The grinder comprises a grinding chamber, a pair of grinding wheels housed in said grinding chamber, a grinding wheel being connected to the shaft of a motor, whose axis defines the axial direction (Z-Z) of the grinding wheels, to be rotated, the other grinding wheel, opposite thereto, being stationary against rotation and susceptible of being axially moved in both ways along said axial direction (Z-Z).

The device includes a mechanism for imparting said axial movements to the stationary grinding wheel, an electric motor for actuating said mechanism, a current intensity meter for measuring the current intensity absorbed by the electric motor and a switch for cutting off power to said electric motor upon detection of a value of the current intensity absorbed by said motor representative of zero distance state between the stationary grinding wheel and the rotating grinding wheel, opposite thereto.

A mill for grinding particles to submicron size. The mill has a rectangular prism-shaped housing for two internal barrels. Each internal barrel has a shaft and a plurality of overlapping circular discs attached to the shaft for grinding materials to submicron size. Each barrel also has blocked corners providing a cross-sectional shape of half of an octagonal prism disposed toward opposing ends of the housing. The housing also includes comprises curved acceleration ramps disposed between the barrels proximal to the overlapping circular discs on opposing sides of the housing. An inlet is provided for feeding material to be ground by the mill to an overlapped portion of the overlapping circular discs. An outlet is disposed at an end of the mill opposite the inlet for removing ground material from the mill. The overlapping circular discs are rotated in the mill at a shaft speed ranging from about 200 to about 1200 RPM.

A mill for grinding particles to submicron size. The mill has a rectangular prism-shaped housing for two internal barrels. Each internal barrel has a shaft and a plurality of overlapping circular discs attached to the shaft for grinding materials to submicron size. Each barrel also has blocked corners providing a cross-sectional shape of half of an octagonal prism disposed toward opposing ends of the housing. The housing also includes comprises curved acceleration ramps disposed between the barrels proximal to the overlapping circular discs on opposing sides of the housing. An inlet is provided for feeding material to be ground by the mill to an overlapped portion of the overlapping circular discs. An outlet is disposed at an end of the mill opposite the inlet for removing ground material from the mill. The overlapping circular discs are rotated in the mill at a shaft speed ranging from about 200 to about 1200 RPM.