A mobile shredder for metal materials comprising a feeding device, a shredding mill with a plurality of hammers associated with a rotor, and a removal device and an actuating device are provided, wherein: the feeding device comprises a hopper and a shredder with a first toothed roller and a second toothed roller that rotates in the opposite direction to that of the first roller and at a greater speed. The actuating device comprises a single motor. A control system is also provided with a plurality of hydraulic pumps for moving the rollers and a hydraulic clutch with a variable flow for moving the rotor, the plurality of hydraulic pumps and the hydraulic clutch being joined to the motor. The control system is configured to modify the rotational speed of the toothed rollers based on the motor load associated with the shredding mill; and the devices are mounted on a frame.

This metal film and resin separation method is a method of putting synthetic resin waste in which a metal film adheres to a synthetic resin into a separation chamber in a casing, rotating a hammer rotor in the separation chamber, and separating and recovering the metal film and synthetic resin. While rotating the hammer rotor, the synthetic resin waste in the separation chamber is crushed, and a temperature in the separation chamber is increased to an exfoliation temperature which is higher than a normal temperature and less than a temperature at which the synthetic resin starts melting. While holding the temperature in the separation chamber at the exfoliation temperature, the synthetic resin waste is crushed and the metal film is exfoliated from the synthetic resin.

This metal film and resin separation method is a method of putting synthetic resin waste in which a metal film adheres to a synthetic resin into a separation chamber in a casing, rotating a hammer rotor in the separation chamber, and separating and recovering the metal film and synthetic resin. While rotating the hammer rotor, the synthetic resin waste in the separation chamber is crushed, and a temperature in the separation chamber is increased to an exfoliation temperature which is higher than a normal temperature and less than a temperature at which the synthetic resin starts melting. While holding the temperature in the separation chamber at the exfoliation temperature, the synthetic resin waste is crushed and the metal film is exfoliated from the synthetic resin.

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

Various embodiments of a hammermill system, hammer, and methods are disclosed. A hammermill hammer comprises a metal composite comprising a plurality of inserts and a body portion disposed between each of the plurality of inserts. The composition of the plurality of inserts is different than composition of the body portion. The material of the plurality of inserts has a greater abrasion resistance than the material of the body portion and the material of the body portion has a greater impact resistance than the material of the inserts. The hammers produced have improved wear resistance and longer useful life compared to conventional hammermill hammers.

Various embodiments of a hammermill system, hammer, and methods are disclosed. A hammermill hammer comprises a metal composite comprising a plurality of inserts and a body portion disposed between each of the plurality of inserts. The composition of the plurality of inserts is different than composition of the body portion. The material of the plurality of inserts has a greater abrasion resistance than the material of the body portion and the material of the body portion has a greater impact resistance than the material of the inserts. The hammers produced have improved wear resistance and longer useful life compared to conventional hammermill hammers.

A grinder for grinding relatively loose materials includes a reducing unit and a screen arrangement. The arcuate screen defines a plurality of tracks of apertures that extend in a cutting direction of the cutters. In some cases, only one respective cutter passes over each track and each cutter passes over only the respective one of the tracks. The width of a cutter may be greater than a width of the apertures of a track. The apertures of the screen arrangement may form chevron patterns. The screens may be clamped to a frame by coupling members extending through notches in the screen.

A grinder for grinding relatively loose materials includes a reducing unit and a screen arrangement. The arcuate screen defines a plurality of tracks of apertures that extend in a cutting direction of the cutters. In some cases, only one respective cutter passes over each track and each cutter passes over only the respective one of the tracks. The width of a cutter may be greater than a width of the apertures of a track. The apertures of the screen arrangement may form chevron patterns. The screens may be clamped to a frame by coupling members extending through notches in the screen.

Improved free-swinging hammermill hammer configurations are disclosed and described for comminution of materials such as grain and refuse. The hammer configurations of the present disclosure are adaptable to most hammer mill or grinders having free-swinging systems. The configurations as disclosed incorporate comminution edges having increased hardness for longer operational run times. The improved configurations improve installing, removing, and cleaning hammer components within the hammermill. More particularly, a method for replacing hammers and spacers includes pre-assembling hammers, spacers, hammer saddles, locking collars, or any combination thereof and temporarily attaching them to one another before placement onto a hammermill rod. Once placed on the hammermill rod, the temporary attachment is broken such that the hammers within the pre-assembled group may move freely with respect to one another.

A machine for comminuting laminated glass members, such as automotive windshields and architectural glass, comprises infeed rollers feeding the member over a breaker bar, where an impactor assembly breaks the glass into small fragments and the plastic disposed between layers of the glass member into larger fragments, so that a size-based separation may be employed. The speed of the infeed rollers is controlled responsive to the thickness of the glass member.