Solid Milk And The Method Of Manufacturing Thereof

Abstract

The object of invention is to provide solid milk with favorable solubility and enough strength and the method of manufacturing the solid milk. The solid milk of the invention has X-ray diffraction pattern of its surface area that has a main peak of 2θ=10-15° at 2θ=10-11° or at 2θ=12-13°. A method for the manufacture of solid milk comprises compressing powdered milk to obtain compressed powdered milk; humidifying the compressed powdered milk to obtain humidified compressed powdered milk; and drying the humidified compressed powdered milk to obtain the solid milk. A part of amorphous lactose at the surface of the solid milk 12 is crystallized at the steps of humidifying step and drying.

1 . A method for the manufacture of solid milk, the method comprising steps of:
 compressing powdered milk so as to obtain solid compressed powdered milk;   humidifying the compressed powdered milk so as to obtain humidified compressed powdered milk; and   drying the humidified compressed powdered milk so as to obtain the solid milk,   wherein a part of amorphous lactose at the surface of the solid milk is crystallized at the steps of humidifying step and drying,   wherein the powdered milk comprises 0.5 wt % to 10 wt % of crystalline lactose,   wherein the powdered milk comprises more than 40 wt % of lactose,   wherein the solid milk has 0.2 mm or more of a hard layer at the surface of the solid milk, and   wherein the hard layer comprises more than 10 wt % of crystalline lactose.   
     
     
         2 . A method for the manufacture of solid milk, the method comprising steps of:
 compressing powdered milk so as to obtain solid compressed powdered milk;   humidifying the compressed powdered milk so as to obtain humidified compressed powdered milk; and   drying the humidified compressed powdered milk so as to obtain the solid milk,   wherein a part of amorphous lactose at the surface of the solid milk is crystallized at the steps of humidifying step and drying,   wherein the powdered milk comprises more than 40 wt % of lactose,   wherein the solid milk has 0.5 mm or more of a hard layer at the surface of the solid milk, and   wherein the hard layer comprises more than 10 wt % of crystalline lactose.   
     
     
         3 . The method for the manufacture of solid milk in accordance with  claim 1 ,
 wherein the surface of the solid milk has X-ray diffraction pattern that has a main peak of 2θ=10-15° at 2θ=10-11° or at 2θ=12-13°.   
     
     
         4 . The method for the manufacture of solid milk in accordance with  claim 1 ,
 wherein the step of humidifying is a step for keeping the compressed powdered milk under humidity of 60% RH to 100% RH atmosphere for 5 seconds to 1 hour, and   wherein the step of drying is a step for keeping the humidified compress powdered milk under humidity of 0% RH to 30% RH atmosphere for 0.2 minute to 2 hours.   
     
     
         5 . The method for the manufacture of solid milk in accordance with  claim 1 ,
 wherein the powdered milk comprises more than 20 wt % of amorphous lactose.   
     
     
         6 . The method for the manufacture of solid milk in accordance with  claim 1 ,
 wherein the powdered milk comprises added crystalline lactose.   
     
     
         7 . The method for the manufacture of solid milk in accordance with  claim 1 ,
 wherein the powdered milk obtains crystalline lactose by humidifying and drying granules of ingredients of the powdered milk.   
     
     
         8 . The method for the manufacture of solid milk in accordance with  claim 1 ,
 wherein the method further comprises a step of cooling the concentrated milk before the step of drying such that the powdered milk obtains crystalline lactose.   
     
     
         9 . The method for the manufacture of solid milk in accordance with  claim 1 ,
 wherein the volume of the solid milk is from 1 cm 3  to 50 cm 3 .   
     
     
         10 . The method for the manufacture of solid milk in accordance with  claim 1 ,
 wherein the fat content of the powdered milk is 5 wt % to 70 wt %.   
     
     
         11 . The method for the manufacture of solid milk in accordance with  claim 1 ,
 wherein the protein content of the powdered milk is 12 wt % to 15 wt %.   
     
     
         12 . The method for the manufacture of solid milk in accordance with  claim 1 ,
 wherein the sugar content of the powdered milk other than lactose is less than 10 wt %.   
     
     
         13 . The method for the manufacture of solid milk in accordance with  claim 1 ,
 wherein the water content of the powdered milk is 1 wt % to 4 wt %.   
     
     
         14 . The method for the manufacture of solid milk in accordance with  claim 1 ,
 wherein the porosity of the center area ( 11 ) of the solid is 30% to 50%.   
     
     
         15 . The method for the manufacture of solid milk in accordance with  claim 1 ,
 wherein non-dissolved remaining of the solid milk, under following measurement condition of solubility, is 10 g or less.   [Measurement condition of solubility]   Two pieces of solid milk (11.2 g) are poured into a baby bottle. Then 80 g (80 mL) of hot water (test solution) is poured into the baby bottle to obtain liquid with 14 wt % of concentration of solute and kept the liquid in calm for 10 seconds. The baby bottle is boiled for 5 second with rotating the baby bottle by hand so that the trajectory of the baby bottle became a circle (4 revolutions per second). 5 seconds later, all of the contents in the babbly bottle are poured onto a sieve. The sieve has 32 mesh with openings of 500 μm. Weight [g] of non-dissolved remaining is measured.   
     
     
         16 . The method for the manufacture of solid milk in accordance with  claim 1 ,
 wherein the solid milk has hardness of 40N or more.   
     
     
         17 . The method for the manufacture of solid milk in accordance with  claim 1 ,
 wherein the amount of crystalline lactose at the surface of the solid milk is more than 5 wt % larger than that of crystalline lactose at center area of the solid milk.   
     
     
         18 . The method for the manufacture of solid milk in accordance with  claim 1 ,
 wherein the amount ratio of crystalline lactose and amorphous lactose at the surface of the solid milk is 25:75 to 90:10, and   wherein center area does not contain crystalline lactose or, the amount ratio of crystalline lactose and amorphous lactose at the center area of the solid milk is less than 10:90.