打包機是一種農(nóng)業(yè)機械,它用于壓縮已切割和傾斜的作物（如草、稻草或青貯飼料）成易于處理、運輸和儲存的小包。常用的打包機有幾個不同類型,分別生產(chǎn)不同類型的包-矩形的、圓柱形的,大小各不相同,用麻繩、網(wǎng)或金屬絲纏繞起來。工業(yè)打包機還可以用在材料回收設備上,主要用于包裝需要運輸?shù)慕饘?、塑料或紙?br>圓形打包機
在工業(yè)化國家最常用的打包機是這種又大又圓的打包機。它生產(chǎn)圓柱狀的“圓”或“筒狀”的包。草在打包機內(nèi)被捲起，使用橡膠帶、固定滾筒,或兩者的組合。當包達到規(guī)定尺寸時,用網(wǎng)或麻繩裹住它,以保持其固有的形狀。打包機的后面打開,包被排出。包在這個階段完成,但也可以用塑料薄膜包裹,當在室外儲存時能保持干草的干燥或者將潮濕的草變成青貯飼料。可變倉打包機通常生產(chǎn)直徑為48至72英寸（120~ 180厘米）、寬達60英寸（150厘米）的包。無論在任何地區(qū)，這些包可以重達1100至2200磅（500 -1000公斤），包的重量取決于大小，材料，和水分含量。
Baler
A baler is a piece of farm machinery used to compress a cut and raked crop (such as hay, straw, or silage) into compact bales that are easy to handle, transport and store. Several different types of balers are commonly used, each producing a different type of bales – rectangular or cylindrical, of various sizes, bound with twine, netting, or wire. Industrial balers are also used in material recycling facilities, primarily for baling metal, plastic, or paper for transport.
Round baler
The most frequently used type of baler in industrialized countries is the large round baler. It produces cylinder-shaped "round" or "rolled" bales. Grass is rolled up inside the baler using rubberized belts, fixed rollers, or a combination of the two. When the bale reaches a predetermined size, either netting or twine is wrapped around it to hold its shape. The back of the baler swings open, and the bale is discharged. The bales are complete at this stage, but they may also be wrapped in plastic sheeting by a bale wrapper, either to keep hay dry when stored outside or convert damp grass into silage. Variable-chamber balers typically produce bales from 48 to 72 inches (120 to 180 cm) in diameter and up to 60 inches (150 cm) in width. The bales can weigh anywhere from 1,100 to 2,200 pounds (500 to 1,000 kg), depending upon size, material, and moisture content