摘要:Veneer rotary cutting of 7 poplar wood species under different conditions weretested and the basic density,moisture content,hardness,MOE and MOR of the poplars testedwere determined. The MOE and MOR were measured on condition that grain direction wasperpendicular to the span.The hardness, MOE and MOR under different hot-water treatmentconditions were tested.Testing results showed that the veneer quality of poplar woods test-ed,except Hebei poplar,was satisfied under conditions of knife grinding angle 19°, clearanceangle 40′and the nose-bar opning 84%~92%without hot-water treatment.Physic-mechani-cal properties,especially MOE and MOR,of the poplar woods had considerable effects on ve-neer quality and determination of veneer rotary cutting conditions.Woods with 200 MPa ofMOE and ratio 2.2%of MOR to MOE were proved to be suitable for veneer rotary cutting.
关键词:Poplar;peeling;Quality of veneer;Wood properties
摘要:A method of setting and storing of parameters for press controlled with pro-grammable logical controller is introduced. According to this design, 20 pressing curves couldbe stored in the memory of PLC. Each curve is divided into 20 sections, The 20th section,which is not allowed to change by users for safety of operation,is a fixed step for opening ofthe press. Parameters for all the other 19 sections storing in the memory can be set by usersand be retrieved for use.
摘要:This paper was mainly concerned with the theoretical analysis of quantitative pa-rameters and described how the run-out of a circtilar saw and its rigidity in a given overload-ed condition were applied in assessment of levelling and distribution of tensioning Strees. Thedetecting system developed with 8031 single chip computer as its core was also described.The experiments of applying the method with the detecting system to a variety of circu-lar saws used for wood cutting and to large-sized diamond saws showed that this methodwith the system could be used in industrial operation with great feasibility.
摘要:This article described the principle of humidification treatment of particleboardmat surface,which proved to be effective in shortening hot-pressing cycle.The major factorsof humidification treatment were hot-pressing temperature,humidifying content and thick-ness ratio of humidified layer.