CN1030137C - Wooden phenolic resin layer material and its manufacture method - Google Patents
Wooden phenolic resin layer material and its manufacture method Download PDFInfo
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- CN1030137C CN1030137C CN 93105062 CN93105062A CN1030137C CN 1030137 C CN1030137 C CN 1030137C CN 93105062 CN93105062 CN 93105062 CN 93105062 A CN93105062 A CN 93105062A CN 1030137 C CN1030137 C CN 1030137C
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Abstract
The present invention relates to a timber phenolic resin lamination material which comprises single glue-dipping longitudinal-line boards, single glue-dipping transverse-line boards, and single oil-coating glue-dipping boards, wherein metal nets can be arranged between the single glue-dipping boards. The present invention also relates to a method for manufacturing the lamination material, wherein the hot pressing process adopts a mode of staged pressure increase and continuous temperature rise. A bat made of the lamination material, particularly a goal bat stick, has the bulk weight of 1.32 to 1.5 grams/cm (3), and the brinell hardness of the end surface of the bat stick is from 286 to 306MPa (DHB).
Description
The present invention relates to the method for a kind of Wooden phenolic resin layer material and this lamination material of manufacturing, and adopt the bat that uses in the ball game of Wooden phenolic resin layer material manufacturing.
General existing bat is made up of excellent handle and wooden club.When the user impacts spheroid with bat, bump or friction perhaps will take place with ground in wooden club and spheroid.Particularly popularizing of croquet motion in recent years increased the demand of gate-ball mallet gradually.In the middle of motion or recreation, because the wooden club of gate-ball mallet is frequent and ground generation bump or friction, along with the batting number of times increases gradually, wooden club contacts partly more and more serious with the wearing and tearing of batting part with ground, finally cause gate-ball mallet to be scrapped fully.Therefore, existing gate-ball mallet is shorter usually service life, thereby makes consumption of materials higher.The well known materials that is used to make gate-ball mallet has impregnation nylon cloth, vulcanie, compressed wood and lamination wood.The common door bat unit weight made from above-mentioned material is low, hardness is little, and poor flexibility, property be crisp, easily split, not wear-resisting, poor water resistance.
In order to overcome above-mentioned defective, need to propose a kind of performance and should satisfy the material that the user requires, adopt this material can produce gratifying gate-ball mallet.Those skilled in the art has been made many trials for this reason.In Patent Office of the People's Republic of China's disclosed this piece of CN-2111126U patent documentation, put down in writing a kind of gate-ball mallet, wherein adopt polyethylene and nylon to make high strength and high-quality gate-ball mallet.The unit weight of this gate-ball mallet is low, and wearability and serviceability are all undesirable.
A kind of wooden lamination material is disclosed in another piece Chinese patent CN-1056834A.This lamination material is by forming through the veneer and the immersion oil veneer of dyeing behind the impregnation, and wherein to open dyeing impregnation veneer be one group to 5-10, placement one deck immersion oil veneer between every group of dyeing impregnation veneer.This material generally is used to make musical instrument, furniture, perhaps as ornament materials.Because hardness, wearability and the unit weight of this material are all undesirable, are not the good materials that is used to make gate-ball mallet.
One piece of U.S. Pat-5,026, a kind of wooden densified laminated wood material is disclosed in 593, wherein between the stratiform veneer, be provided with aluminium alloy layer.This material is suitable for making building element, for example wooden crossbeam and column.Because this material hardness is low, wear no resistance, unit weight is little, therefore is not the ideal material of making gate-ball mallet.
In order to overcome above-mentioned defective, prolong the service life of gate-ball mallet, key factor is to improve the hardness that is used to make the wooden club material, strengthens its wearability, strengthens unit weight.
The purpose of this invention is to provide a kind of long service life, the hardness height, the wooden lamination material that wearability is strong, unit weight is big is so that overcome above-mentioned defective.
Another object of the present invention provides a kind of method of making described wooden lamination material.
A further object of the invention utilizes wooden lamination material provided by the invention to produce a kind of bat exactly, makes this bat have gratifying effect.
Wooden phenolic resin layer material provided by the invention has the grain of wood and the vertical at least 4 roughly the same group impregnation rift grain veneers of slab, the grain of wood and slab be roughly the same evenly spaced at least 2 layers of impregnation face crossing laterally, thickness direction along described lamination material is provided with oiling impregnation veneer evenly distributedly, every layer of oiling impregnation veneer is arranged between the impregnation veneer, and the unit weight of described lamination material is 1.32～1.5 gram/cubic centimetres
3, end face Brinell hardness 285～306MPa(DHB).
Can also be provided with by diameter between the impregnation veneer is the wire netting that the metal wire rod of 0.2-0.5 millimeter is woven into.
The rift grain veneer group that the surface portion of described Wooden phenolic resin layer material is made up of 1-10 layer impregnation rift grain veneer.Thickness direction along described lamination material is provided with 4-20 group impregnation rift grain veneer group.1-10 layer impregnation rift grain veneer is arranged in every group of rift grain veneer.Along the thickness direction of described lamination material, evenly the compartment of terrain is provided with 2-19 layer impregnation face crossing, and 3-19 layer oiling impregnation veneer and 2-8 layer wire netting.
In described lamination material, impregnation rift grain veneer, impregnation rift grain veneer, oiling impregnation veneer, and total number of plies of wire netting is the 11-246 layer.
Described wire netting is steel mesh or copper mesh, its specification 25-30 order.In a kind of scheme provided by the invention, wire netting evenly is spaced apart and arranged in the central plane and the zone between bottom surface of described lamination material.Usually adopt this lamination material to make the croquet wooden club.In making the process of gate-ball mallet, the zone that will have wire netting usually as in the wooden club away from the part at place, excellent handle place, promptly described zone is the normal part that produces bump and rub with ground in wooden club.In other words, when Wooden phenolic resin layer material was made wooden club, the even compartment of terrain of described wire netting was positioned at wooden club central plane and the zone that surrounds away from the side at excellent handle place.Wooden club wearability height with this structure, good springiness, impact resistance is strong, and serviceability is good.
When making Wooden phenolic resin layer material of the present invention, the veneer of employing can be the rotary-cut plate or the slicing plate of 0.5-2.5 millimeters thick.The glue of dipping veneer is the water soluble phenolic sol solution of 25-60%, and the suction glue amount of veneer is 25-45%.In order to prevent that in manufacture process Wooden phenolic resin layer material from producing longitudinal crack, is provided with the impregnation face crossing along the even compartment of terrain of the thickness direction of lamination material.In order to overcome the crisp shortcoming of water soluble phenolic bakelite matter lamination material, in described Wooden phenolic resin layer material, along the thickness direction of material, evenly the compartment of terrain is provided with the impregnation veneer that the top layer is coated with organic oil.Added this impregnation veneer that is coated with apposition machine oil in the lamination material after, the lamination material fragility that produces is reduced greatly, toughness increases substantially, and resistance to water is further strengthened.The method of manufacturing Wooden phenolic resin layer material provided by the invention comprises following procedure of processing: selection, shearing, impregnation, display, drying, precompressed, assembly and hot pressing.
In the selection operation, adopt that thickness 0.5-2.5 millimeter veneer, material are even, smooth, solid colour, no knot, moisture content 5-8%, any surface finish.
In cutting operation, slab is cut into the size that needs with shear.
In the impregnation operation, adopt the water soluble phenolic glue of concentration 25-60%, Engler viscosity is 60-80, pH=7-9 vertically puts into steeping vat with veneer.Dipping is 8-20 hour under normal temperature, normal pressure, makes veneer inhale the glue amount and reaches 25-45%.
In displaying operation, the impregnation veneer that suction glue amount is reached specification requirement takes out from steeping vat, then described impregnation veneer is placed on the veneer support, drips at normal temperatures glue 30-50 minute.
In drying process, veneer is hung in the hothouse 60-80 ℃ of hothouse temperature, 1-3 hour drying time.The moisture content of dry back impregnation veneer is 3-6%.
In prepressing procedures, will in prepressing device, carry out precommpression through the impregnation veneer 20-200 of super-dry layer short grain assembly in batches.Temperature during precompressed is controlled at room temperature, and pressure is 2-4MPa, squeeze time 1-4 minute.Slab is through after the precommpression, and its gauge reduces, and the flatness of plate face improves, and is convenient to carry out postorder processing.
In the assembly operation, get impregnation rift grain veneer 4-200 layer.When the veneer number of plies that needs assembly for a long time, 1-10 layer veneer can be formed one group.Thickness direction along described lamination material is provided with 4-20 group impregnation rift grain veneer, and also even compartment of terrain is provided with 2-19 layer impregnation face crossing, and 3-19 layer oiling impregnation veneer and 2-8 layer wire netting.
In hot pressing process, adopt the staged supercharging mode at boost phase, promptly boost, pressurize, boost again, pressurize again, reach 12-17MPa up to pressure.Common boost phase, i.e. 0-t
1Be 30-50 minute during this period of time.At boost phase simultaneously, make temperature keep continuing to rise, reach 120-170 ℃ up to heating-up temperature.Temperature rise period, i.e. 0-t
2Time was generally 30-60 minute.Dwell time proportionately plate thickness be calculated as 3-7 minute/millimeter.After the packing stage, beginning step-down cooling.With the time working specification that adopts same as the prior art.After hot pressing process is finished, from hot-press arrangement, take out into plate.
The present invention also provides a kind of bat that adopts Wooden phenolic resin layer material of the present invention to make.The structure of this bat materials is described in front.The professional is appreciated that, Wooden phenolic resin layer material provided by the invention is not only applicable to make described gate-ball mallet, also be suitable for making the bat that uses in ball game or the recreation, for example similar equipment such as golf club, hockey stick, baseball bat, hockey stick, polo rod.When adopting described Wooden phenolic resin layer material to make this class sports equipment, can obtain the wearability height herein, hardness is big, good toughness, the advantage that elasticity is strong, unit weight is big.
Below in conjunction with accompanying drawing, embodiments of the invention are described in further detail.
Fig. 1 is the schematic diagram of a kind of Wooden phenolic resin layer material provided by the invention.
Fig. 2 is the schematic diagram of another embodiment of a kind of Wooden phenolic resin layer material provided by the invention.
Fig. 3 is a kind of thermal buckling line chart that adopts in the method for Wooden phenolic resin layer material of making provided by the invention.
Fig. 4 is the schematic diagram that adopts the gate-ball mallet that Wooden phenolic resin layer material provided by the invention produces, and wherein broken section represents that the wooden club of gate-ball mallet made by the lamination material.
The invention provides a kind of Wooden phenolic resin layer material; A kind of method of making described Wooden phenolic resin layer material also is provided; And the bat that adopts described Wooden phenolic resin layer material to make, more particularly, be a kind of gate-ball mallet.
Have four kinds of plane stratified materials in the Wooden phenolic resin layer material that provides among the present invention, i.e. impregnation rift grain veneer (1), impregnation face crossing (2), gluing impregnation veneer (3), and wire netting (4).
In a preferred embodiment, as illustrated in fig. 1 and 2, the quantity of impregnation rift grain veneer (1) is respectively more than the quantity of other three kinds of flaky materials.Impregnation rift grain veneer (1) is arranged in the Wooden phenolic resin layer material in groups.Form a veneer group by 5 layers of impregnation rift grain veneer (1).Be provided with 14 veneer groups in the present embodiment.Between each adjacent impregnation rift grain veneer group, be provided with one deck oiling impregnation veneer (3).What in the present embodiment, be coated in impregnation veneer surface is machine oil.13 layers of oiling impregnation veneer (3) are evenly distributed between the veneer group.Thickness along Wooden phenolic resin layer material is provided with 4 layers of impregnation face crossing (2) evenly distributedly.Even compartment of terrain is provided with 3 layers of wire netting (4) in the zone between the bottom surface (6) of the central plane (X) of described lamination material and lamination material.Described wire netting (4) is formed by the braided steel wire of 0.3 millimeter of diameter, and its specification is the 25-30 order.
In another preferred embodiment, as shown in Figure 2, in Wooden phenolic resin layer material, comprised described impregnation rift grain veneer (1), impregnation face crossing (2), top layer (5) is to bottom (6), and the arrangement of flaky material is: 1-5,7-9,11,13-17,19,21-23,25-27,29,31,33-35,37,39,41,43-48 layer are impregnation rift grain veneers (1); 6th, 12,18,24,36,42 layers is oiling impregnation veneer (3); 10th, 20,28,38 layers is impregnation face crossing (2); 32nd, 40 layers is that its specification is the 25-30 order by the wire netting (4) of the braided steel wire one-tenth of 0.3 millimeter of diameter.
The method of manufacturing Wooden phenolic resin layer material provided by the invention comprises following operation: selection, shearing, impregnation, display, drying, precompressed, assembly and hot pressing.Step by step the method for manufacturing Wooden phenolic resin layer material provided by the invention is described in detail below.
One, selection operation
Adopting thickness is 1.12 millimeters rotary-cut plate or slicing plate, and seeds are white birch, and material is even, smooth, solid colour, no knot, any surface finish, moisture content 5-8%.
Two, cutting operation
Adopt shear, for example plate shearing machine is cut into the size that needs with slab, for example: 30cm * 30cm.
Three, impregnation operation
Employing concentration is 50% water soluble phenolic glue, and Engler viscosity is 69, and pH=7.8, thin up vertically put into steeping vat to concentration 35% with veneer, and dipping is 14 hours under normal temperature, normal pressure, makes veneer inhale the glue amount and is approximately 35%.
Four, display operation
When the suction glue amount of veneer meets the requirements, promptly inhale the glue amount and be approximately at 35% o'clock, veneer is taken out from steeping vat, be placed on the veneer support, in the following glue of normal temperature condition 35 minutes.
Five, drying process
Veneer is through after displaying a period of time, is coated in no longer following basically of glue on the veneer, at this moment the veneer behind the impregnation hung in the hothouse, and under 70-75 ℃ of condition, drying 2 hours makes the veneer moisture content reach 3-6%.
Six, prepressing procedures
To carry out precompressed in prepressing device through 80 layers of the impregnation veneers of super-dry short grain assembly in batches, temperature is a room temperature, and pressure is 3MPa, squeeze time 2 minutes.
Seven, assembly operation
Get 70 layers of impregnation rift grain veneer (1) quantity, per 5 layers is one group, and being divided into is 14 groups.Between each adjacent impregnation rift grain veneer group one deck oiling impregnation veneer (3) is set, what be coated in impregnation veneer surface can be machine oil.The quantity of oiling impregnation veneer (3) comes to 13 layers.Along the slab thickness direction, evenly the compartment of terrain is provided with 4 layers of impregnation face crossing.Even compartment of terrain is provided with 3 layers of wire netting (4) in the zone between the bottom surface (6) of described lamination material central plane (x) and lamination material.Described wire netting (4) is formed by the braided steel wire of 0.3 millimeter of diameter, and its specification is the 25-30 order, and above-mentioned assembly form as shown in Figure 1.
Selectively assemble pattern is as shown in Figure 2 for another kind, to bottom (6), the arrangement of flaky material is: 1-5,7-9,11,13-17,19,21-23,25-27,29,31,33-35,37,39,41,43-48 layer are impregnation rift grain veneers (1) from the top layer (5) of lamination material; 6th, 12,18,24,36,42 layers is oiling impregnation veneer (3); 10th, 20,28,38 layers is impregnation face crossing (2); 32nd, 40 layers is that its specification is the 25-30 order by the wire netting (4) of the braided steel wire one-tenth of 0.3 millimeter of diameter.
Eight, hot pressing process
The slab that assembly is finished places hot press.Curve in Fig. 3 (p) is illustrated in the situation of change of pressure in the whole pressing cycle (p).Adopt the staged supercharging mode at boost phase, promptly boost, pressurize, boost again, pressurize again, reach 15MPa up to pressure, as shown in Figure 3, pressure (p) curve is at 0-t
1Express the special relationship of pressure (p) and time (t) during this period of time.Usually be 45 minutes during this period of time.In the present embodiment, adopt and boost for 6 times, make pressure rise to 15MPa from atmospheric pressure.In the time interval between at every turn boosting, promptly the dwell time is 7 minutes.At t
1-t
3Make pressure remain on 15MPa during this period of time.According to becoming plate thickness, press and determined in 2-6 minute/millimeter during this period of time, in the present embodiment, become 50 millimeters of thicknesss of slab, so determine that the dwell time is 200 minutes.t
3-t
4Be buck stage during this period of time, during this period of time the feature in the hot pressing curve that uses in the feature that has of pressure (p) curve and the prior art is roughly the same.t
4-t
5Represent during this period of time that pressure (p) curve reduces and unload plate.General cooling stage, i.e. t
3-t
5Be approximately 50 minutes during this period of time.The T curve table is shown in variation of temperature situation in the whole pressing cycle in Fig. 3.At boost phase, 0-t
1During this period of time, the temperature rising that remains a constant speed is simultaneously risen near 150 ℃ of maximum temperatures by room temperature.Reach t when the time
1Constantly, pressure (p) reaches peak, and this moment, temperature still kept ascendant trend.Reach t when the time
2, temperature rises to 150 ℃ of peaks.Common time t
1-t
2It is 10 minutes.t
2-t
3Time is holding stage, during this period of time, temperature is remained on about 150 ℃, and its time is approximately 190 minutes.t
3-t
5Time is cooling stage, and this moment, temperature was reduced to room temperature by the highest temperature.
The another kind of scheme that provides in the present invention is to adopt Wooden phenolic resin layer material to make the bat that uses in the ball game, for example golf club, hockey stick, baseball bat, hockey stick, polo rod.A kind of gate-ball mallet is provided in a preferred embodiment especially, and it comprises excellent handle (10) and wooden club (20).The roughly the same impregnation rift grain veneer (1) of longitudinal axis that comprises the grain of wood and wooden club (20) by the wooden club (20) of Wooden phenolic resin layer material manufacturing provided by the invention, between rift grain veneer (1), be provided with the grain of wood and roughly become horizontal impregnation face crossing (2) with the longitudinal axis of wooden club (20), oiling impregnation veneer (3), and wire netting (4).The rift grain veneer group of forming by 1-10 layer impregnation rift grain veneer (1) on the top layer of the Wooden phenolic resin layer material of described manufacturing wooden club (20).Thickness direction along described lamination material is provided with 8-20 group impregnation rift grain veneer group, and 1-10 layer impregnation rift grain veneer (1) is arranged in every group of rift grain veneer.Between adjacent impregnation veneer, be provided with one deck oiling impregnation veneer (3).Along the thickness direction of described lamination material, be provided with 7-19 layer oiling impregnation veneer (3) evenly distributedly.One deck impregnation face crossing (2) can be set between adjacent impregnation veneer.Along the thickness direction of described material, be provided with 4-19 layer impregnation face crossing (2) evenly distributedly.Between adjacent impregnation veneer, also be provided with layer of metal net (4).Along the thickness direction of described lamination material, turn up the soil and be provided with 2-8 layer wire netting (4) in the space.In a preferred embodiment, wire netting (4) evenly is spaced apart and arranged in the zone that wooden club central plane (x) surrounds away from the side (6) at excellent handle (10) place.
With reference to accompanying drawing technical scheme provided by the invention is described in further detail above.The content of these descriptions is not that the present invention is limited.Belonging to the various modifications of the present invention's design or the scheme of conversion all is documented in claims.
Claims (14)
1, a kind of Wooden phenolic resin layer material, wherein has vertically roughly the same impregnation rift grain veneer (1) of the grain of wood and slab, the grain of wood and slab be roughly the same evenly spaced at least 2 layers of impregnation face crossing (2) laterally, it is characterized in that: be provided with in groups at least 4 group impregnation rift grain veneers (1) evenly distributedly along the thickness direction of described Wooden phenolic resin layer material, every group of impregnation rift grain veneer (1) comprises 1～10 layer of veneer, be provided with one deck oiling impregnation veneer (3) between every group of impregnation rift grain veneer (1), the unit weight of described lamination material is 1.32～1.5 gram/cubic centimetres
3, end face Brinell hardness 285～306MPa.
2, according to the described Wooden phenolic resin layer material of claim 1, it is characterized in that: between the impregnation veneer, be provided with diameter and be the wire netting (4) that 0.2～0.5 millimeter metal wire rod is woven into.
3, according to the described Wooden phenolic resin layer material of claim 2, it is characterized in that: the rift grain veneer group that the surface portion of described Wooden phenolic resin layer material is made up of impregnation rift grain veneer (1), be provided with 4～20 groups of impregnation rift grain veneer groups along described lamination thickness direction, also evenly the compartment of terrain is provided with 2～19 layers of impregnation face crossing (2), and 3～19 layers of oiling impregnation veneer (3) and 2～8 layers of wire netting (4).
4, according to claim 2 or 3 described Wooden phenolic resin layer materials, its feature: in described lamination material, impregnation rift grain veneer (1), impregnation face crossing (2), oiling impregnation veneer (3), and total number of plies of wire netting (4) is 11～246 layers, and described wire netting (4) is steel mesh or copper mesh, its specification 25～30 orders.
5, according to the described timber phenolic aldehyde tree of one of claim 1～3 lamination material, it is characterized in that: in described lamination material, the glue of dipping veneer is 25～60% water soluble phenolic sol solution.
6, according to claim 2 or 3 described Wooden phenolic resin layer materials, it is characterized in that: wire netting (4) is evenly distributed in the zone between described lamination material central plane (x) and bottom surface (6).
7, a kind of method of making Wooden phenolic resin layer material, its procedure of processing comprises:
Selection, shearing, impregnation, display, drying, precompressed, assembly and hot pressing, it is characterized in that: in the assembly operation, be provided with in groups impregnation rift grain veneer (1) evenly distributedly along the thickness direction of described Wooden phenolic resin layer, every group of impregnation rift grain veneer (1) comprises 1～10 layer of veneer, 4～20 groups of impregnation rift grain veneers are set altogether, also evenly the compartment of terrain is provided with 2～19 layers of impregnation face crossing (12), and 3～19 layers of oiling impregnation veneer (3) and 2～8 layers of wire netting (4).
In hot pressing process, adopt the staged supercharging mode at boost phase, promptly to boost, pressurize is boosted again, and pressurize reaches 12～17MPa up to pressure again; At boost phase, temperature keep to continue is risen, reach 120～170 ℃ up to heating-up temperature, the dwell time proportionately plate thickness be calculated as 3～7 minutes/millimeter.
8, according to the described manufacture method of claim 7, it is characterized in that: in the selection operation, adopt 0.5～2.5 millimeter veneer of thickness, moisture content 5～8%.
9, according to the described manufacture method of claim 7, its feature is being: in the impregnation operation, adopt the water soluble phenolic glue of concentration 25～60%, Engler viscosity is 60～80, pH=7～9, veneer is vertically put into steeping vat, under normal temperature, normal pressure, flooded 8～20 hours, make veneer inhale the glue amount and reach 25～45%.
10, according to the described manufacture method of claim 7, it is characterized in that: at drying process, veneer is hung in the hothouse, 60～80 ℃ of baking temperatures, 1～3 hour drying time, the moisture content of dry back impregnation veneer is 3～6%.
11, a kind of bat that uses in the ball game of the described Wooden phenolic resin layer material manufacturing of claim 1 that adopts, described bat comprises excellent handle and wooden club, it is characterized in that: comprise impregnation rift grain veneer (1) in the wooden club, the unit weight that soaks face crossing (2), oiling impregnation veneer (3), wooden club is 1.32～1.5 gram per centimeters
3, end face Brinell hardness 286～306MPa.
12, according to the described bat of claim 1, it is characterized in that: described bat is a gate-ball mallet.
13, according to the described bat of claim 11, it is characterized in that: evenly the compartment of terrain is provided with 2～8 layers of wire netting (4) between the impregnation veneer.
14, according to the described bat of claim 12, it is characterized in that: the wire netting that is provided with in the wooden club of described gate-ball mallet (4) all is positioned at the central plane (x) of wooden club (20) and the zone that surrounds away from the side at excellent handle (10) place, in this zone, every layer of wire netting (4) is all spaced apart with distance about equally each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93105062 CN1030137C (en) | 1993-05-19 | 1993-05-19 | Wooden phenolic resin layer material and its manufacture method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93105062 CN1030137C (en) | 1993-05-19 | 1993-05-19 | Wooden phenolic resin layer material and its manufacture method |
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| CN1085149A CN1085149A (en) | 1994-04-13 |
| CN1030137C true CN1030137C (en) | 1995-10-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1046109C (en) * | 1995-12-05 | 1999-11-03 | 徐长天 | Prodn process of moulded wood door leaf |
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| CN104441100A (en) * | 2014-12-31 | 2015-03-25 | 桂林科技企业发展中心 | Composite plywood |
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| CN105150634A (en) * | 2015-07-31 | 2015-12-16 | 张家港市盛一包装有限公司 | Anti-compression packing-box glued board |
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-
1993
- 1993-05-19 CN CN 93105062 patent/CN1030137C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1046109C (en) * | 1995-12-05 | 1999-11-03 | 徐长天 | Prodn process of moulded wood door leaf |
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| CN1085149A (en) | 1994-04-13 |
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