EP0226163A2 - Process for producing molded wooden products having a hole therein - Google Patents
Process for producing molded wooden products having a hole therein Download PDFInfo
- Publication number
- EP0226163A2 EP0226163A2 EP86117081A EP86117081A EP0226163A2 EP 0226163 A2 EP0226163 A2 EP 0226163A2 EP 86117081 A EP86117081 A EP 86117081A EP 86117081 A EP86117081 A EP 86117081A EP 0226163 A2 EP0226163 A2 EP 0226163A2
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- EP
- European Patent Office
- Prior art keywords
- mold
- mass
- mandrel
- mixture
- hole
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
- B27N3/20—Moulding or pressing characterised by using platen-presses
- B27N3/22—Charging or discharging
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
- B27N3/20—Moulding or pressing characterised by using platen-presses
Definitions
- the present invention relates to a process for producing molded wooden products and, more specifically, to a process for producing a molded wooden product by placing a fibrous mixture comprising wood fiber, a binder, water-repelling agent, etc., into a compression mold and subjecting it to heat-compression molding.
- Molded wood products e.g. hardboard
- Processes for producing molded wooden products typically involve the following steps. First, wood chips are steamed at 160 to 180°C in the steaming tank of a defibrator (wood splitting machine) until they are soft enough for disintegration. The steamed wood chips are then defibrated by a splitting or defibrating disk. The defibrated wood fiber is dried by hot air, and the dried wood fiber is incorporated with long fibers (e.g., hemp fiber or polypropylene fiber) to improve the deep drawing properties, a binder (e.g., phenolic resin), and a water-repelling agent (e.g., rosin and paraffin).
- long fibers e.g., hemp fiber or polypropylene fiber
- a binder e.g., phenolic resin
- a water-repelling agent e.g., rosin and paraffin
- the resulting fibrous mixture is accumulated to form a mat with a predetermined thickness, followed by slight compression with heating.
- the resulting product is a mat 10 to 40 mm thick, which is easy to store and transport.
- the mat is cut to a proper size and the trimmed mat is placed in a compression mold for heat compression molding at 180 to 220°C.
- the molded wooden product is finished by trimming away excess portions.
- the above-mentioned process for producing molded wooden products has the following disadvantages.
- the wood fiber must be formed into the mat, and the mat must be cut to a predetermined shape. These steps make the production process complex, and result in lowered productivity.
- the mat must be cut to a size slightly larger than the finished product. This cutting or trimming required before and after molding wastes the material, which leads to poor yields and increased production costs.
- expensive hemp fiber for example as much as 17%) generally must be incorporated into the mat. Where hemp fiber is used, it is necessary to add an extra amount of binder, e.g., synthetic resin. This also leads to increased production costs.
- the molded wooden product as described above is typically finished by forming a hole into which an object is later installed. This requires a special apparatus and adds to the manufacturing steps. This again leads to increased production costs.
- the hole is usually formed by punching, which makes the periphery of the punched hole weak and gives it a poor appearance, for example, from burrs.
- an advantage of the present invention is that it simplifies the production steps and improves yield.
- a process for producing a molded wooden product from a fibrous mixture comprising wood fibers, a binder, a water-repelling agent, and other optional additives,.
- the fibrous mixture is placed into a compression mold and heat-compression molding is performed.
- the fibrous mixture may be placed directly in the mold or may be formed into a mass of predetermined shape in such a manner that a first mandrel formed in the mold displaces the mixture, and a hole is thereby formed in the molde wooden product.
- the wood fiber used in this invention is obtained, for example, by defibrating or splitting wood chips.
- the wood used is not limited to a specific type and may, for example, include Japanese cypress, Japanese red pine, Japanese cedar, Japanese beech, and luaun.
- rice staws, flax husks, and bagasse may be used.
- the process of defibration or splitting is not limited to a specific method. For example, splitting may be accomplished by steaming wood chips and mechanically disintegrating them.
- the binder to be added to the wood fiber is not limited to specific type provided it can supplement the interfiber bonding properties inherent in the wood fibers.
- the binder include thermoplastic resins such as coumarone resin and thermosetting resins such as phenolic resin and urea resin.
- a water-repelling agent may also be incorporated with the wood fibers (in addition to the binder) to improve water resistance and promote mold release.
- An example of a water-repelling agent is paraffin, but any agent which provides enhanced water-repelling properties may be used.
- the fibrous mixture may be introduced into a cavity formed by the upper mold and the lower mold of an opened compression mold by means of an air flow.
- the mixture may be formed into a mass of predetermined shape prior to placing it in the mold.
- a hole may be formed in the mass at the position corresponding to a first mandrel incorporated into the mold, and the mass may be placed in the mold such that the first mandrel fits into the hole.
- the mixture placed in the mold is integrally bonded and formed.
- the molding conditions may be properly established depending on the materials (e.g., wood fiber and binder) used, and the desired shape and strength of the resulting molded wooden product. They are not generally limited to specific values.
- the molding temperature may range from 100 to 200°C
- the molding pressure may range from 20 to 80 kg/cm 2
- the molding cycle may range from 20 seconds to 10 minutes.
- the mixture may be placed directly into the mold or it may be formed into a mass of predetermined shape. Therefore, the process of the invention allows the omission of the mat-construction step and consequently simplifies the manufacturing steps.
- the molded wooden product Upon demolding, the molded wooden product has a hole formed in situ by the first mandrel. Thus, the step of forming a hole after molding may be omitted.
- a fibrous mixture of extremely low density may be used, which improves moldability. The density of the mixture is increased in the vicinity of the first mandrel, which results in high quality products.
- the improved moldability makes it possible to use less binder and reduces the need to add expensive fibers such as hemp fibers, both of which contribute to reducing production costs.
- Figs. 1 and 2 show the structure of a compression mold used to practice the process of this invention for producing the molded wooden products.
- the compression mold comprises an upper mold 1 and a lower mold 2, which are provided with the hot plates 3 and 4, respectively.
- the upper and lower molds also have gas vent ducts (not shown) for evacuating gases from a cavity formed by the upper and lower molds during the molding process.
- the lower mold 2 is surrounded by a frame 5 which extends beyond the top o the lower mold 2 so that a cavity is formed on the lower mold 2 to contain the fibrous mass W.
- the upper mold 1 can slide along the inner periphery of the frame 5.
- the lower mold 2 is provide with a first mandrel 6.
- the upper mold 1 has a receptacle 7 intd which the mandrel 6 is inserted.
- the first mandrel 6 is provided at a location corresponding to the position of the hole in the molded wooden product P (Fig. 2).
- the mandrel 6 has a diameter approximately equal to that of the hole.
- the mass W used in this example is one which has an extremely low density. It is produced from a fibrous mixture M comprising wood fiber (e.g., defibrated wood chips), a binder (e.g., phenolic resin) and a water-repelling agent (e.g., paraffin).
- the fibrous mixture M may be fed to a mass forming apparatus (shown in Figs. 3 and 4 and discussed below) in which a mass W of predetermined shape is formed.
- the mass W has a hole Wl into which the mandrel 6 is inserted.
- the upper ram of the mold (not shown) is forced downward so that the mass W is compressed.
- the wood fibers become more densely interlaced and the molding pressure increases.
- the wood fibers are not well interlaced and are highly fluid. Therefore, they can undergo deep drawing without the occurrence of molding defects such as thinning and cracking.
- a molded wooden product P having a high density and a predetermined thickness (e.g., 2 to 6 mm) is obtained as shown in Fig. 2.
- a hole of desired size and shape is formed at the place where the first mandrel 6 was positioned.
- the portion of the mass W which surrounds the first mandrel 6 becomes denser than the remaining portions of the mass. Therefore, the periphery of the hole in the molded wooden product P has a correspondingly higher density and is stronger than the other parts of the product.
- the mass forming apparatus used to obtain the mass W is shown in Figs. 3 and 4.
- the mass forming apparatus 11 is comprised of a spreading vessel 12 and a collecting vessel 13 positioned beneath the spreading vessel.
- the spreading vessel is comprised of, for example, iron sheet, and forms a pyramidal or conical roof over the collecting vessel.
- the collecting vessel 13 is designed to permit the fibrous mixture M to accumulate therein.
- At the top of the spreading vessel 12 is an opening 12a.
- a spreading unit 14 to spread the fibrous mixture M fed through a pressure feed pipe (not shown).
- air blowers 15 having air nozzles (not shown) on the inside thereof. The air nozzles control the spreading direction for the mixture in two dimensions.
- the air blowers 15 are supplied with air through th air supply lines 19 and the switch valve 20.
- the bottom of the collecting vessel 13 is connected a vacu duct 13a to apply a vacuum to the vessel 13.
- a first preforated member 16 such as wire net or a punched metal plate is provided to shape the bottom surface of the mass W.
- the collecting vessel 13 is also provided with the height sensors 17, which are arranged on the wall of the collecting vessel and above the first perforated member 16. The height sensors 17 are used to control the upper profile of the mass as required.
- a second mandrel 18 extends from the bottom of the collecting vessel through the perforated member 16.
- the second mandrel 18 has an outside diameter equal to or slightly less than that of the mandrel 6 attached to the lower mold 2.
- the second mandrel 18 is positioned at a place corresponding to that of the first mandrel 6.
- the mass forming apparatus 11 constructed as described above operates in the following manner to form the mass W.
- air is supplied to the air blowers 15 through the air supply lines 19, so that an air flow is created across the spreading vessel 12 and the collecting vessel 13.
- the fibrous mixture M is released from the opening 12a of the spreading vessel 12 and fed into the air flow.
- the mixture descends to the collecting vessel 13 and accumulates on the firs perforated member 16.
- the mixture M can be accumulated at desired positions of the perforated member 16 by controlling the air flow from the air blowers 15. This control is generally accomplished by switch valve 20.
- the accumulation of the mixture M is promoted by applying a vacuum to the bottom of the collecting vessel 13 through the vacuum duct 13a.
- the accumulation of the mixture M continues until one of th height sensors 17 on the wall of the collecting vessel 13 detect the predetermined amount of accumulation.
- the switch valve 20 i controlled so that the mixture M accumulates at different places until the other height sensors detect a predetermined amount of accumulation. This procedure is repeated until all the height sensors 17 detect predetermined amounts of accumulation.
- the supply of the mixture M and the supply of air through the air supply lines 19 are terminated.
- a mass W with the desired shape is thus obtained. Being a mere accumulation, the mass W has an extremely low density, and it has a thickness 20 to 120 times that of the final molded wooden product.
- the mass W prepared as described above is then transferred to the mold for heat-compression molding according to the following procedure.
- the collecting vessel 13 is disengaged from the spreading vessel 12.
- the holding vessel 21 is fitted to the collecting vessel 21.
- the holding vessel 21 has a second perforated member 22 (also made of wire net or the like) which matches the upper profile of the mass W.
- the top of the holding vessel 21 is connected to an exit port 23.
- the hole Wl is formed at a place where the second mandrel 18 was positioned as shown in Fig. 6.
- the holding vessel 21 is brought to a position directly over the compression mold by a transfer means (not shown). At the correct position, the vacuum is terminated, allowing the mass W to fall into the lower mold 2.
- the fibrous mixture M is formed into a low-density mass W.
- the mixture M which is the raw material of the mass W
- F ig. 7 shows an embodiment of the apparatus used to feed the mixture M directly into the mold.
- the feeding apparatus 30 comprises a feeding container 31 and a pressure container 32.
- the former communicates with the latter through the opening 33 which is opened and closed by a masking plate 35 actuated by cylinder 34.
- the feeding container 31 has an inlet 36 at the top for receiving the mixture M.
- a pair of rotatable bush wheels 37 are mounted above the opening 33.
- the pressure container 32 is connected at one end thereof to an air supply means (not shown) and the other end thereof to the heat-compression mold (as shown in Figs. 1 and 2).
- a weighing plate 38 connected to a load cell (not shown) is mounted under the opening 33.
- the frame 5 of the mold has two opposing openings 39 and 40.
- the first opening 39 is connected to the pressure container 32, and the other opening 40 is open to the atmosphere.
- the height of the openings 39 and 40 corresponds to the cavity 41 of the I partially closed mold, and the openings have a width adequate to fit the molded wooden product.
- the frame 5 has side plates 42 and 43 which open and close the openings 39 and 40, respectively.
- Fig. 8 is a front view of the side plate 42. It has a feeding port 44 which is about the same size as the opening 39.
- the window 42 of the sliding door 43 for the second opening 40 is provided with the wire net 45.
- Each of the side plates 42 and 43 is provided at the lower end thereof with a rack 46.
- a motor 48 is fixedly mounted on a bracket 47 projecting from the frame 5.
- the output shaft of the motor 48 is provided with the pinion 49 which engages with the rack 46.
- the doors 42 and 43 are horizontally movable by the driving force of the motor 48, so that the openings 39 and 40 are opened and closed as required.
- the mixture M fed into the feeding container 31 through the inlet 36 is discharged through the opening 33 by the aid of the rotating brush wheels 37.
- the discharged mixture accumulates on the weighing plate 38 in the pressure container 32.
- the cylinder 34 is actuated and the opening 33 is closed by the masking plate 35.
- air is supplied in the direction of the arrow A by the air supply means.
- the mixture M which has accumulated on the weighing plate 38 is forced into the cavity 41 by the air flow.
- the mixture M introduced into the mold cavity is contained by the wire net 45. Air passes in the direction of arrow B through the wire net 45.
- the cavity 41 is thus filled with the mixture M.
- the motor 48 moves the doors 42 and 43 which close the first and second openings 39 and 40, respectively.
- compression molding is carried out in the same manner as explained with reference to Figs. 1 and 2.
- the high-quality molded wooden product P having a hole as in the above-mentioned examples is obtained.
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Abstract
Description
- The present invention relates to a process for producing molded wooden products and, more specifically, to a process for producing a molded wooden product by placing a fibrous mixture comprising wood fiber, a binder, water-repelling agent, etc., into a compression mold and subjecting it to heat-compression molding.
- Molded wood products, e.g. hardboard, are lighter than plywood and superior in heat resistance, water resistance, and moisture resistance. Furthermore, they are strong relative to their mass and thickness. Because of these favorable properties, molded wooden products are used for such applications as building | interiors, automobile interiors, furniture, and television and stereo cabinets.
- Processes for producing molded wooden products typically involve the following steps. First, wood chips are steamed at 160 to 180°C in the steaming tank of a defibrator (wood splitting machine) until they are soft enough for disintegration. The steamed wood chips are then defibrated by a splitting or defibrating disk. The defibrated wood fiber is dried by hot air, and the dried wood fiber is incorporated with long fibers (e.g., hemp fiber or polypropylene fiber) to improve the deep drawing properties, a binder (e.g., phenolic resin), and a water-repelling agent (e.g., rosin and paraffin). The resulting fibrous mixture is accumulated to form a mat with a predetermined thickness, followed by slight compression with heating. The resulting product is a mat 10 to 40 mm thick, which is easy to store and transport. The mat is cut to a proper size and the trimmed mat is placed in a compression mold for heat compression molding at 180 to 220°C. The molded wooden product is finished by trimming away excess portions.
- The above-mentioned process for producing molded wooden products has the following disadvantages. The wood fiber must be formed into the mat, and the mat must be cut to a predetermined shape. These steps make the production process complex, and result in lowered productivity. The mat must be cut to a size slightly larger than the finished product. This cutting or trimming required before and after molding wastes the material, which leads to poor yields and increased production costs. In addition, if a single mat is to be made into a molded wooden product by deep drawing, expensive hemp fiber (for example as much as 17%) generally must be incorporated into the mat. Where hemp fiber is used, it is necessary to add an extra amount of binder, e.g., synthetic resin. This also leads to increased production costs.
- The molded wooden product as described above is typically finished by forming a hole into which an object is later installed. This requires a special apparatus and adds to the manufacturing steps. This again leads to increased production costs. The hole is usually formed by punching, which makes the periphery of the punched hole weak and gives it a poor appearance, for example, from burrs.
- It is an object of the invention to provide a process for producing molded wooden products having improved properties and improved quality, and into which one or more holes are formed.
- By following the process of the invention, it is possible t omit the mat-construction step and to make the hole or holes in the molded wooden product during the molding process. Thus, an advantage of the present invention is that it simplifies the production steps and improves yield.
- Additional objects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.
- To achieve the objects and in accordance with the purpose of the invention, as embodied and broadly described herein, a process is provided for producing a molded wooden product from a fibrous mixture comprising wood fibers, a binder, a water-repelling agent, and other optional additives,. The fibrous mixture is placed into a compression mold and heat-compression molding is performed. The fibrous mixture may be placed directly in the mold or may be formed into a mass of predetermined shape in such a manner that a first mandrel formed in the mold displaces the mixture, and a hole is thereby formed in the molde wooden product.
- The wood fiber used in this invention is obtained, for example, by defibrating or splitting wood chips. The wood used is not limited to a specific type and may, for example, include Japanese cypress, Japanese red pine, Japanese cedar, Japanese beech, and luaun. In addition, rice staws, flax husks, and bagasse may be used. Similarly, the process of defibration or splitting is not limited to a specific method. For example, splitting may be accomplished by steaming wood chips and mechanically disintegrating them.
- The binder to be added to the wood fiber is not limited to specific type provided it can supplement the interfiber bonding properties inherent in the wood fibers. Examples of the binder include thermoplastic resins such as coumarone resin and thermosetting resins such as phenolic resin and urea resin. A water-repelling agent may also be incorporated with the wood fibers (in addition to the binder) to improve water resistance and promote mold release. An example of a water-repelling agent is paraffin, but any agent which provides enhanced water-repelling properties may be used.
- The fibrous mixture may be introduced into a cavity formed by the upper mold and the lower mold of an opened compression mold by means of an air flow. Alternatively, the mixture may be formed into a mass of predetermined shape prior to placing it in the mold. A hole may be formed in the mass at the position corresponding to a first mandrel incorporated into the mold, and the mass may be placed in the mold such that the first mandrel fits into the hole.
- According to the process of this invention, the mixture placed in the mold is integrally bonded and formed. The molding conditions may be properly established depending on the materials (e.g., wood fiber and binder) used, and the desired shape and strength of the resulting molded wooden product. They are not generally limited to specific values. For example, the molding temperature may range from 100 to 200°C, the molding pressure may range from 20 to 80 kg/cm2, and the molding cycle may range from 20 seconds to 10 minutes.
- According to the process of this invention, the mixture may be placed directly into the mold or it may be formed into a mass of predetermined shape. Therefore, the process of the invention allows the omission of the mat-construction step and consequently simplifies the manufacturing steps. Upon demolding, the molded wooden product has a hole formed in situ by the first mandrel. Thus, the step of forming a hole after molding may be omitted. A fibrous mixture of extremely low density may be used, which improves moldability. The density of the mixture is increased in the vicinity of the first mandrel, which results in high quality products.
- The improved moldability makes it possible to use less binder and reduces the need to add expensive fibers such as hemp fibers, both of which contribute to reducing production costs.
- The accompanying drawings which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
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- Figs. 1 to 8 are schematic representations of an apparatus used to practice the process of this invention for producing molded wooden products.
- Figs. 1 and 2 are sectional views in elevation of a compression mold for heat-compression molding according to the process of the present invention;
- Figs. 3 and 4 are schematic diagrams of a mass forming apparatus for forming the mass to be placed into the mold;
- Figs. 5 and 6 are schematic diagrams of a holding vessel for transporting the mass; and
- Figs. 7 and 8 show apparatus in elevation for feeding the fibrous mixture directly into the compression mold (Fig. 7 is a sectional view of the feeding and molding apparatus, and Fig. 8 is an elevational view of a door used in the mold of Fig. 7.)
- The preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Figs. 1 and 2 show the structure of a compression mold used to practice the process of this invention for producing the molded wooden products. The compression mold comprises an
upper mold 1 and alower mold 2, which are provided with thehot plates lower mold 2 is surrounded by aframe 5 which extends beyond the top o thelower mold 2 so that a cavity is formed on thelower mold 2 to contain the fibrous mass W. Theupper mold 1 can slide along the inner periphery of theframe 5. Thelower mold 2 is provide with afirst mandrel 6. Theupper mold 1 has areceptacle 7 intd which themandrel 6 is inserted. Thefirst mandrel 6 is provided at a location corresponding to the position of the hole in the molded wooden product P (Fig. 2). Themandrel 6 has a diameter approximately equal to that of the hole. - Before the compression-molding step is initiated, the
upper mold 1 andlower mold 2 are preheated byhot plates lower mold 2. The mass W used in this example is one which has an extremely low density. It is produced from a fibrous mixture M comprising wood fiber (e.g., defibrated wood chips), a binder (e.g., phenolic resin) and a water-repelling agent (e.g., paraffin). The fibrous mixture M may be fed to a mass forming apparatus (shown in Figs. 3 and 4 and discussed below) in which a mass W of predetermined shape is formed. The mass W has a hole Wl into which themandrel 6 is inserted. - After the mass W is placed in the mold, the upper ram of the mold (not shown) is forced downward so that the mass W is compressed. As a result of this compression, the wood fibers become more densely interlaced and the molding pressure increases. In the initial stage of compression, the wood fibers are not well interlaced and are highly fluid. Therefore, they can undergo deep drawing without the occurrence of molding defects such as thinning and cracking. When the
upper mold 1 reaches its lower limit and the compression mold is in fully compressed state, a molded wooden product P having a high density and a predetermined thickness (e.g., 2 to 6 mm) is obtained as shown in Fig. 2. Upon demolding, a hole of desired size and shape is formed at the place where thefirst mandrel 6 was positioned. The portion of the mass W which surrounds thefirst mandrel 6 becomes denser than the remaining portions of the mass. Therefore, the periphery of the hole in the molded wooden product P has a correspondingly higher density and is stronger than the other parts of the product. - The mass forming apparatus used to obtain the mass W is shown in Figs. 3 and 4. The
mass forming apparatus 11 is comprised of a spreadingvessel 12 and a collectingvessel 13 positioned beneath the spreading vessel. The spreading vessel is comprised of, for example, iron sheet, and forms a pyramidal or conical roof over the collecting vessel. The collectingvessel 13 is designed to permit the fibrous mixture M to accumulate therein. At the top of the spreadingvessel 12 is anopening 12a. Above theopening 12a is a spreadingunit 14 to spread the fibrous mixture M fed through a pressure feed pipe (not shown). At both sides of theopening 12a areair blowers 15 having air nozzles (not shown) on the inside thereof. The air nozzles control the spreading direction for the mixture in two dimensions. Theair blowers 15 are supplied with air through thair supply lines 19 and theswitch valve 20. - The bottom of the collecting
vessel 13 is connected avacu duct 13a to apply a vacuum to thevessel 13. Afirst preforated member 16 such as wire net or a punched metal plate is provided to shape the bottom surface of the mass W. The collectingvessel 13 is also provided with theheight sensors 17, which are arranged on the wall of the collecting vessel and above the firstperforated member 16. Theheight sensors 17 are used to control the upper profile of the mass as required. Asecond mandrel 18 extends from the bottom of the collecting vessel through theperforated member 16. Thesecond mandrel 18 has an outside diameter equal to or slightly less than that of themandrel 6 attached to thelower mold 2. Thesecond mandrel 18 is positioned at a place corresponding to that of thefirst mandrel 6. - The
mass forming apparatus 11 constructed as described above operates in the following manner to form the mass W. With the switch valve 26 open, air is supplied to theair blowers 15 through theair supply lines 19, so that an air flow is created across the spreadingvessel 12 and the collectingvessel 13. Then, the fibrous mixture M is released from theopening 12a of the spreadingvessel 12 and fed into the air flow. The mixture descends to the collectingvessel 13 and accumulates on the firs perforatedmember 16. The mixture M can be accumulated at desired positions of the perforatedmember 16 by controlling the air flow from theair blowers 15. This control is generally accomplished byswitch valve 20. The accumulation of the mixture M is promoted by applying a vacuum to the bottom of the collectingvessel 13 through thevacuum duct 13a. - The accumulation of the mixture M continues until one of
th height sensors 17 on the wall of the collectingvessel 13 detect the predetermined amount of accumulation. The switch valve 20 i controlled so that the mixture M accumulates at different places until the other height sensors detect a predetermined amount of accumulation. This procedure is repeated until all theheight sensors 17 detect predetermined amounts of accumulation. The supply of the mixture M and the supply of air through theair supply lines 19 are terminated. A mass W with the desired shape is thus obtained. Being a mere accumulation, the mass W has an extremely low density, and it has athickness 20 to 120 times that of the final molded wooden product. - The mass W prepared as described above is then transferred to the mold for heat-compression molding according to the following procedure. The collecting
vessel 13 is disengaged from the spreadingvessel 12. In the example shown in Fig. 5, the holdingvessel 21 is fitted to the collectingvessel 21. The holdingvessel 21 has a second perforated member 22 (also made of wire net or the like) which matches the upper profile of the mass W. The top of the holdingvessel 21 is connected to anexit port 23. When vacuum is applied to the holdingvessel 21 throug theexit port 23 by means of a vacuum pump (not shown), the ligh mass W is lifted upward until it comes into close contact with the secondperforated member 22 in the holdingvessel 21. With vacuum applied, the holdingvessel 21 is lifted. The hole Wl is formed at a place where thesecond mandrel 18 was positioned as shown in Fig. 6. The holdingvessel 21 is brought to a position directly over the compression mold by a transfer means (not shown). At the correct position, the vacuum is terminated, allowing the mass W to fall into thelower mold 2. - In the embodiment described above, the fibrous mixture M is formed into a low-density mass W. In an alternative embodiment of this invention, it is possible to use the mixture M (which is the raw material of the mass W) by directly placing the mixture into the compression mold.
- Fig. 7 shows an embodiment of the apparatus used to feed the mixture M directly into the mold. The
feeding apparatus 30 comprises a feedingcontainer 31 and apressure container 32. The former communicates with the latter through theopening 33 which is opened and closed by a maskingplate 35 actuated bycylinder 34. The feedingcontainer 31 has aninlet 36 at the top for receiving the mixture M. A pair ofrotatable bush wheels 37 are mounted above theopening 33. Thepressure container 32 is connected at one end thereof to an air supply means (not shown) and the other end thereof to the heat-compression mold (as shown in Figs. 1 and 2). A weighingplate 38 connected to a load cell (not shown) is mounted under theopening 33. - The
frame 5 of the mold has two opposingopenings first opening 39 is connected to thepressure container 32, and theother opening 40 is open to the atmosphere. The height of theopenings cavity 41 of the I partially closed mold, and the openings have a width adequate to fit the molded wooden product. In addition, theframe 5 hasside plates openings side plate 42. It has a feeding port 44 which is about the same size as theopening 39. Thewindow 42 of the slidingdoor 43 for thesecond opening 40 is provided with thewire net 45. Each of theside plates rack 46. Amotor 48 is fixedly mounted on abracket 47 projecting from theframe 5. The output shaft of themotor 48 is provided with thepinion 49 which engages with therack 46. In other words, thedoors motor 48, so that theopenings - The mixture M fed into the feeding
container 31 through theinlet 36 is discharged through theopening 33 by the aid of therotating brush wheels 37. The discharged mixture accumulates on the weighingplate 38 in thepressure container 32. When the accumulated mixture reaches a predetermined level or weight, thecylinder 34 is actuated and theopening 33 is closed by the maskingplate 35. At the same time, air is supplied in the direction of the arrow A by the air supply means. The mixture M which has accumulated on the weighingplate 38 is forced into thecavity 41 by the air flow. - The mixture M introduced into the mold cavity is contained by the
wire net 45. Air passes in the direction of arrow B through thewire net 45. Thecavity 41 is thus filled with the mixture M. Then, themotor 48 moves thedoors second openings - It will be apparent to those skilled in the art that various modifications and variations can be made in the process of the present invention without departing from the scope or spirit of the invention. For example, rather than using a single first mandrel to form a single hole in the molded wooden product, a plurality of mandrels may be used to form a corresponding plurality of holes in the product. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
Claims (4)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP275270/85 | 1985-12-07 | ||
JP60275270A JPS62134208A (en) | 1985-12-07 | 1985-12-07 | Manufacture of wooden series molded body |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0226163A2 true EP0226163A2 (en) | 1987-06-24 |
EP0226163A3 EP0226163A3 (en) | 1989-02-22 |
Family
ID=17553085
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP86117081A Withdrawn EP0226163A3 (en) | 1985-12-07 | 1986-12-08 | Process for producing molded wooden products having a hole therein |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0226163A3 (en) |
JP (1) | JPS62134208A (en) |
AU (1) | AU590368B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002069690A3 (en) * | 2001-02-20 | 2002-12-12 | Saint Gobain Isover | Moisture repellent air duct products |
CN115157521A (en) * | 2022-07-19 | 2022-10-11 | 东莞万德电子制品有限公司 | Preparation process of double-side-coated low-temperature silica gel for PC rack and PC rack |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5248949B2 (en) * | 2008-08-08 | 2013-07-31 | オリンパス株式会社 | Wood molding method |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1108998A (en) * | 1964-11-25 | 1968-04-10 | Oystein Winsnes | Arrangement for the production of moulded objects of fibre material, wood chips or sawdust |
DE2534774A1 (en) * | 1975-08-04 | 1977-02-17 | Inselkammer Hans | Press mould for prods. of wood chips and fibres - esp. mouldings with very uneven contours and uniform thickness |
DE2909526A1 (en) * | 1978-03-14 | 1979-09-20 | Joenkoeping Vulcan Vetlanda Ta | PROCESS FOR CREATING HOLES IN BODIES FROM MOLDABLE CHIPPINGS OR DGL. AND DEVICE FOR CARRYING OUT THE PROCEDURE |
US4248820A (en) * | 1978-12-21 | 1981-02-03 | Board Of Control Of Michigan Technological University | Method for molding apertures in molded wood products |
-
1985
- 1985-12-07 JP JP60275270A patent/JPS62134208A/en active Pending
-
1986
- 1986-12-08 EP EP86117081A patent/EP0226163A3/en not_active Withdrawn
- 1986-12-08 AU AU66161/86A patent/AU590368B2/en not_active Ceased
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1108998A (en) * | 1964-11-25 | 1968-04-10 | Oystein Winsnes | Arrangement for the production of moulded objects of fibre material, wood chips or sawdust |
DE2534774A1 (en) * | 1975-08-04 | 1977-02-17 | Inselkammer Hans | Press mould for prods. of wood chips and fibres - esp. mouldings with very uneven contours and uniform thickness |
DE2909526A1 (en) * | 1978-03-14 | 1979-09-20 | Joenkoeping Vulcan Vetlanda Ta | PROCESS FOR CREATING HOLES IN BODIES FROM MOLDABLE CHIPPINGS OR DGL. AND DEVICE FOR CARRYING OUT THE PROCEDURE |
US4248820A (en) * | 1978-12-21 | 1981-02-03 | Board Of Control Of Michigan Technological University | Method for molding apertures in molded wood products |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002069690A3 (en) * | 2001-02-20 | 2002-12-12 | Saint Gobain Isover | Moisture repellent air duct products |
CN115157521A (en) * | 2022-07-19 | 2022-10-11 | 东莞万德电子制品有限公司 | Preparation process of double-side-coated low-temperature silica gel for PC rack and PC rack |
CN115157521B (en) * | 2022-07-19 | 2023-10-24 | 东莞万德电子制品有限公司 | Preparation process of double-sided low-temperature silica gel bag of PC frame and PC frame |
Also Published As
Publication number | Publication date |
---|---|
EP0226163A3 (en) | 1989-02-22 |
AU6616186A (en) | 1987-06-11 |
AU590368B2 (en) | 1989-11-02 |
JPS62134208A (en) | 1987-06-17 |
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