JP5656198B2 - Curl forming apparatus for plastic composite wood sheet, curl forming method for plastic composite wood sheet, and plastic composite wood sheet with curled portion - Google Patents

Description

The present invention is a plastic curl forming method of the curl forming apparatus and plastic composite wood sheet of composite wood sheet relates plastic composite wood sheet which is processed by it, particularly, plastic composite wood impregnated with thermoplastic resin in wood Material (wood plastic Combination) plate-shaped plastic curl forming method of the curl forming apparatus and plastic composite wood sheet of composite wood sheet suitable for bending a thin plate made of, relating to thereby machined the workpiece.

  Some automobile handles, portable terminal cases, and the like are made of wood on a part of them to improve design and give a sense of luxury. When wood is applied to a part of an instrument panel or handle, processing of a complicated three-dimensional shape is required to correspond to the shape, and in the past, by cutting out solid wood by craftsmen It was made.

  However, in the processing method of cutting out from solid wood, there is a problem that costs are increased due to loss of material accompanying cutting out or high technology by craftsmen.

  Therefore, in recent years, a method of bending a three-dimensional structure of wood by bending instead of cutting is becoming widespread. As a technique related to such technology, for example, Patent Document 1 discloses a resin. Applying and / or impregnating the wood with a hardening solution at the same time as or after the bending process is performed on the impregnated thin plate-like wood of about 0.1 to 1 mm by hot pressing. Discloses a method for producing a wood molded body by curing. Patent Document 2 discloses that a wood impregnated with a synthetic resin is curved and punched with a mold, and the curved surface and punching are performed at the same time as the synthetic resin impregnated in the wood is temporarily softened and then cured. Techniques for making them disclosed are disclosed.

JP 2008-44353 A JP-A-10-113906

  Patent Document 1 is a technique in which a wood impregnated with resin is simply heated in a heated state and bent into a desired shape, and the end of the resin-impregnated member is slightly bent by pressing, Although it seems that it is possible to form an arc shape in a gentle arc shape, it must be said that it is practically difficult to form it into a tight arc shape or a complicated three-dimensional shape. In addition, when the bent wood is fixed (cured), it is necessary to supply a hardening solution to the wood, which requires complicated work.

  Patent Document 2 describes that a composite material as wood impregnated with a synthetic resin is formed into a substantially cylindrical shape by sandwiching it with a mold, but is formed when the radius of the arc is large. Although it may be possible, when the radius is small, it is conceivable that the composite material is damaged when sandwiched between the molds.

The present invention has been made in view of the above problems, and a plastic composite wood sheet curl forming apparatus and a plastic composite wood sheet curl forming device that can bend a plastic composite wood sheet without breaking in a short time. The object is to provide a method and a plastic composite wood sheet with curl.

The invention of the curl forming apparatus for a plastic composite wood sheet according to claim 1,
A molding apparatus for bending a plastic composite wood sheet , wherein the molding die of the molding apparatus is provided with a curved continuous through-hole, and the molded mold is molded into a curved through-hole while heating. should by pushing the plastic composite timber sheet continuously, the plastic composite timber thin plate is inserted to curving along the curve of the curved through-hole, said forming an outer surface of the plastic composite timber sheet to be molded By pressing the metal mold while abutting against the inner surface of the curved through-hole of the mold, a pressing resistance is generated in a direction opposite to the advancing direction of the plastic composite wood sheet, and when the plastic composite wood sheet is bent by the pressing resistance, While suppressing the generated tensile stress, the plastic composite wood sheet is curved and molded according to the shape of the curved through hole of the molding die. A curl forming apparatus Unishi was plastic composite wood sheet,
The molding die of the molding apparatus is in communication with a heat softening block in which a linear through hole into which a thin plastic composite wood thin plate is inserted and a linear through hole formed in the heat softening block. A heat-molded block in which the curved through-hole is formed, and a cooling and fixing block in which a through-hole communicating with the curved through-hole is formed,
By pressing the plastic composite wood sheet by means of a conveying device, the plastic composite wood sheet is inserted through the linear through-hole formed in the heat softening block, and the thermoplastic resin impregnated in the plastic composite wood sheet is heated above the softening point,
The plastic composite wood sheet impregnated with the thermoplastic resin having the softening point or higher is guided to the curved through-hole formed in the thermoformed block, and the curved shape of the through-hole formed in the thermoformed block is obtained. Heat-molded so that
When the heat-molded plastic composite wood sheet is led from the curved through-hole of the heat-molded block to the through-hole of the cooling and fixing block, the plastic composite wood sheet is cooled,
The cooled plastic composite wood sheet, by sliding movement in the width direction of the plastic composite wood sheet, wherein the plastic composite timber sheet molded from the molding die is characterized Rukoto retrieved.

Invention of the curl forming apparatus of the plastic composite timber sheet according to claim 2, in claim 1,
The conveyance device is characterized in that one end of the plastic composite wood thin plate is pressed to convey the plastic composite wood thin plate at a constant speed.

The invention of the curl forming method of the plastic composite wood sheet according to claim 3 ,
Molding die for curving the plastic composite timber sheet is provided with a through hole continuous curved, plastic wood composite sheet to be molded into a curved through-hole while heating the molded metal mold continuously by pushing, a curling method of forming plastic composite timber sheet to curving along the plastic composite timber thin plates are inserted into the curve of the curved through-hole,
The molding die includes a heat softening block in which a straight through hole through which a thin plastic composite wood thin plate is inserted, and the curved shape in communication with the straight through hole formed in the heat softening block. A heat-molded block in which a through-hole is formed, and a cooling and fixing block in which a through-hole communicating with the curved through-hole is formed,
When bending the plastic composite wood sheet, when the plastic composite wood sheet is conveyed from the through hole of the heat softening block to the through hole of the heat forming block and to the through hole of the cooling and fixing block,
In a state where the heater provided in the molding die is turned on and heated to a predetermined temperature, the plastic composite wood thin plate is pressed by a conveying device, and the plastic composite wood thin plate is inserted from the insertion hole of the heating softening block, A heating and softening step of heating the thermoplastic resin impregnated in the plastic composite wood sheet to a softening point or higher;
A plastic composite wood sheet impregnated with a thermoplastic resin having a softening point or higher by the heat softening step is conveyed to the curved through-hole of the heating molding block, and the plastic composite wood sheet heated by the heater is provided. A heating molding step of thermoforming the plastic composite wood sheet along the curve of the curved through hole of the heating molding block as it is being conveyed,
With the plastic composite timber sheet guided to the through hole of the cooling and fixing block, the heater is switched from on to off and cooled by the cooling means of the cooling and fixing block, so that the heat A cooling and fixing step in which the plastic composite wood sheet impregnated with the plastic resin is fixed by being cooled;
The plastic composite timber sheet which is cooled by the cooling fixing step, by sliding movement in the width direction of the plastic composite wood sheet, a step of taking out the plastic composite timber sheet from the molding die, the Rukoto includes a Features.

Invention of the curl forming method for a plastic composite timber sheet according to claim 4, in claim 3,
Pushing the outer surface of the plastic composite wood sheet to be molded into contact with the inner surface of the curved through hole of the heating mold block of the molding die, thereby pushing in the direction opposite to the direction of travel of the plastic composite wood sheet And curving the plastic composite wood sheet corresponding to the shape of the curved through-hole of the heat-molded block, while suppressing the tensile stress generated during the bending of the plastic composite wood sheet by the indentation resistance. Features.

The invention of the plastic composite wood thin plate provided with the curled portion according to claim 5 ,
The plastic composite wood sheet according to claim 1 or 2 is bent and formed by the curl forming apparatus.

According to the present invention, when the plastic composite wood thin plate is inserted through the through hole of the heat softening block at a constant speed, the outer surface of the plastic composite wood thin plate advances while contacting the inner surface of the through hole of the heat softening block. Thus, indentation resistance is generated in the direction opposite to the traveling direction of the plastic composite wood sheet . When the plastic composite wood sheet is guided to the through hole of the heat-molded block formed in a curved shape in the state where the indentation resistance is generated, the heat stress is suppressed while the tensile stress on the plastic composite wood sheet is suppressed by the indentation resistance. The plastic composite wood sheet is bent according to the shape of the curved through-holes in the block. Therefore, the plastic composite wood thin plate can be bent without being damaged by the action of the pushing resistance.

In addition, after the plastic composite wood sheet is bent by being guided to the heat-molded block as a heat molding process, the plastic composite wood sheet is cooled by a cooling means such as a blower provided in the cooling and fixing block. The plastic composite wood sheet can be quickly fixed by being cooled by the means. Moreover, conventionally, when bending wood, the wood has been softened by sufficient heat treatment with steam or hot water and then bent into a desired shape. In this case, since water permeates into the wood, it has been necessary to spend a lot of time on the work such as drying. However, in the present invention, such a complicated drying work can be eliminated, and the plastic that has been bent in a short time. It becomes possible to obtain a composite wood sheet .

Also, plastic wood composite sheet impregnated with a thermoplastic resin to be inserted into the through hole of the heat softening block, rather than being softened by being heated by an external mosquito Lumpur molding apparatus, the through hole of the heat softening block The wood itself is softened and softened by being heated until the thermoplastic resin reaches the softening point or higher. Therefore, if when the through hole of the heat softening blocks attempts to insert a plastic composite timber sheet in a softened state, while the inserting operation by the softening of the plastic composite timber sheet becomes difficult, in the present invention, solidified plastic composite Since the wood thin plate is inserted into the through hole of the heat softening block, such a problem can be solved.

Further, in the present invention, the softened plastic composite wood sheet is not supplied to the heating softening block, but is gradually heated to a high temperature after the solidified plastic composite wood sheet is inserted into the through hole of the heating softening block. Unlike the case where the softened wood is supplied to the heat softening block, the indentation resistance when the plastic composite wood sheet is guided is relatively low in the heat molding process. It becomes possible to enlarge. Thus, a relatively large push-in resistance, tensile stress to the plastic composite timber sheet can be effectively suppressed can be bent while suppressing the breakage of the plastic composite timber sheet effectively.

It is a schematic block diagram which shows the curl shaping | molding apparatus of the plastic composite wood thin plate of an example of this invention. It is a perspective view of a plastic composite timber sheet having a curl portion showing a state of fixing the plastic composite timber sheet. It is explanatory drawing which shows an example of the bending process of the plastic composite wood thin plate used as a reference in understanding this invention. 3mm the thickness of the species as a Juglans, 10 mm radius of curvature, the conveying speed 100 mm / min, the plastic composite timber sheet when the heating temperature of the heater of the heat-softened block and heated molding block and 210 ° C. bending It is explanatory drawing which shows the experimental result. 3mm the thickness of the species as a Juglans, 10 mm radius of curvature, the conveying speed 50 mm / min, the plastic composite timber sheet when the heating temperature of the heater of the heat-softened block and heated molding block and 210 ° C. bending It is explanatory drawing which shows the experimental result. 1.5mm The thickness of the species as a Juglans, 3 mm radius of curvature, the plastic composite timber sheet when the conveying speed was 100 mm / min, a heating temperature of the heater of the heat-softened block and heated molding block and 210 ° C. It is explanatory drawing which shows the experimental result of a bending process. 1.5mm The thickness of the species as a Juglans, 3 mm radius of curvature, the plastic composite timber sheet when the conveying speed was 50 mm / min, a heating temperature of the heater of the heat-softened block and heated molding block and 210 ° C. It is explanatory drawing which shows the experimental result of a bending process. 1.5mm The thickness of the species as a Juglans, 3 mm radius of curvature, the plastic composite timber sheet when the conveying speed was 30 mm / min, a heating temperature of the heater of the heat-softened block and heated molding block and 210 ° C. It is explanatory drawing which shows the experimental result of a bending process.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. Of course, it goes without saying that the present invention can be easily applied to configurations other than those described in the embodiments without departing from the spirit of the invention.

An example mosquitoes Lumpur forming apparatus 1 of the present invention has bending a plastic composite timber sheet, specifically, a relatively thick thin thermoplastic resins such as an acrylic resin-impregnated (for example, 1 mm to 3 mm) is an apparatus for bending a straight wood, that is, a plastic composite wood thin plate 2 into an arc shape or the like.

As shown in FIG. 1, the mosquito Lumpur forming apparatus 1, as the molding die, the heat-softened block 3 the thermoplastic resin is softened by heating the plastic composite timber sheet 2 which is solidified impregnated, heat-softened A heat-molded block 4 for bending the plastic composite wood sheet 2 softened in the block 3 while heating, and a cooling and fixing block 5 for cooling and fixing the plastic composite wood sheet 2 are provided so as to be adjacent to the left and right. The provided heat softening block 3 and the cooling immobilization block 5 are disposed so as to be placed on the heat molding block 4, and these three blocks 3, 4, and 5 are integrally connected. .

Further, the heat softening block 3 and the cooling fixed block 5 are formed with straight through holes 3 a and 5 a in the vertical direction, and the through hole 3 a of the heat softening block 3 and the through hole of the cooling fixed block 5 are formed. 5a is communicated by an arcuate (curved) through-hole 4a formed in the heat-molded block 4. The heating softens block 3, heat molding block 4, and the through hole 3a of the cooling fixed block 5, 4a, 5 a cross-sectional shape, it becomes the same shape and the same size, also, a heat-softened block 3 heating Each of the molding blocks 4 is provided with a heater 6.

Above the heat softening block 3, one end of the plastic composite wood thin plate 2 inserted into the through hole 3a of the heat softening block 3 is pressed, and the plastic composite wood thin plate 2 is attached to the through hole 3a of the heat softening block 3, A transport device 7 for transporting at a constant speed in the order of the through hole 4a of the thermoforming block 4 and the through hole 5a of the cooling and fixing block 5 is provided. Cooling means are provided.

Then, the mosquitoes Lumpur forming apparatus 1, the operation for bending a plastic composite timber sheet 2 the thermoplastic resin is solidified is impregnated will be described. First, the plastic composite wood which is thinly solidified in a state where the heater 6 provided in the heat softening block 3 and the heat molding block 4 is turned on and heated to a predetermined temperature (210 ° C. in this embodiment). The front end (one end) of the thin plate 2 is inserted from the opening 8 of the heat softening block 3, the rear end (the other end) of the plastic composite wood thin plate 2 is pressed by the conveying device 7, and the plastic composite wood thin plate 2 is moved at a constant speed. when slide into transport (the state shown in FIG. 1), when a plastic composite timber sheet 2 is positioned in the through hole 3a of the heat softening block 3, while the plastic composite timber sheet 2 is conveyed, impregnated with plastic wood composite sheet 2 The made thermoplastic resin is heated above the softening point (heating softening step).

Subsequently, when the plastic composite wood thin plate 2 impregnated with the thermoplastic resin having a softening point or higher is conveyed to the through hole 4a of the thermoforming block 4, it is heated by the heater 6 of the thermoforming block 4. As the plastic composite wood sheet 2 is conveyed, it is sequentially bent into a shape corresponding to the shape of the arc-shaped through hole 4a of the heat-molded block 4 (heat-molding step).

When a substantially U-shaped one as shown in FIG. 2 is formed, the cooling immobilization block 5 in a state in which the distal end side of the plastic composite wood thin plate 2 is led to the through hole 5a of the cooling immobilization block 5 is formed. And the heating softening block 3 and the heating heater 6 of the thermoforming block 4 are switched from on to off, so that the entire plastic composite wood thin plate 2 as a wood impregnated with thermoplastic resin is obtained. It is cooled and fixed (cooling and fixing step).

After the cooling and fixing step, the three blocks including the heat softening block 3, the heat molding block 4, and the cooling and fixing block 5 or the plastic composite wood thin plate 2 are placed on the near side of FIG. by sliding movement in the width direction of the plastic composite timber sheet 2, from mosquito Lumpur forming apparatus 1, the plastic composite timber sheet 2 fixed of the substantially U-shaped as shown in FIG. 2 is taken out.

Here, the bending process of the plastic composite wood sheet 2 will be described with reference to FIG. FIG. 3A schematically shows the stress distribution in the mountain fold and the valley fold when the plastic composite wood thin plate 2 which is a linear wood impregnated with a thermoplastic resin is simply bent. b) is a mountain fold when bent in a state where a U-shaped steel strip is attached to both sides and both ends of the plastic composite wood thin plate 2 which is a straight wood impregnated with thermoplastic resin. It is a schematic representation of the stress distribution at the valley fold.

As shown in FIG. 3 (a), when the plastic composite wood thin plate 2 is bent without attaching an iron band, the tensile stress in the mountain fold and the compressive stress in the valley fold are generated almost equally. as shown in 3 (b), a mountain fold side and both ends of the plastic composite timber sheet 2 held in the iron band, when bending the plastic composite timber sheet 2 with iron bands (so-called toe net method), mountain fold side The tensile stress of becomes smaller, and the compressive stress on the valley fold side becomes larger. Then, plastic wood composite sheet 2 is greater than the value of the numerical value of the compressive stress tensile stress are known that difficult to be destroyed are also a thermoplastic resin impregnated in plastic composite wood sheet 2 in the softening point or plastic wood composite sheet 2 heated until the strain amount of the plastic composite wood sheet 2 is about 1% at a tensile, plastic wood composites sheet 2 when it reaches about 5% compression fracture It is known to do. Therefore, in the present invention, the plastic composite wood thin plate 2 is held in close contact with the inner wall surfaces of the through holes 3a, 4a, and 5a, and the other end of the plastic composite wood thin plate 2 is pressed by the conveying device 7 so that the plastic By giving the composite wood thin plate 2 an indentation resistance accompanying conveyance, the plastic composite wood thin plate 2 is prevented from being broken when it is bent.

Here, in mosquito Lumpur forming apparatus 1 will be described with reference to FIGS. 4-8 experimental results when bending the plastic composite timber sheet 2 under various conditions.

In FIG. 4, the species of wood plastic composite lumber sheet 2 and Juglans, plastic composite 3mm thickness T of the timber sheet 2, the plastic composite 10mm radius of curvature of the timber sheet 2, the conveying speed 100 mm / min, When the heating temperature of the heat softening block 3 and the heat molding block 4 is set to 210 ° C. with the heater 6, the width W of the through holes 3a, 4a, 5a is 3 mm (clearance: 0 mm), 3.1 mm (clearance: 0.1 mm), or, 3.2 mm (clearance: under the condition of 0.2 mm), an experimental result when performing bending in mosquito Lumpur forming apparatus 1, the vertical axis, the value of indentation resistance represents "pushing force (kgf)", a state of the molding after bending plastic composite lumber sheet 2 as "evaluation", the horizontal axis, the through-holes 3a, 4a, the difference between the width W and thickness T of the plastic composite timber sheet 2 of a the (W-T) is represented as "clearance (mm)". In FIG. 5, the conditions are the same as those in FIG. 4 except that the conveyance speed is set to 50 mm / min.

Further, in FIG. 6, the species of wood plastic composite lumber sheet 2 and Juglans, 1.5 mm thickness T of the plastic composite timber sheet 2, the curvature radius of 3mm of the plastic composite wood sheet 2, the conveying speed When the heating temperature of the heating softening block 3 and the heating molding block 4 is 210 ° C. with the heater 6 at 100 mm / min, the width dimension W of the through holes 3a, 4a, 5a is 1.5 mm (clearance: 0 mm), 1.6 mm (clearance: 0.1 mm), or, 1.7 mm: under the condition of (clearance 0.2 mm), an experimental result when performing bending in mosquito Lumpur forming apparatus 1, the vertical axis represents the value of indentation resistance "pushing force (kgf)", a state of the molding after bending plastic composite lumber sheet 2 as "evaluation", the horizontal axis, the through-hole a, represents 4a, the difference between the width W and thickness T of the plastic composite timber sheet 2 of 5a and (W-T) as a "clearance (mm)". In FIG. 7, the conditions are the same as those in FIG. 6 except that the conveyance speed is 50 mm / min. In FIG. 8, except for the points where the conveyance speed is 30 mm / min, FIG. The conditions are the same as

In the “evaluation” in FIGS. 4 to 8, as shown in these figures, “0” is “complete crack”, “1” is “uncorrectable crack (big crack)”, “ “2” represents “correctable cracks (slight cracks)”, and “3” represents “no cracks”. As is apparent from the results of “evaluation”, there is a difference in the molding state due to the difference in conveying speed. Although it occurs, it has been found that the most excellent molded state after bending the plastic composite wood sheet 2 is most preferably a clearance of “0”. That is, when the clearance is set to “0” (the thickness T of the plastic composite wood thin plate 2 = the width dimension W of the through-hole) and the numerical value of the indentation resistance is increased, the tensile stress generated during the bending molding of the plastic composite wood thin plate 2 The present inventors have found that cracks and cracks that may occur when the plastic composite wood sheet 2 is bent are avoided. And further, based on the results of this experiment, in order to further increase the indentation resistance, for example, the thickness T of the plastic composite wood sheet 2 is made slightly larger than the width dimension W of the through holes 3a, 4a, 5a. As a result, it was possible to derive the result (thickness T of the plastic composite wood thin plate 2 > width dimension W of the through hole).

As described above, according to the mosquito Lumpur forming apparatus 1 of the present embodiment, heat-softened block linear through hole 3a of a plate-like plastic composite wood sheet 2 impregnated with the thermoplastic resin is inserted is formed 3, a thermoformed block 4 in which a curved through hole 4 a communicating with the linear through hole 3 a formed in the heat softening block 3 is formed, and a linear through hole 3 a formed in the heat softening block 3. the plastic composite wood sheet 2 inserted through pressing, move the inserted linearly through-hole 3a of the heat softening block 3 the plastic composite timber sheet 2 into curved through-hole 4a of the heating mold block 4 at a constant speed and a transfer device 7 for, when the plastic composite timber sheet 2 is inserted into the through hole 3a of the heat softening block 3, the heat-friendly impregnated into the plastic composite timber sheet 2 Heating the sexual resin softening point or higher, the plastic composite timber sheet 2 the thermoplastic resin becomes more softening point is impregnated, is guided to the through hole 4a of the heating mold block 4, so that a predetermined curved shape It is to be thermoformed. Then, the plastic composite wood thin plate 2 is inserted through the through hole 3a of the heat softening block 3 at a constant speed, and the outer surface of the plastic composite wood thin plate 2 passes through the through hole of the heat softening block 3 (and the through hole 4a of the heat molding block 4). Then, by advancing while abutting against the inner surface of the through hole 5a) of the cooling and fixing block 5, a pushing resistance is generated in the direction opposite to the advancing direction of the plastic composite wood sheet 2, and a curve is generated in the state where the pushing resistance is generated. The plastic composite timber sheet 2 is guided to the through-hole 4a of the heat-molded block 4 formed in a shape, thereby suppressing the tensile stress on the plastic composite timber sheet 2 due to the indentation resistance and the curve of the heat-formed block 4 The plastic composite wood thin plate 2 can be bent in accordance with the shape of the through hole 4a. Therefore, the plastic composite wood thin plate 2 can be effectively bent without being damaged by the action of the push-in resistance.

Further, as a heating molding process, after the plastic composite timber sheet 2 impregnated with a thermoplastic resin such as an acrylic resin it is bent by being guided to the heated molded block 4 to the wood, as the cooling fixing step, the plastic composite timber By cooling the thin plate 2 by a cooling means such as a blowing means provided in the cooling and fixing block 5, the plastic composite wood thin plate 2 can be quickly fixed. Moreover, conventionally, when performing bending of a wood material, from the soft wood by sufficiently heating by steam or hot water, it had been bent into a desired shape, in such a case, Since moisture penetrates into the wood, much time must be spent on operations such as drying.In contrast, the present invention can eliminate such troublesome drying operations and can be fixed in a short time. It is possible to obtain a plastic composite wood sheet 2 made into a plastic .

Furthermore, plastic wood composite sheet 2 impregnated with a thermoplastic resin to be inserted into the through hole 3a of the heat softening block 3, rather than being softened by being heated by an external mosquito Lumpur forming apparatus 1, heat-softened By being led to the through hole 3a of the block 3, the wood itself is softened and softened by being heated until the thermoplastic resin reaches the softening point or higher. Therefore, if when the through hole 3a of the heat softening block 3 attempts to insert a plastic composite timber sheet 2 in a softened state, while the inserting operation by the softening of the plastic composite timber sheet 2 to the heat softening block 3 becomes difficult, In the present invention, since the solidified plastic composite wood sheet 2 is inserted from the opening 8 of the heat softening block 2, such a problem can be solved.

Furthermore, in the present invention, the softened plastic composite wood thin plate 2 is not inserted through the opening 8 of the heat softening block 3, but the solidified plastic composite wood thin plate 2 is inserted into the through hole of the heat softening block 3. since Yuku is gradually softened by being heated to a high temperature from being, different from the case where the timber in a softened state is inserted from the opening 8 of the heat softening block 3, in the heating molding process, plastic composite It becomes possible to relatively increase the pushing resistance when the wood thin plate 2 is guided. Therefore, the tensile stress with respect to the plastic composite wood sheet 2 can be effectively suppressed by the relatively large indentation resistance, and the bending of the plastic composite wood sheet 2 can be effectively suppressed and easily bent.

As mentioned above, although an example of this embodiment was explained in full detail, this invention is not limited to embodiment mentioned above, A various deformation | transformation implementation is possible within the range of the summary of this invention. For example, in the plastic composite wood thin plate 2, the thermoplastic resin impregnated in the wood may be impregnated with a resin raw material such as methyl methacrylate or styrene in a monomer state. Further, the thermoplastic resin is not limited to an acrylic resin, but may be other than that, and may be appropriately selected. Further, the present invention is not limited to wood impregnated with a thermoplastic resin, and can also be applied to wood not impregnated with a thermoplastic resin.

1 month Lumpur molding device 2 plastic composite timber sheet 3 heat-softened block 3a softened block the through-hole 4 heated molding block 4a heating molding block of the through-hole 5 the cooling fixed block 5a cooled fixed block through holes 7 conveying device

Claims (5)

A molding apparatus for bending a plastic composite wood sheet , wherein the molding die of the molding apparatus is provided with a curved continuous through-hole, and the molded mold is molded into a curved through-hole while heating. should by pushing the plastic composite timber sheet continuously, the plastic composite timber thin plate is inserted to curving along the curve of the curved through-hole, said forming an outer surface of the plastic composite timber sheet to be molded By pressing the metal mold while abutting against the inner surface of the curved through-hole of the mold, a pressing resistance is generated in a direction opposite to the advancing direction of the plastic composite wood sheet, and when the plastic composite wood sheet is bent by the pressing resistance, While suppressing the generated tensile stress, the plastic composite wood sheet is curved and molded according to the shape of the curved through hole of the molding die. A curl forming apparatus Unishi was plastic composite wood sheet,
The molding die of the molding apparatus is in communication with a heat softening block in which a linear through hole into which a thin plastic composite wood thin plate is inserted and a linear through hole formed in the heat softening block. A heat-molded block in which the curved through-hole is formed, and a cooling and fixing block in which a through-hole communicating with the curved through-hole is formed,
By pressing the plastic composite wood sheet by means of a conveying device, the plastic composite wood sheet is inserted through the linear through-hole formed in the heat softening block, and the thermoplastic resin impregnated in the plastic composite wood sheet is heated above the softening point,
The plastic composite wood sheet impregnated with the thermoplastic resin having the softening point or higher is guided to the curved through-hole formed in the thermoformed block, and the curved shape of the through-hole formed in the thermoformed block is obtained. Heat-molded so that
When the heat-molded plastic composite wood sheet is led from the curved through-hole of the heat-molded block to the through-hole of the cooling and fixing block, the plastic composite wood sheet is cooled,
The cooled plastic composite wood sheet, by sliding movement in the width direction of the plastic composite wood sheet, plastic wood composite sheet where the plastic composite timber sheet molded from the molding die is characterized Rukoto retrieved Curl forming equipment. The conveying device, the curl forming apparatus of the plastic composite timber sheet according to claim 1, characterized in that to press the end of the plastic composite timber sheet is to convey the plastic composite timber sheet at a constant speed. Molding die for curving the plastic composite timber sheet is provided with a through hole continuous curved, plastic wood composite sheet to be molded into a curved through-hole while heating the molded metal mold continuously by pushing, a curling method of forming plastic composite timber sheet to curving along the plastic composite timber thin plates are inserted into the curve of the curved through-hole,
The molding die includes a heat softening block in which a straight through hole through which a thin plastic composite wood thin plate is inserted, and the curved shape in communication with the straight through hole formed in the heat softening block. A heat-molded block in which a through-hole is formed, and a cooling and fixing block in which a through-hole communicating with the curved through-hole is formed,
When bending the plastic composite wood sheet, when the plastic composite wood sheet is conveyed from the through hole of the heat softening block to the through hole of the heat forming block and to the through hole of the cooling and fixing block,
In a state where the heater provided in the molding die is turned on and heated to a predetermined temperature, the plastic composite wood thin plate is pressed by a conveying device, and the plastic composite wood thin plate is inserted from the insertion hole of the heating softening block, A heating and softening step of heating the thermoplastic resin impregnated in the plastic composite wood sheet to a softening point or higher;
A plastic composite wood sheet impregnated with a thermoplastic resin having a softening point or higher by the heat softening step is conveyed to the curved through hole of the heat-molded block, and the plastic composite wood sheet heated by the heater is provided. A heating molding step of thermoforming the plastic composite wood sheet along the curve of the curved through hole of the heating molding block as it is being conveyed,
With the plastic composite timber sheet guided to the through hole of the cooling and fixing block, the heater is switched from on to off and cooled by the cooling means of the cooling and fixing block, so that the heat A cooling and fixing step in which the plastic composite wood sheet impregnated with the plastic resin is fixed by being cooled;
The plastic composite timber sheet which is cooled by the cooling fixing step, by sliding movement in the width direction of the plastic composite wood sheet, a step of taking out the plastic composite timber sheet from the molding die, the Rukoto includes a A method for curling plastic composite wood sheet . Pushing the outer surface of the plastic composite wood sheet to be molded into contact with the inner surface of the curved through hole of the heating mold block of the molding die, thereby pushing in the direction opposite to the direction of travel of the plastic composite wood sheet And curving the plastic composite wood sheet corresponding to the shape of the curved through-hole of the heat-molded block, while suppressing the tensile stress generated during the bending of the plastic composite wood sheet by the indentation resistance. The method for curling a plastic composite wood sheet according to claim 3 . A plastic composite wood thin plate provided with a curled portion, which is bent by the curl forming apparatus for plastic composite wood thin plate according to claim 1 or 2 .

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