JP2009234174A - Manufacturing method of longitudinal molded article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method capable of solving a shrinkage problem due to temperature of a longitudinal molded article. <P>SOLUTION: In the manufacturing method of a longitudinal molded article having a prescribed length comprising processes of extruding resin, cooling the molded resin and cutting the cooled resin into a prescribed size, the longitudinal molded article is manufactured by applying a predetermined temperature to the longitudinal molded article after the cooling, that is, performing the annealing of the longitudinal molded article, wherein the resin is extruded tubularly, is molded as a tube, the annealing is performed after cutting the longitudinal molded article, the annealing is performed by heating the longitudinal molded article at about 60°C or more for about one hour or more and the annealing is performed by projecting the longitudinal molded article in a furnace and, thereby, heating the same. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a method for producing a longitudinal molded article made of an elastic material, for example, a method for producing a longitudinal molded article that prevents shrinkage of a longitudinal molded article that circulates ink used in a printer device. It is about.

2. Description of the Related Art Conventionally, there is a tube through which ink is circulated as one form of a longitudinal molded product made of a flexible resin. In the printer device, it is used as part of an ink distribution path for distributing ink from the ink tank to the recording head. In particular, in the recording head, in order to perform an operation in the left-right direction with respect to the recording paper, an ink distribution tube having flexibility to follow the operation is required.

For example, as shown in FIG. 7, in a conventional light format printer (LFP) device 70,
Tubes 73, 73 extending from the first and second cartridges 71, 72 side to the branching portion 74;
The curved tube 76 extends from the branching portion 74 to the head holding carriage 75 side. In this case, the tubes 73 and 73 are formed with a margin in length. However, in the case of the bending tube 76, the length of the bending tube 76 is necessary and sufficient for accurate operation of the carriage 75. Has only length. Further, in order to suppress the variation of the tube in the bending tube 76, an elastic plate, for example, a belt-shaped stainless plate having a predetermined length is clamped and integrated along the bending tube 76.

Polypropylene (PP), polyethylene (PE), olefin-based plastic elastomer (TPE), styrene-based TPE, polyamide-based TPE, or urethane-based TPE are mixed in such a tube, and an extrusion mold is used. Is extruded and molded as shown in FIG.
As shown in FIG. 8B, a tube integrally molded with the holes 91 to 94 arranged side by side as shown in the sectional shape shown in FIG.
As shown in FIG. 2, it is generally used by being modified so as to form a J or U shape (see, for example, Patent Document 1). The curved tube 76 has an inner surface side A and an outer surface side B when viewed from its deformation.
Divided into
Japanese Patent Laid-Open No. 10-288575

However, in a tube molded by a conventional manufacturing method, the curved tube 76 may shrink by about 2% with respect to 4 m of the tube usage length, for example, due to a temperature change in the usage environment of the LFP device 70. The pulling force due to the shrinkage acts in a direction to shrink the curved tube 76 and the stainless steel plate clamped, so that the stainless steel plate is shifted and a creaking sound is generated between the stainless steel plate and the curved tube 76. , Had the disadvantage of impairing the merchantability. Further, when the bending of the curved tube 76 is further increased, a large pulling force is applied to make the carriage itself hang, and it is not easy to position the head at a specified position. . One of the reasons why the tube shrinks is
It is conceivable to perform extrusion molding while pulling out a tube with a take-up machine at the time of extrusion molding. Tension is generated due to the difference between the feeding speed of the extrusion molding and the take-up speed by the take-up machine. It is considered that this tension becomes residual stress in the tube manufacturing process and is inherent in the tube, and shrinkage occurs in the process of restoring the tube against the stress.

Therefore, the present invention aims to solve the above-mentioned problems, and in a method for producing a longitudinal molded product having a predetermined length after extruding a resin, cooling, and then cutting to a predetermined dimension, after cooling the longitudinal molded product A longitudinal molded product is produced by annealing at a predetermined temperature. Thereby, the contraction in the longitudinal direction due to the temperature change of the longitudinal molded product is saturated in a short time, and a longitudinal molded product having no contraction change in the longitudinal direction when used as a product can be obtained.

According to another invention, the resin is extruded into a tubular shape and formed as a tube.
As a result, for example, by attaching as a tube that circulates ink from the ink tank of the recording apparatus to the recording head, the recording head can stably hold the head position at the specified position without being affected by the shrinkage change of the ink tube, and accurately. Operation can be performed and ink can be ejected and adhered with high accuracy, and a high-quality recording apparatus can be obtained.

According to another invention, the annealing is performed after the longitudinal shaped product is cut. This
A desired predetermined length, for example, a dimension in which a longitudinal molded product can be immediately used as a product, or
It is possible to manufacture a longitudinal molded product that does not shrink due to a temperature change, with a predetermined length of the longitudinal molded product as a lot unit.

According to another invention, the annealing is performed by performing a heat treatment at about 60 ° C. or more for about 1 hour or more. Thereby, even when the material of the longitudinal molded product to be manufactured or the cross-sectional shape perpendicular to the longitudinal direction is changed, it is possible to stably manufacture the longitudinal molded product without shrinkage due to temperature change.

According to another invention, the annealing is heated by being put in a furnace. This
After the longitudinal molded product formed by extrusion molding is cut to a predetermined length, the entire predetermined length is completely put into the furnace and annealed. Therefore, complete homogeneous annealing can be performed on a longitudinal molded product having a predetermined length. According to the present invention, even if an annealed longitudinal molded product having a predetermined length is cut to a shorter length depending on the use situation, the cut molded product has the same properties in any part. .

In addition, according to another invention, after cutting the longitudinal molded product to a predetermined length, it is in a state of a scroll,
Annealing is performed in the state of this roll. Thereby, a longitudinal molded product having a curvature in the longitudinal direction and free from expansion and contraction due to a temperature change can be manufactured. For example, improvement in production efficiency can be expected if it is selected so as to meet the conditions for using the curvature of the scroll.

According to another invention, the longitudinal molded product is cut and then annealed to form a roll. Thereby, the longitudinal molded product when the curvature is not required can be made a product suitable for transportation. If the predetermined length is long, it is inefficient in transportation such as transportation between factories and shipment as a product. Also, if you do not want to maintain the curvature by annealing,
The method for producing a longitudinal molded product according to the present invention is the best, and a longitudinal molded product free from shrinkage due to temperature change is obtained.

Best form 1
Hereinafter, the present invention will be described using embodiments.
FIG. 1 shows the best mode 1, and is a manufacturing process diagram for explaining a manufacturing method of a longitudinal molded product that is annealed after being formed into a scroll, and FIG. 8 is an example of a longitudinal molded product to be produced. Tube 1 is shown.

In the manufacturing process by extrusion molding of the longitudinal molded product shown in FIG. 1, the resin material constituting the hollow tube 1 is polypropylene (PP), polyethylene (PE), olefin-based plastic elastomer (TPE), styrene-based material. Resins having flexibility after solidification, such as TPE, polyamide-based TPE, and urethane-based TPE, are used.

In the hollow tube 1, the resin is put into a hopper 11 of an extrusion molding machine 10, and is discharged from a discharge port of an extrusion head 14 by a screw 13 while being heated and melted by a cylinder 12. The molding die 15 attached to the extrusion head 14 is molded into an elongated molded product having a predetermined cross-sectional shape and extruded. The extruded hollow tube 1 is cooled to near room temperature by the cooling water 22 in the cooling tank 21 of the cooler 20.

Although the cooling water 22 in the cooling tank 21 is set to 15 ° C., it is exposed to a high-temperature extruded product, and thus the cooling water temperature rises. In order to prevent this, the cooler 20 is provided with a drain port 24 and a water supply port 23 for circulating the coolant in the lower part of the cooler 20. The cooling water 22 that has exited the drainage port 24 for circulating the cooling water is cooled by the cooling device 25, returned from the water supply port 23 of the cooler 20 to the cooler 20, and circulated so as to maintain a constant temperature. Cooling water 2 by this circulation
The temperature of 2 is kept constant, and cooling in the production process of the longitudinal molded product formed by extrusion molding is stably performed.

The cooled hollow tube 1 is continuously marked in the longitudinal direction by the marker 33 installed on the take-up path while being taken by the take-up machine 30. This marking is marked on the portion corresponding to the inner surface side A as shown in FIG. As described later, the marking for determining the curl makes the attachment and assembly direction of the longitudinal molded product, for example, to the printer device obvious, and is effective in improving productivity.

The take-up machine 30 has a mechanism for adjusting the height of the take-up part so as to be compatible with various shapes of long-shaped molded products. The elevator 32 can be moved up and down by rotating the elevation adjustment handle 31.
It is adjusted to a height that matches the cross-sectional shape of the extruded molded product.

The hollow tube 1 that has passed through the take-up machine 30 is wound around the take-up drum 41 by a predetermined length while being wound around the take-up drum 41, for example, 4 m, etc. It is wound on a winding drum 41 that is automatically rotated. The wound drum 42 cut into a predetermined length becomes one product unit and is sequentially produced as a drum-wound product. A predetermined number of wound drums 42 on which the predetermined length of the hollow tube 1 is wound are placed on the drum stacking tray 40. After a predetermined number of wound drums 42 are placed on the drum loading tray 40, the drum loading tray 40 is sent to the annealing machine 50 and put into the furnace 52.

The annealing machine 50 is a closed furnace and has an input door 53 and an extraction door 54. The annealing machine 50 has a heating part 51 at the bottom of the furnace, and heats the furnace 52 from below. The drum loading tray 40 on which the wound drum 42 is placed is completely charged into the furnace 52 of the annealing machine 50 from the charging door 53 of the annealing machine 50. After loading the loading tray, the loading door 53 is completely closed and heated at a predetermined temperature, for example, 70 ° C., for a predetermined time, for example, 2 hours. After the heating is completed, the product is taken out from the take-out door 54 facing the input door 53. Since the forced shrinkage is rapidly performed by this annealing, the hollow tube 1 having no shrinkage change after the annealing is manufactured.

FIG. 4 shows the length of the longitudinal molded product manufactured by the above-described manufacturing method and then annealed and then contracted over time with respect to the length when the longitudinal molded product is not annealed and wound. It is the graph which compared the change of the rate by experiment.

In the experiment, in order to confirm the effect of annealing, when the product was made into a scroll-like longitudinal molded product without annealing, in detail, after extrusion molding, cooled, cut into a predetermined length and then wound into a scroll, the room temperature was 25 ° C. The time change of the contraction rate in the longitudinal direction was examined in a room kept in a room. As a result, it was found that the contraction rate became saturated after about 4 hours, and the contraction rate did not change regardless of the elapsed time thereafter.

On the other hand, in the case of a longitudinal molded product that has been annealed after being formed into a scroll shape, the annealing is performed for 2 hours after about 4 hours from the start of standing at room temperature 25 ° C., where the shrinkage of the scroll-shaped longitudinal molded product that is not annealed is saturated. went. Thereafter, it was allowed to stand at the room temperature, and the change with time of the shrinkage was confirmed.

A longitudinal molded product that has been annealed after being formed into a scroll shape will have a larger shrinkage rate than the case of standing at room temperature at the end of annealing, and then saturates. Furthermore, the contraction rate did not change over time. In other words, the maximum contraction rate is obtained immediately after the end of annealing for the longitudinal molded product in the form of a roll.

A longitudinal molded product manufactured by the above-described manufacturing method in which annealing is performed after the longitudinal molded product is formed into a scroll shape is a molded product that does not undergo shrinkage change in the longitudinal direction in an environment below the annealing temperature.

The usefulness of annealing is to saturate the contraction rate in the longitudinal direction in a short time when manufacturing a longitudinal molded product in a rolled state, and when used as a product, the reliability in contraction against environmental temperature changes is ensured. It is to be obtained. In the case of the manufacturing method described above, the convenience of being able to be immediately transported as a product immediately after the completion of manufacture and to be immediately assembled into the product is obtained by making the scroll shape.

FIG. 6 is a conceptual diagram showing a result of an experiment conducted on the timing at which annealing is performed after extrusion molding of a longitudinal molded product. FIG. 6 shows that, in the case of annealing in the same environment, the amount of shrinkage that saturates is almost the same regardless of the time point after the production of the longitudinal molded product. In view of the manufacturing cost with respect to time, it is most efficient in terms of production that the annealing process is performed on the winding drum by the above manufacturing method when the winding is completed.

Further, since the longitudinal molded product molded by the above manufacturing method is put into a furnace in a predetermined length unit and annealed, all parts of the longitudinal molded product are heat-treated at the same time. Since any part of the longitudinal molded product after the heat treatment is subjected to uniform treatment, there is an advantage that product unevenness does not occur.

Furthermore, since not only the hollow tube 1 but also various cross-sectional shapes, thicknesses, and materials are used for the longitudinal molded product, annealing is preferably performed at about 60 ° C. or more for about 1 hour or more.

The longitudinal molded product produced when the present invention is implemented is most suitable when it is used after being deformed into a J-shape or a U-shape, such as the curved tube 76 of FIG. This is because the manufactured longitudinal molded product maintains the curvature because it is annealed as a scroll. In other applications, when using a longitudinal molded product having flexibility, the bending is often required. The utility value of a longitudinal molded product having a curvature in itself and having flexibility without contraction in the longitudinal direction is high.

Since the tube 1 as a longitudinal member is wound on a drum, the tube 1 has a curl so that the inner surface side A of the curl is the tube 1 (76) as a product as shown in FIG.
When assembling, it is usual to assemble so as to coincide with the inner surface A of the tube 1 (76) of this product. When the inner surface A of the curl is assembled so as to face the outer surface B of the tube 1 (76) of the product, the reaction force (moment) in the winding direction existing in the tube 1 acts on the carriage 75. The head is supported by the carriage 75, and the head positioning accuracy is deteriorated. In the present embodiment, marking such as coloring with the marker 33 in advance is performed on the portion corresponding to the inner surface A when the tube 1 is wound around the drum,
The assembly direction as a product can be determined at a glance, and the tube 1 can be assembled without any reaction force. The marking may be attached to the outer surface side B when the drum is wound so that the outer surface side B can be identified.

Best form 2
FIG. 2 (a) shows another embodiment of the manufacturing method of the longitudinal molded product to be annealed. In Embodiment 2, a manufacturing method is described in which a long shaped product is molded, cut to a predetermined length, and then annealed in a state of extending straight in the extrusion direction.

In the manufacturing method of aspect 1, since the annealing process is performed after winding onto the winding drum 41, when a longitudinally shaped product is used as a product, the product has a curvature, which may not be preferable depending on the use site. . In addition, when a longitudinal molded product is directly used as a part of a production line, it may be more efficient if it is manufactured in a straight state, that is, a straight product.

The manufacturing method of Form 2 does not perform annealing after winding as in Form 1, but does not perform winding, and after the longitudinal shaped product is straightly stretched after molding, it is cut to a predetermined length, for example, 4 m In this manufacturing method, a predetermined quantity is placed on the placing plate 61 in the long tray 60 so as not to overlap in the vertical direction in this linear state, and the long tray 60 is annealed together in the annealing machine 50.

A straight product having a predetermined length, which is cut in a state of being extended to a predetermined length by the cutting blade 34, is placed on the mounting plate 61 of the long tray 60 in the longitudinal direction as shown in FIG. They are placed so that they are side by side and do not overlap. This is because annealing is applied, and when the cut molded product is placed on the tray so as to overlap in the vertical direction, the heat treatment is uneven, and the molded product placed above the longitudinal molded product placed at the bottom of the tray. This is to avoid the weight of the product and the deformation of the cross-sectional shape. The mounting plate 61 of the long tray 60 may be formed of a wire mesh. The wire mesh is from the heating unit 51 to the long tray 60.
The longitudinal molded product may be provided so as not to be locally heated by the heat directly transmitted to. Instead of the wire mesh, a heat-resistant material such as ceramic may be used. Moreover, a heat-resistant material may be placed in multiple stages, and a longitudinal molded product may be placed on each heat-resistant material.

A straight long product that is cut to a predetermined length is a mounting plate 61 for a long tray 60.
When a predetermined amount is placed on top, the long tray 60 is put into the annealing machine 50. The annealing machine 50 is the same as that used in the first embodiment, and has a closing door 53 and an extraction door 54 in a closed furnace. The annealing machine 50 has a heating unit 51 at the bottom of the furnace 52 and heats the furnace 52 from below.
In addition, in order to make heating efficiency favorable, you may install the heating part 51 also in the upper part of the mounting board 61, and may heat it from upper and lower sides. The tray on which the straight elongated product is placed is completely put into the furnace 52 of the annealing machine 50 from the annealing machine charging door 53. After the charging, the charging door 53 is completely closed and heated at a predetermined temperature for a predetermined time. After the heating is completed, the extraction door 5 facing the input door 53
4 is taken out. As a result, a straight product having a straight shape with no shrinkage in the temperature change in a straight stretched state can be obtained.

FIG. 5 is a graph showing results obtained by experiments with respect to the shrinkage rate in the case where a straight product in a straight stretched state is annealed after being cut to a predetermined length and when it is not annealed. .

The experiment was carried out in order to confirm the shrinkage effect by annealing on the longitudinal length of the straight molded product, as in the case of the scroll.

After the longitudinal molded product is cut to a predetermined length, the straight longitudinal molded product that is straightly stretched is not annealed, and is left at room temperature at 25 ° C. after the production is finished.
It was found that the shrinkage rate became saturated after the time, and the shrinkage rate did not change regardless of the subsequent standing time.

On the other hand, in order to investigate the change in shrinkage caused by annealing a straight product that has been straightened after being cut to a predetermined length, a straight product that has not been annealed is examined. Annealing was performed for 2 hours after about 4 hours from the start of standing at a room temperature of 25 ° C., at which the shrinkage of the film was saturated. Thereafter, it was allowed to stand at the room temperature, and the change with time of the shrinkage was confirmed.

The effect of shrinkage due to annealing of a straight, long shaped molded product is different from the effect of annealing in the form of a roll manufactured in the form 1, and the effect of heating is maintained even after the heating is completed, and the shrinkage change is about 1 hour. As a result, it was found that the contraction rate did not change in about 1 hour after the annealing.

A straight, elongated product that has been extruded and annealed by the above manufacturing method and has a predetermined length is a product that does not undergo shrinkage changes in the length direction when the temperature changes below the annealing temperature. It becomes.

The usefulness of this annealing treatment is that when manufacturing a straight elongated product in a straight state, the shrinkage is saturated in a short time, and the shrinkage with respect to the temperature change in the length direction due to the elongated product. In contrast, a reliable product can be obtained. And in the said manufacturing method, it becomes usable as a product after 1 hour of annealing treatment.

Further, since the straight longitudinal molded product molded by the above manufacturing method is annealed in units of a predetermined length, all parts of the longitudinal molded product are simultaneously heat-treated. Any part of the processed long shaped product is processed uniformly and no product unevenness occurs. Other uses include
You may anneal the predetermined length of the elongate molded product of the state extended straight by the dimension according to the utilization purpose.

Best form 3
Considering the actual usage form of the longitudinal molded product, the longitudinal molded product produced in the above-described form 2 and subjected to the annealing process in a straight stretched state is inefficient in transportation and the like. is there. Therefore, as shown in FIG. 3, after the form 2 is carried out, the drum is wound around the winding drum 41, so that a straight-shaped drum 80 having a longitudinal shape that does not maintain the curvature can be obtained. This form is an effective method in the factory or during transportation as a product.

The manufacturing process figure which anneals as a roll after cut | disconnecting a longitudinal molded product to predetermined length. The figure which shows the form which anneals a straight thing. The figure which shows the other form made into a scroll after annealing a straight thing. The graph which showed the contraction effect by the presence or absence of annealing in a roll state. A graph showing the shrinkage effect of annealing in a straight state. The conceptual diagram which investigated the effect of annealing by the difference in the leaving time after a cutting | disconnection. 1 is a schematic configuration diagram of a write format printer. The conceptual diagram of the hollow tube as an example of a longitudinal molded product. Schematic which made the long-form molded product of predetermined length into the scroll.

Explanation of symbols

1 hollow tube, 10 extrusion molding machine, 11 hopper, 12 cylinder,
13 screw, 14 extrusion head, 15 mold for molding, 20 cooler,
21 Cooling tank, 22 Cooling water, 23 Water supply port, 24 Drain port, 25 Cooling device,
30 Lifting machine, 31 Lifting adjustment handle, 32 Lifting machine, 33 Marker,
34 cutting blade, 40 drum loading tray, 41 take-up drum,
42 Drum already wound, 50 annealing machine, 51 heating section, 52 furnace,
53 loading door, 54 exit door, 60 long tray, 61 mounting plate,
70 light format printer (LFP), 71 first cartridge,
72 second cartridge, 73 tube, 74 branch, 75 carriage,
76 curved tube, 80 straight wound drum,
91, 92, 93, 94 hole, A inner surface side, B outer surface side.

Claims (7)

In a method for producing a longitudinal molded product having a predetermined length, which is formed by extruding and cooling a resin and then cutting into a predetermined dimension, the longitudinal molded product is annealed by applying a predetermined temperature after the cooling. A method for producing a longitudinal molded product. The method for producing a longitudinal molded product according to claim 1, wherein the resin is extruded into a tubular shape and formed into a tube. The method for manufacturing a longitudinal molded product according to claim 1, wherein the annealing is performed after the longitudinal molded product is cut. The method for producing a longitudinal molded article according to claim 1, wherein the annealing is performed at about 60 ° C or more for about 1 hour or more. 2. The method for producing a longitudinal molded product according to claim 1, wherein the annealing is performed by being put in a furnace. 2. The method for producing a longitudinal molded product according to claim 1, wherein the longitudinal molded product is formed into a wound state after being cut and annealed in the wound state. 2. The method for producing a longitudinal molded product according to claim 1, wherein the longitudinal molded product is annealed after being cut and then turned into a wound state.

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