JP2010005577A - Manufacturing method of molded product with bristle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for allowing a molded product to be subjected to bristle implanting with good appearance by connecting a die molding part to an extrusion molding part. <P>SOLUTION: The manufacturing method for implanting the bristle 42 to the die molding part 30 of the molded product 10 by connecting the die molding part 30 to the extrusion molding part 20 implanted with the bristle 41 on the surface, includes processes of: impregnating water W to the bristle 41 implanted to the extrusion molding part 20 side from a boundary face of the extrusion molding part 20 and the die molding part 30; forming an adhesive layer applied with an adhesive 50 on the surface of the die molding part 30; electrostatically implanting a pile 42 to the die molding part on the adhesive 50; and curing the adhesive layer for curing the adhesive 50 electrostatically implanted with the pile 42 by heat treatment. The water W impregnated into the bristle 41 implanted in the extrusion molding part 20 side in the impregnation process is discharged so as to come in contact with the adhesive 50 applied in the adhesive layer forming process. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for producing a molded article with flocking, for example, in which flocking is performed on the surface of a molded article such as a weather strip for automobiles.

As shown in FIG. 4, in the corner portion of the weather strip (glass run) 10 for automobiles, the flocks 41, 41 are formed on the outer surface of the molded product formed by connecting the two extrusion-molded portions 20, 20 with the mold-molded portion 30. What gave 42 is known.
The weather strip 10 is formed by setting two extrusion molding parts 20, 20, which are already semi-finished products of flocking 41, to a mold, and flowing a molding material between the extrusion molding parts 20, 20 to form and connect them. The processed product is manufactured by newly applying flocking 42 to the molded part 30 by secondary processing. The flocking 42 in the secondary processing is usually performed by electrostatic flocking of the pile.

The flocks 41 and 42 applied to the weather strip (grass run) 10 shown in FIG. 4 are provided on the sliding contact surface with the door glass to suppress the generation of abnormal noise and smoothly slide. However, the weather strip which improved the designability by giving a flock to the design surface of a trim part is also known (for example, refer to patent documents 1).
JP 2007-131094 A

However, in the case of the weather strip (glass run) 10 shown in FIG. 4, as shown in FIG. 5, a portion having a poor appearance or a flocked portion near the boundary between the extruded portion 20 and the molded portion 30 that has already been flocked 41. There was a problem that parts with different tactile sensations of 41 and 42 occurred.
That is, when the adhesive 50 is applied to the surface of the molded part 30, as shown in FIG. 5A, if the adhesive 50 adheres to the extruded part 20 that has already been planted 41, the adhesive 50 is As a result of adhering or further flocking on the adhesive, a raised step T is generated, and the flocking feel and the raised state of the flocking pile are different from those of other parts.
On the contrary, there is a method of masking the adhesive 50 so that the adhesive 50 does not adhere to the extruded part 20 that has already been implanted 41, but it is difficult to completely prevent the adhesive 50 from adhering. Further, as shown in FIG. 5B, when the application range of the adhesive 50 is set to the front (on the mold forming part 30 side) from the boundary surface with the extrusion molding part 20, an uncoated part of the adhesive 50 is formed. As a result, a part K lacking the flocked hairs 42 is generated and the parting line C on the boundary surface is exposed, resulting in poor appearance.
Further, as shown in FIG. 5C, even when the adhesive 50 protrudes from the boundary surface (the protruding portion 50a), the appearance is deteriorated.

  In the weatherstrip described in Patent Document 1, since colored flocking is applied to the extruded portion, a step generated near the boundary surface between the extruded portion and the molded portion as shown in FIG. There is no description about the problem of appearance defects due to cuts or flocks of hair transplantation, and means for solving the problem.

  Accordingly, an object of the present invention is to provide a manufacturing method for applying flocking to a molded product obtained by connecting a molded part to an extruded part.

In order to achieve the above object, the invention according to claim 1 is directed to a non-planted product (10) having a primary flocked part (20) having a flocked surface (41) and a non-flocked part (30) on the surface. A method for producing secondary flocking (42) on a flocked site (30),
An impregnation step of impregnating water (W) or a solvent into the flocking (41) applied on the primary flocking site (20) side from the boundary surface between the primary flocking site (20) and the non-flocked site (30);
An adhesive layer forming step of applying an adhesive (50) to the surface of the non-planted part (30);
A flocking step of electrostatically flocking the pile (42) from above the adhesive (50);
An adhesive layer curing step in which the pile (42) electrostatically flocked adhesive (50) is cured by heat treatment;
Water (W) or solvent impregnated in the flocking (41) applied on the primary flocking site (20) side in the impregnation step is allowed to flow out so as to contact the adhesive (50) applied in the adhesive layer formation step. It is characterized by that.

Moreover, the invention which concerns on Claim 2 can be applied to the non-planted part (30) of the molded product (10) having the primary flocked part (20) and the non-flocked part (30) having the flocked (41) on the surface. A manufacturing method for applying the next flocking (42),
An impregnation step of impregnating water (W) or a solvent into the flocking (41) applied on the primary flocking site (20) side from the boundary surface between the primary flocking site (20) and the non-flocked site (30);
An adhesive layer forming step of applying the adhesive (50) to the surface of the non-planted part (30) separately from the boundary surface;
A mold forming part flocking step of electrostatic flocking the pile (42) from above the adhesive (50);
An adhesive layer curing step in which the pile (42) electrostatically flocked adhesive (50) is cured by heat treatment;
Water (W) or solvent impregnated in the flocking (41) applied on the primary flocking site (20) side in the impregnation step is allowed to flow out so as to contact the adhesive (50) applied in the adhesive layer formation step. It is characterized by that.

  Further, in the invention according to claim 3, the primary flocking site (20) is an extrusion molding portion (20), and the non-flocked site (30) is a mold forming portion (30) connected to the extrusion molding portion. It is characterized by.

  Furthermore, the invention according to claim 4 is characterized in that the molded product (10) is an automotive weather strip (10).

  In the invention according to claim 5, in the impregnation step, the flocking (41) applied to the primary flocking site (20) side is impregnated with a polar solvent that does not separate from the aqueous adhesive, and the adhesive layer forming step Then, the adhesive (50) is an aqueous adhesive.

  In the invention according to claim 6, in the impregnation step, the flocking (41) applied to the primary flocking site (20) side is impregnated with water (W), and in the adhesive layer forming step, the adhesion is performed. The agent (50) is a water-based adhesive.

  In the invention according to claim 7, in the impregnation step, the flocking (41) applied to the extruded portion (20) side is impregnated with a nonpolar solvent that does not separate from the solvent-type adhesive, and the adhesive layer In the forming step, the adhesive (50) is a solvent-type adhesive.

  The invention according to any one of claims 1 to 7 is not limited to the one in which the adhesive layer forming step is performed after the impregnation step, but the one in which the impregnation step and the adhesive layer forming step are performed simultaneously. What includes an impregnation step after the layer formation step is also included.

  The symbols in parentheses indicate the aspect elements or corresponding matters described in the drawings and the best mode for carrying out the invention described later.

According to the method for producing a molded product with flocking according to claim 1 of the present invention, the secondary flocking is performed on the non-flocked part of the molded product having a primary flocked part and a flocked part having a flocked surface. In the case of applying, for example, as in the invention according to claim 3, when flocking is performed on a molded part connected to an extruded part having a flocked surface, particularly the boundary between the extruded part and the molded part An impregnation step for impregnating water or a solvent into the flocks applied to the extrusion molding side from the surface is provided, and water or a solvent impregnated into the flocks applied to the extrusion molding side is flowed out and applied in the adhesive layer formation step Since the adhesive is brought into contact with the adhesive, the adhesive dissolves or disperses in water, and wets and spreads to the boundary surface between the extrusion-molded portion and the molded portion.
Then, the pile is uniformly planted from the boundary surface between the extrusion-molded part and the mold-molded part to the mold-molded part side by electrostatically flocking the pile from the adhesive by the mold-molded part flocking process. .
In addition, the adhesive adhering to the flock is also dissolved or dispersed in water or a solvent, and moves from the top of the flock to the root side of the flock.
As a result, it is possible to prevent a visible large step or swell from occurring near the boundary between the extrusion molding part and the molding part, so that the tactile feel and napping state of the flocking is not different from the others and is uniform and attractive. A molded product with good flocking, for example, a weather strip for an automobile as in the invention according to claim 4 is obtained.
Thereafter, the flocking is prevented from falling off from the mold-formed portion by an adhesive layer curing step in which the adhesive on which the pile is electrostatically implanted is cured by heat treatment.

  Further, according to the method for producing a molded product with flocking according to claim 2 of the present invention, secondary flocking is performed on the non-flocked part of the molded product having a primary flocked part having a flocked surface and an unflocked part. For example, as in the invention according to claim 3, in the case where flocking is performed on a molded part connected to an extruded part having a flocked surface, in the adhesive layer forming step, the molded part is formed. Even if the adhesive is applied to the surface of the mold separately from the boundary surface, the adhesive is guided to the boundary surface, and when the pile descends, the flocking is uniformly applied from the boundary surface to the mold part side. Therefore, when applying the adhesive, it is possible to avoid the risk of accidentally applying it onto the flocks of the extrusion molding part, and it is not necessary to apply the adhesive to the boundary surface, and it is not necessary to apply the skill. Excellent workability because it is not required.

  Furthermore, according to the invention described in claims 5 to 7, since the adhesive that is compatible with the water or the solvent impregnated in the flocking step in the impregnation step and is easy to be applied is applied in the adhesive layer forming step, the adhesive Is easily and instantaneously guided to the boundary surface between the extruded portion and the molded portion.

(First embodiment)
With reference to FIG. 1, the manufacturing method of the molded article with a flocking which concerns on 1st embodiment of this invention is demonstrated. FIG. 1 shows a manufacturing process of a molded product with flocking according to the first embodiment of the present invention, and corresponds to an enlarged sectional view taken along line AA of FIG. The same parts as those shown in the conventional example are denoted by the same reference numerals. In this embodiment, an automotive weather strip (glass run) 10 will be described as an example of a molded product with flocking.

This manufacturing method is a method of performing secondary flocking on the non-planted portion of a molded product having a primary flocked portion and a flocked portion having a flocked surface, and the primary flocked portion of an automotive weather strip The extrusion molding part 20 is applied, and the automotive weatherstrip mold molding part 30 is applied as an unimplanted part. That is, it is a method of newly applying flocking 42 to the molded part 30 of the automotive weather strip 10 in which the molded part 30 is connected to the extruded part 20 whose surface is previously provided with the flocked 41 at the time of extrusion molding. .
In the mold connection, the end portions of the two extruded parts 20 and 20 which are semi-finished products which have already been subjected to flocking 41 at the same time as the extrusion are set in the mold, and then the mold is inserted between the two extruded parts 20 and 20. Although it is performed by flowing a molding material and is not shown, it is applied to a corner portion of a side door of an automobile.

  In order to newly apply flocking 42 to the molded part 30 of the automotive weather strip 10 formed in this way, the following impregnation process, adhesive layer forming process, and molded part as shown below A flocking process and an adhesive layer curing process are performed.

  First, in the impregnation step, as shown in FIG. 1A, from the boundary surface between the extrusion molding part 20 and the molding part 30 of the automotive weather strip 10 to the extrusion molding part 20 side (left side in FIG. 1). The applied flock 41 is impregnated with water W. Although it does not specifically limit as an impregnation method, Here, the water W was applied to the flock 41 by using a brush so that the water W would flow to the root of the flock 41.

Next, in the adhesive layer forming step, as shown in FIG. 1B, the adhesive 50 is applied to the surface of the molded part 30 to form an adhesive layer. The adhesive 50 is applied from the boundary surface with the extruded part 20 to the mold part 30 side. The adhesive 50 is preferably an aqueous adhesive that has a good compatibility with water and has the property of being dissolved or dispersed in water and spreading wet, and the aqueous adhesive was also used in this embodiment.
As a result, the water W impregnated in the extrusion molding part 20 flows out and comes into contact with the adhesive applied to the molding part 30, and the adhesive dissolves or disperses in the water W, so that the extrusion molding part 20 and the molding are molded. It spreads wet to the boundary surface with the part 30.

Next, in the mold forming part flocking process, as shown in FIG. 1C, for example, an air jet for spraying (not shown) from above the adhesive 50 in a state where a voltage is applied to the mold forming part 30. ) To lower the charged pile 42 and electrostatically implant the adhesive layer.
As a result, the charged pile 42 is uniformly planted from the boundary surface with the extrusion molding unit 20 to the mold molding unit 30 side.

  Next, in the adhesive layer curing step, the adhesive 50 in which the pile 42 is electrostatically implanted is cured by heat treatment. This prevents the piled pile 42 from falling off the adhesive layer. When the pile 42 applied to the extrusion molding unit 20 side by blowing air or the pile 42 remaining without being flocked to the adhesive layer on the mold molding unit 30 side is blown off, the appearance as shown in FIG. The weather strip 10 for automobiles, which is a molded product with flocking that is well flocked, is completed.

When the performance of the automotive weather strip 10 thus completed is compared with the performance of the automotive weather strip 10 completed by the conventional manufacturing method, a table as shown in FIG. 3 is obtained.
That is, according to what was manufactured by the method of the prior art example, like the sample (n1) and the sample (n2), between the extrusion molding part 20 which is a semi-finished product, and the shaping | molding part 30 shape | molded using the metal mold | die Even if the gap is 0 mm, as shown in FIG. 5A, the step T between the extrusion-molded portion 20 and the mold-molded portion 30 becomes as large as 2.0 mm or 1.5 mm. In addition to the feeling of touching with a finger, the appearance is also poor because of a large step T. Further, as shown in FIG. 5B, as in the sample (n3), as shown in FIG. 5B, when the gap is 0.8 mm, the extrusion molding unit 20 and the mold molding unit 30 Even if the step T with respect to the mold forming part 30 is 0.5 mm, in addition to the poor touch feeling of the flocked hair 42, the appearance is also deteriorated due to the lack of flocked hair.
On the other hand, what is manufactured by the method of the first embodiment of the present invention is that the extruded part 20 and the molded part 30 are formed as shown by the sample (n1), the sample (n2), and the sample (n3). The gap between them is 0 mm, and the step between the extrusion molding part 20 and the mold molding part 30 is also a very small value such as 0.2 mm or 0.3 mm. It looks good.

  According to the automotive weather strip 10 according to the first embodiment of the present invention configured as described above, there is no step or rise in the vicinity of the boundary surface between the extrusion-molded portion 20 and the mold-molded portion 30. Even if a step is generated, it is so slight that it cannot be recognized with the naked eye, so that the tactile sensation and the raised state of the flocked hair 42 are not different from each other and are uniform.

(Second embodiment)
Next, with reference to FIG. 2, the manufacturing method of the molded processed product with hair transplantation which concerns on 2nd embodiment of this invention is demonstrated. FIG. 2 shows a manufacturing process of the molded product with flocking according to the second embodiment of the present invention, and corresponds to an enlarged sectional view taken along line AA of FIG. The same parts as those shown in the first embodiment of the present invention are denoted by the same reference numerals. In the present embodiment, as in the first embodiment, an automotive weather strip (glass run) 10 will be described as an example of a molded product with flocking.

Compared with the manufacturing method according to the first embodiment, the manufacturing method according to the second embodiment includes an impregnation step, an adhesive layer forming step, a molded part flocking step, and an adhesive layer curing step. Although common in respect, the range in which the adhesive 50 is applied is different in the adhesive layer forming step.
That is, in the adhesive layer forming step, as shown in FIG. 2B, the adhesive 50 is applied to the surface of the molded part 30 with a predetermined distance L from the boundary surface.

  The predetermined distance L shown here means that in the impregnation step, the water W impregnated in the extrusion molding part 20 flows out and comes into contact with the adhesive applied to the mold molding part 30, and the adhesive 50 is dissolved or dispersed in the water W. Thus, the distance can wet and spread to the boundary surface between the extrusion molding portion 20 and the mold molding portion 30.

  According to this, in the adhesive layer forming step, even if the adhesive 50 is not applied up to the boundary surface between the extrusion molded portion 20 and the mold forming portion 30, the adhesive 50 is guided at the boundary surface, As a result, as shown in FIGS. 2 (c) and 2 (d), when the pile 42 is lowered, the flocking 42 is uniformly applied to the mold forming part 30 side from the boundary surface, so the adhesive 50 is applied. In some cases, it is possible to avoid the risk of accidental application onto the flocks 41 of the extrusion molding part 20, and it is not necessary to apply the adhesive 50 to the boundary surface, so that no special skill is required. Excellent in properties.

  In the first and second embodiments of the present invention, the adhesive layer forming step is performed after the impregnation step, but the impregnated water and the adhesive come into contact with each other to dissolve or disperse, and the extruded portion. As long as the flocks 42 can be aesthetically pleasing at the interface between the mold 20 and the molded part 30, the impregnation step and the adhesive layer formation step may be performed simultaneously, and the impregnation step follows the adhesive layer formation step. May be performed.

  Moreover, in 1st, 2nd embodiment of this invention, although the water-based adhesive was used as an adhesive which is easy to adapt to water W, it replaces with water W, and the flock 41 applied to the extrusion molding part 20 side is made into alcohol. A polar solvent that does not separate from the aqueous adhesive such as methyl ethyl ketone may be impregnated. Alternatively, in the impregnation step, the flocks 41 applied to the extruded portion 20 side are impregnated with a nonpolar solvent that does not separate from solvent-type adhesives such as toluene and xylene, and in the adhesive layer formation step, the adhesive 50 is used as the solvent. A mold adhesive may be used.

  In the first and second embodiments of the present invention, the method for manufacturing the weather strip 10 for automobiles as a molded product with flocking has been described. However, the present invention is not limited to this, and extrusion molding with flocking is performed. Any method can be applied as long as it is a manufacturing method of a molded product with flocking, in which flocking is performed as a secondary process on the molded part connected to the part.

  Further, in the first and second embodiments of the present invention, an explanation has been given by taking an example of an extrusion-molded product as a primary flocking site and a molded part connected to an extrusion molding unit as a non-flocked site, but the present invention is not limited thereto. For example, it can be applied to the reworking process when the flocking applied to the extrusion molding part is partially lost due to defective application of the adhesive. Alternatively, the present invention can also be applied to a case where a part of the extrusion-molded part to which flocking has been applied is cut out and then further flocked is required.

It is the AA line expanded sectional view of FIG. 4 which shows the manufacturing process of the molded article with a flocking which concerns on 1st embodiment of this invention. It is the AA line expanded sectional view of FIG. 4 which shows the manufacturing process of the molded article with a flocking which concerns on 2nd embodiment of this invention. It is a top view which shows the table | surface which compared the performance of the molded article with a flock manufactured with the manufacturing method which concerns on 1st embodiment of this invention, and the molded article with a flock manufactured with the manufacturing method which concerns on a prior art example. It is a perspective view which shows an example of the molded product with hair transplantation. FIG. 5 is an enlarged cross-sectional view taken along the line AA in FIG. 4, showing a molded product with flocking manufactured by the manufacturing method according to the conventional example, in which (a) shows a step, and (b) shows a flocking defect. And (c) show the case where the adhesive protruded.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Weather strip 20 Extrusion part 30 Molding part 41 Flocking 42 Flocking 50 Adhesive 50a Adhesive protrusion part C Parting line K The part lacking flocking L Predetermined distance T Step

Claims (7)

A method for producing secondary flocking on a non-planted part of a molded product having a primary flocked part and a flocked part having a flocked surface,
An impregnation step of impregnating water or a solvent into the flocking applied to the primary flocking site side from the boundary surface between the primary flocking site and the non-flocked site;
An adhesive layer forming step of applying an adhesive to the surface of the non-planted part;
A secondary flocking step of electrostatic flocking the pile from above the adhesive;
An adhesive layer curing step of curing the adhesive in which the pile is electrostatically implanted by heat treatment;
Molded product with flocking, characterized in that water or solvent impregnated in the flocking applied to the primary flocking site side in the impregnation step is allowed to flow out and contact the adhesive applied in the adhesive layer formation step Manufacturing method. A method for producing secondary flocking on a non-planted part of a molded product having a primary flocked part and a flocked part having a flocked surface,
An impregnation step of impregnating water or a solvent into the flocking applied to the primary flocking site side from the boundary surface between the primary flocking site and the non-flocked site;
An adhesive layer forming step of applying an adhesive away from the boundary surface on the surface of the unplanted site;
A secondary flocking step of electrostatic flocking the pile from above the adhesive;
An adhesive layer curing step of curing the adhesive in which the pile is electrostatically implanted by heat treatment;
Molded product with flocking, characterized in that water or solvent impregnated in the flocking applied to the primary flocking site side in the impregnation step is allowed to flow out and contact the adhesive applied in the adhesive layer formation step Manufacturing method. The method for producing a molded product with flocking according to claim 1 or 2, wherein the primary flocking part is an extrusion molding part, and the non-flocking part is a mold part connected to the extrusion molding part.   The method for manufacturing a molded product with flocking according to any one of claims 1 to 3, wherein the molded product is a weather strip for automobiles.   In the impregnation step, the flock applied on the primary flocking site side is impregnated with a polar solvent that does not separate from the aqueous adhesive, and in the adhesive layer forming step, the adhesive is used as an aqueous adhesive. The manufacturing method of the molded article with flocking as described in any one of Claims 1 thru | or 4.   In the impregnation step, water is impregnated into the flocks applied to the primary flocking site side, and in the adhesive layer forming step, the adhesive is an aqueous adhesive. A method for producing a molded article with flocking according to any one of the above.   In the impregnation step, the flock applied on the primary flocking site side is impregnated with a nonpolar solvent that does not separate from the solvent-type adhesive, and in the adhesive layer formation step, the adhesive is used as a solvent-type adhesive. The method for producing a molded product with flocking according to any one of claims 1 to 4.

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