JP2006239412A - Method of leather processing and leather of three-dimensional shape - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of leather processing can yield a leather retaining a three-dimensional shape, especially the three-dimensional shape with fine, high attractive design, for a long time even without using a large amount of a hardener or the like, and for providing a leather with high stretchability and high restoration property while retaining flexibility inherent to leather, and three-dimensional leather, especially a processed leather with a tie dyeing pattern and shape. <P>SOLUTION: A flat leather is deformed into a three-dimensional shape having recesses and protrusions, at least part of both or either of projections 2 and recesses 1 composing the unevenness is heated and cured, the curing holds the three-dimensional shape, especially, the projections 2 and recesses 1 other than the heated portion are insulated from the heat, and only the heated portion is cured. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a leather processing method and a three-dimensionally shaped leather that are suitably used when three-dimensional processing is applied to leather.

  Conventionally, as a three-dimensional processing method for leather, various techniques are known in consideration of the circumstances peculiar to leather.

As an example, there is an embossing method in which three-dimensional processing is performed using a mold having irregularities. Specifically, first, a desired three-dimensional design is determined, and a male mold and a female mold having irregularities according to the design are created. Thereafter, with the leather sandwiched between the male mold and the female mold, pressure is applied to the mold to press the entire leather. Then, the leather is deformed according to the unevenness of the mold and is subjected to three-dimensional processing. (See Patent Document 1)
In addition, there is a crash processing method in which the leather is shrunk under high pressure and the wrinkle is intentionally exposed as a method of performing the three-dimensional processing easily without requiring the mold or the like.

  However, since the above-described processing method only deforms the entire leather by applying pressure, the unevenness disappears with time, and the original state after the three-dimensional processing cannot be maintained for a long time.

  In particular, for example, a sofa cover or the like is frequently rubbed with a seated person, so that the three-dimensional shape cannot be held earlier. Therefore, the degree of freedom in selecting products that can use the leather is extremely limited.

  In addition, since the pressure is applied to the entire leather when performing the three-dimensional processing, the leather is easily deteriorated.

  In addition, the stamping method and the like need to sequentially prepare molds according to the design, which causes a problem that the production process is complicated as well as causing an increase in production costs. Conventionally, a three-dimensional shape is fixed by applying a curing agent to leather. In this case, since the entire surface of the leather is cured, the obtained leather is poorly stretchable and the leather can be used. The degree of freedom of selection is limited.

  On the other hand, if it is a crash processing method, etc., a mold is not necessary, but it is not possible to make irregularities as intended by the producer, so for example, creating a highly design product with a certain motif I can't.

  Further, for example, products such as gloves need to use a material having high stretchability, so conventionally, when leather is used, it must be used as a composite material combined with a cloth.

JP 7-138600 A

  Therefore, in view of the above situation, the present invention intends to solve the problem that a solid shape, particularly a fine three-dimensional shape can be maintained for a long period of time without using a large amount of a curing agent or the like. A leather processed product that is highly stretchable and retains its flexibility, and has a highly recoverable leather processing method, and a three-dimensional leather, especially a drawing method for leather. The point is to provide.

  In order to solve the above-mentioned problems, the present invention includes a step of transforming a flat leather into a three-dimensional shape having an uneven portion, and at least a part of one or both of the convex portion and the concave portion constituting the uneven portion. And a step of heating and curing, and a leather processing method for maintaining a three-dimensional shape by the curing. Here, the concavo-convex portion indicates a concavo-convex shape portion formed by bending or folding the leather, and a portion protruding to the front surface side is a convex portion and a portion protruding to the back surface side is a concave portion.

  Here, the processing method provided with the process of heat-insulating the remainder except the heating part of the said convex part and a recessed part is preferable. Here, heat insulation refers to preventing at least the heat provided to the leather by heating from being transmitted to the leather to such an extent that the leather cannot be cured. For example, a cover (sealing) to prevent heating liquid from touching, It is exemplified that the leather is actively cooled by bringing the leather close to or in contact with a cooling device through which a cooling medium such as cooling water is passed.

  Further, by inserting a linear fastening material such as a thread or string into a flat leather and narrowing it down in a state in which a plurality of continuous mountain-shaped convex portions having a length are arranged, a three-dimensional structure provided with the concave and convex portions. It is preferable to deform into a shape. Here, narrowing means to squeeze the leather and fix its state. Specifically, the narrowing referred to in the present invention is to squeeze the leather into which the fastening material is inserted along the thread, and to fix the thread that is outside the leather so that the squeezed leather does not spread. In addition to those in which the convex portions are in close contact with each other, those that are gently squeezed so that the space between the convex portions is slightly expanded are included.

  Further, it is preferable that the fastening material is passed through both ends of the convex portion in the length direction or in the vicinity thereof, and the fastening material is passed through both ends of the convex portion in the length direction or in the vicinity thereof, and an intermediate portion. Specifically, it is preferable to pass the fastening material through a position above an intermediate position in the protruding height direction of the convex portion.

  Furthermore, by concentrating on a state in which a plurality of continuous mountain-shaped convex portions having a length are arranged, the side wall portions between the convex portions and the concave portions are superposed with each other to reduce heat conduction from the outside to the side wall portions. It is preferable that the heat-insulated state is set so that the heated liquid is not immersed (penetrated).

  Further, a processing method is preferred in which one of the convex portion and the concave portion is thermally insulated by fixing a heat insulating material in a close contact state from the outside, and the other is heated and cured by a heating means.

  As the heating means, it is preferable to use a heater or at least a heating liquid that immerses the heated portion.

  More specifically, by inserting a linear fastening material such as a thread or string into a flat leather and narrowing it down in a state where a plurality of continuous mountain-shaped convex portions having a length are arranged, And a step of making the side wall portion between the convex portion and the concave portion into a heat insulating state polymerized with each other, a step of immersing the entire leather in a heating liquid, and curing the convex portion and the concave portion, The leather processing method which consists of and hold | maintains a three-dimensional shape by the said hardening is preferable.

  Further, by inserting a linear fastening material such as a thread or string into a flat leather and narrowing it down in a state in which a plurality of continuous mountain-shaped convex portions having a length are arranged, a three-dimensional structure provided with the concave and convex portions. The step of transforming into a shape and making the side wall portion between the convex portion and the concave portion into a heat-insulated state superposed on each other, and the step of thermally insulating one of the convex portion or the concave portion by fixing the heat insulating material in a close contact state from the outside And a step of immersing the entire leather in a heating liquid and curing the other of the convex portion or the concave portion, and a leather processing method for maintaining a three-dimensional shape by the curing.

  When it is desired to dye leather, it is preferable to use a dyeing liquid at a predetermined temperature as the heating liquid.

  Furthermore, it is a preferred embodiment that the synthetic resin or the synthetic resin composition is applied to the outer surface of the leather that retains the three-dimensional shape by curing by applying, spreading, dipping, or the like.

  In addition, the present invention transforms the planar leather into a three-dimensional shape having an uneven portion, and at least a part of one or both of the convex portion and the concave portion constituting the uneven portion is heated and cured, Also provided is a three-dimensional leather characterized in that a three-dimensional shape is maintained by the curing.

  Here, except for the heating part of the said convex part and a recessed part, what heat-insulated the remainder and hardened only the said heating part may be selected.

  Further, by inserting a linear fastening material such as a thread or string into a flat leather and narrowing it down in a state in which a plurality of continuous mountain-shaped convex portions having a length are arranged, a three-dimensional structure provided with the concave and convex portions. In addition to being deformed into a shape, the side wall portion between the convex portion and the concave portion is made into a heat-insulated state, and the entire leather is immersed in a heating liquid to cure the convex portion and the concave portion, and this curing causes the three-dimensional shape to be maintained. A three-dimensional leather characterized by the above is preferable.

  Furthermore, by inserting a linear fastening material such as a thread or string into a flat leather and constricting it into a state in which a plurality of continuous mountain-shaped convex portions having a length are arranged, a three-dimensional structure provided with the concave and convex portions In addition to deforming into a shape, the side wall between the convex part and the concave part is heat-insulated by polymerizing each other, and one of the convex part or the concave part is thermally insulated by fixing the heat-insulating material in a close contact state from the outside, A three-dimensional leather characterized in that the whole is immersed in a heating liquid to cure the other of the convex portion or the concave portion and retain the three-dimensional shape by this curing.

  The ridge lines of each convex part of these leathers are preferably arranged in parallel with each other, and the ridge line of each convex part and the arrangement in the length direction are selected from random in a plan view. Can be done.

  Furthermore, in the case where a plurality of convex portions arranged so that the ridgeline is substantially C-shaped or substantially V-shaped in plan view are provided at predetermined intervals in the vertical and horizontal directions, the developed leather changed in plan view. A three-dimensional shape in which the drawn pattern is formed by irregular convex portions is arranged, and the convex portions have a supporting strength (stiffness) that can retain the three-dimensional shape even when pressed from the surface.

According to the present invention as described above, a three-dimensional shape, in particular, a drawn pattern and shape are given to the leather and maintained by heat curing, so that the retention period of the three-dimensional shape can be dramatically improved. Thus, since it is excellent in three-dimensional shape friction resistance etc., it can be used suitably also for products, such as a sofa with many opportunities to contact a user, and the freedom degree of use selection can be raised.
Moreover, without pressurizing the entire surface of the leather with high pressure as in the past, it is difficult for the leather to deteriorate, the durability of the product using the leather can be enhanced, and three-dimensional processing can be performed without using any chemicals. Since it can be applied, the environment is not adversely affected not only in the leather processing stage but also in the disposal stage.

  Moreover, since the heat insulation part of the heat insulation part except for the heating part of the said convex part and a recessed part was equipped, the original softness | flexibility of the leather is maintained in this heat insulation part, the leather after processing is rich in elasticity, and a three-dimensional shape restoration A highly stretchable material can be obtained. Therefore, for example, a product such as a glove that requires elasticity can be designed only with the leather, and the range of design selection of the product using the leather can be dramatically improved, and can be used for various applications. .

  Further, by inserting a linear fastening material such as a thread or string into a flat leather and narrowing it down in a state in which a plurality of continuous mountain-shaped convex portions having a length are arranged, a three-dimensional structure provided with the concave and convex portions. Since it is deformed into a shape, the side wall portion in the middle of the convex portion and the concave portion is superposed and heat-insulated, and can be prevented from being cured by heating, so that the flexibility of the leather is maintained. Moreover, the provision of the three-dimensional shape and the heat insulation can be performed simultaneously, and the work process can be simplified. Furthermore, since no pressure is applied to the provision of a three-dimensional shape, deterioration of the leather can be prevented. In addition, since a linear fastening material such as a thread or string is inserted and tightened, it is possible to give a fine three-dimensional shape with high design.

  Further, since the fastening material is passed through both ends of the convex portion in the length direction or in the vicinity thereof, more preferably through the ends in the longitudinal direction of the convex portion or in the vicinity thereof and the intermediate portion, the convex portion can be reliably formed at the time of narrowing. .

  Further, by constricting the leather using a plurality of yarn width intervals, it is possible to clearly form a concavo-convex shape, and in particular, at a position above the intermediate position in the protruding height direction of the convex portion, Since the fastening material is passed, the exposed area can be further reduced by more accurately polymerizing the convex portions.

  In addition, by constricting a state in which a plurality of continuous mountain-shaped convex portions having a length are arranged, the side wall portion between the convex portion and the concave portion is made into a heat-insulating state in which the side walls are overlapped with each other. Property is maintained, and good stretchability is obtained in the uneven portion.

  In addition, since one of the convex portion and the concave portion is thermally insulated by fixing the heat insulating material in an intimate contact state from the outside and the other is heated and cured by a heating means, only one is cured, and the other non-cured portion makes the entire leather The flexibility can be improved.

  Further, by using a heater as the heating means, it can be easily heated and cured.

  Further, by using a heating liquid that immerses at least the heated portion as the heating means, it is possible to perform heat curing at a more appropriate and appropriate temperature.

  Moreover, since the dyeing liquid of predetermined temperature was used as a heating liquid, a dyeing process and a three-dimensional processing process can be performed simultaneously, and simplification of a work process can be implement | achieved.

  In addition, since the resin or the resin composition is attached to the outer surface of the leather that retains the three-dimensional shape by curing, the shape retention can be further improved.

  Further, since the ridge lines of the respective convex portions are arranged in parallel with each other, the superposition of the convex portions is facilitated, and heat insulation of the side wall portion and the like can be performed more reliably.

  By arranging the length of the ridge line of each convex part and the arrangement in the length direction at random in a plan view, a substantially uneven shape can be obtained, and the ridge line is a substantially C shape or a V shape in a plan view. An attractive three-dimensional pattern can be provided by providing a plurality of convex portions that are arranged in a shape and give support strength (stiffness) to the leather at intervals in the vertical and horizontal directions.

  Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is an explanatory view showing a typical embodiment of the three-dimensional leather according to the present invention, in which A denotes leather, 1 denotes a concave portion, 2 denotes a convex portion, and 3 denotes a side wall portion.

  As shown in FIGS. 1 to 3, the three-dimensional leather A of the present embodiment is a three-dimensional leather composed of a motif in which the convex portion 2 and the concave portion 1 are combined. And at least a part of one or both of the convex part 2 and the concave part 1 constituting the concavo-convex part is heated and cured, and the solid shape is maintained by the curing.

  More specifically, the heated portion of the convex portion 2 and the concave portion 1 is excluded, the remaining portion is thermally insulated, only the heated portion is cured, and the three-dimensional shape is maintained by the cured portion and the softness is maintained by the thermally insulated portion. In this example, the convex portion 2 is subjected to a thermosetting process described later, insulates other portions including the concave portion 1, and the convex portion 2 and the concave portion 1 have different degrees of flexibility.

  The concave portion 1 has a shape that bulges on the back side of the leather, and a plurality of the concave portions 1 are provided on the entire leather surface according to the design. Since the concave portion 1 is a portion to be dyed at the time of dyeing, which will be described later, it is insulated so as not to come into contact with a dye solution having a temperature, which will be described later.

  Moreover, the convex part 2 has the shape which swells to the surface side of leather, and is provided in multiple numbers by the leather whole surface continuously via the side wall part 3 alternately with the said recessed part 1. FIG. Each convex part 2 is a part which touches a dyeing liquid in the case of heating, and is heated and hardened | cured, and the outer surface of the top vicinity used as the surface exposed outside in the state tightened with the thread | yarn is a dyeing liquid. It is dyed to form a color pattern.

The three-dimensional leather A of this example has a shape formed by the ridge lines of the pair of protrusions 2 and 2 that are arranged in parallel to each other at a predetermined interval along the longitudinal direction and the ridge lines of the protrusions 2 and 2 that are aligned in the lateral direction. In the plan view, they are arranged so as to be substantially C-shaped or substantially V-shaped. The length of the ridge line of each convex portion 2 is random, and the arrangement in the length direction can be also configured at random. Along the ridge line, the top of the convex portion 2 is dyed with a dyeing solution, and the substantially C-shaped or substantially V-shaped color pattern is formed on the leather surface side.
Needless to say, it is not limited to forming a color pattern using a dyeing solution, and forming the pattern into the above-mentioned C shape. It may be a pattern that extends, other patterns, or a completely random pattern.

  Hereinafter, the processing method of the solid leather A according to the present embodiment will be described in detail.

  As shown in FIG. 4, the processing method of this embodiment first selects a flat leather material, designs and writes a sketch (S 1), and a linear fastening material such as a thread or string on the leather A. Is inserted into the three-dimensional shape having the concavo-convex portion and narrowed to a state where a plurality of continuous mountain-shaped convex portions 2 having a length are arranged, and the side wall between the convex portion 2 and the concave portion 1. A step (S2) for bringing the portion 3 into a heat-insulated state superposed on each other, a step (S3) for heat-insulating and dye-resisting the concave portion 1 by fixing the heat-insulating material 4 from the outside in a close-contact state, It consists of a step (S4) of dying and curing the convex part 2 that is immersed in a heating liquid (dyeing liquid) and touching the heating liquid, and a finishing step (S5). is there.

  There are various criteria for determining what kind of leather is suitable for three-dimensionalization, but first of all, it begins with the selection of the skin itself, such as whether to use fine calf skin or coarse adult cow skin. Therefore, it is necessary to consider the setting of the thickness according to the nature of the skin, the tanning method, and the like. In addition to cowhide, for example, natural skin such as pig skin, goat skin, sheep skin, horse skin, birds, reptiles, fish skins, and the like can be used.

  Here, for example, a combination of a plurality of tanning methods may be applied to a single skin. Specifically, both chrome tanning and tannin tanning may be mixed.

(S1: Design selection / Rough sketch)
First, before transforming into a three-dimensional shape, the design of the three-dimensional shape to be completed is determined, a sketch is applied to the leather according to the assumed design, and the position through which the thread is passed is determined. In this example, a line is written in a substantially C shape or a substantially V shape as shown in FIG. 5 along the position where the convex portion is formed by folding the mountain. In particular, the direction and length are set randomly. Then, the position 5c through which the thread is passed is set so as to pass through the zigzag so as to intersect these convex part forming lines 2a at substantially right angles. Thereby, it can narrow down more reliably and can insulate a side wall part more reliably.

  Further, the position 5c through which the thread is passed is preferably such that the thread passes at least at both ends in the length direction of each convex part or at the end parts 21 and 21 in the vicinity thereof, and more preferably at the middle part of the center part 20 or the like. Thus, the convex portion 2 can be reliably formed. Furthermore, in this example, the thread width interval is not made uniform, but sewing is performed using a plurality of different intervals. Specifically, the yarn width interval W1 when forming the convex portion 2 is set to be narrower than the yarn width interval W2 when forming the concave portion 1, and the yarns are alternately inserted at different yarn width intervals.

  As a result, as shown in FIG. 6 (b), the thread 5 is passed through a position above the intermediate position in the protruding height direction of the convex portion 2, and the convex portion 2 is formed by narrowing, which will be described later. By more accurately polymerizing, the exposed area, that is, the area dyed in contact with the dyeing solution becomes smaller, and a sharp and slender color pattern can be obtained. By appropriately setting the height at which such a thread is passed, the thickness of the pattern to be dyed can be set as desired, and the width of the design can be increased. It is also possible to make a part of a thin sharp pattern and a part a thick pattern by setting the thread width interval.

(S2: Deformation and narrowing by thread)
Next, as shown in FIGS. 6 (a) and 6 (b), the thread 5 is inserted into the zigzag while forming the mountain-shaped convex portion 2 and the concave portion 1 having a length according to the above-mentioned design sketch. An uneven three-dimensional shape is added to the surface. Specifically, a part of the leather is folded into a mountain shape having a length at the ridge line so as to form the convex portion 2, and a thread is inserted. Subsequently, the concave portion 1 is formed in the reverse direction of the leather. Fold the valley, insert the thread, repeat this until the end, and sew so that the adjacent convex parts 2 and 2 are superposed at the time of narrowing. The insertion position of the yarn is near the boundary between the dyed surface dyed in the subsequent step and the non-dyed dyed surface.

  The thread is inserted into each row using a thread for each row.For example, after inserting from one end of the leather and passing it through to the other end, it is reversed from the hole in the other row on the other end side. Multiple rows may be sewn with one thread by repeating the insertion. In this example, as shown in FIGS. 7 (a) and 8 (c), a plurality of rows of threads are passed, but it is of course possible to have only one row depending on the size and design.

As the thread and needle to be used, known ones can be used according to the kind of leather. Threads are made of natural fibers such as silk, cotton, hemp, and other natural fibers, nylon, polyester, polyacrylic, polyvinyl alcohol, polypropylene, and other synthetic fibers, semi-synthetic fibers, inorganic Yarns made of artificial fibers such as fibers, blended yarns, spun yarns, and the like can be used. In particular, when the leather is narrowed, a thread made of natural fibers is preferable because it can be tightly narrowed by shrinking when containing water.
In addition to yarn, a string or wire can be used as long as it is a linear fastening material. A string is a string of one or more of the above-mentioned yarns or a bundle of yarns, and has a diameter larger than that of the yarn. The thickness of the fastening material such as a thread, string, or wire used is preferably set to a size that does not damage the leather when inserted into the leather. It is necessary to select a fastening material such as a thread that can withstand the heat of the heating means.
As the needle, a flat needle, a twist needle, a leather needle, a reverse twist needle, a cross needle, a wedge needle, a round needle, or the like can be used.

  Next, the thread 5 extending from both ends of the leather is tied and tightened. By this narrowing, as shown in FIGS. 7 and 8, the leather is deformed into a three-dimensional shape having an uneven portion, and at the same time, the convex portions arranged in a substantially C shape or a substantially V shape (FIG. 8). (A)) are in close contact with each other in parallel (FIG. 8 (b)), and the side wall portions 3 between the convex portions 2 and the concave portions 1 are superposed on each other, so that the heating liquid does not enter even if the entire leather is immersed. It is said.

  In this example, the thermal insulation material 4 is attached to the concave side as described later in this example, so that the thermal insulation material 4 is wrapped around the material and tied together, or the thermal insulation material is tied up with another thread. Various methods are conceivable, such as a method of winding a thread passed through an end portion around a locking member and tightening leather. Also, in this example, each row is narrowed by passing it to the end with a single thread, but it is also appropriate to bind the thread only at an appropriate place in the middle or to leave it in the middle depending on the design to be processed. Can be adopted.

(S3: Dye-proofing of recesses)
Further, as shown in FIG. 9 (a), the heat insulating material 4 that comes into contact with the recess 1 from the leather back side is bound using, for example, a thread 5 different from the thread used for narrowing, and the heating liquid is attached to the recess 1. Avoid touching. Here, the leather may be narrowed by binding the heat insulating material 4, or the heat insulating material may be tied with the remaining yarn after the tightening. In addition, any means for attaching the heat insulating material can be adopted as long as the leather is not damaged.
Thus, if the heat insulating material 4 is stuck and fixed, it can insulate even a delicate uneven part, and functions also as a seal to a side wall part. The heat insulating material 4 may be any member that can be easily removed from the leather surface, and examples thereof include wood, synthetic resin members, and metal members. The metal member can prevent the recesses from being hardened by using a material having a low thermal conductivity, but even if the heat conduction is large and the recesses are hardened, the metal member can be suitably employed because it can prevent the dyeing.

(S4: Dyeing / curing)
Next, as shown in FIG. 9 (b), the squeezed leather A is immersed in the dyeing liquid 6 having a temperature for curing the leather as a heating liquid together with the heat insulating material 4, and outside without being insulated. The dye solution 6 is brought into contact with the exposed convex portion 2 to cure and dye the portion. The temperature of the dyeing solution is preferably 40 ° C. or higher, which is a temperature sufficient for the leather of the convex portion 2 to be cured, and more preferably 45 to 85 ° C. from the viewpoint of preventing deterioration of the leather.

  In this example, the side wall portion 3 polymerized by constriction and the recess 1 where the heat insulating material 4 abuts are respectively prevented from being touched by the dye solution 6 and at the same time insulated from the heat of the dye solution. Only the convex part 2 which is comprised and touches a dyeing solution will be dye | stained and hardened.

  As described above, in this example, the heat insulating material 4 is used to separate the convex portion to be cured (dyed portion) and the concave portion not to be cured (non-dyed portion), but the heat insulating material 4 is omitted as shown in FIG. Further, it is also preferable to cure not only the convex portions but also the concave portions, so that when the dye liquor 6 is used as the heating liquid, a color pattern can be formed on the front and back of the leather. In this case, with respect to the above-described thread width interval, for example, by alternately setting a row that passes through a position above the intermediate position in the protruding height direction of the convex portion 2 and a row that passes through the lower portion, that is, the concave side, It is also possible to form a sharp color pattern on the front and back of the leather, with the convex part and the concave part being positively polymerized with each other and the leather part to be cured being elongated.

  In addition, as shown in FIG. 11, the entire leather is not soaked in the dyeing solution 6 (heating liquid), but at least the convex part 2 to be heat-cured is soaked, and the concave part 1 is not soaked and goes out of the liquid. For example, it is possible to prevent thermosetting of the recess 1 while omitting the heat insulating material 4.

  In addition, a heat insulating material having a masking function that has an opening that is partially exposed and touches the heating liquid is attached so as to be in contact with the exposed surface of the narrowed leather convex portion 2, and the exposed specific portion of the convex portion 2 It is possible to dye and cure only (the part corresponding to the opening), and the heat insulation of the recess 1 can be considered in the same manner. As a result, the width of the design can be expanded and the flexibility can be increased.

  In this example, the dyeing liquid at a predetermined temperature is used as the heating liquid, and the convex portions to be cured are dyed. However, the present invention is not limited to this, and a heating liquid other than the dyeing liquid may be used and the leather is not damaged. (For example, water) is good. When a dyeing solution is used as in this example, since a part of the uneven portion of the leather that comes into contact with the dyeing solution is cured and colored, there is an advantage that heat curing and coloring can be performed simultaneously.

  In this example, since the leather is thermoset in the same process as the dyeing, the temperature and time required for dyeing and the temperature and time required for thermosetting the leather are adjusted according to the type of leather. There is a need.

(S5: Finish)
Next, the leather A is color-stopped as necessary, the yarn is unwound and washed with water, and then dried. Then, since the convex part 2 is thermosetting, the leather by which the solid shape which has an uneven | corrugated shape was hold | maintained is completed.

  Furthermore, synthetic resin, natural resin, or these resin compositions are applied to or sprayed on the outer surface of the leather that retains a three-dimensional shape by curing, or is applied only to the convex portion 2 to improve shape retention. Also preferred is a preferred embodiment. Above all, by applying an elastic synthetic resin or synthetic resin composition such as starch-based or silicone-based to the back side of the convex part of the leather to such an extent that there is no step with the surface of the concave part, irregularities rich in elasticity Since the shape can be maintained, it can be suitably used as a material for a member that frequently generates friction with a seated person such as a sofa cover.

  In this processing method, dyeing and thermosetting are simultaneously performed using a dyeing solution having a temperature sufficient for thermosetting, but thermosetting is performed with a heating liquid other than the dyeing solution, and then dyeing is performed. You can also

  Next, another example of the leather processing method according to the present invention will be described with reference to FIG.

  In this example, the leather is similarly squeezed into a three-dimensional shape having a concavo-convex portion using a linear fastening material such as a thread or string, and then heat-cured with a heater 7 instead of using a heating liquid. In the example, the cooling layer 8 is brought into contact with the concave portion 1 side, and heat is applied to the externally exposed convex portion 2 in a heat-insulated state so as not to be heated, thereby heating the convex portion 2. It is cured.

  Thereby, like the method using the heating liquid described above, only the convex portion 2 functions by heating and curing to maintain the three-dimensional shape, and at the same time, the side wall portion 3 and the concave portion 1 maintain the original flexibility of the leather, It is possible to create a three-dimensional leather that maintains stretchability. Instead of the heater, a heat plate or the like having a certain leather curing temperature may be pressed against the convex portion 2 or the like.

  Here, unlike the case where it is immersed in the whole heating liquid, a heat insulating material such as the cooling layer 8 is not necessarily required, and only the convex portion 2 can be heated with a heater while omitting this. Further, when only the convex part 2 is dyed after processing, it is possible to prevent the soaking of the dyeing liquid by adhering glue or wax to the part to be dyed, such as the concave part 1 or the side wall part and soak it in the dyeing liquid. Good.

  Next, still another example of the leather processing method according to the present invention will be described with reference to FIG.

  In this example, instead of narrowing the leather A using a thread or string as in the above example, a pair of press dies 9a having a concavo-convex shape and arranging the heating wire 10 and the refrigerant pipe 11 at appropriate portions, In this method, pressure is applied from both the front and back sides in 9b to deform the leather into a concavo-convex shape, and at the same time, at least a part of one or both of the deformed convex portion 2 and concave portion 1 is heat-cured.

For example, as shown in FIG. 13A, by disposing the heating wire 10 in the concave portions 90 and 90 of the press dies 9a and 9b corresponding to the convex portion 2 and the concave portion 1, respectively, the convex portion 2 and the concave portion 1 are formed. Cured solid leather A is obtained. Further, as shown in FIG. 13B, the three-dimensional leather A in which only the convex portion 2 is cured is obtained by providing the refrigerant pipe 11 at the concave portion 90 of the press die 9b corresponding to the concave portion 1. The press mold may be cooled or heated in advance.
These methods are different from the conventional method of maintaining the shape retention with the press pressure. Basically, the shape retention is maintained by thermosetting, so the press pressure can be small and the leather may be damaged by the pressurization. can avoid.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to such an example at all, for example, performing a thermosetting process only to some of several convex parts, or convex parts Needless to say, the present invention can be carried out in various forms within a range not departing from the gist of the present invention, such as thermosetting in a mixed state with a recess.

  The three-dimensional leather of the present invention can be used for leather products in general, for example, furniture such as sofas, chairs and cloths, interior materials for automobiles, ships and aircraft such as handles and seats, bags, bags, shoes, gloves. It can be suitably used for daily necessities such as clothing and clothing miscellaneous goods, stretchable materials such as cushion materials, and interior decoration materials. In addition, the three-dimensional leather of the present invention has little impact on the environment at the disposal stage, is moisture-absorbing, and can be made into compost soil, so that containers for plant seedlings, containers for plant cultivation, strings that bind plants, etc. It can be suitably used as a disposable material such as a heat insulating sheet for trees, a sheet for preventing diffusion of fertilizer soil at the time of planting, and a fertilized sheet. Furthermore, by combining the three-dimensional leather of the present invention with wood, glass, stone, plastic, and metal, it is possible to diversify industrial products that were difficult to produce with leather materials alone, such as automobiles, ships, It can be widely applied as parts of aircraft, machinery, electrical appliances (cell phones, personal computers, etc.).

The perspective view which shows the solid-shaped leather which concerns on typical embodiment of this invention. Similarly, a plan view of three-dimensional leather. Similarly sectional drawing. The flowchart which shows the procedure of the processing method of solid leather similarly. Explanatory drawing which shows the position which passes a thread | yarn through planar leather. (A) And (b) is explanatory drawing which shows a mode that a thread | yarn is passed. (A) is a top view which shows the state narrowed down, (b) is sectional drawing similarly. (A)-(c) is explanatory drawing which shows a mode that it is narrowed down with a thread | yarn. (A) is explanatory drawing which shows the example which attached the heat insulation raw material to the recessed part side, (b) is explanatory drawing which shows a mode that it was immersed in the dyeing liquid. Explanatory drawing which shows the modification which does not use a heat insulating material. Explanatory drawing which shows the other modification which does not use a heat insulating material similarly. Explanatory drawing which shows the modification using a heater. Explanatory drawing which shows the modification using a press die.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Concave part 2 Convex part 2a Convex part formation line 3 Side wall part 4 Heat insulation material 5 Yarn 5c Position 6 Dyeing liquid 7 Heater 8 Cooling layer 9a, 9b Press type | mold 10 Heating line 11 Refrigerant pipe | tube 20 Central part 21 End part 90 Concave position A Three-dimensional Shape leather W1, W2 Thread width interval

Claims (24)

A step of transforming a flat leather into a three-dimensional shape with an uneven portion;
A step of heating and curing at least a part of one or both of the convex portion and the concave portion constituting the uneven portion; and
And a leather processing method for retaining a three-dimensional shape by the curing.   The leather processing method of Claim 1 provided with the process of heat-insulating the remainder except the heating part of the said convex part and a recessed part.   By inserting a linear fastening material such as a thread or string into a flat leather and constricting it into a state where a plurality of continuous mountain-shaped convex portions having a length are arranged, a three-dimensional shape having the concave and convex portions is obtained. The leather processing method according to claim 1 or 2, wherein the leather is deformed.   The leather processing method according to claim 3, wherein the fastening material is passed through both ends of the convex portion in the length direction or in the vicinity thereof.   The leather processing method according to claim 3, wherein the fastening material is passed through both ends in the length direction of the convex portion, in the vicinity thereof, and in an intermediate portion.   The leather processing method according to any one of claims 3 to 5, wherein the fastening material is passed through a position above an intermediate position in the protruding height direction of the convex portion.   In any one of Claims 3-6 which narrows down to the state where the continuous mountain-shaped convex part with a length was located in a line, and made the side wall part between a convex part and a recessed part superposed | polymerized mutually. The leather processing method as described.   The leather processing method according to any one of claims 1 to 7, wherein one of the convex portion and the concave portion is thermally insulated by fixing a heat insulating material in a close contact state from the outside, and the other is heated and cured by a heating means.   The leather processing method according to claim 1, wherein a heater is used as the heating means.   The leather processing method according to any one of claims 1 to 8, wherein a heating liquid for immersing at least a heated portion is used as the heating means. By inserting a linear fastening material such as thread or string into a flat leather and constricting it into a state where a plurality of continuous mountain-shaped convex portions with a length are arranged, it is transformed into a three-dimensional shape with uneven portions And making the side wall part between the convex part and the concave part into a heat-insulated state superposed on each other,
A step of immersing the whole leather in a heating liquid and curing the convex portions and concave portions;
And a leather processing method for retaining a three-dimensional shape by the curing. By inserting a linear fastening material such as thread or string into a flat leather and constricting it into a state where a plurality of continuous mountain-shaped convex portions with a length are arranged, it is transformed into a three-dimensional shape with uneven portions And making the side wall part between the convex part and the concave part into a heat-insulated state superposed on each other,
Insulating one of the convex portion or the concave portion by fixing the heat insulating material in a close contact state from the outside,
A step of immersing the whole leather in a heating liquid and curing the other of the convex part or the concave part,
And a leather processing method for retaining a three-dimensional shape by the curing.   The leather processing method according to any one of claims 10 to 12, wherein a dyeing liquid having a predetermined temperature is used as the heating liquid.   The leather processing method according to any one of claims 1 to 13, wherein a resin or a resin composition is adhered to the outer surface of the leather that retains a three-dimensional shape by curing.   The leather processing method of any one of Claims 1-14 which has arrange | positioned the ridgeline of each convex part in the mutually parallel state.   The leather processing method according to any one of claims 1 to 15, wherein the length of the ridge line of each convex portion and the arrangement in the length direction are random in a plan view.   The pair of convex portions, which are arranged so that the ridgeline is substantially C-shaped or substantially V-shaped in a plan view, are provided at a predetermined interval in the vertical and horizontal directions. Leather processing method.   The flat leather is deformed into a three-dimensional shape having an uneven portion, and at least a part of one or both of the convex portion and the concave portion constituting the uneven portion is heated and cured, and the solid shape is formed by the curing. Three-dimensional leather characterized by being held.   19. The three-dimensional leather according to claim 18, wherein the remaining portion is insulated by excluding the heated portions of the convex portions and the concave portions, and only the heated portions are cured.   By inserting a linear fastening material such as thread or string into a flat leather and constricting it into a state where a plurality of continuous mountain-shaped convex portions with a length are arranged, it is transformed into a three-dimensional shape with uneven portions In addition, the side wall portion between the convex portion and the concave portion is in a heat insulating state obtained by polymerizing each other, the whole leather is immersed in a heating liquid to cure the convex portion and the concave portion, and the solid shape is maintained by this curing. Three-dimensional leather characterized by.   By inserting a linear fastening material such as thread or string into a flat leather and constricting it into a state where a plurality of continuous mountain-shaped convex portions with a length are arranged, it is transformed into a three-dimensional shape with uneven portions In addition, the side wall part between the convex part and the concave part is heat-insulated by polymerizing each other, and one of the convex part or the concave part is thermally insulated by fixing the heat-insulating material in close contact with the outside, and the entire leather is heated. A three-dimensional leather characterized by being immersed in a liquid to cure the other of the convex portion or the concave portion and retaining the three-dimensional shape by this curing.   The solid leather according to any one of claims 18 to 21, wherein ridge lines of the respective convex portions are arranged in parallel to each other.   The three-dimensional leather according to any one of claims 18 to 22, wherein the length of the ridge line of each convex portion and the arrangement in the length direction are random to each other in plan view. 24. The method according to any one of claims 18 to 23, wherein a plurality of a pair of convex portions arranged so that the ridgeline is substantially in the shape of a letter C or a letter V in plan view are provided at predetermined intervals in the vertical and horizontal directions. The three-dimensional leather described.

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