JP6450270B2 - Protective material made of foamed resin, manufacturing method thereof and protecting method - Google Patents

Description

  The present invention relates to a protective material formed of a foamed resin useful for protecting a protected material in various fields such as construction materials and furniture, a manufacturing method thereof, and a protective method.

  In a wide range of fields such as construction materials, furniture, and home appliances, protective materials have been used to prevent damage and breakage. For example, at construction sites, protective materials such as curing covers are used to prevent construction materials such as pillars from being damaged or contaminated, or to prevent workers from being injured by construction materials. . Among these protective materials, protective materials made of foamed resin with high shock absorption are widely used.

  For example, Japanese Patent Laid-Open No. 2000-170383 (Patent Document 1) discloses a front surface protection portion that is formed of a thermoplastic resin foam and protects the front surface portion of the material to be protected, and a curve that curves from both ends of the front surface protection portion. And a protective material in the shape of a flat tube having a continuous crack in the longitudinal direction. In the cross section with respect to the longitudinal direction, the protective material has both side edges of the protective material forming the cracks overlapping each other, and does not require a wide storage space, thereby reducing physical distribution costs and storage space. This document also describes a protective material having a locking portion having bulges on both side edges forming a crack of the protective material. In this protective material, when covering the entire circumference of the pillar or the like, the locking portions can be engaged and firmly coupled to each other, and when protecting the pillar such as H-shaped steel, the locking portion is attached to the flange of the H-shaped steel or the like. The material to be protected can be protected by engagement.

  Japanese Patent Laid-Open No. 2000-303698 (Patent Document 2) is formed of a foamed resin molded body, protects the front surface portion of the protected material, a curved portion that curves from the front surface protection portion, A flat cylindrical protective material provided with a hug piece extended from a curved portion is described. This protective material has a thick rib portion and a thin long groove along the longitudinal direction at both ends of the holding piece. For this reason, the rib portion is easily hooked and easily opened in the lateral direction, so that it is easy to attach to the protected material.

  These protective materials fasten the material to be protected by the reaction force resulting from the shape restoring force of the curved portion of the flat cylindrical shape. Can be protected. However, when applied to a material with a relatively wide width, the curved portion comes into contact with both corners on the front side of the material to be protected, so that both sides of the material to be protected cannot be sufficiently clamped, and can easily be removed from the material to be protected. I will release. Therefore, the protected material which can be protected is limited. Moreover, since the shape of the said front surface protection part will change notably when these curved parts open the said curved part largely, these protective materials will often fall in the adhesiveness with respect to a to-be-protected material.

  Japanese Patent No. 3231025 (Patent Document 3) describes a protective material having a substantially flat cylindrical shape which is formed of a resin foam and includes a portion partially cut off in the longitudinal direction. The protective material includes a front surface protection portion, bent portions positioned at both ends of the front surface protection portion, and sandwiching portions that are continuous with the bent portions, respectively, and the front surface protection portion is formed in a substantially wave shape, The portion extends while being curved, and the tip thereof forms a bent end toward the front protection portion. In this protective material, when both sides of the protected material are clamped to protect the front surface of the protected material, even if both corners on the front side of the protected material are in contact with the clamping portion, the clamping portion is a curved portion. A certain tightening force can be applied. However, since the tip of the bent end (clamping portion) has a tapered shape, and the tip is bent in the direction of the front protective portion, when the width of the protected material increases, both side portions of the protected material The clamping force with respect to is significantly reduced, and is easily detached from the protected material. This document also describes a protective material in which the sandwiching portion extends into a curved wave shape (wave shape) including a curved portion curved inward, and a tip thereof forms a bent end toward the front protective portion. ing. However, even in this protective material, the tip of the bent end has a tapered shape, and the sandwiching portion includes a curved portion curved inward, so that when the width of the protected material is increased, the curved portion becomes a portion of the protected material. Since it abuts (or comes into contact) with the front surface portion, it is easily detached from the protected material.

JP 2000-170383 A (claims, paragraphs [0004] and [0036], FIG. 1) JP 2000-303698 A (claims, paragraphs [0015] [0020], FIGS. 1 and 4) Patent No. 3231025 (Claims, Examples, Paragraphs [0011], [0054], FIG. 2, FIG. 5, FIG. 6)

  Therefore, an object of the present invention is to provide a protective material useful for protecting a material to be protected by providing a wide range of application of the material to be protected and holding it with a high tightening force, and a manufacturing method and a protection method thereof. There is.

  Another object of the present invention is to provide a protective material that can reliably and effectively protect the material to be protected even if the width of the material to be protected is large, a method for manufacturing the same, and a protection method.

  Still another object of the present invention is to provide a protective material that is excellent in adhesion to the material to be protected and that can prevent detachment from the material to be protected, a method for producing the same, and a protective method.

  As a result of intensive studies to achieve the above-mentioned problems, the present inventors have found that when the action part of the clamping part on which the tightening force acts on the protected material is located on the inner side of the base part or base inner wall of the clamping part, the action part Can be engaged with a corner or a side wall (corner side wall) of the material to be protected and can be sandwiched with a high clamping force, and the sandwiching part is inclined to the inside (or the curved part) toward the tip part, and / or If it has a protruding part that protrudes or bulges inward (or on the curved part side), it securely engages the corner or side wall (or corner side wall) of the protected material, and the width of the protected material is large. Can be effectively protected, and when the action site is located on the line from the opening / closing base point of the clamping part to the front protection part or on the inner side (or in the side direction) from this line, the tightening force can be increased, and the front protection If the part is formed in a convex shape, the protected material Excellent adhesiveness against, found that can prevent desorption from the protective material, thereby completing the present invention.

  That is, the protective material of the present invention is formed of a foamed resin composition, protects at least the front surface portion of the material to be protected, a front surface protection portion, a curved portion curved in the side direction from both ends of the front surface protection portion, An extending portion that extends in a direction approaching each other from the curved portion and is separated from each other (for example, at an interval), and a sandwiching portion that is bent or curved inward with respect to the extending portion. The clamping part has an action part (or an action part that can be engaged with the protected material) on which a clamping force acts on the protected material, and the action part is located on the inner side of the base part or the base inner wall of the clamping part. positioned. The said clamping part may be provided with the inclination part which spreads inward toward the front-end | tip part, and / or the protrusion part which protruded or bulged inside. The inclined portion and / or the protruding portion may form an engaging portion that can be engaged with the material to be protected.

  The angle (inner angle) α between the extension part and the clamping part may be about 30 to 130 ° (for example, 40 to 90 °). The extension portion is upward or downward at an angle β of about −60 to 60 ° (for example, −50 to 50 °) with respect to the horizontal plane in a state where the front protection portion is placed on the horizontal plane with the front protection portion facing upward. You may extend linearly or non-linearly (for example, curved shape curved outward) toward the direction. Moreover, the said extension part may incline toward the downward direction with respect to a horizontal surface, for example.

  The action part of the clamping unit may be located on a line from the opening / closing base point of the clamping unit toward the front protection unit or on the inner side of this line (or in the side part direction with respect to the direction toward the front protection unit). Further, the thickness h1 of the extension part and the length h2 of the clamping part may satisfy a relationship of h1 ≦ h2 (for example, h1 ≦ h2 ≦ 3 × h1). Furthermore, the radius of curvature r of the inner wall of the curved portion may be 25 mm or less (for example, about 5 mm to 15 mm).

  In addition, the shape of the front protective part includes a curved or flat front protective part body gently curved outward, and curved parts curved inward (or inward) from both ends of the front protective part main body. It may be formed in a convex shape or a mountain shape. Furthermore, the foamed resin composition may contain an olefin resin.

  The present invention also includes a method for protecting the material to be protected by locking (or engaging) the material with the material to be protected. In this method, the protection material can be protected by opening the clamping portion of the protection material and positioning the clamping portion on the side wall or corner of the protection material.

  Furthermore, this invention also includes the method of manufacturing the said protective material by extrusion molding. In this method, a molten resin composition containing a foaming component is extruded from a die of a mold, and is molded into the shape of the protective material by a sizing die to manufacture the protective material.

  In the present specification, the term “free” for the extending portion means that the outer walls of the distal end portion of the extending portion are located apart from each other, and the outer wall of the distal end portion of the extending portion is the clamping portion. As long as they can be separated from each other in the opening operation, the meaning that they may be in contact with each other (physical contact) is also included.

  In the protective material of the present invention, since the action part of the clamping part with respect to the protected material is located on the inner side (or the curved part side) of the base part of the clamping part or the inner wall of the base part, the clamping part is a corner part of the protected material. Alternatively, the side wall (or the corner side wall) can be clamped with a high tightening force, and the application width of the protected material can be expanded. Further, when the sandwiching portion includes the predetermined inclined portion and / or the protruding portion, it can be reliably engaged with the corner portion or the side wall (or the corner side wall) of the material to be protected, so that detachment can be effectively prevented. In addition, a high tightening force can be applied by bringing the acting portion of the protruding portion (or sandwiching portion) into contact with the corner or side wall of the protected material in a linear or small area, and a wide protected material can be reliably and Can be protected effectively. Further, when the action part of the clamping part with respect to the protected material is located on the line from the opening / closing base point of the clamping part toward the front protective part or deviated in the side part direction (or inward) from this line, the clamping to the protected material You can improve your power. Furthermore, when the thickness of the extending portion and the length of the sandwiching portion satisfy a predetermined relationship, the shape restoring force of the sandwiching portion can also be used as the tightening force (reaction force), and the tightening force on the protected material can be improved. Furthermore, when the front surface protection portion is formed in the convex shape, the adhesiveness with the material to be protected is excellent, so that detachment from the material to be protected can be prevented. Such a protective material is highly useful because it can sufficiently protect a plurality of protected materials having different widths.

FIG. 1 is a schematic perspective view showing an example of the protective material of the present invention. FIG. 2 is a schematic cross-sectional view of the protective material of FIG. FIG. 3 is a schematic enlarged cross-sectional view showing the relationship between the curved portion, the extending portion, and the sandwiching portion of the protective material in FIG. 1 and the horizontal plane passing through the second base point of the extending portion. FIG. 4 is a schematic enlarged cross-sectional view showing the relationship between the curved portion, the extending portion, and the sandwiching portion of the protective material in FIG. 1 and the horizontal plane passing through the third base point of the extending portion. FIG. 5 is a schematic cross-sectional view showing a state where the material to be protected is protected by the protective material of FIG. FIG. 6 is a schematic cross-sectional view showing a state in which another protected material having a different width is protected by the protective material of FIG. FIG. 7 is a schematic cross-sectional view showing another example of the protective material of the present invention. FIG. 8 is a schematic enlarged cross-sectional view showing the relationship between the curved portion, the extending portion, and the sandwiching portion of the protective material in FIG. 7 and the horizontal plane passing through the second base point of the extending portion. FIG. 9 is a schematic enlarged cross-sectional view showing the relationship between the curved portion, the extending portion, and the sandwiching portion of the protective material in FIG. 7 and the horizontal plane passing through the third base point of the extending portion. FIG. 10 is a schematic cross-sectional view showing still another example of the protective material of the present invention. FIG. 11 is a schematic cross-sectional view showing a state in which the material to be protected is protected by the protective material of FIG. FIG. 12 is a schematic cross-sectional view showing another example of the protective material of the present invention. FIG. 13 is a schematic cross-sectional view showing still another example of the protective material of the present invention. FIG. 14 is a schematic enlarged cross-sectional view showing the relationship between the curved portion, the extending portion, and the sandwiching portion of the protective material in FIG. 13 and the horizontal plane passing through the third base point. FIG. 15 is a schematic cross-sectional view showing another example of the protective material of the present invention, and the relationship between a curved portion, an extending portion, and a sandwiching portion of the protective material, and a horizontal plane passing through the third base point.

  Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

[Protective layer]
The protective material 1 shown in FIGS. 1 to 3 is formed of a foamed resin composition, and includes a front protective part 2 for protecting at least the front part of the material to be protected, and both sides of the front protective part 2 in the lateral direction. A bending portion 3 that bends at a predetermined degree of bending; an extension portion 4 that extends to the bending portion 3 and extends in a direction approaching each other and gently (curving outward); and the extension portion 4 A clamping part 5 bent inward at an angle α of about 30 to 90 ° with respect to the extension part 4, and a protruding part 6 (or engagement part) formed at the tip of the clamping part 5. I have. The extension parts 4 face each other at a predetermined interval to form a slit-like part.

  The cross-sectional shape of the protective material 1 is a substantially flat cylindrical shape, and is bilaterally symmetric about a central portion in the horizontal direction. In this example, the ratio (W / H) of the width W to the height H of the protective material 1 is about 2.0 to 3.5, is easy to handle, and has high adhesion to the protected material.

  Moreover, the thickness of each part (a front surface protection part, a curved part, an extension part, and a clamping part) which forms the protective material 1 is about 5 to 20 mm so that both shock absorption and flexibility can be achieved.

  The front protection part 2 is gently outward (or outward) so that the adhesion between the front protection part 2 of the protective material 1 and the front part of the protected material is not impaired even if the clamping part 5 is opened wide. ) And a curved portion 22 that gently curves inward (or inward) from both ends of the front protective body. This convex front protective part 2 can suppress expansion and contraction in the lateral direction (or the curved part direction) as compared with a continuous wave (or wave-shaped) front protective part, and is particularly suitable for a relatively wide protected material. When applied, the tightening force resulting from the shape restoring force of the curved portion (or extending portion) can be improved.

  The inner wall of the bending portion 3 is curved with a relatively small degree of curvature. That is, the radius of curvature r of the inner wall of the curved portion 3 is about 5 to 15 mm. Therefore, the shape restoring force of the bending portion 3 is large, and the tightening force can be improved. The radius of curvature can be the radius of the inscribed circle having the largest diameter among the inscribed circles of the inner wall of the curved portion. In addition, when the inner wall of the curved portion is not smooth and includes minute unevenness (for example, unevenness of 3 mm or less), for example, using the least square method or the like, smoothing is performed along the inner wall of the bending portion. An approximate line (or approximate curve) may be calculated to obtain the radius of curvature.

  The extension part 4 is gently curved outward (or outward) from the curved part 3 in the upward direction (inward direction) and inclined. That is, when the protective material 1 is placed on the horizontal surface with the slit-shaped portion facing down (or the front surface protection portion facing up), the extending portion 4 is upward at an angle β of about 3 to 30 ° with respect to the horizontal surface. It is inclined in the direction (the back side of the front protection part). The angle β can be determined on the basis of the base point of the extension part 4, and the base point of the extension part 4 is an action site where stress acts on the inner wall of the extension part 4 in the opening operation of the extension part 4. It can be. As shown in FIG. 3, the stress application site (the base point of the extension portion) is the inner wall portion 80 (extension of the extension portion 4 corresponding to the contact point between the outer wall of the extension portion 4 and the horizontal plane 7. 4, the intersection 80 between the perpendicular line passing through the contact point 8 between the outer wall of the projecting portion 4 and the horizontal plane 7 and the inner wall of the extending portion 4, referred to as a second base point), and as shown in FIG. When the line (or curve) along the inner wall of the extension part 4 is differentiated from the deepest part 15 (or the point located in the outermost direction) in the side direction of the inner wall of the bending part 3 toward the extension part. , The point at which the change rate of the differential value (or the slope of the tangent) first changes (or changes) (referred to as the transition point 13 or the third base point). The former is applicable to the case where the extension part extends upward or horizontally in order to determine the base point of the extension part based on the contact point between the outer wall of the extension part and the horizontal plane. Since the point (transition point) at which the curvature (or curvature) of the line (or curve) along the inner wall of the part and the extension part changes is the base point of the extension part, it is limited to the extension direction of the extension part. It can be applied. If the angle β based on the former (second base point) is the angle β1, and the angle β based on the latter (third base point) is the angle β2, the angle β1 is about 5 to 30 ° and the angle β2 May be about 3 to 25 °. Specifically, as shown in FIG. 3, when the extending part is non-linear (for example, curved) like the protective material 1, the angle β1 is set to the horizontal plane 70 and the extending part 4. A straight line 10 (second point) connecting the intersection 80 (the base point of the extension part, the second base point) with the inner wall of the lowermost part of the pin and the bending point 9 (referred to as the first base point) that is the base point of the bending part 5 And the horizontal plane 70). That is, the intersection 80 [or the intersection 80 between the horizontal plane 70 obtained by shifting the horizontal plane 7 upward by the thickness of the extension 4 and the inner wall of the extension 4 (or the contact point 8 with the horizontal plane 7 on the horizontal plane 7). On the other hand, a line 10 (second reference line) connecting the bent point 9 and the horizontal plane 70 is a point that contacts the inner wall of the extension portion when shifted vertically in the inward direction)] It can be an angle.

  Further, as shown in FIG. 4, the angle β <b> 2 is a straight line 14 (third reference line) connecting the third base point 13 (transition point 13) and the bending point 9 (first base point 9). The angle with the horizontal plane 71 (or horizontal plane 7) passing through the third base point 13 can be set. Furthermore, from the third base point 13 (transition point), the side portion side can be a curved portion and the slit-like portion side can be an extended portion. Thus, since the extension part 4 is inclined inward (upward) at an angle β (angle β1 or β2), the extension part 4 can also exert a shape restoring force and improve the tightening force. it can. In addition, when the inner wall of the curved part and / or the extended part includes minute unevenness (for example, unevenness of 3 mm or less), the inner wall of the curved part and the extended part is along the same as the radius of curvature. The transition point (third base point) can be obtained using an approximate line (or approximate curve) or the like.

  The projecting portion 6 (or engaging portion) of the sandwiching portion 5 is made to contact the corner or side wall of the material to be protected with the working portion of the projecting portion 6 in a reliable manner so that a clamping force is applied. It is formed to bulge inside the tip. Moreover, this protrusion part 6 has a small contact area of the action site | part (or action site | part which contacts a to-be-protected material) with respect to a to-be-protected material, and can make clamping force large. Since the angle α (angles α1, α2) is adjusted to a relatively small angle (about 40 to 90 °), the protrusion 6 is effectively engaged (or engaged) with the corner or wall of the protected material. And the shape restoring force of the clamping part 5 is also effectively applied, and the corner or side wall (or the corner side wall) of the material to be protected can be clamped with a high clamping force. Similarly to the angle β, the angle α can be determined based on the base point of the extending portion. That is, if the angle α1 when the second base point is the reference is the angle α1 (FIG. 3), and the angle α when the third base point is the reference is the angle α2 (FIG. 4), the angle α1 is 40. About 90 ° and angle α2 may be about 30-80 °. Specifically, as shown in FIG. 3, the angle α <b> 1 includes the second reference line (straight line 10), the action site of the protrusion 6, and the bending point 9 (first base point). It can be an internal angle formed by the connecting straight line 11 (referred to as a first reference line). Further, as shown in FIG. 4, the angle α2 can be an internal angle formed by the third reference line (straight line 14) and the first reference line (straight line 11).

  The first base point means a point (base point) that becomes a starting point of opening and closing when a force is applied to the action site and an operation of opening and closing the clamping part (or engaging part) is performed. That is, when a force is applied in the direction in which the clamping part 5 is opened from the action part of the projecting part 6, the clamping part 5 is opened around the bending point 9 (base point), and when the force is released, the bending point 9 is centered (base point). The clamping part 5 is closed. In such an opening / closing operation, the bending point 9 serving as the center (base point) can be used as the first base point (base point for opening / closing the clamping portion). In addition, the first base point can be a breaking point in the opening / closing operation. The base portion of the sandwiching portion is the first base point (the intersection of the extension line between the inner wall of the extension portion and the inner wall of the sandwiching portion, the intersection of the first reference line and the second or third reference line, or Corresponding to the pinching point of the clamping part) and can be a boundary area between the extension part and the clamping part extending from the extension part. The base inner wall may be an inner wall of the base or an inner wall near (or adjacent to) the base (or adjacent to the base). For example, in the protective material 1 shown in FIG. 3, the base inner wall corresponds to the inner wall of the non-projecting portion (the portion without the projecting portion 6). Therefore, in the protective material 1, the action part of the protrusion part 6 is located inside the base inner wall, and can be clamped with a high tightening force even if the width of the protected material is wide.

  Further, in the protective material 1, the angle β (angle β1 or β2) and the angle α (or angle α1 or α2) are adjusted to a predetermined angle, and the action site of the protruding portion 6 is changed from the first base point to the front protective portion. 2 is located inwardly with respect to the line toward 2 [or to the side direction (the direction of the curved portion 3) with respect to the direction toward the front protective portion 2]. That is, a straight line 12 (referred to as a fourth reference line) that is perpendicular to the horizontal plane 7 (or the horizontal planes 70 and 71) and that is in contact with the outer wall of the distal end portion of the extending portion 4, and the first The angle γ (inner angle) formed by the reference line 11 is about 20 to 70 °. In addition, when the protective material 1 is placed on a horizontal plane, among the perpendiculars to the horizontal plane, a perpendicular passing through the first base point can be a line from the first base point toward the front protective part, and the perpendicular is The direction which goes to can be made into the direction which goes to a front surface protection part (hereinafter the same). Further, when the angle γ> 0 °, the action portion of the clamping portion is located on the inner side (the curved portion side, the side in contact with the protected material) than the base portion.

  In addition, in order that the protruding portion 6 can form a contact point (action point) at an appropriate position with the wall portion of the material to be protected and can be clamped with a sufficient tightening force, the thickness h1 of the extension portion and the clamping portion The length h2 satisfies the relationship of h1 ≦ h2 ≦ 3 × h1. In addition, the length h2 of the clamping part 5 can be made into the length from the action site | part of the said protrusion part 6 to the said bending point 9 (1st base point) in the 1st reference line (the said straight line 11). Moreover, when the thickness of the extension part 4 differs, the thickness h1 of the extension part 4 can be made into the average thickness of the extension part 4. FIG.

  In such a protective material 1, the action part of the protrusion 6 is located inside the base inner wall of the holding part, the angle γ is adjusted to a predetermined angle, and the action part is more than the base part of the holding part. It is located on the inner side, that is, on the inner side of the direction toward the front protective part (biased toward the curved part 3). Therefore, compared with the protective material in which the action part is located on the line toward the front protective part (angle γ is 0 °) or in the direction of the slit-like part (angle γ <0 °) than the line toward the front protective part A high tightening force can be applied to the wall portion of the material to be protected from the action portion of the portion 6, and even if the width of the material to be protected is widened, the protruding portion 6 is engaged with the corner (or the corner side wall) of the material to be protected. And the protected material can be reliably protected. Furthermore, since the thickness h1 of the extending part 4 and the length h2 of the clamping part 5 satisfy a predetermined relationship, a reaction force (clamping force) resulting from the shape restoring force of the clamping part 5 can be effectively applied, and the protected material Can be prevented from being detached.

  Note that the angle γ may be the same or different between the left and right holding portions, and at least one of the holding portions only needs to satisfy the angle γ ≧ 0 °.

[Protection method]
The protective material 1 has a curvature radius r, an angle β (angle β1 or β2), an angle α (angle α1 or α2), a relationship between h1 and h2 is adjusted to a predetermined range, and includes the protrusion 6. It can also be applied to a wide range of protected materials.

  FIG. 5 is a schematic cross-sectional view showing a state in which the protective material 1 is applied to a relatively wide protected material. In this method, when the sandwiching portion 5 of the protective material 1 is opened and the sandwiching portion 5 is positioned on the side wall of the protected material 101, the action site of the protruding portion 6 acts on a predetermined site on the side wall of the protected material 101, The protected material 101 can be held. That is, even if the extended portion 4 (or the curved portion 3) of the protective material 1 contacts the corner portion of the protected material 101, the protruding portion 6 is caused by the shape restoring force of the curved portion 3 and the extended portion 4. Can act with a sufficient tightening force, because the acting portion acts on the side wall of the protected material 101 with a high tightening force. Furthermore, since the front surface part of the protected material 101 and the front surface protective part 2 of the protective material 1 are in contact with each other, the adhesion is not impaired and it is difficult to detach.

  FIG. 6 is a schematic cross-sectional view showing a state in which the protective material 1 is applied to the protected material 102 having a width larger than that of the protected material 101. When the holding part 5 of the protective material 1 is opened widely and this holding part 5 is hooked on the corner of the protected material 102, the working part of the protrusion 6 is surely attached to the corner (or the corner side wall) of the protected material 102. Since the engaging force and the shape restoring force of the clamping part 5 act, it can be protected with a sufficient tightening force. Furthermore, since it is excellent in adhesiveness, desorption can be prevented.

  In this way, the protective material of the present invention can be held and protected with a sufficient tightening force even for a wide material to be protected that cannot be applied with conventional protective materials. Therefore, it can be applied to a plurality of protected materials having different widths.

[Other examples of protective material]
7 to 9 are a schematic sectional view and a schematic enlarged sectional view showing another example of the protective material of the present invention.

  In the protective material 1a of this example, the extended portion 4a is greatly curved outward (outward) from the curved portion 3a and inclined upward (inward), and the clamping portion 5a is curved in the extended portion 4a. Thus, a protruding portion 6a bulging inside the tip of the sandwiching portion 5a is provided. An angle α (inner angle) formed by the extending portion 4a and the sandwiching portion 5a is about 30 to 90 °. That is, when the protective material 1a is placed on the horizontal plane 7a, the extending portion 4a is inclined upward (backward direction of the front protective portion) at an angle β of about 20 to 50 ° with respect to the horizontal plane. Specifically, as shown in FIG. 8, the extending portion 4 a includes a first base point 9 a (a base point for opening and closing the sandwiching portion) and an intersection 80 a (second base point, a base point of the extending portion). ) With respect to the horizontal plane 70a passing through the intersection 80a (second base point) from the intersection 80a toward the sandwiching portion at an angle β1 of about 30 to 50 °, with reference to the straight line 10a (second reference line) The holding part 5a is inclined at an angle α1 of about 40 to 90 ° with respect to the second reference line 10a. As shown in FIG. 9, the extension 4a is based on a straight line 14a (third reference line 14a) that connects the first base point 9a and the transition point 13a (third base point) of the extension. As described above, the horizontal plane 71a passing through the transition point 13a (third base point) is inclined upward from the transition point 13a toward the clamping part at an angle β2 of about 20 to 40 °, and the clamping part 5a is Is bent at an angle α2 (inner angle) of about 30 to 80 ° with respect to the reference line 14a. That is, since the angle β is large, the working part of the protective material 1a has a large angle position of about 40 to 110 °, that is, the working part of the protruding portion 6a is more than the protective material 1 (FIGS. 3 and 4). Is also located in the inner direction (curved portion direction). Therefore, the tightening force can be improved, and the detachment from the protected material can be prevented. As shown in FIGS. 8 and 9, even in such a case, the first base point 9a is a point that becomes a base point (a base point for opening and closing the clamping unit) in the opening and closing operation of the clamping unit 5a. This means that the angle α1 or α2, the angle β1 or β2, and the angle γ can be determined in the same manner as the protective material 1.

  The protective material 1a can hold the protected materials 101 and 102 with a sufficient tightening force by the same method as the protective material 1.

  FIG. 10 is a schematic cross-sectional view showing still another example of the protective material of the present invention.

  In the protective material 1b of this example, the shape of the front protective part 2b is the same as that shown in FIG. 1 except that the central part of the front protective part main body 21 of the protective material 1 is curved and recessed inward. Same as material 1. That is, since the front protective part 2b has a concave central part [having a concave part (or valley) in the central part], the elongation rate in the horizontal axis direction of the protective material 1b can be improved, and the applicable width of the protected material can be increased. It can be further expanded.

  FIG. 11 is a schematic cross-sectional view showing a state in which the protective material 1b is applied to a protected material wider than the protected material 102. When the holding part 5 of the protective material 1 b is opened widely, the front protective part 2 b is extended in the horizontal axis direction, and the holding part 5 is hooked on the corner of the protected material 103, the action site of the protruding part 6 becomes the protected material 103. Since the shape restoring force of the sandwiching part 5 acts reliably and the shape restoring force of the front protective part 2b formed in a continuous wave shape acts, It can be protected with sufficient tightening force. Furthermore, since the front surface portion of the protected material 103 and the front surface protection portion 2b of the protective material 1b form a plurality of contact portions, it has excellent adhesion and can prevent detachment.

  FIG. 12 is a schematic cross-sectional view showing another example of the protective material of the present invention. Except for the shape of the front protective part, it is the same as the protective material 1 shown in FIG. 1, and the form of the front protective part 2c is a gentle (large curvature radius) arc. The protective material 1c of this example can also hold and protect the protected material with a sufficient tightening force by the holding portion 5.

  Further, as shown in FIGS. 3 and 8, the extending portion may be inclined upward with respect to the horizontal plane, and is inclined downward as shown in FIGS. 13, 14, and 15. May be. In addition, when the extension part is inclined downward, the angle α (angle α2) of the holding part and the angle β of the extension part with the third base point (transition point) as the base point of the extension part. (Angle β2) can be obtained.

  13 and 14 are a schematic sectional view and a schematic enlarged sectional view showing still another example of the protective material of the present invention. In the protective material 1d of this example, the extending portion 4d is gently curved (curved outward), and is inclined downward at an angle β of about −30 to −5 ° with respect to the horizontal plane. 4d is provided with a protruding portion 6d that is bent inwardly at an angle α of about 40 to 90 ° and is bulged inward (or on the curved portion side) of the front end portion of the holding portion 5d. That is, the extending portion 4d has the third base point with reference to a straight line 14d (third reference line) connecting the third base point 13d (transition point 13d) and the first base point 9d (bending point 9d). It is inclined at an angle β2 of about −30 to −5 ° with respect to a horizontal plane 71d passing through 13d. Therefore, the shape restoring force due to the curved portion and the extending portion can be relaxed (or reduced), the sandwiching portion 5d can be easily opened, and the attachment property to the protected material can be improved. On the other hand, the protective material 1d has an action part of the protrusion 6d at a position where the angle α2 with respect to the third reference line is adjusted to about 40 to 90 ° and the angle γ is about 5 to 40 °. Yes. Therefore, even if the width of the material to be protected is large, the protrusion 6d can be engaged with the corner (or the side wall of the corner) of the material to be protected, and the shape restoring force of the clamping portion is applied to tighten the material to be protected. be able to. That is, the protective material 1d is adjusted by combining a negative angle β (angle β2 <0 °), a positive angle γ (angle γ> 0 °), and a predetermined angle α (angle α2). It is possible to achieve both wearability and tightening force.

  Furthermore, the protective material 1d has a first base point (a base point for opening and closing the clamping portion) located on the lower side as compared with the protective material in which the extended portion 4d is inclined upward (angle β> 0). The front protective part can be flattened with the opening operation of the clamping part 5d. Therefore, the adhesion to the material to be protected can be improved, and detachment from the material to be protected can be further prevented. Thus, since the protective material 1d can reduce the stress acting on the front surface protective portion 2, the front surface protective portion 2d has a flat, convex, corrugated (or continuous wave shape), and gentle curve with a low height. You may form in a shape (for example, circular arc shape).

  Therefore, the protective material 1d can be easily and easily attached to a wide protected material (for example, the protected material 102 shown in FIG. 6) and has high adhesion, so that it can be removed from the protected material. Separation can be effectively prevented.

  The angle α2, the angle β2, and the angle γ can be determined by the same method as that for the protective material 1. Further, also in the protective material 1d, the protected materials 101 and 102 can be clamped with a relatively high tightening force by the same method as the protective material 1 shown in FIG.

  FIG. 15 is a schematic cross-sectional view illustrating another example in which the extending portion is inclined downward. The protective material 1e of this example has a form in which the inclination angle of the extending portion is larger (negatively larger) than the protective material 1d, that is, the extending portion 4e is about −60 to −30 ° with respect to the horizontal surface 71e. It is a form inclined downward at an angle β2. For this reason, it is possible to improve the mountability and adhesion to the protected material. On the other hand, this protective material 1e has a working portion at a relatively small angle γ (not shown), that is, at an angle γ of about 0 °, but the protruding portion 6e (or Engaging portion), the working part of the projecting portion 6e is located on the inner side of the inner wall of the base portion of the sandwiching portion, and the angle α is adjusted to about 30 to 90 °. Even if it is large, it can be reliably engaged with the wall portion of the material to be protected, and the side wall of the material to be protected can be tightened by effectively acting the shape restoring force of the clamping portion 5e. Therefore, it is possible to achieve both mounting properties and tightening force, and it can be applied to a wide protected material.

  The extending portion may extend in a horizontal direction (or parallel to a horizontal plane) in a linear shape or a non-linear shape (for example, a wave shape). For example, when the extending portion extends linearly in the horizontal direction, the second reference line is parallel to the horizontal plane [angle β (angle β1) = 0 °]. In addition, when it has a contact point on the slit-like part side from the first base point, the second reference line (on the basis of the contact point located on the curved part side (side part side) from the first base point A straight line parallel to the horizontal plane) is obtained, and the angle β (angle β1) can be calculated. Since the third base point (transition point) may change depending on the shape of the curved portion, the third reference line may not be parallel to the horizontal plane [angle β (angle β2) = 0 °]. . Such a protective material in which the extending portion extends in the horizontal direction (for example, a protective material extending in a straight line in the horizontal direction) effectively applies the shape restoring force of both the sandwiching portion and the bending portion. Since the corners (or corner side walls) of the protected material can be tightened by the sandwiching portions, the protected material can be effectively protected even if the width of the protected material is large. In addition, the angle β is small as compared with the protective material in which the extending portion is inclined upward, so that the mounting property to the protected material can be improved, and the adhesion of the front protective portion to the protected material can also be improved.

  In the protective material of the present invention, the cross-sectional shape of the protective material is usually a substantially flat cylindrical shape, but may be a non-flat cylindrical shape. The ratio of the width W to the height H of the protective material is, for example, 1.0 to 4.0 (for example, 1.5 to 4.0), preferably 2.0 to 3.5, and more preferably 2. It may be about 5 to 3.0. If this ratio is too large, the handleability may be reduced, and if it is too small, the adhesion and the fastening force may be reduced. In addition, although the cross-sectional shape of a protective material may differ in right and left centering on the center part of the horizontal direction of a front surface protection part, it is usually left-right symmetric. The length of the protective material may be a length that can protect the material to be protected, and may be short or long.

  Moreover, the thickness of each part (a front surface protection part, a curved part, an extension part, and a clamping part) which forms a protective material can be selected from the range of about 3-30 mm, for example, Preferably it is 5-20 mm, More preferably, it is 7- It may be about 15 mm. If the thickness of the protective material is too thin, the impact absorbability and the tightening force are reduced, and if it is too thick, the flexibility may be impaired.

  The front protection part is formed of a front protection part main body having a flat shape or a curved shape and a main body side part (for example, a bending part) connected to both ends of the front protection part main body (for example, FIG. 7 and FIG. 13), a form formed only by the front surface protection unit main body (for example, an arc shape as shown in FIG. 12), and other curved shapes, It may be linear. In addition, when it is the said convex shape, you may form multiple recessed parts (or trough parts) as shown in FIG. 10 in a front surface protection part main body. When the front surface protection unit main body includes a plurality of recesses (or valleys), the stretchability of the protected material in the horizontal axis direction can be improved, and the protected material having various widths can be handled. Conversely, if the number of recesses in the front protective body is reduced, the stretchability of the protected material in the horizontal axis direction can be reduced, and in particular, the protected material having a relatively wide width (for example, the front protective portion extends in the lateral direction). When applied to a material to be protected (size), the tightening force (or bending stress of the bending portion) due to the shape restoring force of the bending portion (or extension portion) may be improved. Therefore, as shown in FIGS. 2, 7, 13, and 15, the front surface protection portion may have a convex shape or a mountain shape that does not include a concave portion (or valley portion), or a curved shape (for example, an arc shape). ) Or a flat shape. In particular, as shown in FIGS. 2, 7, 13, and 15, the front protection body formed in a curved shape (or a curve that is relatively flat), and curved inward from both ends of the front protection body. When combined with the curved part, the curved part can suppress the deformation of the front protective part main body accompanying the opening operation of the clamping part, and the front protective part main body is formed relatively flat. Adhesion to the front surface can be improved. Further, the height of the front surface protection portion may be appropriately selected depending on the extending direction of the extending portion (for example, angle β). For example, the extending portion extends upward (angle β> 0). °) When the angle β increases, the stress acting on the front protection part often increases with the opening operation of the clamping part. Therefore, the height of the front protection part is increased (or thickened). If the extension part extends downward (angle β <0 °), the stress acting on the front protection part often decreases (or decreases) as the angle β decreases. The height of the front protective part may be lowered (or thinned).

  Each curved portion may include a straight portion or a curved portion in the middle, but is usually formed of one curved portion in many cases.

  The curvature radius r of the inner wall of the curved portion is not particularly limited, and is, for example, about 1 to 25 mm (for example, 3 to 20 mm), preferably 5 to 15 mm, and more preferably 7 to 13 mm (for example, 8 to 10 mm). There may be. When the radius r is too large, the shape restoring force of the curved portion is reduced, and the fastening force by the sandwiching portion (action site) may be reduced. On the other hand, if the radius of curvature r is too small, there is a possibility that the sandwiching portion is difficult to open.

  The shape of the extending portion may be linear or non-linear (for example, a curved shape as shown in FIGS. 2, 7, 13, and 15 or a curved shape such as a wave shape). Also good. When the extended portion includes a curved portion curved inward, when applied to a relatively wide protected material, the curved portion contacts (or abuts) the front surface portion of the protected material, and the protruding portion For example, as shown in FIGS. 2, 7, 13, and 15, the action portion cannot act on the wall portion of the protected material at an appropriate position and the tightening force may be reduced. A curved shape curved outwardly is preferable. In addition, the protective material of the present invention has a predetermined working part in the projecting portion of the sandwiching portion, so that even if the shape of the extending portion is linear, a high fastening force can be applied, and the protective material is wide. Can also be effectively protected. Moreover, the extension part should just oppose each other in the form which was free | released or the form which can be released, and the extension part which opposes may be contacting, and you may oppose at predetermined intervals. The space [or width (or interval)] between the extending portions is not particularly limited, and may be wide, or may be narrow (or may be a slide) as shown in FIGS.

  In many cases, the extending portion usually extends upward or downward at an angle β with respect to the horizontal plane. When the first base point is located on the upper side with respect to the horizontal plane passing through the base point of the extension portion, the angle β can be expressed as a positive angle and can be set in the upward direction. The angle β is expressed as a negative angle and can be in the downward direction. This angle β can be selected from a range of about −60 to 60 ° depending on the form of the protective material, and is, for example, −50 to 50 °, preferably −40 to 40 ° (eg, −30 to 30 °), and more preferably. May be about −20 to 20 ° (for example, −10 to 10 °). Further, the angle β may be an angle of 0 ° or more (for example, 0 to 60 °), for example, an angle larger than 0 ° (for example, 1 to 60 °), preferably 5 to 45 °, further Preferably, it may be about 10 to 35 °. Furthermore, the angle β may be an angle of 0 ° or less (for example, −60 to 0 °), for example, an angle of less than 0 ° (for example, −60 to −1 °), preferably −45 to −−. It may be about 5 °, more preferably about −35 to −10 °.

  The angle β may be determined based on the base point of the extension part, and the second base point (the inner wall part of the extension part corresponding to the contact point with the horizontal plane) is defined as the base point (or reference) of the extension part. Then, the extending part may extend upward (inward direction) or horizontally with an angle β1 with respect to the horizontal plane. The said angle (beta) 1 can be selected from the range of about 0-60 degrees (for example, 0-50 degrees) by the form of a protective material, for example, for example, 3-50 degrees, Preferably it is 5-40 degrees (for example, 10-degree). 30 degrees). In addition, when there are two or more contact points between the curved portion or the extension portion of the protective material and the horizontal plane, the angle β1 can be obtained with reference to a contact point close to the slit-shaped portion among the contact points. Further, when the third base point (displacement point) is the base point (or reference) of the extension part, the extension part extends upward or downward (outward direction) at an angle β2 with respect to the horizontal plane. Also good. The angle β2 can be selected from, for example, a range of about −60 ° to 60 °, for example, −50 to 50 °, preferably −40 to 40 ° (eg, −30 to 30 °), and more preferably −20. It may be about -20 ° (for example, -10 to 10 °).

  Further, the angle β2 may be an angle of 0 ° or more (for example, 0 to 60 °), for example, an angle larger than 0 ° (for example, 1 to 60 °), preferably 5 to 45 °, further Preferably, it may be about 10 to 35 °. Further, the angle β2 may be an angle of 0 ° or less (for example, −60 to 0 °), for example, an angle of less than 0 ° (for example, −60 to −1 °), preferably −45 to −−. It may be about 5 °, more preferably about −35 to −10 °. If the angle β (the angle β1 or the angle β2) is too small, the shape restoring force of the curved portion and / or the extended portion may be reduced, and the tightening force may be reduced. Conversely, if the angle β is too large, the sandwiching portion is difficult to open. There is a risk of becoming.

  As shown in FIGS. 2, 13, and 15, the sandwiching portion (or engaging portion) may be bent and continue from the distal end portion of the extending portion, and bend and extend as shown in FIG. 7. You may continue from the front-end | tip part of a protrusion part. The position of the tip of the extension (or the end on the extension part side of the sandwiching part) is above the horizontal plane passing through the point (or breaking point) where the stress is most applied in the opening / closing operation of the bending part. You may be located in the (back side of a front surface protection part) or the lower side (or outer side). The protective material of the present invention is located on the lower side of the horizontal plane, and even if the shape restoring force of the curved portion (or extending portion) is reduced (or relaxed), the protective material is located on the inner side of the base portion or the base inner wall of the sandwiching portion. Since the predetermined action site is provided, the protected material can be sandwiched with a relatively high tightening force, and can be applied to a wide protected material.

  The extension part and the clamping part form an angle α (inner angle). The angle α can be appropriately selected from a range of about 30 to 130 ° (for example, 30 to 120 °) depending on the form of the protective material (for example, the angle β). 100 °), preferably 40 to 90 ° (for example, 45 to 85 °), more preferably about 50 to 80 ° (for example, 55 to 70 °). Similarly to the angle β, the angle α may be determined based on the base point of the extending portion, and the angle α1 and the angle α2 can be selected from the same range as the angle α. If the angle α (the angle α1 or the angle α2) is too large, the tightening force may be reduced and it may be difficult to engage with the corner of the material to be protected. There is a risk that the site of action cannot effectively act on the protected material.

  In the protective material of the present invention, if the working part of the sandwiching portion is located on the inner side of the inner wall of the base, it is possible to protect even a wide protected material. As shown in FIG. 15, the site of action may be located on the outer side (slit-like side) from the first base point toward the front protective part (angle γ <0 °). From the standpoint that the side wall of the door can be clamped with a sufficient tightening force, it is located on the line toward the front protection part (angle γ = 0 °), preferably inside the line toward the front protection part (angle γ> 0 °). It may be. That is, as shown in FIGS. 3, 7, 13, and 15, when the angle γ is a protective material having an angle of 0 ° or more, the angle γ is, for example, 0 to 150 ° (for example, 10 to 130 °). For example, 20 to 110 ° (for example, 25 to 100 °), preferably 30 to 90 ° (for example, 35 to 80 °), and more preferably 40 to 70 ° (for example, 45 to 60). Degrees), for example, about 1 to 50 degrees (for example, 3 to 45 degrees), preferably about 5 to 40 degrees, and more preferably about 10 to 30 degrees (for example, 15 to 20 degrees). Also good. If the angle γ is too large, there is a possibility that the action site of the sandwiching portion cannot be effectively applied to the material to be protected. Conversely, if the angle γ is too small, the tightening force may be reduced. Assuming that the shape of the material to be protected is bilaterally symmetrical, as shown in FIGS. 3, 8, 14, and 15, the first base point of the perpendicular to the horizontal plane on which the protective material is placed is The angle γ can be defined based on the perpendicular passing through. In addition, when the shape of the material to be protected is asymmetrical, for example, it is assumed that the front protective body is flat or flat, and the perpendicular passing through the first base point is perpendicular to the front protective body. The angle γ may be defined as a reference.

  The thickness h1 of the extending portion and the length h2 of the sandwiching portion may be engaged or actable, and may have a relationship of 0 <h2 <h1, preferably h1 ≦ h2, more preferably h1 ≦ The relationship may be h2 ≦ 3 × h1 (for example, h1 ≦ h2 ≦ 2 × h1). If h1 is too long with respect to h2, there is a possibility that the action part of the clamping portion cannot act at an appropriate position with respect to the side wall of the material to be protected and may be easily detached from the material to be protected. If h1 is too short, the shape restoring force of the sandwiching portion is reduced, and the fastening force may be reduced.

  The clamping part should just have a predetermined action part, and this action part may contact or engage with the corner | angular part or side wall (or corner side wall) of a to-be-protected material. In order to securely engage the corners of the material to be protected and improve the tightening force, this clamping part is usually of a tip-like shape, for example, as shown in FIGS. 2, 7, 13, and 15. In many cases, an inclined portion that extends inward toward the tip portion or a protruding portion (or a bulging portion) that protrudes or bulges inward is provided. The inclined portion and / or the protruding portion may form an action site. The inclined portion may be linear or curved inward, and may be formed at least partially inside the clamping portion. Further, although not particularly limited, the protruding portion may be provided in the middle portion or the tip portion of the sandwiching portion, and usually, as shown in FIGS. 2, 7, 13, and 15, the inner wall of the tip portion of the sandwiching portion. In many cases, it is provided on the portion (the wall portion on the curved portion side). In addition, the holding part may be provided with a plurality of protruding parts or inclined parts, and usually, at least one protruding part or inclined part is provided with respect to the holding part. Moreover, the clamping part may be provided with both the inclination part and the protrusion part, and an inclination part and / or a protrusion part may form the engaging part with a to-be-protected material.

  The cross-sectional shape of the sandwiching portion is not particularly limited, and is, for example, a polygon [eg, a triangle, a quadrangle (rectangle, square, inverted trapezoid whose tip protrudes on both sides or inside), a pentagon, etc.], an elliptical shape; And a shape formed by a head portion (for example, a shaft portion such as a rectangle, a circular shape, an ellipse shape or a polygon shape (for example, a triangle, a quadrangle (rectangle, a square shape) in which the head portion protrudes or bulges inside or on both sides of the shaft portion) , Trapezoid, inverted trapezoid, etc.), pentagon, hexagon, etc.).

  The method for protecting the material to be protected using the protective material of the present invention is a method for protecting the material by opening the holding part of the protective material and positioning the holding part on the side wall (or corner) of the material to be protected. Well, for example, a method of opening and holding the clamping part, and positioning the clamping part on the side wall of the protected material to release and protect it; opening the clamping part and hooking this clamping part on the corner of the protected material to release It may be a method of protecting it. In the process of positioning the sandwiching portion, the front protective portion, the curved portion, or the extending portion may contact the material to be protected.

  The form of the material to be protected is not particularly limited as long as it can be clamped by the action part of the clamping part. For example, the cross-sectional shape is a polygon (for example, a triangle, a quadrangle, a hexagon, etc.), a circle, an ellipse, etc. In addition, it may be indefinite. Further, it may be long or short.

[Foamed resin composition]
The protective material of the present invention is formed of a foamed resin composition containing a foaming component.

  Examples of the resin include olefin resins, styrene resins, vinyl chloride resins, vinyl acetate resins, polyvinyl alcohol resins, acrylic resins, polyacetal resins, polyester resins, polycarbonate resins, polyamide resins, and the like. And thermoplastic elastomers containing the constituent components of the resin. These resins may be used alone or in combination of two or more. Among these resins, olefin resins (eg, polyethylene resins, polypropylene resins, etc.), styrene resins (eg, polystyrene), thermoplastic elastomers (eg, olefin thermoplastic elastomers, styrene thermoplastic elastomers, etc.) ) Is preferred, and olefin resins are particularly preferred from the viewpoint of excellent mechanical properties such as flexibility and elasticity.

As the olefin resin, α-C _2-4 chain olefins such as polyethylene (high density polyethylene, low density polyethylene, linear low density polyethylene, etc.), polypropylene, ethylene-propylene copolymer, etc. Examples thereof include polyethylene, ethylene-vinyl acetate copolymer (EVA resin), and polyethylene resins such as high-density polyethylene, low-density polyethylene, and linear low-density polyethylene are widely used.

  As the foaming component, a conventional foaming agent can be used, and a decomposable foaming agent (chemical foaming agent) may be used. However, a volatile foaming agent (physical foaming) is used because the foaming ratio can be improved by a simple method. Agent). Examples of volatile foaming agents include inorganic foaming agents (nitrogen, carbon dioxide, oxygen, air, water, etc.), organic foaming agents (aliphatic hydrocarbons, alicyclic hydrocarbons, aromatic hydrocarbons, chlorinated carbonization). Hydrogen, fluorinated hydrocarbons, alcohols, ethers, aldehydes, ketones, etc.). Of these, lower aliphatic hydrocarbons such as butane (n-butane, isobutane) and pentane (n-pentane, isopentane, etc.) are widely used because they are inexpensive and have low toxicity.

  The ratio of the foaming component is, for example, 0.01 to 30 parts by weight, preferably 0.1 to 25 parts by weight, more preferably 1 to 20 parts by weight (particularly 5 to 15 parts by weight) with respect to 100 parts by weight of the resin. Part) grade.

  The foamed resin composition may contain a cell regulator. Examples of the bubble regulator include silicon compounds (talc, silica, zeolite, etc.), inorganic acid salts (carbonates or hydrogen carbonates such as sodium carbonate and sodium hydrogen carbonate), organic acids or salts thereof (citric acid, citric acid, etc.). Sodium oxide, calcium stearate, aluminum stearate, zinc stearate, etc.), metal oxides (zinc oxide, titanium oxide, aluminum oxide etc.), metal hydroxides (aluminum hydroxide etc.) and the like. You may use these bubble regulators individually or in combination of 2 or more types.

  The ratio of the cell regulator is, for example, 0.01 to 10 parts by weight, preferably 0.05 to 5 parts by weight, more preferably 0.1 to 3 parts by weight (particularly 0.5 parts by weight) with respect to 100 parts by weight of the resin. ~ 2 parts by weight).

The foamed resin composition may contain an antishrink agent. Examples of the shrinkage preventive agent include fatty acid esters (such as esters of _C8-24 fatty acids such as palmitic acid mono to triglycerides and stearic acid mono to triglycerides) and fatty acid amides (palmitic acid amide, stearic acid amide, etc.). And _C8-24 fatty acid amide). These shrinkage inhibitors can be used alone or in combination of two or more.

  The proportion of the shrinkage inhibitor is, for example, 0.01 to 30 parts by weight, preferably 0.05 to 20 parts by weight, more preferably 0.1 to 10 parts by weight (particularly 1 to 5 parts by weight) with respect to 100 parts by weight of the resin. Part by weight).

  Foamed resin compositions are customary additives such as colorants (dyes, pigments, etc.), surface smoothing agents, stabilizers (antioxidants, heat stabilizers, UV absorbers, etc.), viscosity modifiers, compatibilizing agents. Agent, dispersant, antistatic agent, antiblocking agent, antifogging agent, filler (calcium carbonate, carbon fiber, etc.), lubricant, mold release agent, lubricant, impact modifier, plasticizer, flame retardant, biocide ( Bactericides, bacteriostatic agents, antifungal agents, preservatives, insecticides, etc.), deodorants and the like. These additives can be used alone or in combination of two or more.

  The expansion ratio of the foamed resin composition can be selected, for example, from a range of about 10 to 80 times, preferably 15 to 60 times, and more preferably about 20 to 40 times. If the expansion ratio is too low, the impact absorbability may be lowered, and if it is too high, the flexibility may be lowered.

  The average cell diameter of the foamed resin composition is, for example, about 0.3 to 2 mm, preferably 0.4 to 1.8 mm, more preferably about 0.5 to 1.5 mm (particularly 0.8 to 1.3 mm). is there. When the average cell diameter is too low, it is difficult to increase the expansion ratio, and when it is too large, the surface smoothness and mechanical properties are deteriorated.

  The foamed resin composition may have an open cell structure, but a structure containing at least closed cells is preferable, and closed cells are particularly preferable. The ratio of closed cells to the total bubbles (total of open cells and closed cells) is, for example, 85 to 100%, preferably 90 to 100% (for example, 90 to 99%), and more preferably 93 to 100% (for example, , 93-99%).

[Production method]
The protective material of the present invention can be produced by extruding a molten resin composition containing a foaming component. For example, by melting and kneading a resin composition containing a foaming component and extruding it from a mold having a die having a predetermined shape, the extruded foamed resin composition expands while being foamed in the air, and is cooled by a sizing die. , Molded into a protective material of a predetermined shape.

  As the production conditions for melt-kneading and extrusion foaming, the production conditions in a conventional foam production method can be used.

  Examples of the extruder used in the molding process include a single screw extruder (for example, a vent type extruder), a multistage extruder (for example, a tandem extruder), and the like, and it is easy to adjust foaming conditions. An extruder (especially a twin-screw tandem extruder or the like) is preferred.

  In the molding step, the method of introducing the foaming agent is not particularly limited, and may be preliminarily blended with the resin composition. However, the foaming component (for example, butane is used in an extruder from the viewpoint that the expansion ratio can be improved by a simple method. Etc.) are preferably introduced. For example, a resin composition is charged into a first extruder on the upstream side of a twin-screw tandem extruder, and a foamed component is injected from the middle of the first extruder to obtain a foamed resin composition. A method of cooling to the proper foaming temperature with the second extruder and extruding from the mold can be exemplified.

  The screw diameter of the second extruder may be, for example, about 1.1 to 1.5 times, preferably about 1.2 to 1.4 times the screw diameter of the first extruder. .

  In the cooling process of the extruded resin foam composition, in parallel with the cooling process by the sizing die, a cooling medium (particularly, compressed air) such as compressed air, blower (air), and water is sprayed to cool the surface. You may shape | mold into a predetermined shape.

  The temperature of a cooling medium is not specifically limited, For example, 0-60 degreeC, Preferably about 10-50 degreeC may be sufficient.

  In the method of injecting compressed air, the air pressure may be, for example, about 0.1 to 10 MPa, preferably about 0.2 to 5 MPa (for example, 0.3 to 1 MPa). The injection amount of compressed air may be, for example, about 100 to 1000 liters / minute, preferably about 200 to 500 liters / minute.

  The shape of the discharge port (die lip) of the base can be appropriately selected depending on the shape of the protective material. May be used.

  Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples.

Example 1
A resin composition having the following formulation was introduced into a first extruder (screw diameter: 65 mm) of a tandem extruder (manufactured by Pla Giken Co., Ltd.), and butane gas [i-butane / n-] from the middle of the first extruder. Butane (volume ratio) = 20/80] After injecting 13 parts by weight, the mixture was cooled to an appropriate foaming temperature with a second extruder (screw diameter: 90 mm), and subjected to foam extrusion from a die attached to the tip. Furthermore, it cooled with the sizing die and the protective material of the form shown by FIG. 1 was obtained. The width W of this protective material is 130 mm, the height H is 55 mm, the thickness is 8.8 mm, the curvature radius of the inner wall of the curved portion is 12.5 mm, the angle α1 is 50 °, the angle α2 is 47 °, and the angle β1 is 13 °. The angle β2 is 8 ° and the angle γ is 45 °.

(Resin composition)
100 parts by weight of low-density polyethylene (manufactured by Tosoh Corporation, “Petrocene 173R”) Antishrink agent: stearic acid monoglyceride (manufactured by Riken Vitamin Co., Ltd., “S-100”) 0.3 part by weight palmitic acid monoglyceride (RIKEN vitamin) (Manufactured by Co., Ltd., "PV-100") 1.7 parts by weight Air bubble regulator (manufactured by Eiwa Kasei Co., Ltd., "ELB-348") 0.8 parts by weight.

Example 2
Under the same formulation and the same manufacturing conditions as in Example 1, the angle α1 is 90 °, the angle α2 is 87 °, the angle β1 is 26 °, the angle β2 is 13 °, the angle γ is 36 °, and the thickness is 8.9 mm. A protective material similar to that in Example 1 was obtained.

Example 3
A protective material similar to that in Example 1 except that the angle α2 is 62 °, the angle β2 is −19 °, the angle γ is 9 °, and the thickness is 8.9 mm under the same formulation and the same manufacturing conditions as in Example 1. Obtained.

Comparative Example 1
A protective material similar to that of Example 1 was obtained except that the holding part 5 was not provided under the same formulation and the same manufacturing conditions as in Example 1.

[Tensile test]
The protective material shown in FIG. 1 is cut 40 mm perpendicular to the longitudinal direction, and using a tensile tester [Yasuda Seiki Seisakusho], both ends of the protective material of Examples and Comparative Examples are opened to 180 mm, The tightening force after 10 minutes was measured. The results are shown in Table 1. The evaluation was based on the following criteria.

○: Tightening force is 50 N or more. X: Tightening is smaller than 50 N.

  As shown in Table 1, the protective materials of Examples 1 to 3 have a larger tightening force than the protective material of Comparative Example 1, and can prevent detachment from the protected material.

  Since the protective material of the present invention is excellent in shock absorption and can protect the protected material with sufficient tightening force, construction materials such as pillars and handrails, furniture such as desks, chairs, bookshelves, interiors, home appliances, etc. Can be used as a protective material in a wide range of fields. In particular, the present invention is applicable to a plurality of protected materials having different widths. For example, in a pillar under construction, it is necessary to prepare a protective material of each size according to the size of the pillar. Not useful.

DESCRIPTION OF SYMBOLS 1, 1a, 1b, 1c, 1d, 1e ... Protective material 2, 2b, 2c ... Front surface protection part 3, 3a, 3d, 3e ... Curved part 4, 4a, 4d, 4e ... Extension part 5, 5a, 5d, 5e ... clamping part 6, 6a, 6d, 6e ... projecting part 7, 7a, 7d, 7e, 70, 70a, 71, 71a, 71d, 71e ... horizontal plane 8, 8a ... contact point 80, 80a ... intersection (second) Base point, base point of extension)
9, 9d, 9e ... bending point (first base point, base point for opening and closing the clamping portion)
9a ... 1st base point (base point of opening and closing of clamping part)
10, 10a ... straight line (second reference line)
11, 11a, 11d ... straight line (first reference line)
12, 12a, 12d ... straight line (fourth reference line)
13, 13a, 13d, 13e ... transition point (third base point, base point of extension)
14, 14a, 14d, 14e ... third reference line 15, 15a, 15d, 15e ... deepest part 21, 21b ... front face protection part body 22, 22b ... curved part 101, 102, 103 ... protected material

Claims (9)

A front surface protection portion that is formed of a foamed resin composition and protects at least the front surface portion of the material to be protected, a curved portion that curves in the side direction from both ends of the front surface protection portion, and extends in a direction approaching each other from the curved portion, And a protective material comprising an extended portion that is positioned apart from each other and a sandwiching portion that is bent or curved inward with respect to the extended portion ; the front protective portion is curved or flat The front protection part main body and the main body side part curved inward from both ends of the front protection part main body are formed in a convex shape; the sandwiching part is curved toward the tip part A protective material provided with an expanding inclined portion and / or a bulging portion that bulges, and the inclined portion and / or the bulging portion are located closer to each curved portion than the base portion or base inner wall of the clamping portion. In a state where the front protective part is placed on the horizontal plane with the front surface facing upward, the extension part is linear or non-linear in the upward or downward direction at an angle β of −60 to 60 ° with respect to the horizontal plane. a protective material for placing serial to claim 1, characterized in that extending. The protective material according to claim 2 , wherein the extending portion is inclined downward with respect to a horizontal plane. The protective material according to any one of claims 1 to 3 , wherein the thickness h1 of the extending portion and the length h2 of the sandwiching portion satisfy a relationship of h1 ≤ h2, and the curvature radius r of the inner wall of the curved portion is 25 mm or less. The front protective part is formed in a convex shape including a curved or flat front protective part body gently curved outward, and main body side parts curved inward from both ends of the front protective part main body. The protective material in any one of Claims 1-4 . The protective material according to any one of claims 1 to 5 , wherein the foamed resin composition contains an olefin resin. With the front protective part placed on the horizontal plane with the front protection part facing upward, the extension part curves upward or downward in a straight line or outward at an angle β of −50 to 50 ° with respect to the horizontal plane. The extending portion has a thickness h1 and a length h2 of the sandwiching portion satisfy a relationship of h1 ≦ h2 ≦ 3 × h1, and the curvature radius r of the inner wall of the bending portion is 5 mm to 15 mm. The protective material in any one of 1-6 . A method for protecting a protected material by opening the protective material and locking the protected material, wherein the holding portion of the protective material according to any one of claims 1 to 7 is opened, and the sandwiched portion is connected to the protected material. The method of protecting a to-be-protected material by being located in the side wall or corner | angular part. A method for producing a protective material composed of a foamed resin composition by extrusion molding, wherein a resin composition containing a molten foam component is extruded from a die of a mold, and molded into the shape of the protective material by a sizing die, method for producing a protective material according to any of claims 1-7.

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