JPS60262879A - Product for bonding dimentionally recoverable part - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to articles for joining dimensionally resilient parts, and more particularly to patches for joining lap ends of dimensionally resilient covers.

PRIOR ART A dimensionally recoverable article is an article whose dimensional shape changes substantially when subjected to appropriate treatment. Typically, upon heating, these articles recover to their original shape prior to being deformed; however, as used herein, the term "recoverable" refers to the ability of these articles to recover to their original shape upon heating, even if they were not previously deformed. It also includes articles that take a shape.

A typical form of dimensionally recoverable article is a heat recoverable article, the dimensional shape of which is changed by subjecting the article to heat treatment. In their most common form, heat-recoverable articles are constructed from heat-shrinkable sleeves made from polymeric materials.

When manufacturing heat recoverable articles, the polymeric material may be crosslinked at any step in the manufacture of the article to enhance the desired dimensional recovery. One method of making heat recoverable articles is to form the polymeric material into the desired heat stable shape and then crosslink the polymeric material, making the article either crystalline melting point or amorphous, depending on the type of polymer. It consists of heating the article to a temperature at which the polymer is softened, deforming the article, and cooling the portion thereof to maintain the deformed state of the article.

In use, the article in the deformed state is inherently unstable, so that upon application of heat it will assume its initial heat stable shape.
The outer cylindrical member, the elastic member, is held in a stretched state by the inner cylindrical member, the second part (4), and is heated to soften the member and restore the elastic member.

Recoverable articles are frequently used to cover objects having a tubular or otherwise rectangular elongate shape, for example to provide environmental sealing protection. If free ends of a long object are not available, use so-called wraparound articles, which are articles that are typically fitted in sheet form by wrapping around the object to be covered, so that opposite longitudinal ends overlap. is normal.

Wrap around objects for gripping articles;
A crawler means is applied to secure the opposing longitudinal ends together.

In U.S. Pat. No. 4,200,676, one means of closure for wraparound articles is to have a layer of cross-linked hot melt adhesive coated on one surface of a reinforcing polymer layer (also known as a patch closure). It is known to use laminated strips. The patch strip is placed along the closure line and the adhesive layer is activated by heat to provide a secure bond between the overlapping ends of the wraparound article.

Other known wraparound articles are described in European Patent Application No. 100170. The article is constructed from a single notebook layer of heat-shrinkable polyolefin material. The overlapping ends of the wrapped notes are held together by simply heating the notes so as to weld the ends together. Separation patches are not used.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a cover that can be used for wrap-around articles, is easy to manufacture, and does not require a separate adhesive inner layer as required in known batch closures. The object of the present invention is to provide a patch closure that can withstand such high resilience. This and other objectives can be achieved by using a patch comprising a laminate of two polymer layers and one intermediate reinforcing layer and by carefully selecting the crosslinking density and Bott monochorus of the two layers.

SUMMARY OF THE INVENTION The present invention is a dimensionally stable closure patch that joins overlapping ends of a dimensionally resilient polymeric cover, comprising: 1
and a second polymer layer, the second layer having a sufficiently low bot monochorus or non-crosslinked so that it melts when the patch is heated and bonded to the recoverable cover, and the first layer is non-crosslinked. , is crosslinked and has a sufficiently low bot monochorus to be compatible with and bond to the second layer immediately prior to bonding, and at least not to melt when the patch is heated and bonded to the cover. To provide a clone yer pazochi having a sufficiently high hot modulus.

The compatibility of different polymer compositions depends on a variety of factors, including the chemical nature of the polymer and other components (eg, fillers) of the composition. Those skilled in the art will have no difficulty in determining whether two particular compositions are compatible. In many (but not all) cases, compatibility will mean, for example, that at least 10% of the repeating units of the polymeric component of the first composition, preferably at least 30% of the repeating units of the polymeric component of the second composition. %, preferably at least equal to 30%.
This is the result of a substantial amount of common repeating units in the polymers of different compositions. These percentages are based on the number of repeating units.

It is preferred that the Bott monochorus of the first layer be sufficiently low to allow melting to bond to the second layer.

Because one or both polymers are melted, the polymers are at their softening point (or, in the case of crystalline polymers, their crystalline melting point).
Higher is preferable.

The present invention provides a heat-stable article I that, in contrast to heat-recoverable articles, does not recover when subjected to heat treatment.

[The phrase ``honot・mono;・last 1'' refers to the material speed 50.
It is defined as the ratio of the strain of a stressed material measured at 150° C. and 100% strain when pulled at mm/min.

The first polymer layer provides a backing layer and the second polymer layer provides a layer that contacts and bonds to the lap ends of the recoverable polymer cover.

The inventors have surprisingly found that by selecting the bottlings of the first and second polymer layers (e.g. by controlling the degree of crosslinking), immediately before bonding, the
the two layers of botmolyses are sufficiently compatible to allow bonding to each other, and when the patch is heated for application, the hotsmolys of the first backing layer is sufficiently high to resist melting upon heating; It has been found that it is possible to produce a laminate patch in which the second layer of bot motsuyulus is sufficiently low to allow bonding of the resilient cover to the lap ends.

The patch of the present invention does not have a separate adhesive layer on its bonding surface, so it is easier to apply than known patches. The second layer of the patch of the present invention is in contrast to an adhesive because it does not resemble an adhesive and does not flow to wet the substrates to be bonded. A particular advantage of the punch of the present invention is that it can be installed on a heat-recoverable cover simultaneously with the recovery of the cover and to a substantial extent that it does not slip against the cover during installation. In contrast, to apply the known patch, it is necessary to apply the patch with a first heating. The patch is then allowed to cool so that the adhesive is fully cured before applying heat to restore the cover. When heating the cover for recovery, care must be taken to avoid reheating the patch area. This is because reheating causes the adhesive to remelt and the patch to slip. Generally, the recuperative heat may not be completely shielded from the badge area, and therefore requires a fairly large overlap of the patch on the cover to prevent slippage. The patch of the present invention does not slip, allowing for the use of narrower patches than previously known. This advantage saves the amount of adhesive required.

The present invention provides savings in cover material. This results, at least in part, from the thinness in the absence of the adhesive layer, which minimizes shielding against heat transfer. Thus, the degree of overlap of the ends wrapped around the cover is reduced so that the overlap area or the entire patch is under the patch, and the heat is transferred to the overlap area to seal the cover along the joint without significant risk. Applicable.

Although this may or may not be the case, the patch of the present invention may be stitched, stapled and/or punched as disclosed in European Patent Application No. 137648 by the applicant
Alternatively, it may be attached to the heat recoverable cover to be closed prior to installation of the cover by a mechanical bonding arrangement that does not penetrate the cover or by an adhesive. This reduces the chance of misplacement of the patch by the wearer. Although the punch may generally be attached at or toward the distal end of the cover, the attachment of the patch to the cover may be inserted from the distal end to define a flap that underlies the overlapping portion of the cover. Clear placement of patches is beneficial as smaller patches may be used allowing for savings.

The bottlings of the first and second polymer layers may be the same or different. It is preferred that the bot motulus of the first layer is higher than the hot modulus of the second layer, or that the first backing layer has a hot modulus and the second layer is non-crosslinked.

For any given polymeric material, a range of Bottmotsuyulas can be used to provide an operable patch. This operable range will vary depending on the material selected for use. The upper and lower limits of the range are determined by the function that the patch performs.

In the first backing layer, the F limit of the Botmotsuyurus is that necessary to avoid total melting of the two-layer patch when heat is applied to apply the patch.

In a preferred embodiment, the first backing polymer layer contains carbon black (preferably greater than 20%) to increase the electrical conductivity of the polymer.

By containing carphone black, the lower limit of the bottlings of the backing layer is lowered. This is because carbon black quickly disperses the heat applied when the patch is worn.

The upper limit of the bot motility of the first backing layer is determined by the ease with which the first backing layer and the second layer can be laminated.

If the hot modulus is too high, the second layer will not bond to the first backing layer.

In the second polymer layer, the hot modulus limit is determined by the heat required to melt the polymer for mounting the punch. Generally, the higher the botmotsulus, the higher the heat flux required to apply the patch.

The hot modulus of the polymer layer can be conveniently controlled by varying the crosslink density. Generally, the higher the crosslink density, the higher the hot modulus.

In preferred embodiments, the second layer is not crosslinked. That is, the crosslinking density is zero. In this case, for most polymers, the phrase "bottomylus" has no meaning. This is because the material melts at temperatures below the hot modulus test temperature of 150°C.

The compositions of the polymers used in the first and second polymer layers may be the same or different. Preferably, the polymers used are the same. This is beneficial in manufacturing.

Examples of polymeric materials that may be used for the layer are polypropylene, poly(butene-1), ethylene, propylene, copolymers of butene-1 and hexene-1, ethylene and vinyl acetate, esters such as acrylic acid, or methacrylic acid or J.

Mention may be made of copolymers with stellates (in which ethylene is the main component), mixtures of the abovementioned polymers with each other, and mixtures of the abovementioned polymers with elastomers. In particularly preferred patches, one, preferably both, layers comprise polyethylene or polyethylene-containing mixtures, particularly preferably high density polyethylene or mixtures thereof.

When the patch layer comprises polyethylene or a polyethylene-containing mixture, it is preferred that the material is primarily polyethylene. Preferably, the material comprises a small amount (75% by weight) of polyethylene.

The polymer layer may contain small amounts of other additives (e.g. flame retardants and antioxidants) depending on the desired use of the patch closure cover.
May contain.

Immediately before bonding to the second layer, the first backing layer is
, 5 kg/cm'. 1st layer is 1-2.5k
It is further preferred that the first layer has a hot modulus of 15-2.5 kg/ctm'.

Most preferably, the bot motsuyulus is about 2.5 kg/cm'.

The maximum crosslink density of the second polymer layer is 2.5 kg/cm'
, preferably one that produces a maximum bottling of Ikg/c♂.

It is particularly preferred that the second polymer layer is non-crosslinked.

-1- Preferred crosslinking density and Botmotsuyurus are:
Particular preference is given when the layer is polyethylene or a polymer mixture consisting mainly of polyethylene.

The two layers may be crosslinked to the same or different extent. The first layer is always crosslinked, but the second layer is non-crosslinked (ie, the degree of crosslinking is zero) and may be -). Preferably, the first backing layer is crosslinked to a greater extent than the second layer. Crosslinking may be carried out by irradiating the material with a high energy electron beam. The crosslink density difference between the layers is such that one layer (preferably the first backing layer) is compared with the other layer (preferably the second layer).
By irradiating with higher doses, e.g. by irradiating for longer periods of time, or by irradiating, cross-linking can be promoted.
may be obtained by the use of additives that increase or reduce the

In a preferred embodiment, polymers of the same composition are used in the first and second layers, with the first layer being more crosslinked than the second layer. This will result in a higher hot modulus for the first layer than for the second layer.

Preferably, the thickness of the patch is less than 1.5 mm, more preferably less than lll1 m. Thin patches are beneficial because they minimize the amount of PI or overlapping areas that would otherwise be subjected to peel forces.

A thin patch is advantageous in that its overall heat transfer is higher than a much thicker band. This is particularly beneficial when attaching the patch to a heat-recoverable cover 1-.

The thickness of the backing layer depends on whether it is applied from the outer surface of the patch or
Prevents the reinforcement layer sandwiched between the polymer layers from being adversely tilted by 4°1
Preferably, the thickness is sufficient to be 14 mm. In preferred embodiments, the first backing layer is preferably about 0.6ffi@.

The second layer provides any protective function to the sandwiched reinforcing layers and is therefore thinner than the first layer.

In a preferred embodiment, the thickness of the second layer is approximately 0.3 mm.
It is. A layer as thin as 031 is particularly preferred when the second layer has a low or zero crosslinking density. This is because the lower the crosslinking density, the more fluid the polymer becomes when heated. Thus, if a thick second layer is used, the first polymer layer and reinforcing layer will slide over the substantially thicker underlying molten second layer during installation. In contrast, when using thin layers, there is some friction between the first polymer layer and/or reinforcing layer and the resilient cover that minimizes such slippage.

The holes in the reinforcing layer are preferably arranged regularly,
Preferably, the perforated reinforcing layer has a fabric layer. Preferably, glass fiber cloth is used.

Another fiber that may be used in the reinforcing layer is Kevlar (Key
lar (trade name), polyamide and polyester fibers. The pores are preferably large relative to the surface area of the reinforcing layer so that maximum contact is between the two polymer layers through the pores. It is preferred to use a perforated layer with at least 90% open space.

The thickness of the reinforcing layer should be as thin as possible with adequate strength and sufficient space to prevent air from becoming trapped in the pores of the reinforcing layer between the first and second polymer layers. Preferably thin. The thickness of the reinforcing layer is preferably less than 0.3 mm, particularly preferably about 0.25 mm.

An example of a suitable reinforcing fabric layer is Tralijlas 96 (AC) commercially available from Noncoglass.
, trade name), and its composition is as above. Glass fiber coated with 11 anti-lit layers of polyvinyl acetate! 76 fibers/cm in the warp direction, 31 tex in the warp direction, 39 fibers in the weft direction/C1n, Fi"a 68 y -/'
y 7゜Weight 55g/cm' Open space 94%.

Preferably, the reinforcing layer is embedded in one or both polymer layers during manufacture of the patch.

The reinforcing layer prevents, or at least minimizes, the elongation of the patch width that, in the absence of the reinforcing layer, could occur due to the restoring forces acting on it during cover recovery, at the lap ends of the covers joined by the patch. do.

The patch can be manufactured with any angle between 0 and 90 degrees between the warp or weft fibers of the reinforcing fabric and the main direction of recovery of the wraparound cover. However, it is preferred that the warp and weft fibers are oriented at angles to accommodate changes in the patch base during sleeve recovery. The angle of the warp and weft fibers with respect to the main recovery direction of the sleeve may be, for example, from 15 to 75°, preferably from 30 to 60°, more preferably from 40 to 50°, for example about 45°. This allows the fibers of the patch to accommodate small changes in cover width during cover recovery, measured perpendicular to the recovery direction, generally along one or both of the lap ends. Changes in patch base can be accommodated by changing the angle between the warp and weft fibers of the fabric. The patch can be made by cutting a laminated patch from a notebook or a suitable shaped piece of cloth or by weaving a piece of cloth suitable for use in the patch with warp and weft angles within the above limits. May be formed directly.

By properly selecting the warp and weft fiber angles, the patch can adapt to small changes in sleeve width and thereby minimize the effects caused by the resiliency of the sleeve. Resistant to stretching in the width direction.

Resistance to patch elongation is particularly important when the patch is used to join lapped ends of covers that recover with high resilience.1 In some applications, high It is advantageous to use a recoverable polymer cover that exhibits crystallinity and high motility. However, 4-year-old cutlets with high crystallinity and bot motsuyuras recover [-7] with high recovery power.
1,1,-- exerts a high recovery force on any closure mechanism used to secure the recovery rubber around the cage.

Patches of the invention have crystallinity greater than 25% and l k
It is advantageous to use threads to join the lapped ends of lasso pour round covers having a bot motuus higher than g,/cm'. In a preferred embodiment of the invention, 35%
It is advantageous to use it to join lapped ends of rub around force bars with higher crystallinity and hot modulus higher than 2 kg/cm'.

The second layer of the patch provides a bond to the cover with particularly good shear strength. In one preferred embodiment, the peel strength is determined by the addition of two heat-activated strips on the second layer surface, preferably at opposite ends of the patch, such that each strip extends generally parallel to the claw line when the patch is applied. improved by providing a (preferably hot melt) adhesive strip. Examples of heat-activated adhesives that may be used include polyamide or EVA-based polymers. In other embodiments, pressure sensitive adhesive strips (eg, adhesive strips comprising acrylic resin) may be used in place of or in addition to heat activated adhesive strips.

The present invention is a method of making a thermally stable patch joining lap ends of a resilient cover, comprising: (a) crosslinking a first polymer layer; and (b) sandwiching a perforated reinforcing layer. bonding a second polymer layer to the first polymer layer via a perforated reinforcing layer, the second layer having sufficiently low bottling so that it melts when the patch is heated and bonded to the resilient cover. or non-cross-linked, and the cross-linked first layer, immediately prior to bonding, has a sufficiently low bottling to be compatible with and bond to the second layer, and at least the patch is heated and bonded to the resilient cover. To provide a method that has a sufficiently high hot modulus so as not to melt when it is heated.

The patch of the present invention may be applied by heating the patch. The patch is preferably applied by heating with a flame (eg, preferably from a gas torch directed at the first layer of the patch). Application of heat causes the second layer to melt and thus bond to the overlapping ends of the cover. Preferably, the patch is used to join the overlapping ends of the heat recoverable cover. In this case, the heat source used to recover the cover is preferably also used to apply the patch.

The temperature under the patch during installation (i.e. the temperature required to melt the second layer and bond the patch to the cover) is between 150 and 1
Preferably, the temperature is 70°C.

The present invention is a closure patch for use in a heat-recoverable wraparound cover comprising: a layer of polymeric material that is substantially non-melting at the temperature at which the cover is heated to recover;
a layer of sealing material and a fibrous reinforcing layer having a longitudinal end substantially perpendicular to the main direction of recovery of the cover in use, and an angle between the end and the reinforcing layer fibers; Month 5-7
Clothes patches with an angle of 5°, preferably between 30 and 60° are also provided.

The present invention is a closure assembly for enclosing an object comprising a closure patch and a heat-recoverable wraparound cover, preferably attached to the cover by stitching, the closure panoch heating the cover. a layer of polymeric material, a layer of sealing material and a fibrous reinforcing layer that is substantially non-melting at the temperature at which it is recovered; 15~75°,
(preferably from 30 to 600).

According to another aspect of the invention, the invention is a method of covering a long object, comprising: (a) covering an object J) such that opposite ends of the covering overlap;
Wrap a J′ legally recoverable polymer cup around it, and (b) construct it with overlapping ends [J-gloss wire].

Applying the J-Gloss patch, the J-Gloss patch consists of a layer of polymeric material that is substantially non-melting at the temperature at which the patch is heated to recover, a layer of sealing material and a fibrous material. a reinforcing layer, the angle between the reinforcing layer fibers and the main recovery direction of the cover is 15 to 75°, especially 40 to
(c) heating the patch to activate the encapsulant material layer;
A method is provided comprising bonding a patch to a cover, heating the cover, and recovering the cover.

The fibers of the reinforcing layer have a density of 0 to 90 with respect to the main direction of cover recovery.
The preferred alignment at an angle of 0.degree. degrees allows for advantageous adaptation to changes in patch length (measured perpendicular to the direction of cover recovery) during cover recovery.

The angle is preferably 15 to 75 degrees, more preferably 30 to 60 degrees.
, most preferably between 40 and 50 degrees, especially about 45 degrees.

Preferably, the fibrous reinforcing layer comprises a cloth such as a woven cloth. Preferably, the fabric fibers are made from a material with suitable mechanical properties and heat resistance. Glass fiber is preferred.

The polymer layer may comprise any of the above materials suitable for use in the first and/or second layer of the patch mentioned at the beginning of the invention. Polyethylene or mixtures thereof are preferred, and crosslinked ones are particularly preferred.

The sealing material layer may be a sealant (e.g., mastic), an adhesive (e.g., true melt adhesive or thermoset adhesive), or non-crosslinked or if the patch is heated to bond to the cover. The material may include materials selected from those listed above that have a sufficiently low hot modulus to melt to . Non-crosslinked polyethylene and hot melt adhesives are preferred sealing materials.

Patch, patch or cover or both
Attach to the resilient cover by mechanical bonding arrangements (eg, stitching or stabilization) or adhesive.

(Examples) Below, examples will be shown and a detailed explanation of the present invention will be provided.The present invention is not limited to the following examples in any way.

Example 1 A 061aI 11 thick layer (first layer) of non-crosslinked rubber modified high density polyethylene was extruded onto a lightweight open mesh glass fiber cloth. The polymer was crosslinked by irradiation with high-energy electron beams, giving the polymer a hot modulus of 2.5 kg/cm'. A 0,3 vn thick layer of a polymer (non-crosslinked rubber-modified high-density polyethylene) of similar composition to the first layer (
The second layer) was compression extruded onto the fiberglass cloth side of the first layer.

The second layer remained uncrosslinked.

Example 2 A 0.4 mm thick layer (first layer) of non-crosslinked modified medium density borage resin was coated with a lightweight open-mesh glass fiber cloth.
It was pushed out. A layer of 0.4a+n+ rhinoceros (second layer) of a similar polymer composition was compression extruded onto the glass fiber fabric side of the first layer and the fabric was embedded in the same manner as in Example 1.

The polymer layer and embedded fabric were then irradiated with a high-energy electron beam to crosslink the polymer layer so that each layer had a photomodulus of 8 kg/cm''.

Example 3 A 0.6 sa+ thick layer (first layer) of non-crosslinked rubber modified high density polyethylene was extruded onto an open mesh glass fiber cloth l-. The polymer was crosslinked by irradiation with high-energy electric r-rays, giving the polymer a hot modulus of 1.5 kg/cm'.

A 03InI11 thick layer (second layer) of a polymer similar to the first layer (non-crosslinked rubber-modified high-density polyethylene) was added to the first layer so that the glass fiber cloth was completely embedded between the two layers. The glass was compressed and extruded onto the fiber cloth side. Then, the two polymer layers and the buried fabric were irradiated with a high-temperature Nelky electron beam, and the hot modulus of the first scrap was set to I~2, 5 kg/c.
m' increases and the 21st honotomodulus becomes I kg/c
I made it m'. The first layer was irradiated twice and had a higher hot modulus than the second layer.

Example 4 Non-crosslinked rubber modified high density polyethylene 7 061III+
Thick layer (1st layer) L・Lalurus 96 (J, -No)
(Tralijlas 96 (AC)) Glass fiber cloth -) A notebook was formed by extrusion so that the warp fibers ran approximately parallel to the ends of the notebook. The sheet is irradiated with high-energy electron beams to crosslink, and the polymer is coated with 2.5 kg/
I had a c+a' bot motsuyuras. A 0,311 Im thick layer (second layer) of a polymer of similar composition to the first layer is placed on the fiberglass cloth side of the first layer so that the fiberglass cloth is completely embedded between the two layers. Compression extruded. The second layer remained uncrosslinked. A substantially rectangular closure patch was cut from the sort so that the reinforcing fabric fibers were at an angle of about 45° to the ends of the batch.

This patch was used as a closure system for a wrap-around sleeve having a width of at least 45oIII11. The sleeve was vertical heat shrink with the folded ends of the wraparound sleeve.

When heat was applied to the sleeve to cause it to shrink, the patch accommodated the dimensional changes in the sleeve parallel to the lap ends without wrinkling.

Examples 5 and 6 Closure batches were cut from the laminate sheets produced in Examples 2 and 3 such that the reinforcing fabric fibers were at an approximately 45° angle to the patch ends. When worn as in Example 4, the patch accommodated dimensional changes in the sleeve parallel to the lap ends without wrinkles.

Examples 7-9 Similar to the method of Examples 1-3, reinforcing fibers are extended at an angle of approximately 45° to the laminate ends, ensuring that the tear lines are substantially perpendicular to the sort ends. 45 to the fibers of the reinforcing fabric or to the ends of the sheet.
A rectangular patch with an angle of ° was fabricated. When worn as in Example 4, the patch accommodated dimensional changes in the sleeve parallel to the lap ends without any wrinkles.

Aspects of the patch of the present invention and its attachment to the overlapping end of a recovery device 1 wraparound cover will now be described with reference to the accompanying drawings.

FIG. 1 shows a heat-resistant material comprising a first layer 4 of high-density polyethylene cross-linked by electron beam irradiation so that the bot motsuyuras becomes 2.5 kg/Cm', and a second layer 6 of non-cross-linked high-density polyethylene. Stability patch 2 is shown. The polyethylene layers 4.6 are embedded with a glass fiber cloth layer 8 sandwiched between them. The angle between the warp threads and the sort end 9 is approximately 45°
It is. The thickness of the first layer is 0,6 n+n, and the thickness of the second layer is 0,6 n+n.
The layer thickness is 03IIIm. Glass fiber cloth is 02
It is embedded in a polymer layer, and the total thickness of the patch is 1 inch.

FIG. 2 shows a patch placed on the lapped end of the wraparound heat recoverable cover 12 enclosing the vibrator 14. FIG.

FIG. 3 shows the arrangement of FIG. 2 after applying heat with a gas torch. The cover 12 has been restored to fit the vibrator 14 and the second layer 6 has melted. The second layer 6 is thus bonded to the cover 12. 1st layer 4
has a higher bot motulus than the second layer 6 and is not melted. The fabric layer 8 minimizes stretch of the patch under the action of the restoring forces exerted by the restored cover 12.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the patch of the present invention, FIG. 2 is a diagram showing the patch worn when using the cover, and FIG. 3 is a diagram showing a portion of FIG. 2 after heat application. 2. Patch, 4 1st layer, 6 2nd layer, 8. Cloth layer,
9 note end, 12 cover, 14 vibe. Patent Applicant N. Tsuko Raychem Sonoete Anonymous Agent Patent Attorney Two Idiots Procedural Amendment (
June 24, 1985 J Case Description 1985 Patent Application No. 117637 2 Title of Invention Article for joining dimensionally recoverable parts 3 Person making amendments Relationship to the case Patent Applicant Address 3200 Kesselro, Belgium , De East Sesteenbeek No. 692 Name N. Tsuko. Reikem Société Anonyme 4. Agent 5. Date of amendment order: Voluntary Continuation of page 1 ■ Int, C1, 4 Identification code Internal serial number priority claim ■198 Cape April 4th 6 (Gillis (GB) 085089
550 Inventor Joseph Φ Frans Lillet Helgi Country 2690 Isa Pan Perse 121 Temse, Holehegstraat 495-

Claims (1)

Claims: 1. A thermostable closure patch joining lapped ends of a dimensionally resilient polymeric cover, comprising first and second layers bonded to each other through a perforated reinforcing layer sandwiched therebetween. two polymer layers, the second layer having a sufficiently low hot modulus or non-crosslinked so that it melts when the patch is heated and bonded to the recoverable cover, and the first layer comprising:
cross-linked and have a sufficiently low hot modulus to be compatible with and bond to the second layer immediately prior to bonding, and at least sufficiently low to not melt when the patch is heated and bonded to the cover. Closure patch with high hot modulus. 2. The hot modulus of the first layer immediately before bonding to the second layer and/or when the patch is heated and bonded to the cover is 0.8-2.5 kg/cm', preferably 15-2
, 5 kg/ctm'. 3 The hot modulus of the second polymer layer is 25 kg/
4. A closure batch according to claim 1 or 2, wherein one or both of the layers comprises polyethylene or a polyethylene mixture preferably comprising at least 75% polyethylene. Clothes punch according to any of Item 3. 5. Both polymer layers are irradiated with high-energy electron beams.
5. A cloth patch according to any one of items 1 to 4, wherein the first layer is subjected to more electron beam irradiation than the second layer. 6. The closher patch according to any one of items 1 to 5, wherein the reinforcing layer has a cloth mesh. 7 The angle between the warp of the fabric and the one recovery direction of the cover when attached to the lap end 1- of the Dimensional Recovery cover is 15
~75°, preferably 30-60°, especially 40-50°
7. The clothing patch according to claim 6. 8. A closure badge according to any of the preceding clauses, which is attached to a dimensionally resilient force bar, preferably by stitching. 9. A method of manufacturing a thermally stable patch joining lap ends of a recoverable cover comprising: (a) crosslinking a first polymer layer; (b) perforated reinforcement with a perforated reinforcement layer therebetween; bonding a second polymer layer to the first polymer layer through a layer, the second layer having a sufficiently low hot modulus such that it melts when the Noto Soji is heated and bonded to the resilient cover. or non-crosslinked, and the crosslinked first layer has a sufficiently low hot modulus to be compatible with and bond to the second layer immediately prior to bonding, and at least the patch is heated and the recoverable cover is A method of having a high enough bottling to avoid melting when bonded to 10. The method of claim 9 further comprising a crosslinking step applied to both polymer layers after they have been bonded. II. A method of covering a long object comprising: (a) wrapping a dimensionally resilient polymeric cover around the object such that opposite ends of the cover overlap; and (b) wrapping a closure over a closure line defined by the overlapping ends. Applying the patch, the closure patch comprises a layer of polymeric material that does not substantially melt at temperatures at which the patch is heated to recover, a layer of sealing material and a fibrous reinforcing layer, the reinforcing layer being fibrous. and the main recovery direction of the cover from 5 to 75°, especially from 40 to 5
(C) heating the punch to increase the activation ratio of the sealing material layer;
A method comprising bonding a patch to a cover, heating the cover, and restoring the cover. 12. A closure patch for use in a heat-recoverable rubber around force bar, comprising a layer of polymeric material that does not melt substantially at the temperature at which the cover is heated to recover, a layer of sealing material, and a fibrous reinforcing layer. and having a longitudinal end substantially perpendicular to the main recovery direction of the cover in use, and an angle between the end and the reinforcing layer fibers of 5 to 75°;
A closure batch preferably having an angle of 30 to 60°.