DK153565B - CLOTHING BAND FOR BUNDLING OF VEGETABLES - Google Patents

Description

DK 153565B

The invention relates to an adhesive tape for bundling vegetables, flowers or the like of an adhesive applied to a surface of a water-resistant carrier on the basis of a styrene-containing 5-block copolymer containing a thickening agent.

To bundle or bond vegetables, flowers and the like, various adhesive tapes have been used to date: A. A pressure sensitive adhesive is applied to one end of the surface of the carrier foil and to the other end of the back of the carrier foil. At the bundle, the two ends are placed over each other so that the adhesive on the ends of the tape adheres together to form a firm bond.

B. A pressure-sensitive adhesive is applied to the front of the carrier over the entire surface and to the back of the carrier at regular intervals. At the bundle, the ends of the adhesive tape are placed over one another in the same manner as at A, such that the ends adhere together and form a firm bond.

20 C. A pressure-sensitive adhesive is applied to the front and back over the entire surface of the carrier foil or carrier strip, and at the bundling, the adhesive is adhered to those surfaces.

In these known adhesive tapes, the pressure-sensitive adhesive 25 has a strong self-adhesive capacity, so that a strong bond is formed between the surfaces applied to the adhesive, but the adhesive does not adhere to other surfaces of the adhesive tape itself or to objects, which is a disadvantage.

In addition, the above known adhesive tapes have other disadvantages.

In the above-mentioned case A. many strips of different length are required, these lengths varying depending on the type of materials to be bundled, as well as the volume of materials to be bonded to a bundle. However, it is rather cumbersome and inconvenient to produce such 2

DK 153565B

adhesive tapes of different lengths. In general, in these known cases, the bundling of vegetables and the like with such adhesive tapes cannot be done in a simple manner with a bundling machine.

As stated above, the adhesive layers of the known adhesive tapes are adhered strongly to each other but not to the surfaces of other objects. Thus, when bonding vegetables, the adhesive tape cannot be held stationary on the outer surfaces of the bundle but may slip out of its original position whereby the vegetable bundle falls apart. This disadvantage can be partially mitigated by tightening the vegetables, but this has the disadvantage that the vegetables are cut into pieces or that the adhesive tapes cut into the vegetables, thereby reducing the value of the product.

It is therefore the object of the invention to provide an adhesive tape of the kind set forth above wherein the adhesive has. a strong self-adhesive as well as a low, but sufficient 20 adhesive capacity on the objects to be bundled and where the adhesive has a good creep strength.

The adhesiveness of the adhesive to other materials must be so weak that the adhesive tape can be easily removed from it without damaging or affecting the bundled materials. On the other hand, however, this bonding must be so strong that the adhesive tape during transport and during handling of the bundle does not shift on it or slip off.

An adhesive of the type listed above on the basis of a styrene-containing block copolymer containing a thickening agent is known from DE Publication No. 2,417,912. This known adhesive is a self-adhesive melt-on adhesive material which can be applied, for example, to a strip in the molten state and, upon cooling, exhibit self-adhesive adhesive properties. This known adhesive must 3

DK 153565B

without the addition of a tensile oil, good adhesion, good adhesion and good cohesion. The known adhesive contains as essential constituents both a styrene-containing 5-block copolymer and partly a hydrogenated aromatic petroleum resin and optionally polyterpene resins as a thickener or adhesive agent.

However, these known adhesives have been found to be unsuitable for solving the specific purpose of the invention, since they have partly too little initial adhesive capacity and partly too poor self-adhesive capacity, which is explained in more detail below.

Said deficiencies are addressed and the object of the invention is achieved with the adhesive according to the invention, which is characterized in that it consists of A) (as a block copolymer) 100 parts by weight of styrene-isoprene-styrene-block copolymer or a mixture of styrene-isoprene styrene block copolymer and styrene-butadiene-styrene block copolymer, 20 B) (as a thickening agent) 5-150 parts by weight of a mixture of polyterpene and a petroleum resin selected from alicyclic hydrocarbon resins, unsaturated hydrocarbon resins and isoprene hydrocarbon resins C) 0-40 parts by weight of a further relatively low molecular weight polymer compound and D) 0-150 parts by weight of other additives, and the adhesive having an adhesive strength of 100-700 g / 20 mm and an adhesive strength of more than 900 g / 20 mm.

The invention is further explained with reference to the drawing, in which fig. 1 is a perspective view of the adhesive tape of the invention; FIG. 2 shows a cross section through the adhesive tape of FIG. 1 along line II-II, and FIG. 3 shows the adhesive tape according to the invention used for bonding vegetables.

4

DK 153565B

The adhesive tape according to the invention has on a surface of the support material 1 a pressure-sensitive adhesive layer 2 with weak adhesiveness and strong self-adhesion. The carrier material 1 is water resistant and can preferably be applied to pressure and consists in particular of polypropylene, polyethylene, unplastified polyvinyl chloride, polyester and similar plastics. Preferably, the support material has a thickness of from approx. 20 to approx.

60 µm. However, the foil material is not limited to this thickness and may be thicker or thinner if necessary.

It is advantageous when the carrier foil material is classified with respect to the product types to be bonded therewith and the name of the place of production or the date of collection is printed.

The adhesive in the pressure-sensitive adhesive layer 2 has a composition such that the adhesive strength is 100-700 g / 20 mm adhesive bandwidth (tested after applying the adhesive tape to a steel plate under a pressure of 2 bar) and the adhesive strength is greater than 900 g / 20 mm adhesive bandwidth (determined after 20 an adhesive time of 10 minutes from the bonding of the adhesive surfaces to the pressure-sensitive adhesive tape). The adhesive strength of the adhesive tape must not be too high, since when used for bonding soft vegetable species, e.g. spinach, must not adhere too strongly to the vegetable, so that it is damaged when the strip is removed.

In the adhesive on the adhesive tape of the invention, component A, namely the styrene-isoprene-styrene block copolymer alone or in admixture with the styrene-butadiene-styrene block copolymer, is an elastomer.

Component B (thickener) is used as set forth above in an amount of 5-150 parts by weight per unit weight. 100 parts by weight of component A, since quantities outside this range of quantities degrade the adhesive strength and the adhesive strength, and diminish the adhesive's application possibilities for bonding materials. Thickener is used as a thickener

DK 153565B

polyterpenes, in particular polyterpenes having a softening point of at least 100 ° C, and a petroleum resin selected from alicyclic hydrocarbon resins, unsaturated 5 hydrocarbon resins and isoprene hydrocarbon resins available as commercial products from various manufacturers.

As component C, as mentioned, another relatively low molecular weight polymer compound in an amount of 0-40 parts by weight can optionally be used. Particularly suitable compounds of this type are, for example, polyisobutylene having a molecular weight of 7,000-20,000 and polybutene having a molecular weight of 1,000-10,000.

Preferably, as component C, other additives may be used in an amount of 0-150 parts by weight per minute. 100 parts by weight 15 component A to improve the adhesive and self-adhesive strength of the adhesive. Examples of suitable additives may be mentioned calcium carbonate, zinc oxide, titanium oxide, vegetable oils or modified vegetable oils such as castor oil, rapeseed oil, soybean oil and fact oil, paraffin oil or aromatic process oils, polybutene, liquid polyisobutylene, or polyethylene point blend or polyisobutylene C. The additive must be used in an amount of not more than 150 parts by weight, otherwise a balanced cohesion and self-adhesion will not be achieved, which causes a poor initial high-skewness, so that the "fixed bonding of the bundle is not initially secured.

The liquid additives are used in an amount of no more than 20 parts by weight to achieve balanced adhesive properties.

The adhesive mixture thus prepared is placed on a surface of the support material and dried, then the material is wound into an adhesive tape roll.

The adhesive mixture is usually applied at a layer thickness of 5-30 μνα. (determined in dry state). Prior to application, the carrier film is preferably subjected to a conventional treatment, e.g. by applying a primer layer.

6

DK 153565B

The pressure-sensitive adhesive forms a weak low-polarity adhesive layer 5, however, the adhesive layer has strong adhesive properties on adhesive layers of the same composition. The adhesive tape according to the invention differs from the conventional adhesive tapes, where common rubber or acrylic adhesives are used, with weak adhesiveness and strong self-adhesiveness.

When the adhesive tape according to the invention, which has weak adhesiveness and strong self-adhesiveness, is used for bonding or bundling of vegetables, a secure and stable bundle is not obtained during handling, which means that the vegetables do not slip out of the bundle. Furthermore, there is no danger of the vegetables being damaged when the strip is removed, as the strip does not adhere forcefully to the vegetables. Since the adhesive tape is only provided with adhesive on one side of the adhesive tape, mechanical bonding can be easily and effectively made using an adhesive tape roll, regardless of the size of the bundle to be bonded. Therefore, in the present case, it is not necessary to make strips of different lengths since the adhesive tape according to the invention can be used for bonding different types of goods without the need to use different adhesive tapes. The adhesive tape according to the invention is therefore extremely economical.

When adhesive tape is used to bundle vegetables or flowers, the tape often slips off or is pulled off as the bonded goods expand, e.g. when the vegetables 30 or flowers are cleansed or refreshed by dipping or spraying with water. The adhesive tape must therefore have good creep resistance under constant load to withstand the expansion due to the water absorption of the vegetables.

7

DK 153565B

For the quantitative determination of the properties of the adhesive tape according to the invention, various specific definitions of these properties and methods for measuring them have been introduced.

1. The initial adhesive strength is determined by the strength of the bond of a surface of an edge of a 5 mm diameter metal rod and the surface of the adhesive tape after being contacted for 1 second under a load 10 of 100 g at 20 ° C. and a relative humidity of 65%. The initial adhesive strength is measured as the peel resistance in g, which is obtained by pulling the adhesive tape at a peel rate of 10 mm / s (ASTM Special Technical Publication No. 360).

2. The term "adhesive strength" means the strength obtained when gluing a 20 mm-wide adhesive tape to a stainless steel plate by means of a 2 kg roller and folding back the free surface of the plate surface at an angle of 180 °. The adhesive strength is determined as the peel resistance in g that is obtained by pulling the adhesive tape at a rate of 300 mm / min. (Japanese standard JIS-Z 1522).

3. The adhesive strength is determined by gluing the adhesive sides of a tape with one width of 20 mm and a length of approx. 15 cm in the central areas to a length of 25 mm, with the bonded parts of the tape loaded with a roller weighing 1 kg. The self-adhesive strength is the resistance (in g) which results from pulling off the non-adhesive end of the adhesive tape at an angle of 180 ° at a speed of 30 300 mm / min.

4. The sustained self-adhesive strength is measured by adhering the adhesive surfaces of the adhesive tape of the invention to a width of 20 mm and a length of 15 cm over a length of 25 mm without changing their position;

DK 153565B

on which one free end of the adhesive tape is retained and the resistance is measured by applying a weight of 500 g to the other free end of the adhesive tape, the tape 5 being thus loaded for 1 hour at 20 ° C and a relative humidity of 65 %.

The length drawn (in mm) is an expression of the self-adhesive strength. The adhesive tape according to the invention shows the following properties in these measurements: Table 1

Initial adhesive strength (g / 5 mm diameter): 200-700

Adhesive strength (g / 20 mm width): 100-700

Self-adhesive strength (g / 20 mm width):> 900

Persistent self-adhesive strength (mm / 20 mm.500 g.h): 0-7 15 The corresponding properties are measured for commercially available adhesive tapes, which are especially used for packaging purposes. The results are given in Table 2. 1 i i i 9

DK 153565B

> ~ rH (1) Φ g to · η (D 4-> $ β ό> * * S> 1 ***! ** * tf * * (ϋ 4-1 Ο ^ Λ r- * ^ r-.

β CQ Ο CM Ο CM ι — I I · Γ ~ - CM Ο U3 Ο

β φ ιη (Μ Η ι — ί ι — I ι — I '-' - I CO LOiH

> 43 \ w - - - - - Η -

Ten fB g φ rH g> χ - φ Λ g «g— Η Φ Φ _ _ _ 44 44 Ο >> >> >> 4 4 4 4 4 4 4 4 4 4 4 4> Ο Ο CM CM ο ο οο Φ + J & ϊ Μ · · · · · CQ CO 43 rH γΗ ρ- | γΗ γΗ Η φ 44

U

>) g

«| J ρ / -“ «S

to Φ φ ΟΠ3 ο 43 43 43 CM CM CM 43 cm "β CM * m Ν (i ri i Ο Ο g 00 g \ \ in ^ t ^ -ot ^ or ^ cm r ^ o Η tn β ·« - Λ · “* tr> β

I I - · -H

Φ Φ ti β Φ 43 g Φ +1 β g 4- g 4-> to CM β rH 44 Φ ooooooo oo (tf> ι44 β in g in o oincoM * ooh tn tn> i \ cd co οο η οο οο oom φ Φ Φ Φ 4-) tn-H · 43

43 m to two '-'ϋ H

β tn tr> o β o

• H CO

ti 4J 4J4J4J4J 4-1 4-1.

g φ φ Φ φ Φ Φ · «to ρ> β> β >>> hi r * -sw

β β β β β β β β Μ P ttSP

di h td i — i td i — i fd di <d ή β g 44 M-t 44 14-4 44 m M-t 44 M-4 g &> β β to oomoooooooo ooo oin. ^ Φ φιηιηοοοοοηοοοοο o m in ocog

rH -iH i — i 1 — I I — I I — I Ή Ή 4J

fd H to H ° fd β 44 tQ tfl Φ h Φ CO 44 44 'Η' H φ 4-> -H 44 '-H 44 -H 44 44 Φ g H 43

β CO β Οι β & β β -Hg O

g β -π β -η β -ο -π Η β ΜΗ tn φ 43 tO βΙΟβΙΟβ ΙΟβ Ο 0ι to 44 43 Φ β 4J 43 4-1 43 4-1 Φ 4-1Φ «Η · Η Ή β · Η 0 g Η φβ φβφβ | 3 <ΜΗβθ4ΜΗΐΟ-μ§ ω · π g ο Η Φ rH β · ββ · HββOfdβOHφg td to g cm 44 Md> ι 44 Η44Η44Φ4-) 44Φ4-> W β β 4! +> β a β ο ί-ι ο Μ -i-1 w ίπ 4-ΐ w β φ tn Μ-ι β β tn ,.

tn 0β ΓΰβΌβ> ιΓΟβ> "ΐ, β.βΡΜθβΦιθ .μ Ο β4-> ε / 3β4-1β4-ΐΗΗ44ΗΗΌΦ44 4-1ιΗ4444 & βΗ0β0Φ0> ιΦ0> ιΦβ · Ηω0β · Η φ> i2: tflb2b2;

Pj Η β tn β Η Η 4-1 β 44> ι Ο * · · * ^ φβ> ιφββο 4-J Οι <03 U Q ^ CtJUJCnUZCGg

Td οβ Η CM co pq w - ^ 10

DK 153565B

The invention is further illustrated by the following examples.

Example 1 A non-plasticized polyvinyl chloride film is coated with the adhesive mixture listed in Table 3 below so that the adhesive layer on the adhesive tape after drying has a thickness of 20 (im. The adhesive properties are listed in Table 3 below.

Table 3

Adhesive mixture: SIS 100

Petroleum resin 50

Polyterpene 10 15 CaCO3 10

Mineral and vegetable oils and modified oils 30

Properties:

Initial adhesive strength (g / 5mm diameter) 600 20 Adhesive strength (g / 20 mm) 500

Self-adhesive strength (g / 20 mm) 1500

Persistent self-adhesive strength (mm / 20 mm.500 g.time) 0

Example 2 Various adhesive mixtures of styrene-isoprene-styrene block copolymer (product Cariflex TR 1107 or mixture of products Cariflex TR 1107 and Cariflex TR 1102 from Shell Chemie company) are prepared and various thickening agents. The adhesive mixtures are applied to the base carrier 11

DK 153565B

the material in the usual manner, and the adhesive tapes produced are examined for initial adhesive strength, adhesive strength, self-adhesive strength and persistent self-adhesive strength 5 using the methods described above.

In comparison, adhesives with the composition known from DE Publication No. 2,417,912 are similarly used on the same base carrier material, and the adhesive tapes thus prepared are subjected to the same test.

The adhesive compositions and the results obtained are listed in Table 4 below.

DK 153565B

12

U

CD

> S. „

h IN H O

fij i — i o o o o o - - m σι about cm ο o h m

tn · ID Hl III CO ID

G ΓΗ H G H

tn

H CM

H CN O

p CO O O O o - - <DO 0 r— o o H id S I LO Η I I I 1 I CM ι έ w cti P CO ^ cn o o - - O O O o O H o o in cm I m c—

H HI I

G

CD

m 00 m Γ-J 000 o o - - Φ oincM o o H o t) co Hl I I I 'tf Γ-

G

H

H

ISLAND)

O H CM

OOOO O O - -

φ 00 CM in CM O O CM i I

tn cm I I I 'φ 10 I — 1 s

H

H

u

CD

> 00 · ©. 000 o o - -

M o m CM O O CM H

PM H HI III cd r- (ti ε m o as p r? Η cti ε ^ a ε μ U ^ Μ (ti tu o \ ° CD O> 1

X M o ~ CM -P

rd · Η Γ- 01 P S \ 0)

H & '-AS> 1 ε tn CD

U) P P Η -P A! X! - Λ! > ti iti -P ft cn o - tø t n

I "CM H> 1 X5 CD P CD G CM H

00 GjXj'tJPcti X! CD “N. CD AS O

HH P G H CD rG th -P t n AS H o p Η H cti O P G CD Η <D - P CD m

φ ΐ! Λ ti dJ-rl Mg> 1 M

£ PS PS P> 1 &> H 01 (ti CD + j -P

> iEhEh G AS (ti, G 00 CD -H AS cn CD · H CD 05 O G P '' G W TJ P CD TJ g

OKXOfH O ti ^ H> 1 i G E

P4CD CD p H -P A3> i0 {Dg-Pffi ^

OHH CD O CD PÆ-ri Tig 0) Η P O

ϋ> H Ή P> 1 -P -ti CD G (DA! cti CM

I HH> 1 O -P O G Ai!> Iin A3>> \

^ tGPPHHffiOPO) tn \ (B H ti S

HCtictiOHgOJCDH CD tn H CD CD ε h couugi <: ie w-P m - w co

CD

X) cti · ....

^ c pq H CM co ττ

. DK 153565 B

13 It is clear from the above test results that the known adhesive compositions which do not contain thickener (Comparative Sample 5) or which contain only polyterpene (Comparative Sample 6), give significantly poorer results than the adhesives in question. Thus, the initial adhesive strength with the known adhesive compositions is only approx. half the size, the self-adhesive strength also only approx. half the size, and lastly, the persistent self-adhesive strength is only 10 and 20%, respectively, of the strength obtained with the adhesive in question (the greater the length deducted, the lower the persistent self-adhesive strength). Thus, the known adhesive tapes have substantially different properties than the adhesive tape of the invention and are not suitable for use for the purposes of the invention.

t ·

Claims (3)

Adhesive tape for bundling vegetables or flowers of an adhesive applied to a surface of a water-resistant carrier on the basis of a styrene-containing block copolymer containing a thickening agent, characterized in that the adhesive consists of A) (as a block copolymer) 100 parts by weight of styrene-isoprene. styrene block copolymer or a mixture of styrene-isoprene-styrene block copolymer and styrene-butadiene-styrene block copolymer, B) (as a thickening agent) 5-150 parts by weight of a mixture of polyterpene and a petroleum resin selected from alicyclic hydrocarbon resins , unsaturated hydrocarbon resins and isoprene hydrocarbon resins, C) 0-40 parts by weight of another relatively low molecular weight polymer, and D) 0-150 parts by weight of other additives and the adhesive strength of the adhesive is 100-700 g / 20 mm and 20 the adhesive strength greater than 900 g / 20 mm. Adhesive tape according to claim 1, characterized in that the adhesive contains as additives calcium carbonate, zinc oxide, titanium oxide, vegetable oil, mineral oil, modified plant or mineral oils, paraffin oil and / or 25 aromatic process oils, polybutene and / or liquid polyisobutylene. Adhesive tape according to claim 1, characterized in that the adhesive, as a further relatively low molecular weight polymer compound, contains polyisobutylene having a molecular weight of 7,000 to 20,000 or polybutene having a molecular weight of 1,000 to 10,000.