CN211994525U

CN211994525U - Multilayer composite POF heat-shrinkable film for packaging

Info

Publication number: CN211994525U
Application number: CN202020315751.3U
Authority: CN
Inventors: 田心平; 赖新民; 赖建民; 黄永志
Original assignee: Great Silver Pack Shenzhen Co ltd
Current assignee: Great Silver Pack Shenzhen Co ltd
Priority date: 2020-03-14
Filing date: 2020-03-14
Publication date: 2020-11-24
Anticipated expiration: 2030-03-14

Abstract

The utility model discloses a compound POF heat shrink film of multilayer for packing, include by outer to interior distributed in proper order: two-layer extexine, six exodermis and two endochite layers, two-layer extexine is terpolymer propylene film, six exodermis includes linear low density alkene copolymer film layer, its characterized in that: the two-layer inner core layer is an ultra-low density alkene copolymer film. Because the ultra-low density vinyl copolymer film with larger viscosity is selected in the two-layer inner core layer, the layer number and the thickness of the film can be increased, and the two-layer film can be bonded together to form a multilayer film with thicker thickness, thereby meeting the requirements of packaging medium and heavy goods.

Description

Multilayer composite POF heat-shrinkable film for packaging

Technical Field

The utility model relates to a packaging material technical field, in particular to compound POF heat shrink film of multilayer for packing.

Background

POF is the meaning of a heat shrinkable film, is called as a multilayer co-extruded polyolefin heat shrinkable film and is formed by plasticizing and extruding linear low-density polyethylene (LLDPE) serving as an intermediate layer and copolymerized propylene (pp) serving as an inner layer and an outer layer by three or five extruders and then carrying out die head molding, bubble inflation and other special processes. The POF is mainly used for packaging products with regular and irregular shapes, and is a replacement product of the traditional PVC heat shrinkable film due to the characteristics of no toxicity, environmental protection, high transparency, high shrinkage, good heat sealing performance, high glossiness, toughness, tear resistance, uniform heat shrinkage, suitability for full-automatic high-speed packaging and the like, and is widely applied to wooden products such as automobile products, plastic products, electronics, circuit boards, MP3, VCD, artware, photo frames and the like, daily necessities, food, cosmetics, canned beverages, dairy products, medicines, cassette tapes, video tapes and the like. There are many methods for forming plastic films, such as calendering, casting, blowing, stretching, and the like.

Because the packaging material is widely used, in the prior art, the product with the thickness of 12-30um is mature in the market, and with the continuous development of the market, higher requirements are put on the thickness and transparency of the film, for example, the multilayer composite film with super thickness (more than 40 um) is researched for medium-heavy packaging, so that the packaging material has urgency.

SUMMERY OF THE UTILITY MODEL

The utility model provides a compound POF heat shrink film of multilayer for packing, its aim at solve the POF heat shrink film on the current market unsuitable problem of medium and heavy article packing usefulness.

The technical scheme of the utility model as follows:

a multilayer composite POF heat-shrinkable film for packaging comprises the following components in sequence from outside to inside: the composite film comprises two outer surface layers, six outer core layers and two inner core layers, wherein the two outer surface layers are terpolymer propylene films, the six outer core layers comprise linear low-density alkene copolymer film layers, and the two inner core layers are ultralow-density alkene copolymer films.

Further: the density of the ultra-low density olefinic copolymer is 0.87-0.90 g/cm for carrying out thin film cultivation.

Further: the thickness of the heat-shrinkable film was 50 um.

Further: the two-layer inner core layer also comprises a tackifying master batch.

Further: the tackifying master batch is polyisobutylene.

The utility model has the advantages of: the utility model provides a pair of compound POF heat shrink film of multilayer for packing is formed by terpolymer propylene film and the coextrusion complex of multilayer thin layer, by outer to interior two-layer extexine, six outer sandwich layers, two in situ sandwich layers that distribute in proper order. Because the ultra-low density vinyl copolymer film with larger viscosity is selected in the two-layer inner core layer, the layer number and the thickness of the film can be increased, and the two-layer film can be bonded together to form a multilayer film with thicker thickness, thereby meeting the requirements of packaging medium and heavy goods.

Drawings

FIG. 1 is a schematic structural view of the multilayer composite POF heat-shrinkable film for packaging.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in figure 1, the utility model provides a compound POF heat shrink film of multilayer for packing forms by ternary polymerization propylene film and multilayer film layer coextrusion complex, including two extexine 1 and 10, six outer sandwich layers 2-4, 7-9 and two inner sandwich layers 5-6 that distribute gradually. Six outer sandwich layers 2-4 and 7-9 are distributed outside two inner sandwich layers 5-6, namely three outer sandwich layers 2-4 and one outer surface layer 1 are arranged in sequence on the first inner sandwich layer 5, and the outer sandwich layer 7-9 and the outer surface layer 10 are arranged below the second inner sandwich layer 6 in sequence.

Specifically, both outer skin layers 1 and 10 are terpolymerized propylene films. The six outer sandwich layers 2-4 and 7-9 comprise linear low-density alkene copolymer film layers, and the two inner sandwich layers 5-6 comprise ultra-low-density alkene copolymer film layers with higher viscosity. Preferably, the material in the six outer core layers 2-4, 7-9 is linear low density ethylene copolymer, and the linear low density ethylene copolymer is preferably any one of ethylene copolymer, propylene copolymer, and blend of ethylene copolymer and propylene copolymer with melting point lower than 130 ℃. Preferably, the density of the ultra-low density vinyl copolymer film layer is preferably 0.87-0.90 g/cm for thin film cultivation.

Preferably, a suitable amount of tackifying master batch can be added to the two inner core layers to make the 10 films more firmly bonded together. The tackifying master batch is divided into aqueous and oily, aqueous tackifying emulsion, aqueous tackifying resin and aqueous tackifying powder, oily tackifying rosin resin and modified rosin resin. The tackifier is mainly used as an adhesive to improve the initial adhesion and the permanent adhesion of the product. In the utility model discloses in, the tackifying master batch is preferred polyisobutene.

Because the ultra-low density vinyl copolymer film layer with higher viscosity is selected from the two inner core layers 5-6 in the production process, the two layers of films can be bonded together to form a multilayer film with thicker thickness. In this embodiment, a film with a thickness of 25um is selected, and the thickness of the film after the compounding is 50um, that is, the total thickness of 10 layers of films is 50um, and the film with a thickness of 40-70um can also be made according to the requirement. Because film thickness is thicker, the packing of relatively being fit for well heavy object is used, the utility model discloses extensive application prospect and high market value have.

The utility model provides a pair of compound POF heat shrink film of multilayer for packing is formed by terpolymer propylene film and the coextrusion complex of multilayer thin layer, two-layer extexine, six outer sandwich layers, two in situ sandwich layers that distribute outside-in. Because the ultra-low density vinyl copolymer film with larger viscosity is selected in the two inner core layers, the thickness of the film can reach 40-70um, thereby meeting the requirements of packaging and bearing of medium and heavy goods.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A multilayer composite POF heat-shrinkable film for packaging comprises the following components in sequence from outside to inside: two-layer extexine, six exodermis and two endochite layers, two-layer extexine is terpolymer propylene film, six exodermis includes linear low density alkene copolymer film layer, its characterized in that: the two-layer inner core layer is an ultra-low density alkene copolymer film.

2. The multi-layer composite POF heat-shrinkable film for packaging according to claim 1, wherein: the density of the ultra-low density olefinic copolymer film is 0.87-0.90 g/cm for thin year.

3. The multi-layer composite POF heat-shrinkable film for packaging according to claim 1, wherein: the thickness of the heat-shrinkable film is 40-70 um.