Ultra heat treated (UHT) liquid milk packaging film of multilayer plastic composite structure and preparation method thereof

Abstract

The invention discloses an ultra heat treated (UHT) liquid milk packaging film of a multilayer plastic composite structure and a preparation method thereof. The UHT liquid milk packaging film comprises a co-extrusion gray film which sequentially comprises a first developing layer, a first bonding layer, a fresh-keeping separating layer, a second bonding layer, a light isolating layer and a heat seal layer, wherein the heat seal layer is a polyethylene film layer containing white masterbatch. The preparation method comprises the steps of carrying out co-extrusion and film blowing on the co-extrusion gray film based on the structure of the UHT liquid milk packaging film, and compounding the co-extrusion gray film with a printing film when a printing film is contained. In comparison with the conventional black inner layer, the UHT liquid milk packaging film ensures that peculiar smell in the liquid milk after stored for a long time can be reduced, the plastic smell is light, the special flavor of material milk is low in loss, and special flavor and mouth feeling of material milk can be kept.

Description

technical field

[0001] The invention relates to a liquid milk packaging film, in particular to a UHT liquid milk packaging film with a multilayer plastic composite structure and a preparation method thereof. Background technique

[0002] At present, the plastic packaging of UHT (Ultra High Temperature treated, ultra-high temperature instantaneous treatment) liquid milk is a multi-layer plastic composite structure packaging film (commonly known as milk film), mainly using two types: co-extrusion barrier five-layer black and white milk film and Coating and blocking three layers of black and white milk film, in which black masterbatch is added to the light-shielding heat-sealing layer of polyethylene material that is located on the innermost side of the milk film and is in contact with liquid milk.

[0003] Among them, the co-extrusion barrier five-layer black and white milk film sequentially includes the first color-developing layer, the first adhesive layer, the fresh-keeping...

Examples

Embodiment 1

[0045] Such as figure 1 As shown, the UHT liquid milk packaging film of multi-layer plastic composite structure in this embodiment includes a co-extruded off-white film layer 2, and the co-extruded off-white film layer 2 sequentially includes a first color-developing layer 201, a second color-developing layer 202, The first adhesive layer 203 , the fresh-keeping barrier layer 204 , the second adhesive layer 205 , the light-shielding layer 206 , and the heat-sealing layer 207 .

[0046] The UHT liquid milk packaging film of this embodiment further includes a printed film layer 1 , a printed ink layer 3 and a third adhesive layer 4 in sequence.

[0047] The printing ink layer 3 and the third adhesive layer 4 are located between the printing film layer 1 and the first color-developing layer 201 of the co-extruded off-white film layer 2, the third adhesive layer 4 and the co-extruded off-white film Layers of the first color-developing layer 201 are connected. The printing ink la...

Embodiment 2

[0064] The UHT liquid milk packaging film of the multilayer plastic composite structure in the present embodiment co-extrudes the off-white film layer 2 and embodiment 1, and its difference is:

[0065] The material of the third adhesive layer 4 is low density polyethylene (LDPE) resin.

[0066] Correspondingly, the compounding in the step (3) of the specific manufacturing method is that the printed film layer 1 is extruded and compounded with the co-extruded gray-white film layer 2 through the third adhesive layer 4 .

[0067] In this embodiment, the thickness of the printing film layer 1 is 20 μm. The thickness of the co-extruded gray-white film layer 2 is 70 μm.

Embodiment 3

[0069] The difference between this embodiment and Embodiment 2 is that the thickness of the printed film layer in this embodiment is 25 μm. The thickness of the co-extruded gray-white film layer is 80 μm. The thickness of the fresh-keeping barrier layer is 10 μm.

technical field

[0001] The invention relates to a liquid milk packaging film, in particular to a UHT liquid milk packaging film with a multilayer plastic composite structure and a preparation method thereof. Background technique

[0002] At present, the plastic packaging of UHT (Ultra High Temperature treated, ultra-high temperature instantaneous treatment) liquid milk is a multi-layer plastic composite structure packaging film (commonly known as milk film), mainly using two types: co-extrusion barrier five-layer black and white milk film and Coating and blocking three layers of black and white milk film, in which black masterbatch is added to the light-shielding heat-sealing layer of polyethylene material that is located on the innermost side of the milk film and is in contact with liquid milk.

[0003] Among them, the co-extrusion barrier five-layer black and white milk film sequentially includes the first color-developing layer, the first adhesive layer, the fresh-keeping...

Examples

Embodiment 1

[0045] Such as figure 1 As shown, the UHT liquid milk packaging film of multi-layer plastic composite structure in this embodiment includes a co-extruded off-white film layer 2, and the co-extruded off-white film layer 2 sequentially includes a first color-developing layer 201, a second color-developing layer 202, The first adhesive layer 203 , the fresh-keeping barrier layer 204 , the second adhesive layer 205 , the light-shielding layer 206 , and the heat-sealing layer 207 .

[0046] The UHT liquid milk packaging film of this embodiment further includes a printed film layer 1 , a printed ink layer 3 and a third adhesive layer 4 in sequence.

[0047] The printing ink layer 3 and the third adhesive layer 4 are located between the printing film layer 1 and the first color-developing layer 201 of the co-extruded off-white film layer 2, the third adhesive layer 4 and the co-extruded off-white film Layers of the first color-developing layer 201 are connected. The printing ink la...

Embodiment 2

[0064] The UHT liquid milk packaging film of the multilayer plastic composite structure in the present embodiment co-extrudes the off-white film layer 2 and embodiment 1, and its difference is:

[0065] The material of the third adhesive layer 4 is low density polyethylene (LDPE) resin.

[0066] Correspondingly, the compounding in the step (3) of the specific manufacturing method is that the printed film layer 1 is extruded and compounded with the co-extruded gray-white film layer 2 through the third adhesive layer 4 .

[0067] In this embodiment, the thickness of the printing film layer 1 is 20 μm. The thickness of the co-extruded gray-white film layer 2 is 70 μm.

Embodiment 3

[0069] The difference between this embodiment and Embodiment 2 is that the thickness of the printed film layer in this embodiment is 25 μm. The thickness of the co-extruded gray-white film layer is 80 μm. The thickness of the fresh-keeping barrier layer is 10 μm.

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