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CN115582965A - A kind of production method of polypropylene microfoaming film internal paste product for food packaging - Google Patents

A kind of production method of polypropylene microfoaming film internal paste product for food packaging Download PDF

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Publication number
CN115582965A
CN115582965A CN202211237474.9A CN202211237474A CN115582965A CN 115582965 A CN115582965 A CN 115582965A CN 202211237474 A CN202211237474 A CN 202211237474A CN 115582965 A CN115582965 A CN 115582965A
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polypropylene
micro
food packaging
product
injection molding
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CN202211237474.9A
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Chinese (zh)
Inventor
姜春锋
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Tianjin Shenghelihua Technology Co ltd
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Tianjin Shenghelihua Technology Co ltd
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Priority to CN202211237474.9A priority Critical patent/CN115582965A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14688—Coating articles provided with a decoration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/36—Feeding the material to be shaped
    • B29C44/38—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length
    • B29C44/42—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length using pressure difference, e.g. by injection or by vacuum
    • B29C44/424—Details of machines
    • B29C44/425—Valve or nozzle constructions; Details of injection devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0001—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor characterised by the choice of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/20—Injection nozzles
    • B29C45/23—Feed stopping equipment
    • B29C45/234—Valves opened by the pressure of the moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/10—Polymers of propylene
    • B29K2023/12—PP, i.e. polypropylene

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)

Abstract

The invention discloses a production method of a polypropylene micro-foaming film inner paste product for food packaging, which relates to the field of food packaging and comprises the steps of arranging a one-way valve at a material injection nozzle of an injection molding machine, wherein the one-way conduction direction of the one-way valve faces to the material injection direction; adding food-grade micro-foaming master batches into a polypropylene material of an injection molding machine; heating the polypropylene material in the feeding process of the injection molding machine to decompose the food-grade micro-foaming master batches to generate CO2 gas micro-cells; injecting the polypropylene material with the CO2 gas micro-pores into a mold with a membrane inner label through a one-way valve, and enabling the membrane inner label to be attached to the outer surface of the polypropylene material by the aid of the label in the molten membrane of the polypropylene material; waiting for the polypropylene material in the mould to cool and shape to form the food packaging product. The invention improves the heat preservation and heat insulation performance and low-temperature impact resistance of the product.

Description

一种食品包装用聚丙烯微发泡膜内贴产品生产方法A kind of production method of polypropylene microfoaming film internal paste product for food packaging

技术领域technical field

本发明涉及食品包装领域，更具体地说，涉及一种食品包装用聚丙烯微发泡膜内贴产品生产方法。The invention relates to the field of food packaging, and more specifically relates to a production method of a polypropylene microfoam film internally pasted product for food packaging.

背景技术Background technique

聚丙烯膜内贴工艺已经广泛使用在中高端食品包装的产品中，其使用的标签贴合层是聚丙烯，标签贴合层在注塑机注塑聚丙稀时瞬间被熔融的聚丙烯融化，标签在产品冷却后贴合在注塑产品的表面。The polypropylene film inner sticking process has been widely used in high-end food packaging products. The label bonding layer used is polypropylene. The label bonding layer is instantly melted by the molten polypropylene when the injection molding machine injects polypropylene. The label is in After the product is cooled, it is attached to the surface of the injection molded product.

普通聚丙烯膜内贴注塑产品，注塑机注塑产品后，产品的密度一般在0.95kg/m3左右，产品的密度较大，产品保温隔热性能一般。Ordinary polypropylene film is pasted with injection molding products. After the injection molding machine injects the product, the density of the product is generally around 0.95kg/m3. The density of the product is relatively high, and the thermal insulation performance of the product is average.

发明内容Contents of the invention

本发明要解决的技术问题是提供一种食品包装用聚丙烯微发泡膜内贴产品生产方法，以解决背景技术中提到的问题。The technical problem to be solved by the present invention is to provide a production method of a polypropylene microfoam film inner sticker product for food packaging, so as to solve the problems mentioned in the background technology.

为了达到上述目的，本发明采取以下技术方案：In order to achieve the above object, the present invention takes the following technical solutions:

一种食品包装用聚丙烯微发泡膜内贴产品生产方法，包括：A method for producing food packaging polypropylene microfoam film inner sticker products, comprising:

在注塑机的射料嘴处设置单向阀，单向阀的单向导通方向朝向射料方向；A one-way valve is installed at the injection nozzle of the injection molding machine, and the one-way conduction direction of the one-way valve faces the injection direction;

在注塑机的聚丙烯用料中添加食品级微发泡母粒；Add food-grade micro-foaming masterbatches to the polypropylene material of the injection molding machine;

注塑机进料过程中加热聚丙烯用料使食品级微发泡母粒分解产生CO2气体微泡孔；During the feeding process of the injection molding machine, the polypropylene material is heated to decompose the food-grade micro-foaming masterbatch to produce CO2 gas micro-cells;

将带有CO2气体微泡孔的聚丙烯用料通过单向阀注射进入带有膜内贴标签的模具中，聚丙烯用料融化膜内贴标签使膜内贴标签贴附在聚丙烯用料外表面；The polypropylene material with CO2 gas micro-cells is injected into the mold with the label inside the film through the one-way valve, and the polypropylene material melts the label inside the film so that the label inside the film is attached to the outer surface of the polypropylene material;

等待位于模具中的聚丙烯用料冷却定型形成食品包装产品。Wait for the polypropylene material in the mold to cool and set to form a food packaging product.

优选的，所添加的食品级微发泡母粒质量占聚丙烯用料质量的0.5～1.5％。更好的，所添加的食品级微发泡母粒质量占聚丙烯用料质量的1％。Preferably, the added food-grade micro-foaming masterbatch accounts for 0.5-1.5% of the mass of the polypropylene material. Even better, the added food-grade micro-foaming masterbatch accounts for 1% of the mass of the polypropylene material.

优选的，注塑机为螺杆式注塑机。单向阀设置于螺杆式注塑机的螺杆与射料嘴之间。单向阀一端设置有螺杆连接螺纹，另一端设置有射料嘴连接口。单向阀内包括竖直板，竖直板上开设通过口，通过口朝向螺杆的一侧设置推板，通过口朝向蛇料嘴的一侧设置堵板，推板与堵板之间设置弹簧柱，弹簧环绕弹簧柱并位于竖直板与推板之间。Preferably, the injection molding machine is a screw injection molding machine. The one-way valve is arranged between the screw rod and the injection nozzle of the screw type injection molding machine. One end of the one-way valve is provided with a screw connection thread, and the other end is provided with a nozzle connection port. The one-way valve includes a vertical plate with a passage port, a push plate is set on the side of the passage port facing the screw rod, a blocking plate is provided on the side of the passage port facing the snake nozzle, and a spring is arranged between the push plate and the blocking plate The spring surrounds the spring post and is located between the vertical plate and the push plate.

模具为杯状结构。The mold is a cup-shaped structure.

单向阀在本发明中的作用：发泡的熔融料(聚丙烯用料)在注塑机的注塑下射进模具后，在模具内发泡的聚丙烯用料产生的气体开始快速膨胀，导致模具内的压强快速增加，当模具内压强大于注塑喷嘴处的压力时有返流的趋势，而单向阀具有反向截止的功能，模具内的材料在单向阀的反向截止下无法反向回流，保证模具内材料质量和发泡效果的稳定性。The effect of one-way valve in the present invention: after the foamed molten material (polypropylene material) is injected into the mold under the injection molding of the injection molding machine, the gas produced by the foamed polypropylene material in the mold begins to expand rapidly, causing The pressure in the mold increases rapidly. When the pressure in the mold is higher than the pressure at the injection nozzle, there is a tendency of backflow, and the one-way valve has the function of reverse cut-off. The material in the mold cannot be reversed under the reverse cut-off of the one-way valve. To reflow, to ensure the quality of the material in the mold and the stability of the foaming effect.

本发明相对于现有技术的优点在于，现有的普通食品级聚丙烯膜内贴注塑产品的密度在0.95kg/m3左右，产品的密度较大，产品保温隔热性能一般。本发明方法将注塑层进行微发泡后，由于气体增加了产品的体积，产品的密度能够控制在0.5kg/m3左右。同样的产品壁厚，产品克重减少40％左右，降低了材料使用成本，另外增设的单向阀，可以避免用料反流。本发明所生产产品使用微发泡工艺后，产品保温、隔热性能和低温抗冲击性能大幅度增加，产品的物理使用性能大大提高。Compared with the prior art, the present invention has the advantages that the conventional food-grade polypropylene film-laminated injection molding product has a density of about 0.95kg/m3, the product has relatively high density, and the thermal insulation performance of the product is average. After micro-foaming the injection molding layer in the method of the invention, the density of the product can be controlled at about 0.5kg/m3 because the gas increases the volume of the product. With the same product wall thickness, the weight of the product is reduced by about 40%, which reduces the cost of materials used. In addition, the additional one-way valve can avoid the reverse flow of materials. After the product produced by the invention uses the micro-foaming process, the heat preservation, heat insulation performance and low-temperature impact resistance performance of the product are greatly increased, and the physical performance of the product is greatly improved.

附图说明Description of drawings

图1是本发明方法生产处的产品示意图；Fig. 1 is the product schematic diagram of the production place of the inventive method;

图2是图1中的方框A的示意图；Fig. 2 is a schematic diagram of block A in Fig. 1;

图3是本发明所使用的单向阀的示意图。Fig. 3 is a schematic diagram of a one-way valve used in the present invention.

图中，1、聚丙烯用料，2、膜内贴标签，3、弹簧，4、螺杆连接螺纹，5、堵板，6、推板，7、竖直板，8、射料嘴连接口。In the figure, 1. Polypropylene material, 2. Labeling inside the film, 3. Spring, 4. Screw connection thread, 5. Blocking plate, 6. Push plate, 7. Vertical plate, 8. Connection port of injection nozzle.

具体实施方式detailed description

下面结合附图对本发明的具体实施方式作描述。The specific implementation manner of the present invention will be described below in conjunction with the accompanying drawings.

如图1至图3所示，本发明一种食品包装用聚丙烯微发泡膜内贴产品生产方法，包括：As shown in Fig. 1 to Fig. 3, a kind of production method of the present invention uses polypropylene microfoam film to stick product inside, comprises:

在注塑机的射料嘴处设置单向阀，单向阀的单向导通方向朝向射料方向；A one-way valve is installed at the injection nozzle of the injection molding machine, and the one-way conduction direction of the one-way valve faces the injection direction;

在注塑机的聚丙烯用料1中添加食品级微发泡母粒；Add food-grade micro-foaming masterbatches to the polypropylene material 1 of the injection molding machine;

注塑机进料过程中加热聚丙烯用料1使食品级微发泡母粒分解产生CO2气体微泡孔；During the feeding process of the injection molding machine, the polypropylene material 1 is heated to decompose the food-grade micro-foaming masterbatch to produce CO2 gas micro-cells;

将带有CO2气体微泡孔的聚丙烯用料1通过单向阀注射进入带有膜内贴标签2的模具中，聚丙烯用料1融化膜内贴标签2使膜内贴标签2贴附在聚丙烯用料1外表面；The polypropylene material 1 with CO2 gas micro-cells is injected into the mold with the in-film label 2 through the one-way valve, and the polypropylene material 1 melts the in-film label 2 so that the in-film label 2 is attached to the polypropylene Material 1 outer surface;

等待位于模具中的聚丙烯用料1冷却定型形成食品包装产品。Waiting for the polypropylene material 1 in the mold to be cooled and shaped to form a food packaging product.

所添加的食品级微发泡母粒质量占聚丙烯用料1质量的0.5～1.5％。The added food-grade micro-foaming masterbatch accounts for 0.5-1.5% of the mass of the polypropylene material 1.

所添加的食品级微发泡母粒质量占聚丙烯用料1质量的1％。The added food-grade micro-foaming masterbatch accounts for 1% of the mass of polypropylene material 1.

注塑机为螺杆式注塑机。The injection molding machine is a screw type injection molding machine.

单向阀设置于螺杆式注塑机的螺杆与射料嘴之间。The one-way valve is arranged between the screw rod and the injection nozzle of the screw type injection molding machine.

单向阀一端设置有螺杆连接螺纹4，另一端设置有射料嘴连接口8。One end of the check valve is provided with a screw connection thread 4, and the other end is provided with a nozzle connection port 8.

单向阀内包括竖直板7，竖直板7上开设通过口，通过口朝向螺杆的一侧设置推板6，通过口朝向蛇料嘴的一侧设置堵板5，推板6与堵板5之间设置弹簧柱，弹簧3环绕弹簧柱并位于竖直板7与推板6之间。The one-way valve includes a vertical plate 7. A passage port is provided on the vertical plate 7. A push plate 6 is arranged on the side facing the screw rod through the passage port. A blocking plate 5 is arranged on the side facing the snake nozzle through the opening. A spring column is arranged between the plates 5 , and the spring 3 surrounds the spring column and is located between the vertical plate 7 and the push plate 6 .

模具为杯状结构。The mold is a cup-shaped structure.

上述单向阀实施例中，当聚丙烯用料1朝射料嘴方向移动时，聚丙烯用料1会推动推板6移动，推板6压缩弹簧3并推动堵板5移动，堵板5离开通过口，从而聚丙烯用料1得以穿过通过口。若聚丙烯用料1朝反方向移动，则无法通过通过口，因为已经被堵板5堵住。In the above embodiment of the one-way valve, when the polypropylene material 1 moves toward the injection nozzle, the polypropylene material 1 will push the push plate 6 to move, and the push plate 6 compresses the spring 3 and pushes the blocking plate 5 to move, and the blocking plate 5 Leave the passage port, so that the polypropylene material 1 can pass through the passage port. If the polypropylene material 1 moves in the opposite direction, it cannot pass through the passage port because it has been blocked by the blocking plate 5 .

本发明在注塑机射料嘴前端添加单向阀，可确保微发泡材料(聚丙烯用料1)进入模具中继续发泡膨胀时材料不回流。The present invention adds a one-way valve at the front end of the injection nozzle of the injection molding machine, which can ensure that the material does not flow back when the micro-foaming material (polypropylene material 1) enters the mold and continues to foam and expand.

本发明在注塑机的用料中添加1％左右的食品级微发泡母粒(发泡剂)，食品级微发泡母粒在加热的条件下分解并产生CO2气体，CO2气体在螺杆进料的加热过程中均匀地分解成大量的封闭式的微泡孔，其每个微泡孔独立存在，最后通过注塑机射出适量的微发泡聚丙烯(带有CO2气体的聚丙烯用料1)进入有膜内贴标签2的模具中，熔融的微发泡聚丙烯瞬间融化膜内贴标签2的贴合层聚丙烯，同材质相互熔融，产品冷却定型后产生微发泡膜内贴产品。In the present invention, about 1% of food-grade micro-foaming masterbatch (foaming agent) is added to the materials of the injection molding machine, and the food-grade micro-foaming masterbatch decomposes under heating conditions and produces CO2 gas, and CO2 gas enters the screw rod During the heating process of the material, it is evenly decomposed into a large number of closed microcells, each of which exists independently, and finally an appropriate amount of microfoamed polypropylene is injected through the injection molding machine (polypropylene with CO2 gas 1 ) into the mold with the inner film label 2, the molten micro-foamed polypropylene instantly melts the bonding layer polypropylene of the film inner label 2, and the same material melts with each other, and the product is cooled and shaped to produce a micro-foamed film inner product.

现有的普通食品级聚丙烯膜内贴注塑产品的密度在0.95kg/m3左右，产品的密度较大，产品保温隔热性能一般。本发明注塑层进行微发泡后产品的密度能够控制在0.5kg/m3左右，同样的产品壁厚，产品克重减少40％左右，降低材料使用成本。产品使用微发泡工艺后，产品保温、隔热性能和低温抗冲击性能大幅度增加，产品的物理使用性能提高很多。The density of the existing ordinary food-grade polypropylene film-laminated injection molding products is about 0.95kg/m 3 , the density of the product is relatively high, and the thermal insulation performance of the product is average. The density of the product after micro-foaming the injection molding layer of the present invention can be controlled at about 0.5kg/m 3 , and the same product wall thickness can reduce the product weight by about 40%, reducing the cost of material use. After the product uses the micro-foaming process, the heat preservation, heat insulation performance and low-temperature impact resistance of the product are greatly increased, and the physical performance of the product is greatly improved.

以上所述，仅为本发明较佳的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明披露的技术范围内，根据本发明的技术方案及其发明构思加以等同替换或改变，都应涵盖在本发明的保护范围之内。The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone familiar with the technical field within the technical scope disclosed in the present invention, according to the technical solution of the present invention Any equivalent replacement or change of the inventive concepts thereof shall fall within the protection scope of the present invention.

Claims (8)

1. A production method of a polypropylene micro-foaming film inner paste product for food packaging is characterized by comprising the following steps:
a one-way valve is arranged at a material injection nozzle of the injection molding machine, and the one-way conduction direction of the one-way valve faces to the material injection direction;
adding food-grade micro-foaming master batches into a polypropylene material (1) of an injection molding machine;
heating the polypropylene material (1) in the feeding process of an injection molding machine to decompose the food-grade micro-foaming master batches to generate CO2 gas micro-cells;
injecting a polypropylene material (1) with CO2 gas micro-pores into a mold with a membrane inner label (2) through a one-way valve, melting the membrane inner label (2) by the polypropylene material (1) to enable the membrane inner label (2) to be attached to the outer surface of the polypropylene material (1);
waiting for the polypropylene material (1) in the mould to cool and shape to form the food packaging product.
2. The production method of the polypropylene micro-foaming film inner paste product for food packaging according to claim 1, wherein the added food grade micro-foaming master batch accounts for 0.5-1.5% of the polypropylene material (1) by mass.
3. The production method of the polypropylene micro-foaming film inner paste product for food packaging according to claim 2, wherein the added food grade micro-foaming master batch accounts for 1% of the polypropylene material (1) by mass.
4. The method for producing a polypropylene micro-foamed in-film product for food packaging according to claim 1, wherein the injection molding machine is a screw type injection molding machine.
5. The method for producing a polypropylene micro-foamed in-film product for food packaging according to claim 4, wherein the check valve is disposed between a screw of the screw type injection molding machine and the injection nozzle.
6. The method for producing an inner paste product of a polypropylene micro-foam film for food packaging according to claim 5, wherein the check valve is provided with a screw connecting thread (4) at one end and a material injection nozzle connecting port (8) at the other end.
7. The production method of the polypropylene micro-foaming film inner paste product for food packaging according to claim 6, wherein the check valve comprises a vertical plate (7), the vertical plate (7) is provided with a through hole, the through hole is provided with a push plate (6) towards one side of the screw, the through hole is provided with a blocking plate (5) towards one side of the snake-shaped nozzle, a spring column is arranged between the push plate (6) and the blocking plate (5), and a spring (3) surrounds the spring column and is positioned between the vertical plate (7) and the push plate (6).
8. The method for producing a polypropylene micro-foamed film inner liner product for food packaging as claimed in claim 1, wherein the mold is of a cup-like structure.
CN202211237474.9A 2022-10-10 2022-10-10 A kind of production method of polypropylene microfoaming film internal paste product for food packaging Pending CN115582965A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1067607A (en) * 1991-06-08 1993-01-06 谢桂深 Combined anti-backflow and anti-leakage automatic injection nozzle
US20020068769A1 (en) * 2000-12-04 2002-06-06 Franco Bandera Process for the production of expanded polypropylene and end-products based on expanded polypropylene
CN101156192A (en) * 2005-03-30 2008-04-02 优泊公司 Label for in-mold molding and molded product to which the label is applied
CN207758005U (en) * 2018-01-17 2018-08-24 东莞市精泽五金机械有限公司 An injection molding machine easy to disassemble and easy to clean mixing filter nozzle
WO2021175808A1 (en) * 2020-03-03 2021-09-10 Bockatech Ltd Method of forming an article

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1067607A (en) * 1991-06-08 1993-01-06 谢桂深 Combined anti-backflow and anti-leakage automatic injection nozzle
US20020068769A1 (en) * 2000-12-04 2002-06-06 Franco Bandera Process for the production of expanded polypropylene and end-products based on expanded polypropylene
CN101156192A (en) * 2005-03-30 2008-04-02 优泊公司 Label for in-mold molding and molded product to which the label is applied
CN207758005U (en) * 2018-01-17 2018-08-24 东莞市精泽五金机械有限公司 An injection molding machine easy to disassemble and easy to clean mixing filter nozzle
WO2021175808A1 (en) * 2020-03-03 2021-09-10 Bockatech Ltd Method of forming an article

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