KR101018350B1 - Method for manufacturing multi-layer film having foamed layer - Google Patents

Method for manufacturing multi-layer film having foamed layer Download PDF

Info

Publication number
KR101018350B1
KR101018350B1 KR1020100096602A KR20100096602A KR101018350B1 KR 101018350 B1 KR101018350 B1 KR 101018350B1 KR 1020100096602 A KR1020100096602 A KR 1020100096602A KR 20100096602 A KR20100096602 A KR 20100096602A KR 101018350 B1 KR101018350 B1 KR 101018350B1
Authority
KR
South Korea
Prior art keywords
layer
foam layer
film
manufacturing
surface layer
Prior art date
Application number
KR1020100096602A
Other languages
Korean (ko)
Inventor
장현봉
Original Assignee
장현봉
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 장현봉 filed Critical 장현봉
Priority to KR1020100096602A priority Critical patent/KR101018350B1/en
Application granted granted Critical
Publication of KR101018350B1 publication Critical patent/KR101018350B1/en
Priority to PCT/KR2011/007043 priority patent/WO2012046968A2/en

Links

Images

Classifications

    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/04—Extrusion blow-moulding
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/11—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels comprising two or more partially or fully enclosed cavities, e.g. honeycomb-shaped
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • B29C48/335—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles
    • B29C48/336—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles the components merging one by one down streams in the die
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • B29C48/335—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles
    • B29C48/336—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles the components merging one by one down streams in the die
    • B29C48/3366—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles the components merging one by one down streams in the die using a die with concentric parts, e.g. rings, cylinders
    • 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
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B29K2023/0608—PE, i.e. polyethylene characterised by its density
    • B29K2023/0633—LDPE, i.e. low density polyethylene
    • 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
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B29K2023/0608—PE, i.e. polyethylene characterised by its density
    • B29K2023/065—HDPE, i.e. high density polyethylene
    • 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
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/0005—Condition, form or state of moulded material or of the material to be shaped containing compounding ingredients
    • B29K2105/0008—Anti-static agents
    • 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
    • B29K2715/00—Condition, form or state of preformed parts, e.g. inserts
    • B29K2715/003—Cellular or porous

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)

Abstract

PURPOSE: A method for manufacturing a multi-layered film having a foam layer is provided to improve the productivity by forming a surface layer and a foam layer with a single extruder and simultaneously laminating them. CONSTITUTION: A method for manufacturing a multi-layered film having a foam layer(1) is as follows. The foam layer absorbing physical impacts is interposed between surface layers(3) located on both side surfaces. Synthetic resin liquid is united and extruded in a single blowing extrusion molding machine so that foaming and lamination are carried out at the same time.

Description

발포층을 포함하는 다층 필름의 제조방법{Method For Manufacturing Multi-Layer Film Having Foamed Layer}Method for manufacturing multi-layer film including foam layer {Method For Manufacturing Multi-Layer Film Having Foamed Layer}

본 발명은 필름의 제조방법에 관한 것으로서, 보다 상세하게는 대전방지, 완충작용 등의 기능을 가진 다층필름의 제조방법에 관한 것이다. The present invention relates to a method for producing a film, and more particularly, to a method for producing a multilayer film having functions such as antistatic and buffering action.

LCD 패널, 고광택 표면재 등과 같이 스크래칭에 민감한 각종의 물품은 조립·생산과정과 운반과정에서 많은 표면손상 위험을 겪게 된다. 따라서 그러한 제품의 표면을 보호하기 위한 보호수단이 사용되는 것이 일반적이며, 합성수지 필름이 그 보호수단으로서 널리 사용되고 있다. 표면 보호용 합성수지 필름을 버퍼필름(또는 버퍼시트)이라고도 하며 통상적으로 발포에 의한 쿠션층을 포함하고 있다. A variety of scratch-sensitive articles, such as LCD panels and high gloss surface materials, are subject to many surface damage risks during assembly, production, and transportation. Therefore, it is common to use a protective means for protecting the surface of such a product, and a synthetic resin film is widely used as the protective means. The surface protective synthetic resin film is also called a buffer film (or buffer sheet), and usually includes a cushion layer by foaming.

그리고 근래 LCD 패널과 같은 민감한 전자부품이 대전되는 것을 방지하는 기능을 가진 표면 보호 필름이 제시되기도 한다. 그러한 기술 중의 하나가 특허출원 제10-2009-0087721호(이하, '종래기술'이라 함)에 개시되어 있다. Recently, surface protection films having a function of preventing charging of sensitive electronic components such as LCD panels have been proposed. One such technique is disclosed in patent application No. 10-2009-0087721 (hereinafter referred to as 'prior art').

위 종래기술에 의하면 도 1에 도시된 바와 같이 발포층(101)을 사이에 두고 그의 양 표면에 대전방지층(103)이 적층되어 있는 구성의 대전 방지용 버퍼시트가 제공된다. 이 버퍼시트는 이전 기술에 비하여 비용이나 기능면에서 만족한 효과를 제공한다. 그러나 종래기술에 의하면 대전방지층(103)의 두께가 20 ~ 40㎛로 예시되고 있다. 또한 제조방법에 있어서, 대전방지층(103)과 발포층(101) 원단을 별도로 생산한 다음 서로를 150℃ 정도의 표면온도를 가지는 압착롤러를 사용하여 열융착시키는 방식이 제시되고 있다. 이러한 제조방법 때문에 대전방지층의 두께가 상기한 바와 같은 정도로 제한될 수밖에 없는 것이다. 대전방지층(103)이 너무 얇은 경우 합지하는 과정에서 장력에 의해 끊어질 수 있기 때문이다. 대전방지층(103)에 사용되는 소재는 특수 소재로서 고가이며 제품의 단가를 결정한다 해도 과언이 아닐 정도이다. 그러므로 대전방지층(103)의 두께를 더 얇게 할 수 있다면 그만큼 버퍼 시트 내지 보호필름의 단가를 낮출 수 있게 될 것이다.According to the prior art, as shown in FIG. 1, an antistatic buffer sheet having a structure in which an antistatic layer 103 is laminated on both surfaces thereof with a foam layer 101 interposed therebetween is provided. This buffer sheet offers a satisfactory effect in terms of cost and function compared to the previous technology. However, according to the prior art, the thickness of the antistatic layer 103 is illustrated as 20 to 40㎛. In addition, in the manufacturing method, a method of separately producing the antistatic layer 103 and the foam layer 101 fabric and then heat-sealing each other using a compression roller having a surface temperature of about 150 ℃. Because of this manufacturing method, the thickness of the antistatic layer is inevitably limited to the extent described above. This is because if the antistatic layer 103 is too thin, it may be broken by tension during lamination. The material used for the antistatic layer 103 is expensive as a special material and it is no exaggeration to determine the unit price of the product. Therefore, if the thickness of the antistatic layer 103 can be made thinner, it will be possible to lower the unit cost of the buffer sheet or the protective film.

또한 합지하는 과정에 사용되는 각종의 장비(압착롤러 등)를 구비하고 운영하기 위해 소요되는 비용이 크게 소요되며, 이 또한 보호필름의 단가를 크게 향상시키는 요인이 된다. In addition, the cost required to equip and operate a variety of equipment (such as a compression roller) used in the process of laminating, and this also greatly increases the cost of the protective film.

또 다른 문제로서는 열과 압력으로 합지하는 과정에서 얇은 대전방지층(103)이 구겨짐으로써 보호필름에 주름이 생기는 경우가 생기기도 한다. 이러한 주름을 가진 보호필름을 판형상의 제품에 사용하는 과정에서 압력(다수의 제품을 적층함에 따라 발생되는 압력)이 가해지게 되면 제품 표면에도 동일한 형태의 자욱이 남는 문제가 발생하기도 한다.
As another problem, wrinkles may occur in the protective film due to wrinkles of the thin antistatic layer 103 during lamination with heat and pressure. If pressure (pressure generated by stacking a plurality of products) is applied in the process of using a protective film having such wrinkles in a plate-shaped product, a problem of leaving the same shape on the surface of the product may occur.

특허출원 제10-2009-0087721호Patent Application No. 10-2009-0087721

위와 같은 문제에 대한 본 발명의 목적은, 대전방지와 같은 기능을 가지는 보호필름을 제공하는 것으로서, 보다 구체적으로는 중간에 1층 이상의 발포층을 포함하여 물리적 충격으로부터 제품을 보호할 수 있으며, 소비자에게 더욱 저렴한 비용으로 제공할 수 있는 보호필름의 제조방법을 제공하는 것에 있다.
An object of the present invention for the above problems, to provide a protective film having a function such as antistatic, more specifically, it can protect the product from physical shocks, including one or more foam layers in the middle, consumers It is to provide a method of manufacturing a protective film that can be provided to a lower cost.

위와 같은 목적은, 물리적 충격을 흡수하게 되는 발포층이 중간에 설치되고 양 표면에는 표면층이 설치되는 합성수지 필름의 제조방법에 있어서; The above object, in the manufacturing method of the synthetic resin film is installed in the middle of the foam layer to absorb the physical impact and the surface layer is installed on both surfaces;

상기 발포층과 표면층은 하나의 압출기 내부에서 액상의 합성수지가 용융상태에서 합체된 후 압출됨으로써 발포와 합지가 동시에 이루어지도록 하는 것을 특징으로 하는, 발포층을 포함하는 다층 필름의 제조방법에 의해 달성된다. The foamed layer and the surface layer is achieved by a method for producing a multilayer film including a foamed layer, characterized in that the foamed and laminated to be made at the same time by the extrusion of the liquid synthetic resin in a molten state in one extruder. .

본 발명의 다른 특징에 의하면, 상기 표면층은 HDPE(High Density Poly Ethylene, 고밀도 폴리에틸렌)일 수 있다. 본 발명의 또 특징에 의하면, 상기 발포층은 LDPE(Low Density Poly Ethylene, 저밀도 폴리에틸렌)일 수 있다. According to another feature of the invention, the surface layer may be HDPE (High Density Poly Ethylene, high density polyethylene). According to another feature of the invention, the foam layer may be Low Density Poly Ethylene (LDPE).

본 발명의 또 다른 특징에 의하면, 상기 발포층은 분리층을 사이에 두고 2개층 이상으로 구성되도록 할 수 있다.
According to another feature of the invention, the foam layer may be composed of two or more layers with a separation layer therebetween.

본 발명에 의하면, 전기적 또는 화학적 기능을 갖는 표면층과 물리적 기능을 가지는 발포층이 하나의 압출기에 의해 생산되는 동시에 합지가 이루어지므로 생산성이 크게 향상된다. 또한 합지를 위한 압착롤러와 같은 장비가 필요 없게 되고, 표면층의 두께를 심지어 1㎛까지 얇게 할 수 있어 생산원가를 크게 낮출 수 있게 된다. 또한 표면층과 발포층이 동시에 생산되므로 사후 합지에 의해 발생되는 제품 결함(예를 들어 잔주름 또는 박리현상)이 없게 된다.
According to the present invention, since the surface layer having an electrical or chemical function and the foam layer having a physical function are produced by one extruder and laminated together, productivity is greatly improved. In addition, there is no need for equipment such as a pressing roller for lamination, and the thickness of the surface layer can be even thinned down to 1 μm, thereby greatly reducing the production cost. In addition, since the surface layer and the foam layer are produced at the same time, there is no product defect (for example, fine wrinkles or peeling) caused by post lamination.

도 1은 종래기술에 의한 대전방지용 버퍼시트의 층단면도이다.
도 2는 본 발명의 실시예에 의한 발포층을 포함하는 다층 필름의 층단면도이다.
도 3은 본 발명의 실시예에 의한 발포층을 포함하는 다층 필름의 제조방법에 사용되는 압출기 금형의 단면 구성도이다.
도 4는 본 발명의 다른 실시예에 의한 발포층을 포함하는 다층 필름의 층단면도이다. 1 is a cross-sectional view of a layer of an antistatic buffer sheet according to the prior art.
2 is a cross-sectional view of a multilayer film including a foam layer according to an embodiment of the present invention.
3 is a cross-sectional configuration diagram of an extruder mold used in the method for producing a multilayer film including a foam layer according to an embodiment of the present invention.
4 is a cross-sectional view of a multilayer film including a foam layer according to another embodiment of the present invention.

이하, 첨부된 도면을 참조하여 본 발명의 실시예를 구체적으로 설명한다. 본 발명은 도 2 또는 도 4의 단면도에 나타난 층구조를 갖는 필름을 제조하는 방법에 관한 것이다. 도 2는 3개의 층구조를, 도 4는 5개의 층구조를 가진다. 공통적인 것은 중간에 발포층(1)이 설치된다는 것과 양 표면에 소정의 기능을 갖는 표면층(3)이 설치된다는 것이다. 표면층(3)의 대표적인 예로는 대전방지제가 함유되어 있음으로써 대전방지 기능을 갖게 하는 대전방지층이다.
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention relates to a method for producing a film having a layer structure shown in the cross-sectional view of FIG. Figure 2 has a three layer structure, Figure 4 has a five layer structure. What is common is that the foam layer 1 is provided in the middle, and the surface layer 3 having a predetermined function is provided on both surfaces. A representative example of the surface layer 3 is an antistatic layer which has an antistatic function by containing an antistatic agent.

발포층(1)은 다수의 미세한 기포(5)를 가짐으로써 물리적 충격을 흡수하게 한다. 발포층(1)의 두께 및 기포의 평균크기는 제품의 구체적 용도에 따라 달라지며 소비자의 요구에 맞게 다양하게 제공될 수 있다. The foam layer 1 has a number of fine bubbles 5 to absorb physical shocks. The thickness of the foam layer 1 and the average size of the bubbles depend on the specific use of the product and can be provided in various ways to meet the needs of the consumer.

표면층(3)은 HDPE(High Density Poly Ethylene, 고밀도 폴리에틸렌)가 사용되는 것이 바람직한데, 경도가 높아 스크래칭에 대한 대응력을 높일 수 있다. Surface layer 3 is preferably used HDPE (High Density Poly Ethylene, high density polyethylene), the hardness is high, it is possible to increase the response to scratching.

발포층(1)은 LDPE(Low Density Poly Ethylene, 저밀도 폴리에틸렌)일 수 있다. 이는 연성이 높아 발포가 쉽게 이루어지도록 한다. The foam layer 1 may be Low Density Poly Ethylene (LDPE). It is high in ductility to facilitate foaming.

재질에 있어서 표면층(3)과 발포층(1)은 폴리에틸렌 이외에도 폴리올레핀계 고분자화합물중 어느 것을 필요에 따라 선택하여 사용할 수 있다. In the material, the surface layer 3 and the foamed layer 1 may be selected and used as required from any of polyolefin-based polymer compounds in addition to polyethylene.

또한, 표면층에 대전방지 기능을 부여하기 위한 수단으로서의 대전방지제가 첨가될 수 있는데 이는 종래기술에 의해 알려진 소재중 임의의 것을 취사선택할 수 있다. In addition, an antistatic agent may be added as a means for imparting an antistatic function to the surface layer, which can be selected from any of the materials known in the art.

본 발명의 핵심은 발포층(1)과 표면층(3)이 하나의 압출기만에 의해 완전한 제품으로 생산되도록 하는 방법에 있다. At the heart of the present invention is a method in which the foam layer 1 and the surface layer 3 are produced as a complete product by only one extruder.

압출기는 제품을 튜브 형태로 압출하는 원형 다이스 형식 또는 시트 형태로 압출하는 티 다이스 형식중 어느 하나가 선택적으로 이용될 수 있다. 도 3에 도시된 바에 의하면 원형 다이스 형식의 압출기 선단에 설치되는 금형(7)의 내부 구조를 도시한다. The extruder may optionally use either a circular die form for extruding the product in the form of a tube or a tee die form for extruding in the form of a sheet. 3 shows the internal structure of the die 7 installed at the tip of the extruder in the form of a circular die.

용융된 표면층수지액은 제1,2홀(9,11)을 통해 유입되어 제1,2유입관(13,15)을 따라 금형(7)의 선단(7a)으로 압송되며, 가스를 함유한 용융상태의 발포층수지액은 제3홀(17)을 통해 유입되어 제3유입관(19)을 따라 금형의 선단(7a)으로 압송된다. The molten surface layer resin liquid flows through the first and second holes 9 and 11 and is pumped along the first and second inlet pipes 13 and 15 to the tip 7a of the mold 7 and contains gas. The foamed layer resin solution in the molten state is introduced through the third hole 17 and is pumped along the third inlet pipe 19 to the tip 7a of the mold.

제1,2유입관(13,15)과 제3유입관(19)은 금형의 선단에 인접한 합류지점(J)에서 순차적으로 합류하게 된다. The first and second inflow pipes 13 and 15 and the third inflow pipe 19 are sequentially joined at the joining point J adjacent to the tip of the mold.

압축공기는 제4홀(21)을 통해 유입되어 제4유입관(23)으로 압송되고 금형 선단의 중앙부위에서 분출된다. 압축공기의 압력에 의해 미세한 틈으로 된 환형의 수지분출홀(25)에서 압출되는 혼합수지는 확장되면서 튜브 형태가 된다. Compressed air flows through the fourth hole 21 and is pumped into the fourth inlet pipe 23 and ejected from the center portion of the mold tip. Due to the pressure of the compressed air, the mixed resin extruded from the annular resin ejection hole 25 into a fine gap is expanded into a tube shape.

본 발명에 의하면 금형(7) 내부에서 액상의 합성수지가 용융상태에서 합체된 후 압출됨으로써 발포와 합지가 동시에 이루어지게 된다. 충분한 압력을 갖고 저속으로 유동되는 용융수지는 금형 내에서 합류된 다음에도 혼합되지 않고 층구조를 이루면서 수지분출홀(25)까지 압송되게 된다. 다만 합류지점(J)에서 금형 선단에 위치하는 수지분출홀(25)까지의 거리(L)는 중요한 요소가 될 수 있는데, 너무 길면 수지액이 섞여 층구조를 잃어버릴 수도 있다. According to the present invention, the foamed resin and the lamination are made at the same time by being extruded after the liquid synthetic resin is coalesced in the molten state in the mold 7. The molten resin that flows at a low speed with sufficient pressure will be conveyed to the resin ejection hole 25 while forming a layered structure without being mixed even after joining in the mold. However, the distance (L) from the joining point (J) to the resin ejection hole 25 located at the tip of the mold may be an important factor. If it is too long, the resin liquid may be mixed and the layer structure may be lost.

그러므로 층구조를 유지하며 분출되는 조건을 유지할 수 있게끔 압출기 스크류의 토크, 회전속도, 수지의 압력, 온도 등을 결정하여야 할 것이며, 이는 숙련도를 가진 작업자의 경험에 의해 어렵지 않게 이루어질 수 있을 것이다. Therefore, it is necessary to determine the torque, rotation speed, resin pressure, temperature, etc. of the extruder screw so as to maintain the layer structure and maintain the ejecting conditions, which can be easily achieved by the experience of a skilled worker.

도 3에 도시된 금형 이외에 통상의 압출기와 같이 수지공급부, 가열부, 발포층을 형성하기 위한 수지와 가스의 혼합부, 압출스크류가 설치되는 압력발생부 등이 본 발명의 실시를 위한 압출기에 더 포함됨은 물론이다. 참고로 본 발명의 실시예에 의하면 발포층의 기포(5)를 형성하기 위하여 부탄가스 또는 공기가 사용될 수 있다. In addition to the mold illustrated in FIG. 3, the resin supply unit, the heating unit, the mixing unit of the resin and gas for forming the foam layer, the pressure generating unit in which the extrusion screw is installed, and the like are provided in the extruder for carrying out the present invention. Of course included. For reference, butane gas or air may be used to form the bubble 5 of the foam layer according to the embodiment of the present invention.

도 4는 본 발명의 다른 실시예에 의한 다층 필름의 층구조이다. 도 5는 도 4의 층구조를 갖는 필름의 제작을 위한 금형의 개략 단면도이다. 본 실시예에 의하면 발포층은 제1발포층(1a)과 제2발포층(1b)과 같은 복수의 층구조를 가진다. 그리고 제1발포층(1a)과 제2발포층(1b) 사이에는 박막의 형태를 가지는 분리층(27)이 개입된다. 이러한 구성은 완충작용을 강화시키기 위한 방법으로 채용되는 것이다. 사용자는 필요에 따라 압출기 금형의 구조를 변형함으로써 총 도 4와 같이 5개층이 아닌 7개층 또는 그 이상의 층구조를 가진 필름도 제작할 수 있다. 분리층(27)의 두께는 1 ~ 10㎛가 적당하며, 가급적이면 발포층(1)을 구성하는 합성수지와 같은 종류의 것을 사용하는 것이 제품의 일체성을 유지하기 위해 바람직하다. 4 is a layer structure of a multilayer film according to another embodiment of the present invention. FIG. 5 is a schematic cross-sectional view of a mold for producing a film having the layer structure of FIG. 4. FIG. According to the present embodiment, the foam layer has a plurality of layer structures such as the first foam layer 1a and the second foam layer 1b. In addition, a separation layer 27 having a form of a thin film is interposed between the first foaming layer 1a and the second foaming layer 1b. This configuration is employed as a method for enhancing the buffer action. By modifying the structure of the extruder mold as needed, the user can also produce a film having seven or more layers instead of five layers as shown in FIG. 4. The thickness of the separation layer 27 is suitably 1 to 10 µm, and preferably, the same kind of synthetic resin as the foam layer 1 is used to maintain the integrity of the product.

도 5에 도시된 압출기용 금형은 도 4와 같은 5개의 층구조를 갖는 필름(F)을 제작할 수 있게 한다. 각각의 유입홀(H)과 유입관(P)을 통해 서로 다른 물성을 갖는 용융 합성수지가 유입되어 합류된 다음 금형 선단의 분출공(T)을 통해 압출된다.
The mold for the extruder shown in FIG. 5 makes it possible to produce a film F having a five layer structure as shown in FIG. 4. Through each of the inlet hole (H) and the inlet pipe (P), the molten synthetic resin having different physical properties are introduced and joined, and then extruded through the ejection hole (T) of the mold tip.

이상에서는 표면층(3)이 가질 수 있는 기능중 대전방지 기능을 위주로 하여 설명하였지만, 대전방지 기능 이외에도 다양한 기능이 표면층(3)에 부여될 수 있다.
In the above, the description has been given based on the antistatic function among the functions that the surface layer 3 may have. However, various functions may be provided to the surface layer 3 in addition to the antistatic function.

본 발명에 의하면 표면층(3)의 두께를 종래의 것에 비해 상당한 정도로 얇게 할 수가 있게 된다. 예를 들어 1㎛까지도 얇게 할 수가 있는데 이렇게 되면 고가의 표면층(3)을 적게 사용하여도 되므로 전체적으로 필름의 단가를 낮출 수 있게 되는 것이다. 또한 발포층(1)과 표면층(3)의 접착력을 향상시켜 마치 일체화된 것과 같은 효과를 얻을 수 있으며 표면층(3)의 합지시에 발생되는 주름이 없어 제품의 외관이 향상되게 된다. According to the present invention, the thickness of the surface layer 3 can be reduced to a considerable extent as compared with the conventional one. For example, it can be thinned up to 1㎛, but this can reduce the cost of the film as a whole can be used less expensive surface layer (3). In addition, by improving the adhesion between the foam layer (1) and the surface layer (3) can be obtained as if the effect is integrated, there is no wrinkles generated during the lamination of the surface layer (3) improves the appearance of the product.

한편 발포층(1)의 두께 및 밀도는 제품의 용도에 따라 다양하게 조정될 수 있다. 예를 들어 발포층(1)의 두께가 0.5mm ~ 100mm가 될 수도 있다. Meanwhile, the thickness and density of the foam layer 1 may be adjusted in various ways according to the use of the product. For example, the thickness of the foam layer 1 may be 0.5 mm to 100 mm.

본 발명의 또 다른 실시예에 의하면 표면층과 발포층 사이에 도 6에 도시된 바와 같은 중간층(29)이 더 개입될 수도 있다. 중간층(29)은 표면층(3)과 발포층(1)을 매개하는 합성수지층이다. 이는 제품의 용도에 따라 표면층에 근접한 물성을 갖는 소재를 사용하거나 발포층에 근접한 소재를 사용하면 될 것이다.
According to another embodiment of the present invention, an intermediate layer 29 as shown in FIG. 6 may be further interposed between the surface layer and the foam layer. The intermediate layer 29 is a synthetic resin layer which mediates the surface layer 3 and the foam layer 1. This may be achieved by using materials close to the surface layer or materials close to the foam layer, depending on the intended use of the product.

본 발명에 있어서 필름은 그의 두께가 100mm가 될 수도 있어서 필름이란 용어가 적절하지 않게 생각될 수도 있다. 그러므로 통상적으로 사용되는 필름이란 용어에 의해 본 발명의 권리범위를 제한해서는 아니 된다. In the present invention, the film may have a thickness of 100 mm, and the term film may be considered to be inappropriate. Therefore, the scope of the present invention should not be limited by the term film which is commonly used.

종래기술에 의하면 발포층을 포함한 다층 필름(또는 시트)을 두껍게 하기 위해서는 몇겹을 접착시켜야 했으며 롤러를 사용하여야 했기 때문에 그 두께를 늘리는 것에도 많은 제한이 따랐다(예를 들어 5mm 정도가 최대로 만들 수 있는 두께였다). 그러나 본 발명의 제조방법에 의하면 발포층을 포함하는 다층 필름의 두께에 거의 제한을 받지 않게 된다. 발포층에 포함되는 가스의 양을 조절함으로써 두께 조절이 극히 용이하게 되기 때문이다. 그래서 매우 다양한 용도의 제품이 생산될 수 있는 것이다.
According to the prior art, in order to thicken a multi-layer film (or sheet) including a foam layer, many layers have to be bonded and rollers have to be used to increase the thickness, and many restrictions have been imposed (for example, 5 mm can be maximized). That was thick). However, according to the manufacturing method of the present invention, the thickness of the multilayer film including the foam layer is hardly limited. It is because thickness control becomes extremely easy by adjusting the quantity of gas contained in a foam layer. So a wide variety of products can be produced.

1 ; 발포층 3 ; 표면층
5 ; 기포 7 ; 금형
27 ; 분리층 29 ; 중간층One ; Foam layer 3; Surface layer
5; Bubble 7; mold
27; Separation layer 29; Mezzanine

Claims (5)

물리적 충격을 흡수하게 되는 발포층이 중간에 설치되고 양 표면에는 표면층이 설치되는 합성수지 필름의 제조방법에 있어서;
상기 발포층과 표면층은 하나의 블로우 압출 성형기 내부에서 액상의 합성수지가 용융상태에서 합체된 후 압출됨으로써 발포와 합지가 동시에 이루어지도록 하는 것을 특징으로 하는, 발포층을 포함하는 다층 필름의 제조방법. In the manufacturing method of the synthetic resin film is provided with a foam layer to absorb the physical impact in the middle and the surface layer is provided on both surfaces;
The foam layer and the surface layer is characterized in that the foamed and laminated to be made at the same time by the extrusion of the liquid synthetic resin in a molten state in a blow extrusion molding machine, characterized in that at the same time, the manufacturing method of a multi-layer film comprising a foam layer. 삭제delete 제1항에 있어서, 상기 표면층은 HDPE(High Density Poly Ethylene, 고밀도 폴리에틸렌)이고; 상기 발포층은 LDPE(Low Density Poly Ethylene, 저밀도 폴리에틸렌)인 것을 특징으로 하는 발포층을 포함하는 다층 필름의 제조방법.The method of claim 1, wherein the surface layer is HDPE (High Density Poly Ethylene); The foam layer is a manufacturing method of a multilayer film comprising a foam layer, characterized in that low density poly ethylene, low density polyethylene (LDPE). 제1항에 있어서, 상기 발포층은 분리층을 사이에 두고 2개층 이상으로 구성되도록 하는 것을 특징으로 하는 발포층을 포함하는 다층 필름의 제조방법. The method of claim 1, wherein the foam layer comprises at least two layers with a separation layer interposed therebetween. 제1항에 있어서, 대전방지 기능을 위해 상기 표면층에 대전방지제를 포함시키는 것을 특징으로 하는 발포층을 포함하는 다층 필름의 제조방법. The method of claim 1, wherein an antistatic agent is included in the surface layer for an antistatic function.
KR1020100096602A 2010-10-05 2010-10-05 Method for manufacturing multi-layer film having foamed layer KR101018350B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020100096602A KR101018350B1 (en) 2010-10-05 2010-10-05 Method for manufacturing multi-layer film having foamed layer
PCT/KR2011/007043 WO2012046968A2 (en) 2010-10-05 2011-09-26 Method of manufacturing a multi-layer film including a foaming layer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020100096602A KR101018350B1 (en) 2010-10-05 2010-10-05 Method for manufacturing multi-layer film having foamed layer

Publications (1)

Publication Number Publication Date
KR101018350B1 true KR101018350B1 (en) 2011-03-04

Family

ID=43938222

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020100096602A KR101018350B1 (en) 2010-10-05 2010-10-05 Method for manufacturing multi-layer film having foamed layer

Country Status (2)

Country Link
KR (1) KR101018350B1 (en)
WO (1) WO2012046968A2 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001113585A (en) 1999-08-12 2001-04-24 Sumitomo Chem Co Ltd Method of manufacturing foamed laminate
JP2001347589A (en) 2000-06-09 2001-12-18 Japan Polychem Corp Thermoplastic resin foamed laminated sheet
JP2004291623A (en) * 2003-03-12 2004-10-21 Sumitomo Chem Co Ltd Multi-layered foamed sheet of propylene type resin
KR20100019967A (en) * 2008-08-11 2010-02-19 가부시키가이샤 제이에스피 Polyolefin resin laminated foam

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001113585A (en) 1999-08-12 2001-04-24 Sumitomo Chem Co Ltd Method of manufacturing foamed laminate
JP2001347589A (en) 2000-06-09 2001-12-18 Japan Polychem Corp Thermoplastic resin foamed laminated sheet
JP2004291623A (en) * 2003-03-12 2004-10-21 Sumitomo Chem Co Ltd Multi-layered foamed sheet of propylene type resin
KR20100019967A (en) * 2008-08-11 2010-02-19 가부시키가이샤 제이에스피 Polyolefin resin laminated foam

Also Published As

Publication number Publication date
WO2012046968A3 (en) 2012-06-14
WO2012046968A2 (en) 2012-04-12

Similar Documents

Publication Publication Date Title
US9481143B2 (en) Multilayer structures having annular profiles
JP2007535424A (en) Method and apparatus for producing blister sheet
JP2007535424A5 (en)
US20100112335A1 (en) Laminated film or sheet having a foamed resin layer and process for producing the same
JP2019513097A (en) Foldable honeycomb structure and method of manufacturing the same
CN104401076A (en) HDPE(high-density polyethylene) membrane composited by high foaming of LDPE(Low-Density Polyethylene) and preparation method of HDPE membrane
CN102765190B (en) Method for producing biaxially oriented multilayer co-extruded polyolefin shrink film by flat film process
US20160059514A1 (en) Plastic film laminate
Souza et al. Thermoformable high oxygen barrier multilayer EVOH/LDPE film/foam
JP5934355B2 (en) Method for producing polyolefin-based stretched film and polyolefin-based stretched film produced by the method
KR101018350B1 (en) Method for manufacturing multi-layer film having foamed layer
HRP20210760T1 (en) A lighter-than-air vehicle with a hull, a laminate for such hull and a method of production of such laminate
EA038351B1 (en) Honeycomb sandwich sheet or panel, based on polypropylene, with central thermoformed films
KR20180016572A (en) Polypropylene-based honeycomb sandwich sheets or panels with a center thermoforming film
KR101357147B1 (en) Multi-functional composite films consisting of meter for volume expansion absorbing member and a method for manufacturing the same
JP3109649U (en) Coextrusion multilayer foam composite board
JP2023015849A (en) Laminate for vacuum heat insulation material outer package
KR101357151B1 (en) Barrier composite films sex with cortical re-frost-proof water meters, and volume expansion absorbing material and its manufacturing method
KR20120108216A (en) A manufacturing method of optical multilayer sheet for display
KR20110082490A (en) A polyethylen protection sheet for panel
KR102574372B1 (en) Co-extruded eco-friendly foam multilayer film and ice pack using the same
JPS62174131A (en) Manufacture of trim
CN205615118U (en) CPP five -layer co -extrusion curtain coating biaxial stretching film
WO2023077500A1 (en) Mdo barrier film, package laminates containing the same, and methods of making the same
CN205615119U (en) CPP five -layer co -extrusion curtain coating biaxial stretching film

Legal Events

Date Code Title Description
A201 Request for examination
A302 Request for accelerated examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20140217

Year of fee payment: 4

FPAY Annual fee payment

Payment date: 20150216

Year of fee payment: 5

FPAY Annual fee payment

Payment date: 20160218

Year of fee payment: 6

FPAY Annual fee payment

Payment date: 20170309

Year of fee payment: 7

LAPS Lapse due to unpaid annual fee